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Kulkarni PS, Potey AV, Bharati S, Kunhihitlu A, Narasimha B, Yallapa S, Dharmadhikari A, Gavade V, Kamat CD, Mallya A, Sarma AD, Goel S, Pisal SS, Poonawalla CS, Venkatesan R, Jones E, Flaxman A, Kim YC, Pollard AJ. The safety and immunogenicity of a bivalent conjugate vaccine against Salmonella enterica Typhi and Paratyphi A in healthy Indian adults: a phase 1, randomised, active-controlled, double-blind trial. Lancet 2024; 403:1554-1562. [PMID: 38555928 DOI: 10.1016/s0140-6736(24)00249-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 01/12/2024] [Accepted: 02/06/2024] [Indexed: 04/02/2024]
Abstract
BACKGROUND Enteric fever caused by Salmonella enterica Typhi and Salmonella Paratyphi A is an important public health problem, especially in low-income and middle-income countries with limited access to safe water and sanitation. We present results from, to our knowledge, the first ever human study of a bivalent paratyphoid A-typhoid conjugate vaccine (Sii-PTCV). METHODS In this double-blind phase 1 study, 60 healthy Indian adults were randomly assigned (1:1) to receive a single intramuscular dose of either Sii-PTCV or typhoid conjugate vaccine (Typbar-TCV). Safety was assessed by observing solicited adverse events for 1 week, unsolicited events for 1 month, and serious adverse events (SAEs) over 6 months. Immunogenicity at 1 month and 6 months was assessed by measuring anti-capsular polysaccharide antigen Vi (anti-Vi) IgG and IgA against Salmonella Typhi and anti-lipopolysaccharide (LPS) IgG against Salmonella Paratyphi A by ELISA, and functional antibodies using serum bactericidal assay (SBA) against Salmonella Paratyphi A. This study is registered with Clinical Trial Registry-India (CTRI/2022/06/043608) and is completed. FINDINGS 60 participants were enrolled. Of these 60 participants, 57 (95%) participants were male and three (5%) participants were female. Solicited adverse events were observed in 27 (90%) of 30 participants who received Sii-PTCV and 26 (87%) of 30 participants who received Typbar-TCV. The most common local solicited event was pain in 27 (90%) participants who received Sii-PTCV and in 23 (77%) participants who received Typbar-TCV. The most common solicited systemic event was myalgia in five (17%) participants who received Sii-PTCV, whereas four (13%) participants who received Typbar-TCV had myalgia and four (13%) had headache. No vaccine-related unsolicited adverse events or SAEs were reported. The seroconversion rates on day 29 were 96·7% (95% CI 82·8-99·9) with Sii-PTCV and 100·0% (88·4-100·0) with Typbar-TCV for anti-Vi IgG; 93·3% (77·9-99·2) with Sii-PTCV and 100·0% (88·4-100·0) with Typbar-TCV for anti-Vi IgA; 100·0% (88·4-100·0) with Sii-PTCV and 3·3% (0·1-17·2) with Typbar-TCV for anti-LPS (paratyphoid); and 93·3% (77·9-99·2) with Sii-PTCV and 0% (0·0-11·6) with Typbar-TCV for SBA titres (paratyphoid). Paratyphoid anti-LPS immune responses were sustained at day 181. INTERPRETATION Sii-PTCV was safe and immunogenic for both typhoid and paratyphoid antigens indicating its potential for providing comprehensive protection against enteric fever. FUNDING Serum Institute of India.
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Sah-Teli SK, Pinkas M, Hynönen MJ, Butcher SJ, Wierenga RK, Novacek J, Venkatesan R. Structural basis for different membrane-binding properties of E. coli anaerobic and human mitochondrial β-oxidation trifunctional enzymes. Structure 2023; 31:812-825.e6. [PMID: 37192613 DOI: 10.1016/j.str.2023.04.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 04/04/2023] [Accepted: 04/20/2023] [Indexed: 05/18/2023]
Abstract
Facultative anaerobic bacteria such as Escherichia coli have two α2β2 heterotetrameric trifunctional enzymes (TFE), catalyzing the last three steps of the β-oxidation cycle: soluble aerobic TFE (EcTFE) and membrane-associated anaerobic TFE (anEcTFE), closely related to the human mitochondrial TFE (HsTFE). The cryo-EM structure of anEcTFE and crystal structures of anEcTFE-α show that the overall assembly of anEcTFE and HsTFE is similar. However, their membrane-binding properties differ considerably. The shorter A5-H7 and H8 regions of anEcTFE-α result in weaker α-β as well as α-membrane interactions, respectively. The protruding H-H region of anEcTFE-β is therefore more critical for membrane-association. Mutational studies also show that this region is important for the stability of the anEcTFE-β dimer and anEcTFE heterotetramer. The fatty acyl tail binding tunnel of the anEcTFE-α hydratase domain, as in HsTFE-α, is wider than in EcTFE-α, accommodating longer fatty acyl tails, in good agreement with their respective substrate specificities.
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Affiliation(s)
- Shiv K Sah-Teli
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland
| | - Matyas Pinkas
- CEITEC Masaryk University, Kamenice 5, 62500 Brno, Czech Republic
| | - Mikko J Hynönen
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland
| | - Sarah J Butcher
- Molecular & Integrative Biosciences Research Programme, Faculty of Biological and Environmental Sciences & Helsinki Institute of Life Science-Institute of Biotechnology, University of Helsinki, 00790 Helsinki, Finland
| | - Rik K Wierenga
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland
| | - Jiri Novacek
- CEITEC Masaryk University, Kamenice 5, 62500 Brno, Czech Republic
| | - Rajaram Venkatesan
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland.
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Janakiram R, Keerthivasan R, Janani R, Ramasundaram S, Martin MV, Venkatesan R, Ramana Murthy MV, Sudhakar T. Seasonal distribution of microplastics in surface waters of the Northern Indian Ocean. Mar Pollut Bull 2023; 190:114838. [PMID: 37002963 DOI: 10.1016/j.marpolbul.2023.114838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 03/11/2023] [Accepted: 03/13/2023] [Indexed: 06/19/2023]
Abstract
Seven expeditions were carried out during pre-monsoon, monsoon and post monsoon in 2018-2019 for marine plastic collection in surface waters of Northern Indian Ocean. PE and PP (83 %) is the dominant type of polymer found in the surface waters. Colored particles account for 67 % of all particles, with fibre/line accounting for 86 %. The average (Mean ± SD) microplastics concentration in the Northern Indian Ocean during pre-monsoon is 15,200 ± 7999 no./km2, Monsoon is 18,223 ± 14,725 no./km2 and post monsoon is 72,381 ± 77,692 no./km2. BoB during pre-monsoon and post monsoon the microplastic concentration remains same except in the northern BoB this change is caused due to weak winds. Microplastics concentration varied both spatially, temporal and heterogeneity in nature. These differences are caused by effect of wind and seasonal reversal of currents. Microplastics collected in the anticyclonic eddy are 129,000 no./km2.
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Affiliation(s)
- R Janakiram
- National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai, India.
| | - R Keerthivasan
- National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai, India.
| | - R Janani
- National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai, India.
| | - S Ramasundaram
- National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai, India.
| | - M V Martin
- National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai, India.
| | - R Venkatesan
- National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai, India.
| | - M V Ramana Murthy
- National Centre for Coastal Research, Ministry of Earth Sciences, Chennai, India.
| | - Tata Sudhakar
- National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai, India.
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Harijan RK, Dalwani S, Kiema TR, Venkatesan R, Wierenga RK. Thiolase: A Versatile Biocatalyst Employing CoA-Thioester Chemistry for Making and Breaking C-C Bonds. Annu Rev Biochem 2023. [PMID: 37068769 DOI: 10.1146/annurev-biochem-052521-033746] [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: 04/19/2023]
Abstract
Thiolases are CoA-dependent enzymes that catalyze the thiolytic cleavage of 3-ketoacyl-CoA, as well as its reverse reaction, which is the thioester-dependent Claisen condensation reaction. Thiolases are dimers or tetramers (dimers of dimers). All thiolases have two reactive cysteines: (a) a nucleophilic cysteine, which forms a covalent intermediate, and (b) an acid/base cysteine. The best characterized thiolase is the Zoogloea ramigera thiolase, which is a bacterial biosynthetic thiolase belonging to the CT-thiolase subfamily. The thiolase active site is also characterized by two oxyanion holes, two active site waters, and four catalytic loops with characteristic amino acid sequence fingerprints. Three thiolase subfamilies can be identified, each characterized by a unique sequence fingerprint for one of their catalytic loops, which causes unique active site properties. Recent insights concerning the thiolase reaction mechanism, as obtained from recent structural studies, as well as from classical and recent enzymological studies, are addressed, and open questions are discussed. Expected final online publication date for the Annual Review of Biochemistry, Volume 92 is June 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Rajesh K Harijan
- Department of Biochemistry, Albert Einstein College of Medicine, New York, USA
| | - Subhadra Dalwani
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland;
| | - Tiila-Riikka Kiema
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland;
- Biocenter Oulu, University of Oulu, Oulu, Finland
| | - Rajaram Venkatesan
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland;
| | - Rik K Wierenga
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland;
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Jayanthi E, Ramesh T, Kharat RS, Veeramanickam MRM, Bharathiraja N, Venkatesan R, Marappan R. Cybersecurity enhancement to detect credit card frauds in health care using new machine learning strategies. Soft comput 2023. [DOI: 10.1007/s00500-023-07954-y] [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: 03/03/2023]
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Lee CEC, Subramani P, Ananth P, Bhalraam U, Victor C, Venkatesan R, Prathiba V, Anjana RM, Palmer CNA, Struthers AD, Singh JS, Mordi IR, Mohan V, Lang CC. High prevalence of asymptomatic left ventricular diastolic dysfunction and its detection among South Asian patients with Type 2 Diabetes Mellitus compared with White Europeans. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.821] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Heart failure (HF) is an important manifestation of Type 2 Diabetes (T2D). The development of HF in T2D may be preceded by Stage B HF. Asymptomatic left ventricular impairment, especially left ventricular diastolic dysfunction (LVDD), is a defining early feature of Stage B HF. Detection of Stage B HF is crucial as it provides an opportune target for intervention with cardio-protective therapy to prevent the development of symptomatic HF in T2D. The risk of T2DM is higher in South Asian populations resulting in increased risk of macrovascular and microvascular complications. The prevalence of Stage B HF in South Asian patients with T2DM is not known.
Purpose
(i) To compare the prevalence of Stage B HF in South Asians in India compared with White Europeans in Scotland; (ii) To test the role of NT-proBNP in identifying Stage B HF
Methods
This study involved the comparison between two independently conducted, cross-sectional studies. The patients were asymptomatic patients with T2DM with no prior history of cardiovascular disease from Chennai, India (n=246) and Tayside, Scotland (n=246). All patients underwent transthoracic echocardiogram (echo) examination to detect the presence of structural and functional echo features of Stage B HF: left atrial enlargement (LAE), left ventricular hypertrophy (LVH), LVDD and LV systolic dysfunction (LVSD). Receiver operating curves (ROC) were used to determine the predictive ability of NT-proBNP to predict LAE/LVDD/LVD/LVSD.
Results
The prevalence of Stage B HF was high in South-Asian patients with T2DM (median age of 55 [49, 62] with a high prevalence of LVDD (5% had LVH, 7.3% had LAE, 70% had LVDD and 0% had LVSD (Figure 1B). 10% of the South Asian patients had at least 2 factors contributing to Stage B HF and these patients had higher NT-proBNP titres (703.4 [500.0, 949.2] vs 423.7 [35.0, 754.2], p<0.001). ROC curves show that NT-proBNP can predict these participants with 2 or more echo features [Figure 2B, AUC: 0.7043 (0.6159, 0.7928) p<0.05]. The prevalence of Stage B HF among White Europeans (median age of 67 [61, 72].) was lower compared with South Asian patients: 15% had LVH, 13% had LAE, 19% had LVDD and 2% had LVSD (Figure 1A). 8% of White Europeans had at least 2 factors contributing to Stage B HF and these had higher NT-proBNP titres (368.9 [154.6, 1087.8] vs 186.8 [79.7, 411.5], p=0.02). ROC curves show that NT-proBNP can predict participants with 2 or more factors [Figure 2A, AUC: 0.6399 (0.5122, 0.7676) p<0.05].
Conclusion
Our study has shown that South Asian patients with T2DM have a high prevalence of Stage B HF compared with White Europeans and that the predominant Stage B HF feature is LVDD.
We also found that NTproBNP could potentially be used to detect Stage B HF and help identify at-risk patients for cardio-protective therapy such as SGLT2 inhibitor therapy that has been shown to prevent the development of future HF events.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- C E C Lee
- University of Dundee, Division of Molecular and Clinical Medicine , Dundee , United Kingdom
| | - P Subramani
- Madras Diabetes Research Foundation , Chennai , India
| | - P Ananth
- Madras Diabetes Research Foundation , Chennai , India
| | - U Bhalraam
- University of Dundee, Division of Molecular and Clinical Medicine , Dundee , United Kingdom
| | - C Victor
- University of Dundee, Division of Molecular and Clinical Medicine , Dundee , United Kingdom
| | - R Venkatesan
- Madras Diabetes Research Foundation , Chennai , India
| | - V Prathiba
- Madras Diabetes Research Foundation , Chennai , India
| | - R M Anjana
- Madras Diabetes Research Foundation , Chennai , India
| | - C N A Palmer
- University of Dundee, Division of Molecular and Clinical Medicine , Dundee , United Kingdom
| | - A D Struthers
- University of Dundee, Division of Molecular and Clinical Medicine , Dundee , United Kingdom
| | - J S Singh
- University of Dundee, Division of Molecular and Clinical Medicine , Dundee , United Kingdom
| | - I R Mordi
- University of Dundee, Division of Molecular and Clinical Medicine , Dundee , United Kingdom
| | - V Mohan
- Madras Diabetes Research Foundation , Chennai , India
| | - C C Lang
- University of Dundee, Division of Molecular and Clinical Medicine , Dundee , United Kingdom
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Martin MV, Venkatesan R, Weller RA, Tandon A, Joseph KJ. Seasonal temperature variability observed at abyssal depths in the Arabian Sea. Sci Rep 2022; 12:15820. [PMID: 36138040 PMCID: PMC9500021 DOI: 10.1038/s41598-022-19869-z] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Accepted: 09/06/2022] [Indexed: 11/25/2022] Open
Abstract
The abyssal ocean is generally considered an aseasonal environment decoupled from the variabilities observed at and just below the ocean's surface. Herein, we describe the first in-situ timeseries record of seasonal warming and cooling in the Arabian Sea at a depth of 4000 m. The seasonal cycle was observed over the nearly four-year-long record (from November 2018 to March 2022). The abyssal seasonal temperature cycle also exhibited noticeable interannual variability. We investigate whether or not surface processes influence the near-seabed temperature through deep meridional overturning circulation modulated by the Indian monsoon or by Rossby wave propagation. We also consider if bottom water circulation variability and discharge of the dense Persian Gulf and Red Sea Water may contribute to the observed seasonality.
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Affiliation(s)
- M V Martin
- National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai, India.
| | - R Venkatesan
- National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai, India.,University of Massachusetts Dartmouth, North Dartmouth, MA, USA
| | | | - Amit Tandon
- University of Massachusetts Dartmouth, North Dartmouth, MA, USA
| | - K Jossia Joseph
- National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai, India
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Muruganandam N, Venkatraman V, Venkatesan R. Multivariate weighted isotonic regressive modest adaptive boosting-based resource-aware routing in WSN. Soft comput 2022. [DOI: 10.1007/s00500-022-07016-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Joshi S, Jakathamani S, Panda M, Annalakshmi O, Mathiyarasu R, Venkata Srinivas C, Venkatesan R, Venkatraman B. A systematic quartz extraction method for retrospective dosimetry and dating. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106555] [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: 10/21/2022]
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10
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Asthana P, Singh D, Pedersen JS, Hynönen MJ, Sulu R, Murthy AV, Laitaoja M, Jänis J, Riley LW, Venkatesan R. Structural insights into the substrate-binding proteins Mce1A and Mce4A from Mycobacterium tuberculosis. IUCrJ 2021; 8:757-774. [PMID: 34584737 PMCID: PMC8420772 DOI: 10.1107/s2052252521006199] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 06/15/2021] [Indexed: 05/28/2023]
Abstract
Mycobacterium tuberculosis (Mtb), which is responsible for more than a million deaths annually, uses lipids as the source of carbon and energy for its survival in the latent phase of infection. Mtb cannot synthesize all of the lipid molecules required for its growth and pathogenicity. Therefore, it relies on transporters such as the mammalian cell entry (Mce) complexes to import lipids from the host across the cell wall. Despite their importance for the survival and pathogenicity of Mtb, information on the structural properties of these proteins is not yet available. Each of the four Mce complexes in Mtb (Mce1-4) comprises six substrate-binding proteins (SBPs; MceA-F), each of which contains four conserved domains (N-terminal transmembrane, MCE, helical and C-terminal unstructured tail domains). Here, the properties of the various domains of Mtb Mce1A and Mce4A, which are involved in the import of mycolic/fatty acids and cholesterol, respectively, are reported. In the crystal structure of the MCE domain of Mce4A (MtMce4A39-140) a domain-swapped conformation is observed, whereas solution studies, including small-angle X-ray scattering (SAXS), indicate that all Mce1A and Mce4A domains are predominantly monomeric. Further, structural comparisons show interesting differences from the bacterial homologs MlaD, PqiB and LetB, which form homohexamers when assembled as functional transporter complexes. These data, and the fact that there are six SBPs in each Mtb mce operon, suggest that the MceA-F SBPs from Mce1-4 may form heterohexamers. Also, interestingly, the purification and SAXS analysis showed that the helical domains interact with the detergent micelle, suggesting that when assembled the helical domains of MceA-F may form a hydrophobic pore for lipid transport, as observed in EcPqiB. Overall, these data highlight the unique structural properties of the Mtb Mce SBPs.
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Affiliation(s)
- Pooja Asthana
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Dhirendra Singh
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Jan Skov Pedersen
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark
| | - Mikko J. Hynönen
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Ramita Sulu
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Abhinandan V. Murthy
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Mikko Laitaoja
- Department of Chemistry, University of Eastern Finland, Joensuu, Finland
| | - Janne Jänis
- Department of Chemistry, University of Eastern Finland, Joensuu, Finland
| | - Lee W. Riley
- School of Public Health, University of California, Berkeley, California, USA
| | - Rajaram Venkatesan
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
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Dalwani S, Lampela O, Leprovost P, Schmitz W, Juffer A, Wierenga RK, Venkatesan R. Substrate specificity and conformational flexibility properties of the Mycobacterium tuberculosis β-oxidation trifunctional enzyme. J Struct Biol 2021; 213:107776. [PMID: 34371166 DOI: 10.1016/j.jsb.2021.107776] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 06/30/2021] [Accepted: 08/04/2021] [Indexed: 10/20/2022]
Abstract
The Mycobacterium tuberculosis trifunctional enzyme (MtTFE) is an α2β2 tetrameric enzyme. The α -chain harbors the 2E-enoyl-CoA hydratase (ECH) and 3S-hydroxyacyl-CoA dehydrogenase (HAD) activities and the β -chain provides the 3-ketoacyl-CoA thiolase (KAT) activity. Enzyme kinetic data reported here show that medium and long chain enoyl-CoA molecules are preferred substrates for MtTFE. Modelling studies indicate how the linear medium and long chain acyl chains of these substrates can bind to each of the active sites. In addition, crystallographic binding studies have identified three new CoA binding sites which are different from the previously known CoA binding sites of the three TFE active sites. Structure comparisons provide new insights into the properties of ECH, HAD and KAT active sites of MtTFE. The interactions of the adenine moiety of CoA with loop-2 of the ECH active site cause a conformational change of this loop by which a competent ECH active site is formed. The NAD+ binding domain (domain C) of the HAD part of MtTFE has only a few interactions with the rest of the complex and adopts a range of open conformations, whereas the A-domain of the ECH part is rigidly fixed with respect to the HAD part. Two loops, the CB1-CA1 region and the catalytic CB4-CB5 loop, near the thiolase active site and the thiolase dimer interface, have high B-factors. Structure comparisons suggest that a competent and stable thiolase dimer is formed only when complexed with the α -chains, highlighting the importance of the assembly for the proper functioning of the complex.
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Affiliation(s)
- Subhadra Dalwani
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Outi Lampela
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland; Biocenter Oulu, University of Oulu, Oulu, Finland
| | - Pierre Leprovost
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland; Biocenter Oulu, University of Oulu, Oulu, Finland
| | - Werner Schmitz
- Theoder-Boveri-Institut für Biowissenschaften der Universität Würzburg, Würzburg, Germany
| | - Andre Juffer
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland; Biocenter Oulu, University of Oulu, Oulu, Finland
| | - Rik K Wierenga
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland; Biocenter Oulu, University of Oulu, Oulu, Finland
| | - Rajaram Venkatesan
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland.
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Alam J, Rahman FT, Sah-Teli SK, Venkatesan R, Koski MK, Autio KJ, Hiltunen JK, Kastaniotis AJ. Expression and analysis of the SAM-dependent RNA methyltransferase Rsm22 from Saccharomyces cerevisiae. Acta Crystallogr D Struct Biol 2021; 77:840-853. [PMID: 34076597 PMCID: PMC8171064 DOI: 10.1107/s2059798321004149] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 04/17/2021] [Indexed: 12/04/2022] Open
Abstract
Rsm22-family proteins are conserved putative SAM-dependent methyltransferases with important functions in mitochondrial translation. Here, the results of a comparative bioinformatics analysis of Rsm22-type proteins are presented, the expression, biophysical characterization and crystallization of Saccharomyces cerevisiae Rsm22 are reported, a low-resolution SAXS structure of the protein is revealed, and SAM-dependent RNA methyl transferase activity of the protein is demonstrated. The Saccharomyces cerevisiae Rsm22 protein (Sc-Rsm22), encoded by the nuclear RSM22 (systematic name YKL155c) gene, is a distant homologue of Rsm22 from Trypanosoma brucei (Tb-Rsm22) and METTL17 from mouse (Mm-METTL17). All three proteins have been shown to be associated with mitochondrial gene expression, and Sc-Rsm22 has been documented to be essential for mitochondrial respiration. The Sc-Rsm22 protein comprises a polypeptide of molecular weight 72.2 kDa that is predicted to harbor an N-terminal mitochondrial targeting sequence. The precise physiological function of Rsm22-family proteins is unknown, and no structural information has been available for Sc-Rsm22 to date. In this study, Sc-Rsm22 was expressed and purified in monomeric and dimeric forms, their folding was confirmed by circular-dichroism analyses and their low-resolution structures were determined using a small-angle X-ray scattering (SAXS) approach. The solution structure of the monomeric form of Sc-Rsm22 revealed an elongated three-domain arrangement, which differs from the shape of Tb-Rsm22 in its complex with the mitochondrial small ribosomal subunit in T. brucei (PDB entry 6sg9). A bioinformatic analysis revealed that the core domain in the middle (Leu117–Asp462 in Sc-Rsm22) resembles the corresponding region in Tb-Rsm22, including a Rossmann-like methyltransferase fold followed by a zinc-finger-like structure. The latter structure is not present in this position in other methyltransferases and is therefore a unique structural motif for this family. The first half of the C-terminal domain is likely to form an OB-fold, which is typically found in RNA-binding proteins and is also seen in the Tb-Rsm22 structure. In contrast, the N-terminal domain of Sc-Rsm22 is predicted to be fully α-helical and shares no sequence similarity with other family members. Functional studies demonstrated that the monomeric variant of Sc-Rsm22 methylates mitochondrial tRNAs in vitro. These data suggest that Sc-Rsm22 is a new and unique member of the RNA methyltransferases that is important for mitochondrial protein synthesis.
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Affiliation(s)
- Jahangir Alam
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Aapistie 7B, FIN-90220 Oulu, Finland
| | - Farah Tazkera Rahman
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Aapistie 7B, FIN-90220 Oulu, Finland
| | - Shiv K Sah-Teli
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Aapistie 7B, FIN-90220 Oulu, Finland
| | - Rajaram Venkatesan
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Aapistie 7B, FIN-90220 Oulu, Finland
| | | | - Kaija J Autio
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Aapistie 7B, FIN-90220 Oulu, Finland
| | - J Kalervo Hiltunen
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Aapistie 7B, FIN-90220 Oulu, Finland
| | - Alexander J Kastaniotis
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Aapistie 7B, FIN-90220 Oulu, Finland
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13
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Rakesh P, Reddy BR, Srinivas C, Shekhar SR, Venkatesan R, Gopalakrishnan V, Venkatraman B. Validation of a modified FLEXPART model for short-range radiological dispersion and dose assessments in ONERS Decision Support System. Progress in Nuclear Energy 2021. [DOI: 10.1016/j.pnucene.2021.103739] [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] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Mohanty AK, Sathishkumar RS, Sahu G, Suriyaprakash R, Arunachalam KD, Venkatesan R. Spatial and seasonal variations in coastal water characteristics at Kalpakkam, western Bay of Bengal, Southeast India: a multivariate statistical approach. Environ Monit Assess 2021; 193:366. [PMID: 34046759 DOI: 10.1007/s10661-021-09115-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 05/02/2021] [Indexed: 06/12/2023]
Abstract
A study was carried out in the coastal waters of Kalpakkam with the objectives to evaluate the seasonality in hydrobiological parameters in surface and bottom waters, and assess the anthropogenic stress and monsoonal flux on a spatiotemporal scale. The study covered an area of approximately 100 km2 in the coastal environment. Relatively high values for pH, temperature, and TP were observed during the post-monsoon (POM) season. The monsoon (MON) season was linked with TN, ammonia, and DO concentrations as all these parameters have shown increased values during this season due to freshwater input. The summer (SUM) season was characterized by salinity, turbidity, nitrate, phosphate, and silicate, indicating a true marine environmental condition for plankton production. Principal component analysis (PCA) and cluster analysis (CA) indicated the presence of distinct coastal water masses with respect to seasons and sampling regions. The spatial pattern indicated the distinctness of the coastal nearshore water (CNW) and coastal offshore water (COW) with respect to water quality. The CNW was more dynamic due to direct external influence as compared to the relatively stable COW environment. Similarly, the study region in the northern part, which is continuously exposed to the backwater inputs and tourism activities, was statistically different from the southern part.
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Affiliation(s)
- A K Mohanty
- Radiological and Environmental Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India.
| | - R S Sathishkumar
- Center for Environmental Nuclear Research, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603203, India
| | - Gouri Sahu
- Radiological and Environmental Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
| | - R Suriyaprakash
- Center for Environmental Nuclear Research, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603203, India
| | - Kantha D Arunachalam
- Center for Environmental Nuclear Research, SRM Institute of Science and Technology, Kattankulathur, Chennai, 603203, India
| | - R Venkatesan
- Radiological and Environmental Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
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15
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Kabir MS, Venkatesan R, Thaker M. Multiple Sensory Modalities in Diurnal Geckos Is Associated with the Signaling Environment and Evolutionary Constraints. Integr Org Biol 2021; 2:obaa027. [PMID: 33791567 PMCID: PMC7891680 DOI: 10.1093/iob/obaa027] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
To be effective, animal signals need to be detectable in the environment, but their development and expression require resources. For multimodal communication, investment in elaborating traits in one modality could reduce the elaboration of traits in other modalities. In Cnemaspis geckos, chemical signals for conspecific communication pre-dated the evolution of visual signals, allowing us to examine the potential trade-off in signal elaboration and the current habitat associations with signal use. We studied five species of Cnemaspis and quantified visual (patch size, color characteristics) and chemical (secretory composition) traits in males, as well as key environmental parameters (temperature, humidity, light) in each of their habitats. Within species, we found some trade-off in the elaboration of signals, as the strength of several components in the visual and chemical modalities were negatively associated. Strength of some signal components in each modality was also independently associated with specific environmental parameters that affect their detection (visual traits) and persistence (chemical traits). Specifically, species with larger, brighter, and more saturated color patches were found in habitats where the brightness and chroma of light were lower. Furthermore, environments with higher substrate temperature and higher relative humidity harbored species that produced secretions with a higher percentage of saturated and aromatic compounds. Thus, the elaboration of multimodal signals in this group of Cnemaspis geckos seems to increase the efficiency of communication in the signaling-environment, but the strength of signals in different modalities is constrained by trade-offs in signal expression.
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Affiliation(s)
- M S Kabir
- Centre for Ecological Sciences, Indian Institute of Science, Bengaluru, 560 012, India
| | - R Venkatesan
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bengaluru 560 065, India.,Department of Biological Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur, West Bengal 741 246, India
| | - M Thaker
- Centre for Ecological Sciences, Indian Institute of Science, Bengaluru, 560 012, India
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16
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Daniel E, Maksimainen MM, Smith N, Ratas V, Biterova E, Murthy SN, Rahman MT, Kiema TR, Sridhar S, Cordara G, Dalwani S, Venkatesan R, Prilusky J, Dym O, Lehtiö L, Koski MK, Ashton AW, Sussman JL, Wierenga RK. IceBear: an intuitive and versatile web application for research-data tracking from crystallization experiment to PDB deposition. Acta Crystallogr D Struct Biol 2021; 77:151-163. [PMID: 33559605 PMCID: PMC7869904 DOI: 10.1107/s2059798320015223] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 11/15/2020] [Indexed: 12/26/2022] Open
Abstract
The web-based IceBear software is a versatile tool to monitor the results of crystallization experiments and is designed to facilitate supervisor and student communications. It also records and tracks all relevant information from crystallization setup to PDB deposition in protein crystallography projects. Fully automated data collection is now possible at several synchrotrons, which means that the number of samples tested at the synchrotron is currently increasing rapidly. Therefore, the protein crystallography research communities at the University of Oulu, Weizmann Institute of Science and Diamond Light Source have joined forces to automate the uploading of sample metadata to the synchrotron. In IceBear, each crystal selected for data collection is given a unique sample name and a crystal page is generated. Subsequently, the metadata required for data collection are uploaded directly to the ISPyB synchrotron database by a shipment module, and for each sample a link to the relevant ISPyB page is stored. IceBear allows notes to be made for each sample during cryocooling treatment and during data collection, as well as in later steps of the structure determination. Protocols are also available to aid the recycling of pins, pucks and dewars when the dewar returns from the synchrotron. The IceBear database is organized around projects, and project members can easily access the crystallization and diffraction metadata for each sample, as well as any additional information that has been provided via the notes. The crystal page for each sample connects the crystallization, diffraction and structural information by providing links to the IceBear drop-viewer page and to the ISPyB data-collection page, as well as to the structure deposited in the Protein Data Bank.
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Affiliation(s)
- Ed Daniel
- Biocenter Oulu, University of Oulu, Oulu, Finland
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Mirko M. Maksimainen
- Biocenter Oulu, University of Oulu, Oulu, Finland
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Neil Smith
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, United Kingdom
| | - Ville Ratas
- Biocenter Oulu, University of Oulu, Oulu, Finland
| | - Ekaterina Biterova
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Sudarshan N. Murthy
- Biocenter Oulu, University of Oulu, Oulu, Finland
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - M. Tanvir Rahman
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | | | - Shruthi Sridhar
- Biocenter Oulu, University of Oulu, Oulu, Finland
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Gabriele Cordara
- Biocenter Oulu, University of Oulu, Oulu, Finland
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Subhadra Dalwani
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Rajaram Venkatesan
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Jaime Prilusky
- Bioinformatics and Biological Computing Unit, Life Science Core Facility, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Orly Dym
- Israel Structural Proteomics Center, Life Science Core Facility, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Lari Lehtiö
- Biocenter Oulu, University of Oulu, Oulu, Finland
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | | | - Alun W. Ashton
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, United Kingdom
| | - Joel L. Sussman
- Department of Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Rik K. Wierenga
- Biocenter Oulu, University of Oulu, Oulu, Finland
- Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
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17
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Radhakrishnan D, Boopathy M, Gopalakrishnan V, Rakesh PT, Chandrasekaran S, Srinivas CV, Venkatesan R, Venkatraman B. Long-term trends in gamma radiation monitoring at the multi-facility nuclear site, Kalpakkam, South-India. Radiat Prot Environ 2021. [DOI: 10.4103/rpe.rpe_18_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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18
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Karthikeyan M, Venkatesan R, Vijayakumar V, Ravi L, Subramaniyaswamy V. White blood cell detection and classification using Euler’s Jenks optimized multinomial logistic neural networks. IFS 2020. [DOI: 10.3233/jifs-189152] [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: 11/15/2022]
Abstract
Due to the wide acceptance of White Blood Cells (WBCs) in disease diagnosis, detection and classification of WBC are hot topic. Existing methodologies have some drawbacks such as significant degree of error, higher accuracy, time bound and higher misclassification rate. A WBCs detection and classification called, Jenks Optimized Logistic Convolutional Neural Network (JO-LCNN) method has proposed. Initally, Eulers Principal Axis is used as a convolution model to obtain a rotation invariant form of image by differentiating the background and RBCs, then eliminating them which leaves only the WBCs. By eliminating the wanton features, inherent features are detected contributing to minimum misclassification rate. According to above, Jenks Optimization function is used as a pooling model to obtain feature map for lower resolution. Therefore JO-LCNN is used for removing tiny objects in image and complete nuclei. Finally, Multinomial Logistic classifier is used to classify five types of classes by means of loss function and updating weight according to the loss function, therefore classifying with higher accuracy rate. Using LISC database for WBCs with different parameters as classification accuracy, false positive rate and time complexity are performed. Result shows that JO-LCNN, efficiently improves accuracy with less time, misclassification rate than the state-of-art methods.
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Affiliation(s)
| | - R. Venkatesan
- School of Computing, SASTRA Deemed University, Thanjavur, India
| | | | - Logesh Ravi
- Sri Ramachandra Faculty of Engineering and Technology, Sri Ramachandra Institute of Higher Education and Research, Chennai, India
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19
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Sridhar S, Schmitz W, Hiltunen JK, Venkatesan R, Bergmann U, Kiema TR, Wierenga RK. Crystallographic binding studies of rat peroxisomal multifunctional enzyme type 1 with 3-ketodecanoyl-CoA: capturing active and inactive states of its hydratase and dehydrogenase catalytic sites. Acta Crystallogr D Struct Biol 2020; 76:1256-1269. [DOI: 10.1107/s2059798320013819] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 10/15/2020] [Indexed: 11/11/2022]
Abstract
The peroxisomal multifunctional enzyme type 1 (MFE1) catalyzes two successive reactions in the β-oxidation cycle: the 2E-enoyl-CoA hydratase (ECH) and NAD+-dependent 3S-hydroxyacyl-CoA dehydrogenase (HAD) reactions. MFE1 is a monomeric enzyme that has five domains. The N-terminal part (domains A and B) adopts the crotonase fold and the C-terminal part (domains C, D and E) adopts the HAD fold. A new crystal form of MFE1 has captured a conformation in which both active sites are noncompetent. This structure, at 1.7 Å resolution, shows the importance of the interactions between Phe272 in domain B (the linker helix; helix H10 of the crotonase fold) and the beginning of loop 2 (of the crotonase fold) in stabilizing the competent ECH active-site geometry. In addition, protein crystallographic binding studies using optimized crystal-treatment protocols have captured a structure with both the 3-ketodecanoyl-CoA product and NAD+bound in the HAD active site, showing the interactions between 3-ketodecanoyl-CoA and residues of the C, D and E domains. Structural comparisons show the importance of domain movements, in particular of the C domain with respect to the D/E domains and of the A domain with respect to the HAD part. These comparisons suggest that the N-terminal part of the linker helix, which interacts tightly with domains A and E, functions as a hinge region for movement of the A domain with respect to the HAD part.
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Bhowmick SA, Agarwal N, Sharma R, Sundar R, Venkatesan R, Anoopa Prasad C, Navaneeth KN. Cyclone Amphan: Oceanic Conditions Pre- and Post-Cyclone using in situ and Satellite Observations. CURR SCI INDIA 2020. [DOI: 10.18520/cs/v119/i9/1510-1516] [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: 11/15/2022]
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21
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Karthikeyan MP, Venkatesan R. Interpolative Leishman-Stained transformation invariant deep pattern classification for white blood cells. Soft comput 2020. [DOI: 10.1007/s00500-019-04662-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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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22
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Venkatesan R, Jossia Joseph K, Anoopa Prasad C, Arul Muthiah M, Ramasundaram S, Murugesh P. Differential Upper Ocean Response Depicted in Moored Buoy Observations during the Pre-Monsoon Cyclone Viyaru. CURR SCI INDIA 2020. [DOI: 10.18520/cs/v118/i11/1760-1767] [Citation(s) in RCA: 1] [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: 11/15/2022]
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23
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Sah-Teli SK, Hynönen MJ, Sulu R, Dalwani S, Schmitz W, Wierenga RK, Venkatesan R. Insights into the stability and substrate specificity of the E. coli aerobic β-oxidation trifunctional enzyme complex. J Struct Biol 2020; 210:107494. [DOI: 10.1016/j.jsb.2020.107494] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 03/09/2020] [Accepted: 03/10/2020] [Indexed: 11/17/2022]
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24
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Ambeth Kumar V, Malathi S, Venkatesan R, Ramalakshmi K, Vengatesan K, Ding W, Kumar A. Exploration of an innovative geometric parameter based on performance enhancement for foot print recognition. IFS 2020. [DOI: 10.3233/jifs-190982] [Citation(s) in RCA: 4] [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: 11/15/2022]
Affiliation(s)
- V.D. Ambeth Kumar
- Department of Computer Science and Engineering, Panimalar Engineering College, Chennai, India
| | - S. Malathi
- Department of Computer Science and Engineering, Panimalar Engineering College, Chennai, India
| | - R. Venkatesan
- Department of Computer Science and Engineering, Karunya Institute of Technology and Sciences, Coimbatore, India
| | - K. Ramalakshmi
- Department of Computer Science and Engineering, Karunya Institute of Technology and Sciences, Coimbatore, India
| | - K. Vengatesan
- Department of Computer Science and Engineering, Sanjivani College of Engineering, Kopargaon, India
| | - Weiping Ding
- School of Information Science and Technology, Nantong University, Nantong, China
| | - Abhishek Kumar
- Department of Computer Science, Institute of Science, Banaras Hindu University, Varanasi, India
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Venkatesan R, Prabu S. Hyperspectral Image Features Classification Using Deep Learning Recurrent Neural Networks. J Med Syst 2019; 43:216. [DOI: 10.1007/s10916-019-1347-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Accepted: 05/20/2019] [Indexed: 11/28/2022]
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26
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Mathew S, Natesan U, Latha G, Venkatesan R, Rao RR, Ravichandran M. Observed Warming of Sea Surface Temperature in Response to Tropical Cyclone Thane in the Bay of Bengal. CURR SCI INDIA 2018. [DOI: 10.18520/cs/v114/i07/1407-1413] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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27
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Venkatesan R, Velumani S, Ordon K, Makowska-Janusik M, Corbel G, Kassiba A. Structural and morphological data of RF-Sputtered BiVO 4 thin films. Data Brief 2018; 17:526-528. [PMID: 29876424 PMCID: PMC5988375 DOI: 10.1016/j.dib.2018.01.070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 12/27/2017] [Accepted: 01/22/2018] [Indexed: 11/16/2022] Open
Abstract
Structural and morphological modulation of rf-sputtered BiVO4 thin films deposited using mechanochemical synthesis prepared BiVO4 nano-powders as sintered target are included in this data article. The crystalline nature of as-prepared films, namely amorphous and crystalline was acquired with time and temperature dependent in-situ high temperature X-ray diffraction (HT-XRD), at a time interval of 1 h. Typical Fourier transform infrared (FT-IR) spectra of annealed thin film of monoclinic BiVO4 structure is given. Furthermore, correlation between morphologies of various substrate temperature fabricated BiVO4 thin films are presented.
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Affiliation(s)
- R Venkatesan
- Department of Electrical Engineering (SEES), CINVESTAV-IPN, Zacatenco, Av IPN #2508, Col Zacatenco, D.F. C.P. 07360, Mexico.,Institute of Molecular and Materials of Le Mans - UMR-CNRS 6283, Le Mans University, 70285 Le Mans, Lns France
| | - S Velumani
- Department of Electrical Engineering (SEES), CINVESTAV-IPN, Zacatenco, Av IPN #2508, Col Zacatenco, D.F. C.P. 07360, Mexico
| | - K Ordon
- Institute of Molecular and Materials of Le Mans - UMR-CNRS 6283, Le Mans University, 70285 Le Mans, Lns France.,Institute of Physics, Jan Dlugosz University in Czestochowa, Al.Armii Krajowej, 13/15, 42 200 Czestochowa, Poland
| | - M Makowska-Janusik
- Institute of Physics, Jan Dlugosz University in Czestochowa, Al.Armii Krajowej, 13/15, 42 200 Czestochowa, Poland
| | - G Corbel
- Institute of Molecular and Materials of Le Mans - UMR-CNRS 6283, Le Mans University, 70285 Le Mans, Lns France
| | - A Kassiba
- Institute of Molecular and Materials of Le Mans - UMR-CNRS 6283, Le Mans University, 70285 Le Mans, Lns France
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Venkatesan R, Cindrella L. Semiconductive poly[ N
1
,N
4
- bis
(thiophen-2-ylmethylene)benzene-1,4-diamine]-nickel oxide nanocomposite based ethanol sensor. J Appl Polym Sci 2018. [DOI: 10.1002/app.45918] [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: 11/07/2022]
Affiliation(s)
- R. Venkatesan
- Department of Chemistry; National Institute of Technology; Tiruchirappalli 620 015 India
| | - Louis Cindrella
- Department of Chemistry; National Institute of Technology; Tiruchirappalli 620 015 India
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Venkatesh C, Sundara Moorthy N, Venkatesan R, Aswinprasad V. Optimization of Process Parameters of Pulsed Electro Deposition Technique for Nanocrystalline Nickel Coating Using Gray Relational Analysis (GRA). Int J Nanosci 2017. [DOI: 10.1142/s0219581x17600079] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The moving parts of any mechanism and machine parts are always subjected to a significant wear due to the development of friction. It is an utmost important aspect to address the wear problems in present environment. But the complexity goes on increasing to replace the worn out parts if they are very precise. Technology advancement in surface engineering ensures the minimum surface wear with the introduction of polycrystalline nano nickel coating. The enhanced tribological property of the nano nickel coating was achieved by the development of grain size and hardness of the surface. In this study, it has been decided to focus on the optimized parameters of the pulsed electro deposition to develop such a coating. Taguchi’s method coupled gray relational analysis was employed by considering the pulse frequency, average current density and duty cycle as the chief process parameters. The grain size and hardness were considered as responses. Totally, nine experiments were conducted as per L9 design of experiment. Additionally, response graph method has been applied to determine the most significant parameter to influence both the responses. In order to improve the degree of validation, confirmation test and predicted gray grade were carried out with the optimized parameters. It has been observed that there was significant improvement in gray grade for the optimal parameters.
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Affiliation(s)
- C. Venkatesh
- Dhirajlal Gandhi College of Technology, Salem 636309, Tamil Nadu, India
| | | | - R. Venkatesan
- Kumaraguru College of Technology, Coimbatore 641049, Tamil Nadu-st, India
| | - V. Aswinprasad
- Knowledge Institute of Technology, Salem 637504, Tamil Nadu-st, India
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Venkatesan R, Balaji S, Nedumaran D, Chandirasekar R, Sasikala K. 46, XY, t (4q-; 7q+) Translocation in Laurence-Moon-Bardet-Biedl Syndrome: A Case Report. INT J HUM GENET 2017. [DOI: 10.1080/09723757.2012.11886181] [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)
- R. Venkatesan
- Unit of Human Genetics, Department of Zoology, School of Life Sciences, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
| | - S. Balaji
- Department of Medicine, Coimbatore Medical College Hospital, Coimbatore 641 014, Tamil Nadu, India
| | - D. Nedumaran
- Department of Medicine, Coimbatore Medical College Hospital, Coimbatore 641 014, Tamil Nadu, India
| | - R. Chandirasekar
- Unit of Human Genetics, Department of Zoology, School of Life Sciences, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
| | - K. Sasikala
- Unit of Human Genetics, Department of Zoology, School of Life Sciences, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
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Kanya SD, Babu KP, Venkatesan R, Kumar AN. Evaluation to prevent the Physical Changes in Colored Elastomeric Modules when exposed to various Dietary Media. J Contemp Dent Pract 2017. [PMID: 28621274 DOI: 10.5005/jp-journals-10024-2065] [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] [Indexed: 11/23/2022]
Abstract
AIM AND OBJECTIVE The aim of the study is to analyze and compare the variation of lumen size and thickness of the elastomeric colored modules when immersed in four selected dietary media. MATERIALS AND METHODS Sample size of 40 modules on each color - such as red, blue, green, and black - was taken and immersed in four dietary media (artificial saliva, coke mixed with artificial saliva, turmeric mixed with artificial saliva, and coffee mixed with artificial saliva). Beakers containing different dietary media and color modules are kept in the incubator at 37°C for 72 hours. After incubation period, all the segments of module strips removed from the dietary media were placed under the electric lamp and photographs were taken using Canon camera (SX400 IS). Photographs were transferred to GIMP software, and lumen size and thickness variation in the modules was measured. RESULTS Statistical analysis were performed using analysis of variance and t-test in Statistical Package for the Social Sciences software. It showed significant difference in thickness of black module in all dietary media. Significant difference existed between all the lumen sizes of four color modules in four dietary media. CONCLUSION This study was done to identify the material that has more changes in physical properties when exposed to various dietary media. CLINICAL SIGNIFICANCE According to the results obtained, black color modules have increased in lumen size in all dietary media. In thickness, red color module showed less variation and black color module exhibited more variation.
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Affiliation(s)
- S Dhivya Kanya
- Department of Orthodontics and Dentofacial Orthopedics, Sri Ramakrishna Dental College and Hospital, Coimbatore, Tamil Nadu, India, Phone: +919443007701, e-mail:
| | - K Pradeep Babu
- Department of Orthodontics and Dentofacial Orthopedics, Indira Gandhi Institute of Dental Sciences, Puducherry, India
| | - R Venkatesan
- Private Dental Clinic, Coimbatore, Tamil Nadu, India
| | - A Nanda Kumar
- Department of Orthodontics and Dentofacial Orthopedics Meenakshi Ammal Dental College, Chennai, Tamil Nadu India
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Venkatesan R, Bagul K, Goel G, Sannappanavar N, Vijaykumar D. Does Axillary Tucking During Modified Radical Mastectomy Reduce Seroma Formation? – a Randomised Control Trial in 100 Patients. Clin Oncol (R Coll Radiol) 2017. [DOI: 10.1016/j.clon.2016.10.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kumudha P, Venkatesan R. Cost-Sensitive Radial Basis Function Neural Network Classifier for Software Defect Prediction. ScientificWorldJournal 2016; 2016:2401496. [PMID: 27738649 PMCID: PMC5050670 DOI: 10.1155/2016/2401496] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2015] [Accepted: 11/10/2015] [Indexed: 12/02/2022] Open
Abstract
Effective prediction of software modules, those that are prone to defects, will enable software developers to achieve efficient allocation of resources and to concentrate on quality assurance activities. The process of software development life cycle basically includes design, analysis, implementation, testing, and release phases. Generally, software testing is a critical task in the software development process wherein it is to save time and budget by detecting defects at the earliest and deliver a product without defects to the customers. This testing phase should be carefully operated in an effective manner to release a defect-free (bug-free) software product to the customers. In order to improve the software testing process, fault prediction methods identify the software parts that are more noted to be defect-prone. This paper proposes a prediction approach based on conventional radial basis function neural network (RBFNN) and the novel adaptive dimensional biogeography based optimization (ADBBO) model. The developed ADBBO based RBFNN model is tested with five publicly available datasets from the NASA data program repository. The computed results prove the effectiveness of the proposed ADBBO-RBFNN classifier approach with respect to the considered metrics in comparison with that of the early predictors available in the literature for the same datasets.
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Affiliation(s)
- P Kumudha
- Department of Computer Science and Engineering, Coimbatore Institute of Technology, Coimbatore, Tamil Nadu 641 014, India
| | - R Venkatesan
- Department of Computer Science and Engineering, PSG College of Technology, Coimbatore, Tamil Nadu 641 004, India
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Lix JK, Venkatesan R, Grinson G, Rao RR, Jineesh VK, Arul MM, Vengatesan G, Ramasundaram S, Sundar R, Atmanand MA. Differential bleaching of corals based on El Niño type and intensity in the Andaman Sea, southeast Bay of Bengal. Environ Monit Assess 2016; 188:175. [PMID: 26887314 DOI: 10.1007/s10661-016-5176-8] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 02/10/2016] [Indexed: 06/05/2023]
Abstract
The Andaman coral reef region experienced mass bleaching events during 1998 and 2010. The purpose of this study is to investigate the role of the El Niño in the coral reef bleaching events of the Andaman region. Both Niño 3.4 and 3 indices were examined to find out the relationship between the mass bleaching events and El Niño, and correlated with sea surface temperature (SST) anomalies in the Andaman Sea. The result shows that abnormal warming and mass bleaching events in the Andaman Sea were seen only during strong El Niño years of 1997-1998 and 2009-2010. The Andaman Sea SST was more elevated and associated with El Niño Modoki (central Pacific El Niño) than conventional El Niño (eastern Pacific El Niño) occurrences. It is suggested that the development of hot spot patterns around the Andaman Islands during May 1998 and April-May 2010 may be attributed to zonal shifts in the Walker circulation driven by El Niño during the corresponding period.
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Affiliation(s)
- J K Lix
- National Institute of Ocean Technology, Chennai, 600 100, India.
- Cochin University of Science and Technology, Kochi, 682 016, India.
| | - R Venkatesan
- National Institute of Ocean Technology, Chennai, 600 100, India
| | - George Grinson
- Central Marine Fisheries Research Institute, Kochi, 682 018, India
| | - R R Rao
- National Institute of Ocean Technology, Chennai, 600 100, India
- Indian Institute of Tropical Meteorology, Pune, 411 008, India
| | - V K Jineesh
- National Institute of Oceanography, Kochi, 682 018, India
| | - Muthiah M Arul
- National Institute of Ocean Technology, Chennai, 600 100, India
| | - G Vengatesan
- National Institute of Ocean Technology, Chennai, 600 100, India
| | - S Ramasundaram
- National Institute of Ocean Technology, Chennai, 600 100, India
| | - R Sundar
- National Institute of Ocean Technology, Chennai, 600 100, India
| | - M A Atmanand
- National Institute of Ocean Technology, Chennai, 600 100, India
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Anbarasi M, Rajkumar G, Krishnakumar S, Rajendran P, Venkatesan R, Dinesh T, Mohan J, Venkidusamy S. Learning style-based teaching harvests a superior comprehension of respiratory physiology. Adv Physiol Educ 2015; 39:214-217. [PMID: 26330041 DOI: 10.1152/advan.00157.2014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Students entering medical college generally show vast diversity in their school education. It becomes the responsibility of teachers to motivate students and meet the needs of all diversities. One such measure is teaching students in their own preferred learning style. The present study was aimed to incorporate a learning style-based teaching-learning program for medical students and to reveal its significance and utility. Learning styles of students were assessed online using the visual-auditory-kinesthetic (VAK) learning style self-assessment questionnaire. When respiratory physiology was taught, students were divided into three groups, namely, visual (n = 34), auditory (n = 44), and kinesthetic (n = 28), based on their learning style. A fourth group (the traditional group; n = 40) was formed by choosing students randomly from the above three groups. Visual, auditory, and kinesthetic groups were taught following the appropriate teaching-learning strategies. The traditional group was taught via the routine didactic lecture method. The effectiveness of this intervention was evaluated by a pretest and two posttests, posttest 1 immediately after the intervention and posttest 2 after a month. In posttest 1, one-way ANOVA showed a significant statistical difference (P=0.005). Post hoc analysis showed significance between the kinesthetic group and traditional group (P=0.002). One-way ANOVA showed a significant difference in posttest 2 scores (P < 0.0001). Post hoc analysis showed significance between the three learning style-based groups compared with the traditional group [visual vs. traditional groups (p=0.002), auditory vs. traditional groups (p=0.03), and Kinesthetic vs. traditional groups (p=0.001)]. This study emphasizes that teaching methods tailored to students' style of learning definitely improve their understanding, performance, and retrieval of the subject.
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Affiliation(s)
- M Anbarasi
- Department of Physiology, Dhanalakshmi Srinivasan Medical College and Hospital, Perambalur, Tamilnadu, India;
| | - G Rajkumar
- Department of Paediatrics, Dhanalakshmi Srinivasan Medical College and Hospital, Perambalur, Tamilnadu, India; and
| | - S Krishnakumar
- Department of Physiology, Chennai Medical College Hospital and Research Center, Trichy, Tamilnadu, India
| | - P Rajendran
- Department of Physiology, Chennai Medical College Hospital and Research Center, Trichy, Tamilnadu, India
| | - R Venkatesan
- Department of Physiology, Dhanalakshmi Srinivasan Medical College and Hospital, Perambalur, Tamilnadu, India
| | - T Dinesh
- Department of Physiology, Dhanalakshmi Srinivasan Medical College and Hospital, Perambalur, Tamilnadu, India
| | - J Mohan
- Department of Physiology, Dhanalakshmi Srinivasan Medical College and Hospital, Perambalur, Tamilnadu, India
| | - S Venkidusamy
- Department of Physiology, Dhanalakshmi Srinivasan Medical College and Hospital, Perambalur, Tamilnadu, India
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Rakesh PT, Venkatesan R, Hedde T, Roubin P, Baskaran R, Venkatraman B. Simulation of radioactive plume gamma dose over a complex terrain using Lagrangian particle dispersion model. J Environ Radioact 2015; 145:30-39. [PMID: 25863323 DOI: 10.1016/j.jenvrad.2015.03.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 03/06/2015] [Accepted: 03/15/2015] [Indexed: 06/04/2023]
Abstract
FLEXPART-WRF is a versatile model for the simulation of plume dispersion over a complex terrain in a mesoscale region. This study deals with its application to the dispersion of a hypothetical air borne gaseous radioactivity over a topographically complex nuclear site in southeastern France. A computational method for calculating plume gamma dose to the ground level receptor is introduced in FLEXPART using the point kernel method. Comparison with another similar dose computing code SPEEDI is carried out. In SPEEDI the dose is calculated for specific grid sizes, the lowest available being 250 m, whereas in FLEXPART it is grid independent. Spatial distribution of dose by both the models is analyzed. Due to the ability of FLEXPART to utilize the spatio-temporal variability of meteorological variables as input, particularly the height of the PBL, the simulated dose values were higher than SPEEDI estimates. The FLEXPART-WRF in combination with point kernel dose module gives a more realistic picture of plume gamma dose distribution in a complex terrain, a situation likely under accidental release of radioactivity in a mesoscale range.
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Affiliation(s)
- P T Rakesh
- Indira Gandhi Center for Atomic Research, Kalpakkam, India.
| | - R Venkatesan
- Indira Gandhi Center for Atomic Research, Kalpakkam, India
| | | | | | - R Baskaran
- Indira Gandhi Center for Atomic Research, Kalpakkam, India
| | - B Venkatraman
- Indira Gandhi Center for Atomic Research, Kalpakkam, India
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Rajanbabu A, Venkatesan R, Chandramouli S, Nitu PV. Sentinel node detection in endometrial cancer using indocyanine green and fluorescence imaging-a case report. Ecancermedicalscience 2015; 9:549. [PMID: 26180548 PMCID: PMC4494816 DOI: 10.3332/ecancer.2015.549] [Citation(s) in RCA: 4] [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] [Received: 04/27/2015] [Indexed: 11/25/2022] Open
Abstract
Sentinel lymph node mapping in endometrial cancer can help to provide the prognostic information needed while avoiding the morbidity associated with a complete lymphadenectomy. Studies with blue dye and technetium colloid have only given about 80% detection rates whereas with indocyanine green injection and fluorescence imaging, it gives about 88–100% detection rates. Herein, we report a case where indocyanine green was injected intracervically and sentinel nodes were detected at the paraaortic nodal area.
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Affiliation(s)
- Anupama Rajanbabu
- Amrita institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - R Venkatesan
- Amrita institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - Satish Chandramouli
- Amrita institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
| | - P V Nitu
- Amrita institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Kochi, Kerala 682041, India
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Fukao T, Akiba K, Goto M, Kuwayama N, Morita M, Hori T, Aoyama Y, Venkatesan R, Wierenga R, Moriyama Y, Hashimoto T, Usuda N, Murayama K, Ohtake A, Hasegawa Y, Shigematsu Y, Hasegawa Y. The first case in Asia of 2-methyl-3-hydroxybutyryl-CoA dehydrogenase deficiency (HSD10 disease) with atypical presentation. J Hum Genet 2014; 59:609-14. [PMID: 25231369 DOI: 10.1038/jhg.2014.79] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 04/24/2014] [Accepted: 08/20/2014] [Indexed: 11/09/2022]
Abstract
2-Methyl-3-hydroxybutyryl-CoA dehydrogenase (2M3HBD) deficiency (HSD10 disease) is a rare inborn error of metabolism, and <30 cases have been reported worldwide. This disorder is typically characterized by progressive neurodegenerative disease from 6 to 18 months of age. Here, we report the first patient with this disorder in Asia, with atypical clinical presentation. A 6-year-old boy, who had been well, presented with severe ketoacidosis following a 5-day history of gastroenteritis. Urinary organic acid analysis showed elevated excretion of 2-methyl-3-hydroxybutyrate and tiglylglycine. He was tentatively diagnosed with β-ketothiolase (T2) deficiency. However, repeated enzyme assays using lymphocytes showed normal T2 activity and no T2 mutation was found. Instead, a hemizygous c.460G>A (p.A154T) mutation was identified in the HSD17B10 gene. This mutation was not found in 258 alleles from Japanese subjects (controls). A normal level of the HSD17B10 protein was found by immunoblot analysis but no 2M3HBD enzyme activity was detected in enzyme assays using the patient's fibroblasts. These data confirmed that this patient was affected with HSD10 disease. He has had no neurological regression until now. His fibroblasts showed punctate and fragmented mitochondrial organization by MitoTracker staining and had relatively low respiratory chain complex IV activity to those of other complexes.
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Affiliation(s)
- Toshiyuki Fukao
- 1] Department of Pediatrics, Graduate School of Medicine, Gifu University, Gifu, Japan [2] Medical Information Sciences Division, United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu, Japan
| | - Kazuhisa Akiba
- Department of General Pediatrics, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan
| | - Masahiro Goto
- Department of Endocrinology and Metabolism, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan
| | - Nobuki Kuwayama
- Department of Pediatrics, Graduate School of Medicine, Gifu University, Gifu, Japan
| | - Mikiko Morita
- Department of Pediatrics, Graduate School of Medicine, Gifu University, Gifu, Japan
| | - Tomohiro Hori
- Department of Pediatrics, Graduate School of Medicine, Gifu University, Gifu, Japan
| | - Yuka Aoyama
- Medical Information Sciences Division, United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu, Japan
| | - Rajaram Venkatesan
- Faculty of Biochemistry and Molecular Medicine and Biocenter Oulu, University of Oulu, Oulu, Finland
| | - Rik Wierenga
- Faculty of Biochemistry and Molecular Medicine and Biocenter Oulu, University of Oulu, Oulu, Finland
| | - Yohsuke Moriyama
- Department of Anatomy and Cell Biology, Fujita Health University School of Medicine, Toyoake, Japan
| | - Takashi Hashimoto
- Department of Anatomy and Cell Biology, Fujita Health University School of Medicine, Toyoake, Japan
| | - Nobuteru Usuda
- Department of Anatomy and Cell Biology, Fujita Health University School of Medicine, Toyoake, Japan
| | - Kei Murayama
- Department of Metabolism, Chiba Children's Hospital, Chiba, Japan
| | - Akira Ohtake
- 1] Department of Endocrinology and Metabolism, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan [2] Department of Pediatrics, Saitama Medical University, Moroyama, Japan
| | - Yuki Hasegawa
- Department of Pediatrics, Shimane University School of Medicine, Izumo, Japan
| | - Yosuke Shigematsu
- Department of Health Science, Faculty of Medical Sciences, University of Fukui, Eiheiji-cho, Japan
| | - Yukihiro Hasegawa
- Department of Endocrinology and Metabolism, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan
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Venkatesan R, Sah-Teli SK, Awoniyi LO, Jiang G, Prus P, Kastaniotis AJ, Hiltunen JK, Wierenga RK, Chen Z. Insights into mitochondrial fatty acid synthesis from the structure of heterotetrameric 3-ketoacyl-ACP reductase/3R-hydroxyacyl-CoA dehydrogenase. Nat Commun 2014; 5:4805. [DOI: 10.1038/ncomms5805] [Citation(s) in RCA: 32] [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] [Received: 02/24/2014] [Accepted: 07/24/2014] [Indexed: 12/19/2022] Open
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Manjumeena R, Elakkiya T, Duraibabu D, Feroze Ahamed A, Kalaichelvan PT, Venkatesan R. ‘Green’ biocompatible organic–inorganic hybrid electrospun nanofibers for potential biomedical applications. J Biomater Appl 2014; 29:1039-55. [DOI: 10.1177/0885328214550011] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Gold nanoparticles were prepared by green route using Couroupita guianensis leaves extract. The green synthesized gold nanoparticles exhibited maximum absorbance at 526 nm in the ultraviolet spectrum. By incorporating the green synthesized gold nanoparticles in poly(vinyl alcohol) matrix, unique green organic–inorganic hybrid nanofibers (poly (vinyl alcohol)–gold nanoparticles) were developed by electrospinning. Contact angle measurements showed that the prepared poly (vinyl alcohol)–gold nanoparticles were found to be highly hydrophilic. The crystallinity of gold nanoparticles was analyzed using XRD. The synthesized gold nanoparticles and poly (vinyl alcohol)–gold nanoparticles were characterized using high-resolution transmission electron microscope, Fourier transform-infrared spectroscopy and energy-dispersive analysis of X-ray. The ultimate aim of the present work is to achieve optimum antibacterial, antifungal, biocompatibility and antiproliferative activities at a very low loading of gold nanoparticles. Vero cell lines showed a maximum of 90% cell viability on incubation with the prepared poly (vinyl alcohol)–gold nanoparticles. MCF 7 and HeLa cell lines proliferated only to 8% and 9%, respectively, on incubation with the poly (vinyl alcohol)–gold nanoparticles, and also exhibited good antibacterial and antifungal activities against test pathogenic bacterial and fungal strains. Thus, the poly (vinyl alcohol)–gold nanoparticles could be used for dual applications such as antimicrobial, anticancer treatment besides being highly biocompatible.
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Affiliation(s)
- R Manjumeena
- CAS in Botany, University of Madras, Guindy Campus, Chennai, Tamil Nadu, India
| | - T Elakkiya
- Department of Chemistry, Anna University, Chennai, Tamil Nadu, India
| | - D Duraibabu
- Department of Chemistry, Anna University, Chennai, Tamil Nadu, India
| | - A Feroze Ahamed
- Department of Microbial Technology, School of Biological Sciences, Madurai Kamaraj University, Madurai, Tamil Nadu, India
| | - PT Kalaichelvan
- CAS in Botany, University of Madras, Guindy Campus, Chennai, Tamil Nadu, India
| | - R Venkatesan
- National Institute of Ocean Technology, Chennai, Tamil Nadu, India
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Chandirasekar R, Kumar BL, Sasikala K, Jayakumar R, Suresh K, Venkatesan R, Jacob R, Krishnapriya EK, Kavitha H, Ganesh GK. Assessment of genotoxic and molecular mechanisms of cancer risk in smoking and smokeless tobacco users. Mutat Res Genet Toxicol Environ Mutagen 2014; 767:21-7. [PMID: 24769293 DOI: 10.1016/j.mrgentox.2014.04.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2013] [Revised: 03/29/2014] [Accepted: 04/11/2014] [Indexed: 12/25/2022]
Abstract
Inexpensive forms of tobacco are widely used in developing countries such as India. We have evaluated genotoxicity endpoints (chromosome aberrations, micronucleus frequency, comet assay) and polymorphisms of the XRCC1 and p53 genes among smokers and smokeless tobacco (SLT) users in rural Tamilnadu, South India. Cytogenetic, DNA damage and SNP analyses were performed on peripheral blood samples; micronucleus frequency was measured in peripheral blood and buccal mucosa exfoliated cells. Both categories of tobacco users had elevated levels of genotoxic damage. SNP analysis of tobacco users revealed that 17% carry the XRCC1 gln399gln genotype and 19% carry the p53 pro72pro genotype. Both genotypes are associated with increased risk of cancer.
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Affiliation(s)
- R Chandirasekar
- Unit of Human Genetics, Department of Zoology, Bharathiar University, Coimbatore 641 046, Tamilnadu, India.
| | - B Lakshman Kumar
- Departments of Biotechnology and Zoology, Kongunadu Arts and Science College, Coimbatore 641 029, India
| | - K Sasikala
- Unit of Human Genetics, Department of Zoology, Bharathiar University, Coimbatore 641 046, Tamilnadu, India
| | - R Jayakumar
- Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - K Suresh
- Unit of Human Genetics, Department of Zoology, Bharathiar University, Coimbatore 641 046, Tamilnadu, India
| | - R Venkatesan
- Unit of Human Genetics, Department of Zoology, Bharathiar University, Coimbatore 641 046, Tamilnadu, India
| | - Raichel Jacob
- Unit of Human Genetics, Department of Zoology, Bharathiar University, Coimbatore 641 046, Tamilnadu, India
| | - E K Krishnapriya
- Unit of Human Genetics, Department of Zoology, Bharathiar University, Coimbatore 641 046, Tamilnadu, India
| | - H Kavitha
- Departments of Biotechnology and Zoology, Kongunadu Arts and Science College, Coimbatore 641 029, India
| | - G Karthik Ganesh
- Department of Bioinformatics, Bharathiar University, Coimbatore 641 046, Tamilnadu, India
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Rajanbabu A, Kuriakose S, Ahmad SZ, Khadakban T, Khadakban D, Venkatesan R, Vijaykumar DK. Evolution of surgery in advanced epithelial ovarian cancer in a dedicated gynaecologic oncology unit-seven year audit from a tertiary care centre in a developing country. Ecancermedicalscience 2014; 8:422. [PMID: 24834117 PMCID: PMC3998656 DOI: 10.3332/ecancer.2014.422] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Indexed: 11/06/2022] Open
Abstract
AIMS To audit our performance as a dedicated gynaecologic oncology unit and to analyse how it has evolved over the years.To retrospectively evaluate the outcome of advanced ovarian cancer treated with neoadjuvant chemotherapy (NACT) followed by interval surgery versus upfront surgery. METHODS AND RESULTS One hundred and ninety-eight patients with advanced epithelial ovarian cancer (EOC) who were treated from 2004 to 2010 were analysed. Eighty-two patients (41.4%) underwent primary surgery and 116 (58.6%) received NACT. Overall, an optimal debulking rate of 81% was achieved with 70% for primary surgery and 88% following NACT. The optimal cytoreduction rate has improved from 55% in 2004 to 97% in 2010. In primary surgery, the optimal debulking rate increased from 42.8% in 2004 to 93% in 2010, whereas in NACT group the optimal cytoreduction rate increased from 60% to 100% by 2010. On the basis of the surgical complexity scoring system it was found that surgeries with intermediate complexity score had progressively increased over the years. There was a mean follow-up of 21 months ranging from 6 to 70 months. The progression-free survival and overall survival (OS) in patients undergoing primary surgery were 23 and 40 months, respectively, while it was 22 and 40 months in patients who received NACT. However, patients who had suboptimal debulking, irrespective of primary treatment, had significantly worse OS (26 versus 47 months) compared with those who had optimal debulking. CONCLUSIONS As a dedicated gynaecologic oncology unit there has been an increase in the optimal cytoreduction rates. The number of complex surgeries, as denoted by the category of intermediate complexity score, has increased. Patients with advanced EOC treated with NACT followed by interval debulking have comparable survival to the patients undergoing primary surgery. Optimal cytoreduction irrespective of primary modality of treatment gives better survival.
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Affiliation(s)
- Anupama Rajanbabu
- Department of Surgical and Gynaecologic Oncology, Amrita Institute of Medical Sciences and Amrita Vishwavidyapeetham, Kochi, Kerala, India
| | - Santhosh Kuriakose
- Department of Surgical and Gynaecologic Oncology, Amrita Institute of Medical Sciences and Amrita Vishwavidyapeetham, Kochi, Kerala, India
| | - Sheikh Zahoor Ahmad
- Department of Surgical and Gynaecologic Oncology, Amrita Institute of Medical Sciences and Amrita Vishwavidyapeetham, Kochi, Kerala, India
| | - Tejal Khadakban
- Department of Surgical and Gynaecologic Oncology, Amrita Institute of Medical Sciences and Amrita Vishwavidyapeetham, Kochi, Kerala, India
| | - Dhiraj Khadakban
- Department of Surgical and Gynaecologic Oncology, Amrita Institute of Medical Sciences and Amrita Vishwavidyapeetham, Kochi, Kerala, India
| | - R Venkatesan
- Department of Surgical and Gynaecologic Oncology, Amrita Institute of Medical Sciences and Amrita Vishwavidyapeetham, Kochi, Kerala, India
| | - D K Vijaykumar
- Department of Surgical and Gynaecologic Oncology, Amrita Institute of Medical Sciences and Amrita Vishwavidyapeetham, Kochi, Kerala, India
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Vedaprakash L, Dineshram R, Ratnam K, Lakshmi K, Jayaraj K, Mahesh Babu S, Venkatesan R, Shanmugam A. Experimental studies on the effect of different metallic substrates on marine biofouling. Colloids Surf B Biointerfaces 2013; 106:1-10. [DOI: 10.1016/j.colsurfb.2013.01.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 01/02/2013] [Indexed: 10/27/2022]
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Venkatesan R, Wierenga RK. Structure of mycobacterial β-oxidation trifunctional enzyme reveals its altered assembly and putative substrate channeling pathway. ACS Chem Biol 2013; 8:1063-73. [PMID: 23496842 DOI: 10.1021/cb400007k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The incidence of tuberculosis is increasing due to the appearance of new drug-resistant variants. A thorough understanding of the disease organism is essential in order to create more effective drugs. In an attempt to understand better the poorly studied lipid metabolism of Mycobacterium tuberculosis (Mtb), we identified and characterized its fatty acid β-oxidation complex (trifunctional enzyme (TFE)). TFE is an α(2)β(2) complex consisting of two types of polypeptides catalyzing three of the four reactions of the β-oxidation of fatty acids. The kinetic constants (k(cat) and K(m)) show that the complexed α chain is more active than the individual α chain. Crystal structures of Mtb TFE (mtTFE) reveal that the quaternary assembly is strikingly different from the already known Pseudomonas fragi TFE (pfTFE) assembly due to the presence of a helical insertion (LA5) in the mtTFE-β subunit. This helical insertion prevents the pfTFE mode of assembly, as it would clash with helix H9A of the TFE-α chain. The mtTFE assembly appears to be more rigid and results in a different substrate channeling path between the α and the β subunits. Structural comparisons suggest that the mtTFE active sites can accommodate bulkier fatty acyl chains than in pfTFE. Although another thiolase (FadA2), more closely related to human TFE-β/thiolase, is present in the Mtb genome, it does not form a complex with mtTFE-α. Extensive phylogenetic analyses show that there are at least four TFE subfamilies. Our studies highlight the molecular properties of mtTFE, significantly extending the structural knowledge on this type of very interesting multifunctional enzymes.
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Affiliation(s)
- Rajaram Venkatesan
- Department of Biochemistry and Biocenter
Oulu, University of Oulu, Oulu 90014, Finland
| | - Rik K. Wierenga
- Department of Biochemistry and Biocenter
Oulu, University of Oulu, Oulu 90014, Finland
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Venkatramaiah N, Ramakrishna B, Venkatesan R, Almeida Paz FA, Tomé JPC. Facile synthesis of highly stable BF3-induced meso-tetrakis (4-sulfonato phenyl) porphyrin (TPPS4)-J-aggregates: structure, photophysical and electrochemical properties. NEW J CHEM 2013. [DOI: 10.1039/c3nj00482a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Abstract
Objective: To study the role of the community pharmacists in improving knowledge and glycemic control in patients with type 2 diabetes residing in villages of Coimbatore district, Tamil Nadu. Materials and Methods: Fifty patients were interviewed, of whom 39 subjects were included in the study. The literate and chronic diabetic patients were included in the study and illiterate, children below 12 years of age, pregnant women, nursing mothers and subjects with any other chronic disorders were excluded from the study. The subjects were interviewed and divided randomly into two groups. There were 20 subjects in the control group and 19 in the intervention group. The study protocol was explained to all the participants, and written informed consent was obtained from them. Before the initiation of the study, the subjects were interviewedfor 20–40 min to educate them about diabetes. Subjects in the intervention group received continuous counselling and medical advice to improve their awareness about the disease and drugs. During the study period, the Diabetes Care Profile (a questionnaire developed by J.J. Fitzgerald of the Michigan Diabetes Research and Training Center, University of Michigan Medical School, Michigan) was performed to each subject. The interval between visits was 2 months. All the values are expressed in mean ± standard deviation. Results: The intervention group showed better progress in the recovery of diabetics because of the continuous counselling and monitoring. There were significant changes in Diabetes Care Profile subscale scores in both the control and the intervention groups at the end of the study, viz. 1.8 ± 4.52 to 2.75 ± 6.62 and 3.10 ± 3.23 to 1.53 ± 2.66. Similarly, the knowledge test score was found to be increased in the intervention group compared with the baseline values (8.53 ± 1.81 to 12.16 ± 1.34). Conclusions: At the end of the study period, the patients of the intervention group had very good glycemic control. Their health status and understanding of diabetes and its management were better, and they had fewer problems such as episodes of hyperglycemia or hypoglycemia.
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Affiliation(s)
- R Venkatesan
- Department of Pharmacy Practice, College of Pharmacy, Sri Ramakrishna Institute of Paramedical Sciences, Coimbatore, Tamil Nadu, India
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Sharma S, Bhaumik P, Schmitz W, Venkatesan R, Hiltunen JK, Conzelmann E, Juffer AH, Wierenga RK. The Enolization Chemistry of a Thioester-Dependent Racemase: The 1.4 Å Crystal Structure of a Reaction Intermediate Complex Characterized by Detailed QM/MM Calculations. J Phys Chem B 2012; 116:3619-29. [DOI: 10.1021/jp210185m] [Citation(s) in RCA: 14] [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: 01/25/2023]
Affiliation(s)
- Satyan Sharma
- Biocenter Oulu and Department
of Biochemistry, University of Oulu, P.O.
Box 3000, Oulu, FI-90014, Finland
| | - Prasenjit Bhaumik
- Protein Structure Section, Macromolecular
Crystallography Laboratory, National Cancer Institute, Frederick, Maryland 21702, United States
| | - Werner Schmitz
- Theodor-Boveri-Institut für
Biowissenschaften (Biozentrum) der Universität Würzburg, Am Hubland, D-97074 Würzburg,
Germany
| | - Rajaram Venkatesan
- Biocenter Oulu and Department
of Biochemistry, University of Oulu, P.O.
Box 3000, Oulu, FI-90014, Finland
| | - J. Kalervo Hiltunen
- Biocenter Oulu and Department
of Biochemistry, University of Oulu, P.O.
Box 3000, Oulu, FI-90014, Finland
| | - Ernst Conzelmann
- Theodor-Boveri-Institut für
Biowissenschaften (Biozentrum) der Universität Würzburg, Am Hubland, D-97074 Würzburg,
Germany
| | - André H. Juffer
- Biocenter Oulu and Department
of Biochemistry, University of Oulu, P.O.
Box 3000, Oulu, FI-90014, Finland
| | - Rik K. Wierenga
- Biocenter Oulu and Department
of Biochemistry, University of Oulu, P.O.
Box 3000, Oulu, FI-90014, Finland
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Chandirasekar R, Suresh K, Sasikala K, Kumar BL, Venkatesan R, Ganesh GK, Jacob R. Genotoxicity assessment in smokeless tobacco users: a case-control study. Toxicol Ind Health 2012; 29:216-23. [PMID: 22317826 DOI: 10.1177/0748233711432571] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
India has a long history of tobacco, which includes chewing tobacco and smoking tobacco in various forms. Initially, the smokeless tobacco chewing habit was seen among the majority of the farmers who cultivated tobacco; but in recent years, smokeless tobacco is available in many forms and is cheaper as well and hence it is widely being used among literate and illiterate people. The subjects of our study are living in hilly regions of Yerkaud in Salem district, South India. Most of the inhabitants of our study area are illiterate and more particularly they are unaware of the health effects due to tobacco use. Recent epidemiological reports have strongly indicated the association of cancer risk with usage of smokeless tobacco. The prime aim of our study is to evaluate the genotoxic effects of tobacco use by analysing the cytogenetic end points such as chromosome aberrations in peripheral blood and micronucleus in peripheral blood and buccal cells. About 85 smokeless tobacco users were enrolled for the study and same numbers of age- and sex-matched nontobacco users were also enrolled to serve as controls. The result of our study revealed that tobacco users displayed varied levels of elevated chromosomal damage and micronucleated cells than nontobacco users. The variation in the extent of genetic damage was dependent on the duration of the tobacco use. In conclusion, this study might be helpful in creating awareness on the hazards of the smokeless tobacco products among the global population as a whole for those who chose such products as a cheap alternative to tobacco smoke.
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Affiliation(s)
- R Chandirasekar
- Unit of Human Genetics, Department of Zoology, Bharathiar University, Coimbatore, Tamil Nadu, India.
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