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Vinayagamoorthy, Nadimuthu,Yim, Seon-Hee,Jung, Seung-Hyun,Park, Sung-Won,Kim, Young Jin,Kim, Bong-Jo,Chung, Yeun-Jun Springer Science and Business Media LLC 2015 Journal of human genetics Vol.60 No.8
<P>Calcium is a universal intracellular messenger that has an important role in controlling various cellular processes. In this study, we explored genetic polymorphisms to identify novel loci influencing serum calcium levels in East Asians through a two-stage genome-wide association study with the sample of 8642 unrelated Koreans (4558 for discovery and 4093 for replication). Using single-nucleotide polymorphism (SNP) arrays, we discovered 963 associated SNPs in stage 1, and replicated 105 SNPs among them in stage 2. We examined them in a combined set of stage 1 and 2 samples and observed that 65 SNPs were significantly associated with serum calcium levels. Among them, rs13068893 in the CASR gene showed the strongest significance (P=3.85 10(-8)). Considering the high allele frequency and significance level of the rs13068893C>G in the CASR gene, this SNP may have a key role in regulating the serum calcium level. We also successfully replicated the four loci (CASR, CSTA, DGKD and GCKR) using our data set that have been previously reported to be significantly associated with calcium levels in Europeans and Indians. Further studies with more East Asian subjects or meta-analyses on them may enable validation of our results and identification of novel genetic loci associated with serum calcium levels.</P>
R. Vinayagamoorthy,I. V. Manoj,G. Narendra Kumar,I. Sai Chand,G. V. Sai Charan Kumar,K. Suneel Kumar 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.5
Machining of polymeric composite is inevitable during assembly of components. In view of making holes on structural composites, drilling is essential and a study to optimize the machining parameters is very important. The present study has been made to investigate the defaces and cutting forces associated during drilling of natural fiber reinforced plastics. Plastic composite has been manufactured using chemically treated vetiveria zizanioides as the reinforcement and polyester as the matrix. The composite has been drilled several times on the basis of central composite design. Speed and feed rate of the spindle, point angle and diameter of the tool are considered as the input parameters. Deface of each hole during entry and exit, thrust force and torque have been measured as the output parameters. A fuzzy model has been created and a comparative study between the central composite design and fuzzy model is made. The design has been optimized with the objective of minimizing the output parameters and a set of confirmatory experiments have been conducted. The central composite model has been validated by comparing it with the fuzzy model and confirmatory runs. The comparison presented only a minimal error and hence the modeling by central composite design and fuzzy are consummate.
Ramanan, Rishiram,Vinayagamoorthy, Nadimuthu,Sivanesan, Saravana Devi,Kannan, Krishnamurthi,Chakrabarti, Tapan The Korean Society of Phycology 2012 ALGAE Vol.27 No.4
Carbon concentrating mechanisms play a vital role in photosynthesis in microalgae and cyanobacteria especially in the proper functioning of Rubisco and assimilation of carbon via the Calvin cycle. This study evaluates the role of carbon dioxide on carbon concentrating mechanism (CCM) in a cynaobacteria, Spirulina platensis and a microalga, Chlorella sp. 786. The study organisms were grown in both atmospheric (control sample, 0.035%) and high (exposed sample, 10%) $CO_2$ concentrations. Second dimension (2D) electrophoresis revealed a huge difference in the protein profiles of both organisms suggesting the induction of CCM related proteins in the sample maintained at atmospheric $CO_2$ concentration and the repression of CCM related proteins in the sample maintained at 10% $CO_2$. Liquid chromatography-mass spectroscopy analysis revealed the presence of two important $C_i$ transporter proteins in the control sample of S. platensis, namely ferredoxin-$NADP^+$ reductase and ATP binding cassette (ABC) transport system protein. These proteins were only expressed in the control sample and were downregulated or not expressed at all in the exposed sample. Consequently, this study conclusively proves that CCMs are only inducted at low $CO_2$ concentrations and are not functional at high $CO_2$ concentration.
Babu, B. Ramesh,Vinayagamoorthy, P.,Gopalakrishnan, S. Korean Library and Information Science Society 2007 한국도서관정보학회지 Vol.47 No.3
This paper aims to present a brief overview of consortia' initiatives that have been taking place at national and International level. The developed countries witnessed the progressive growth of consortia initiatives; on the other hand, the situation is not encouraging in developing countries like India. Therefore in this paper an attempt has been made to trace the current developments in consortia awareness in Engineering Educational Institutions. For this purpose, a survey of Engineering Educational Institutions in Tamil Nadu has been considered to measure the consortia awareness and also the attitude towards Joining any consortia. Based on the results of the survey a model consortium has been proposed for the Engineering Educational Institutions in Tamil Nadu. 이 논문은 국가 및 국제수준에서 이루어지고 있는 컨소시엄사업에 대해 개괄적으로 살펴보기 위한 것이다. 선진국에서는 컨소시엄사업이 점차 증가하고 있는 반면, 인도와 같은 개발도상국에서는 상황이 좋지 않은 편이다. 이 논문에서는 이러한 시각에서 인도 타밀 나두 주의 공학교육기관들의 컨소시엄에 대한 인식을 살펴보고자 하였다. 컨소시엄에 대한 인식과 컨소시엄 가입에 대한 태도를 측정하기 위해 이 지역 공학교육기관들에 대한 실태조사를 실시하였다. 조사결과를 바탕으로 이 지역 공학교육기관을 위한 모형 컨소시엄을 제안하였다.
Rishiram Ramanan,Nadimuthu Vinayagamoorthy,Saravana Devi Sivanesan,Krishnamurthi Kannan,Tapan Chakrabarti 한국조류학회I 2012 ALGAE Vol.27 No.4
Carbon concentrating mechanisms play a vital role in photosynthesis in microalgae and cyanobacteria especially in the proper functioning of Rubisco and assimilation of carbon via the Calvin cycle. This study evaluates the role of carbon dioxide on carbon concentrating mechanism (CCM) in a cynaobacteria, Spirulina platensis and a microalga, Chlorella sp. 786. The study organisms were grown in both atmospheric (control sample, 0.035%) and high (exposed sample, 10%)CO2 concentrations. Second dimension (2D) electrophoresis revealed a huge difference in the protein profiles of both organisms suggesting the induction of CCM related proteins in the sample maintained at atmospheric CO2 concentration and the repression of CCM related proteins in the sample maintained at 10% CO2. Liquid chromatography-mass spectroscopy analysis revealed the presence of two important Ci transporter proteins in the control sample of S. platensis,namely ferredoxin-NADP+ reductase and ATP binding cassette (ABC) transport system protein. These proteins were only expressed in the control sample and were downregulated or not expressed at all in the exposed sample. Consequently,this study conclusively proves that CCMs are only inducted at low CO2 concentrations and are not functional at high CO2concentration.
CONSORTIA INITIATIVES IN ENGINEERING EDUCATIONAL INSTITUTIONS IN TAMIL NADU(INDIA)
B. Ramesh Babu,P. Vinayagamoorthy,S. Gopalakrishnan 한국도서관·정보학회 2007 한국도서관정보학회지 Vol.38 No.4
This paper aims to present a brief overview of consortia' initiatives that have been taking place at national and international level. The developed countries witnessed the progressive growth of consortia initiatives; on the other hand, the situation is not encouraging in developing countries like India. Therefore in this paper an attempt has been made to trace the current developments in consortia awareness in Engineering Educational Institutions. For this purpose, a survey of Engineering Educational Institutions in Tamil Nadu has been considered to measure the consortia awareness and also the attitude towards joining any consortia. Based on the results of the survey a model consortium has been proposed for the Engineering Educational Institutions in Tamil Nadu.
Purification and Characterization of a Novel Plant-type Carbonic Anhydrase from Bacillus subtilis
Rishiram Ramanan,Krishnamurthi Kannan,Nadimuthu Vinayagamoorthy,Saravana Devi Sivanesan,Kunga Mohan Ramkumar,Tapan Chakrabarti 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.1
Carbonic anhydrase enzyme, one of the fastest known enzymes, remains largely unexplored in prokaryotes when compared to its mammalian counterparts despite its ubiquity. In this study, the enzyme has been purified from Bacillus subtilis SA3 using sequential Sephadex G-75 chromatography, DEAE cellulose chromatography, and sepharose-4B-L-tyrosine-sulphanilamide affinity chromatography and characterized to provide additional insights into its properties. The apparent molecular mass of carbonic anhydrase obtained by SDS-PAGE was found to be approximately 37 kDa. Isoelectric focusing of the purified enzyme revealed an isoelectric point (pI) of around 6.1 when compared with marker. The presence of metal ions such as Zn2+, Co2+, Cu2+, Fe3+, Mg2+, and anion SO4- increased enzyme activity while strong inhibition was observed in the presence of Hg2+, Cl-, HCO3-, and metal chelator EDTA. The optimum pH and temperature for the enzyme were found to be 8.3 and 37℃, respectively. Enzyme kinetics with p-nitrophenyl acetate as substrate at pH 8.3 and 37℃ determined the Vmax and Km values of the enzyme to be 714.28 μmol/mg protein/min and 9.09 mM, respectively. The Ki value for acetazolamide was 0.22 mM, compared to 0.099 mM for sulphanilamide. The results from N-terminal amino acid sequencing imply the purified protein is a putative beta-carbonic anhydrase with close similarities to CAs from plants, microorganisms.
Karunakaran Chockalingam,Singh I. Jeba,Vinayagamoorthy Pazhamalai 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.2
Cubic Ag2O-deposited anatase TiO2 nanospheres with cubic Ni0.5Zn0.5Fe2O4-core have been obtained by a 2-stage synthesis. They have been characterized by energy-dispersive X-ray spectroscopy, high-resolution scanning and transmission electron microscopies, X-ray and selected area electron diffractometries, vibrating sample magnetometry, nitrogen adsorption and desorption, and UV–visible diffuse reflectance and photoluminescence spectroscopies. The synthesized samples are superparamagnetic and absorb UV-A light and visible light in the entire wavelength range. Structure directing agent polyvinylpyrrolidone provides little influence on the Ag2O-capping process. The synthesized Ni0.5Zn0.5Fe2O4-core/Ag2O-capped TiO2-shell nanospheres are whole visible light-active magnetically recoverable photocatalyst; capped Ag2O sensitizes anatase TiO2 under whole visible light and the ferrite core buried in TiO2 lattice enables magnetic recovery of the photocatalytic nanospheres.