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Kashyap Shreyas J.,Sankannavar Ravi,Madhu G. M. 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6
Hydroxyapatite (HAp) nanomaterials have been synthesized via wet-chemical precipitation route with Ca/P molar ratios of 1.40, 1.60, 1.67, 1.80 and 2.00. These samples have been characterized using scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, Fourier transform-infrared spectroscopy (FT-IR), ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy (DRS), X-ray powder diffraction (XRPD), Rietveld refinement and dielectric spectroscopy. Micrographs from SEM showed that the calcined HAp particles were spherical in shape and they were highly agglomerated. The chemical composition derived from EDX was in good accordance with the theoretical Ca/P ratio. FT-IR spectroscopy revealed the characteristic functional groups: PO 43− and OH −. Certain peaks were observed in the diff use reflectance spectrum which is argued to originate from O 2− → Ca 2+ and O 2− → P 5+ charge transfer transitions. Phase analysis showed the existence of single pure HAp ( P63 ∕m ) only for samples with Ca/P = 1.6 and 1.67. However, HAp with Ca/P = 1.4 had tri-calcium phosphate (TCP, Ca 3(PO4)2) as the secondary phase, while Ca/P = 1.8 and 2.0 had CaCO 3 as the secondary phase. Thermograms displayed multiple steps indicating the degradation of secondary phases at higher temperatures. Further, XRD analysis of post-TGA samples revealed that there was no change in the space group symmetry; however, the phase identified ′ was Ca 5(PO4)3(CO 3)0.01(OH)1.3. The dielectric constant ( ) and dielectric loss ( t an ) decline with enhancing frequency corresponding well with space-charge and ionic-type polarization behaviour. The ac electrical conductivity enhanced with increasing frequency obeying the Jonscher universal power law.
Kashyap, Pinki,Rani, Manju,Tiwari, Dinesh Pratap,Park, So-Jin The Korean Institute of Chemical Engineers 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.2
Densities (ρ) for binary mixtures of ethanol (1) + diisopropyl ether (DIPE) or cyclohexane or alkane (C<sub>6</sub>-C<sub>9</sub>) (2) were measured at 298.15 K, 308.15 K and 318.15 K. The excess molar volume (V<sup>E</sup><sub>m</sub>) of binary mixtures was calculated using ρ data and correlated with Redlich-Kister polynomial equation. The V<sup>E</sup><sub>m</sub> values for binary mixtures of ethanol (1) + cyclohexane or n-alkane (C<sub>6</sub>-C<sub>9</sub>) (2) were positive, whereas for ethanol (1) + DIPE (2) these were negative. The magnitude of V<sup>E</sup><sub>m</sub> values follows the order: cyclohexane > n-nonane > n-octane > n-heptane > n-hexane > DIPE. The V<sup>E</sup><sub>m</sub> values have been interpreted qualitatively and also quantitatively in terms of Flory-Treszczanowicz-Benson (FTB) model and Prigogine-Flory-Patterson (PFP) theory. The values V<sup>E</sup><sub>m</sub> predicted using FTB model agree well with experimental V<sup>E</sup><sub>m</sub> values at all mole fractions. But the PFP theory describes well V<sup>E</sup><sub>m</sub> data in ethanol-rich region (x<sub>1</sub> > 0.5) for all binary mixtures and is able to predict the sign of V<sup>E</sup><sub>m</sub> vs x<sub>1</sub> curve for ethanol-lean region (x<sub>1</sub> < 0.5) except for ethanol (1) + nonane (2) mixtures.
Kashyap Patil,Seonju Jeong,Hankwon Lim,Hun-Soo Byun,Sangil Han 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.4
Volatile organic compounds (VOCs) are released from various sources and are unsafe for human health. Porous materials are promising candidates for the adsorption of VOCs owing to their increased ratio of surface area to volume. In this study, activated carbon (AC) impregnated cellulose acetate (CA) electrospun mats were synthesized using electrospinning for the removal of VOCs from the air mixture of ACs, and CA solution was electrospun at different proportions (5%, 10%, and 15%) in a single nozzle system. The different AC amounts in the electrospun mats were distributed within the AC fibers. The adsorption capacities were measured for acetone, benzene, and dichloromethane, using quartz crystal microbalance. The results elicited an increasing adsorption capacity trend as a function of the impregnation of ACs in the electrospun mats, while their capacities increased as a function of the AC concentration. Dichloromethane resulted in a faster adsorption process than acetone and benzene owing to its smaller molecular size. VOCs were desorbed with the N₂ gas purging, while VOCs were adsorbed at higher temperatures owing to the increased vapor pressures. The adsorption analysis using Dubinin-Astakhov equation showed that dichloromethane is more strongly adsorbed on mats.
Kashyap Rahul,Pandey Arvind Chandra,Parida Bikash Ranjan 대한공간정보학회 2021 Spatial Information Research Vol.29 No.6
Orography of Himalaya governs the regional weather system and monsoon of Indian sub-continent. The intense persistent precipitation in the form of rainfall during monsoon season causes landslides which are the most frequent naturally occurring hazards in the Himalaya. This study attempts to investigate the spatio-temporal variability of precipitation and their effect on precipitation triggered landslides during monsoon season (June–September) in relation to relief in Himalayan region by utilizing satellitederived precipitation products (GPM) over the span of 2000–2018 in addition to NASA Landslide Viewer, Global Landslide Catalog and Global Risk Data Platform data for landslides and ASTER DEM for elevation. The results exhibit that the Eastern Himalayas received the highest amount of precipitation of 2385 mm with intensity of 19.5 mm/day, followed by the Central Himalayas with 1860 mm and intensity of 17.5 mm/day and the least in the Western Himalayas with 1400 mm and intensity of 15 mm/day, respectively. The monsoon precipitation in the lower elevations (below 2600 m) are mostly responsible for causing a vast majority of the precipitation induced landslide events with a maximum of 68.66% in the Central Himalayas followed by the Western Himalayas at 62.23% and the least in the Eastern Himalayas at 41.16%. The overall accumulated precipitation and intensity during monsoon season and landslide distribution were strongly correlated with relief pattern. This comprehensive study signifies how relief regulated the occurrences of landslides in monsoon season and recommends vegetation cover and least interference of human-induced land use to alleviate the landslides.
Kashyap, Suman,Tharannum, Seema,R, Taarini The Korean Society of Plant Biotechnology 2019 식물생명공학회지 Vol.46 No.2
Efficient protocol for plant shoot regeneration of Brassica juncea L. CZERN was established by using organic media components and growth stimulating factors of the vermicompost and coelomic fluids. Formulated organic plant tissue culture media (Vermicompost (30%) extracts supplemented with 20 mL/L coelomic fluid) have shown maximum shoot regeneration when compared with the Murashige and Skoog (MS) medium, which were supplemented with 1 mg/L 6-benzyladenine (BA) and 0.1 mg/L of Naphthaleneacetic acid (NAA). Cotyledon explants produced the highest shoot regeneration frequency from fourday-old germinated seedlings in comparison with non-germinated seedlings. The vermicompost extracts have proved to be the best organic plant growth media to induce shoots from cotyledons compared to the MS media. Statistically significant difference (P = 0.008) for the root length, shoot length (P=0.000350) and the leaves (P=0.375) of the mustard plantlets were analyzed successfully. The survival rate was 98% in the mustard cotyledons on the Vermicompost extract media and 63% on MS media respectively. The coelomic fluid also is much suitable to induce shoots from cotyledons at lower concentrations. It was also shown that the vermicompost extract, which comprised of humic acids along with coelomic fluid, affected shoot regeneration from the cotyledons. An efficient and organic shoot regeneration study was standardized and it can be applicable in the improvement of the economically important crops.
Kashyap, Raghava,Mittal, Bhagwant Rai,Chakraborty, Dhritiman,Bhattacharya, Anish,Singh, Baljinder The Korea Society of Nuclear Medicine 2010 핵의학 분자영상 Vol.44 No.4
We present a case of poorly differentiated muscle invasive transitional cell carcinoma in a 64-year-old male diagnosed with FDG-avid mass in the urinary bladder wall and multiple skeletal muscles visualised on F-18 FDG PET/CT.
Pinki Kashyap,Manju Rani,Dinesh Pratap Tiwari,박소진 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.11
Dynamic viscosities (η) of the binary liquid mixtures of 2-propanol (1)+n-alkanes (C6, C7, C9) (2) at T=288.15 K to 303.15 K and ethanol (1)+n-alkanes (C6, C7 , C8) (2) at T=308.15 K to 318.15 K were experimentally measured over the whole composition range. Experimental values of η were used to compute the deviation in dynamic viscosity (Δη) and these Δη values were correlated with the Redlich-Kister equation. The η values of binary mixtures were also calculated using several empirical correlations and mixing rules like Grunberg-Nissan, Tamura-Kurata, Kati- Chaudhari and McLaughlin-Ubbelohde and found that the Grunberg-Nissan correlation gave the best estimation. The Δη values were also predicted by an approach given by Singh et al. [Indian J Chem 29, 263 (1990)].
Computational Tridimensional Protein Modeling of Cry1Ab19 Toxin from Bacillus thuringiensis BtX-2
( S. Kashyap ),( B. D. Singh ),( D. V. Amla ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.6
We report the computational structural simulation of the Cry1Ab19 toxin molecule from B. thuringiensis BtX-2 based on the structure of Cry1Aa1 deduced by x-ray diffraction. Validation results showed that 93.5% of modeled residues are folded in a favorable orientation with a total energy Z-score of -8.32, and the constructed model has an RMSD of only 1.13A. The major differences in the presented model are longer loop lengths and shortened sheet components. The overall result supports the hierarchical three-domain structural hypothesis of Cry toxins and will help in better understanding the structural variation within the Cry toxin family along with facilitating the design of domain-swapping experiments aimed at improving the toxicity of native toxins.