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Rizan C. Environmental impact of hybrid ( reusable/single-use) ports versus single-use equivalents in robotic surgery. J Robot Surg 2024; 18:155. [PMID: 38564052 DOI: 10.1007/s11701-024-01899-6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Accepted: 03/02/2024] [Indexed: 04/04/2024]
Abstract
Given the rise in robotic surgery, and parallel movement towards net zero carbon, sustainable healthcare systems, it is important that the environmental impact of robotic approaches is minimised. The majority of greenhouse gas emissions associated with robotic surgery have previously been associated with single-use items. Whilst switching from single-use products to hybrid equivalents (predominantly reusable, with a small single-use component) has previously been found to reduce the environmental impact of a range of products used for laparoscopic surgery, the generalisability of this to robotic surgery has not previously been demonstrated. In this life cycle assessment, use of hybrid 5 mm ports compatible with emerging robotic systems (143 g CO2e) was found to reduce the carbon footprint by 83% compared with using single-use equivalents (816 g CO2e), accompanied by reductions in fifteen out of eighteen midpoint environmental impact categories. For endpoint categories, there was an 81% reduction in impact on human health and species loss, and 82% reductions in resource depletion associated with using hybrid robotic 5 mm ports. Whilst the carbon footprint of 5 mm hybrid ports compatible with emerging robotic equipment was 70% higher than previous estimates of ports appropriate for conventional laparoscopic approaches, the six-fold reductions seen with hybrids in this analysis point to the generalisability of the finding that reusable or hybrid products have a lower carbon footprint when compared with single-use equivalents. Surgeons, procurement teams, and policy makers should encourage innovation towards clinically safe and effective robotic instruments with maximal reusable components.
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Affiliation(s)
- Chantelle Rizan
- Brighton and Sussex Medical School, Department of Global Health and Infection, Brighton, UK.
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2
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Liao Y, Liu Y, Liu H, Liu X, Li L, Xiao X. Controllable and reusable seesaw circuit based on nicking endonucleases. J Nanobiotechnology 2024; 22:142. [PMID: 38561751 PMCID: PMC10983715 DOI: 10.1186/s12951-024-02388-6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 03/08/2024] [Indexed: 04/04/2024] Open
Abstract
Seesaw circuits are essential for molecular computing and biosensing. However, a notable limitation of seesaw circuits lies in the irreversible depletion of components, precluding the attainment of system recovery and rendering nucleic acid circuits non-reusable. We developed a brand-new method for creating controllable and reusable seesaw circuits. By using the nicking endonucleases Nt.BbvCI and Nt.Alwi, we removed "functional components" while keeping the "skeletal components" for recurrent usage. T-inputs were introduced, increasing the signal-to-noise ratio of AND logic from 2.68 to 11.33 and demonstrating compatibility. We identified the logic switching feature and verified that it does not impair circuit performance. We also built intricate logic circuits, such as OR-AND gate, to demonstrate the versatility of our methodology. This controllable reusability extends the applications of nanotechnology and bioengineering, enhancing the practicality and efficiency of these circuits across various domains.
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Affiliation(s)
- Yuheng Liao
- Insititute of Reproductive Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - Yizhou Liu
- Insititute of Reproductive Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - Huan Liu
- Insititute of Reproductive Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - Xiao Liu
- Insititute of Reproductive Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China
| | - Longjie Li
- School of Life Science and Technology, Wuhan Polytechnic University, Wuhan, 430023, Hubei, China.
| | - Xianjin Xiao
- Insititute of Reproductive Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China.
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3
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Yang X, Guo C, Zhang Q, Chen Y, Liu Y, Zhang X. A portable thermostatic molecular diagnosis device based on high-efficiency photothermal conversion material for rapid field detection of SARS-CoV-2. Talanta 2023; 258:124422. [PMID: 36907162 PMCID: PMC9988313 DOI: 10.1016/j.talanta.2023.124422] [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: 01/11/2023] [Revised: 03/02/2023] [Accepted: 03/04/2023] [Indexed: 03/08/2023]
Abstract
The outbreak of the novel coronavirus (SARS-CoV-2) has seriously harmed human health and economic development worldwide. Studies have shown that timely diagnosis and isolation are the most effective ways to prevent the spread of the epidemic. However, the current polymerase chain reaction (PCR) based molecular diagnostic platform has the problems of expensive equipment, high operation difficulty, and the need for stable power resources support, so it is difficult to popularize in low-resource areas. This study established a portable (<300 g), low-cost (<$10), and reusable molecular diagnostic device based on solar energy photothermal conversion strategy, which creatively introduces a sunflower-like light tracking system to improve light utilization, making the device suitable for both high and low-light areas. The experimental results show that the device can detect SARS-CoV-2 nucleic acid samples as low as 1 aM within 30 min.
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Affiliation(s)
- Xinyao Yang
- Research Center for Nanosensor Molecular Diagnostic & Treatment Technology, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, Guangdong, PR China
| | - Chuanghao Guo
- Research Center for Nanosensor Molecular Diagnostic & Treatment Technology, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, Guangdong, PR China
| | - Qianling Zhang
- Graphene Composite Research Center, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, Guangdong, PR China
| | - Yong Chen
- Research Center for Nanosensor Molecular Diagnostic & Treatment Technology, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, Guangdong, PR China; Graphene Composite Research Center, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, Guangdong, PR China.
| | - Yizhen Liu
- Research Center for Nanosensor Molecular Diagnostic & Treatment Technology, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, Guangdong, PR China.
| | - Xueji Zhang
- Research Center for Nanosensor Molecular Diagnostic & Treatment Technology, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, Guangdong, PR China
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4
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You S, Chen L, Li D, Yang W, Chen L. Construction of a novel "self-regenerative" electrochemical biosensor based on metal-organic frameworks and its application to the detection of Mycoplasma ovine pneumonia. Bioelectrochemistry 2023; 152:108409. [PMID: 36898345 DOI: 10.1016/j.bioelechem.2023.108409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 02/27/2023] [Accepted: 03/01/2023] [Indexed: 03/07/2023]
Abstract
This study aimed to prepare a novel "self-regenerative" electrochemical biosensor by successively modifying gold nanoparticles, four-arm polyethylene glycol-NH2, and NH2-MIL-53 (Al) (MOF) on the glassy carbon electrode interface. A hairpin G-triplex-mediated DNA (G3 probe) as a part of the mycoplasma ovine pneumonia (MO) gene was loosely adsorbed to MOF. Based on the mechanism of hybridization induction, the G3 probe could effectively detach from the MOF only after introducing the target DNA. Subsequently, its guanine-rich nucleic acid sequences were exposed to solution of methylene blue. As a result, the diffusion current of the sensor system showed a sharp decline. The developed biosensor showed excellent selectivity, and the concentration of target DNA exhibited a good correlation in the range 10-10 to 10-6 M with a detection limit of 1.00 pM (S/N = 3), even in 10% goat serum. Most interestingly, this biosensor interface automatically started the regeneration program. Moreover, regeneration could be effectively achieved at least seven times, and the recovery rate of the electrode interface and sensing efficiency was up to 90%. Additionally, this platform could be used for other clinical assays in various systems by simply changing the DNA sequence of the probe.
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Su Y, Wenzel M, Paasch S, Seifert M, Doert T, Brunner E, Weigand JJ. One-pot synthesis of brewer's spent grain-supported superabsorbent polymer for highly efficient uranium adsorption from wastewater. Environ Res 2022; 212:113333. [PMID: 35483410 DOI: 10.1016/j.envres.2022.113333] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 01/21/2022] [Revised: 03/14/2022] [Accepted: 04/14/2022] [Indexed: 06/14/2023]
Abstract
High-efficient and fast adsorption of uranium is important to reduce the hazards caused by the uranium contamination of water environment due to the increased human activities. Herein, brewer's spent grain (BSG)-supported superabsorbent polymers (SAP) with different cross-linking densities are prepared as cheap and eco-friendly adsorbents for the first time via one-pot swelling and graft polymerization. A 7 wt% NaOH solution is used to swell BSG before grafting and subsequently neutralize the acrylic acid to control the reaction rate without producing alkaline wastewater. Compared with the traditional methods, swelling improves the grafting density and the utilization of raw materials due to the increased disorder degree of the BSG fibers. This results in the grafting of abundant carboxyl and amide groups onto the BSG backbone, forming a strongly hydrophilic polymer network of the BSG-SAP. Compared with the reference polymers without BSG, BSG-SAP presents higher adsorption capacity and enhanced reusability. The highly cross-linked BSG-SAP (BSG-SAP-H) shows an outstanding adsorption capacity of U(VI) (1465 mg/g at pH0 = 4.6), a fast adsorption rate (81% of equilibrium adsorption capacity in 15 min), and a high selectivity in the presence of competing ions. Adsorption mechanism studies reveal the involvement of amide groups, a bidentate binding structure between UO22+ and the carboxyl groups, and a cation exchange between Na+ and UO22+. More importantly, the adsorption capacity of BSG-SAP-H reaches 254.4 mg/g in the fixed-bed column experiment at a low initial concentration (c0(U) = 30 mg/L) and keeps 80% of the adsorption capacity after four cycles, indicating a great potential for uranium removal from wastewater. This work shows a suitable approach to explore the untreated biomass to prepare SAP with enhanced adsorption performance via a general and low-cost strategy.
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Affiliation(s)
- Yi Su
- Chair of Inorganic Molecular Chemistry, Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany
| | - Marco Wenzel
- Chair of Inorganic Molecular Chemistry, Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany
| | - Silvia Paasch
- Chair of Bioanalytical Chemistry, Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany
| | - Markus Seifert
- Chair of Inorganic Molecular Chemistry, Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany
| | - Thomas Doert
- Chair of Inorganic Chemistry II, Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany
| | - Eike Brunner
- Chair of Bioanalytical Chemistry, Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany
| | - Jan J Weigand
- Chair of Inorganic Molecular Chemistry, Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany.
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Liu E, Fan X, Yang Z, Han L, Li S, Huang Y, Liao K, Cai L. Rapid and simultaneous detection of multiple illegal additives in feed and food by SERS with reusable Cu 2O-Ag/AF-C 3N 4 substrate. Spectrochim Acta A Mol Biomol Spectrosc 2022; 276:121229. [PMID: 35427922 DOI: 10.1016/j.saa.2022.121229] [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: 02/06/2022] [Revised: 03/25/2022] [Accepted: 04/01/2022] [Indexed: 06/14/2023]
Abstract
Illegal additives can bring the economic benefit, resulting in the continuous irregularities in the use of illegal additives. In this study, a method for rapid, sensitive, and simultaneous detection of multiple illegal additives including enrofloxacin, malachite green, nitrofurazone, and Sudan Ⅰ in feed and food samples by surface-enhanced Raman spectroscopy (SERS) with Cu2O-Ag/AF-C3N4 composite substrate was developed. A Cu2O-Ag/AF-C3N4 composite substrate was prepared by reacting Cu2O modified by AF-C3N4 nanosheets with AgNO3 solution. The substrate has a limit of detection (LOD) of 1.29 × 10-6 mg/L, a good linear relationship of between 10-6 and 10-2 mg/L, and an R2 value of 0.95 for Rhodamine B detection. Furthermore, the substrate showed high uniformity and reproducibility, with relative standard deviations (RSD) of 6.74% and 4.85%, respectively. Adding AF-C3N4 nanosheets not only increased the enhancement effect of the substrate, which was 4.4 times of that before addition, but also endowed it with good self-cleaning characteristics owing to its excellent photocatalytic activity. The substrate can be reused, with over 80% of the original Raman signal strength remaining after four repeat uses. The SERS based on the above substrate was used to detect the illegal additives, the LOD of enrofloxacin, malachite green, nitrofurazone, and Sudan Ⅰ can reach 4.67 × 10-4 mg/L, 2.57 × 10-5 mg/L, 5.7 × 10-7 mg/L and 6.92 × 10-5 mg/L. The results reveal that this substrate has great application potential in feed and food safety.
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Affiliation(s)
- Erwei Liu
- College of Engineering, China Agricultural University, Beijing 100083, PR China
| | - Xia Fan
- China National Feed Quality Inspection and Testing Center for Agro-products of CAAS, Beijing 100081, PR China
| | - Zengling Yang
- College of Engineering, China Agricultural University, Beijing 100083, PR China.
| | - Lujia Han
- College of Engineering, China Agricultural University, Beijing 100083, PR China
| | - Shouxue Li
- College of Engineering, China Agricultural University, Beijing 100083, PR China
| | - Yuanping Huang
- College of Engineering, China Agricultural University, Beijing 100083, PR China
| | - Keke Liao
- College of Engineering, China Agricultural University, Beijing 100083, PR China
| | - Linwei Cai
- College of Engineering, China Agricultural University, Beijing 100083, PR China
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7
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Liu E, Han L, Fan X, Yang Z, Jia Z, Shi S, Huang Y, Cai L, Yuan X. New rapid detection method of total chlorogenic acids in plants using SERS based on reusable Cu 2O-Ag substrate. Talanta 2022; 247:123552. [PMID: 35594836 DOI: 10.1016/j.talanta.2022.123552] [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: 10/14/2021] [Revised: 01/18/2022] [Accepted: 05/12/2022] [Indexed: 10/18/2022]
Abstract
A new method for rapidly detecting of total chlorogenic acids (CGAs) in plants by surface-enhanced Raman spectroscopy (SERS) based on reusable Cu2O-Ag substrate was developed in this study. The Cu2O-Ag substrate prepared by the in-situ growth method had high uniformity with peak intensity relative standard deviation (RSD) of 5.27%, repeatability with peak intensity RSD of 3.58%, and sensitivity with an analytical enhancement factor of 1.27 × 105 for detecting CGAs. Furthermore, the substrate had excellent reusability, after it was reused for seven cycles, the signal strength of CGAs was still above 80% of initial. Compared with the standard method of high-performance liquid chromatography (HPLC), the SERS method can successfully analyze the contents of total CGAs in plants, such as Stevia rebaudiana leaves, coffee beans, Lonicera japonica leaves, and Eucommia ulmoides flowers, with recovery rate from 93.26% to 112.65%, and the limit of detection was 0.13 μg/mL. The total CGAs content of Stevia rebaudiana leaves samples detected by HPLC and SERS have good consistency with R = 0.9760 and RMSE = 3286 mg/kg. Furthermore, the SERS method only needed less than 1 min, one standard and reusable substrate in this study to analyze, which can further reduce the cost of method analysis. Therefore, the SERS method with the appropriate substrate can provide a rapid, accurate, and economic way to detect the total CGAs in plants.
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Affiliation(s)
- Erwei Liu
- College of Engineering, China Agricultural University, Beijing, 100083, PR China
| | - Lujia Han
- College of Engineering, China Agricultural University, Beijing, 100083, PR China
| | - Xia Fan
- Institute of Quality Standard and Testing Technology for Agro-products of CAAS, Beijing, 100081, PR China
| | - Zengling Yang
- College of Engineering, China Agricultural University, Beijing, 100083, PR China.
| | - Zheng Jia
- Institute of Quality Standard and Testing Technology for Agro-products of CAAS, Beijing, 100081, PR China
| | - Suan Shi
- College of Engineering, China Agricultural University, Beijing, 100083, PR China
| | - Yuanping Huang
- College of Engineering, China Agricultural University, Beijing, 100083, PR China
| | - Linwei Cai
- College of Engineering, China Agricultural University, Beijing, 100083, PR China
| | - Xiangru Yuan
- College of Engineering, China Agricultural University, Beijing, 100083, PR China
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Ribeiro VV, De-la-Torre GE, Castro ÍB. COVID-19-related personal protective equipment (PPE) contamination in the highly urbanized southeast Brazilian coast. Mar Pollut Bull 2022; 177:113522. [PMID: 35299146 PMCID: PMC8907012 DOI: 10.1016/j.marpolbul.2022.113522] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 12/22/2021] [Revised: 02/22/2022] [Accepted: 02/27/2022] [Indexed: 05/05/2023]
Abstract
This study aimed to report personal protective equipment (PPE) contamination in Santos beaches (Brazil) using standardized procedures for the first time while comparing two periods to understand the progression of PPE contamination. The occurrence of PPE items was ubiquitous in all sampled sites, although the densities were relatively low compared to those in other parts of the world. Unlike previous studies, reusable face masks were the most common type of PPE. PPE density in the studied areas was similar in both sampling seasons, probably because of the influence of tourism, urbanization, and local hydrodynamic aspects. PPE items can release microfibers into the aquatic environment and pose entanglement hazards to marine biota. A wider monitoring of PPE pollution, accompanied by surveys on PPE usage and behavior, as well as chemical characterization of the discarded PPE items, is needed to fully understand this unprecedented form of plastic pollution.
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Affiliation(s)
| | - Gabriel E De-la-Torre
- Grupo de Investigación de Biodiversidad, Medio Ambiente y Sociedad, Universidad San Ignacio de Loyola, Lima, Peru.
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Ribeiro VV, De-la-Torre GE, Castro ÍB. COVID-19-related personal protective equipment (PPE) contamination in the highly urbanized southeast Brazilian coast. Mar Pollut Bull 2022; 177:113522. [PMID: 35299146 DOI: 10.1016/2fj.marpolbul.2022.113522] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 02/22/2022] [Accepted: 02/27/2022] [Indexed: 05/24/2023]
Abstract
This study aimed to report personal protective equipment (PPE) contamination in Santos beaches (Brazil) using standardized procedures for the first time while comparing two periods to understand the progression of PPE contamination. The occurrence of PPE items was ubiquitous in all sampled sites, although the densities were relatively low compared to those in other parts of the world. Unlike previous studies, reusable face masks were the most common type of PPE. PPE density in the studied areas was similar in both sampling seasons, probably because of the influence of tourism, urbanization, and local hydrodynamic aspects. PPE items can release microfibers into the aquatic environment and pose entanglement hazards to marine biota. A wider monitoring of PPE pollution, accompanied by surveys on PPE usage and behavior, as well as chemical characterization of the discarded PPE items, is needed to fully understand this unprecedented form of plastic pollution.
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Affiliation(s)
| | - Gabriel E De-la-Torre
- Grupo de Investigación de Biodiversidad, Medio Ambiente y Sociedad, Universidad San Ignacio de Loyola, Lima, Peru.
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Hu S, Tian H, Zhang S, Wang D, Gong G, Yue W, Liu K, Hong S, Wang R, Yuan Q, Lu Y, Wang D, Zhang L, Chen J. Fabrication of a High-Performance and Reusable Planar Face Mask in Response to the COVID-19 Pandemic. Engineering (Beijing) 2022; 9:101-110. [PMID: 34745685 PMCID: PMC8563499 DOI: 10.1016/j.eng.2021.07.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 07/21/2021] [Accepted: 07/21/2021] [Indexed: 05/27/2023]
Abstract
The coronavirus disease 2019 (COVID-19) pandemic has caused a surge in demand for face masks, with the massive consumption of masks leading to an increase in resource-related and environmental concerns. In this work, we fabricated meltblown polypropylene (mb-PP)-based high-performance planar face masks and investigated the effects of six commonly used disinfection methods and various mask-wearing periods on the reusability of these masks. The results show that, after three cycles of treatment using hot water at 70 °C for 30 min, which is one of the most scalable, user-friendly methods for viral disinfection, the particle filtration efficiency (PFE) of the mask remained almost unchanged. After mask wearing for 24 h and subsequent disinfection using the same treatment procedures, the PFE decreased to 91.3%; the average number of bacterial and fungal colonies was assessed to be 9.2 and 51.6 colony-forming units per gram (CFU∙g- 1), respectively; and coliform and pyogenic bacteria were not detected. Both the PFE and the microbial indicators are well above the standard for reusable masks after disinfection. Schlieren photography was then used to assess the capabilities of used and disinfected masks during use; it showed that the masks exhibit a high performance in suppressing the spread of breathed air.
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Affiliation(s)
- Shui Hu
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Hongchi Tian
- Dawn Polymer (Beijing) Technology Co., Ltd., Beijing 101599, China
| | - Shijia Zhang
- Dawn Polymer (Beijing) Technology Co., Ltd., Beijing 101599, China
| | - Dan Wang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Guozhuo Gong
- Beijing Municipal Institute of Labor Protection, Beijing 100054, China
| | - Weihua Yue
- Beijing Institute of Medical Device Testing, Beijing 101111, China
| | - Keyang Liu
- Beijing Institute of Medical Device Testing, Beijing 101111, China
| | - Song Hong
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Rui Wang
- School of Materials Design and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
| | - Qingqing Yuan
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Yonglai Lu
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Dong Wang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Liqun Zhang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Jianfeng Chen
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
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11
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Carlier M, Baboudjian M, Govidin L, Yahia M, Chiappini J, Lechevallier E, Boissier R. [Single-use versus reusable flexible ureteroscope: Technical and medico-economic aspects]. Prog Urol 2021; 31:937-942. [PMID: 34456138 DOI: 10.1016/j.purol.2021.08.040] [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: 08/05/2021] [Accepted: 08/12/2021] [Indexed: 10/20/2022]
Abstract
INTRODUCTION Sate of the art on the indications, methods of implementation and medico-economic considerations of reusable flexible ureteroscopes (URSr) vs single use (URSuu)? METHOD Review of the literature (Pubmed) on reusable and single-use ureteroscopes, as well as on the expertise of our center. A PubMed search and narrative review of the data was performed in July 2021. Only articles in French or English were selected. RESULTS The URSr and URSuu have similar technical characteristics and are suitable for the exploration of the upper urinary excretory tract: treatment of stones of the kidney <2cm or of the ureter. The URSr is the most common type of ureteroscope. URSuu are newer and associated with many advantages: no sterilization procedure, immediate availability of equipment in the operating room, reduced waste production at the institutional level. A hybrid use of URSr and URSuu currently seems to be the best compromise from a medico-economic point of view for high volume centers. In the case of a smaller activity or a secondary site, URSuu are more advantageous and the reduction in purchasing costs should accentuate this benefit. CONCLUSION URSr and URSuu are technically similar and allow identical treatment of upper urinary tract pathologies. Their complementary use optimizes the care of urology patients. The barrier to the exclusive use of URSuu remains their cost.
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Affiliation(s)
- M Carlier
- Aix-Marseille université, service d'urologie et de transplantation rénale, CHU La Conception, AP-HM, Marseille, France
| | - M Baboudjian
- Aix-Marseille université, service d'urologie et de transplantation rénale, CHU La Conception, AP-HM, Marseille, France
| | - L Govidin
- Aix-Marseille université, service d'urologie et de transplantation rénale, CHU La Conception, AP-HM, Marseille, France
| | - M Yahia
- Aix-Marseille université, service d'urologie et de transplantation rénale, CHU La Conception, AP-HM, Marseille, France
| | - J Chiappini
- Aix-Marseille université, service d'urologie et de transplantation rénale, CHU La Conception, AP-HM, Marseille, France
| | - E Lechevallier
- Aix-Marseille université, service d'urologie et de transplantation rénale, CHU La Conception, AP-HM, Marseille, France
| | - R Boissier
- Aix-Marseille université, service d'urologie et de transplantation rénale, CHU La Conception, AP-HM, Marseille, France.
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Ventimiglia E, Smyth N, Doizi S, Jiménez Godínez A, Barghouthy Y, Corrales Acosta MA, Kamkoum H, Somani B, Traxer O. Can the introduction of single-use flexible ureteroscopes increase the longevity of reusable flexible ureteroscopes at a high volume centre? World J Urol 2021. [PMID: 34424373 DOI: 10.1007/s00345-021-03808-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 08/04/2021] [Indexed: 10/20/2022] Open
Abstract
OBJECTIVES To assess whether the introduction of single use flexibles ureteroscopes (su-fURS) at our high-volume centre had an advantageous impact on the turn-over and breakage rates of reusable fURS (re-fURS). METHODS We analysed re-fURS number of usages and breakages at our centre between February 2015 and December 2018. We recorded the number of usages for analysed scope between the first usage until a breakage requiring reconditioning. Usage count was restarted following each reconditioning episode. Since su-fURS (Lithovue, Boston Scientific, USA) were introduced at our center in September 2016, we had the chance to compare different re-fURS life cycles according to both su-fURS availability and usage intensity (i.e., number of su-fURS used during each re-fURS life cycle). We then explored the relationship between su-fURS usage intensity and reusable scope survival (i.e., number of utilizations before any breakage requiring reconditioning) using locally weighted scatterplot smoothing (LOWESS) approach. RESULTS Five different re-fURSs were employed at our centre, for a total of 1820 usages and 40 breakages requiring reconditioning. The overall mean (SD) number of usages before breaking was 40 (22). After su-fURS introduction, mean (SD) re-fURS number of usages increased from 35 (22) to 49 (20), (+ 40%, p = 0.02). The relationship between su-fURS usage intensity and reusable scopes survival showed a linear survival increase after 10 or more su-fURS scopes were used per life cycle. CONCLUSIONS The life cycle of re-fURS increased by 40% after the introduction of su-fURS. Ten or more used su-fURS per life cycle were associated with increased re-fURS survival.
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Nana L, Ruiyi L, Qinsheng W, Yongqiang Y, Xiulan S, Guangli W, Zaijun L. Colorimetric detection of chlorpyrifos in peach based on cobalt-graphene nanohybrid with excellent oxidase-like activity and reusability. J Hazard Mater 2021; 415:125752. [PMID: 34088207 DOI: 10.1016/j.jhazmat.2021.125752] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [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: 02/05/2021] [Revised: 03/10/2021] [Accepted: 03/20/2021] [Indexed: 06/12/2023]
Abstract
Cobalt nanocrystal has been widely used as nano-enzyme for sensing and catalysis due to its high stability and low cost, but poor catalytic activity limits its applications in bioanalysis. The study reports one strategy for synthesis of cobalt-graphene nanohybrid. Histidine-functionalized graphene quantum dot (His-GQD) was bound to graphene sheet via π-π stacking and then combined with cobalt ions in the presence of cetyltrimethylammonium chloride to form stable complex and finally reduced under nitrogen to obtain Co-His-GQD-G. The as-synthesized nanohybrid offers well-defined three-dimensional structure and quasi-superparamagnetism. The cobalt nanoparticles were well dispersed on graphene sheets. The unique structure improves oxidase-like activity of Co-His-GQD-G. Further, Co-His-GQD-G was used as the nanozyme for colorimetric detection of chlorpyrifos. Co-His-GQD-G catalyzes oxidization of 3,3',5,5'-tetramethylbenzidine into blue product. Thiocholine produced by hydrolysis of acetylthiocholine under catalysis of acetylcholinesterase inhibits catalytic activity of Co-His-GQD-G and leads to a reduced oxidization rate. Chlorpyrifos inhibits activity of acetylcholinesterase and brings an enhanced absorbance of blue product. The absorbance at 652 nm linearly increases with increasing chlorpyrifos concentration in the range of 2-20 ng mL-1 with detection limit of 0.57 ng mL-1 (S/N = 3). The method was successfully applied in determination of chlorpyrifos in peach by preparing Co-His-GQD-G magnetic gel sheet.
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Affiliation(s)
- Li Nana
- School of Chemical and Material Engineering, School of Pharmaceutical Science and School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Li Ruiyi
- School of Chemical and Material Engineering, School of Pharmaceutical Science and School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Wang Qinsheng
- National Graphene Products Quality Supervision and Inspection Center (Jiangsu), Jiangsu Province Special Equipment Safety Supervision Inspection Institute·Branch of Wuxi, Wuxi 214174, China
| | - Yang Yongqiang
- National Graphene Products Quality Supervision and Inspection Center (Jiangsu), Jiangsu Province Special Equipment Safety Supervision Inspection Institute·Branch of Wuxi, Wuxi 214174, China
| | - Sun Xiulan
- School of Chemical and Material Engineering, School of Pharmaceutical Science and School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Wang Guangli
- School of Chemical and Material Engineering, School of Pharmaceutical Science and School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Li Zaijun
- School of Chemical and Material Engineering, School of Pharmaceutical Science and School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
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Saliman NH, Maldonado-Codina C, Morgan PB. Effect of material and care system combination on subclinical inflammation of the ocular surface in soft contact lens wear. Cont Lens Anterior Eye 2021; 45:101489. [PMID: 34281726 DOI: 10.1016/j.clae.2021.101489] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 03/04/2021] [Revised: 07/03/2021] [Accepted: 07/07/2021] [Indexed: 12/20/2022]
Abstract
PURPOSE To investigate the ocular subclinical inflammatory response in two soft contact lens materials when used in combination with two different care systems ('solutions'). METHODS Fifteen established soft contact lens wearers wore each of two lenses: Acuvue® 2 (CH) and Acuvue® Oasys® (SiH) or no lenses in random sequence for one week. Two care systems were used: a peroxide system: Oxysept 1 Step® (P) for the right lens and Opti-Free® Replenish® (MPS) for the left lens. After one week of lens/no lens wear, in vivo confocal microscopy (IVCM) of corneal and conjunctival regions was carried out. Density of presumed dendritic cells (DC) and 'white spots' (WS) were quantified. Impression cytology of the bulbar and upper eyelid margin conjunctivae was carried out and samples were analysed for CD45+, CD3+ and CD11c+ cells. RESULTS The SiH + MPS combination showed a greater inflammatory response compared to SiH + P in seven out of 12 parameters investigated (p < 0.05). The remaining five were not statistically different between the two solutions. The converse was found for the CH lens, with four of the 12 parameters showing a greater response with the P solution compared to the MPS (p < 0.05). CONCLUSION This study suggests that the SiH lens investigated demonstrated an upregulated response when used with a MPS compared to a P solution whereas the converse is true for the CH lens which showed a reduced response when used with a MPS compared to a P solution. This finding aids in the understanding of the biological underpinnings of manifest corneal inflammatory events during contact lens wear.
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Affiliation(s)
- Noor Haziq Saliman
- Eurolens Research, Division of Pharmacy and Optometry, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom; Neuroscience and Ophthalmology, Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom; NIHR Surgical Reconstruction and Microbiology Research Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom.
| | - Carole Maldonado-Codina
- Eurolens Research, Division of Pharmacy and Optometry, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom
| | - Philip B Morgan
- Eurolens Research, Division of Pharmacy and Optometry, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom
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15
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Cai R, Lu D, She Q, You R, Feng S, Lin X, Lu Y. Reusable 3D silver superposed silica SERS substrate based on the Griess reaction for the ratiometric detection of nitrite. Anal Bioanal Chem 2021; 413:4751-4761. [PMID: 34132820 DOI: 10.1007/s00216-021-03429-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 04/26/2021] [Accepted: 05/21/2021] [Indexed: 10/21/2022]
Abstract
When nitrite is ingested and absorbed by the body, it can be converted into highly toxic nitrosamines (carcinogens, teratogens, and mutagens), posing health risks to the general population. Therefore, it calls for establishing a method for determination of nitrite. In this paper, the glass-SiO2-Ag surface-enhanced Raman scattering (SERS) substrate with a large number of "hot spots" were prepared by two kinds of silane coupling agents. The SERS substrate had high sensitivity and repeatability. Silicon dioxide supported the silver nanoparticles (Ag NPs), which increased surface roughness of the substrate, generated a great quantity of hot spots and enhanced the SERS signal. In the SERS spectrum, the intensity ratio of the two characteristic peaks (1287 cm-1 and 1076 cm-1) had a good linear correlation with the logarithm of the concentration of nitrite, R2 = 0.9652. The recoveries of 50 μM and 100 μM nitrite in three kinds of foods, three kinds of cosmetics and tap water were 90.9-105.3%.
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Affiliation(s)
- Rongyuan Cai
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Engineering Research Center of Industrial Biocatalysis, Fujian Province Higher Education Institutes, Fujian Normal University, Fuzhou, 350007, Fujian, China
| | - Dechan Lu
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Engineering Research Center of Industrial Biocatalysis, Fujian Province Higher Education Institutes, Fujian Normal University, Fuzhou, 350007, Fujian, China.,Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory of Photonics Technology, Fujian Normal University, Fuzhou, 350117, Fujian, China
| | - Qiutian She
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Engineering Research Center of Industrial Biocatalysis, Fujian Province Higher Education Institutes, Fujian Normal University, Fuzhou, 350007, Fujian, China
| | - Ruiyun You
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Engineering Research Center of Industrial Biocatalysis, Fujian Province Higher Education Institutes, Fujian Normal University, Fuzhou, 350007, Fujian, China
| | - Shangyuan Feng
- Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory of Photonics Technology, Fujian Normal University, Fuzhou, 350117, Fujian, China
| | - Xueliang Lin
- Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory of Photonics Technology, Fujian Normal University, Fuzhou, 350117, Fujian, China
| | - Yudong Lu
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Engineering Research Center of Industrial Biocatalysis, Fujian Province Higher Education Institutes, Fujian Normal University, Fuzhou, 350007, Fujian, China.
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16
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Pal K, Kyzas GZ, Kralj S, Gomes de Souza F. Sunlight sterilized, recyclable and super hydrophobic anti-COVID laser-induced graphene mask formulation for indelible usability. J Mol Struct 2021; 1233:130100. [PMID: 33619412 PMCID: PMC7884028 DOI: 10.1016/j.molstruc.2021.130100] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [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: 11/30/2020] [Revised: 01/24/2021] [Accepted: 02/04/2021] [Indexed: 12/16/2022]
Abstract
The uncontrollable outbreak of the novel coronavirus (COVID-19) rapidly affected almost 230 countries across the world and territories since last year'2020 and its transmission mainly due to respiratory droplets. To fight and protect against micron dimension (~1.4 µm) corona virus the usage of disposable medical masks is one and only trivial option for patients, doctors, health employers and in fact mandatory for kids to senior citizens, as well as public places in a risky environment. Ordinary medical masks unable to self-sterilize in order to recycle for other appliances resulting further destroying impact of societies high economic and environmental costs. To minimize this global pandemic issue this proposal explores novel mechanism for further commercialization of surgical mask of photo-thermal and self-cleaning functionalization. Indeed, depositing few layer ultra-thin graphene coating onto low-melting temperature non-woven mask by tempering a dual mode laser induced mechanism. Incoming aqueous droplets are bounced off due the super-hydrophobic states were treated on the mask surface. Superficial hydrophobic surface yields an advanced safety towards approaching respiratory droplets. Due to the huge absorption coefficient capability of the sunrays activated laser-induced mask may rapidly boost temperature exceeds 85ºC under sunlight illumination, causes making the mask reusable after sunlight distillation. For SARS/coronavirus/ aerosolized bacteria, laser induced graphene mask is a recent breakthrough in superior antibacterial capacity. Furthermore, cost-effective and ultra-thin layered mask formulation recycled directly utilizes solar-driven desalination with remarkable self-exclusion performance for indelible usability. Featured review article, deals with remarkable achievements from forthcoming experimentation which may be inspired with layered mask designing by more progressive materials.
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Affiliation(s)
- Kaushik Pal
- Laboratório de Biopolímeros e Sensores, Instituto de Macromoléculas, Universidade Federal do Rio de Janeiro (LABIOS/IMA/UFRJ), Centro de Tecnologia – Cidade Universitária, AV Horácio Macedo 2030, Bloco J CEP 21941-598 CP 68525, Rio de Janeiro, Brazil,Corresponding author
| | - George Z. Kyzas
- Department of Chemistry, International Hellenic University, GR-654 04 Kavala, Greece
| | - Samo Kralj
- Solid State Department,"Jozef Stefan" Institute Jamova 39, 1000 Ljubljana, University of Maribör,Koroska 160, 2000 Maribör, Slovenia
| | - F. Gomes de Souza
- Laboratório de Biopolímeros e Sensores, Instituto de Macromoléculas, Universidade Federal do Rio de Janeiro (LABIOS/IMA/UFRJ), Centro de Tecnologia – Cidade Universitária, AV Horácio Macedo 2030, Bloco J CEP 21941-598 CP 68525, Rio de Janeiro, Brazil,Programa de Engenharia da Nanotecnologia (PENt/COPPE/UFRJ), Universidade Federal, de Rio de Janeiro, Brazil
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17
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Wolffsohn JS, Ghorbani-Mojarrad N, Vianya-Estopa M, Nagra M, Huntjens B, Terry L, Sweeney LE, Dutta D, Joshi MR, Wright D, Bruce H, Hallam E, Jolly L, Chung YB, En Tsen JR, Bishop A, Davison R, Maldonado-Codina C; members of the British and Irish University and College Contact Lens Educators (BUCCLE) group. Fast versus gradual adaptation of soft monthly contact lenses in neophyte wearers. Cont Lens Anterior Eye 2021;:101469. [PMID: 34034960 DOI: 10.1016/j.clae.2021.101469] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/30/2021] [Accepted: 05/09/2021] [Indexed: 11/23/2022]
Abstract
AIM To determine if a gradual adaptation period is necessary for neophytes when fitted with modern hydrogel or silicone hydrogel reusable disposable contact lenses. METHOD Across four sites, 74 neophytes (18-28 years) were randomly assigned to a reusable lens cleaned nightly with Opti-Free® Puremoist® multi-purpose contact lens solution: Proclear® (hydrogel) or Biofinity® (silicone hydrogel) and an adaptation schedule: fast (10 h wear from the first day) or gradual (4 h on the first day, increasing their wear time by 2 h on each subsequent day until they had reached 10 h). Masked investigators graded ocular surface physiology and non-invasive tear breakup time (NIBUT) and a range of comfort, vision and lens handling subjective ratings (0-100 visual analogue scales) were recorded at the baseline visit and after 10 h of lens wear, 4-6 days and 12-14 days after lens fitting. Subjective scores were also repeated after 7 days. RESULTS There was no difference (p > 0.05) in ocular surface physiology or NIBUT between fast and gradual adaptation groups at any time point in either lens type with the exception of increased corneal staining (p = 0.019) in the silicone hydrogel fast adaptation group after 4-6 days, but was similar by 12-14 days. Subjective scores were also similar across the visits and lens types with the exception of 'lens awareness' (p = 0.019) which was less in the gradual versus the fast adaptation silicone hydrogel lens group at 12-14 days. CONCLUSION There seems to be no clinical benefit for recommending a gradual adaptation period in new wearers fitted with modern soft reusable disposable contact lenses. The findings of this work add to a growing body of evidence suggesting that such advice is unnecessary in regular soft contact lens wear, which has important ramifications for the initial clinical management of these patients.
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18
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Pandit A, Khare L, Ganatra P, Jain R, Dandekar P. Intriguing role of novel ionic liquids in stochastic degradation of chitosan. Carbohydr Polym 2021; 260:117828. [PMID: 33712168 DOI: 10.1016/j.carbpol.2021.117828] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 01/12/2021] [Revised: 02/04/2021] [Accepted: 02/11/2021] [Indexed: 10/22/2022]
Abstract
Green technique for hydrolysis of chitosan was developed using novel Brønsted Acidic Ionic Liquids (BAILs) as homogenous reusable catalysts. Efficiency of BAILs in controlling stochastic and irregular breakdown of chitosan was compared with that of mineral acids. Structural elucidation of the novel BAILs was performed using H1-NMR evaluation and supplemented using mass spectroscopy. Additionally, thermal characterization was conducted using TGA-DTA analysis, while acidity was estimated by deriving the Hammet acidity function. BAILs investigated in this work enabled consistent production of LMWCS variants, with minimum formation of residual impurities. Around 80 % reduction in molecular weight was noted as compared to original under extreme conditions employed. Further, Box-Behnken Design (BBD) was implemented to optimize effect of processing parameters for conversion of chitosan to low molecular weight congeners.
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Affiliation(s)
- A Pandit
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai -19, India
| | - L Khare
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Matunga, Mumbai-19, India
| | - P Ganatra
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai -19, India
| | - R Jain
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai -19, India
| | - P Dandekar
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Matunga, Mumbai-19, India.
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19
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Abstract
The recognition of specific DNA sequences by proteins is crucial to fundamental biological processes such as DNA replication, transcription, and gene regulation. The technique of surface plasmon resonance (SPR) is ideally suited for the measurement of these interactions because it is quantitative, simple to implement, reproducible, can be automated, and requires very little sample. This typically involves the direct capture of biotinylated DNA to a streptavidin (SA) chip before flowing over the protein of interest and monitoring the interaction. However, once the DNA has been immobilized on the chip, it cannot be removed without damaging the chip surface. Moreover, if the protein-DNA interaction is strong, then it may not be possible to remove the protein from the DNA without damaging the chip surface. Given that the chips are costly, this will limit the number of samples that can be tested. Therefore, we have developed a Reusable DNA Capture Technology, or ReDCaT chip, that enables a single streptavidin chip to be used multiple times making the technique simple, quick, and cost effective. The general steps to prepare the ReDCaT chip, run a simple binding experiment, and analysis of data will be described in detail. Some additional applications will also be introduced.
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Affiliation(s)
- Clare E M Stevenson
- Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich, UK.
| | - David M Lawson
- Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich, UK
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20
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Wang D, Sun BC, Wang JX, Zhou YY, Chen ZW, Fang Y, Yue WH, Liu SM, Liu KY, Zeng XF, Chu GW, Chen JF. Can Masks Be Reused After Hot Water Decontamination During the COVID-19 Pandemic? Engineering (Beijing) 2020; 6:1115-1121. [PMID: 32837748 PMCID: PMC7320690 DOI: 10.1016/j.eng.2020.05.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 05/29/2020] [Indexed: 05/05/2023]
Abstract
Masks have become one of the most indispensable pieces of personal protective equipment and are important strategic products during the coronavirus disease 2019 (COVID-19) pandemic. Due to the huge mask demand-supply gap all over the world, the development of user-friendly technologies and methods is urgently needed to effectively extend the service time of masks. In this article, we report a very simple approach for the decontamination of masks for multiple reuse during the COVID-19 pandemic. Used masks were soaked in hot water at a temperature greater than 56 °C for 30 min, based on a recommended method to kill COVID-19 virus by the National Health Commission of the People's Republic of China. The masks were then dried using an ordinary household hair dryer to recharge the masks with electrostatic charge to recover their filtration function (the so-called "hot water decontamination + charge regeneration" method). Three kinds of typical masks (disposable medical masks, surgical masks, and KN95-grade masks) were treated and tested. The filtration efficiencies of the regenerated masks were almost maintained and met the requirements of the respective standards. These findings should have important implications for the reuse of polypropylene masks during the COVID-19 pandemic. The performance evolution of masks during human wear was further studied, and a company (Zhejiang Runtu Co., Ltd.) applied this method to enable their workers to extend the use of masks. Mask use at the company was reduced from one mask per day per person to one mask every three days per person, and 122 500 masks were saved during the period from 20 February to 30 March 2020. Furthermore, a new method for detection of faulty masks based on the penetrant inspection of fluorescent nanoparticles was established, which may provide scientific guidance and technical methods for the future development of reusable masks, structural optimization, and the formulation of comprehensive performance evaluation standards.
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Affiliation(s)
- Dan Wang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Bao-Chang Sun
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Jie-Xin Wang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Yun-Yun Zhou
- Beijing Municipal Institute of Labour Protection, Beijing 100054, China
| | - Zhuo-Wei Chen
- Beijing Municipal Institute of Labour Protection, Beijing 100054, China
| | - Yan Fang
- Beijing Municipal Institute of Labour Protection, Beijing 100054, China
| | - Wei-Hua Yue
- Beijing Institute of Medical Device Testing, Beijing 101111, China
| | - Si-Min Liu
- Beijing Institute of Medical Device Testing, Beijing 101111, China
| | - Ke-Yang Liu
- Beijing Institute of Medical Device Testing, Beijing 101111, China
| | - Xiao-Fei Zeng
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Guang-Wen Chu
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Jian-Feng Chen
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
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21
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Li Y, Li N, Jiang W, Ma G, Zangeneh MM. In situ decorated Au NPs on pectin-modified Fe 3O 4 NPs as a novel magnetic nanocomposite (Fe 3O 4/Pectin/Au) for catalytic reduction of nitroarenes and investigation of its anti-human lung cancer activities. Int J Biol Macromol 2020; 163:2162-2171. [PMID: 32961190 DOI: 10.1016/j.ijbiomac.2020.09.102] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [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: 07/16/2020] [Revised: 09/05/2020] [Accepted: 09/15/2020] [Indexed: 12/13/2022]
Abstract
In recent days, the green synthesized nanomagnetic biocomposites have been evolved with tremendous potential as the future catalysts. This has encouraged us to design and synthesis of a novel Au NPs immobilized pectin modified magnetic nanoparticles (Fe3O4/Pectin/Au). It was meticulously characterized using advanced analytical techniques like FT-IR, FESEM, TEM, EDX, XPS, VSM, XRD and ICP-OES. We investigated the chemical applications of the material in the catalytic reduction of nitroarenes using N2H4.H2O as the reducing agent in the EtOH/H2O solvent without any promoters or ligands. Due to strong paramagnetism, the catalyst was easily recovered and reused in 11 cycles without considerable leaching or loss in reactivity. The green protocol involves several advantages like mild conditions, easy workup, high yields, and reusability of the catalyst. Furthermore, the desired nanocomposite was employed in biological studies like anti-oxidant assay by DPPH radical scavenging test. Subsequently, on exhibiting a good IC50 value in the DPPH assay, we extended the bio-application of the Fe3O4/Pectin/Au in the anticancer study of adenocarcinoma cells of human lungs using three cancer cell lines, PC-14, LC-2/ad and HLC-1 and a normal cell line HUVEC. The best result was accomplished in PC-14 cell lines with the lowest IC50 values.
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Affiliation(s)
- Yun Li
- Department of Thoracic Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, No. 324 Jingwu Road, Huaiyin District, Jinan, Shandong Province 250021, China.
| | - Na Li
- Department of Nephrology, The People's Hospital of Zhangqiu Area, Jinan, Shandong 250200, China
| | - Wei Jiang
- Department of Cardio-Thoracic Surgery, The People's Hospital of Zhangqiu Area, Jinan, Shandong 250200, China
| | - Guoyuan Ma
- Department of Thoracic Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, No. 324 Jingwu Road, Huaiyin District, Jinan, Shandong Province 250021, China
| | - Mohammad Mahdi Zangeneh
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Razi University, Kermanshah, Iran.; Biotechnology and Medicinal Plants Research Center, Ilam University of Medical Sciences, Ilam, Iran
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22
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Yoo H, Shin J, Sim J, Cho H, Hong S. Reusable surface plasmon resonance biosensor chip for the detection of H1N1 influenza virus. Biosens Bioelectron 2020; 168:112561. [PMID: 32877782 DOI: 10.1016/j.bios.2020.112561] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [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: 03/09/2020] [Revised: 06/05/2020] [Accepted: 08/24/2020] [Indexed: 01/13/2023]
Abstract
We developed a reusable magnetic surface plasmon resonance (SPR) sensor chip for detecting various target molecules repeatedly in a conventional SPR system. Here, ferromagnetic patterns on a SPR sensor chip were utilized to trap a layer of magnetic particles, and they were utilized as a solid substrate for SPR sensing in a conventional SPR system. After a sensing experiment, the used magnetic particles were removed by external magnetic fields, and a new layer of magnetic particles was immobilized to the SPR sensor chip for additional sensing measurements. Since magnetic particles were trapped on the ferromagnetic patterns, we could use our reusable SPR chip for SPR sensing measurements in a traditional SPR system without any applied magnetic fields. Significantly, ferromagnetic patterns on the sensor chip surface deflected the strong external fields, so that the large aggregation of magnetic particles on the sensor surface was reduced. We demonstrated using a single reusable SPR sensor chip to measure the nucleoprotein (NP) of H1N1 influenza virus solution ranging repeatedly for more than 7 times without significant signal degradation. Also, different target molecules could be repeatedly measured in a single SPR chip. Since our reusable SPR sensor chip can be repeatedly used in a conventional SPR system without any chemical processes for refreshment, the cost for SPR sensing should be significantly reduced. In this case, our reusable SPR sensor chip can be a major breakthrough and can be used for versatile practical applications of SPR sensors.
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Affiliation(s)
- Haneul Yoo
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea
| | - Junghyun Shin
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jieun Sim
- Department of Nanobiotechnology, KRIBB School of Biotechnology, University of Science and Technology, Daejeon, 34113, Republic of Korea; Bionano Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141, Republic of Korea; BioNano Health Guard Research Center (H-GUARD), Daejeon, 34141, Republic of Korea
| | - Hyunmin Cho
- Department of Nanobiotechnology, KRIBB School of Biotechnology, University of Science and Technology, Daejeon, 34113, Republic of Korea; BioNano Health Guard Research Center (H-GUARD), Daejeon, 34141, Republic of Korea
| | - Seunghun Hong
- Department of Physics and Astronomy, And Institute of Applied Physics, Seoul National University, Seoul, 08826, Republic of Korea.
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Abstract
The year 2020 will be punctuated by coronavirus disease 2019 (COVID-19) in the history of human civilization. Within four months, COVID-19 has become a public healthcare crisis in all nations around the world. Until a suitable vaccine is found and made widely available, the immediate solutions to protect individuals and to control the spread of the pandemic include wearing a face mask, maintaining personal hygiene, and social distancing. Certified face masks have become national essentials, and countries have imposed restrictions on exports, which has increased the worldwide shortages of masks and raw materials. This situation has also led to confusion and misinformation about face masks. This paper aims to provide quality information on face masks to alleviate the shortages. Disinfecting used masks and making homemade masks are discussed as emergency solutions. The development and manufacture of innovative masks (such as reusable masks, antivirus masks, and degradable masks) have become essential needs of society and involve both opportunities and challenges during this unprecedented time. In this prospective study, we provide the definitions, basic requirements, materials, possible preparation methods, and challenges of these innovative masks and highlight their important role in preventing epidemics similar to COVID-19.
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Affiliation(s)
- Dongxiao Ji
- Department of Mechanical Engineering, National University of Singapore, Singapore, 117574 Singapore
| | - Li Fan
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871 China
| | - Xiaoxia Li
- Department of Mechanical Engineering, National University of Singapore, Singapore, 117574 Singapore
| | - Seeram Ramakrishna
- Department of Mechanical Engineering, National University of Singapore, Singapore, 117574 Singapore
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24
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Abstract
The outbreak of Novel Coronavirus is causing an intensely feared globally. World Health Organization has even declared that it is a global health emergency. The simplest method to limit the spread of this new virus and for people to protect themselves as well as the others is to wear a mask in crowded places. The sudden increase demand on face mask has caused manufacturers the inability to not provide enough products in a short time and the situation properly will stay the same for a period of time. In this article, we aim to give an idea on how to save the number of face masks used but still provides the same protective values using a Cardiopulmonary resuscitation (CPR) mask and a common surgical facemask.
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Affiliation(s)
- Thien Luan Phan
- Graduate Institute of Biomedical Engineering, National Chung Hsing University, Taichung, Taiwan
| | - Congo Tak-Shing Ching
- Graduate Institute of Biomedical Engineering, National Chung Hsing University, Taichung, Taiwan.
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25
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Balakumar V, Ryu JW, Kim H, Manivannan R, Son YA. Ultrasonic synthesis of α-MnO 2 nanorods: An efficient catalytic conversion of refractory pollutant, methylene blue. Ultrason Sonochem 2020; 62:104870. [PMID: 31806556 DOI: 10.1016/j.ultsonch.2019.104870] [Citation(s) in RCA: 20] [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] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 11/09/2019] [Accepted: 11/10/2019] [Indexed: 06/10/2023]
Abstract
In this work, uniform α-MnO2 nanorods were synthesized via a simple hydrothermal followed by ultrasonication method using ultrasonic bath (20 kHz, 100 W) without using any surfactant and template. The crystallographic phases and surface morphology were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transition electron microscopy (TEM) analysis, respectively. Functional group identification and chemical states of α-MnO2 nanorods were confirmed by Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The as-synthesized uniform nanorods of α-MnO2 exhibit excellent catalytic conversion of toxic organic contaminant (methylene blue (MB)) in the presence of NaBH4 as reductant. The α-MnO2 exhibits excellent stability up to four repeated catalytic cycles with nearly 92% conversion. The kinetic rate constant (k), and turnover frequency (TOF) were 0.736 min-1 and 0.02 mmol mg-1 min-1, respectively. In addition, the fast electron transfer mechanism were investigated and discussed. These results open a new avenue for developing various metal oxide catalysts, which are expected to be very useful catalytic conversions.
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Affiliation(s)
- Vellaichamy Balakumar
- Department of Advanced Organic Materials Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea
| | - Ji Won Ryu
- Department of Advanced Organic Materials Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea
| | - Hyungjoo Kim
- Department of Advanced Organic Materials Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea
| | - Ramalingam Manivannan
- Department of Advanced Organic Materials Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea
| | - Young-A Son
- Department of Advanced Organic Materials Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea.
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26
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Zhao S, Shi C, Hu H, Li Z, Xiao G, Yang Q, Sun P, Cheng L, Niu W, Bi J, Yue Z. ISFET and Dex-AgNPs based portable sensor for reusable and real-time determinations of concanavalin A and glucose on smartphone. Biosens Bioelectron 2020; 151:111962. [PMID: 31999575 DOI: 10.1016/j.bios.2019.111962] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 10/16/2019] [Revised: 12/08/2019] [Accepted: 12/11/2019] [Indexed: 02/06/2023]
Abstract
In this paper, a portable real-time sensing device was built for Concanavalin A (Con A) and glucose detection using a smartphone. The ion-sensitive field-effect transistor (ISFET) functioning at a low working point was selected as a small-size, low-power transducer, and dextran-capped silver nanoparticles (Dex-AgNPs) served as sensitive nanoprobes on the ISFET gate. Using the affinity between Con A and carbohydrates, Con A can be captured, and thus directly detected by the ISFET/Dex-AgNPs unit; then glucose can be determined indirectly by removing Con A from the ISFET/Dex-AgNPs/Con A unit via competition with dextran. The mechanism of this competition does less harm to the sensor, allows the reusability of the sensing device, and overcomes the Debye screening of the FET device in saline solutions. Powered by a button cell, the handheld device attains excellent Con A (0.16 ng mL-1) and glucose (10 nM) detection limit, and can practically be used for at least 20 days.
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Affiliation(s)
- Shuang Zhao
- Department of Microelectronics, Nankai University, Tianjin, 300350, PR China
| | - Cong Shi
- Department of Microelectronics, Nankai University, Tianjin, 300350, PR China
| | - Hongyang Hu
- Department of Microelectronics, Nankai University, Tianjin, 300350, PR China; Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, Beijing, 10010, PR China
| | - Zhengping Li
- Department of Microelectronics, Nankai University, Tianjin, 300350, PR China
| | - Gang Xiao
- Department of Microelectronics, Nankai University, Tianjin, 300350, PR China
| | - Qiaochun Yang
- Department of Microelectronics, Nankai University, Tianjin, 300350, PR China
| | - Peng Sun
- Department of Microelectronics, Nankai University, Tianjin, 300350, PR China
| | - Linyang Cheng
- Department of Microelectronics, Nankai University, Tianjin, 300350, PR China
| | - Wencheng Niu
- Department of Microelectronics, Nankai University, Tianjin, 300350, PR China
| | - Jinshun Bi
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, Beijing, 10010, PR China.
| | - Zhao Yue
- Department of Microelectronics, Nankai University, Tianjin, 300350, PR China; Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Tianjin, 300350, PR China.
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27
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Mukhopadhyay K, Naskar A, Ghosh UC, Sasikumar P. One-pot synthesis of β-cyclodextrin amended mesoporous cerium(IV) incorporated ferric oxide surface towards the evaluation of fluoride removal efficiency from contaminated water for point of use. J Hazard Mater 2020; 384:121235. [PMID: 31600695 DOI: 10.1016/j.jhazmat.2019.121235] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 09/13/2019] [Accepted: 09/13/2019] [Indexed: 05/26/2023]
Abstract
Surface modified Cerium(IV)-incorporated hydrous Fe(III) oxide (CIHFO) with β-cyclodextrin (β-CD) nanocomposite (βC-CIHFO) has been developed by in-situ wet chemical deposition method and characterized by means of some analytical tools such as FTIR, XRD,OM, SEM-EDX, TEM-EDX, AFM, TG-DTA and BET surface area analyses, resembled the irregular and undulated surface morphology consisting of microcrystals (∼2-3 nm) and mesoporous (∼6.022 nm) structure confirm surface amended CIHFO with β-CD. Enhanced fluoride adsorption capacity of βC-CIHFO (107.62 mg g-1) than pure CIHFO (32.62 mg g-1) at pH 7.0 is due to the plenty of surface -OH groups of β-CD, which plays a crucial role in enhancing fluoride adsorption capacity of CIHFO. Kinetic studies obeyed pseudo-second order kinetics and multilayer adsorption process, respectively. The adsorption process is reasonably spontaneous and endothermic in nature. Minute amount of βC-CIHFO (1.8 g L-1) can effectively treat fluoride containing natural groundwater samples (9.05 mg L-1) and achieved desirable permissible level in a while. The adsorbent was magnificently regenerated up to 75.19% with a solution of pH 13.0, and can be reused up to five cycles ensures sustainable use of proposed adsorbent for fluoride removal from aqueous media.
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Affiliation(s)
- Kankan Mukhopadhyay
- Department of Geology, Presidency University, 86/1 College Street, Kolkata, 700073, India
| | - Animesh Naskar
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata, 700073, India
| | - Uday Chand Ghosh
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata, 700073, India
| | - Palani Sasikumar
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata, 700073, India.
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28
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Tamoradi T, Veisi H, Karmakar B, Gholami J. A competent green methodology for the synthesis of aryl thioethers and 1H-tetrazole over magnetically retrievable novel CoFe 2O 4@l-asparagine anchored Cu, Ni nanocatalyst. Mater Sci Eng C Mater Biol Appl 2019; 107:110260. [PMID: 31761157 DOI: 10.1016/j.msec.2019.110260] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 09/24/2019] [Accepted: 09/25/2019] [Indexed: 12/17/2022]
Abstract
The current work describes the successful synthesis of a magnetic CoFe2O4 centered asparagine functionalized noble metal (M = Cu, Ni) anchored nanocomposite. The novel materials, synthesized by post-functionalization approach, have been characterized by XRD, SEM, EDX, X-ray elemental mapping, FT-IR and VSM studies. The materials are proved to be efficient heterogeneous catalyst in the synthesis of diarylthioethers by C-S cross coupling reaction and 5-substituted 1H-tetrazoles by azide-alkyne cycloaddition reaction under green conditions. The current methodology is advantageous in terms of simplicity of procedure, facile synthesis, high yield in short reaction time, easy magnetic isolation and reusability of catalysts in consecutive runs with insignificant change in catalytic activity.
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Affiliation(s)
- Taiebeh Tamoradi
- Department of Chemistry, Payame Noor University, 19395-4697, Tehran, Iran.
| | - Hojat Veisi
- Department of Chemistry, Payame Noor University, 19395-4697, Tehran, Iran
| | - Bikash Karmakar
- Department of Chemistry, Gobardanga Hindu College, 24-Parganas (North), India.
| | - Javad Gholami
- Department of Applied Chemistry, Faculty of Science, Malayer University, Malayer, Iran
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29
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Qu LL, Geng ZQ, Wang W, Yang KC, Wang WP, Han CQ, Yang GH, Vajtai R, Li DW, Ajayan PM. Recyclable three-dimensional Ag nanorod arrays decorated with O-g-C 3N 4 for highly sensitive SERS sensing of organic pollutants. J Hazard Mater 2019; 379:120823. [PMID: 31276918 DOI: 10.1016/j.jhazmat.2019.120823] [Citation(s) in RCA: 25] [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] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 06/01/2019] [Accepted: 06/25/2019] [Indexed: 06/09/2023]
Abstract
A three-dimensional (3D) substrate was developed by assembling a monolayer of graphitic carbon nitride (O-g-C3N4) on Ag nanorod arrays (Ag NRs) for sensitive and recyclable surface enhanced Raman scattering (SERS) detection. The prepared Ag NRs/O-g-C3N4 substrate not only generated a significant Raman enhancement effect as a result of the strong π-π stacking interaction between O-g-C3N4 and the analytes but also possessed excellent self-cleaning property via visible-light irradiation that was attributed to its outstanding catalytic performance. Highly sensitive SERS detection could be achieved with a LOD of 8.2 × 10-10 M for R6 G, and the substrate could be used repeatedly for at least four cycles with tolerable intensity attenuation. In addition, the 3D substrate exhibited long-term stability originating from the electron-donor effect of O-g-C3N4 and high reproducibility due to the uniform decoration of O-g-C3N4 on the Ag NRs through the strong interaction. Furthermore, using Ag NRs/O-g-C3N4, the recyclable detection of antibiotics in a water sample was demonstrated with high sensitivity, which indicates that the 3D Ag NRs/O-g-C3N4 substrate is a promising candidate for eliminating the challenges of single-use SERS substrates and building a portable SERS platform to sense organic molecular species.
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Affiliation(s)
- Lu-Lu Qu
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, China.
| | - Zhi-Qin Geng
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, China
| | - Wen Wang
- Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, 221116, China
| | - Kai-Chun Yang
- Department of Materials Science and Nanoengineering, Rice University, TX, 77005, USA
| | - Wei-Peng Wang
- Department of Materials Science and Nanoengineering, Rice University, TX, 77005, USA
| | - Cai-Qin Han
- Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, 221116, China.
| | - Guo-Hai Yang
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, China
| | - Robert Vajtai
- Department of Materials Science and Nanoengineering, Rice University, TX, 77005, USA
| | - Da-Wei Li
- Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry & School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China.
| | - Pulickel M Ajayan
- Department of Materials Science and Nanoengineering, Rice University, TX, 77005, USA
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30
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Mukhopadhyay K, Ghosh UC, Sasikumar P. Enhanced capacity of fluoride scavenging from contaminated water by nano-architectural reorientation of cerium-incorporated hydrous iron oxide with graphene oxide. Environ Sci Pollut Res Int 2019; 26:26112-26133. [PMID: 31280438 DOI: 10.1007/s11356-019-05756-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 02/05/2019] [Accepted: 06/13/2019] [Indexed: 06/09/2023]
Abstract
An in situ wet chemical deposition method has been applied for the successful surface modification of Ce (IV)-incorporated hydrous Fe(III) oxide (CIHFO) with a hydrophilic graphene precursor, graphene oxide (GO). The surface area of as-prepared composite (GO-CIHFO) has enhanced (189.57 m2 g-1) compared with that of pristine CIHFO (140.711 m2 g-1) and has irregular surface morphology consisting of microcrystals (~ 2-3 nm) and mesoporous (3.5486 nm) structure. The GO-CIHFO composite shows enhanced fluoride scavenging capacity (136.24 mg F g-1) than GO (3 mg F g-1) and pristine CIHFO (32.62 mg F g-1) at pH 7.0. Also, in acidic pH range and at 323 K temperature, the Langmuir capacity of as-prepared composite is 190.61 mg F g-1. It has been observed that fluoride removal by GO-CIHFO occurs from solutions obeying pseudo-second-order kinetics and multilayer adsorption process. The film/boundary layer diffusion process is also the rate-determining step. The nature of the adsorption reaction is reasonably spontaneous and endothermic in thermodynamic sense. It was observed that 1.2 g.L-1 of GO-CIHFO dosage can effectively optimise the fluoride level of natural groundwater samples (9.05 mg L-1) to the desirable permissible limit. Reactivation of used material up to a level of 73.77% with a solution of alkaline pH has proposed reusability of nanocomposites ensuring sustainability of the proposed material as fluoride scavenger in future.
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Affiliation(s)
- Kankan Mukhopadhyay
- Department of Geology, Presidency University, 86/1 College Street, Kolkata, 700073, India
| | - Uday Chand Ghosh
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata, 700073, India
| | - Palani Sasikumar
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata, 700073, India.
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31
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Hänsel M, Bambach T, Wachtel H. Reduced Environmental Impact of the Reusable Respimat ® Soft Mist™ Inhaler Compared with Pressurised Metered-Dose Inhalers. Adv Ther 2019; 36:2487-2492. [PMID: 31317391 PMCID: PMC6822840 DOI: 10.1007/s12325-019-01028-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Indexed: 11/27/2022]
Abstract
INTRODUCTION Pressurised metered-dose inhalers (pMDIs) are associated with global warming potential values as they contain a hydrofluoroalkane (HFA) propellant, whereas the Respimat® Soft Mist™ inhaler is propellant-free. The original disposable Respimat has recently been updated to provide a reusable device that is similar in performance and use but is more convenient to patients and reduces environmental impact. This study compared the product carbon footprint (PCF) of Respimat (both disposable and reusable) and pMDIs to understand life cycle hotspots, and also to determine the potential quantitative environmental benefits of a reusable Respimat product. METHODS PCFs of four inhalation products-tiotropium bromide (Spiriva®) Respimat, ipratropium bromide/fenoterol hydrobromide (Berodual®) Respimat, Berodual HFA pMDI and ipratropium bromide (Atrovent®) HFA pMDI-were assessed across their whole life cycle. RESULTS Data show that Respimat inhalers have a lower PCF (carbon dioxide equivalent per kilogram) than HFA pMDIs: pMDI Atrovent 14.59; pMDI Berodual 16.48; disposable Spiriva Respimat 0.78; disposable Berodual Respimat 0.78. Approximately 98% of the pMDI life cycle total is due to HFA propellant emissions during use and end-of-life phases. The impact of the material used for the Respimat product outweighs the impact of the material used to make the empty cartridge. Furthermore, compared with the single-use device over 1 month, the PCF of Spiriva Respimat was further reduced by 57% and 71% using the device with refill cartridges over 3 and 6 months, respectively. CONCLUSION Together, these data suggest that Respimat inhalers, and in particular the new reusable inhaler, can reduce the environmental impact associated with inhaler use. FUNDING Boehringer Ingelheim.
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Affiliation(s)
| | - Thomas Bambach
- Boehringer Ingelheim International GmbH, Ingelheim am Rhein, Germany.
| | - Herbert Wachtel
- Boehringer Ingelheim Pharma GmbH & Co. KG, Ingelheim am Rhein, Germany
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32
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Mazumder JA, Perwez M, Noori R, Sardar M. Development of sustainable and reusable silver nanoparticle-coated glass for the treatment of contaminated water. Environ Sci Pollut Res Int 2019; 26:23070-23081. [PMID: 31187375 DOI: 10.1007/s11356-019-05647-4] [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: 02/06/2019] [Accepted: 05/30/2019] [Indexed: 06/09/2023]
Abstract
Water contaminants like pathogenic microbes and organic pollutants pose a serious threat to human and aquatic life forms; thus, there is an urgent need to develop a sustainable and affordable water treatment technology. Nanomaterials especially metal nanoparticles have extensive applications in wastewater treatment, but the recovery and aggregation of nanoparticles in solution is a major limitation. In the present work, green synthesized silver nanoparticles were covalently immobilized on a glass surface to prevent aggregation of nanoparticles and to enhance their applicability. Fourier transform infrared (FTIR) of silver nanoparticle (AgNP)-coated glass shows peaks of Si-O-Si, Si-O-C, and Ag-O at 1075 cm-1, 780 cm-1, and 608 cm-1 respectively which confirms the immobilization/conjugation of nanomaterial on glass surface. The surface morphology of immobilized AgNP was studied using scanning electron microscopy (SEM) which reveals nanoparticles are spherical and uniformly distributed on glass surface. The AgNP-coated glass was used for the removal of textile dyes in solution; the result indicates approximately 95% of textile dyes were removed after 5 h of treatment. Removal of microbial contaminants from Yamuna River was studied by optical density analysis and confirmed by fluorescence dye staining. The AgNP-coated glass was also studied for their reusability and the data indicates 50% removal of microbes up to the 5th cycle. To further enhance the applicability, the inhibition of bacterial biofilms were analyzed by dark-field illumination with a fluorescence microscope. Thus AgNP-coated glass can be used in the development of food/water storage containers and in textile industries.
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Affiliation(s)
| | - Mohammad Perwez
- Department of Biosciences, Jamia Millia Islamia, New Delhi, 110025, India
| | - Rubia Noori
- Department of Biosciences, Jamia Millia Islamia, New Delhi, 110025, India
| | - Meryam Sardar
- Department of Biosciences, Jamia Millia Islamia, New Delhi, 110025, India.
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33
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Abstract
A PubMed search using the terms "single use" and "ureteroscope" was performed to identify published studies on this topic. In addition, the abstracts of the annual meeting of the World Congress of Endourology and the American Urologic Association since 2010 were reviewed. Here we present a review of published studies on single-use ureteroscopes.
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Affiliation(s)
- Brooke Moore
- Department of Urology, Massachusetts General Hospital, 55 Fruit Street, GRB 1102, Boston, MA 02114, USA
| | - Silvia Proietti
- Department of Urology, IRCCS San Raffaele Hospital, Ville Turro Division, Milan, Italy
| | - Guido Giusti
- Department of Urology, IRCCS San Raffaele Hospital, Ville Turro Division, Milan, Italy
| | - Brian H Eisner
- Department of Urology, Massachusetts General Hospital, 55 Fruit Street, GRB 1102, Boston, MA 02114, USA.
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34
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McPherson B, Sharip M, Grimmond T. The impact on life cycle carbon footprint of converting from disposable to reusable sharps containers in a large US hospital geographically distant from manufacturing and processing facilities. PeerJ 2019; 7:e6204. [PMID: 30809428 PMCID: PMC6388662 DOI: 10.7717/peerj.6204] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [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: 02/12/2018] [Accepted: 12/03/2018] [Indexed: 12/01/2022] Open
Abstract
Background Sustainable purchasing can reduce greenhouse gas (GHG) emissions at healthcare facilities (HCF). A previous study found that converting from disposable to reusable sharps containers (DSC, RSC) reduced sharps waste stream GHG by 84% but found transport distances impacted significantly on GHG outcomes and recommended further studies where transport distances are large. This case-study examines the impact on GHG of nation-wide transport distances when a large US health system converted from DSC to RSC. Methods The study’s scope was to examine life cycle GHG emissions during 12 months of facility-wide use of DSC and RSC at Loma Linda University Health (LLUH). The facility is an 1100-bed US, 5-hospital system where: the source of polymer was distant from the RSC manufacturing plant; both manufacturing plants were over 3,000 km from the HCF; and the RSC processing plant was considerably further from the HCF than was the DSC disposal plant. Using a “cradle to grave” life cycle GHG tool we calculated the annual GHG emissions of CO2, CH4 and N2O expressed in metric tonnes of carbon dioxide equivalents (MTCO2eq) for each container system. Primary energy input data was used wherever possible and region-specific energy-impact conversions were used to calculate GHG of each unit process over a 12-month period. The scope included Manufacture, Transport, Washing, and Treatment & disposal. GHG emissions from all unit process within these four life cycle stages were summed to estimate each container-system’s carbon footprint. Emission totals were workload-normalized and analysed using CHI2test with P ≤ 0.05 and rate ratios at 95% CL. Results Converting to RSC, LLUH reduced its annual GHG by 162.4 MTCO2eq (−65.3%; p < 0.001; RR 2.27–3.71), and annually eliminated 50.2 tonnes of plastic DSC and 8.1 tonnes of cardboard from the sharps waste stream. Of the plastic eliminated, 31.8 tonnes were diverted from landfill and 18.4 from incineration. Discussion Unlike GHG reduction strategies dependent on changes in staff behavior (waste segregation, recycling, turning off lights, car-pooling, etc), purchasing strategies can enable immediate, sustainable and institution-wide GHG reductions to be achieved. This study confirmed that large transport distances between polymer manufacturer, container manufacturer, user and processing facilities, can significantly impact the carbon footprint of sharps containment systems. However, even with large transport distances, we found that a large university health system significantly reduced the carbon footprint of their sharps waste stream by converting from DSC to RSC.
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Affiliation(s)
- Brett McPherson
- Environmental Health, Loma Linda University Health, San Bernardino, CA, United States of America
| | - Mihray Sharip
- Environmental Health, Loma Linda University Health, San Bernardino, CA, United States of America
| | - Terry Grimmond
- Grimmond and Associates, Microbiology Consultancy, Hamilton, New Zealand
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35
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Tsukada YT, Tokita M, Murata H, Hirasawa Y, Yodogawa K, Iwasaki YK, Asai K, Shimizu W, Kasai N, Nakashima H, Tsukada S. Validation of wearable textile electrodes for ECG monitoring. Heart Vessels 2019; 34:1203-1211. [PMID: 30680493 PMCID: PMC6556171 DOI: 10.1007/s00380-019-01347-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 01/11/2019] [Indexed: 11/25/2022]
Abstract
A highly conductive textile was woven from nano-fibers coated with the PEDOT-PSS polymer. The aim of this study was to assess the usefulness of textile electrodes for ECG recording as a smart garment. Electrode textile pads and lead wires were sewn to the lining of sportswear and their tolerability to repeated washings were tested up to 150 times. The electrical conductivity of the textile electrode remained functional for up to 50 machine washes. To assess the level of motion artifacts or noise during the daily monitoring of ECG, a single lead ECG with conventional or textile electrodes was recorded during supine rest, seated rest, upright trunk rotation (i.e., twisting), and stepping movement in 66 healthy adults. A Holter system was used for data storage and analysis. ECG patterns of P, QRS, and T waves were comparable between the conventional and textile electrodes. However, the signal-to-artifact-and/or-noise ratio (SAR) during twisting was larger in the textile electrodes than in the conventional electrodes. No skin irritation was seen in the textile electrodes. The single lead textile electrodes embedded in an inner garment were usable for continuous and/or repeated ECG monitoring in daily life except during vigorous trunk movement.
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Affiliation(s)
- Yayoi Tetsuou Tsukada
- Department of Cardiovascular Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-Ku, Tokyo, 113-8603, Japan.
| | - Miwa Tokita
- Department of Cardiovascular Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-Ku, Tokyo, 113-8603, Japan
| | - Hiroshige Murata
- Department of Cardiovascular Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-Ku, Tokyo, 113-8603, Japan
| | - Yasuhiro Hirasawa
- Department of Cardiovascular Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-Ku, Tokyo, 113-8603, Japan
- Hakujikai Memorial Hospital, 5-11-1 Shikahama, Adachi-Ku, Tokyo, 123-0864, Japan
| | - Kenji Yodogawa
- Department of Cardiovascular Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-Ku, Tokyo, 113-8603, Japan
| | - Yu-Ki Iwasaki
- Department of Cardiovascular Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-Ku, Tokyo, 113-8603, Japan
| | - Kuniya Asai
- Department of Cardiovascular Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-Ku, Tokyo, 113-8603, Japan
| | - Wataru Shimizu
- Department of Cardiovascular Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-Ku, Tokyo, 113-8603, Japan
| | - Nahoko Kasai
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya Atsugi, Kanagawa, 243-0198, Japan
| | - Hiroshi Nakashima
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya Atsugi, Kanagawa, 243-0198, Japan
| | - Shingo Tsukada
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya Atsugi, Kanagawa, 243-0198, Japan
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Shamsayei M, Yamini Y, Asiabi H. Fabrication of zwitterionic histidine/layered double hydroxide hybrid nanosheets for highly efficient and fast removal of anionic dyes. J Colloid Interface Sci 2018; 529:255-264. [PMID: 29908401 DOI: 10.1016/j.jcis.2018.06.022] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [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: 04/11/2018] [Revised: 06/04/2018] [Accepted: 06/08/2018] [Indexed: 11/16/2022]
Abstract
In this work, the bio-nanohybrids of magnesium-aluminum layered double hydroxide intercalated with zwitterionic histidine (His-LDH) was synthesized. The crystal phase, morphology, and nanostructure of the as-prepared His-LDH were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and nitrogen adsorption-desorption methods. The His-LDHs were used to remove anionic dyes, including Congo red (CR), indigo carmine (IC) and sunset yellow FCF (SY) from aqueous solutions. The detailed investigation of the kinetics and the adsorption isotherms of CR, IC and SY from aqueous solutions showed that the dyes adsorb rapidly, in accordance with a pseudo-second-order kinetics and a Freundlich adsorption isotherm model. The remarkably high adsorption capacity of the dyes on the His-LDH (efficiency of CR removal, 99.98%; maximum specific removal qmax, 1112 mg g-1; efficiency of IC removal, 98.98%; qmax, 625 mg g-1; and efficiency of SY removal, 99.78%; qmax, 400 mg g-1) is rationalized on the basis of electrostatic interactions as well as π-π and H-bonding interactions between the His-LDH adsorbent and the acidic dyes. Adsorption experiments indicate that the resulting His-LDH has great potential applications as an environmentally friendly material for the swift removal of acidic dyes from aqueous solutions.
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Affiliation(s)
- Maryam Shamsayei
- Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
| | - Yadollah Yamini
- Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
| | - Hamid Asiabi
- Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
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Kieser DC, Wyatt MC, Beswick A, Kunutsor S, Hooper GJ. Does the type of surgical drape (disposable versus non-disposable) affect the risk of subsequent surgical site infection? J Orthop 2018; 15:566-570. [PMID: 29881195 DOI: 10.1016/j.jor.2018.05.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Accepted: 05/06/2018] [Indexed: 10/17/2022] Open
Abstract
Aims Determine whether disposable or reusable drapes are better at reducing surgical site infection (SSI) rates. Methods A systematic review of the English literature from inception to 2018 with search terms relating to infection and drapes in orthopaedic and spine surgery. Results No orthopaedic or spinal surgery studies assessed the risk of SSI between reusable or disposable drapes. However, two articles, with conflicting results, compared current reusable and disposable drapes in other surgical disciplines. Conclusion There is no evidence to support a difference between reusable or disposable drapes to reduce the risk of SSI in orthopaedic and spinal surgery.
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Affiliation(s)
- David C Kieser
- Department of Orthopaedic Surgery and Musculoskeletal Medicine, University of Otago, Christchurch School of Medicine, New Zealand
| | - Michael C Wyatt
- Musculoskeletal Research Unit, Translational Health Sciences, Bristol Medical School, University of Bristol, Learning and Research Building, Level 1, Southmead Hospital, Bristol, BS10 5NB, United Kingdom
| | - Andrew Beswick
- Musculoskeletal Research Unit, Translational Health Sciences, Bristol Medical School, University of Bristol, Learning and Research Building, Level 1, Southmead Hospital, Bristol, BS10 5NB, United Kingdom
| | - Setor Kunutsor
- Musculoskeletal Research Unit, Translational Health Sciences, Bristol Medical School, University of Bristol, Learning and Research Building, Level 1, Southmead Hospital, Bristol, BS10 5NB, United Kingdom
| | - Gary J Hooper
- Department of Orthopaedic Surgery and Musculoskeletal Medicine, University of Otago, Christchurch School of Medicine, New Zealand
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Pang LJ, Hu JT, Zhang MJ, Yang CG, Wu GZ. An efficient and reusable quaternary ammonium fabric adsorbent prepared by radiation grafting for removal of Cr(VI) from wastewater. Environ Sci Pollut Res Int 2018; 25:11045-11053. [PMID: 29411276 DOI: 10.1007/s11356-018-1355-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 11/30/2017] [Accepted: 01/22/2018] [Indexed: 06/08/2023]
Abstract
A novel quaternary ammonium polyethylene nonwoven fabric for removing chromium ions from water was prepared via radiation-induced grafting of glycidyl methacrylate and further modification with N,N'-dimethylethylenediamine. The structural and morphological characteristics of the adsorbent were analyzed using Fourier transform infrared spectroscopy (FTIR), thermogravimetry and differential thermogravimetry (TG/DTG), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The influences of several principal factors, including pH value, initial Cr(VI) concentration, contact time, and coexisting anions (including SO42-, CO32-, NO3-, PO43-, and Cl-), on adsorption performance were investigated via batch tests. The results showed that the optimum removal efficiency was 99.2% at pH 3 and the maximum adsorption quantity for Cr(VI) at 25 °C was 336 mg/g. The adsorption kinetic parameters were better fitted with the pseudo-second-order kinetic model, and the equilibrium data were described very well by the Freundlich isotherm model. Furthermore, the as-synthesized adsorbent exhibited excellent regeneration and recyclability while maintaining high adsorption performance after five adsorption/desorption cycles.
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Affiliation(s)
- Li-Juan Pang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jiang-Tao Hu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
| | - Mao-Jiang Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
| | - Chen-Guang Yang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
| | - Guo-Zhong Wu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China.
- School of Physical Science and Technology, Shanghai Tech University, Shanghai, 200031, China.
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Babu SG, Aparna P, Satishkumar G, Ashokkumar M, Neppolian B. Ultrasound-assisted mineralization of organic contaminants using a recyclable LaFeO 3 and Fe 3+/persulfate Fenton-like system. Ultrason Sonochem 2017; 34:924-930. [PMID: 27773322 DOI: 10.1016/j.ultsonch.2016.08.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 07/30/2016] [Accepted: 08/01/2016] [Indexed: 06/06/2023]
Abstract
A recyclable heterogeneous catalyst has been successfully developed for application in a Fenton-type advanced oxidation process without adding external H2O2. LaFeO3 was prepared from Fe(NO3)3·9H2O and La(NO3)·6H2O by a simple sol-gel method and its catalytic efficiency was evaluated for mineralization of 4-chlorophenol using a Fenton-like process. The mineralization process was carried out under ultrasonication in presence of heterogeneous LaFeO3 catalyst with H2O2 that was produced during ultrasonication. The mineralization process was monitored through total organic carbon (TOC) analysis. Very importantly, utmost 5-fold synergism was evidenced by the ultrasound mediated LaFeO3-catalyzed system. Besides, more than twofold synergism was observed by combining the ultrasound assisted LaFeO3 catalytic process and potassium persulfate (KPS) assisted advanced oxidation process. It is worth to mention that complete mineralization (∼96%) of 4-chlorophenol (initial concentration of 1.25×10-4M) was observed within 1h in the presence of LaFeO3 (0.5gL-1) and KPS (1.0mmol) under ultrasonication (40kHz). Even after four cycles, the activity of LaFeO3 remained intact which proved its recyclability. Extremely reusable heterogeneous LaFeO3 catalyst makes the system more interesting from both economic and environmental points of view.
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Affiliation(s)
- S Ganesh Babu
- SRM Research Institute, SRM University, Kattankulathur 603203, Chennai, Tamilnadu, India
| | - P Aparna
- Department of Chemistry, Madras Christian College, Tambaram 600059, Chennai, Tamilnadu, India
| | - G Satishkumar
- Department of Chemistry, School of Advanced Sciences, VIT University, Vellore 632014, Tamilnadu, India
| | | | - B Neppolian
- SRM Research Institute, SRM University, Kattankulathur 603203, Chennai, Tamilnadu, India.
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Ishii N, Kiuchi T, Oji T, Kishi K. Microsurgical Training using Reusable Human Vessels from Discarded Tissues in Lymph Node Dissection. Arch Plast Surg 2016; 43:595-8. [PMID: 27896195 DOI: 10.5999/aps.2016.43.6.595] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 09/09/2016] [Accepted: 09/20/2016] [Indexed: 11/08/2022] Open
Abstract
The use of human vessels at the beginning of microsurgery training is highly recommended. But vessels with the appropriate length for training are not often obtained. Whether these vessels may be reused for training has not been reported. Accordingly, we harvested vessels from discarded tissues in lymph node dissection and demonstrated that vascular anastomosis training using the same human vessels several times is possible by placing the vessels in a freezer and defrosting them with hot water. Vascular walls can be stored for microsurgical training until about 4 years after harvest, as shown in the gross appearance and histologic findings of our preserved vessels. We recommend the technique presented here for the longterm reuse of human vessels for microsurgery training that closely resembles real procedures.
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Abstract
A new prototype device for beta-ray measurement, a plastic scintillation counter, was assembled as an alternative device to liquid scintillation counters. This device uses plastic scintillation sheets (PS sheets) as a sample applicator without the use of a liquid scintillator. The performance was evaluated using tritium labeled compounds, and good linearity was observed between the activity and net count rate. The calculated detection limit of the device was 0.01 Bq mL(-1) after 10 h measurement for 2 mL sample.
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Affiliation(s)
- Etsuko Furuta
- Ochanomizu University, 2-1-1 Ohtsuka, Bunkyo-ku, Tokyo 112-8610, Japan.
| | - Takao Kawano
- The National Institute for Fusion Science, 322-6 Shimo-ishichou, Toki-city, Gifu 509-5202, Japan
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Abstract
With US scalpels a new era of laparoscopic surgery has begun. We have given instances of the striking advantages of modern ultrasonic dissectors in general, and of the SonoSurg system in particular. Key aspects are reusability, modularity and multi-functionality. Modularity allows for extension of the basic scalpel e.g. to an aspirator, reusability results in cost effectiveness. Nevertheless, ultrasonically activated devices are not limited to the well-known scalpels and aspirators. New technologies such as the SonoSurg ultrasound trocar and combination instruments are currently under development.
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Affiliation(s)
- H Baltes
- a Olympus Winter&lbe Ltd , Hamburg , Germany
| | - Y Yavuz
- b National Center for Advanced Laparoscopic Surgery , Trondheim Regional and University Hospital , Trondheim , Norway
| | - T Kubota
- a Olympus Winter&lbe Ltd , Hamburg , Germany
| | - R Mårvik
- b National Center for Advanced Laparoscopic Surgery , Trondheim Regional and University Hospital , Trondheim , Norway
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