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Vinod Kumar,Firdaus Jahan,Shailendra Raghuwanshi,Richi V. Mahajan,Rajendra Kumar Saxena 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.4
A novel and simple method was developed for the preparation of magnetic Fe3O4 nanoparticles by chemical co-precipitation method and subsequent coating with 3-aminopropyltrimethoxysilane (APTMS) through silanization process. Magnetic Fe3O4-chitosan particles were prepared by the suspension cross-linking and covalent technique to be used in the application of magnetic carrier technology. The synthesized immobilization supports were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and X-ray diffraction (XRD). Using glutaraldehyde as the coupling agent, the lipase from R. oryzae was successfully immobilized onto the functionalized magnetic Fe3O4-chitosan beads. The results showed that 86.60% of R. oryzae lipase was bound on the synthesized immobilization support. This immobilized lipase was successfully used for the esterification of phenolic acid which resulted in esterification of phenolic acid in isooctane solvent reaction system for 8 consecutive cycles (totally 384 h), 72.6% of its initial activity was retained,indicating a high stability in pharmaceutical and industrial applications.
Recycling of printed circuit boards (PCBs) to generate enriched rare metal concentrate
Vinod Kumar,이재천,정진기,Manis Kumar Jha,김병수,Ratnakar Singh 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
An eco-friendly process for recycling obsolete PCBs to get enriched rare-metal concentrate usingphysical separation technique is discussed. Metal concentration in digital video disc (DVD) PCBs is43 wt.% whereas in vacuum cleaner (VC) PCBs 30 wt.% with rare metal of 2.8%. Concentrate grade of88% total metals including 5.85% rare metals in-case of DVD-PCBs while 90% of total metalsincluding 2.81% rare metals in-case of VC-PCBs was achieved by froth flotation. While 75% totalmetals including 9.41% rare metals for DVD-PCBs and 65% total metals including 5.10% rare metalsfor VC-PCBs was obtained by pneumatic separation.
Seven spices of India—from kitchen to clinic
Vinod Kumar 한국식품연구원 2020 Journal of Ethnic Foods Vol.7 No.-
Spices play a vital role in Indian cuisine since long time. These are the some of the most valuable items of domestic as well as industrial kitchens. The role of spices is to increase the palatability and used as a flavoring, coloring, and preservative agents. Rather than cooking spices is the part of many industry like medical, cosmetic, pharmaceutical and perfumery, and many more. In the current, study explores the role of spices in kitchen as well in medical industry as it acts as anti-proliferative, anti-hypercholesterolemia, anti-diabetic, and anti-inflammatory effects on human health. Spices also help to curing many diseases like diabetes, cardiovascular diseases, arthritis cancer, and AIDS. This review outlines the role of some spices used in the Indian kitchen for its flavor and taste which are potential to maintain a healthy heart.
Vinod Kumar,Rajat Kumar,Deepa Rawat,Manisha Nanda 한국응용생명화학회 2018 Applied Biological Chemistry (Appl Biol Chem) Vol.61 No.1
Microalgae have emerged as a potential alternative for the production of many useful compounds like protein, carbohydrate and lipid. Lipid-rich microalgae are important and rich source for alternative energy production. In order to commercially utilize microalgae for energy production, the lipid productivity should be enhanced. Keeping in view the above-mentioned potentials of microalgae, in the present study, we have attempted to display the role of chemical stimulants and light in the growth and lipid production of the microalgae Chlorella singularis (UUIND5). During the present investigations, effect of varying photoperiods and different types of lights and chemical stimulants, viz. CaCl2 and kinetin on growth rate and lipid production, was studied. The maximum growth rate recorded was 166 ± 0.3 mg/L/d, when 0.80 g/l CaCl2 and 0.5 mg/l kinetin were added to Bold’s basal medium. C. singularis was then cultivated in this medium for 14 days under sunlight ?LED (10-h sunlight ? 14-h LED light) at photoperiod 24-h light/0-h dark. The maximum lipid yield 30.2% of dry wt. was obtained under sunlight ?LED. Further, the gas chromatography analysis also showed the presence of fatty acid methyl esters (FAME). FAMEs profile was analyzed according to ASTM D6751 specification. Thus, it was concluded that sunlight ?LED at 24-h light/0-h dark (100 lmol photons m-2 s-1) photoperiod with CaCl2 and kinetin is an effective strategy to boost lipid productivity in C. singularis (UUIND5).
Vinod Kumar,Satyendra Nath Sharma 한국작물학회 2011 Journal of crop science and biotechnology Vol.14 No.3
The assessment of genetic diversity is a primary concern of plant breeders and germplasm curators for which morphological traits are internationally accepted descriptors but are often associated with limitations due to G x E interactions. Phenotypic, ISSR, and SSR markers were employed to determine the genetic diversity and relationships among 20 commercially cultivated sesame genotypes representing different geographical regions of India. A narrow range of genetic dissimilarity (0.01 - 0.12) with mixed clustering was observed using morphological descriptors. A total 279 band positions with 57% polymorphism was amplified by ISSR primers,whereas 36 allelic positions with 73% polymorphism were produced by SSR primers with 100% reproducibility. The ISSR primers with high discrimination power were identified producing genotype-specific bands and distinguishing all the sesame genotypes used in this study. A poor correlation and lack of perfect congruence between phenotypes and marker-based analysis was indicated by the UPGMA dendrogram and PCA analysis. Our results suggest that SSR and ISSR markers provide a powerful tool for genotype identification and establishment of genetic relationships among sesame genotypes. We recommend the use of molecular markers for testing,required for obtaining intellectual property rights, and also for the analysis of genotypic diversity among sesame varieties.
Vinod Kumar,이재천,정진기,김병수 한국자원공학회 2010 한국자원공학회지 Vol.47 No.5
Waste electrical and electronics (WEEE) contain metals, glass, and plastics in association with several hazardous materials. WEEE processing usually involves dismantling the discarded equipments followed by sorting and segregation of different components such as glass, large plastics, metal composites and other special parts and reusable units. Segregated scraps are subjected to comminution for effective liberation of constituent metals from the associated nonmetallic materials. Physical beneficiation methods such as gravity, magnetic and electrostatic separation are generally employed to separate light weight fractions, and ferrous and non-ferrous metals. Metallic concentrate can further be subjected to hydrometallurgical treatment for the extraction and recovery of metals. In this review, current status of treatment of waste printed circuit boards (PCBs) and recycling technologies in practice are presented. The problems encountered in the existing recycling processes are particularly discussed. A processing approach involving application of inexpensive and eco-friendly unit operations based on the physical beneficiation for complete recycling and resource utilization of all materials with high efficiency for waste PCBs is highlighted and discussed in brief.
Vinod Kumar,Ramesh Chand Bansal,Raghuveer Raj Joshi 대한전기학회 2008 International Journal of Control, Automation, and Vol.6 No.5
While the matrix converter has many advantages that include bi-directional power flow, a size reduction, a long lifetime, and sinusoidal input currents, it is vulnerable to the input voltage disturbances, because it directly exchanges the input voltage to the output voltage. So, in this paper, a critical evaluation of the effect of various abnormal voltage conditions like unbalanced power supply, balanced non-sinusoidal power supply, input voltage sags and short time blackout of power supply on matrix converter fed induction motor drives is presented. The operation under various abnormal conditions has been analyzed. For this, a 230V, 250VA three phase to three phase matrix converter (Me) fed induction motor drive prototype is implemented using DSP based controller and tests have been carried out to evaluate and improve the stability of system under typical abnormal conditions. Digital storage oscilloscope & power quality analyzer are used for experimental observations.
Analyzing the Impact of Value Satisfaction on Behavioral Intention to Use E-Resources
Vinod Kumar,Vandana,Ruchi Jain Garg,Adil Zia 한국과학기술정보연구원 2022 Journal of Information Science Theory and Practice Vol.10 No.3
The present study investigates the impact of perceived value metrics in driving satisfaction and behavioral intention to use e-resource among its users. Utilitarian, hedonic, uniqueness, epistemic, and economic are key values selected for the purpose of investigation in the study. This empirical study is carried out through a survey and responses have been analyzed using structural equation modelling. The target group is selected by means of simple random sampling (users of e-resources in selected business schools). Findings of the study reveal that utilitarian values, hedonic values, epistemic values, and uniqueness values have a significant impact on the usage intention of e-resources; however, economic values reflect an insignificant relationship to intention to use e-resources. The study is a distinctive piece of work on investigating the most and the least significant value(s) associated with satisfaction and usage intentions of e-resources.