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- 저자 : Deepak Tiwari (검색결과 4 건)
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Deepak Tiwari,Simarjot Kaur,Haripada Bhunia,Pramod K. Bajpai 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-
Carbon dioxide capture needs development of cost effective CO2 capture technologies. This paper describes oxygen enriched nanostructured carbons synthesized from nanocasting technique using mesoporous silica as template and resorcinol-formaldehyde as precursor. Carbonization at various temperatures (600 °C–800 °C) was carried out to develop range of carbon adsorbents. Thorough characterization of textural, surface and chemical properties was carried out on prepared carbons and evaluated for CO2 capture performance using thermogravimetric analyser under dynamic conditions. Highest dynamic CO2 uptake capacity was reported to be 1.5 mmol g−1 by SRF-700 at 30 °C in 100% pure CO2. The CO2 uptake performance of the prepared carbons is affected by both the textural properties and surface chemistry. Four adsorption–desorption cycles established the material with complete stability and regenerability. Fractional order kinetic model completely described CO2 adsorption on prepared carbons. Thermodynamic parameter values suggested spontaneous, random and exothermic nature of the process. Energetically heterogeneous surface of adsorbent was confirmed by best fitting of Temkin isotherm and random pattern of isosteric heat of adsorption with surface coverage. Approximately, 1.82 MJ per kg CO2 thermal energy is required for desorption process.
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( Ritika Rampal ),( Saurabh Kedia ),( Mohamad Nahidul Wari ),( Deepak Madhu ),( Amit Kumar Singh ),( Veena Tiwari ),( V. Pratap Mouli ),( Srikant Mohta ),( Govind Makharia ),( Vineet Ahuja ) 대한장연구학회 2021 Intestinal Research Vol.19 No.2
Background/Aims: Crohn’s disease (CD) and intestinal tuberculosis (ITB) remain “difficult-to-differentiate” diseases. We have previously documented peripheral blood frequency of CD4<sup>+</sup>CD25<sup>+</sup>FOXP3<sup>+</sup> T-regulatory cells (Treg) as a biomarker to differ entiate CD and ITB. We tried to validate these results in a larger cohort of CD and ITB patients. Methods: Seventy treatment naïve patients of CD (n=23) and ITB (n=47) (diagnosed by standard criteria) were recruited prospectively from October 2016 to May 2017. Patients with history of antitubercular therapy in the past were excluded. The frequency of Treg cells in periph eral blood was determined by flow cytometry, and compared between CD and ITB patients. Results: Similar to our previous study, frequency of Treg cells in peripheral blood was significantly increased in ITB as compared to CD patients (40.9 [inter quartile range, 33-50] vs. 24.9 [interquartile range, 14.4-29.6], P< 0.001). Further, the receiver operating characteristics curve also showed good diagnostic accuracy with an area under the curve (AUC) of 0.77 (95% confidence interval, 0.65-0.89) and a FOXP3<sup>+</sup> cutoff value of >31.3% had a sensitivity and specificity of 83% and 82.6% respectively, to differentiate ITB from CD. Even for the indeterminate cases (n=33), Treg cell frequency had similar diagnostic accuracy with an AUC of 0.85 (95% confi dence interval, 0.68-0.95) and a cutoff of 32.37% had sensitivity and specificity of 87% and 95% respectively, to differentiate ITB from CD. Conclusions: The current findings validate that the increased frequency of CD4<sup>+</sup>CD25<sup>+</sup>FOXP3<sup>+</sup> Treg in the peripheral blood can be used as a biomarker with high diagnostic accuracy to differentiate ITB from CD. (Intest Res 2021;19:232-238)
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Usha Mina,S.D. Singh,B. Singh,Deepak Singh,S. Tiwari,Pranav Kumar 한국작물학회 2019 Journal of crop science and biotechnology Vol.22 No.3
Wheat productivity declines under agro-ecosystems and areas exposed to aerosols due to decline in quality and quantity of solar radiation. Identification of low light-tolerant wheat varieties (Triticum sps.) will help in enhancing the sustainability and productivity of the agroforestry systems as well as areas exposed to aerosol pollution. The field study was conducted to assess the effects of low intensity solar radiation (LR) on 20 wheat varieties in terms of growth, stay green, gaseous exchange, yield attributes, and tolerance indices. Results indicate the increase in plant height and leaf area, reduction in photosynthesis (Pn), stomatal conductance (gs), and transpiration (Tr) in all the varieties grown under LR compared to normal radiation. The varieties, K68 and HD2643, exhibited maximum stay green compared to other varieties. LR caused reduction in biological (35%) and economic (46%) yield of wheat. Among the indices, mean productivity (MP), geometric mean (GM), stress tolerance index (STI), and yield index (YI) were positively correlated with grain yield under LR (Ys) and NR (Yp). Cluster analysis indicated that varieties-HD2643, K68, Kalyansona, and C306 varieties were most LR tolerant, while DL1266-1, DL1266-2, and Moti were moderately tolerant and rest of the varieties exhibited LR susceptibility.
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Usha Mina,S.D. Singh,B. Singh,S. Tiwari,Deepak Singh,Pranav Kumar 한국작물학회 2018 Journal of crop science and biotechnology Vol.21 No.4
Wheat productivity declines under agro-ecosystems and areas exposed to aerosols due to decline in quality and quantity of solar radiation. Identification of low light-tolerant wheat varieties (Triticum sps.) will help in enhancing the sustainability and productivity of the agroforestry systems as well as areas exposed to aerosol pollution. The field study was conducted to assess the effects of low intensity solar radiation (LR) on 20 wheat varieties in terms of growth, stay green, gaseous exchange, yield attributes, and tolerance indices. Results indicate the increase in plant height and leaf area, reduction in photosynthesis (Pn), stomatal conductance (gs), and transpiration (Tr) in all the varieties grown under LR compared to normal radiation. The varieties, K68 and HD2643, exhibited maximum stay green compared to other varieties. LR caused reduction in biological (35%) and economic (46%) yield of wheat. Among the indices, mean productivity (MP), geometric mean (GM), stress tolerance index (STI), and yield index (YI) were positively correlated (P ≤ 0.05) with grain yield under LR (Ys) and NR (Yp). Cluster analysis indicated that varieties – HD2643, K68, Kalyansona, and C306 varieties were most LR tolerant, while DL1266-1, DL1266-2, and Moti were moderately tolerant and rest of the varieties exhibited LR susceptibility.
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