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Koley P, Jakku R, Hosseinnejad T, Periasamy S, Bhargava SK. Immobilizing nanozymes on 3D-printed metal substrates for enhanced peroxidase-like activity and trace-level glucose detection. Nanoscale 2024; 16:5561-5573. [PMID: 38258585 DOI: 10.1039/d3nr05427f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
The prevalence of 3D-printed portable biomedical sensing devices, which are fashioned mainly from plastic and polymer materials, introduces a pressing concern due to their limited reusability and consequential generation of substantial disposable waste. Considering this, herein, we pioneered a ground-breaking advancement, i.e., a 3D-printed metal substrate-based enzyme. Our inventive methodology involved the synthesis of a thermally degraded Fe-based metal-organic framework, DEG 500, followed by its deposition on a 3D-printed metal substrate composed of Ti-Al-V alloy. This novel composite exhibited remarkable peroxidase-like activity in a range of different temperatures and pH, coupled with the ability to detect glucose in real-world samples such as blood and fruit juices. The exceptional enzymatic behaviour was attributed to the diverse iron (Fe) oxidation states and the presence of oxygen vacancies, as evidenced through advanced characterization techniques. Fundamentally, we rigorously explored the mechanistic pathway through controlled studies and theoretical calculations, culminating in a transformative stride toward more sustainable and effective biomedical sensing practices.
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Affiliation(s)
- Paramita Koley
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Applied Sciences, RMIT University, GPO Box 2476, Melbourne 3001, Australia.
| | - Ranjithkumar Jakku
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Applied Sciences, RMIT University, GPO Box 2476, Melbourne 3001, Australia.
| | - Tayebeh Hosseinnejad
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Applied Sciences, RMIT University, GPO Box 2476, Melbourne 3001, Australia.
| | - Selvakannan Periasamy
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Applied Sciences, RMIT University, GPO Box 2476, Melbourne 3001, Australia.
| | - Suresh K Bhargava
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Applied Sciences, RMIT University, GPO Box 2476, Melbourne 3001, Australia.
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Polash SA, Garlick-Trease K, Pyreddy S, Periasamy S, Bryant G, Shukla R. Amino Acid-Coated Zeolitic Imidazolate Framework for Delivery of Genetic Material in Prostate Cancer Cell. Molecules 2023; 28:4875. [PMID: 37375429 DOI: 10.3390/molecules28124875] [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: 05/20/2023] [Revised: 06/15/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
Metal-organic frameworks (MOFs) are currently under progressive development as a tool for non-viral biomolecule delivery. Biomolecules such as proteins, lipids, carbohydrates, and nucleic acids can be encapsulated in MOFs for therapeutic purposes. The favorable physicochemical properties of MOFs make them an attractive choice for delivering a wide range of biomolecules including nucleic acids. Herein, a green fluorescence protein (GFP)-expressing plasmid DNA (pDNA) is used as a representative of a biomolecule to encapsulate within a Zn-based metal-organic framework (MOF) called a zeolitic imidazolate framework (ZIF). The synthesized biocomposites are coated with positively charged amino acids (AA) to understand the effect of surface functionalization on the delivery of pDNA to prostate cancer (PC-3) cells. FTIR and zeta potential confirm the successful preparation of positively charged amino acid-functionalized derivatives of pDNA@ZIF (i.e., pDNA@ZIFAA). Moreover, XRD and SEM data show that the functionalized derivates retain the pristine crystallinity and morphology of pDNA@ZIF. The coated biocomposites provide enhanced uptake of genetic material by PC-3 human prostate cancer cells. The AA-modulated fine-tuning of the surface charge of biocomposites results in better interaction with the cell membrane and enhances cellular uptake. These results suggest that pDNA@ZIFAA can be a promising alternative tool for non-viral gene delivery.
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Affiliation(s)
- Shakil Ahmed Polash
- School of Science, RMIT University, Melbourne, VIC 3000, Australia
- Ian Potter NanoBiosensing Facility, NanoBiotechnology Research Laboratory (NBRL), RMIT University, Melbourne, VIC 3000, Australia
| | | | - Suneela Pyreddy
- School of Science, RMIT University, Melbourne, VIC 3000, Australia
- Ian Potter NanoBiosensing Facility, NanoBiotechnology Research Laboratory (NBRL), RMIT University, Melbourne, VIC 3000, Australia
| | - Selvakannan Periasamy
- School of Science, RMIT University, Melbourne, VIC 3000, Australia
- Centre for Advanced Materials and Industrial Chemistry, RMIT University, Melbourne, VIC 3000, Australia
| | - Gary Bryant
- School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Ravi Shukla
- School of Science, RMIT University, Melbourne, VIC 3000, Australia
- Ian Potter NanoBiosensing Facility, NanoBiotechnology Research Laboratory (NBRL), RMIT University, Melbourne, VIC 3000, Australia
- Centre for Advanced Materials and Industrial Chemistry, RMIT University, Melbourne, VIC 3000, Australia
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Sarkar S, Mishra A, Periasamy S, Dyett B, Dogra P, Ball AS, Yeo LY, White JF, Wang Z, Cristini V, Jagannath C, Khan A, Soni SK, Drummond CJ, Conn CE. Prospective Subunit Nanovaccine against Mycobacterium tuberculosis Infection─Cubosome Lipid Nanocarriers of Cord Factor, Trehalose 6,6' Dimycolate. ACS Appl Mater Interfaces 2023. [PMID: 37262346 DOI: 10.1021/acsami.3c04063] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
An improved vaccine is urgently needed to replace the now more than 100-year-old Bacillus Calmette-Guérin (BCG) vaccine against tuberculosis (TB) disease, which represents a significant burden on global public health. Mycolic acid, or cord factor trehalose 6,6' dimycolate (TDM), a lipid component abundant in the cell wall of the pathogen Mycobacterium tuberculosis (MTB), has been shown to have strong immunostimulatory activity but remains underexplored due to its high toxicity and poor solubility. Herein, we employed a novel strategy to encapsulate TDM within a cubosome lipid nanocarrier as a potential subunit nanovaccine candidate against TB. This strategy not only increased the solubility and reduced the toxicity of TDM but also elicited a protective immune response to control MTB growth in macrophages. Both pre-treatment and concurrent treatment of the TDM encapsulated in lipid monoolein (MO) cubosomes (MO-TDM) (1 mol %) induced a strong proinflammatory cytokine response in MTB-infected macrophages, due to epigenetic changes at the promoters of tumor necrosis factor alpha (TNF-α) and interleukin 6 (IL-6) in comparison to the untreated control. Furthermore, treatment with MO-TDM (1 mol %) cubosomes significantly improved antigen processing and presentation capabilities of MTB-infected macrophages to CD4 T cells. The ability of MO-TDM (1 mol %) cubosomes to induce a robust innate and adaptive response in vitro was further supported by a mathematical modeling study predicting the vaccine efficacy in vivo. Overall, these results indicate a strong immunostimulatory effect of TDM when delivered through the lipid nanocarrier, suggesting its potential as a novel TB vaccine.
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Affiliation(s)
- Sampa Sarkar
- School of Science, STEM College, RMIT University, Melbourne 3001, Victoria, Australia
| | - Abhishek Mishra
- Department of Pathology and Genomic Medicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
| | - Selvakannan Periasamy
- School of Science, STEM College, RMIT University, Melbourne 3001, Victoria, Australia
| | - Brendan Dyett
- School of Science, STEM College, RMIT University, Melbourne 3001, Victoria, Australia
| | - Prashant Dogra
- Mathematics in Medicine Program, Houston Methodist Research Institute, Houston, Texas 77030, United States
- Department of Physiology and Biophysics, Weill Cornell Medical College, New York, New York 10021, United States
| | - Andrew S Ball
- School of Science, STEM College, RMIT University, Melbourne 3001, Victoria, Australia
| | - Leslie Y Yeo
- School of Engineering, STEM College, RMIT University, Melbourne 3001, Victoria, Australia
| | - Jacinta F White
- The Commonwealth Scientific and Industrial Research Organisation, Clayton 3169, Victoria, Australia
| | - Zhihui Wang
- Mathematics in Medicine Program, Houston Methodist Research Institute, Houston, Texas 77030, United States
- Department of Physiology and Biophysics, Weill Cornell Medical College, New York, New York 10021, United States
- Neal Cancer Center, Houston Methodist Research Institute, Houston, Texas 77030, United States
| | - Vittorio Cristini
- Mathematics in Medicine Program, Houston Methodist Research Institute, Houston, Texas 77030, United States
- Neal Cancer Center, Houston Methodist Research Institute, Houston, Texas 77030, United States
- Department of Imaging Physics, University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030, United States
- Physiology, Biophysics, and Systems Biology Program, Graduate School of Medical Sciences, Weill Cornell Medicine, New York, New York 10021, United States
| | - Chinnaswamy Jagannath
- Department of Pathology and Genomic Medicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
| | - Arshad Khan
- Department of Pathology and Genomic Medicine, Houston Methodist Research Institute, Houston, Texas 77030, United States
| | - Sarvesh K Soni
- School of Science, STEM College, RMIT University, Melbourne 3001, Victoria, Australia
| | - Calum J Drummond
- School of Science, STEM College, RMIT University, Melbourne 3001, Victoria, Australia
| | - Charlotte E Conn
- School of Science, STEM College, RMIT University, Melbourne 3001, Victoria, Australia
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Sun J, Yamaguchi D, Tang L, Periasamy S, Ma H, Hart JN, Chiang K. Enhancement of oxygen exchanging capability by loading a small amount of ruthenium over ceria-zirconia on dry reforming of methane. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.103407] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mehla S, Das J, Jampaiah D, Periasamy S, Nafady A, Bhargava SK. Recent advances in preparation methods for catalytic thin films and coatings. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00518h] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Advancements in the preparation methods and applications of catalytic thin films and coatings are briefly summarized.
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Affiliation(s)
- Sunil Mehla
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Science
- RMIT University
- Melbourne
- Australia
| | - Jagannath Das
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Science
- RMIT University
- Melbourne
- Australia
| | - Deshetti Jampaiah
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Science
- RMIT University
- Melbourne
- Australia
| | - Selvakannan Periasamy
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Science
- RMIT University
- Melbourne
- Australia
| | - Ayman Nafady
- Department of Chemistry
- College of Science
- King Saud University
- Riyadh 11451
- Saudi Arabia
| | - Suresh K. Bhargava
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Science
- RMIT University
- Melbourne
- Australia
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Gupta SSR, Nakhate AV, Deshmukh GP, Periasamy S, Samudrala PS, Bhargava SK, Lakshmi Kantam M. Direct Synthesis of Amides from Oxidative Coupling of Benzyl Alcohols or Benzylamines with N
-Substituted Formamides Using a Cu-Fe-Based Heterogeneous Catalyst. ChemistrySelect 2018. [DOI: 10.1002/slct.201801297] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Shyam Sunder R. Gupta
- Department of Chemical Engineering; Institute of Chemical Technology, N.P. Marg, Matunga; Mumbai-400 019 India
| | - Akhil V. Nakhate
- Department of Chemical Engineering; Institute of Chemical Technology, N.P. Marg, Matunga; Mumbai-400 019 India
| | - Gunjan P. Deshmukh
- Department of Chemical Engineering; Institute of Chemical Technology, N.P. Marg, Matunga; Mumbai-400 019 India
| | - Selvakannan Periasamy
- Centre for Advanced Materials & Industrial Chemistry (CAMIC); School of Applied Sciences; RMIT University, GPO BOX 2476; Melbourne-3001 Australia
| | - Priya S. Samudrala
- Centre for Advanced Materials & Industrial Chemistry (CAMIC); School of Applied Sciences; RMIT University, GPO BOX 2476; Melbourne-3001 Australia
| | - Suresh K. Bhargava
- Centre for Advanced Materials & Industrial Chemistry (CAMIC); School of Applied Sciences; RMIT University, GPO BOX 2476; Melbourne-3001 Australia
| | - Mannepalli Lakshmi Kantam
- Department of Chemical Engineering; Institute of Chemical Technology, N.P. Marg, Matunga; Mumbai-400 019 India
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Joshi S, Ippolito SJ, Periasamy S, Sabri YM, Sunkara MV. Efficient Heterostructures of Ag@CuO/BaTiO 3 for Low-Temperature CO 2 Gas Detection: Assessing the Role of Nanointerfaces during Sensing by Operando DRIFTS Technique. ACS Appl Mater Interfaces 2017; 9:27014-27026. [PMID: 28741353 DOI: 10.1021/acsami.7b07051] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Tetragonal BaTiO3 spheroids synthesized by a facile hydrothermal route using Tween 80 were observed to be polydispersed with a diameter in the range of ∼15-75 nm. Thereon, BaTiO3 spheroids were decorated with different percentages of Ag@CuO by wet impregnation, and their affinity toward carbon dioxide (CO2) gas when employed as sensitive layers in a microsensor was investigated. The results revealed that the metal nanocomposite-based sensor had an exceptional stability and sensitivity toward CO2 gas (6-fold higher response), with appreciable response and recovery times (<10 s) and higher repeatability (98%) and accuracy (96%) at a low operating temperature of 120 °C, compared to those of pure BaTiO3 and CuO. Such improved gas-sensing performances even at a very low concentration (∼700 ppm) is attributable to both the chemical and electrical contributions of Ag@CuO forming intermittent nanointerfaces with BaTiO3 spheroids, exhibiting unique structural stability. The CO2-sensing mechanism of CuO/BaTiO3 nanocomposite was studied by the diffuse reflectance infrared Fourier transform spectroscopy technique that established the reaction of CO2 with BaO and CuO to form the respective carbonate species that is correlated with the change in material resistance consequently monitored as sensor response.
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Affiliation(s)
- Shravanti Joshi
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, College of Science, Engineering & Health and ‡School of Engineering, College of Science, Engineering & Health, RMIT University , Melbourne, VIC 3001, Australia
- RMIT-IICT Research Centre and ∥Inorganic & Physical Chemistry Division, Nanomaterials Laboratory, CSIR-Indian Institute of Chemical Technology , Hyderabad 500007, India
| | - Samuel J Ippolito
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, College of Science, Engineering & Health and ‡School of Engineering, College of Science, Engineering & Health, RMIT University , Melbourne, VIC 3001, Australia
- RMIT-IICT Research Centre and ∥Inorganic & Physical Chemistry Division, Nanomaterials Laboratory, CSIR-Indian Institute of Chemical Technology , Hyderabad 500007, India
| | - Selvakannan Periasamy
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, College of Science, Engineering & Health and ‡School of Engineering, College of Science, Engineering & Health, RMIT University , Melbourne, VIC 3001, Australia
- RMIT-IICT Research Centre and ∥Inorganic & Physical Chemistry Division, Nanomaterials Laboratory, CSIR-Indian Institute of Chemical Technology , Hyderabad 500007, India
| | - Ylias M Sabri
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, College of Science, Engineering & Health and ‡School of Engineering, College of Science, Engineering & Health, RMIT University , Melbourne, VIC 3001, Australia
- RMIT-IICT Research Centre and ∥Inorganic & Physical Chemistry Division, Nanomaterials Laboratory, CSIR-Indian Institute of Chemical Technology , Hyderabad 500007, India
| | - Manorama V Sunkara
- Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, College of Science, Engineering & Health and ‡School of Engineering, College of Science, Engineering & Health, RMIT University , Melbourne, VIC 3001, Australia
- RMIT-IICT Research Centre and ∥Inorganic & Physical Chemistry Division, Nanomaterials Laboratory, CSIR-Indian Institute of Chemical Technology , Hyderabad 500007, India
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9
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Narnaware S, Periasamy S, Tripathi B. Studies on pathology, cytokine gene expression and molecular typing of Mycobacterium avium subsp. paratuberculosis of naturally occurring Johne's disease in bullocks. Res Vet Sci 2016; 106:74-80. [DOI: 10.1016/j.rvsc.2016.03.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2015] [Revised: 02/25/2016] [Accepted: 03/13/2016] [Indexed: 11/26/2022]
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Naidu LD, Saravanan S, Goel M, Periasamy S, Stroeve P. A novel technique for detoxification of phenol from wastewater: Nanoparticle Assisted Nano Filtration (NANF). J Environ Health Sci Eng 2016; 14:9. [PMID: 27226897 PMCID: PMC4879755 DOI: 10.1186/s40201-016-0249-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 05/09/2016] [Indexed: 06/05/2023]
Abstract
BACKGROUND Phenol is one of the most versatile and important organic compound. It is also a growing concern as water pollutants due to its high persistence and toxicity. Removal of Phenol from wastewaters was investigated using a novel nanoparticle adsorption and nanofiltration technique named as Nanoparticle Assisted Nano Filtration (NANF). METHODS The nanoparticle used for NANF study were silver nanoparticles and synthesized to three distinct average particle sizes of 10 nm, 40 nm and 70 nm. The effect of nanoparticle size, their concentrations and their tri and diparticle combinations upon phenol removal were studied. RESULTS Total surface areas (TSA) for various particle size and concentrations have been calculated and the highest was 4710 × 10(12 )nm(2 )for 10 nm particles and 180 ppm concentration while the lowest was for 2461 × 10(11) for 70 nm and 60 ppm concentrations. Tri and diparticle studies showed more phenol removal % than that of their individual particles, particularly for using small particles on large membrane pore size and large particles at low concentrations. These results have also been confirmed with COD and toxicity removal studies. CONCLUSIONS The combination of nanoparticles adsorption and nanofiltration results in high phenol removal and mineralization, leading to the conclusion that NANF has very high potential for treating toxic chemical wastewaters.
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Affiliation(s)
- L. D. Naidu
- />Department of Chemical Engineering, National Institute of Technology, Tiruchirapalli, 15 India
| | - S. Saravanan
- />Department of Chemical Engineering, National Institute of Technology, Tiruchirapalli, 15 India
| | - Mukesh Goel
- />Center for Environmental Engineering, PRIST University, Thanjavur, India
| | - S. Periasamy
- />Department of Textile Technology, PSG College of Technology, Coimbatore, India
| | - Pieter Stroeve
- />Department of Chemical Engineering, University of California Davis, Davis, CA 95616 USA
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11
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Periasamy S, Menon T. Epidemiology and in vitro susceptibilities of candida albicans isolated from HIV patients in South India. Int J Infect Dis 2016. [DOI: 10.1016/j.ijid.2016.02.689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Dutt S, Siril PF, Sharma V, Periasamy S. Goldcore–polyanilineshell composite nanowires as a substrate for surface enhanced Raman scattering and catalyst for dye reduction. NEW J CHEM 2015. [DOI: 10.1039/c4nj01521e] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The unique morphology of the nanocomposite is due to the confinement, typical diffusion path and the interaction between PANI and Au-nanoparticles.
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Affiliation(s)
- Sunil Dutt
- School of Basic Sciences
- Indian Institute of Technology
- Mandi-175005
- India
| | - Prem Felix Siril
- School of Basic Sciences
- Indian Institute of Technology
- Mandi-175005
- India
| | - Vipul Sharma
- School of Basic Sciences
- Indian Institute of Technology
- Mandi-175005
- India
| | - Selvakannan Periasamy
- Center for Advanced Materials and Industrial Chemistry
- School of Applied Sciences
- RMIT University
- Australia
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Gopalan S, Bose JC, Periasamy S. Anastomotic Recurrence of Colon Cancer-is it a Local Recurrence, a Second Primary, or a Metastatic Disease (Local Manifestation of Systemic Disease)? Indian J Surg 2014; 77:232-6. [PMID: 26246708 DOI: 10.1007/s12262-014-1074-x] [Citation(s) in RCA: 10] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 04/03/2014] [Indexed: 12/29/2022] Open
Abstract
The aim of this study is to review the literature to find out the exact etiology of anastomotic cancers of colon post resection and differentiate them between a recurrence, second primary, and metastatic disease (local manifestation of systemic disease). Web-based literature search was done, and datas collected. We searched PubMed for papers using the keywords colon cancer recurrence, anastomotic recurrence, and recurrent colon carcinoma. We also searched for systematic review in the same topic. In addition, we used our personal referrence archive. Anastomotic recurrences of colon are postulated to arise due to inadequate margins, tumor implantation by exfoliated cells, altered biological properties of bowel anastomosis, and missed synchronous lesions. Some tumors are unique with repeated recurrence after repeated resection. Duration after primary surgery plays a major role in differentiating recurrent and second primary lesions. Repeated recurrences after repeated resections have to be considered a manifestation of systemic disease or metastatic disease due to the virulence of the disease. A detailed analysis and study of patients with colonic anastomotic lesion are required to differentiate it between a recurrent, a second primary lesion, and a metastatic disease (local manifestation of a systemic disease). The nomenclature is significant to study the survival of these patients, as a second primary lesion will have different survival compared to that of recurrent lesions.
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Affiliation(s)
- Sathiyavelavan Gopalan
- Department of Surgical Oncology, Rajiv Gandhi Government General Hospital, Chennai, Tamilnadu India
| | - Jagadesh Chandra Bose
- Department of Surgical Oncology, Rajiv Gandhi Government General Hospital, Chennai, Tamilnadu India
| | - S Periasamy
- Department of Surgical Oncology, Rajiv Gandhi Government General Hospital, Chennai, Tamilnadu India
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Abstract
Pasteurella multocida serotype A:3 has been mostly implicated in pneumonic pasteurellosis in ruminants. In contrast, our previous studies have reported that both serotypes A:1 and A:3 were responsible for respiratory diseases in cattle and buffaloes. However, the pathology and pathogenesis of P. multocida serotype A:1 (Pm A:1) infection have not been studied in ruminants. In the present study, 12- to 15-week-old buffalo calves (Bubalus bubalis) infected by Pm A:1 had fibrinous and suppurative bronchopneumonia with focal areas of coagulation necrosis typical of pneumonic pasteurellosis. For the first time, this study reports the lung pathology and pathogenecity of Pm A:1 infection in calves.
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Affiliation(s)
- P E Praveena
- Division of Veterinary Pathology, Indian Veterinary Research Institute (IVRI), Izatnagar, India
| | - S Periasamy
- Division of Veterinary Pathology, Indian Veterinary Research Institute (IVRI), Izatnagar, India
| | - A A Kumar
- Division of Bacteriology, Indian Veterinary Research Institute (IVRI), Izatnagar, India
| | - N Singh
- Division of Veterinary Pathology, Indian Veterinary Research Institute (IVRI), Izatnagar, India
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15
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Subramani T, Senthilkumar K, Periasamy S, Rao S. Expression of angiotensin II and its receptors in cyclosporine-induced gingival overgrowth. J Periodontal Res 2012; 48:386-91. [PMID: 23106187 DOI: 10.1111/jre.12020] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/09/2012] [Indexed: 12/14/2022]
Abstract
BACKGROUND AND OBJECTIVES The renin-angiotensin system (RAS) is considered as a hormonal circulatory system involved in maintaining blood pressure, electrolyte and fluid homeostasis. RAS components can be synthesized in local tissues and are found to play a role in gingival overgrowth. The drug-induced gingival overgrowth (DIGO) is a fibrotic condition, which is associated with multiple factors, including inflammation and adverse drug effects such as cyclosporine A. This study was directed forward to the identification of the angiotensinogen, angiotensin II (Ang II) and its receptors AT₁ /AT₂ expression in DIGO tissues and cyclosporine-treated human gingival fibroblast cells. MATERIAL AND METHODS Gingival samples were obtained from patients with cyclosporine-induced gingival overgrowth, chronic periodontitis and normal healthy subjects. The total RNA was isolated and reverse transcription-polymerase chain reaction was performed for angiotensinogen, Ang II and AT₁ /AT₂ receptor. Ang II protein was estimated from tissue by enzyme immunoassay. The expression of Ang II and its receptors were also examined in gingival fibroblast cells treated with cyclosporine. RESULTS Ang II mRNA and protein expression was significantly higher in patients with DIGO than in patients with periodontitis and healthy subjects. The AT₁ mRNA was expressed more than AT₂ in all examined tissues. In gingival fibroblasts, Ang II and AT₁ expressions were increased with cyclosporine incorporation compared to controls. CONCLUSION These results suggest that cyclosporine can modulate local expression of RAS components such as angiotensinogen, Ang II and its receptors in gingival tissues and gingival fibroblast cells.
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Affiliation(s)
- T Subramani
- Department of Periodontics, Sri Ramachandra Dental College and Hospital, Sri Ramachandra University, Chennai, India
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Kadirvel G, Periasamy S, Kumar S. Effect of cryopreservation on apoptotic-like events and its relationship with cryocapacitation of buffalo (Bubalus bubalis) sperm. Reprod Domest Anim 2011; 47:143-50. [PMID: 21676035 DOI: 10.1111/j.1439-0531.2011.01818.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This study investigated the apoptosis-like events associated with cryopreservation process and their relationship with cryocapacitation in buffalo (Bubalus bubalis) sperm. A total of 49 semen ejaculates from seven bulls were studied for structural changes in sperm following cryopreservation. Apoptotic changes were detected by assays specific for translocation of phosphatidylserine (PS) to the cell surface, alterations in membrane permeability and mitochondrial membrane potential (MMP), and DNA integrity. A significant (p < 0.01) percentage of cryopreserved sperm showed externalization of PS and early apoptotic changes and lowered MMP when compared with the fresh sperm. Freezing and thawing of sperm increased permeability to YOPRO-1, an impermeant fluorescent dye. However, on TUNEL staining, cryopreserved sperm showed no breach in DNA integrity. The sperm capacitation status was evaluated by chlortetracycline (CTC) fluorescence pattern, in which a significant (p < 0.01) percentage of cryopreserved sperm were found to be capacitated. The capacitated sperm (Pattern B) was positively correlated with the aforementioned apoptotic events. In conclusion, cryopreservation process induced early apoptosis-like changes in buffalo sperm, and a close link exists between cryocapacitation and apoptosis during cryopreservation of sperm.
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Affiliation(s)
- G Kadirvel
- Division of Animal Reproduction Pathology, Indian Veterinary Research Institute, Izatnagar, India.
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Abstract
Dopamine D(4) receptors in the nucleus accumbens shell (AcbSh) are thought to play a key role in mediating the locomotor and sensitizing affects of psychostimulants, as well as the therapeutic efficacy of atypical antipsychotic drugs. We used electron microscopic immunocytochemistry to determine the functional sites for endogenous and exogenous D(4) receptor activation in this region. Of 1,090 D(4) receptor-labeled profiles observed in the AcbSh of rat brain, 65% were axons and axon terminals, while 22% were dendrites and dendritic spines. Within axons and terminals, D(4) receptor immunoreactivity was localized to segments of the plasma membrane and membranes of nearby vesicles. The axon terminals were morphologically heterogenous, varying in size and content of either all small synaptic vesicles (ssv), or ssv and large dense-core vesicles. The labeled terminals occasionally formed asymmetric excitatory-type axospinous synapses, but the majority were without recognizable synaptic specializations. In a separate series of tissue sections that were processed for dual-labeling of the D(4) receptor and the catecholamine synthesizing enzyme, tyrosine hydroxylase (TH), 56% of all observed associations were appositions between differentially labeled axonal profiles, and 17% were terminals that contained immunoreactivity for both antigens. Dendritic spines containing D(4) receptor-labeling also received convergent input from TH-immunoreactive terminals and unlabeled terminals forming asymmetric synapses. These results provide the first ultrastructural evidence for a major presynaptic, and a more minor postsynaptic, involvement of D(4) receptors in dopaminergic modulation of excitatory transmission in the AcbSh.
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Affiliation(s)
- A L Svingos
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10021, USA.
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Svingos AL, Periasamy S, Pickel VM. Dopamine D4 receptors are strategically localized for primary involvement in the presynaptic effects of dopamine in the rat nucleus accumbens shell. Ann N Y Acad Sci 1999; 877:679-83. [PMID: 10415682 DOI: 10.1111/j.1749-6632.1999.tb09300.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A L Svingos
- Department of Neurology and Neuroscience, Cornell University Medical College, New York, New York 10021, USA.
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