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Kumar JSM, Kumar TSM, Chandrasekar M, Ganesan C, Senthilkumar K, Siengchin S. A review on free vibration characteristics of natural fiber reinforced polymer composites. PROCEEDINGS OF THE 1ST INTERNATIONAL CONFERENCE ON FRONTIER OF DIGITAL TECHNOLOGY TOWARDS A SUSTAINABLE SOCIETY 2023. [DOI: 10.1063/5.0113434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
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Senthilkumar K, Ravikumar G, Parthiban ABR. Status of Urinary shedders of Leptospires among cattle in Tamilnadu: Implications on zoonosis. Vet Ital 2022; 58. [PMID: 36586111 DOI: 10.12834/vetit.2478.16135.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Accepted: 09/02/2021] [Indexed: 01/01/2023]
Abstract
Bovine leptospirosis causes jaundice, mastitis, infertility, abortion, and death of the animal. This research aimed to study the status of urinary shedders of pathogenic Leptospira among the cattle population and identify the infecting serogroup circulating in this region. A total of 305 blood and 305 urine samples were collected from organized farms (n = 44), individually housed animals (n = 81) and animals from the slaughterhouse (n = 180). Microscopic agglutination test was carried out to detect anti‑leptospiral antibodies. Dark‑field microscopic examination and culture of urine were done to detect and isolate the Leptospira. The isolated Leptospira were identified by cross‑agglutination test and gene sequencing. PCR and real‑time PCR were carried out to detect leptospiral genomic DNA in urine samples to detect the shedders. The anti‑leptospiral antibodies were detected in 6.2% of animals. The Leptospira genomic DNA was detected in 9.2% (28 of 305) of urine samples. Of the 28 Leptospira positive urine samples, 39.2% were from animals with clinical signs suggestive of leptospirosis and 60.8% Leptospira positive samples were from slaughterhouse animals. The Leptospira isolated were identified as Leptospira interrogans serogroup Sejroe and Hebdomadis. The present study demonstrates the need to include leptospirosis in cattle health surveillance programmes to prevent leptospirosis by vaccination, preventing renal carriage.
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Affiliation(s)
- K Senthilkumar
- Zoonoses Research Laboratory, Centre for Animal Health Studies, TANUVAS, Chennai 60051.
| | - G Ravikumar
- Translational Research Platform for Veterinary Biologicals, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu, India.
| | - Aravindh Babu R Parthiban
- Translational Research Platform for Veterinary Biologicals, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu, India.
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Manonmani G, Sandhiya L, Senthilkumar K. A Computational Perspective on the Chemical Reaction of HFO-1234zc with the OH Radical in the Gas Phase and in the Presence of Mineral Dust. J Phys Chem A 2022; 126:9564-9576. [PMID: 36534504 DOI: 10.1021/acs.jpca.2c03229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The gas phase and heterogeneous reaction on mineral dust aerosols of trace gases could significantly affect the tropospheric oxidation capacity and aerosol composition of the atmosphere. In this work, the OH radical-initiated oxidation of a hydrofluoroolefin, HFO-1234zc, and subsequent reaction of favorable intermediates with other reactive species, such as O2, HO2, and NOx (x = 1-2) radicals, were studied, and the role of mineral dust in the form of silicate clusters on the reaction mechanism and rate constant was studied. In the gas phase, OH radical addition to HFO-1234zc is kinetically more favorable than the H-atom abstraction reaction. The calculated reaction energy barrier and thermochemical parameters show that both the initial reactions are more feasible on silicate clusters. Thus, silicates can act as chemical sinks for trapping of hydrofluoroolefins (HFOs). It is found that both gas-phase and heterogeneous reactions are responsible for the transformation of HFOs into fluorinated compounds in the atmosphere. Further, the results show that the ozone creation potential of HFO-1234zc is low, and few of the products are harmful to aquatic organisms. This study provides new insights on the formation of toxic pollutants from the oxidation of HFO-1234zc, which may have significant implications in the troposphere.
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Affiliation(s)
- G Manonmani
- Department of Physics, Bharathiar University, Coimbatore641 046, India
| | - L Sandhiya
- CSIR-National Institute of Science Communication and Policy Research, New Delhi110012, India
| | - K Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore641 046, India
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Parthiban S, Ramesh A, Karuppannan AK, Dhinakar Raj G, Hemalatha S, Parthiban M, Senthilkumar K, Balasubramaniyam D, Sumanth Kumar R, Ranganatha S, Ravishankar C. Isolation and genetic analysis of Porcine circovirus 2 in southern India evidences high circulation of Porcine circovirus 2d genotype. Mol Biol Rep 2022; 49:11829-11846. [PMID: 36214948 DOI: 10.1007/s11033-022-07946-5] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 09/13/2022] [Indexed: 10/17/2022]
Abstract
BACKGROUND Porcine circovirus 2 is globally noted swine pathogen with multiple genotypes associated with vast clinical and subclinical outcomes. This study aimed to isolate and characterize PCV2 genotypes circulating in southern states of India. METHODS AND RESULTS A total of 434 field samples comprising of serum (n = 273), tissues (n = 109) and swabs (n = 52) collected from swine during 2019 to 2021 from southern states of India were screened for PCV2 by specific polymerase chain reaction (PCR) assay. Molecular prevalence of PCV2 in southern India was found to be 12.21% (n = 53). All the 53 PCV2 positive samples were further subjected to the PCR assay with designed primers targeting full length amplification of ORF2 gene of PCV2 for molecular characterization. Randomly 32 positive samples by full length PCV2-ORF2 gene PCR were sequenced for genotyping. Signature motif and phylogenetic analysis of 32 PCV2 sequences revealed 62.5% (n = 20) prevalence of PCV2d genotype followed by 21.8% (n = 7) of PCV2h or PCV2-IM1 and 15.6% (n = 5) of PCV2b genotypes. Twenty five PCR positive field samples were subjected for virus isolation in PK15 cells and characterized. Out of 25 samples processed 5 (20%) PCV2 isolates obtained in this study were confirmed by PCR and immune fluorescence assay. Molecular characterization of PK15 adapted five PCV2 isolates confirmed circulation of PCV2d, PCV2h and PCV2b genotypes in pigs under field conditions in southern India. CONCLUSIONS Isolation and molecular epidemiological study of PCV2 in southern states of India evidences high circulation of PCV2d genotypes in field conditions in comparison to other genotypes.
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Affiliation(s)
- S Parthiban
- Department of Animal Biotechnology, Madras Veterinary College, Chennai, 600 007, India
| | - A Ramesh
- Vaccine Research Centre-Viral Vaccines, CAHS, MMC, Chennai, 600 051, India. .,Tamil Nadu Veterinary and Animal Sciences University, Chennai, 600 051, India.
| | | | - G Dhinakar Raj
- Department of Animal Biotechnology, Madras Veterinary College, Chennai, 600 007, India
| | - S Hemalatha
- Department of Veterinary Pathology, MVC, Chennai, 600 007, India
| | - M Parthiban
- Department of Animal Biotechnology, Madras Veterinary College, Chennai, 600 007, India
| | - K Senthilkumar
- Post Graduate Research Institute in Animal Sciences, Kattupakkam, Chennai, 603 203, India
| | - D Balasubramaniyam
- Post Graduate Research Institute in Animal Sciences, Kattupakkam, Chennai, 603 203, India
| | - R Sumanth Kumar
- Institute of Animal Health and Veterinary Biologicals, Bengaluru, 560 024, India
| | - S Ranganatha
- Institute of Animal Health and Veterinary Biologicals, Bengaluru, 560 024, India
| | - Chintu Ravishankar
- Department of Veterinary Microbiology, COVAS, Pookode, Kerala Veterinary and Animal Sciences University, Pookode, India
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Siltari A, Lönnerbro R, Pang K, Shiranov K, Asiimwe A, Evans-Axelsson S, Franks B, Kiran A, Murtola TJ, Schalken J, Steinbeisser C, Bjartell A, Auvinen A, Smith E, N'Dow J, Plass K, Ribal M, Mottet N, Moris L, Lardas M, Van den Broeck T, Willemse PP, Gandaglia G, Campi R, Greco I, Gacci M, Serni S, Briganti A, Crosti D, Meoni M, Garzonio R, Bangma R, Roobol M, Remmers S, Tilki D, Visakorpi T, Talala K, Tammela T, van Hemelrijck M, Bayer K, Lejeune S, Taxiarchopoulou G, van Diggelen F, Senthilkumar K, Schutte S, Byrne S, Fialho L, Cardone A, Gono P, De Vetter M, Ceke K, De Meulder B, Auffray C, Balaur IA, Taibi N, Power S, Kermani NZ, van Bochove K, Cavelaars M, Moinat M, Voss E, Bernini C, Horgan D, Fullwood L, Holtorf M, Lancet D, Bernstein G, Omar I, MacLennan S, Maclennan S, Healey J, Huber J, Wirth M, Froehner M, Brenner B, Borkowetz A, Thomas C, Horn F, Reiche K, Kreux M, Josefsson A, Tandefekt DG, Hugosson J, Huisman H, Hofmacher T, Lindgren P, Andersson E, Fridhammar A, Vizcaya D, Verholen F, Zong J, Butler-Ransohoff JE, Williamson T, Chandrawansa K, Dlamini D, waldeck R, Molnar M, Bruno A, Herrera R, Jiang S, Nevedomskaya E, Fatoba S, Constantinovici N, Maass M, Torremante P, Voss M, Devecseri Z, Cuperus G, Abott T, Dau C, Papineni K, Wang-Silvanto J, Hass S, Snijder R, Doye V, Wang X, Garnham A, Lambrecht M, Wolfinger R, Rogiers S, Servan A, Lefresne F, Caseriego J, Samir M, Lawson J, Pacoe K, Robinson P, Jaton B, Bakkard D, Turunen H, Kilkku O, Pohjanjousi P, Voima O, Nevalaita L, Reich C, Araujo S, Longden-Chapman E, Burke D, Agapow P, Derkits S, Licour M, McCrea C, Payne S, Yong A, Thompson L, Lujan F, Bussmann M, Köhler I. How well do polygenic risk scores identify men at high risk for prostate cancer? Systematic review and meta-analysis. Clin Genitourin Cancer 2022; 21:316.e1-316.e11. [PMID: 36243664 DOI: 10.1016/j.clgc.2022.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 09/01/2022] [Accepted: 09/06/2022] [Indexed: 11/27/2022]
Abstract
OBJECTIVES Genome-wide association studies have revealed over 200 genetic susceptibility loci for prostate cancer (PCa). By combining them, polygenic risk scores (PRS) can be generated to predict risk of PCa. We summarize the published evidence and conduct meta-analyses of PRS as a predictor of PCa risk in Caucasian men. PATIENTS AND METHODS Data were extracted from 59 studies, with 16 studies including 17 separate analyses used in the main meta-analysis with a total of 20,786 cases and 69,106 controls identified through a systematic search of ten databases. Random effects meta-analysis was used to obtain pooled estimates of area under the receiver-operating characteristic curve (AUC). Meta-regression was used to assess the impact of number of single-nucleotide polymorphisms (SNPs) incorporated in PRS on AUC. Heterogeneity is expressed as I2 scores. Publication bias was evaluated using funnel plots and Egger tests. RESULTS The ability of PRS to identify men with PCa was modest (pooled AUC 0.63, 95% CI 0.62-0.64) with moderate consistency (I2 64%). Combining PRS with clinical variables increased the pooled AUC to 0.74 (0.68-0.81). Meta-regression showed only negligible increase in AUC for adding incremental SNPs. Despite moderate heterogeneity, publication bias was not evident. CONCLUSION Typically, PRS accuracy is comparable to PSA or family history with a pooled AUC value 0.63 indicating mediocre performance for PRS alone.
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Parthiban S, Ramesh A, Dhinakar Raj G, Karuppannan AK, Hemalatha S, Parthiban M, Ravishankar C, Senthilkumar K, Balasubramaniyam D. Molecular evidence of porcine circovirus 3 infection in swine: first report in southern India. Virusdisease 2022; 33:284-290. [PMID: 36277416 PMCID: PMC9481802 DOI: 10.1007/s13337-022-00778-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 07/02/2022] [Indexed: 11/29/2022] Open
Abstract
The present study examined 434 field samples including serum (n = 273), swabs from natural orifices (n = 52) and postmortem tissue samples (n = 109) from both suspected and asymptomatic swine from Andhra Pradesh, Karnataka, Kerala, Pondicherry, Tamil Nadu, and Telangana states in southern India. All the samples were processed for molecular screening of PCV3 by specific PCR assay. Overall molecular positivity rate of PCV3 was found to be 0.7% in southern India with one sample positive from each state of Tamil Nadu, Kerala and Telangana. All the three PCR positive PCV3 samples are detected from reproductive failures and were processed and propagated in PK15 cell line for virus isolation. Out of 3 samples processed, one (INDKL9PK76) PCV3 isolate could be obtained in this study and it was confirmed by specific PCR at third and fifth passage levels. Sequencing of PCV3 positive PCR amplicon (INDKL9PK76) revealed 1004 nucleotides and BLAST analysis confirmed partial sequence of the PCV3 genome. The aligned contig sequence was submitted to GenBank under the accession number of MW627201. PCV3 sequence in this study revealed 99% homology with PCV3 isolates from Europe and China. Phylogentic analysis of the PCV3 isolate-INDKL9PK76 sequence along with established PCV3 genotypes revealed clustering within PCV3 genotypes. Characterization of PCV3 (INDKL9PK76) isolate based on deduced amino acid composition of PCV3-capsid protein revealed "A" (alanine) and "R" (arginine) at 24th and 27th residues respectively confirming the incidence of PCV3a genotype. This study evidences PCV3 associated reproductive failure in domestic pigs for the first time in southern India.
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Affiliation(s)
- S. Parthiban
- Department of Animal Biotechnology, Faculty of Basic Sciences, Madras Veterinary College Campus, Tamil Nadu Veterinary and Animal Sciences University, Chennai, 600 007 India
| | - A. Ramesh
- Vaccine Research Centre-Viral Vaccines, CAHS, MMC, Chennai, 600 051 India
| | - G. Dhinakar Raj
- Department of Animal Biotechnology, Faculty of Basic Sciences, Madras Veterinary College Campus, Tamil Nadu Veterinary and Animal Sciences University, Chennai, 600 007 India
| | | | - S. Hemalatha
- Department of Veterinary Pathology, MVC, Chennai, 600 007 India
| | - M. Parthiban
- Department of Animal Biotechnology, Faculty of Basic Sciences, Madras Veterinary College Campus, Tamil Nadu Veterinary and Animal Sciences University, Chennai, 600 007 India
| | - Chintu Ravishankar
- Department of Veterinary Microbiology, COVAS, Kerala Veterinary and Animal Sciences University, Pookode, India
| | - K. Senthilkumar
- Post Graduate Research Institute in Animal Sciences, Kattupakkam, 603 203 India
| | - D. Balasubramaniyam
- Post Graduate Research Institute in Animal Sciences, Kattupakkam, 603 203 India
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Abstract
Over a couple of decades perovskite solar cells have become a highly promising photovoltaic technology. Choosing a dopant-free Hole-Transporting Material (HTM) that offers protection to a perovskite layer from oxidation is one of the viable strategies while addressing the stability of perovskite solar cell. In this line of interest, tetrathiafulvale (TTF) derivatives have shown promise in the past. However, studies that focus on small-molecule TTF derivatives as potential HTM options are scarce. The present study is an attempt to explore the applicability of a few TTF derivatives as HTM in a perovskite solar cell. Here four TTF derivatives, namely, TTF-1 (experimentally reported in a previous study), TTF-2, DBTTF1, and TMTSF1, were studied through electronic structure calculations. The properties concerning HTM, such as impact of adsorption on molecular structure, absorption spectra, distribution of frontier molecular orbitals, interaction energy between TTF derivative and MAPbI3 surface, and charge transfer at an interface, were analyzed. Results show that TTF-2 has the expected energy-level alignment, transparency in the visible range of solar spectrum, and good charge-injection ability at the interface with a perovskite layer. Hence, TTF-2 could be a potential hole-transporting material for a perovskite solar cell, and it can perform better than TTF-1.
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Affiliation(s)
- S Krishnan
- Department of Physics, Bharathiar University, Coimbatore 641 046, India
| | - K Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore 641 046, India
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Parthiban S, Sowndhraya RKV, Raja P, Parthiban M, Ramesh A, Raj GD, Senthilkumar K, Balasubramanyam D, Hemalatha S, Bharathi R, Ravishankar C, Parveen ST. Molecular detection of porcine parvovirus 1-associated reproductive failure in southern India. Trop Anim Health Prod 2022; 54:195. [PMID: 35655031 PMCID: PMC9162486 DOI: 10.1007/s11250-022-03194-8] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Accepted: 05/25/2022] [Indexed: 11/30/2022]
Abstract
This study used 56 aborted and stillborn fetuses from organized swine farms in Tamil Nadu and Kerala, southern states of India. All samples were screened by using a PCR assay that targets the NS1 gene for PPV. Furthermore, the PCR positive samples were subjected to amplification of the VP2 gene of PPV1 with designed primers and sequenced for further study. The PCR screening of 56 samples found that 14.3% (n = 8) were positive for PPV genome. According to VP2 gene–based PCR for PPV1, 897 bp specific amplicons were detected in all eight of the samples. Two of the eight positive samples (L17 and T5) were sequenced and annotated randomly. The BLAST analysis of contig sequence INDTNCHN-T5 revealed 100% sequence homology with Chinese PPV1genome, whereas sequence from INDTNCHN-L17 revealed 99.43% sequence homology with Spain, Chinese, and German. PPV1 sequences and both the sequences INDTNCHN-T5 and INDTNCHN-L17 were submitted to the GenBank under the accession numbers MW822566 and MW822567 respectively. A phylogenetic analysis of the sequences in this study revealed specific grouping along with PPV1 strains in cluster E. Amino acid analysis of both isolated sequences in addition to the reference sequence from PPV1 showed variations in position 215 (I to T) in both the isolates, variation at position 228 (Q to E) in T5 isolate and variations at position 59 (L to M) and 314 (K to E) in L17 isolate. This study represents the first report of PPV1 cluster E in Tamil Nadu, southern India.
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Affiliation(s)
- S Parthiban
- Department of Animal Biotechnology, Faculty of Basic Sciences, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai, 600 007, India.
| | - R K V Sowndhraya
- Sree Sastha Institute of Engineering and Technology, Chennai, India
| | - P Raja
- Department of Animal Biotechnology, Faculty of Basic Sciences, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai, 600 007, India
| | - M Parthiban
- Department of Animal Biotechnology, Faculty of Basic Sciences, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai, 600 007, India
| | - A Ramesh
- Vaccine Research Centre-Viral Vaccines, CAHS, MMC, Chennai-51, India
| | - G Dhinakar Raj
- Department of Animal Biotechnology, Faculty of Basic Sciences, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai, 600 007, India
| | - K Senthilkumar
- Post Graduate Research Institute in Animal Sciences, Kattupakkam, India
| | - D Balasubramanyam
- Post Graduate Research Institute in Animal Sciences, Kattupakkam, India
| | - S Hemalatha
- Department of Veterinary Pathology, MVC, Chennai, India
| | - R Bharathi
- Central University Laboratory, CAHS, MMC, Chennai, India
| | - Chintu Ravishankar
- Department of Veterinary Microbiology, COVAS, Pookode, Kerala Veterinary and Animal Sciences University, Kerala, India
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Senthilkumar K, Ravikumar G. Lateral flow assay for rapid serodiagnosis of bovine leptospirosis. Iran J Vet Res 2022; 23:7-11. [PMID: 35782352 PMCID: PMC9238931 DOI: 10.22099/ijvr.2021.41151.5974] [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] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Accepted: 12/13/2021] [Indexed: 11/11/2022]
Abstract
Background Leptospirosis is considered to be an economically important disease in bovine. The disease burden is not appropriately monitored due to cumbersome serological tests that could be performed only in established laboratories. This warrants the development of a field level rapid diagnostic test. Aims The study aimed to develop a lateral flow assay (LFA)-based pen-side diagnostic test to detect antibodies to Leptospira. Methods LFA strip was prepared with the heat extracted antigen from L. interrogans serovar Pomona. To assess the performance of the developed LFA, a total of 300 bovine serum samples with their clinical histories were used and the initial screening for Leptospira antibodies was performed by the standard microscopic agglutination test (MAT). The sensitivity, specificity, and agreement (kappa value) were calculated between developed LFA and MAT. The stability of LFA was evaluated on days 30, 60, 90, and 120. Results Out of 300 samples tested, 225 were positive, and 75 were negative on MAT and 208 were positive, and 92 were negative on LFA. The developed LFA had a sensitivity of 90.7% and a specificity of 94.7%. The results of the assay were substantially in agreement with MAT, with a kappa value of 0.79. The LFA strips were stable for 120 days at 4°C. Conclusion A Lateral flow assay-based rapid pen-side test was developed and its utility to diagnose bovine leptospirosis was evaluated.
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Affiliation(s)
- K. Senthilkumar
- Correspondence: K. Senthilkumar, Zoonoses Research Laboratory, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai 600051, Tamil Nadu, India. E-mail:
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Naveenkumar M, Senthilkumar K, Sampathkumar V, Anandakumar S, Thazeem B. Bio-energy generation and treatment of tannery effluent using microbial fuel cell. Chemosphere 2022; 287:132090. [PMID: 34523435 DOI: 10.1016/j.chemosphere.2021.132090] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [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: 06/01/2021] [Revised: 08/10/2021] [Accepted: 08/27/2021] [Indexed: 06/13/2023]
Abstract
In this study, Graphite Particle (GP) and Carbon Cloth (CC) are employed as anode electrodes to study both bio-energy generation, and decrease of Chemical Oxygen Demand (COD) simultaneously using tannery effluent. The influence of electrodes distance (10 cm and 20 cm) on electricity production was evaluated. COD removal level of GP (75%) and CC (60%), maximum power outputs for 10 cm distance (600 ± 5 mW m-2) & (500 ± 10 mW m-2) and for 20 cm distance (520 ± 5 mW m-2) and also (430 ± 20 mW m-2) GP and CC were noted correspondingly. The outcomes of different parameters of MFC namely pH, conductivity, COD concentration, membrane thickness and size of bio-energy generation from tannery effluent in the MFC were investigated. The experimental results reveal that electrode provides highest power output with 10 cm distance between anode and cathode chamber. As a result, GP electrode is gradually viable, biocompatible, effective and adaptable for field application in MFC. The GP electrode has high potential for more power output, when compared to the CC electrode. The MFC system performance was improved with increasing effluent COD concentration (2340-4720 ppm), anolyte conductivity (1.6-8.1 mS cm-1) and membrane area (9-20 cm2). The system working with conductivity of 8.1 mS cm-1 and its effluent COD concentration of 4720 ppm generated the maximum peak power density of 44.69 mW m-2 with respective current density of 109 mA m-2. The findings thus show that considerable power production and effluent treatment can be achieved by MFC.
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Affiliation(s)
- M Naveenkumar
- Department of Chemical Engineering, Kongu Engineering College, Erode, 638060, Tamil Nadu, India
| | - K Senthilkumar
- Department of Chemical Engineering, Kongu Engineering College, Erode, 638060, Tamil Nadu, India.
| | - V Sampathkumar
- Department of Civil Engineering, Kongu Engineering College, Erode, 638060, Tamil Nadu, India
| | - S Anandakumar
- Department of Civil Engineering, Kongu Engineering College, Erode, 638060, Tamil Nadu, India
| | - B Thazeem
- Integrated Rural Technology Centre (IRTC), Palakkad, India
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Jaishankar J, Senthilkumar K, Anantharamakrishnan R, Megha .. A Rare Site of Presentation of B Cell Lymphoblastic Lymphoma. JPRI 2021. [DOI: 10.9734/jpri/2021/v33i63a35224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Lymphoblastic lymphoma is seen accounting to about 2% of all the lymphomas and it is a neoplasm of precursor B cells. Lymphoblastic lymphoma is highly aggressive, but is now frequently curable with recent therapy. Lymphoblastic lymphoma is associated with radiation exposure and also exposure to pesticide. The lymphoblasts infiltrate nodal or extranodal structures and is commonly associated with large mediastinal masses with a high chances for spreading to bone marrow and the central nervous system. The prognosis in all age groups has drastically improved with the use of intensive ALL-type chemotherapy regimes, with a disease-free survival of 73-90% in children and 45-72% in adults.
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Krishnan S, Senthilkumar K. Modified fullerenes as acceptors in bulk heterojunction organic solar cells - a theoretical study. Phys Chem Chem Phys 2021; 23:27468-27476. [PMID: 34870653 DOI: 10.1039/d1cp04402h] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present study, electronic structure calculations were used to provide strategies for designing poly(3-hexylthiophene) (P3HT)-fullerene-derivative-based donor-acceptor materials for use in high-efficiency bulk heterojunction organic solar cells (BHJ OSCs). The work systematically analyses the impact of electron-donating and -withdrawing substituents on the opto-electronic properties of the fullerene structures. Parameters relating to the absorption spectra, orbital distributions, and energy ordering of the frontier molecular orbitals (FMO), the interactions between P3HT and the fullerene derivatives, and charge transfer across the interface were investigated. We found that substitution with the electron-withdrawing group NO2 enhances the electronic coupling between the fullerene and P3HT; however, it reduces the open-circuit voltage (VOC) of the OSC through lowering the LUMO energy level. Furthermore, the results show that substitution with an electron-withdrawing group (NO2) and electron-donating group (OCH3) can improve the power conversion efficiency (PCE) of the OSC, since this slightly improves the photon absorption abilities and charge transfer coupling at the interface without overly compromising VOC relative to PC61BM. Our study shows that alkyl chain modification in the PC61BM acceptor is a promising strategy for improving the performances of OSCs.
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Affiliation(s)
- S Krishnan
- Department of Physics, Bharathiar University, Coimbatore - 641 046, India.
| | - K Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore - 641 046, India.
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Manonmani G, Sandhiya L, Senthilkumar K. Mechanism, Kinetics, and Ecotoxicity Assessment of ·OH-Initiated Oxidation Reactions of Sulfoxaflor. J Phys Chem A 2021; 125:10052-10064. [PMID: 34755512 DOI: 10.1021/acs.jpca.1c05030] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ·OH-initiated reaction mechanism and kinetics of sulfoxaflor were investigated by using electronic structure calculations. The possible hydrogen atom and cyano group abstraction reaction pathways were studied, and the calculated thermochemical parameters show that the hydrogen atom abstraction from the C7 carbon atom is the more favorable reaction pathway. The subsequent reactions for the favorable intermediate (I4) with other atmospheric reactive species, such as O2, H2O, HO2·, and NOx· (x = 1, 2), were studied in detail. The products identified from the subsequent reactions could contribute to secondary organic aerosol (SOA) formation in the atmosphere. The intermediates and products formed from the initial and subsequent reactions are equally as toxic as the parent sulfoxaflor. At 298 K, the rate constant calculated for the formation of the favorable intermediate I4 is 2.54 × 10-12 cm3 molecule-1 s-1, which shows that the lifetime of sulfoxaflor is 54 h. The excited-state calculation performed through time-dependent density functional theory shows that the photolysis of the title molecule is unlikely in the atmosphere. The global warming potentials (GWPs) for different time horizons, photochemical ozone creation potential (POCP), and ecotoxicity analysis were also studied for the insecticide sulfoxaflor.
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Affiliation(s)
- G Manonmani
- Department of Physics, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
| | - L Sandhiya
- Council of Scientific and Industrial Research-National Institute of Science, Technology and Development Studies, New Delhi 110012, India
| | - K Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
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Anitha S, Krishnan S, Senthilkumar K, Sasirekha V. A comparative investigation on the scavenging of 2,2-diphenyl-1-picrylhydrazyl radical by the natural antioxidants (+) catechin and (-) epicatechin. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130805] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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15
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Senthilkumar K, Kanagathara N, Ragavendran V, Natarajan V, Marchewka M. Quantum chemical computational studies of 1,3-diammonium propylarsenate: a semi organic crystalline salt. INORG NANO-MET CHEM 2021. [DOI: 10.1080/24701556.2021.1963282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- K. Senthilkumar
- Department of Physics, Rajalakshmi Engineering College, Thandalam, Chennai, Tamil Nadu, India
| | - N. Kanagathara
- Department of Physics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Thandalam, Chennai, Tamil Nadu, India
| | - V. Ragavendran
- Department of Physics, Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya, Enathur, Kanchipuram, Tamil Nadu, India
| | - V. Natarajan
- Department of Physics, Rajalakshmi Institute of Technology, Kuthambakkam, Chennai, Tamil Nadu, India
| | - M.K. Marchewka
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland
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Pavithrakumar M, Krishnan S, Senthilkumar K. Charge Transport and Optical Absorption Properties of Dibenzocoronene Tetracarboxdiimide Based Liquid Crystalline Molecules: A Theoretical Study. J Phys Chem A 2021; 125:3852-3862. [PMID: 33938734 DOI: 10.1021/acs.jpca.1c00790] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Structure, optical absorption, and charge transport properties of dibenzocoronene tetracarboxdiimide (DCDI) based molecules were studied using electronic structure calculations. Based on the optimized neutral, cationic, and anionic geometries the ionized state properties, such as ionization potential, electron affinity, hole extraction potential, electron extraction potentials, and reorganization energy, were calculated. On the basis of the ground state geometry of the studied molecules, the absorption spectra were calculated using the time-dependent density functional theory (TDDFT) method at the PBE0/def-TZVP level of theory. It has been observed that the substitution of different functional groups significantly alters the absorption spectra of DCDI. The methoxy- (OCH3-) substituted DCDI molecule has a maximum absorption wavelength of 529 nm. The charge transport parameters, such as the charge transfer integral, spatial overlap integral, and the site energy, are calculated directly from the Kohn-Sham matrix elements. The reorganization energy for the presence of excess positive and negative charges and the charge transfer rate calculated from Marcus' theory were used to find the mobility of charge carriers. The computed results show that the mobility of charge carriers is strongly influenced by the functional groups present on the DCDI molecule. The effect of intermolecular structural fluctuations on charge transport properties was studied through molecular dynamics and Monte Carlo simulations based on the polaron hopping mechanism. The calculated charge carrier mobility shows that the cyano- (CN-) substituted DCDI molecules are having n-type semiconducting property while, methoxy- (OCH3-) and thiol- (SH-) substituted DCDI molecules exhibit ambipolar semiconducting properties.
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Affiliation(s)
- M Pavithrakumar
- Department of Physics, Bharathiar University, Coimbatore-641 046, India
| | - S Krishnan
- Department of Physics, Bharathiar University, Coimbatore-641 046, India
| | - K Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore-641 046, India
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17
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Shahroze RM, Chandrasekar M, Senthilkumar K, Senthil Muthu Kumar T, Ishak MR, Rajini N, Siengchin S, Ismail SO. Mechanical, Interfacial and Thermal Properties of Silica Aerogel-Infused Flax/Epoxy Composites. INT POLYM PROC 2021. [DOI: 10.1515/ipp-2020-3964] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The mechanical, interfacial and thermal properties of a flax/ epoxy composite incorporated with a silica aerogel (SA) at 0.5, 1.0 and 2.0 wt.% were examined in this work. A set of maximum enhancements of 8.7%, 9.0% and 24.0% in the impact, inter-laminar shear strength (ILSS) and compressive strengths were achieved by adding 0.5 wt.% SA into the flax/epoxy composites. Also, the results obtained from dynamic mechanical analysis (DMA) indicated that the damping characteristics, peak tan delta and peak loss modulus improved at all filler concentrations, while the glass transition temperature (Tg) decreased slightly. Features of SA such as biodegradability, ability to improve the mechanical properties as observed in this work and enhanced damping characteristics make them suitable for application in machine parts requiring impact resistance and vibration damping characteristics.
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Affiliation(s)
- R. M. Shahroze
- Department of Aerospace Engineering, Faculty of Engineering, University Putra Malaysia , Serdang , Selangor , Malaysia
| | - M. Chandrasekar
- School of Aeronautical Sciences, Hindustan Institute of Technology & Science, Padur, Kelambakkam , Chennai , Tamil Nadu , India
| | - K. Senthilkumar
- Department of Mechanical Engineering, Kalasalingam Academy of Research and Education , Krishnankoil , Tamil Nadu , India
- Department of Materials and Production Engineering, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok , Bangsue , Bangkok , Thailand
| | - T. Senthil Muthu Kumar
- Department of Mechanical Engineering, Kalasalingam Academy of Research and Education , Krishnankoil , Tamil Nadu , India
- Department of Materials and Production Engineering, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok , Bangsue , Bangkok , Thailand
| | - M. R. Ishak
- Department of Aerospace Engineering, Faculty of Engineering, University Putra Malaysia , Serdang , Selangor , Malaysia
- Aerospace Malaysia Research Centre (AMRC), Faculty of Engineering, Universiti Putra Malaysia , Serdang , Selangor , Malaysia
| | - N. Rajini
- Department of Mechanical Engineering, Kalasalingam Academy of Research and Education , Krishnankoil , Tamil Nadu , India
| | - Suchart Siengchin
- Department of Materials and Production Engineering, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok , Bangsue , Bangkok , Thailand
| | - S. O. Ismail
- Manufacturing, Materials, Biomedical and Civil Division, School of Engineering and Computer Science, University of Hertfordshire , Hatfield , Hertfordshire , UK
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Krishnan S, Senthilkumar K. The influence of the shape and configuration of sensitizer molecules on the efficiency of DSSCs: a theoretical insight. RSC Adv 2021; 11:5556-5567. [PMID: 35423080 PMCID: PMC8694715 DOI: 10.1039/d0ra10613e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 01/04/2021] [Indexed: 01/10/2023] Open
Abstract
The sensitizer is an active component of dye sensitized solar cell (DSSC) technology, which is highly influential for the performance of DSSCs. The present study attempts to investigate the relationship between the shape of the sensitizer molecule and efficiency of DSSCs. Specifically, 17 different structures were investigated, and classified into four categories based on the shape of the dye molecule, namely L-shaped (linear), V-shaped, X-shaped and Y-shaped, and into two different categories based on the donor moiety. The five of studied structures contained a triphenylamine (TPA) donor moiety, and twelve structures contained carbazole (CAR) donor moiety. Parameters related to the performance of DSSCs such as absorption spectra, intramolecular charge transfer indices, frontier molecular orbitals, light harvesting efficiency, excited-state lifetime, exciton binding energy, electrostatic potential, charge transfer and electron injection ability were studied using results obtained from electronic structure calculations. The analysis of these various parameters showed that the linear-shaped and V-shaped sensitizers possess better photon absorption ability, and the V-shaped structure is best suited shape for applications in high performance DSSCs. Numerous studies have reported that the shape of a sensitizer matters for DSSC performance, while the present study investigates why and how it matters.![]()
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Affiliation(s)
- S Krishnan
- Department of Physics, Bharathiar University Coimbatore 641046 India +91-422-2422387
| | - K Senthilkumar
- Department of Physics, Bharathiar University Coimbatore 641046 India +91-422-2422387
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Chandrasekar M, Venkatanarayanan P, Senthilkumar K, Kumar TSM, Siengchin S, Britto JJ. Computational modeling of biocomposites. Green Biocomposites for Biomedical Engineering 2021:19-34. [DOI: 10.1016/b978-0-12-821553-1.00012-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
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Sandhiya L, Senthilkumar K. Unimolecular decomposition of acetyl peroxy radical: a potential source of tropospheric ketene. Phys Chem Chem Phys 2020; 22:26819-26827. [PMID: 33231595 DOI: 10.1039/d0cp04590j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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 unimolecular decomposition of acetyl peroxy radicals followed by subsequent nitration is known to lead to the formation of peroxy acetyl nitrate (PAN) in the troposphere. Using high level quantum chemical calculations, we show that the acetyl peroxy radical is a precursor in the formation of tropospheric ketene. The results show that the presence of a single or double water molecule(s) as a catalyst does not influence the decomposition reaction directly to form ketene and hydroperoxy radicals. The electronic excitation of the reactive and product complexes occurs in the wavelength range of ∼1400 nm, suggesting that the complexes undergo photoexcitation in the near IR region. The results ascertain that the dissociation of acetyl peroxy radicals into ketene and hydroperoxy radicals occurs more likely through the excitation route and the corresponding excitation wavelength reveals that the reactions are red-light driven. Three different product complexes, ketene·HO2, ketene·H2O·HO2 and ketene·(H2O)2·HO2, are formed from the reaction. The direct dynamics simulations show that the product complexes are more stable and possess a long lifetime. The calculated temperature dependent equilibrium constant of the product complexes reveals that their atmospheric abundances decrease with increasing altitudes.
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Affiliation(s)
- L Sandhiya
- CSIR - National Institute of Science, Technology and Development Studies, New Delhi-110012, India.
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21
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Senthilkumar K, Kanagathara N, Natarajan V, Ragavendran V, Srinivasan T, Marchewka M. Single crystal X-ray diffraction, spectral characterization, evaluation of electronic and chemical reactivity of tert-butylammonium N-acetylglycinate monohydrate – A DFT study. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128764] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Anitha S, Krishnan S, Senthilkumar K, Sasirekha V. Theoretical investigation on the structure and antioxidant activity of (+) catechin and (−) epicatechin – a comparative study. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1745917] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- S. Anitha
- Department of Physics, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore, India
| | - S. Krishnan
- Department of Physics, Bharathiar University, Coimbatore, India
| | - K. Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore, India
| | - V. Sasirekha
- Department of Physics, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore, India
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Abstract
Study on the reactivity of HFC-C1436 with OH radical using electronic structure calculations.
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Affiliation(s)
- R. Bhuvaneswari
- Department of Physics
- Vellalar College For Women
- Erode
- India
- Department of Physics
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24
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Abstract
Effect of dynamics of site energy disorder on charge transport in organic molecular semiconductors is not yet well-established. In order to study the relationship between the dynamics of site energy disorder and charge transport, we have performed a multiscale study on dialkyl substituted thienothiophene capped benzobisthiazole (BDHTT-BBT) and methyl-substituted dicyanovinyl-capped quinquethiophene (DCV5T-Me) molecular solids. In this study, we explore the structural dynamics and correlated charge transport by electronic structure calculations, molecular dynamics, and kinetic Monte-Carlo simulations. We have also proposed the differential entropy dependent diffusion and charge density equations to study the electric field drifted diffusion property and carrier density. In this investigation, we have addressed the transformation mechanism from dynamic to static disorder in the extended stacked molecular units. Here, the decrease in the charge transfer rate due to site energy fluctuations reveals the dispersion transport along the extended π-stacked molecules. Furthermore, the calculated current density for a different set of site energy difference values shows the validity and the limitations of the Einstein relation. Based on the calculated ideality factor, we have classified the charge transport in these molecules as either the Langevin or the Shockley-Read-Hall type mechanism. Through the calculated mobility, current density, and ideality factor analysis, we categorize the applicability of molecules of interest for photovoltaic or light emitting diode applications.
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Affiliation(s)
- K Navamani
- Theoretical Sciences Unit, School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
| | - Swapan K Pati
- Theoretical Sciences Unit, School of Advanced Materials (SAMat), Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India
| | - K Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore 641046, India
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25
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Gnanaprakasam M, Saranya G, Bandaru S, English NJ, Senthilkumar K. Atmospheric oxidation mechanism and kinetics of 2-bromo-4,6-dinitroaniline by OH radicals - a theoretical study. Phys Chem Chem Phys 2019; 21:21109-21127. [PMID: 31528950 DOI: 10.1039/c9cp04271g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
2-Bromo-4,6-dinitroaniline (BNA) is identified as a domestic-dust pollutant in urban environments, with deleterious atmospheric effects. In the present work, we studied the reaction pathways and kinetics for BNA oxidation by the OH radical using quantum-chemical methods and canonical-variational transition-state theory with small-curvature tunneling correction (CVT/SCT). OH-radial-mediated BNA oxidation was studied by considering OH addition to carbon atoms (C1 to C6) of BNA and H-atom abstraction at the -NH2 group and carbon atoms (C3 and C5) of BNA by OH radicals. It is observed that an OH-addition reaction is energetically more favorable. In addition, the rate constant was calculated for the favorable initial OH-addition reactions over the temperature range of 278 to 1000 K. The subsequent reactions for the favorable BNA-OH adduct intermediate with O2, HO2 and NO radicals are studied. We have identified the following possible end products from this BNA-oxidation reaction: (i) 2-amino-3-bromo-6-hydroperoxy-5-methyl-1-nitro-cyclohexa-2,4 dienol, (ii) 2-amino-1-bromo-6-hydroperoxy-5-methyl-3-nitro-cyclohexa-2,4-dienol, (iii) 2-amino-1-bromo-6-hydroperoxy-5-methyl-3-nitro-cyclohexa-2,4-dienol, (iv) 3-amino-4-bromo-4-hydroperoxy-8-methyl-2-nitro-6,7-dioxa-bicyclo oct-2-en-8-ol, (v) 2-amino-1-bromo-6-hydroperoxy-5-methyl-3-nitro-cyclohexa-2,4-dienol, and (vi) 3-amino-2-bromo-8-methyl-4-nitro-6,7-dioxa-bicyclo oct-3-ene-2,8-diol.
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Affiliation(s)
- M Gnanaprakasam
- Department of Physics, Bharathiar University, Coimbatore-641 046, India.
| | - G Saranya
- Beijing Computational Science Research Center, Beijing, 100084, China
| | - S Bandaru
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
| | - N J English
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
| | - K Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore-641 046, India.
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Manonmani G, Sandhiya L, Senthilkumar K. Mechanism and Kinetics of Diuron Oxidation Initiated by Hydroxyl Radical: Hydrogen and Chlorine Atom Abstraction Reactions. J Phys Chem A 2019; 123:8954-8967. [DOI: 10.1021/acs.jpca.9b04800] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- G. Manonmani
- Department of Physics, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
| | - L. Sandhiya
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, United States
| | - K. Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
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Senthilkumar K, Maria Das KJ. Comparison of biological-based and dose volume-based intensity-modulated radiotherapy plans generated using the same treatment planning system. J Cancer Res Ther 2019; 15:S33-S38. [PMID: 30900617 DOI: 10.4103/jcrt.jcrt_956_16] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Purpose Nowadays, most of the radiotherapy (RT) treatment planning systems (TPSs) uses dose or dose-volume (DV)-based cost functions for Intensity modulated radiation therapy (IMRT) fluence optimization. Recently, some of the TPSs incorporated biological-based cost function for IMRT optimization. Most of the previous studies compared IMRT plans optimized using biological-based and DV-based cost functions in two different TPSs. Hence, the purpose of the study is to compare equivalent uniform dose (EUD)-based and DV-based IMRT plans generated using the same TPS. Materials and Methods Twenty patients with prostate cancer were retrospectively selected for this study. For each patient, two IMRT plans were generated using EUD-based cost function (EUD_TP) and DV-based cost (DV_Treatment Plan (TP)), respectively. The generated IMRT plans were evaluated using both physical and biological dose evaluation indices. Results Biological-based plans ended up with a highly inhomogeneous target dose when compared to DV-based plans. For serial organs, Dnear-max or D2%(Gy) of EUD-based plans showed significant difference with DV-based plans (P = 0.003). For both rectum and bladder, there was a significant difference in mean dose and D30%(Gy) dose between EUD-based plans and DV-based plans. Conclusion In this study, we decoupled the influence of optimization parameters from the potential use of EUD-based cost functions on plan quality by generating both plans in the same TPS.
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Affiliation(s)
- K Senthilkumar
- Department of Medical Physics, Karnataka Cancer Therapy and Research Institute, Hubli, Karnataka; Research and Development Centre, Bharathiar University, Coimbatore, Tamil Nadu, India
| | - K J Maria Das
- Research and Development Centre, Bharathiar University, Coimbatore, Tamil Nadu; Department of Radiotherapy, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
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Vinodha M, Senthilkumar K. Adsorption of tetracyanoquinodimethane and tetrathiafulvalene on aluminium (100) surface – a first principle study of structural and electronic properties. Molecular Simulation 2018. [DOI: 10.1080/08927022.2018.1557332] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- M. Vinodha
- Department of Physics, Bharathiar University, Coimbatore, India
| | - K. Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore, India
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Gnanaprakasam M, Sandhiya L, Senthilkumar K. Theoretical Investigation on the Mechanism and Kinetics of Atmospheric Reaction of Methyldichloroacetate with Hydroxyl Radical. J Phys Chem A 2018; 122:9316-9325. [PMID: 30351946 DOI: 10.1021/acs.jpca.8b05223] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The atmospheric reaction of methyldichloroacetate (MDCA) with OH radical is studied using electronic structure calculations. Five different pathways were considered for the initial reactions, which results in the formation of alkyl radical of MDCA along with H2O, HOCl, and CH3O•. Among the five pathways studied, the α-carbon atom (-CHCl2 site) H atom abstraction reaction, which leads to the formation of the alkyl radical intermediate •CCl2C(O)OCH3 (I1) is found to be more favorable with an energy barrier of 7.3 kcal/mol, and Cl-atom abstraction reaction is having high energy barrier of 21.3 kcal/mol at M06-2X/6-311++G(2df,2p) level. The calculated thermochemical parameters show that except Cl-atom abstraction channel the other initial reaction channels are highly exothermic. The rate constant is calculated for the initial H atom abstraction reactions using canonical variational transition state theory over the temperature range of 278 to 350 K. The Arrhenius plot shows positive temperature dependence for both the reactions. The results from the calculated thermochemical parameters and rate constants show that the formation of the alkyl radical intermediate (I1) is more favorable with the rate constant of 2.07 × 10-13 cm3 molecule-1 s-1 at 298 K. The calculated atmospheric lifetime of MDCA is 28 days at normal atmospheric OH concentration. The results obtained from secondary reactions show that the major product formed from the oxidation chemistry of MDCA is methyl-2-chloro-2-oxoacetate (or) methyl oxalyl chloride.
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Affiliation(s)
- M Gnanaprakasam
- Department of Physics , Bharathiar University , Coimbatore 641 046 , India
| | - L Sandhiya
- Department of Chemistry and Biochemistry , Texas Tech University , Lubbock , Texas 79409 , United States
| | - K Senthilkumar
- Department of Physics , Bharathiar University , Coimbatore 641 046 , India
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Ponnusamy S, Sandhiya L, Senthilkumar K. Atmospheric Oxidation Mechanism and Kinetics of Hydrofluoroethers, CH3OCF3, CH3OCHF2, and CHF2OCH2CF3, by OH Radical: A Theoretical Study. J Phys Chem A 2018; 122:4972-4982. [DOI: 10.1021/acs.jpca.8b01890] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S. Ponnusamy
- Department of Physics, Bharathiar University, Coimbatore 641 046, India
| | - L. Sandhiya
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, United States
| | - K. Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore 641 046, India
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31
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Ponnusamy S, Sandhiya L, Senthilkumar K. Reaction mechanism and kinetics of the degradation of terbacil initiated by OH radical – A theoretical study. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2017.12.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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32
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Vinodha M, Senthilkumar K. Counter anion effect on structural, opto-electronic and charge transport properties of fused π-conjugated imidazolium compound. Mol Phys 2017. [DOI: 10.1080/00268976.2017.1414965] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- M. Vinodha
- Department of Physics, Bharathiar University, Coimbatore, India
| | - K. Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore, India
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Roy P, Jaisree S, Balakrishnan S, Senthilkumar K, Mahaprabhu R, Mishra A, Maity B, Ghosh TK, Karmakar AP. Molecular epidemiology of goat pox viruses. Transbound Emerg Dis 2017; 65:32-36. [PMID: 29150913 DOI: 10.1111/tbed.12763] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [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: 08/30/2017] [Indexed: 11/27/2022]
Abstract
Goat pox disease outbreaks were observed in different places affecting Black Bengal Goats in West Bengal (WB) and Tellicherry, Vembur and non-descriptive breeds in Tamil Nadu (TN) causing severe lesions and mortality up to 30%. Clinical specimens from all the outbreaks were screened by polymerase chain reaction followed by restriction fragment length polymorphism (PCR-RFLP) and confirmed the diseases as Goat Pox. Virus isolation in Vero cell line was done with randomly selected ten samples, cytopathic effects (CPE) characterized by syncytia and intracytoplasmic inclusion bodies were observed after several blind passages. Nucleotide sequence of complete p32 gene using randomly selected two isolates and three clinical specimens revealed presence of Goat pox virus (GTPV)-specific signature residues in all the sequences. Phylogenetic analysis using the present five sequences along with GenBank data of GTPV complete p32 gene sequences showed all the GTPV sequences cluster together except Pellor strain (NC004003) and FZ Chinese strain (KC951854). The five sequences either from WB or TN cluster more closely with GTPV isolates of Maharashtra state that were responsible for cross species outbreak of pox disease in both sheep (KF468759) and goats (KF468762) in India during the year 2010. All the Indian goat pox viruses, including the Mukteswar strain, isolated in 1946 and sequence reported in 2004 clustered together with the GTPVs causing the recent outbreaks. It was observed that GTPVs caused similar clinical manifestation irrespective of their geographical locations and breed characteristics, no variation observed among the Indian isolates based on p32 gene over the period of seventy years and disease outbreaks could not be observed or reported in vaccinated goats.
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Affiliation(s)
- P Roy
- Central University Laboratory, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, India
| | - S Jaisree
- Central University Laboratory, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, India
| | - S Balakrishnan
- Central University Laboratory, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, India
| | - K Senthilkumar
- Central University Laboratory, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, India
| | - R Mahaprabhu
- Central University Laboratory, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, India
| | - A Mishra
- Central University Laboratory, Centre for Animal Health Studies, Tamil Nadu Veterinary and Animal Sciences University, Chennai, India
| | - B Maity
- Animal Resource Department, Regional Laboratory, Burdwan, India
| | - T K Ghosh
- Animal Resource Department, Regional Laboratory, Burdwan, India
| | - A P Karmakar
- Animal Resource Department, Veterinary Pathological Laboratory, Bishnupur, India
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Gnanaprakasam M, Sandhiya L, Senthilkumar K. A theoretical investigation on the mechanism and kinetics of the gas-phase reaction of naphthalene with OH radical. Theor Chem Acc 2017. [DOI: 10.1007/s00214-017-2162-3] [Citation(s) in RCA: 5] [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: 11/29/2022]
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Bhuvaneswari R, Sandhiya L, Senthilkumar K. Theoretical Investigations on the Mechanism and Kinetics of OH Radical Initiated Reactions of Monochloroacetic Acid. J Phys Chem A 2017; 121:6028-6035. [PMID: 28719205 DOI: 10.1021/acs.jpca.7b03760] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The oxidation mechanism of monochloroacetic acid (CH2ClCOOH) by OH radical has been systematically investigated employing quantum mechanical methods coupled with kinetic calculation using canonical variational transition state theory. Three distinct transition states were identified for the titled reaction, two corresponding to the hydrogen atom abstraction and one corresponding to the chlorine atom abstraction. The rate constants of the titled reactions are computed over the temperature range 278-350 K, and the branching ratios calculated for the hydrogen atom abstraction from the -C(O)OH site and the -CH2Cl site are 25 and 75%, respectively, at 298 K. The computed branching ratio indicates that the kinetically favorable reaction is the hydrogen atom abstraction from the -CH2Cl site resulting in the formation of CHClC(O)OH radical, which further undergoes secondary reaction with O2 and other atmospheric species. The calculated overall rate constant for the hydrogen atom abstraction reactions is in consistent with the reported experimental rate constant. The atmospheric lifetime of CH2ClCOOH is found to be around 18 days.
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Affiliation(s)
- R Bhuvaneswari
- Department of Physics, Bharathiar University, Coimbatore - 641 046, Tamil Nadu, India
| | - L Sandhiya
- Department of Physics, Bharathiar University, Coimbatore - 641 046, Tamil Nadu, India
| | - K Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore - 641 046, Tamil Nadu, India
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Ponnusamy S, Sandhiya L, Senthilkumar K. Mechanism and Kinetics of the Reaction of Nitrosamines with OH Radical: A Theoretical Study. INT J CHEM KINET 2017. [DOI: 10.1002/kin.21079] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- S. Ponnusamy
- Department of Physics; Bharathiar University; Coimbatore 641 046 India
| | - L. Sandhiya
- Department of Physics; Bharathiar University; Coimbatore 641 046 India
| | - K. Senthilkumar
- Department of Physics; Bharathiar University; Coimbatore 641 046 India
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Abstract
Social grooming is conspicuous in group-living mammals. Bats are gregarious and may groom each other, but the motivation for such social behaviour remains unclear. Here, we describe patterns and infer function of social grooming in tent-making Indian short-nosed fruit bats. Combining field and captivity observations, we found that males and their harem of females mutually groom and apply bodily secretions to one another in tight clusters. Mutual grooming is more commonly initiated by females, before emergence flight at dusk, and during the non-mating season. The within-harem association pattern suggests males may recognize female reproductive status via social grooming. Chemical analysis of the secretions applied during grooming revealed volatile organic compounds that may be involved in chemosensory-mediated communication and/or mate choice. These fruit bat harems were previously seen as simple aggregations, with limited interactions among individuals. Our findings suggest social grooming is multi-functional, with potential implications for the bats’ social lives.
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Affiliation(s)
- A. Rathinakumar
- Department of Animal Behaviour & Physiology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625021, India
| | - Mauricio Cantor
- Department of Biology, Dalhousie University, Halifax, NS, Canada B3H 4J1
| | - K. Senthilkumar
- Department of Animal Behaviour & Physiology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625021, India
| | - P. Vimal
- Department of Animal Behaviour & Physiology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625021, India
| | - P. Kaliraj
- Department of Animal Behaviour & Physiology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625021, India
| | - G. Marimuthu
- Department of Animal Behaviour & Physiology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625021, India
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Ponnusamy S, Sandhiya L, Senthilkumar K. The atmospheric oxidation mechanism and kinetics of 1,3,5-trimethylbenzene initiated by OH radicals – a theoretical study. NEW J CHEM 2017. [DOI: 10.1039/c7nj01285c] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The atmospheric fate of 1,3,5-trimethylbenzene is determined by OH-radical addition, and subsequent bicyclic peroxy radical ring closure and ring breaking pathways.
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Affiliation(s)
- S. Ponnusamy
- Department of Physics
- Bharathiar University
- Coimbatore
- India
| | - L. Sandhiya
- Department of Physics
- Bharathiar University
- Coimbatore
- India
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Prabhakaran R, Kalaivani P, Senthilkumar K, Natarajan K. Synthesis, structural characterization, DNA/protein binding and in vitro cytotoxicity of three structurally different organoruthenium metallates from single pot. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.10.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Senthilkumar K, Mathialagan P, Manivannan C, Jayathangaraj MG, Gomathinayagam S. A study on the tolerance level of farmers toward human-wildlife conflict in the forest buffer zones of Tamil Nadu. Vet World 2016; 9:747-52. [PMID: 27536037 PMCID: PMC4983127 DOI: 10.14202/vetworld.2016.747-752] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [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: 02/18/2016] [Accepted: 06/11/2016] [Indexed: 11/20/2022] Open
Abstract
Aim: The aim of this work was to study the tolerance level of farmers toward different human-wildlife conflict (HWC) situations. Materials and Methods: This study was conducted in 24 villages of nine blocks from Kancheepuram, Coimbatore, Erode, and Krishnagiri districts of Tamil Nadu by personally interviewing 240 farmers affected with four different HWC situations such as human-elephant conflict (HEC), human-wild pig conflict (HPC), human-gaur conflict (HGC), and human-monkey conflict (HMC). A scale developed for this purpose was used to find out the tolerance level of the farmers. Results: In general, the majority (61.70%) of the farmers had medium level of tolerance toward HWC, whereas 25.40% and 12.90% belonged to a high and low category, respectively. The mean tolerance level of the farmer’s encountering HMC is low (8.77) among the other three wild animal conflicts. In tackling HWC, the majority (55.00%) of the HEC farmers drove the elephant once it entered into their farmland. In the HPC, more than three-fourths of the respondents drove away the wild pig once they were found in farmlands. With regard to the HMC, a less number of them (1.70%) drove the monkey away if monkeys were spotted in their village. With regard to HGC, 95.00% of the respondents frightened the gaurs if their family members were threatened by gaurs. Conclusion: The present study suggests that that majority of the farmers had medium level of tolerance toward HWC. The tolerance level of the HMC farmers was lower than other three HWC affected farmers. This study emphasizes the need for necessary training to tackle the problem in an effective manner for wild animal conservation.
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Affiliation(s)
- K Senthilkumar
- Department of Wildlife Science, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu, India
| | - P Mathialagan
- Department of Veterinary and Animal Husbandry Extension, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu, India
| | - C Manivannan
- University Publication Division, Directorate of Distance Education, Tamil Nadu Veterinary and Animal Sciences University, Madhavaram Milk Colony, Chennai, Tamil Nadu, India
| | - M G Jayathangaraj
- Department of Wildlife Science, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu, India
| | - S Gomathinayagam
- Department of Veterinary Parasitology, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai, Tamil Nadu, India
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Senthilkumar K, Maria Das KJ, Balasubramanian K, Deka AC, Patil BR. Estimation of the effects of normal tissue sparing using equivalent uniform dose-based optimization. J Med Phys 2016; 41:123-8. [PMID: 27217624 PMCID: PMC4871001 DOI: 10.4103/0971-6203.181631] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
In this study, we intend to estimate the effects of normal tissue sparing between intensity modulated radiotherapy (IMRT) treatment plans generated with and without a dose volume (DV)-based physical cost function using equivalent uniform dose (EUD). Twenty prostate cancer patients were retrospectively selected for this study. For each patient, two IMRT plans were generated (i) EUD-based optimization with a DV-based physical cost function to control inhomogeneity (EUDWith DV) and (ii) EUD-based optimization without a DV-based physical cost function to allow inhomogeneity (EUDWithout DV). The generated plans were prescribed a dose of 72 Gy in 36 fractions to planning target volume (PTV). Mean dose, D30%, and D5% were evaluated for all organ at risk (OAR). Normal tissue complication probability was also calculated for all OARs using BioSuite software. The average volume of PTV for all patients was 103.02 ± 27 cm3. The PTV mean dose for EUDWith DV plans was 73.67 ± 1.7 Gy, whereas for EUDWithout DV plans was 80.42 ± 2.7 Gy. It was found that PTV volume receiving dose more than 115% of prescription dose was negligible in EUDWith DV plans, whereas it was 28% in EUDWithout DV plans. In almost all dosimetric parameters evaluated, dose to OARs in EUDWith DV plans was higher than in EUDWithout DV plans. Allowing inhomogeneous dose (EUDWithout DV) inside the target would achieve better normal tissue sparing compared to homogenous dose distribution (EUDWith DV). Hence, this inhomogeneous dose could be intentionally dumped on the high-risk volume to achieve high local control. Therefore, it was concluded that EUD optimized plans offer added advantage of less OAR dose as well as selectively boosting dose to gross tumor volume.
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Affiliation(s)
- K Senthilkumar
- Department of Medical Physics, Karnataka Cancer Therapy and Research Institute, Hubli, Karnataka, India; Research and Development Centre, Bharathiar University, Coimbatore, Tamil Nadu, India
| | - K J Maria Das
- Department of Radiotherapy, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - K Balasubramanian
- Department of Medical Physics, Karnataka Cancer Therapy and Research Institute, Hubli, Karnataka, India
| | - A C Deka
- Department of Medical Physics, Karnataka Cancer Therapy and Research Institute, Hubli, Karnataka, India
| | - B R Patil
- Department of Medical Physics, Karnataka Cancer Therapy and Research Institute, Hubli, Karnataka, India
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Sandhiya L, Ponnusamy S, Senthilkumar K. Atmospheric oxidation mechanism of OH-initiated reactions of diethyl ether – the fate of the 1-ethoxy ethoxy radical. RSC Adv 2016. [DOI: 10.1039/c6ra14801h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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] Open
Abstract
The 1-ethoxy ethoxy radical resulting from the secondary peroxy chemistry in the oxidation of diethyl ether (DEE) by hydroxyl radical leads to the formation of ethyl formate in major quantities and ethyl acetate in minor quantities.
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Affiliation(s)
- L. Sandhiya
- Department of Physics
- Bharathiar University
- Coimbatore – 641 046
- India
| | - S. Ponnusamy
- Department of Physics
- Bharathiar University
- Coimbatore – 641 046
- India
| | - K. Senthilkumar
- Department of Physics
- Bharathiar University
- Coimbatore – 641 046
- India
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Navamani K, Senthilkumar K. Forth-back oscillated charge carrier motion in dynamically disordered hexathienocoronene molecules: a theoretical study. Phys Chem Chem Phys 2015; 17:17729-38. [PMID: 26080732 DOI: 10.1039/c5cp02189h] [Citation(s) in RCA: 8] [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] [Indexed: 01/21/2023]
Abstract
Electronic structure calculations were performed to investigate the charge transport properties of hexathienocoronene (HTC) based molecules. The effective displacement of the charge carrier along the π-orbital of nearby molecules is calculated by monitoring the forth and back oscillations of the charge carrier through kinetic Monte Carlo simulation. The charge transport parameters such as charge transfer rate, mobility, hopping conductivity, localized charge density, time average effective mass and degeneracy pressure are calculated and used to study the charge transport mechanism in the studied molecules. The existence of degeneracy levels facilitates the charge transfer and is analyzed through degeneracy pressure. Theoretical results show that the site energy difference in the dynamically disordered system controls the forth-back oscillation of charge carrier and facilitates the unidirectional charge transport mechanism along the sequential localized sites. The ethyl substituted HTC has good hole and electron hopping conductivity of 415 and 894 S cm(-1), respectively, whereas unsubstituted HTC has the small hole mobility of 0.06 cm(2) V(-1) s(-1) which is due to large average effective mass of 1.42 × 10(-28) kg.
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Affiliation(s)
- K Navamani
- Department of Physics, Bharathiar University, Coimbatore-641 046, India.
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Sethu Raman M, Kesavan M, Senthilkumar K, Ponnuswamy V. Ultrasonic, DFT and FT-IR studies on hydrogen bonding interactions in aqueous solutions of diethylene glycol. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2014.12.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Abstract
Electronic structure calculations were used to study the charge transport and optical properties of 2,2′,6,6′-tetraphenyldipyranylidene (Ph4DP) and its sulfur analogue 2,2′,6,6′-tetraphenyldithiopyranylidene (Ph4DTP) based molecules.
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Affiliation(s)
- K. Navamani
- Department of Physics
- Bharathiar University
- Coimbatore-641 046
- India
| | - K. Senthilkumar
- Department of Physics
- Bharathiar University
- Coimbatore-641 046
- India
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Bag SS, Jana S, Yashmeen A, Senthilkumar K, Bag R. Triazolyl-donor-acceptor chromophore-decorated unnatural amino acids and peptides: FRET events in a β-turn conformation. Chem Commun (Camb) 2014; 50:433-5. [PMID: 24253679 DOI: 10.1039/c3cc47488g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The β-turn conformation and FRET process were established in the designed tripeptide containing fluorescent triazolyl donor and acceptor-decorated unnatural amino acids separated by a natural alanine.
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Affiliation(s)
- Subhendu Sekhar Bag
- Bio-organic Chemistry Laboratory, Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India.
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Sandhiya L, Kolandaivel P, Senthilkumar K. Oxidation and nitration of tyrosine by ozone and nitrogen dioxide: reaction mechanisms and biological and atmospheric implications. J Phys Chem B 2014; 118:3479-90. [PMID: 24611937 DOI: 10.1021/jp4106037] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The nitration of tyrosine by atmospheric oxidants, O3 and NO2, is an important cause for the spread of allergenic diseases. In the present study, the mechanism and pathways for the reaction of tyrosine with the atmospheric oxidants O3 and NO2 are studied using DFT-M06-2X, B3LYP, and B3LYP-D methods with the 6-311+G(d,p) basis set. The energy barrier for the initial oxidation reactions is also calculated at the CCSD(T)/6-31+G(d,p) level of theory. The reaction is studied in gas, aqueous, and lipid media. The initial oxidation of tyrosine by O3 proceeds by H atom abstraction and addition reactions and leads to the formation of six different intermediates. The subsequent nitration reaction is studied for all the intermediates, and the results show that the nitration affects both the side chain and the aromatic ring of tyrosine. The rate constant of the favorable oxidation and nitration reaction is calculated using variational transition state theory over the temperature range of 278-350 K. The spectral properties of the oxidation and nitration products are calculated at the TD-M06-2X/6-311+G(d,p) level of theory. The fate of the tyrosine radical intermediate is studied by its reaction with glutathione antioxidant. This study provides an enhanced understanding of the oxidation and nitration of tyrosine by O3 and NO2 in the context of improving the air quality and reducing the allergic diseases.
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Affiliation(s)
- L Sandhiya
- Department of Physics, Bharathiar University , Coimbatore 641 046, India
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