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Kumar A, Singh P, Nguyen VH, Le QV, Ahamad T, Thakur S, Matsagar BM, Kaya S, Maslov MM, Wu KCW, Nguyen LH, Raizada P. DFT and experimental studies of the facet-dependent oxygen vacancies modulated WS 2/BiOCl-OV S-scheme structure for enhanced photocatalytic removal of ciprofloxacin from wastewater. Environ Res 2024; 250:118519. [PMID: 38382660 DOI: 10.1016/j.envres.2024.118519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2024] [Revised: 02/09/2024] [Accepted: 02/17/2024] [Indexed: 02/23/2024]
Abstract
The present study explores visible light-assisted photodegradation of ciprofloxacin hydrochloride (CIP) antibiotic as a promising solution to water pollution. The focus is on transforming the optical and electronic properties of BiOCl through the generation of oxygen vacancies (OVs) and the exposure of (110) facets, forming a robust S-scheme heterojunction with WS2. The resultant OVs mediated composite with an optimal ratio of WS2 and BiOCl-OV (4-WS2/BiOCl-OV) demonstrated remarkable efficiency (94.3%) in the visible light-assisted photodegradation of CIP antibiotic within 1.5 h. The CIP degradation using 4-WS2/BiOCl-OV followed pseudo-first-order kinetics with the rate constant of 0.023 min-1, outperforming bare WS2, BiOCl, and BiOCl-OV by 8, 6, and 4 times, respectively. Density functional theory (DFT) analysis aligned well with experimental results, providing insights into the structural arrangement and bandgap analysis of the photocatalysts. Liquid chromatography-mass spectrometry (LC-MS) analysis utilized for identifying potentially degraded products while scavenging experiments and electron paramagnetic resonance (EPR) spin trapping analysis elucidated the S-scheme charge transfer mechanism. This research contributes to advancing the design of oxygen vacancy-mediated S-scheme systems in the realm of photocatalysis, with potential implications for addressing water pollution concerns.
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Affiliation(s)
- Abhinandan Kumar
- School of Advanced Chemical Sciences, Shoolini University, Solan, Himachal Pradesh, 173212, India
| | - Pardeep Singh
- School of Advanced Chemical Sciences, Shoolini University, Solan, Himachal Pradesh, 173212, India
| | - Van-Huy Nguyen
- Centre for Herbal Pharmacology and Environmental Sustainability, Chettinad Hospital and Research Institute, Chettinad Academy of Research and Education, Kelambakkam, 603103, Tamil Nadu, India.
| | - Quyet Van Le
- Department of Materials Science and Engineering, Korea University, 145, Anamro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Tansir Ahamad
- Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Sourbh Thakur
- Department of Organic Chemistry, Bioorganic Chemistry and Biotechnology, Silesian University of Technology, B. Krzywoustego 4, 44-100, Gliwice, Poland
| | - Babasaheb M Matsagar
- Department of Chemical Engineering, National Taiwan University (NTU), No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
| | - Savas Kaya
- Department of Chemistry, Faculty of Science, Sivas Cumhuriyet University, 58140, Sivas, Turkey
| | - Mikhail M Maslov
- Nanoengineering in Electronics, Spintronics and Photonics Institute, National Research Nuclear University "MEPhI", Kashirskoe Shosse 31, Moscow, 115409, Russia
| | - Kevin C-W Wu
- Department of Chemical Engineering, National Taiwan University (NTU), No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
| | - Lan Huong Nguyen
- Faculty of Biology and Environment, Ho Chi Minh City University of Industry and Trade (HUIT), 140 Le Trong Tan Street, Tay Thanh Ward, Tan Phu District, Ho Chi Minh City, Viet Nam
| | - Pankaj Raizada
- School of Advanced Chemical Sciences, Shoolini University, Solan, Himachal Pradesh, 173212, India.
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Truong AD, Tran HTT, Thi Nguyen H, Thi Chu N, Phan L, Thi Phan H, Thi Pham N, Nguyen VH, Nguyen LH, Pham DK, Ho PH, Vu Dang H. Identification of differentially expressed genes and metabolism signaling pathway in the spleen of broilers supplemented with probiotic Bacillus spp. Vet Immunol Immunopathol 2024; 272:110755. [PMID: 38643554 DOI: 10.1016/j.vetimm.2024.110755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 04/15/2024] [Accepted: 04/15/2024] [Indexed: 04/23/2024]
Abstract
Probiotics are essential in the body's nutrients, improving the ratio of meat to meat, immune response, and preventing diseases. In this study, RNA-sequencing (RNA-seq) was used to identify the differentially expressed genes (DEGs), enriched related pathways, and Gene Ontology (GO) terms among blank negative control (NC), supplemented with Bacillus spp. (BS) and commercial probiotic (PC) groups after a 42-day fed supplementation. The results showed that 2005, 1356, and 2189 DEGs were significantly altered in BS vs. NC, PC vs NC, and BS vs PC groups, respectively. On the other hand, 9 DEGs were further validated by qRT-PCR, indicating that the qRT-PCR and RNA-Seq results were more consistent. Therefore, the GO and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses of DEGs showed that the DEGs were mainly enriched to metabolism signalling pathways (alpha-linolenic acid metabolism, linoleic acid metabolism, tryptophan metabolism, tyrosine metabolism, ether lipid metabolism, and metabolic pathway, etc) and immune response pathways (cytokine-cytokine receptor interaction, MAPK signalling pathway, and intestinal immune network for IgA production, neuroactive ligand-receptor interaction etc). These results will provide a better understanding of the role of probiotics in chicken development and provide basic information on the genetic development of chickens.
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Affiliation(s)
- Anh Duc Truong
- Department of Biochemistry and Immunology, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi 100000, Viet Nam
| | - Ha Thi Thanh Tran
- Department of Biochemistry and Immunology, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi 100000, Viet Nam
| | - Huyen Thi Nguyen
- Department of Biochemistry and Immunology, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi 100000, Viet Nam
| | - Nhu Thi Chu
- Department of Biochemistry and Immunology, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi 100000, Viet Nam
| | - Lanh Phan
- Department of Biochemistry and Immunology, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi 100000, Viet Nam
| | - Hoai Thi Phan
- Department of Biochemistry and Immunology, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi 100000, Viet Nam
| | - Ngoc Thi Pham
- Department of Biochemistry and Immunology, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi 100000, Viet Nam
| | - Van Hai Nguyen
- Department of Food Engineering, School of Chemistry and Life Sciences, Hanoi University of Science and Technology (HUST), Hanoi 100000, Viet Nam
| | - Lan Huong Nguyen
- Department of Bioengineering, School of Chemistry and Life Sciences, Hanoi University of Science and Technology, Viet Nam
| | - Dang Kim Pham
- Faculty of Animal Science, Vietnam National University of Agriculture, Hanoi 100000, Viet Nam; Department of Livestock Production, Ministry of Agriculture and Rural Development, 16 Thuy Khue, Tay Ho, Hanoi 100000, Viet Nam
| | - Phu-Ha Ho
- Department of Food Engineering, School of Chemistry and Life Sciences, Hanoi University of Science and Technology (HUST), Hanoi 100000, Viet Nam.
| | - Hoang Vu Dang
- Department of Biochemistry and Immunology, National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi 100000, Viet Nam.
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Nguyen LH, Dinh DA, Thi LAP, Pham PV, Singh P, Raizada P, Lin KYA, Nguyen VH. Advances and perspectives of nanomaterials for photocatalytic degradation of biological ethylene toward the postharvest improvement of agricultural products. Environ Sci Pollut Res Int 2023:10.1007/s11356-023-31524-2. [PMID: 38147254 DOI: 10.1007/s11356-023-31524-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 12/09/2023] [Indexed: 12/27/2023]
Abstract
To date, intensive emphasis is required to develop advanced postharvest technologies to ensure food security, increase nutrition, and improve farmers toward cleaner production. How to effectively degrade the harmful gaseous ethylene (C2H4) biosynthesis, which distributes heavy losses of fresh-cut fruits and vegetables, has received considerable attention. Among various advanced techniques, photocatalytic degradation of biological C2H4 is proposed as the most promising method to solve this issue. In this context, the recent studies on the photodegradation of C2H4 have been critically summarized and highlighted. Many photocatalysts, including TiO2-based and non-TiO2-based (metal oxides (ZnO, WO3, Ga2O3), molybdates (β-Ag2MoO4), phosphides (Ag3PO4), perovskite oxides (Bi2WO6)) nanomaterials, have been revealed with credible performance results. Also, varying reaction parameters to optimize the photocatalytic degradation efficacy in the literature are summarized. We also discussed the current status, challenges, and prospects for enhanced photodegradation of C2H4 in this study. The efficacy and economics of photodegradation have played an essential role in selecting a particular type of photocatalyst. Although many efforts have been made, significant improvements are still required for photocatalysis. In this work, we have also successfully suggested some strategies to further promote this concept for controlling and degrading plant-generated C2H4 in fruit and vegetable postharvest in a sustainable and economically feasible manner.
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Affiliation(s)
- Lan Huong Nguyen
- Faculty of Biology and Environment, Ho Chi Minh City University of Industry and Trade (HUIT), 140 Le Trong Tan Street, Tay Thanh Ward, Tan Phu District, Ho Chi Minh City, Vietnam
| | - Duc Anh Dinh
- VKTech Research Center, NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City, 700000, Vietnam
| | - Lan-Anh Phan Thi
- VNU Key Laboratory of Analytical Technology for Environmental Quality and Food Safety Control (KLATEFOS), University of Science, Vietnam National University, 334 Nguyen Trai, Hanoi, Vietnam
- Center for Environmental Technology and Sustainable Development (CETASD), University of Science, Vietnam National University, 334 Nguyen Trai, Hanoi, Vietnam
| | - Phuong V Pham
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan
| | - Pardeep Singh
- School of Advanced Chemical Sciences, Shoolini University, Solan, Himachal Pradesh, 173212, India
| | - Pankaj Raizada
- School of Advanced Chemical Sciences, Shoolini University, Solan, Himachal Pradesh, 173212, India
| | - Kun-Yi Andrew Lin
- Institute of Analytical and Environmental Sciences, National Tsing Hua University, Hsinchu, Taiwan
- Department of Environmental Engineering & Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung, Taiwan
| | - Van-Huy Nguyen
- Centre for Herbal Pharmacology and Environmental Sustainability, Chettinad Hospital and Research Institute, Chettinad Academy of Research and Education, Kelambakkam, 603103, Tamil Nadu, India.
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Nguyen LH, Tran TVN, Hoang MG, Nguyen HG, Tong TK, Isobe Y, Kawasaki M, Ishigaki T, Kawamoto K. Material and monetary flows of construction and demolition waste and assessment on physical and environmental properties of illegally dumped construction and demolition waste in Hanoi. Environ Sci Pollut Res Int 2023; 30:125965-125976. [PMID: 38008831 DOI: 10.1007/s11356-023-30978-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Accepted: 11/05/2023] [Indexed: 11/28/2023]
Abstract
The main aim of this study is to investigate the material and monetary flows of CDW management and to characterize the distribution of illegally dumped CDW in Hanoi. Construction and demolition waste management has become a source of much concern to the urban authorities and citizens of big cities in Vietnam. It is estimated that 3000 t of CDW were generated per day from construction and demolition activities in Hanoi, but only 45% of the CDW was received at official landfills, while 55% of the CDW was disposed of elsewhere. The consequences of improper waste management are potentially alarming. The study conducted interviews to identify the material and cash flow associated with licensed and unlicensed contractors in CDW classification, transportation, treatment, and disposal, to characterize the distribution of illegally dumped CDW in two districts in Hanoi (urban and suburban districts), and to assess the composition of dumped CDW and environmental assessment of illegally dumped CDW by chemical analyses such as leaching and content tests. The study concluded that illegal dumping was performed mostly by unlicensed private companies. The illegally dumped CDW was mostly composed of mixed materials such as concrete, bricks, stones, and some hazardous materials such as asbestos and gypsum were found. The environmental concern of illegally dumped CDW was mostly dust, blockage of water ways, and inundation of increased suspended solids, whereas the heavy metal leaching concentration of all samples was below the environmental standards in Vietnam.
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Affiliation(s)
- Lan Huong Nguyen
- Department of Environmental Engineering, Hanoi University of Civil Engineering, No. 55, Giai Phong Street, Hai Ba Trung District, Hanoi, 10000, Vietnam
| | - Thi Viet Nga Tran
- Department of Environmental Engineering, Hanoi University of Civil Engineering, No. 55, Giai Phong Street, Hai Ba Trung District, Hanoi, 10000, Vietnam.
| | - Minh Giang Hoang
- Department of Environmental Engineering, Hanoi University of Civil Engineering, No. 55, Giai Phong Street, Hai Ba Trung District, Hanoi, 10000, Vietnam
| | - Hoang Giang Nguyen
- Department of Environmental Engineering, Hanoi University of Civil Engineering, No. 55, Giai Phong Street, Hai Ba Trung District, Hanoi, 10000, Vietnam
| | - Ton Kien Tong
- Department of Environmental Engineering, Hanoi University of Civil Engineering, No. 55, Giai Phong Street, Hai Ba Trung District, Hanoi, 10000, Vietnam
| | - Yugo Isobe
- Center for Environmental Science in Saitama, 914 Kamitanadare, Kazo, Saitama, 3470115, Japan
| | - Mikio Kawasaki
- Center for Environmental Science in Saitama, 914 Kamitanadare, Kazo, Saitama, 3470115, Japan
| | - Tomonori Ishigaki
- National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 3058506, Japan
| | - Ken Kawamoto
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Saitama, 3388570, Japan
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5
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Nguyen LH, Nguyen DL, Nguyen HH. Assessing applicability of two gridded precipitation datasets for hydrological simulation in a poorly gauged river basin towards supporting sustainable water resources management. Environ Res 2023; 237:116956. [PMID: 37619637 DOI: 10.1016/j.envres.2023.116956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 08/20/2023] [Accepted: 08/21/2023] [Indexed: 08/26/2023]
Abstract
Reliable and accurate precipitation estimates are important for hydrological studies and sustainable water resource management. However, networks of rain gauges are often sparsely and unevenly distributed in many large river basins in the world including the Red River basin (RRB). Thus this study aimed to comprehensively evaluate the applicability of two widely used gridded precipitation products, gauge-based APHRODITE and gauge satellite-based GSMaP-Gauge, over the RRB using both statistical and hydrological assessment approaches. The accuracy assessment of the gridded precipitation datasets was performed by comparing with the reference precipitation dataset derived from the local weather stations. The hydrological performance of both gridded products was evaluated through the Variable Infiltration Capacity (VIC) hydrological modelling scheme for simulation of daily streamflow at the hydrological stations in the RRB. The results demonstrated that both gridded products could generally capture the spatiotemporal variation of the reference precipitation over the RRB during the period of 2005-2014, although both underestimated the reference precipitation. Results of statistical analysis showed that the APHRODITE data outperformed the GSMaP-Gauge data in precipitation estimation. The performance of the VIC model driven by the gridded precipitation products in streamflow simulation was satisfactory, although simulations forced with APHRODITE data displayed the better performance. Generally, the APHRODITE product showed its encouraging potential for hydrological studies over the RRB.
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Affiliation(s)
- Lan Huong Nguyen
- Faculty of Environmental Engineering, Hanoi University of Civil Engineering (HUCE), 55 Giai Phong, Hanoi, Viet Nam
| | - Duc Luong Nguyen
- Faculty of Environmental Engineering, Hanoi University of Civil Engineering (HUCE), 55 Giai Phong, Hanoi, Viet Nam.
| | - Hoang Hiep Nguyen
- Graduate Institute of Applied Geology, National Central University, Taoyuan, 32000, Taiwan
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6
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Marcotte A, Mascarella MA, Nguyen LH, Nemeth J. Just the facts: indications and technique for emergency tracheotomy. CAN J EMERG MED 2023; 25:653-655. [PMID: 37300653 DOI: 10.1007/s43678-023-00538-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Accepted: 05/28/2023] [Indexed: 06/12/2023]
Affiliation(s)
- Audrey Marcotte
- Department of Emergency Medicine, McGill University, Montreal, QC, Canada.
- McGill University Health Center, Montreal, QC, Canada.
| | - Marco A Mascarella
- Department of Otolaryngology-Head and Neck Surgery, McGill University, Montreal, QC, Canada
- Centre for Clinical Epidemiology, Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, QC, Canada
- Department of Biomedical Sciences, Faculty of Medicine, Université de Montréal, Montréal, QC, Canada
| | - L H Nguyen
- Department of Otolaryngology-Head and Neck Surgery, McGill University, Montreal, QC, Canada
- Department of Pediatric Surgery, McGill University, Montreal, QC, Canada
- Institute of Health Sciences Education, McGill University, Montreal, QC, Canada
| | - Joe Nemeth
- Department of Emergency Medicine, McGill University, Montreal, QC, Canada
- McGill University Health Center, Montreal, QC, Canada
- Department of Pediatrics, McGill University, Montreal, QC, Canada
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7
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Ahn M, Chen VCW, Rozario P, Ng WL, Kong PS, Sia WR, Kang AEZ, Su Q, Nguyen LH, Zhu F, Chan WOY, Tan CW, Cheong WS, Hey YY, Foo R, Guo F, Lim YT, Li X, Chia WN, Sobota RM, Fu NY, Irving AT, Wang LF. Bat ASC2 suppresses inflammasomes and ameliorates inflammatory diseases. Cell 2023; 186:2144-2159.e22. [PMID: 37172565 DOI: 10.1016/j.cell.2023.03.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/12/2022] [Accepted: 03/31/2023] [Indexed: 05/15/2023]
Abstract
Bats are special in their ability to live long and host many emerging viruses. Our previous studies showed that bats have altered inflammasomes, which are central players in aging and infection. However, the role of inflammasome signaling in combating inflammatory diseases remains poorly understood. Here, we report bat ASC2 as a potent negative regulator of inflammasomes. Bat ASC2 is highly expressed at both the mRNA and protein levels and is highly potent in inhibiting human and mouse inflammasomes. Transgenic expression of bat ASC2 in mice reduced the severity of peritonitis induced by gout crystals and ASC particles. Bat ASC2 also dampened inflammation induced by multiple viruses and reduced mortality of influenza A virus infection. Importantly, it also suppressed SARS-CoV-2-immune-complex-induced inflammasome activation. Four key residues were identified for the gain of function of bat ASC2. Our results demonstrate that bat ASC2 is an important negative regulator of inflammasomes with therapeutic potential in inflammatory diseases.
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Affiliation(s)
- Matae Ahn
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore; SingHealth Duke-NUS Medicine Academic Clinical Program, Singapore 168753, Singapore; SingHealth PGY1 Residency Program, Singapore 169608, Singapore; Department of Internal Medicine, Singapore General Hospital, Singapore 169608, Singapore.
| | - Vivian Chih-Wei Chen
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Pritisha Rozario
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Wei Lun Ng
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Pui San Kong
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Wan Rong Sia
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Adrian Eng Zheng Kang
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Qi Su
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Lan Huong Nguyen
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Feng Zhu
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Wharton O Y Chan
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Chee Wah Tan
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Wan Shoo Cheong
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Ying Ying Hey
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Randy Foo
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Fusheng Guo
- Programme in Cancer and Stem Cell Biology, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Yan Ting Lim
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore; SingMass - National Mass Spectrometry Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore
| | - Xin Li
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore; SingMass - National Mass Spectrometry Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore
| | - Wan Ni Chia
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Radoslaw M Sobota
- Functional Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore; SingMass - National Mass Spectrometry Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A(∗)STAR), Singapore 138673, Singapore
| | - Nai Yang Fu
- Programme in Cancer and Stem Cell Biology, Duke-NUS Medical School, Singapore 169857, Singapore
| | - Aaron T Irving
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore; Zhejiang University-University of Edinburgh Institute, Zhejiang University School of Medicine, Zhejiang University, Haining 314400, China; Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Lin-Fa Wang
- Programme in Emerging Infectious Diseases, Duke-NUS Medical School, Singapore 169857, Singapore; SingHealth Duke-NUS Global Health Institute, Singapore 169857, Singapore.
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Nguyen LH, Nguyen BS, Le DT, Alomar TS, AlMasoud N, Ghotekar S, Oza R, Raizada P, Singh P, Nguyen VH. A concept for the biotechnological minimizing of emerging plastics, micro- and nano-plastics pollutants from the environment: A review. Environ Res 2023; 216:114342. [PMID: 36181894 DOI: 10.1016/j.envres.2022.114342] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 08/31/2022] [Accepted: 09/11/2022] [Indexed: 06/16/2023]
Abstract
Plastics, micro- and nano-plastics pollution are undoubtedly a severe and crucial ecological threat due to the durability of plastics and their destructive impacts on humans and wildlife. Most scientific investigations have addressed the classification, types, distribution, ingestion, fate, impacts, degradation, and various adverse effect of plastics. Heretofore, scanty reports have addressed implementing strategies for the remediation and mitigation of plastics. Therefore, in this paper, we review the current studies on the degradation of plastics, micro- and nano-plastics aided by microorganisms, and explore the relevant degradation properties and mechanisms. Diverse microorganisms are classified, such as bacteria, fungi, algae, cyanobacteria, wax worms, and enzymes that can decompose various plastics. Furthermore, bio-degradation is influenced by microbial features and environmental parameters; therefore, the ecological factors affecting plastic degradation and the resulting degradation consequences are discussed. In addition, the mechanisms underlying microbial-mediated plastic degradation are carefully studied. Finally, upcoming research directions and prospects for plastics degradation employing microorganisms are addressed. This review covers a comprehensive overview of the microorganism-assisted degradation of plastics, micro- and nano-plastics, and serves as a resource for future research into sustainable plastics pollution management methods.
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Affiliation(s)
- Lan Huong Nguyen
- Faculty of Biology and Environment, Ho Chi Minh City University of Food Industry, 140 Le Trong Tan Street, Tay Thanh Ward, Tan Phu District, Ho Chi Minh City, Viet Nam
| | - Ba-Son Nguyen
- Department of Renewable Energy, HCMC University of Technology and Education, Ho Chi Minh City, 700000, Viet Nam
| | - Duy-Tien Le
- Faculty of Pharmacy, Lac Hong University, Dong Nai Province, Viet Nam.
| | - Taghrid S Alomar
- Department of Chemistry, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh, 11671, Saudi Arabia
| | - Najla AlMasoud
- Department of Chemistry, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh, 11671, Saudi Arabia
| | - Suresh Ghotekar
- Department of Chemistry, Smt. Devkiba Mohansinhji Chauhan College of Commerce and Science, University of Mumbai, Silvassa, 396 230, Dadra and Nagar Haveli (UT), India.
| | - Rajeshwari Oza
- Department of Chemistry, S.N. Arts, D.J.M. Commerce and B.N.S. Science College, Savitribai Phule Pune University, Sangamner, 422 605, Maharashtra, India
| | - Pankaj Raizada
- School of Advanced Chemical Sciences, Shoolini University, Solan, Himachal Pradesh, 173229, India
| | - Pardeep Singh
- School of Advanced Chemical Sciences, Shoolini University, Solan, Himachal Pradesh, 173229, India
| | - Van-Huy Nguyen
- Chettinad Hospital and Research Institute, Chettinad Academy of Research and Education (CARE), Chengalpattu District, Kelambakkam, Tamil Nadu, 603103, India.
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Mohideen FI, Nguyen LH, Richard JD, Ouadhi S, Kwan DH. In Vitro Reconstitution of the dTDP-l-Daunosamine Biosynthetic Pathway Provides Insights into Anthracycline Glycosylation. ACS Chem Biol 2022; 17:3331-3340. [PMID: 34751552 DOI: 10.1021/acschembio.1c00646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Many small molecule natural products are decorated with sugar moieties that are essential for their biological activity. A considerable number of natural product glycosides and their derivatives are clinically important therapeutics. Anthracyclines like daunorubicin and doxorubicin are examples of valuable glycosylated natural products used in medicine as potent anticancer agents. The sugar moiety, l-daunosamine (a highly modified deoxyhexose), plays a key role in the bioactivity of these molecules as evidenced by semisynthetic anthracycline derivatives such as epirubicin, wherein alteration in the configuration of a single stereocenter of the sugar unit generates a chemotherapeutic drug with lower cardiotoxicity. The nucleotide activated sugar donor that provides the l-daunosamine group for attachment to the natural product scaffold in the biosynthesis of these anthracyclines is dTDP-l-daunosamine. In an in vitro system, we have reconstituted the enzymes in the daunorubicin/doxorubicin pathway involved in the biosynthesis of dTDP-l-daunosamine. Through the study of the enzymatic steps in this reconstituted pathway, we have gained several insights into the assembly of this precursor including the identification of a major bottleneck and competing reactions. We carried out kinetic analysis of the aminotransferase that catalyzes a limiting step of the pathway. Our in vitro reconstituted pathway also provided a platform to test the combinatorial enzymatic synthesis of other dTDP-activated deoxyhexoses as potential tools for "glycodiversification" of natural products. To this end, we replaced the stereospecific ketoreductase that acts in the last step of dTDP-l-daunosamine biosynthesis with an enzyme from a heterologous pathway with opposite stereospecificity and found that it is active in the in vitro pathway, demonstrating the potential for the enzymatic synthesis of nucleotide-activated sugars with regio- and stereospecific tailoring.
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Affiliation(s)
- F Ifthiha Mohideen
- Department of Biology, Centre for Applied Synthetic Biology, and Centre for Structural and Functional Genomics, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec, Canada H4B 1R6.,PROTEO, Quebec Network for Research on Protein Function, Structure, and Engineering, Quebec City, Quebec, Canada G1V 0A6
| | - Lan Huong Nguyen
- Department of Biology, Centre for Applied Synthetic Biology, and Centre for Structural and Functional Genomics, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec, Canada H4B 1R6.,PROTEO, Quebec Network for Research on Protein Function, Structure, and Engineering, Quebec City, Quebec, Canada G1V 0A6
| | - Joël D Richard
- Department of Biology, Centre for Applied Synthetic Biology, and Centre for Structural and Functional Genomics, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec, Canada H4B 1R6
| | - Sara Ouadhi
- PROTEO, Quebec Network for Research on Protein Function, Structure, and Engineering, Quebec City, Quebec, Canada G1V 0A6.,Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec, Canada, H4B 1R6
| | - David H Kwan
- Department of Biology, Centre for Applied Synthetic Biology, and Centre for Structural and Functional Genomics, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec, Canada H4B 1R6.,PROTEO, Quebec Network for Research on Protein Function, Structure, and Engineering, Quebec City, Quebec, Canada G1V 0A6.,Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec, Canada, H4B 1R6
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Huong Nguyen L, Son Le V, Dung Tran L, Van Thai N, Thi Ngoc Tram H, Quang Minh B, Nguyen VH. Environmental-friendly method for preparing CoFe2O4 coated biopolymer extracted from dragon fruit peel: Characterization and application as nanocomposite adsorbent for removal of As(III) pollutants from aqueous solution. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.11.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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11
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Nguyen LH, Nguyen TD, Tran TVN, Nguyen DL, Tran HS, Nguyen TL, Nguyen TH, Nguyen HG, Nguyen TP, Nguyen NT, Isawa T, Ta Y, Sato R. Steel slag quality control for road construction aggregates and its environmental impact: case study of Vietnamese steel industry-leaching of heavy metals from steel-making slag. Environ Sci Pollut Res Int 2022; 29:41983-41991. [PMID: 34564812 DOI: 10.1007/s11356-021-16438-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 09/05/2021] [Indexed: 06/13/2023]
Abstract
Steel slag is an industrial by product of steel manufacturing processes and has been widely utilized within civil and construction materials for road materials and environmental remediation in countries like Japan, USA, and European Union nations. However, the current utilization of steel slag in Vietnam is very low mainly because of lack of quality control of slag treatment and chances for reuse of treated steel slag. This paper presents the up to date steel slag production status in Vietnam through the extensive survey and sampling at seven large steel factories. The paper also highlights the environmental and quality control issues of these steel slags to use as road construction aggregates by assessing the heavy metals concentration in the leachate. The basic oxygen furnace (BOF) and electric arc furnace (EAF) slag samples were collected to evaluate leaching properties of metals leached from the slags. The two standardized batch leaching tests of steel slag roadbed material in Japan (JIS K 0058-1) and toxicity characteristics leaching procedure (TCLP-EPA method 1311) were performed to the evaluated the hazardous metals. The results of the leaching test show that almost all of the concentration of the metals in the leached solution does not exceed the National Standard for Industrial Wastewater Discharge (QCVN 40-2011). The pH and parameters such as total chromium, nickel, copper, lead, arsenic, and manganese differ from the two test methods. The acidic conditions employed in the EPA 1311 were not representative of condition excepted during slag reuse in road constructions because in the operation condition of the road, acidic liquid is absent. The leaching test results confirmed that JIS test which uses deionized water with gentle mixing prevents the slag sample from size degradation is suitable for the environmental assessment of steel slag use for roadbed material. This research suggests that the adjustment of pH value prior to disposal or reuse as base materials and official guideline should be promulgate by the authorities to ensure the leachate meet the surface water quality standard.
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Affiliation(s)
- Lan Huong Nguyen
- Faculty of Environmental Engineering, Hanoi University of Civil Engineering, Hanoi, Vietnam
| | - Tien Dung Nguyen
- Faculty of Building Materials, Hanoi University of Civil Engineering, Hanoi, Vietnam
| | - Thi Viet Nga Tran
- Faculty of Environmental Engineering, Hanoi University of Civil Engineering, Hanoi, Vietnam
| | - Duc Luong Nguyen
- Faculty of Environmental Engineering, Hanoi University of Civil Engineering, Hanoi, Vietnam
| | - Hoai Son Tran
- Faculty of Environmental Engineering, Hanoi University of Civil Engineering, Hanoi, Vietnam
| | - Thuy Lien Nguyen
- Faculty of Environmental Engineering, Hanoi University of Civil Engineering, Hanoi, Vietnam
| | - Thi Huong Nguyen
- Vietnam Japan Institute for Advanced Technology, Hanoi University of Civil Engineering, Hanoi, Vietnam
| | - Hoang Giang Nguyen
- Faculty of Building and Industrial Construction, Hanoi University of Civil Engineering, Hanoi, Vietnam.
| | - Tan Phong Nguyen
- Faculty of Environment, Natural Resources and Climate Change, Ho Chi Minh City University of Food Industry, Ho Chi Minh City, Vietnam
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Hoang L, Tran NH, Urynowicz M, Dong VG, To KA, Huang Z, Nguyen LH, Pham TMP, Nguyen DD, Do CD, Le QH. The characteristics of coalbed water and coal in a coal seam situated in the Red River Basin, Vietnam. Sci Total Environ 2022; 807:151056. [PMID: 34673062 DOI: 10.1016/j.scitotenv.2021.151056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Revised: 10/05/2021] [Accepted: 10/14/2021] [Indexed: 06/13/2023]
Abstract
An in-depth understanding of the hydrogeochemical characteristics of coal mines is helpful in establishing an effective and successful exploration program of coalbed methane (CBM). This study provides a comprehensive analysis of hydrogeological characteristics, characteristics of coalbed water, and characteristics of the coal sample from a coal seam located in the Red River Basin (RRB). These physicochemical characteristics along with the microbial composition of coalbed water were critically analyzed. A high concentration of chloride and sodium was found in the coalbed water, presumably due to the coal mine's stratigraphic association with marine or marine-transitional beds. A correlation between the occurrence of microbes and the chemical components in the coalbed water was established. The characteristics of the coal were systematically analyzed, including proximate, ultimate, and petrographic analyses. Based on the coal macerals, coal rank is classified as low-rank (sub-bituminous) with a vitrinite reflectance (Ro, max) of 0.36%, suggesting that this type of low-rank coal is favorable for biogenic methane generation. Pore structures and pore types were characterized using different methods, including low-temperature nitrogen adsorption/desorption (LTNA), mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM). Coal from the study area has microporous and macroporous features. Pore types of the coal were also characterized using SEM. The primary genetic pore types of the Red River coal include plant tissue holes and blowholes.
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Affiliation(s)
- Lan Hoang
- School of Biotechnology and Food Technology, Hanoi University of Science and Technology, No. 1 Dai Co Viet, Hanoi, Viet Nam; Faculty of Materials Science and Engineering, Phenikaa University, Yen Nghia, Ha Dong, Hanoi, Viet Nam
| | - Ngoc Han Tran
- NUS Environmental Research Institute, National University of Singapore, 1 Create Way, Create Tower, #15-02, Singapore 138602, Singapore.
| | - Michael Urynowicz
- Civil & Architectural Engineering Department, University of Wyoming, Laramie, WY 82071, USA
| | - Van Giap Dong
- General Department of Geology and Minerals of Viet Nam, No. 6 Pham Ngu Lao, Hoan Kiem, Hanoi, Viet Nam
| | - Kim Anh To
- School of Biotechnology and Food Technology, Hanoi University of Science and Technology, No. 1 Dai Co Viet, Hanoi, Viet Nam
| | - Zaixing Huang
- Civil & Architectural Engineering Department, University of Wyoming, Laramie, WY 82071, USA; Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Lan Huong Nguyen
- School of Biotechnology and Food Technology, Hanoi University of Science and Technology, No. 1 Dai Co Viet, Hanoi, Viet Nam
| | - Thi Mai Phuong Pham
- Advanced Institute of Science and Technology, Hanoi University of Science and Technology, No. 1 Dai Co Viet, Hanoi, Viet Nam
| | - Duc Dung Nguyen
- Advanced Institute of Science and Technology, Hanoi University of Science and Technology, No. 1 Dai Co Viet, Hanoi, Viet Nam
| | - Canh Duong Do
- General Department of Geology and Minerals of Viet Nam, No. 6 Pham Ngu Lao, Hoan Kiem, Hanoi, Viet Nam
| | - Quoc Hung Le
- General Department of Geology and Minerals of Viet Nam, No. 6 Pham Ngu Lao, Hoan Kiem, Hanoi, Viet Nam.
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Tho PT, Van HT, Nguyen LH, Hoang TK, Ha Tran TN, Nguyen TT, Hanh Nguyen TB, Nguyen VQ, Le Sy H, Thai VN, Tran QB, Sadeghzadeh SM, Asadpour R, Thang PQ. Enhanced simultaneous adsorption of As(iii), Cd(ii), Pb(ii) and Cr(vi) ions from aqueous solution using cassava root husk-derived biochar loaded with ZnO nanoparticles. RSC Adv 2021; 11:18881-18897. [PMID: 35478660 PMCID: PMC9033486 DOI: 10.1039/d1ra01599k] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Accepted: 05/19/2021] [Indexed: 12/23/2022] Open
Abstract
This study presents the modification of cassava root husk-derived biochar (CRHB) with ZnO nanoparticles (ZnO-NPs) for the simultaneous adsorption of As(iii), Cd(ii), Pb(ii) and Cr(vi). By conducting batch-mode experiments, it was concluded that 3% w/w was the best impregnation ratio for the modification of CRHB using ZnO-NPs, and was denoted as CRHB-ZnO3 in this study. The optimal conditions for heavy metal adsorption were obtained at a pH of 6–7, contact time of 60 min, and initial metal concentration of 80 mg L−1. The heavy metal adsorption capacities onto CRHB-ZnO3 showed the following tendency: Pb(ii) > Cd(ii) > As(iii) > Cr(vi). The total optimal adsorption capacity achieved in the adsorption of the 4 abovementioned metals reached 115.11 and 154.21 mg g−1 for CRHB and CRHB-ZnO3, respectively. For each Pb(ii), Cd(ii), As(iii), and Cr(vi) metal, the maximum adsorption capacities of CRHB-ZnO3 were 44.27, 42.05, 39.52, and 28.37 mg g−1, respectively, and those of CRHB were 34.47, 32.33, 26.42 and 21.89 mg g−1, respectively. In terms of kinetics, both the pseudo-first-order and the pseudo-second-order fit well with metal adsorption onto biochars with a high correlation coefficient of R2, while the best isothermal description followed the Langmuir model. As a result, the adsorption process of heavy metals onto biochars was chemisorption on homogeneous monolayers, which was mainly controlled by cation exchange and surface precipitation mechanisms due to enriched oxygen-containing surface groups with ZnO-NP modification of biochar. The FTIR and EDS analysis data confirmed the important role of oxygen-containing surface groups, which significantly contributed to removal of heavy metals with extremely high adsorption capacities, comparable with other studies. In conclusion, due to very high adsorption capacities for metal cations, the cassava root husk-derived biochar modified with ZnO-NPs can be applied as the alternative, inexpensive, non-toxic and highly effective adsorbent in the removal of various toxic cations. This study presents the modification of cassava root husk-derived biochar (CRHB) with ZnO nanoparticles (ZnO-NPs) for the simultaneous adsorption of As(iii), Cd(ii), Pb(ii) and Cr(vi).![]()
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Affiliation(s)
- P T Tho
- Laboratory of Magnetism and Magnetic Materials, Advanced Institute of Materials Science, Ton Duc Thang University Ho Chi Minh City Vietnam .,Faculty of Applied Sciences, Ton Duc Thang University Ho Chi Minh City Vietnam
| | - Huu Tap Van
- Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam
| | - Lan Huong Nguyen
- Faculty of Environment - Natural Resources and Climate Change, Ho Chi Minh City University of Food Industry (HUFI) Ho Chi Minh City Vietnam
| | - Trung Kien Hoang
- Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam
| | - Thi Ngoc Ha Tran
- Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam
| | - Thi Tuyet Nguyen
- Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam
| | - Thi Bich Hanh Nguyen
- Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam
| | - Van Quang Nguyen
- The Center for Technology Incubator and Startup Support, Thai Nguyen University of Agriculture and Forestry Quyet Thang Ward Thai Nguyen City Vietnam
| | - Hung Le Sy
- Advanced Educational Program, Thai Nguyen University of Agriculture and Forestry Quyet Thang Ward Thai Nguyen City Vietnam
| | - Van Nam Thai
- HUTECH Institute of Applied Sciences, Ho Chi Minh City University of Technology (HUTECH) 475A Dien Bien Phu, Ward 25, Binh Thanh Dist Ho Chi Minh City Vietnam
| | - Quoc Ba Tran
- Institute of Research and Development, Duy Tan University Da Nang 550000 Vietnam .,Faculty of Environmental and Chemical Engineering, Duy Tan University Da Nang 550000 Vietnam
| | - Seyed Mohsen Sadeghzadeh
- New Materials Technology and Processing Research Center, Department of Chemistry, Neyshabur Branch, Islamic Azad University Neyshabur Iran
| | - Robabeh Asadpour
- Geosciences & Petroleum Engineering Department, Universiti Teknologi PETRONAS 32610 Bandar Seri Iskandar Perak Darul Ridzuan Malaysia
| | - Phan Quang Thang
- Institute of Environmental Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road Ha Noi City Vietnam
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Dang VM, Van HT, Vinh ND, Hoa Duong TM, Hanh Nguyen TB, Nguyen TT, Ha Tran TN, Hoang TK, Tran TP, Nguyen LH, Chu MN. Enhancement of exchangeable Cd and Pb immobilization in contaminated soil using Mg/Al LDH-zeolite as an effective adsorbent. RSC Adv 2021; 11:17007-17019. [PMID: 35479705 PMCID: PMC9031545 DOI: 10.1039/d0ra10530a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 05/05/2021] [Indexed: 11/21/2022] Open
Abstract
In the present study, experiments using zeolite and Mg/Al LDH-zeolite for immobilization of Cd and Pb ions in artificial soil were conducted. The conditions which affect Cd and Pb ion immobilization in soil were evaluated, namely soil pH (5-7), the mass ratio of adsorbents (1%, 3% and 5%), incubation time (15 days, 30 days and 45 days) and soil moisture (30%, 50% and 70%). The results indicated that the optimal soil pH, mass ratio of adsorbents, incubation time and soil moisture for immobilization of Cd and Pb ions by the adsorbent were, respectively, 7.0, 3%, 30 days and 70%. The exchangeable Cd ion content in the contaminated soil dropped from 22.17 mg kg-1 (87.65%) to 11.03 mg kg-1 (43.48%) and 6.47 mg kg-1 (26.36%) on incubation with zeolite and Mg/Al LDH-zeolite, respectively, while the exchangeable Pb content fell from 23.28 mg kg-1 (90.02%) to 14.12 mg kg-1 (54.04%) and 9.47 mg kg-1 (35.24%) using zeolite and Mg/Al LDH-zeolite as absorbents in contaminated soil, respectively. Fe-Mn oxide occluded (F2), carbonate bound (F3) and organically complexed (F4) were the main forms for immobilization of the exchangeable Cd and Pb when the zeolite and Mg/Al LDH-zeolite absorbents were separately cultivated into soil. Precipitation, co-precipitation and electrostatic attraction were the main mechanisms of exchangeable Cd and Pb immobilization onto the Mg/Al LDH-zeolite to form carbonate metals (CdCO3 and PbCO3). This was due to the surface functional groups of the adsorbent and the presence of Fe and Al oxyhydroxides, Mn oxides, and Si and O elements in the Mg/Al LDH-zeolite's constituents. The efficiency of Cd and Pb immobilization by the Mg/Al LDH-zeolite was higher than that by zeolite from 1.5 to 1.6 times. The Mg/Al LDH-zeolite showed an enhanced ability of exchangeable Cd and Pb immobilization in contaminated soil.
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Affiliation(s)
- Van Minh Dang
- Thai Nguyen University Tan Thinh ward Thai Nguyen city Vietnam
| | - Huu Tap Van
- Faculty of Natural Resources and Environment, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - N D Vinh
- Faculty of Chemistry, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - Thi Minh Hoa Duong
- Faculty of Environment, TNU - University of Agriculture and Forestry Quyet Thang ward Thai Nguyen city Vietnam
| | - Thi Bich Hanh Nguyen
- Faculty of Natural Resources and Environment, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - Thị Tuyet Nguyen
- Faculty of Natural Resources and Environment, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - Thi Ngoc Ha Tran
- Faculty of Natural Resources and Environment, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - Trung Kien Hoang
- Faculty of Natural Resources and Environment, TNU - University of Sciences Tan Thinh ward Thai Nguyen city Vietnam
| | - Thị Pha Tran
- Faculty of Environment, TNU - University of Agriculture and Forestry Quyet Thang ward Thai Nguyen city Vietnam
| | - Lan Huong Nguyen
- Faculty of Environment - Natural Resources and Climate Change, Ho Chi Minh City University of Food Industry (HUFI) Ho Chi Minh City Vietnam
| | - Manh Nhuong Chu
- Faculty of chemistry, TNU - University of Education No. 20, Luong Ngoc Quyen Road Thai Nguyen City Vietnam
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Nguyen LH, Ngo QN, Van HT, Thai VN, Nguyen TP, Phan Thi KO. Reutilization of Fe-containing tailings ore enriched by iron(iii) chloride as a heterogeneous Fenton catalyst for decolorization of organic dyes. RSC Adv 2021; 11:15871-15884. [PMID: 35481214 PMCID: PMC9030600 DOI: 10.1039/d1ra02939h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 04/22/2021] [Indexed: 11/30/2022] Open
Abstract
In this study, the Fe-containing tailings (Fe-TO) ore was reutilized and enriched with FeCl3 as a heterogeneous catalyst for the Fenton process to degrade the organic dyes from aqueous solution. The determinants of the heterogeneous catalytic Fenton system which included iron modification ratio, solution pH, catalyst dosage, H2O2 dosage and initial concentration of organic dyes were systematically investigated. The modification ratio of 15% (w/w of iron), pH of 3, MFe-TO15 dosage of 0.5 g L−1 and H2O2 dosage of 840 mg L−1 were chosen as the best operational conditions for Fenton oxidation of organic dyes. The decolorization efficiency of both MB and RhB by MFe-TO15/H2O2 was higher than that of Fe-TO/H2O2 by about two times. The kinetic study showed the degradation of organic dyes well fitted the pseudo-first-order kinetic model with apparent constant rate values (Kd) following the same sequence as the degradation efficiency of organic dyes. The degradation mechanism of dyes could be attributed to adsorption due to the good-development in textural properties of the iron modified catalyst (MFe-TO) with an increase in BET surface area, pore volume and pore diameter of, respectively, 2, 5 and 5 times and leaching iron through homogeneous Fenton reaction. However, the oxidation process occurring on the MFe-TO15's surface by heterogeneous Fenton reaction which enhanced decomposition of H2O2 for continuous generation of hydroxyl radicals was the main mechanism. The key role of *OH radical in oxidation of organic dyes was further ascertained by the remarkable drop in the decolorization of both organic dyes when the various radical-scavengers, including tert-butanol and chloride were supplemented into Fenton systems. A good stability of the catalyst was obtained through leaching test with low leaching iron ratio. The applied modified catalyst remained stable through three consecutive runs. From these findings, it can be concluded that the modified material can be applied as a feasible, inexpensive and highly effective catalyst for removal of persistent organic compounds from wastewater. In this study, the Fe-containing tailings (Fe-TO) ore was reutilized and enriched with FeCl3 as a heterogeneous catalyst for the Fenton process to degrade the organic dyes from aqueous solution.![]()
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Affiliation(s)
- Lan Huong Nguyen
- Faculty of Environment-Natural Resources and Climate Change, Ho Chi Minh City University of Food Industry (HUFI) Ho Chi Minh City Vietnam
| | - Quoc Nguyen Ngo
- Viet Nhat Industry Joint Stock Company 140 Phan Anh Street, Tan Thoi Hoa Ward, Tan Phu District Ho Chi Minh City Vietnam
| | - Huu Tap Van
- Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam
| | - Van Nam Thai
- HUTECH Institute of Applied Sciences, Ho Chi Minh City University of Technology (HUTECH) 475A Dien Bien Phu, Ward 25, Binh Thanh District Ho Chi Minh City Vietnam
| | - Tan Phong Nguyen
- Faculty of Environment-Natural Resources and Climate Change, Ho Chi Minh City University of Food Industry (HUFI) Ho Chi Minh City Vietnam
| | - Kieu Oanh Phan Thi
- Institute for Tropicalization and Environment (ITE) 57A Truong Quoc Dung Street, Phu Nhuan District Ho Chi Minh City Vietnam
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Antonelli M, Capdevila J, Chaudhari A, Granerod J, Canas LS, Graham MS, Klaser K, Modat M, Molteni E, Murray B, Sudre CH, Davies R, May A, Nguyen LH, Drew DA, Joshi A, Chan AT, Cramer JP, Spector T, Wolf J, Ourselin S, Steves CJ, Loeliger AE. Optimal symptom combinations to aid COVID-19 case identification: Analysis from a community-based, prospective, observational cohort. J Infect 2021; 82:384-390. [PMID: 33592254 PMCID: PMC7881291 DOI: 10.1016/j.jinf.2021.02.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 02/08/2021] [Accepted: 02/10/2021] [Indexed: 01/10/2023]
Abstract
Objectives Diagnostic work-up following any COVID-19 associated symptom will lead to extensive testing, potentially overwhelming laboratory capacity whilst primarily yielding negative results. We aimed to identify optimal symptom combinations to capture most cases using fewer tests with implications for COVID-19 vaccine developers across different resource settings and public health. Methods UK and US users of the COVID-19 Symptom Study app who reported new-onset symptoms and an RT-PCR test within seven days of symptom onset were included. Sensitivity, specificity, and number of RT-PCR tests needed to identify one case (test per case [TPC]) were calculated for different symptom combinations. A multi-objective evolutionary algorithm was applied to generate combinations with optimal trade-offs between sensitivity and specificity. Findings UK and US cohorts included 122,305 (1,202 positives) and 3,162 (79 positive) individuals. Within three days of symptom onset, the COVID-19 specific symptom combination (cough, dyspnoea, fever, anosmia/ageusia) identified 69% of cases requiring 47 TPC. The combination with highest sensitivity (fatigue, anosmia/ageusia, cough, diarrhoea, headache, sore throat) identified 96% cases requiring 96 TPC. Interpretation We confirmed the significance of COVID-19 specific symptoms for triggering RT-PCR and identified additional symptom combinations with optimal trade-offs between sensitivity and specificity that maximize case capture given different resource settings.
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Affiliation(s)
- M Antonelli
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom
| | | | - A Chaudhari
- Coalition for Epidemic Preparedness Innovations, London, United Kingdom
| | - J Granerod
- Coalition for Epidemic Preparedness Innovations, London, United Kingdom
| | - L S Canas
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom
| | - M S Graham
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom
| | - K Klaser
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom
| | - M Modat
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom
| | - E Molteni
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom
| | - B Murray
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom
| | - C H Sudre
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom; MRC Unit for Lifelong Health and Ageing at UCL/Centre for Medical Image Computing, Department of Computer Science, UCL, London, United Kingdom
| | - R Davies
- Zoe Global, London, United Kingdom
| | - A May
- Zoe Global, London, United Kingdom
| | - L H Nguyen
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States; Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - D A Drew
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States; Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - A Joshi
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States; Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - A T Chan
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States; Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - J P Cramer
- Coalition for Epidemic Preparedness Innovations, London, United Kingdom
| | - T Spector
- Department of Twin Research and Genetic Epidemiology, King's College London, London, United Kingdom
| | - J Wolf
- Zoe Global, London, United Kingdom
| | - S Ourselin
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom
| | - C J Steves
- Department of Twin Research and Genetic Epidemiology, King's College London, London, United Kingdom.
| | - A E Loeliger
- Coalition for Epidemic Preparedness Innovations, London, United Kingdom
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Antonelli M, Capdevila J, Chaudhari A, Granerod J, Canas LS, Graham MS, Klaser K, Modat M, Molteni E, Murray B, Sudre CH, Davies R, May A, Nguyen LH, Drew DA, Joshi A, Chan AT, Cramer JP, Spector T, Wolf J, Ourselin S, Steves CJ, Loeliger AE. Optimal symptom combinations to aid COVID-19 case identification: analysis from a community-based, prospective, observational cohort. medRxiv 2021:2020.11.23.20237313. [PMID: 33269364 PMCID: PMC7709185 DOI: 10.1101/2020.11.23.20237313] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVES Diagnostic work-up following any COVID-19 associated symptom will lead to extensive testing, potentially overwhelming laboratory capacity whilst primarily yielding negative results. We aimed to identify optimal symptom combinations to capture most cases using fewer tests with implications for COVID-19 vaccine developers across different resource settings and public health. METHODS UK and US users of the COVID-19 Symptom Study app who reported new-onset symptoms and an RT-PCR test within seven days of symptom onset were included. Sensitivity, specificity, and number of RT-PCR tests needed to identify one case (test per case [TPC]) were calculated for different symptom combinations. A multi-objective evolutionary algorithm was applied to generate combinations with optimal trade-offs between sensitivity and specificity. FINDINGS UK and US cohorts included 122,305 (1,202 positives) and 3,162 (79 positive) individuals. Within three days of symptom onset, the COVID-19 specific symptom combination (cough, dyspnoea, fever, anosmia/ageusia) identified 69% of cases requiring 47 TPC. The combination with highest sensitivity (fatigue, anosmia/ageusia, cough, diarrhoea, headache, sore throat) identified 96% cases requiring 96 TPC. INTERPRETATION We confirmed the significance of COVID-19 specific symptoms for triggering RT-PCR and identified additional symptom combinations with optimal trade-offs between sensitivity and specificity that maximize case capture given different resource settings.
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Affiliation(s)
- M Antonelli
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | | | - A Chaudhari
- Coalition for Epidemic Preparedness Innovations, London, UK
| | - J Granerod
- Coalition for Epidemic Preparedness Innovations, London, UK
| | - L S Canas
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - M S Graham
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - K Klaser
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - M Modat
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - E Molteni
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - B Murray
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - C H Sudre
- MRC Unit for Lifelong Health and Ageing at UCL/Centre for Medical Image Computing, Department of Computer Science, UCL, London, UK
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | | | | | - L H Nguyen
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - D A Drew
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - A Joshi
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - A T Chan
- Clinical and Translational Epidemiology Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - J P Cramer
- Coalition for Epidemic Preparedness Innovations, London, UK
| | - T Spector
- Department of Twin Research and Genetic Epidemiology, King's College London, London, UK
| | | | - S Ourselin
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | - C J Steves
- Department of Twin Research and Genetic Epidemiology, King's College London, London, UK
| | - A E Loeliger
- Coalition for Epidemic Preparedness Innovations, London, UK
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18
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Van HT, Nguyen LH, Dang NV, Chao HP, Nguyen QT, Nguyen TH, Nguyen TBL, Thanh DV, Nguyen HD, Thang PQ, Thanh PTH, Hoang VP. The enhancement of reactive red 24 adsorption from aqueous solution using agricultural waste-derived biochar modified with ZnO nanoparticles. RSC Adv 2021; 11:5801-5814. [PMID: 35423085 PMCID: PMC8694736 DOI: 10.1039/d0ra09974k] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 01/17/2021] [Indexed: 11/21/2022] Open
Abstract
In this study, two types of agricultural wastes, sugarcane bagasse (SB) and cassava root husks (CRHs), were used to fabricate biochars. The pristine biochars derived from SB and CRHs (SBB and CRHB, respectively) were modified using ZnO nanoparticles to generate modified biochars (SBB-ZnO and CRHB-ZnO, respectively) for the removal of Reactive Red 24 (RR24) from stimulated wastewater. Batch experiments were performed to evaluate the effects of ZnO nanoparticles' loading ratio, solution pH, contact time, and initial RR24 concentration on the RR24 adsorption capacity of biochars. The RR24 adsorption isotherm and kinetic data on SBB, SBB-ZnO3, CRHB, and CRHB-ZnO3 were analyzed. Results indicate that SB- and CRH-derived biochars with a ZnO nanoparticle loading ratio of 3 wt% could generate maximum adsorption capacities of RR24 thanks to the double growth on the BET surface of modified biochars. The RR24 adsorption capacities of CRHB-ZnO3 and SBB-ZnO3 reached 81.04 and 105.24 mg g-1, respectively, which were much higher than those of pristine CRHB and SBB (66.19 and 76.14, respectively) at an initial RR24 concentration of 250 mg L-1, pH 3, and contact time of 60 min. The adsorption of RR24 onto biochars agreed well with the pseudo-first-order model and the Langmuir isotherm. The RR24 adsorption capacity on modified biochars, which were reused after five adsorption-desorption cycles showed no insignificant drop. The main adsorption mechanisms of RR24 onto biochars were controlled by electrostatic interactions between biochars' surface positively charged functional groups with azo dye anions, pore filling, hydrogen bonding formation, and π-π interaction.
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Affiliation(s)
- Huu Tap Van
- Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City 24000 Vietnam
| | - Lan Huong Nguyen
- Faculty of Environment - Natural Resources and Climate Change, Ho Chi Minh City University of Food Industry (HUFI) Ho Chi Minh City Vietnam
| | - N V Dang
- Faculty of Physics and Technology, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam
| | - Huan-Ping Chao
- Department of Environmental Engineering, Chung Yuan Christian University Taoyuan 32023 Taiwan
| | - Quang Trung Nguyen
- Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City 24000 Vietnam
| | - Thu Huong Nguyen
- Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City 24000 Vietnam
| | - Thi Bich Lien Nguyen
- Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City 24000 Vietnam
| | - Dang Van Thanh
- TNU - University of Medicine and Pharmacy Thai Nguyen Vietnam
| | - Hai Duy Nguyen
- Faculty of Environment, Thai Nguyen University of Agriculture and Forestry (TUAF) Thai Nguyen City 24000 Vietnam
| | - Phan Quang Thang
- Institute of Environmental Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road Ha Noi City Vietnam
| | - Pham Thi Ha Thanh
- Faculty of Chemistry, TNU - University of Education No. 20, Luong Ngoc Quyen Road Thai Nguyen City Vietnam
| | - Vinh Phu Hoang
- School of Chemistry, Biology and Environment, Vinh University No. 182 Le Duan Vinh City Nghe An Province Vietnam
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Nguyen LH, Nguyen HD, Tran PT, Nghiem TT, Nguyen TT, Dao VL, Phan TN, To AK, Hatamoto M, Yamaguchi T, Kasai D, Fukuda M. Biodegradation of natural rubber and deproteinized natural rubber by enrichment bacterial consortia. Biodegradation 2020; 31:303-317. [PMID: 32914250 DOI: 10.1007/s10532-020-09911-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 09/05/2020] [Indexed: 11/28/2022]
Abstract
This study examined the biodegradation of natural rubber (NR) and deproteinized natural rubber (DPNR) by bacterial consortia enriched from a rubber-processing factory's waste in Vietnam. The results reveal the degradation in both NR and DPNR, and the DPNR was degraded easier than NR. The highest weight loss of 48.37% was obtained in the fourth enrichment consortium with DPNR, while 35.39% was obtained in the fifth enrichment consortium with NR after 14 days of incubation. Nitrogen content and fatty acid content determined by Kjeldahl method and fourier transform infrared spectroscopy (FTIR), respectively, were decreased significantly after being incubated with the consortia. Structure of degraded rubber film analyzed by nuclear magnetic resonance spectroscopy showed the presence of aldehyde group, a sign of rubber degradation. Bacterial cells tightly adhering and embedding into NR and DPNR films were observed by scanning electron microscopy. There were differences in the bacterial composition of the consortia with NR and DPNR, which were determined by metagenomic analysis using 16S rRNA gene sequencing. The phyla Bacteroidetes and Proteobacteria may play a role in the degradation of non-isoprene compounds such as protein or lipid, while the phylum Actinobacteria plays a crucial role in the degradation of rubber hydrocarbon in all consortia.
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Affiliation(s)
- Lan Huong Nguyen
- School of Biotechnology and Food Technology, Hanoi University of Science and Technology, No 1, Dai Co Viet street, Hanoi, Vietnam.
| | - Hoang Dung Nguyen
- School of Biotechnology and Food Technology, Hanoi University of Science and Technology, No 1, Dai Co Viet street, Hanoi, Vietnam
| | - P Thao Tran
- Department of Science of Technology Innovation, Nagaoka University of Technology, Nagaoka, Japan
| | - Thi Thuong Nghiem
- School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam
| | - Thi Thanh Nguyen
- School of Biotechnology and Food Technology, Hanoi University of Science and Technology, No 1, Dai Co Viet street, Hanoi, Vietnam
| | - Viet Linh Dao
- School of Biotechnology and Food Technology, Hanoi University of Science and Technology, No 1, Dai Co Viet street, Hanoi, Vietnam.,Department of Bioengineering, Nagaoka University of Technology, Nagaoka, Japan
| | - Trung Nghia Phan
- School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam
| | - Anh Kim To
- School of Biotechnology and Food Technology, Hanoi University of Science and Technology, No 1, Dai Co Viet street, Hanoi, Vietnam
| | - Masashi Hatamoto
- Department of Science of Technology Innovation, Nagaoka University of Technology, Nagaoka, Japan
| | - Takashi Yamaguchi
- Department of Science of Technology Innovation, Nagaoka University of Technology, Nagaoka, Japan
| | - Daisuke Kasai
- Department of Bioengineering, Nagaoka University of Technology, Nagaoka, Japan
| | - Masao Fukuda
- Department of Bioengineering, Nagaoka University of Technology, Nagaoka, Japan.,Department of Biological Chemistry, Chubu University, Kasugai, Japan
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Nguyen LH, Ong W, Wang K, Wang M, Nizetic D, Chew SY. Effects of miR-219/miR-338 on microglia and astrocyte behaviors and astrocyte-oligodendrocyte precursor cell interactions. Neural Regen Res 2020; 15:739-747. [PMID: 31638099 PMCID: PMC6975139 DOI: 10.4103/1673-5374.266922] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
MiR-219 and miR-338 (miR-219/miR-338) are oligodendrocyte-specific microRNAs. The overexpression of these miRs in oligodendrocyte precursor cells promotes their differentiation and maturation into oligodendrocytes, which may enhance axonal remyelination after nerve injuries in the central nervous system (CNS). As such, the delivery of miR-219/miR-338 to the CNS to promote oligodendrocyte precursor cell differentiation, maturation and myelination could be a promising approach for nerve repair. However, nerve injuries in the CNS also involve other cell types, such as microglia and astrocytes. Herein, we investigated the effects of miR-219/miR-338 treatment on microglia and astrocytes in vitro and in vivo. We found that miR-219/miR-338 diminished microglial expression of pro-inflammatory cytokines and suppressed astrocyte activation. In addition, we showed that miR-219/miR-338 enhanced oligodendrocyte precursor cell differentiation and maturation in a scratch assay paradigm that re-created a nerve injury condition in vitro. Collectively, our results suggest miR-219/miR-338 as a promising treatment for axonal remyelination in the CNS following nerve injuries. All experimental procedures were approved by the Institutional Animal Care and Use Committee (IACUC), Nanyang Technological University (approval No. A0309 and A0333) on April 27, 2016 and October 8, 2016.
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Affiliation(s)
- Lan Huong Nguyen
- School of Chemical and Biomedical Engineering, Nanyang Technological University; Current address: NUS Synthetic Biology for Clinical and Technological Innovation (SynCTI), Life Sciences Institute, National University of Singapore, Singapore
| | - William Ong
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
| | - Kai Wang
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
| | - Mingfeng Wang
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
| | - Dean Nizetic
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore; Blizard Institute, Barts & The London School of Medicine, Queen Mary University of London, London, UK
| | - Sing Yian Chew
- School of Chemical and Biomedical Engineering; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore
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21
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Van HT, Nguyen LH, Hoang TK, Tran TP, Vo AT, Pham T, Nguyen X. Using FeO-constituted iron slag wastes as heterogeneous catalyst for Fenton and ozonation processes to degrade Reactive Red 24 from aqueous solution. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.05.048] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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22
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Van HT, Nguyen LH, Nguyen VD, Nguyen XH, Nguyen TH, Nguyen TV, Vigneswaran S, Rinklebe J, Tran HN. Characteristics and mechanisms of cadmium adsorption onto biogenic aragonite shells-derived biosorbent: Batch and column studies. J Environ Manage 2019; 241:535-548. [PMID: 30318157 DOI: 10.1016/j.jenvman.2018.09.079] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 09/09/2018] [Accepted: 09/22/2018] [Indexed: 06/08/2023]
Abstract
Calcium carbonate (CaCO3)-enriched biomaterial derived from freshwater mussel shells (FMS) was used as a non-porous biosorbent to explore the characteristics and mechanisms of cadmium adsorption in aqueous solution. The adsorption mechanism was proposed by comparing the FMS properties before and after adsorption alongside various adsorption studies. The FMS biosorbent was characterized using nitrogen adsorption/desorption isotherm, X-ray diffraction, scanning electron microscopy with energy dispersive spectroscopy, Fourier-transform infrared spectroscopy, and point of zero charge. The results of batch experiments indicated that FMS possessed an excellent affinity to Cd(II) ions within solutions pH higher than 4.0. An increase in ionic strength resulted in a significant decrease in the amount of Cd(II) adsorbed onto FMS. Kinetic study demonstrated that the adsorption process quickly reached equilibrium at approximately 60 min. The FMS biosorbent exhibited the Langmuir maximum adsorption capacity as follows: 18.2 mg/g at 10 °C < 26.0 mg/g at 30 °C < 28.6 mg/g at 50 °C. The Cd(II) adsorption process was irreversible, spontaneous (-ΔG°), endothermic (+ΔH°), and more random (+ΔS°). Selective order (mmol/g) of metal cations followed as Pb2+ > Cd2+ > Cu2+ > Cr3+ > Zn2+. For column experiments, the highest Thomas adsorption capacity (7.86 mg/g) was achieved at a flow rate (9 mL/min), initial Cd(II) concentration (10 mg/L), and bed height (5 cm). The Cd(II) removal by FMS was regarded as non-activated chemisorption that occurred very rapidly (even at a low temperature) with a low magnitude of activation energy. Primary adsorption mechanism was surface precipitation. Cadmium precipitated in the primary (Cd,Ca)CO3 form with a calcite-type structure on the FMS surface. A crust of rhombohedral crystals on the substrate was observed by SEM. Freshwater mussel shells have the potential as a renewable adsorbent to remove cadmium from water.
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Affiliation(s)
- Huu Tap Van
- Faculty of Natural Resources and Environment, Thai Nguyen University of Sciences (TNUS), Tan Thinh Ward, Thai Nguyen City, Vietnam
| | - Lan Huong Nguyen
- Faculty of Environment, Natural Resources and Climate Change, Ho Chi Minh City University of Food Industry (HUFI), 140 Le Trong Tan Street, Tay Thanh Ward, Tan Phu District, Ho Chi Minh City, Vietnam
| | - Van Dang Nguyen
- Faculty of Physic and Technology, Thai Nguyen University of Sciences (TNUS), Tan Thinh Ward, Thai Nguyen City, Vietnam
| | - Xuan Hoan Nguyen
- Faculty of Environment, Natural Resources and Climate Change, Ho Chi Minh City University of Food Industry (HUFI), 140 Le Trong Tan Street, Tay Thanh Ward, Tan Phu District, Ho Chi Minh City, Vietnam
| | - Thanh Hai Nguyen
- Faculty of Environment, Thai Nguyen University of Agriculture and Forestry (TUAF), Thai Nguyen City, Vietnam
| | - Tien Vinh Nguyen
- Faculty of Engineering and IT, University of Technology, Sydney (UTS), Sydney, Australia
| | | | - Jörg Rinklebe
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany; Department of Environment, Energy and Geoinformatics, Sejong University, Seoul 05006, South Korea
| | - Hai Nguyen Tran
- Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
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23
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Affiliation(s)
- Lan Huong Nguyen
- Institute for Mathematical and Computational Engineering, Stanford University, Stanford, California, United States of America
| | - Susan Holmes
- Department of Statistics, Stanford University, Stanford, California, United States of America
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24
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Chu HT, Godin I, Phuong NT, Nguyen LH, Hiep TTM, Michel O. Allergen sensitisation among chronic respiratory diseases in urban and rural areas of the south of Viet Nam. Int J Tuberc Lung Dis 2019; 22:221-229. [PMID: 29506620 DOI: 10.5588/ijtld.17.0069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE To evaluate the prevalence of and risk factors for allergen sensitisation among patients with chronic respiratory disease (CRD) in southern Viet Nam. DESIGN An environmental questionnaire and skin prick tests for airborne and food allergens were administered to patients with CRD, defined as individuals with respiratory symptoms and lung function defects. RESULTS Of 610 CRD patients, 56% had chronic obstructive pulmonary disease and 31% were asthma patients; 80% were males. The most frequent sensitisers were dust mites (Dermatophagoides farinae 22%, Blomia tropicalis 19%, D. pteronyssinus 18%) and cockroach droppings (13%). Among study participants, 37% were from rural settings and 36% from urban areas, whereas 27% had migrated from rural to urban areas. Compared with people from rural areas, being born in an urban area was a risk factor for sensitisation to mites (OR 1.56, 95%CI 1.11-2.20, P < 0.02). In multivariate analysis, place of birth remained a risk factor for mite sensitisation. Compared with the native urban population, the risk of mite sensitisation was not significantly different among patients born in rural areas and those migrating to urban areas. CONCLUSION Dust mites and cockroach droppings were the most frequent allergens among people with CRD in the south of Viet Nam. Compared with the urban population, being native to a rural area was protective against mite sensitisation, but this effect ceased to be significant after migration from rural to urban areas.
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Affiliation(s)
- H T Chu
- Pham Ngoc Thach Hospital, Ho Chi Minh City, Viet Nam
| | - I Godin
- School of Public Health, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - N T Phuong
- Pham Ngoc Thach Hospital, Ho Chi Minh City, Viet Nam
| | - L H Nguyen
- Pham Ngoc Thach Hospital, Ho Chi Minh City, Viet Nam
| | - T T M Hiep
- Department of Paediatrics, Pham Ngoc Thach University of Medicine, Ho Chi Minh City, Viet Nam
| | - O Michel
- Clinic of Immuno-Allergology, Centre Hospitalier Universitaire Brugmann, ULB, Brussels, Belgium
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25
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Nguyen LH, Vu TM, Le TT, Trinh VT, Tran TP, Van HT. Ammonium removal from aqueous solutions by fixed-bed column using corncob-based modified biochar. Environ Technol 2019; 40:683-692. [PMID: 29161983 DOI: 10.1080/09593330.2017.1404134] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 10/26/2017] [Indexed: 06/07/2023]
Abstract
This study investigated the potential of removing ammonium ([Formula: see text]) from aqueous solutions using corncob based on modified biochar (MBCC) in the fixed-bed column. Corncob biochar was soaked in a mixture of HNO3 6.0 M and NaOH 0.3 M to prepare active binding sites for ammonium removal. The effect of initial ammonium concentrations (10-40 mg/L), flow rates (1-9 mL/min) and MBCC fixed-bed heights (8-24 cm) on the breakthrough characteristics of the adsorption system were studied. The results showed that the highest adsorption capacity of fix-bed column, the breakthrough time and value of Ct/Co were 12.83 mg/g, 480 min and 0.862 ± 0.025 at 10 mg/L of initial ammonium concentration, 8 cm of MBCC fixed-bed height and 3 mL/min of flow rate, respectively. The breakthrough curve model in this study also indicated that all Yoon-Nelson, Thomas and Adam-Bohart models well fit with the experimental data with a high R2. The results also proved that MBCC can be used as a potential adsorbent for eliminating [Formula: see text] in the fixed-bed column. The saturated MBCC was also regenerated and reused consecutively for four cycles. The usage of mixture of NaOH and NaCl in recovering MBCC was better than NaCl only.
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Affiliation(s)
- Lan Huong Nguyen
- a Faculty of Biotechnology and Environmental Engineering , Ho Chi Minh City University of Food Industry (HUFI) , Ho Chi Minh City , Viet Nam
| | - Thi Mai Vu
- b Hanoi University of Natural Resources and Environment , Ha Noi , Viet Nam
| | - Thi Trinh Le
- b Hanoi University of Natural Resources and Environment , Ha Noi , Viet Nam
| | - Van Tuyen Trinh
- c Institute of Environmental Technology (IET) , Vietnam Academy of Science and Technology , Ha Noi , Viet Nam
| | - Thi Pha Tran
- d Faculty of Environment , Thai Nguyen University of Agriculture and Forestry , Thai Nguyen city , Viet Nam
| | - Huu Tap Van
- e Faculty of Environment and Earth Science , Thai Nguyen University of Sciences (TNUS) , Thai Nguyen city , Viet Nam
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26
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Hoang LP, Van HT, Nguyen LH, Mac DH, Vu TT, Ha LT, Nguyen XC. Removal of Cr(vi) from aqueous solution using magnetic modified biochar derived from raw corncob. NEW J CHEM 2019. [DOI: 10.1039/c9nj02661d] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetic modified-corncob biochar with an impregnation ratio of iron at 20% (w/w) was used for removal of Cr(vi) from aqueous solution.
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Affiliation(s)
- Le Phuong Hoang
- Faculty of Civil and Environmental Engineering
- Thai Nguyen University of Technology (TNUT)
- Tich Luong Ward
- Vietnam
| | - Huu Tap Van
- Faculty of Natural Resources and Environment
- Thai Nguyen University of Sciences (TNUS)
- Tan Thinh Ward
- Vietnam
| | - Lan Huong Nguyen
- Faculty of Environment – Natural Resources and Climate Change
- Ho Chi Minh City University of Food Industry (HUFI)
- 140 Le Trong Tan Street, Tay Thanh Ward, Tan Phu District
- Ho Chi Minh City
- Vietnam
| | - Duy-Hung Mac
- Faculty of Civil and Environmental Engineering
- Thai Nguyen University of Technology (TNUT)
- Tich Luong Ward
- Vietnam
| | - Thuy Trang Vu
- Faculty of Civil and Environmental Engineering
- Thai Nguyen University of Technology (TNUT)
- Tich Luong Ward
- Vietnam
| | - L. T. Ha
- Institute of Research and Development
- Duy Tan University
- Da Nang 550000
- Vietnam
| | - X. C. Nguyen
- Laboratory of Advanced Materials Chemistry
- Advanced Institute of Materials Science
- Ton Duc Thang University
- Ho Chi Minh City
- Vietnam
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27
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Nguyen LH, Gao M, Lin J, Wu W, Wang J, Chew SY. Author Correction: Three-dimensional aligned nanofibers-hydrogel scaffold for controlled non-viral drug/gene delivery to direct axon regeneration in spinal cord injury treatment. Sci Rep 2018; 8:13057. [PMID: 30143711 PMCID: PMC6109186 DOI: 10.1038/s41598-018-31314-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Lan Huong Nguyen
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore
| | - Mingyong Gao
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore.,Department of Spine Surgery, Renmin Hospital of Wuhan University, Wuhan, 430060, China.,Department of spinal surgery, Renmin Hospital of Wuhan University, Wuhan, 430060, PR China
| | - Junquan Lin
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore
| | - Wutian Wu
- School of Biomedical Sciences, The University of Hong Kong Li Ka Shing Faculty of Medicine, Pokfulam, Hong Kong SAR, China.,Research Center of Reproduction, Development and Growth, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR, China.,State Key Laboratory of Brain and Cognitive Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR, China.,Guangdong-Hongkong-Macau Institute of CNS Regeneration, Jinan University, Guangzhou, 510632, PR China
| | - Jun Wang
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences and Medical Center, University of Science & Technology of China, Hefei, Anhui, 230027, PR China
| | - Sing Yian Chew
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore. .,Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, 308232, Singapore.
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28
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Goel A, Rahim U, Nguyen LH, Stave C, Nguyen MH. Systematic review with meta-analysis: rifaximin for the prophylaxis of spontaneous bacterial peritonitis. Aliment Pharmacol Ther 2017; 46:1029-1036. [PMID: 28994123 DOI: 10.1111/apt.14361] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 06/12/2017] [Accepted: 09/14/2017] [Indexed: 12/11/2022]
Abstract
BACKGROUND The primary and secondary prevention of spontaneous bacterial peritonitis (SBP) is recommended in high-risk patients with cirrhosis. Several studies evaluating the efficacy of rifaximin for SBP prophylaxis have yielded conflicting results. Rifaximin has the potential advantage of preventing bacterial overgrowth and translocation without the systemic side effects of broad-spectrum antibiotics. AIM To evaluate the efficacy of rifaximin in the primary and secondary prevention of SBP. METHODS A literature search using five databases was performed to identify studies on the association between rifaximin and SBP. We performed two meta-analyses: (1) rifaximin compared to systemic antibiotics and (2) rifaximin compared to no antibiotics. Random-effect modelling was conducted to determine overall pooled estimates and 95% confidence intervals (CIs). RESULTS Five studies with 555 patients (295 rifaximin, 260 systemic antibiotics) compared rifaximin with systemic antibiotics. The pooled odds ratio (OR) for SBP was 0.45 (95% CI 0.16-1.27; P = .13) in patients receiving rifaximin and strengthened on sensitivity analysis (OR 0.38, 95% CI 0.19-0.76, P = .01). In the analysis comparing rifaximin with no antibiotics, there were five studies with 784 patients (186 rifaximin, 598 no antibiotics). The OR for SBP was 0.34 (95% CI 0.11-0.99; P < .05) in patients receiving rifaximin. In subgroup analysis, rifaximin reduced the risk of SBP by 47% compared to no antibiotics for primary prophylaxis and by 74% compared to systemic antibiotics for secondary prophylaxis. CONCLUSION Rifaximin may be effective in preventing SBP in patients with cirrhosis and ascites compared to systemically absorbed antibiotics and compared to placebo.
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Affiliation(s)
- A Goel
- Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
| | - U Rahim
- Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
| | - L H Nguyen
- Gastrointestinal Unit, Massachusetts General Hospital, Boston, MA, USA
| | - C Stave
- Lane Medical Library, Stanford University School of Medicine, Stanford, CA, USA
| | - M H Nguyen
- Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
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Abstract
BACKGROUND Detecting patterns in high-dimensional multivariate datasets is non-trivial. Clustering and dimensionality reduction techniques often help in discerning inherent structures. In biological datasets such as microbial community composition or gene expression data, observations can be generated from a continuous process, often unknown. Estimating data points' 'natural ordering' and their corresponding uncertainties can help researchers draw insights about the mechanisms involved. RESULTS We introduce a Bayesian Unidimensional Scaling (BUDS) technique which extracts dominant sources of variation in high dimensional datasets and produces their visual data summaries, facilitating the exploration of a hidden continuum. The method maps multivariate data points to latent one-dimensional coordinates along their underlying trajectory, and provides estimated uncertainty bounds. By statistically modeling dissimilarities and applying a DiSTATIS registration method to their posterior samples, we are able to incorporate visualizations of uncertainties in the estimated data trajectory across different regions using confidence contours for individual data points. We also illustrate the estimated overall data density across different areas by including density clouds. One-dimensional coordinates recovered by BUDS help researchers discover sample attributes or covariates that are factors driving the main variability in a dataset. We demonstrated usefulness and accuracy of BUDS on a set of published microbiome 16S and RNA-seq and roll call data. CONCLUSIONS Our method effectively recovers and visualizes natural orderings present in datasets. Automatic visualization tools for data exploration and analysis are available at: https://nlhuong.shinyapps.io/visTrajectory/ .
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Affiliation(s)
- Lan Huong Nguyen
- Institute for Computational and Mathematical Engineering, Stanford University, Stanford, 94305 USA
| | - Susan Holmes
- Department of Statistics, Stanford University, Stanford, 94305 USA
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Wu X, Tan YJ, Toh HT, Nguyen LH, Kho SH, Chew SY, Yoon HS, Liu XW. Stimuli-responsive multifunctional glyconanoparticle platforms for targeted drug delivery and cancer cell imaging. Chem Sci 2017; 8:3980-3988. [PMID: 28553540 PMCID: PMC5433505 DOI: 10.1039/c6sc05251g] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 03/17/2017] [Indexed: 12/12/2022] Open
Abstract
Targeted bioimaging or chemotherapeutic drug delivery to achieve the desired therapeutic effects while minimizing side effects has attracted considerable research attention and remains a clinical challenge. Presented herein is a multi-component delivery system based on carbohydrate-functionalized gold nanoparticles conjugated with a fluorophore or prodrug. The system leverages active targeting based on carbohydrate-lectin interactions and release of the payload by biological thiols. Cell-type specific delivery of the activatable fluorophore was examined by confocal imaging on HepG2 cells, and displays distinct selectivity towards HepG2 cells over HeLa and NIH3T3 cells. The system was further developed into a drug delivery vehicle with camptothecin (CPT) as a model drug. It was demonstrated that the complex exhibits similar cytotoxicity to that of free CPT towards HepG2 cells, and is significantly less cytotoxic to normal HDF and NIH3T3 cells, indicating excellent specificity. The delivery vehicle itself exhibits excellent biocompatibility and offers an attractive strategy for cell-type specific delivery depending on the carbohydrates conjugated in the system.
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Affiliation(s)
- Xumeng Wu
- Division of Chemistry and Biological Chemistry , School of Physical & Mathematical Sciences , Nanyang Technological University , 21 Nanyang Link , Singapore 637371 , Singapore .
| | - Yu Jia Tan
- Division of Chemistry and Biological Chemistry , School of Physical & Mathematical Sciences , Nanyang Technological University , 21 Nanyang Link , Singapore 637371 , Singapore .
| | - Hui Ting Toh
- Division of Structural Biology & Biochemistry , School of Biological Sciences , Nanyang Technological University , Singapore 639798 , Singapore
| | - Lan Huong Nguyen
- School of Chemical & Biomedical Engineering , Nanyang Technological University , Singapore 637459 , Singapore
| | - Shu Hui Kho
- Division of Chemistry and Biological Chemistry , School of Physical & Mathematical Sciences , Nanyang Technological University , 21 Nanyang Link , Singapore 637371 , Singapore .
| | - Sing Yian Chew
- School of Chemical & Biomedical Engineering , Nanyang Technological University , Singapore 637459 , Singapore
- Lee Kong Chian School of Medicine , Nanyang Technological University , Singapore 308232 , Singapore
| | - Ho Sup Yoon
- Division of Structural Biology & Biochemistry , School of Biological Sciences , Nanyang Technological University , Singapore 639798 , Singapore
- Department of Genetic Engineering , College of Life Sciences , Kyung Hee University , Yongin-si , Gyeonggi-do 446-701 , Republic of Korea
| | - Xue-Wei Liu
- Division of Chemistry and Biological Chemistry , School of Physical & Mathematical Sciences , Nanyang Technological University , 21 Nanyang Link , Singapore 637371 , Singapore .
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Nguyen LH, Gao M, Lin J, Wu W, Wang J, Chew SY. Three-dimensional aligned nanofibers-hydrogel scaffold for controlled non-viral drug/gene delivery to direct axon regeneration in spinal cord injury treatment. Sci Rep 2017; 7:42212. [PMID: 28169354 PMCID: PMC5294639 DOI: 10.1038/srep42212] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 01/06/2017] [Indexed: 01/07/2023] Open
Abstract
Spinal cord injuries (SCI) often lead to persistent neurological dysfunction due to failure in axon regeneration. Unfortunately, currently established treatments, such as direct drug administration, do not effectively treat SCI due to rapid drug clearance from our bodies. Here, we introduce a three-dimensional aligned nanofibers-hydrogel scaffold as a bio-functionalized platform to provide sustained non-viral delivery of proteins and nucleic acid therapeutics (small non-coding RNAs), along with synergistic contact guidance for nerve injury treatment. A hemi-incision model at cervical level 5 in the rat spinal cord was chosen to evaluate the efficacy of this scaffold design. Specifically, aligned axon regeneration was observed as early as one week post-injury. In addition, no excessive inflammatory response and scar tissue formation was triggered. Taken together, our results demonstrate the potential of our scaffold for neural tissue engineering applications.
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Affiliation(s)
- Lan Huong Nguyen
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
| | - Mingyong Gao
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
- Department of Spine Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Junquan Lin
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
| | - Wutian Wu
- School of Biomedical Sciences, The University of Hong Kong Li Ka Shing Faculty of Medicine, Pokfulam, Hong Kong SAR, China
- Research Center of Reproduction, Development and Growth, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR, China
- State Key Laboratory of Brain and Cognitive Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR, China
- Guangdong-Hongkong-Macau Institute of CNS Regeneration, Jinan University, Guangzhou 510632, PR China
| | - Jun Wang
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences and Medical Center, University of Science & Technology of China, Hefei, Anhui 230027, PR China
| | - Sing Yian Chew
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore
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Milbreta U, Nguyen LH, Diao H, Lin J, Wu W, Sun CY, Wang J, Chew SY. Three-Dimensional Nanofiber Hybrid Scaffold Directs and Enhances Axonal Regeneration after Spinal Cord Injury. ACS Biomater Sci Eng 2016; 2:1319-1329. [DOI: 10.1021/acsbiomaterials.6b00248] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ulla Milbreta
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 637459, Singapore
| | - Lan Huong Nguyen
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 637459, Singapore
| | - Huajia Diao
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 637459, Singapore
| | - Junquan Lin
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 637459, Singapore
| | - Wutian Wu
- Department
of Anatomy, The University of Hong Kong, Li Ka Shing Faculty of Medicine, Pokfulam, Hong Kong SAR, China
- Research
Center of Reproduction, Development and Growth, Li Ka Shing Faculty
of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR, China
- State
Key Laboratory of Brain and Cognitive Sciences, Li Ka Shing Faculty
of Medicine, The University of Hong Kong, Pokfulam, Hong Kong SAR, China
- Guangdong-Hongkong-Macau
Institute of CNS Regeneration, Jinan University, Guangzhou 510632, P. R. China
| | - Chun-Yang Sun
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences and Medical Center, University of Science & Technology of China, Hefei, Anhui 230027, P. R. China
| | - Jun Wang
- The CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences and Medical Center, University of Science & Technology of China, Hefei, Anhui 230027, P. R. China
| | - Sing Yian Chew
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 637459, Singapore
- Lee
Kong Chian School of Medicine, Nanyang Technological University, 308232, Singapore
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Nguyen YTT, Nguyen TB, Nguyen TP, Nguyen TH, Vu HH, Nguyen TV, Pham TH, Do TT, Duong HT, Nguyen LH, Partridge JM, Kile JC, Iuliano A, Nguyen HT. Healthcare seeking behavior for respiratory illness in a northern province of Vietnam. Antimicrob Resist Infect Control 2015. [PMCID: PMC4474730 DOI: 10.1186/2047-2994-4-s1-p16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Nguyen LH, Diao HJ, Chew SY. MicroRNAs and their potential therapeutic applications in neural tissue engineering. Adv Drug Deliv Rev 2015; 88:53-66. [PMID: 25980934 DOI: 10.1016/j.addr.2015.05.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2015] [Revised: 05/08/2015] [Accepted: 05/10/2015] [Indexed: 01/01/2023]
Abstract
The inherent poor regeneration capacity of nerve tissues, especially in the central nervous system, poses a grand challenge for neural tissue engineering. After injuries, the local microenvironment often contains potent inhibitory molecules and glial scars, which do not actively support axonal regrowth. MicroRNAs can direct fate of neural cells and are tightly controlled during nerve development. Thus, RNA interference using microRNAs is a promising method to enhance nerve regeneration. Although the physiological roles of microRNA expression levels in various cellular activities or disease conditions have been extensively investigated, the translational use of these understanding for neural tissue engineering remains limited. This review aims to highlight essential microRNAs that participate in cellular behaviors within the adult nervous system and their potential therapeutic applications. In addition, possible delivery methods are also suggested for effective gene silencing in neural tissue engineering.
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Affiliation(s)
- Lan Huong Nguyen
- Division of Chemical and Biomolecular Engineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
| | - Hua Jia Diao
- Division of Chemical and Biomolecular Engineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
| | - Sing Yian Chew
- Division of Chemical and Biomolecular Engineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore.
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Chao DT, Lim JK, Ayoub WS, Nguyen LH, Nguyen MH. Systematic review with meta-analysis: the proportion of chronic hepatitis B patients with normal alanine transaminase ≤ 40 IU/L and significant hepatic fibrosis. Aliment Pharmacol Ther 2014; 39:349-58. [PMID: 24387289 DOI: 10.1111/apt.12590] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 07/10/2013] [Accepted: 12/01/2013] [Indexed: 12/17/2022]
Abstract
BACKGROUND Chronic hepatitis B (CHB) may lead to cirrhosis, hepatocellular carcinoma and premature death. Elevated alanine transaminase (ALT) levels ≥ the upper limit of normal (ULN) are a major determinant for initiating anti-viral therapy; however, ALT levels alone may not be predictive of hepatic fibrosis. AIM To determine the proportion of CHB patients with ALT ≤ 40 IU/L and liver fibrosis stage ≥ 2. Secondary goals include subgroup analysis by hepatitis B e antigen (HBeAg) status, high hepatitis B virus (HBV) DNA levels, Asian ethnicity, lower ULN of ≤ 30 IU/L (males) and 19 IU/L (females), and advanced age. METHODS Studies identified in EMBASE and MEDLINE (1/1990-6/2012) using the search criteria: "Hepatitis B"[Mesh] OR "Hepatitis B virus"[Mesh] OR "Hepatitis B, Chronic"[Mesh])) AND "Alanine Transaminase"[Mesh]) and abstracts containing the term 'hepatitis' from recent major U.S. gastroenterology and liver society meetings were considered. RESULTS Among nine studies (N = 830 patients), a significant proportion (20.7%; 95% CI: 16.2-26.0%) of CHB patients with ALT levels ≤ 40 IU/L had significant fibrosis irrespective of HBeAg status, high HBV DNA levels, ethnicity or age, although this proportion may be higher in patients older than 30-40 years old. The corresponding proportion was 27.8% even when the newer ULN of 30 IU/L (males) and 19 IU/L (females) was applied. CONCLUSIONS Approximately one fifth of CHB patients with ALT ≤ 40 IU/L may have significant hepatic fibrosis. The approach to such patients should be individualised, as further evaluation and treatment may be appropriate.
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Affiliation(s)
- D T Chao
- Department of Internal Medicine, University of Pittsburgh Medical Center, Shadyside, Pittsburgh, PA, USA
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36
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Nguyen LH, Nguyen MH. Systematic review: Asian patients with chronic hepatitis C infection. Aliment Pharmacol Ther 2013; 37:921-36. [PMID: 23557103 DOI: 10.1111/apt.12300] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2012] [Revised: 10/16/2012] [Accepted: 03/12/2013] [Indexed: 12/14/2022]
Abstract
BACKGROUND Chronic hepatitis C (CHC) infection is a risk factor for both the development of end-stage liver disease and hepatocellular carcinoma (HCC). Globally, approximately 170 million people are chronically infected with the hepatitis C virus (HCV), and the majority of these individuals come from the western Pacific and Southeast Asia regions (94.6 million persons combined). CHC is an understudied and underappreciated health problem in many Asian countries and in the US, where Asians represent one of the fastest growing groups of new Americans. AIM To perform a systematic review of the current literature on the epidemiology, diagnosis and screening, clinical characteristics and response to anti-viral therapy of Asians with CHC. METHODS Using a PubMed search of 'hepatitis C' and 'Asia,' 341 original manuscripts published in peer-reviewed journals were identified, and 99 were selected based on their relevance. RESULTS Many Asian CHC patients do not have easily identifiable risk factors and may be underdiagnosed. Rates of HCV infection in Asians on community screening in the US are unexpectedly high, and there is a high prevalence of HCV genotype 6 in Southeast Asia and Southern China. HCV-infected Asians tend to present at older age and may have higher risk of HCC; however, they respond better to anti-viral therapy than non-Asians across all HCV genotypes. CONCLUSIONS Given the high HCV endemicity in Asia, lack of identifiable risk factors and favourable treatment response rates in Asians, we advocate the screening for HCV infection of all Asians who come from areas where HCV prevalence is ≥2%.
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Affiliation(s)
- L H Nguyen
- Stanford University School of Medicine, Stanford, CA, USA
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Passmore JW, Nguyen LH, Nguyen NP, Olivé JM. The formulation and implementation of a national helmet law: a case study from Viet Nam. Bull World Health Organ 2010; 88:783-7. [PMID: 20931064 DOI: 10.2471/blt.09.071662] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2009] [Revised: 02/04/2010] [Accepted: 02/15/2010] [Indexed: 11/27/2022] Open
Abstract
PROBLEM Road traffic injuries are a leading cause of death and disability in Viet Nam. In 2008, official data reported 11 243 deaths and 7771 serious injuries on the roads, of which an estimated 60% of fatalities occur in motorcycle riders and passengers. In recognition of this problem, Viet Nam has had partial motorcycle helmet legislation since 1995. However, for a variety of reasons, implementation and enforcement have been limited. APPROACH On 15 December 2007, Viet Nam's first comprehensive mandatory helmet law came into effect, covering all riders and passengers on all roads nationwide. Penalties increased ten-fold and cohorts of police were mobilized for enforcement. LOCAL SETTING The Viet Nam national helmet legislation was developed and implemented by the National Traffic Safety Committee. RELEVANT CHANGES Despite past barriers to enforcement, increased policing in 2008 led to 680 000 infringements being issued for non-helmet wearing. While changes in helmet wearing were not nationally observed, significant increases were documented in selected provinces in the first six months of the law's introduction. In Da Nang, helmet wearing increased from 27 to 99%. In the first three months after the law took effect, surveillance data from 20 urban and rural hospitals, found the risk of road traffic head injuries and deaths decreased by 16% and 18% respectively. LESSONS LEARNT Political leadership, intensive advanced public education and stringent enforcement have contributed to the successful implementation of the new law. Through continual monitoring of the legislation, loopholes detrimental to the effectiveness of the law have been identified and addressed.
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Nguyen MH, Garcia RT, Trinh HN, Nguyen HA, Nguyen KK, Nguyen LH, Levitt B. Prevalence of hepatitis B virus DNA polymerase mutations in treatment-naïve patients with chronic hepatitis B. Aliment Pharmacol Ther 2009; 30:1150-8. [PMID: 19785624 DOI: 10.1111/j.1365-2036.2009.04151.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND One of the most important factors in treatment failure using nucleos(t)ide analogues in chronic hepatitis B is anti-viral resistance. Primary drug resistance refers to amino acid changes in the hepatitis B virus polymerase/reverse transcriptase (rt) that result in reduced susceptibility to anti-viral agents. Pre-existing drug resistance mutations may occur in untreated patients and may affect their treatment outcomes. AIM To determine the prevalence of hepatitis B DNA polymerase mutations in treatment-naïve patients. METHODS We used a direct PCR sequencing test to detect DNA polymerase mutations in 472 consecutive treatment-naïve patients at two community gastroenterology clinics in Northern California. RESULTS A majority of patients were Asians (>95%), had either genotype B or C (95%) and had no evidence of cirrhosis or liver cancer (94%). Mean age was 45 +/- 13 and mean hepatitis B virus DNA was 5.3 +/- 1.8 log(10) IU/mL. Most patients did not have any detectable mutations (82.4%). Some (16.7%) had mutations of unknown clinical significance (rtV207M/L/I) and only 4 patients had rtA181A/S, rtA194S or M250I. CONCLUSIONS No rtM204V/I or rtN236T mutations were observed in our study. Less than 1% of our patients had mutations that can be associated with primary resistance to existing anti-viral therapies for hepatitis B virus.
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Affiliation(s)
- M H Nguyen
- Division of Gastroenterology and Hepatology, Stanford University Medical Center, Stanford, CA 94304, USA.
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Affiliation(s)
- A Yoskovitch
- Department of Otolaryngology-Head and Neck Surgery, Sir Mortimer B. Davis-Jewish General Hospital, 3755 Cote Sainte Catherine Road, Suite E-209, Montreal, Quebec, Canada H3T 1E2
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Abstract
Although more than 30 Escherichia coli promoters utilize the RNA polymerase holoenzyme containing sigmaS (EsigmaS), and it is known that there is some overlap between the promoters recognized by EsigmaS and by the major E. coli holoenzyme (Esigma70), the sequence elements responsible for promoter recognition by EsigmaS are not well understood. To define the DNA sequences recognized best by EsigmaS in vitro, we started with random DNA and enriched for EsigmaS promoter sequences by multiple cycles of binding and selection. Surprisingly, the sequences selected by EsigmaS contained the known consensus elements (-10 and -35 hexamers) for recognition by Esigma70. Using genetic and biochemical approaches, we show that EsigmaS and Esigma70 do not achieve specificity through 'best fit' to different consensus promoter hexamers, the way that other forms of holoenzyme limit transcription to discrete sets of promoters. Rather, we suggest that EsigmaS-specific promoters have sequences that differ significantly from the consensus in at least one of the recognition hexamers, and that promoter discrimination against Esigma70 is achieved, at least in part, by the two enzymes tolerating different deviations from consensus. DNA recognition by EsigmaS versus Esigma70 thus presents an alternative solution to the problem of promoter selectivity.
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Affiliation(s)
- T Gaal
- Department of Bacteriology, University of Wisconsin, Madison WI 53706, USA
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Nguyen LH, Espert L, Mechti N, Wilson DM. The human interferon- and estrogen-regulated ISG20/HEM45 gene product degrades single-stranded RNA and DNA in vitro. Biochemistry 2001; 40:7174-9. [PMID: 11401564 DOI: 10.1021/bi010141t] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The human ISG20/HEM45 gene was identified independently on the basis of its increased level of expression in response to either interferon or estrogen hormone. Notably, the encoded protein is homologous with members of the 3' to 5' exonuclease superfamily that includes RNases T and D, and the proofreading domain of Escherichia coli DNA polymerase I. We provide here direct biochemical evidence that Isg20 acts as a 3' to 5' exonuclease in vitro. This protein displays a pH optimum of approximately 7.0, prefers Mn2+ as a metal cofactor, and degrades RNA at a rate that is approximately 35-fold higher than its rate for single-stranded DNA. Along with RNase L, Isg20 is the second known RNase regulated by interferon. Previous data showed that Isg20 is located in promyelocytic leukemia (PML) nuclear bodies, known sites of hormone-dependent RNA polymerase II transcription and oncogenic DNA viral transcription and replication. The combined data suggest a potential role for Isg20 in degrading viral RNAs as part of the interferon-regulated antiviral response and/or cellular mRNAs as a regulatory component of interferon and estrogen signaling.
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Affiliation(s)
- L H Nguyen
- Molecular and Structural Biology Division, Lawrence Livermore National Laboratory, P.O. Box 808, L-441, Livermore, California 94551, USA
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Thelmo MC, Morita ET, Treseler PA, Nguyen LH, Allen RE, Sagebiel RW, Kashani-Sabet M, Leong SP. Micrometastasis to in-transit lymph nodes from extremity and truncal malignant melanoma. Ann Surg Oncol 2001; 8:444-8. [PMID: 11407520 DOI: 10.1007/s10434-001-0444-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND The sentinel lymph node (SLN) is the first lymph node in the regional nodal basin to receive metastatic cells. In-transit nodes are found between the primary melanoma site and regional nodal basins. To date, this is one of the first reports on micrometastasis to in-transit nodes. METHODS Retrospective database and medical records were reviewed from October 21, 1993, to November 19. 1999. At the UCSF Melanoma Center, patients with tumor thickness > 1 mm or < 1 mm with high-risk features are managed with preoperative lymphoscintigraphy, selective SLN dissection, and wide local excision. RESULTS Thirty (5%) out of 557 extremity and truncal melanoma patients had in-transit SLNs. Three patients had positive in-transit SLNs and negative SLNs in the regional nodal basin. Two patients had positive in-transit and regional SLNs. Three patients had negative in-transit SLNs but positive regional SLNs. The remaining 22 patients were negative for in-transit and regional SLNs. CONCLUSIONS In-transit SLNs may harbor micrometastasis. About 10% of the time, micrometastasis may involve the in-transit and not the regional SLN. Therefore, both in-transit and regional SLNs should be harvested.
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Affiliation(s)
- M C Thelmo
- Department of Surgery, University of California at San Francisco Medical Center at Mount Zion and UCSF Comprehensive Cancer Center, 94115, USA
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Thelmo MC, Sagebiel RW, Treseler PA, Morita ET, Nguyen LH, Kashani-Sabet M, Leong SP. Evaluation of sentinel lymph node status in spindle cell melanomas. J Am Acad Dermatol 2001; 44:451-5. [PMID: 11209114 DOI: 10.1067/mjd.2001.110881] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND The propensity for spindle cell melanoma to metastasize to the lymph node is relatively low despite its relative thick depth. To date, there are no published reports on the sentinel lymph node (SLN) status in patients diagnosed with spindle cell melanoma and desmoplastic malignant melanoma (DMM). OBJECTIVE Our purpose was to report our experience on the SLN status in spindle cell melanoma and DMM. METHODS We undertook a retrospective database and medical record review from Oct 21, 1993 to Sept 29, 1999. At the University of California at San Francisco Melanoma Center, patients with tumor thickness greater than 1 mm or less than 1 mm with high-risk features are managed with preoperative lymphoscintigraphy, selective SLN dissection, and wide excision. RESULTS Of 29 patients diagnosed with spindle cell melanoma and DMM, 28 had negative SLNs and are free of disease except for one patient who experienced splenic, bony, and brain metastases. The mean follow-up in this population was 16.5 and 11 months, respectively. CONCLUSION Our preliminary findings show that SLNs from patients diagnosed with spindle cell melanoma and DMM only rarely harbor micrometastasis despite their relative thickness. A larger number of cases from multicenter databases may further define the true biology of SLNs in this melanoma variant.
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Affiliation(s)
- M C Thelmo
- Department of Surgery, University of California, San Francisco Medical Center at Mount Sinai and UCSF Comprehensive Cancer Center, 94115, USA
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Abstract
At the University of California San Francisco Comprehensive Cancer Center, a computer database system was created using the FileMaker Pro database program. The system allows the clinical team to bring together data from all aspects of a multidisciplinary effort toward improving daily clinical management, for research, and ultimately, for the clinical standard of care for melanoma patients. With modest objectives during the initiation of the database, its adaptability has allowed it to become an integral link in all the efforts of the melanoma program. For the future, tapping into the immense potential of the Internet has begun to organize multicenter efforts. Through nationwide collaboration, the Sentinel Lymph Node Working Group will be able to follow, on a larger scale, the successes of the FileMaker pro database at the UCSF Comprehensive Cancer Center.
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Affiliation(s)
- L H Nguyen
- Department of Surgery, University of California, San Francisco / Mount Zion Medical Center, USA
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45
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Abstract
We report here the identification of human homologues to the essential Escherichia coli Orn protein and the related yeast mitochondrial DNA-escape pathway regulatory factor Ynt20. The human proteins appear to arise from alternatively spliced transcripts, and are thus identical, except the human Ynt20 equivalent contains an NH(2)-terminal extension that possesses a predicted mitochondrial protease cleavage signal. In vitro analysis revealed that the smaller human protein exhibits a 3' to 5' exonuclease activity for small (primarily </=5 nucleotides in length) single-stranded RNA and DNA oligomers. We have named this human protein Sfn for small fragment nuclease to reflect its broad substrate range, and have termed the longer protein hSfnalpha. Sfn prefers Mn(2+) as a metal cofactor and displays a temperature-resistant (to 50 degrees C) nuclease activity. Kinetic analysis indicates that Sfn exhibits a similar affinity for small RNAs and DNAs (K(m) of approximately 1.5 micrometer), but degrades small RNAs approximately 4-fold more efficiently than DNA. Mutation of a conserved aspartate (Asp(136)) to alanine abolishes both nuclease activities of Sfn. Northern blot analysis revealed that a 1-kilobase transcript corresponding to SFN and/or SFNalpha (these mRNAs differ by only two nucleotides) is expressed at varying levels in all fetal and adult human tissues examined. Expressed tag sequence clone analysis found that the two splice variants, SFN to SFNalpha, are present at a ratio of roughly 4 to 1, respectively. The results presented within suggest a role for human Sfn in cellular nucleotide recycling.
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Affiliation(s)
- L H Nguyen
- Molecular and Structural Biology Division, Lawrence Livermore National Laboratory, Livermore, California 94551, USA
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Nguyen LH, Barsky D, Erzberger JP, Wilson DM. Mapping the protein-DNA interface and the metal-binding site of the major human apurinic/apyrimidinic endonuclease. J Mol Biol 2000; 298:447-59. [PMID: 10772862 DOI: 10.1006/jmbi.2000.3653] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Apurinic/apyrimidinic (AP) endonuclease Ape1 is a key enzyme in the mammalian base excision repair pathway that corrects AP sites in the genome. Ape1 cleaves the phosphodiester bond immediately 5' to AP sites through a hydrolytic reaction involving a divalent metal co-factor. Here, site-directed mutagenesis, chemical footprinting techniques, and molecular dynamics simulations were employed to gain insights into how Ape1 interacts with its metal cation and AP DNA. It was found that Ape1 binds predominantly to the minor groove of AP DNA, and that residues R156 and Y128 contribute to protein-DNA complex stability. Furthermore, the Ape1-AP DNA footprint does not change along its reaction pathway upon active-site coordination of Mg(2+) or in the presence of DNA polymerase beta (polbeta), an interactive protein partner in AP site repair. The DNA region immediately 5' to the abasic residue was determined to be in close proximity to the Ape1 metal-binding site. Experimental evidence is provided that amino acid residues E96, D70, and D308 of Ape1 are involved in metal coordination. Molecular dynamics simulations, starting from the active site of the Ape1 crystal structure, suggest that D70 and E96 bind directly to the metal, while D308 coordinates the cation through the first hydration shell. These studies define the Ape1-AP DNA interface, determine the effect of polbeta on the Ape1-DNA interaction, and reveal new insights into the Ape1 active site and overall protein dynamics.
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Affiliation(s)
- L H Nguyen
- Molecular and Structural Biology Division, Lawrence Livermore National Laboratory, Livermore, CA, 94551, USA
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47
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Abstract
The hexane extract of the bark of Garcinia vilersiana from Vietnam contained four triterpenoids (olean-12-ene-3beta,11alpha-diol, lupeol, beta-amyrin and oleanolic acid), and six xanthones (globuxanthone, subelliptenone H, subelliptenone B, 12b-hydroxy-des-D-garcigerrin A, 1-O-methylglobuxanthone and symphoxanthone). The structure of 1-O-methylglobuxanthone, the only novel compound, was determined using 1D and 2D NMR techniques and by correlation with globuxanthone.
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Affiliation(s)
- L H Nguyen
- Department of Chemistry, National University of Singapore, Singapore
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48
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Abstract
This study examines psychometric properties of the Civilian Mississippi Scale for posttraumatic stress disorder when administered in a community survey of 656 persons following the 1989 Loma Prieta earthquake. Internal consistency was lower (Cronbach's alpha = .73) than for previous analyses of civilian and combat versions of the Mississippi Scale. The analysis produced one strong factor composed of 25 items with regular wording and a second, weaker factor composed of 10 items with reversed wording. Internal consistency was higher when the 10 reversed items were removed (Cronbach's alpha = .86); the two factors were negatively correlated. Traumatic experiences and psychological distress measures explained more variance in the 25-item factor than in the 35-item scale. Further studies should focus on content analysis and performance of the reversed items.
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Affiliation(s)
- M Inkelas
- RAND Corporation, Santa Monica, California, USA
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Tambasco FP, Cohen EJ, Nguyen LH, Rapuano CJ, Laibson PR. Oral acyclovir after penetrating keratoplasty for herpes simplex keratitis. Arch Ophthalmol 1999; 117:445-9. [PMID: 10206570 DOI: 10.1001/archopht.117.4.445] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
OBJECTIVE To determine the efficacy of systemic acyclovir in decreasing complications and improving the outcome of penetrating keratoplasty for herpes simplex virus (HSV) keratitis. METHODS Retrospective study of 53 primary penetrating keratoplasties for HSV keratitis at an eye hospital from January 1, 1989, through December 31, 1996. Medical records were analyzed for history of HSV keratitis, preoperative neovascularization, and disease activity. Postoperative use of acyclovir, recurrence of HSV keratitis, rejection, uveitis or edema, and graft failure were evaluated. RESULTS Twenty-four patients (mean +/- SD follow-up, 44.7 +/- 32.6 months) received no acyclovir and were compared with 20 patients, (mean +/- SD follow-up, 28.8 +/- 16.7 months), who received 400 mg acyclovir twice a day for at least 1 year. No patient in the acyclovir group had a recurrence of dendritic keratitis in the first year compared with 5 (21%) of the patients who did not receive acyclovir (P = .03). No patient had graft failure in the acyclovir group compared with 4 (17%) in the group without acyclovir after 1 year of follow-up (P = .06). CONCLUSION Postoperative systemic acyclovir therapy after penetrating keratoplasty for HSV keratitis is associated with a reduced rate of recurrent HSV dendritic keratitis and possible graft failure at 1 year of follow-up.
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Affiliation(s)
- F P Tambasco
- Cornea Service, Wills Eye Hospital, Jefferson Medical College, Philadelphia, PA, USA
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Ermakova OV, Nguyen LH, Little RD, Chevillard C, Riblet R, Ashouian N, Birshtein BK, Schildkraut CL. Evidence that a single replication fork proceeds from early to late replicating domains in the IgH locus in a non-B cell line. Mol Cell 1999; 3:321-30. [PMID: 10198634 DOI: 10.1016/s1097-2765(00)80459-1] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In non-B cell lines, like the murine erythroleukemia cell line (MEL), the most distal IgH constant region gene, C alpha, replicates early in S; other heavy chain constant region genes, joining and diversity segments, and the most proximal Vh gene replicate successively later in S in a 3' to 5' direction proportional to their distance from C alpha. In MEL, replication forks detected in the IgH locus also proceed in the same 3' to 5' direction for approximately 400 kb, beginning downstream of the IgH 3' regulatory region and continuing to the D region, as well as within the Vh81X gene. Downstream of the initiation region is an early replicating domain, and upstream of Vh81X is a late replicating domain. Hence, the gradual transition between early and late replicated domains can be achieved by a single replication fork.
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Affiliation(s)
- O V Ermakova
- Department of Cell Biology, Albert Einstein College of Medicine, New York, New York 10461, USA
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