Photo-induced rapid biosynthesis of silver nanoparticle using aqueous extract of Xanthium strumarium and its antibacterial and antileishmanial activity

Vijay Kumar,Ravi Kumar Gundampati,Devendra Kumar Singh,Medicherla V. Jagannadham,Shyam Sundar,Syed Hadi Hasan 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-

The current work describes the biosynthesis of stable AgNPs using aqueous extract of Xanthiumstrumarium (AEX) which act as both reducing as well as a stabilizing agent. The biosynthesis wasconfirmed by UV–visible spectroscopy where the presence of SPR band at lmax 436 nm corresponded tothe existence of AgNPs in reaction mixture. The optimum conditions for biosynthesis of AgNPs were30 min of sunlight exposure time, 3.0% (v/v) of AEX inoculum dose and 3.5 mM AgNO3 concentration. The synthesized AgNPs was characterized by HRTEM, SAED, FESEM, EDX, XRD, AFM, and FTIR whichshowed potent antibacterial and antileishmanial activity.

Effect of Cu-doping on the photoluminescence and photoconductivity of template synthesized CdS nanowires

Kumar, Vijay,Kumar, Kapil,Jeon, H.C.,Kang, T.W.,Lee, Dongjin,Kumar, Sunil Elsevier 2019 The Journal of physics and chemistry of solids Vol.124 No.-

<P><B>Abstract</B></P> <P>Cu-doped CdS nanowires were synthesized within the pores of anodic alumina membrane as template via electrochemical deposition. Morphological, structural, optical and photoconductive properties of the synthesized nanowires were studied. Morphological and structural properties were studied by using SEM with EDS (point & line mapper mode) and X-Ray Diffractometer. Scanning electron microscopy with point EDS and line EDS mapping confirms the deposition of pure CdS and Cu-doped CdS throughout the template length respectively. XRD investigations shows the presence of polycrystalline phase and cubic structure of pristine CdS nanowires. Optical properties were studied by UV–visible absorption spectroscopy and time resolved photoluminescence. A gradual decrease in energy band gap from 2.38 eV to 2.10 eV is observed for Cu doped CdS nanowires. Time resolved photoluminescence studies shows the red shift in emission wavelength and increase of excited state lifetimes with Cu doping and also with increase in its concentration in CdS nanowires. Current-voltage characteristics of pure and doped CdS nanowires studied at varying incident light intensity show that the Cu doped nanowires show negative photoconductivity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Copper doping is done successfully in CdS nanowires grown by template synthesis technique. </LI> <LI> TRPL studies give the idea of the transitions involved with and without Cu doping in the nanowires. </LI> <LI> Photoconductivity studies revealed negative photoconductivity in case of copper doped nanowires. </LI> <LI> 1D CdS:Cu nanowires are found to be a attractive candidate for photoluminescence and photoconductivity applications. </LI> </UL> </P>

Squamous Cell Carcinoma in Exstrophy of the Bladder

Pramod Kumar Sharma,Praveen Kumar Pandey,Mukesh Kumar Vijay,Malay Kumar Bera,Jitendra Pratap Singh,Kaushik Saha 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.8

Exstrophy of the bladder is a rare congenital anomaly with an incidence of about 1 per 50,000 newborns. The malignant potential of the exstrophied bladder mucosa is well known; 95% are adenocarcinomas, and 3% to 5% are squamous cell carcinomas. Most of the malignant tumors (60%) associated with an exstrophy of the bladder occur during the fourth and fifth decades of life. Of the remaining, about 20% each occur after 60 years and before 40 years. Here we present a case in which squamous cell carcinoma developed in an unrepaired exstrophy of the bladder. We present the management of the case and a brief review of the literature.

DEVELOPMENT OF AGRI-BOT FOR SEED SOWING AUTOMATION

Vijay K. Pandey,Vijay Kumar Gupta,Tanuja Sheorey 제어로봇시스템학회 2023 제어로봇시스템학회 국제학술대회 논문집 Vol.2023 No.10

Phytochemical analysis and antimicrobial potential of Nigrospora sphaerica (Berk. & Broome) Petch, a fungal endophyte isolated from Dillenia indica L.

Vijay Kumar,I. B. Prasher 경희대학교 융합한의과학연구소 2023 Oriental Pharmacy and Experimental Medicine Vol.23 No.2

Endophytic fungi from medicinal plants are a rich source of new biologically active compounds. In the present study, an endophytic fungus Nigrospora sphaerica (Berk. & Broome) Petch was isolated from Dillenia indica L and was characterized morphologically and at molecular levels. The isolated fungus was investigated for antibacterial activity, antifungal activity, antioxidant activity, total phenolics and flavonoids content, and its responsible bioactive molecules. The toxicity test revealed that the crude extract of Nigrospora sphaerica inhibited the growth of pathogenic bacteria, i.e., E. coli, Staphylococcus aureus, Bacillus subtilis and Pseudomonas aeruginosa. The value of MIC (Minimum inhibitory concentration) ranges from 82–115 µg/mL for the selected bacteria. The isolated endophytic fungus exhibited the highest inhibition against the Fusarium oxysporum (72%) and the lowest inhibition against Aspergillus niger (55%). The maximum scavenging activity was 88.1% at 600 µg/mL with an IC50 value of 85 µg/mL. GC–MS (Gas chromatography-Mass spectroscopy) analysis of the ethyl acetate extract revealed the presence of more than 40 compounds. Some of the major compounds present in extract were 1H-Indene, 1-methylene-(3.64%), Dodecane (8.52%), Tetradecane (11.59%), (-)-Mellein (3.85%), Hexadecane (10.13%), 1,2,5-Oxadiazole-3,4-dicarboxamide (5.95%), Octadecane (6.46%) and Benzoic acid, 2-(dimethylamino) ethyl ester. The compounds present in the extracts have various biological activities such as antiviral, antioxidant, insecticidal, cytotoxic, antihyperglycemic, antibacterial, antifungal activity. The compounds present in the extract can be used in clinical trials for further applications. To the best of our knowledge, this is the first report on bioactive molecules produced by Nigrospora sphaerica isolated from Dillenia indica L. having antioxidant and antimicrobial activity.

New Generalized SVPWM Algorithm for Multilevel Inverters

Kumar, A. Suresh,Gowri, K. Sri,Kumar, M. Vijay The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.4

In this paper a new generalized space vector pulse width modulation scheme is proposed based on the principle of reverse mapping to drive the switches of multilevel inverters. This projected scheme is developed based on the middle vector of the subhexagon which holds the tip of the reference vector, which plays a major role in mapping the reference vector. A new approach is offered to produce middle vector of the subhexagon which holds tip of the reference vector in the multilevel space vector plane. By using middle vector of the subhexagon, reference vector is linked towards the inner two level sub-hexagon. Then switching vectors, switching sequence and dwell times corresponding to a particular sector of a two-level inverter are determined. After that, by using the two level stage findings, the switching vectors related to exact position of the reference vector are directly generated based on principle of the reverse mapping approach and do not need to be found at n level stage. In the reverse mapping principle, the middle vector of subhexagon is added to the formerly found two level switching vectors. The proposed generalized algorithm is efficient and it can be applied to an inverter of any level. In this paper, the proposed scheme is explained for a five-level inverter and the performance is analyzed for five level and three level inverters through MATLAB. The simulation results are validated by implementing the propose scheme on a V/f controlled three-level inverter fed induction motor using dSPACE control desk.

Optimization of Lipase Production using Differential Evolution

Vijay Kumar Garlapati,Rintu Banerjee 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.2

Differential Evolution (DE) coupled with Response Surface Methodology (RSM) has been used for the optimization of extracellular lipolytic enzyme production by Rhizopus oryzae NRRL 3562 through sold state fermentation. The input space of the experimentally validated RSM-model was optimized using a novel Differential Evolution approach, which works based on the natural selection and survival of the fittest concepts of the biological world. The maximum lipase activity of 96.52 U/gds was observed with the DE stated optimum values of 35.59oC, 1.50, 5.28, and 4.83 days for temperature, liquid to solid ratio, pH, and incubation time respectively. The optimal levels of control parameters namely number of population, generations, crossover operator, and mutation constant were equal to 20, 50, 0.6, and 0.20, respectively. The developed model and its optimization are generic in nature and thus appear to be useful for the design and scale-up of the extracellular lipase production by R. oryzae NRRL 3562 through solid state fermentation.

FPGA-based Development of Finite State-MPC for Three-Phase Grid-Connected VSI System

Vijay Kumar Singh,Ravi Nath Tripathi,Tsuyoshi Hanamoto 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

Power converters are used for grid integration of renewable sources that can achieve certain objectives through system control. Finite state - model predictive control (FS-MPC) is one of the techniques used for the grid integration of voltage source inverter (VSI) and possessing distinctive features such as fast dynamic performance and ability to incorporate constraints inherently. However, system development is one of the concern for FS-MPC due to computational delay problem. Field programmable gate array (FPGA) based system development is a way to tackle the mentioned problem because of its parallel processing nature. In this paper, FS-MPC is presented for three-phase grid-connected VSI system using modeling-based digital system design approach that is advantageous for analysis, easy debugging and FPGA-based system development. The integrated platform of MATLAB-Simulink and system generator is used for modeling and Hardware-in-the-loop (HIL) simulation to validate the system.

Trajectory of Voice Rehabilitation in Ortner’s Syndrome: A Case Report

Vijay Kumar,Akriti Kumar,Anjali Sharma 한국언어재활사협회 2023 Clinical Archives of Communication Disorders Vol.8 No.2

The First Greeting Speech Act between Korean and Indian

Vijay Kumar Yadav(비제이 쿠마 야더워) 학습자중심교과교육학회 2019 학습자중심교과교육연구 Vol.19 No.8

본 연구에서는 인도인 한국어 학습자(IKL)와 한국인 모어화자(KNS) 사이에 첫 인사할 때 어떤 시사점이 나타나는지에 대한 파악하고자 하였다. 첫 인사를 할 때, 모국어(힌디어 모어 화자,INS) 영향이 얼마나 미치는지에 대한 확인하기 위해서 인도인 힌디어 모어 화자를 선택했다. 모든 집단에 20명이었다. 모든 참여자가 네루대학교에서 공부하는 대학원생이었고 나이는 20대-30대 있었다. 인도인 한국어 학습자를 토픽 (3급-5급) 기준으로 선택 했다. 3급-5급 학습자를 선택한 이유는 초급 학습자가 첫 인사 화행에 대한 지식이 부족하기 때문이다. 선행 연구에서 몇 가지 상황을 선택해서 설문지(쓰는 형식으로) 만들고 세 집 단의 대상으로 담화완성 테스트(DCT)를 통해서 자료를 수집했다. 그리고 썰 Searle( 1976)틀로 바탕으로 얻은 자료를 분석했다. 분석한 결과에 따라서 두 집단(KNS하고 IKL) 사이에 비슷한 점과 비슷하지 않는 점을 제시했다. This research was done in three groups KNS(Korean Native Speakers), IKL(Indian Korean Learners) and INS(Indian Native Speakers) in order to understand the similarities and differences between KNS and IKl about first greeting speech act. INS participants were included in order to understand the mother language influence to IKL while learning the foreign language. In each of the three groups there were 20 participants who were studying in Jawaharlal Nehru University(JNU). the IKL participants were selected based on topic level 3-5. Most of these participants were undergraduate or graduate students and theirs age were between 20s-30s. Present researched was conducted in the form of DCT (Discourse Completion Tests)under the different circumstances in the questionnaire based on previous researched which was in the written form. After the materials were collected by DCT, results were analyzed based on the Searle(1976) model analysis. And the similarities and differences between KNS and IKl about first greeting speech act were presented.