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Gupta, Raman,Gupta, Monika,Paul, Satya,Gupta, Rajive Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.10
A simple and efficient method has been developed for Knoevenagel condensation between aldehydes or ketones and active methylene group by stirring in methylene chloride at 60 ${^{\circ}C}$ under heterogeneous conditions using silica supported ammonium acetate. The products are obtained in excellent yields and are in a state of high purity. The structures of the products were confirmed by IR, $^1H$ NMR and mass spectral data and comparison with authentic samples available commercially.
Rajive Gupta,Satinder K. Juneja,Monika Gupta,Satya Paul 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.12
A solvent-free procedure is developed for the regeneration of carbonyl compounds from aldoximes or ketoximes by grinding at room temperature and from hydrazone, phenylhydrazone or semicarbazone derivatives under microwave irradiation using dioxane-dibromide/SiO2. Products are obtained in excellent yields and are in a state of high purity.
Raman Gupta,Monika Gupta,Satya Paul,Rajive Gupta 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.10
A simple and efficient method has been developed for Knoevenagel condensation between aldehydes or ketones and active methylene group by stirring in methylene chloride at 60 oC under heterogeneous conditions using silica supported ammonium acetate. The products are obtained in excellent yields and are in a state of high purity. The structures of the products were confirmed by IR, 1H NMR and mass spectral data and comparison with authentic samples available commercially.
( Gupta Anil Kumar ),( Rajiv Pathak ),( Bharat Singh ),( Hemlata Gautam ),( Ram Kumar ),( Raj Kumar ),( Rajesh Arora ),( Hemant K. Gautam ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.6
A Gram-positive bacterium was isolated from the saline soils of Jangpura (U.P.), India, and showed high-level of radiation-resistant property and survived upto 12.5 kGy dose of gamma radiation. The 16S rDNA sequence of this strain was examined, identified as Bacillus sp. strain HKG 112, and was submitted to the NCBI GenBank (Accession No. GQ925432). The mechanism of radiation resistance and gene level expression were examined by proteomic analysis of whole-cell extract. Two proteins, 38 kDa and 86.5 kDa excised from SDS-PAGE, which showed more significant changes after radiation exposure, were identified by MALDI-TOF as being flagellin and S-layer protein, respectively. Twenty selected 2-DE protein spots from the crude extracts of Bacillus sp. HKG 112, excised from 2- DE, were identified by liquid chromatography mass spectrometry (LC-MS) out of which 16 spots showed significant changes after radiation exposure and might be responsible for the radiation resistance property. Our results suggest that the different responses of some genes under radiation for the expression of radiation-dependent proteins could contribute to a physiological advantage and would be a significant initial step towards a fullsystem understanding of the radiation stress protection mechanisms of bacteria in different environments.
A cadaveric study of arteriovenous trigone of heart: the triangle of Brocq and Mouchet
Swati Bansal,Rajiv Jain,Virendra Budhiraja,Shveta Swami,Rimpi Gupta 대한해부학회 2023 Anatomy & Cell Biology Vol.56 No.2
Left coronary artery divides into anterior interventricular branch and circumflex branch. As both the arteries runin their corresponding grooves, an arteriovenous trigone is formed between conus arteriosus and left auricle called triangle of Brocq and Mouchet. The triangle base is formed by great cardiac vein. This study aims to describe the frequency of triangle and its type and relationship between various boundaries and content of triangle and to supplement the existing knowledge of clinicians. This observational and descriptive study was conducted on 40 formalin fixed cadaveric hearts in department of anatomy, Kalpana chawla government medical college. The triangle was found in 92.5% of specimen with most common type being closed (51.3%) which is followed by inferiorly open in 35.1%, superiorly open in 8.1% and completely open in 5.4% hearts. Most frequent content of triangle was median artery followed by diagonal branches of anterior interventricular and circumflex branches. The mean area of the triangle was 246.3mm2. Relationship of vein with two arterial branches was either superficial or deep. The knowledge of different patterns of existence will be required for angiographic procedures. Further the triangle is a potential epicardial access route to left fibrous ring. Thus detailed knowledge of variations will help cardiologist to achieve better outcome in interventional procedures with minimal complications.
Tuning phase retardation behaviour of nematic liquid crystal using quantum dot
Swadesh Kumar Gupta,Dharmendra Pratap Singh,Rajiv Manohar,Sandeep Kumar 한국물리학회 2016 Current Applied Physics Vol.16 No.1
We here report on the phase retardation behavior of nematic liquid crystal (NLC) doped with CdSe quantum dot (QD). A study of birefringence and relative permittivity in 4-octyl-40-cyanobiphenyl (8CB) NLC and its variation with doping of QDs has been presented. The study shows improvement of NLC ordering after addition of QDs. The observed higher value of birefringence in QD doped NLC system has been attributed to improved alignment due to additional order in NLC by self assembled QDs. The improved order of NLC system has also been explained by a schematic illustration for pristine and QD doped NLC system. Study of relative permittivity has also revealed the ordering effect in QD dispersed NLC system.
Swadesh Kumar Gupta,Dharmendra Pratap Singh,Rajiv Manohar 한국물리학회 2013 Current Applied Physics Vol.13 No.4
Effect of single wall carbon nanotubes (SWCNTs) on electro-optical performance of a ferroelectric liquid crystal (FLC) has been studied. Voltage dependent spontaneous polarization and response time measurement has been made for the pure and SWCNT doped FLC system. Dielectric measurement has also been performed to understand the existing interaction between SWCNTs and FLC molecules. The results have shown increase in the value of spontaneous polarization and relative permittivity with slight slower response for the doped system. The observed properties of doped system revealed that the SWCNTs can perform well with FLC at low applied electric field to enhance the performance of LC devices.
Numerical investigation of a star's trajectory in binary Quasar system
VINAY KUMAR,BEENA R GUPTA,RAJIV AGGARWAL 장전수학회 2016 Advanced Studies in Contemporary Mathematics Vol.26 No.3
In this paper, we have considered Time-Frequency analysis (TFA) based on wavelets for the identification and classification of trajectories in a nonlinear dynamical model. Time-Frequency Analysis (TFA) is the relatively fast method. Ridge-plots (Time-frequency landscape) obtained from Time-Frequency Analysis (TFA) extracts instantaneous frequency from the phase of continuous wavelet transform (CWT). The nonlinear model considered in the analysis is the binary system of quasars hosted in the pair of interacting disk galaxies introduced recently. We have characterized the different type of trajectories like periodic, quasi-periodic, chaotic sticky, chaotic non-sticky, weakly and strongly chaotic. We have shown a comparative study between Time-Frequency Analysis (TFA) and a well-established method Lyapunov Characteristic Exponent (LCE). We have also presented the graphs explaining the phenomenon of transient chaos and resonance trapping.