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RISS 인기검색어
- 검색키워드
- 저자 : Alok Sinha (검색결과 5 건)
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Hawking decay and thermodynamic transformation of a black hole: two examples
Sinha Aloke Kumar 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.4
The criterion for thermodynamic stability of rotating electrically charged quantum black holes was already derived by us. They appeared as a collection of inequalities connecting second-order derivatives of the black hole mass with respect to its horizon area, electric charge and angular momentum. We got similar results when this analysis was extended to black holes in arbitrary dimensional spacetime with any number of parameters that determine the mass of the black hole. Many black holes were shown to satisfy some of the stability criteria in certain regions of parameter space, but not all together. They are known as “Quasi Stable” black holes. Quasi stability restricts the accessibility of parameter space; hence, it creates bounds on various parameters of the quasi-stable black holes. They, although decaying under Hawking radiation, possess bounded fluctuations in certain regions of their accessibility for some of their parameters. We here consider Kerr–Newman and Kerr–Sen black holes as examples of two quasi-stable black holes. Their fluctuations are shown to be related to the bounds in parameter space. We also study the decay rate in various regions of their parameter spaces. We conclude that they transform to different kinds of black holes during their Hawking decay.
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Alok Sinha,Raja Kumar 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
The effect of widely used dye-bath additives, namely sodium chloride, ammonium sulfate, urea, acetic acid and citric acid, on the reductive removal of azo dye AR73 by zero valent iron was investigated. Na+ induced ‘salting out’ effect on the dye molecules complemented with Cl− induced pitting corrosion of ZVI surface led to improved dye removal rate with increasing NaCl concentration. ‘Salting out’ effect of (NH4)2SO4 together with enhanced iron corrosion by aggressive SO4 2− and reducing effect of ‘sulfate green rust’ benefitted the reaction rates. However, beyond 1,000mg/L (NH4)2SO4 concentration, complex formation of NH4 + and SO4 2− with iron oxides compromised ZVI reactivity. Urea inhibited the reaction by its chaotropic effect on the dye solution and also by wrapping the ZVI surface. Enhanced iron corrosion by organic acids improved the reaction rates. The dye removal followed biphasic kinetics with initial rapid phase, when more than 95% dye removal was observed in all the studies, followed by a slow phase. The experimental data could be well evaluated using biphasic rate equation (R2>0.995 in all the cases). Highest dye removal rate of 0.900 min−1 was achieved at pH 2 with all the additives amended. AR73 removal could be modelled using biphasic model considering the individual effect of each additive. Rapid dye reduction capability at varied solution composition makes ZVI more advantageous and promising for wastewater treatment.
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Rhythmic Expression of Mitogen Activated Protein Kinase Activity in Rice
Kudupudi Prabhakara Rao,Gubbala Vani,Kundan Kumar,Alok Krishna Sinha 한국분자세포생물학회 2009 Molecules and cells Vol.28 No.5
Mitogen activated protein kinase (MAPK) are known to get activated during various stress signals and transduce the message from the cell membrane to the nucleus for ap-propriate cellular reorganization. Though, a certain basal activity of MAPK is often observed in the control plants. Prolonged exposure of rice plants to lowered or elevated temperature exhibited a rhythm in the activation of MAPKs. We analyzed existence of a possible endogenous rhythm in the activity of MAPKs in rice plants. The plants growing at constant temperature entrained in 16/8 h day-night cycle showed diurnal rhythm in activity. When the activation of MAPK was tested under continuous conditions by shifting plants to continuous darkness for a period of 72 h, the periodic rhythm persisted and followed a circadian pattern. Analysis of the transcripts of group A, B and C members of MAPKs under above conditions by quantitative real time PCR revealed that the members of group C exhibit periodic rhythm. Our data indicates that the MAP kinase activity in rice follows rhythmic expression in a circadian manner.
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Hyun, Tae-Kyung,Kumar, Kundan,Rao, Kudupudi Prabhakara,Sinha, Alok Krishna,Roitsch, Thomas The Korean Society of Plant Biotechnology 2011 Plant biotechnology reports Vol.5 No.1
Tocopherols belong to the plant-derived poly phenolic compounds known for antioxidant functions in plants and animals. Activation of mitogen-activated protein kinases (MAPK) is a common reaction of plant cells in defense-related signal transduction pathways. We report a novel non-antioxidant function of ${\alpha}$-tocopherol in higher plants linking the physiological role of tocopherol with stress signalling pathways. Pre-incubation of a low concentration of $50{\mu}M$ ${\alpha}$-tocopherol negatively interferes with MAPK activation in elicitor-treated tobacco BY2 suspension culture cells and wounded tobacco leaves, whereas pre-incubated BY2 cells with ${\alpha}$-tocopherol phosphate did not show the inhibitory effect on stimuli-induced MAPK activation. The decreased MAPK activity was neither due to a direct inhibitory effect of ${\alpha}$-tocopherol nor due to the induction of an inhibitory or inactivating activity directly affecting MAPK activity. The data support that the target of ${\alpha}$-tocopherol negatively regulates an upstream component of the signaling pathways that leads to stress dependent MAPK activation.
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Influence of abiotic factors on seasonal incidence of pests of tasar Silkworm Antheraea mylitta D.
Siddaiah, Aruna A.,Prasad, Rajendra,Rai, Suresh,Dubey, Omprakash,Satpaty, Subrat,Sinha, Ravibhushan,Prsad, Suraj,Sahay, Alok Korean Society of Sericultural Science 2014 International Journal of Industrial Entomology Vol.29 No.1
Rearing of tropical tasar silkworm, Antheraea mylitta Drury is mainly conducted in outdoor on Terminalia tomentosa W. & A. a nature grown primary host plant available in forest and also on raised primary host plant Terminalia arjuna Bedd. Temperature, relative humidity and rainfall are the main environmental factors for occurrence of pests (parasites and predators) of tasar silkworm during I, II and III crop rearing in the tropical tasar producing zones. The present study was aimed to study the influence of abiotic factors on prevalence of tasar silkworm pests. The study was conducted at different agro-climatic regions viz., Central Tasar Research &Training Institute, Ranchi, Jharkhand, Regional Extension Centre, Katghora, Chattisgarh and Regional Extension Centre, Hatgamaria during 2010-13 covering 3 seed crop and 6 commercial crops. Data on incidence of tropical tasar silkworm endo-parasitoids like Uzi Fly, Blepharipa zebina Walker and Ichneumon fly (Yellow Fly), Xathopimpla pedator, Fabricius and Predators such as Stink bug (Eocanthecona furcellata Wolf), Reduviid bug (Sycanus collaris Fabricius) and Wasp (Vespa orientalis Linnaeus) was recorded Weekly. The meteorological data was collected daily. Data was collected from 4 different agro-climatic zones of tasar growing areas. Analysis of the data revealed a significant negative correlation between abiotic factors and incidence of ichneumon fly and uzi fly. Based on the 3 years data on prevalence of pests region-wise pest calendars and prediction models were developed.
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