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Nitin M.,Central Rainfed Upland Rice Research Station Icar | Khalko A.S.,Marwari College | Kumar R.,Center for Biotechnology | Sinha R.,Center for Biotechnology | And 2 more authors.
Ecology, Environment and Conservation | Year: 2013

A Gram-negative aerobic bacterium designated as Pseudomonas mendocina (PC19) was isolated from the soil collected from ICAR Research Complex, Eastern Region, Plandu, Ranchi, Jharkhand (India). Identification was done using 16S rDNA method. It plays important role in bioremediation and growth stimulation in plant. Laboratory assays were done to evaluate the effect of four different organophosphates (malathion, dimethoate, chlorpyrifos, phorate) and biopesticides (biosanjeevani, biosoft, neemta and leaves extract of species Karanj), applied at three different doses separately (RD,2RD,10RD) in soil sample. Study was carried for 40 days at 10 days regular interval. It was observed that maximum population mean observed for Karanj RD at 10 day (2.2 ± 0.62), 20 day (2.26 ± 0.40), 30 day (2.86 ± 0.32) and 40 day (2.86 ± 0.51), while minimum population mean was observed for malathion 10RD at 1 day (0.001 ± 0.001), 10 day (0), 20 day (0), 30 day (0.0003 ± 0.0005) and 40 day (0.0001 ± 0.0001). Statistical analysis was done using one way ANOVA resulted in comparative study between Organophosphates (OP) and Biopesticides (BP) influence on bacterial population with respect to control. OP and BP at RD, 2RD and 10RD concentration was justified by ANOVA resulted variance in bacterial colony growth (F value = 6.08, P value = <.0.0001, d.f. = 24). Copyright © EM International. Source


Mahto D.,Marwari College | Prasad U.,Tnb College | Singh B.K.,TMBU | Singh K.M.,Marwari College
Astrophysics and Space Science | Year: 2013

The present research paper discusses the derivation for the change in entropy of Non-spinning black holes with respect to the change in the radius of event horizon applying the first law of black hole mechanics, with the relation for the change in entropy δS=8πMδM. When the work is further extended with proper operation, the entropy of black hole is obtained almost the same as the Bekenstein-Hawking entropy of black hole. This is the entirely new method to obtain the change in entropy of Non-spinning black holes w.r.t. the radius of event horizon and Hawking entropy of black hole. We have also calculated their values for different types of test non-spinning black holes having masses 5-20M⊙ found in X-ray binaries (Narayan, gr-qc/0506078v1, 2005, 2005). © 2012 Springer Science+Business Media B.V. Source


Mahto D.,Marwari College | Kumari K.,Research Scholar Tmbu | Sah R.K.,Ssv College Kahalgaon | Singh K.M.,Marwari College
Astrophysics and Space Science | Year: 2012

In this research paper, we have derived the formula for both the changes in energy (δE) and entropy (δS) and thereafter calculated the change in entropy (δS) with corresponding change in energy (δE) taking account the first law of the black hole mechanics relating the change in mass M, angular momentum J, horizon area A and charge Q, of a stationary black hole, when it is perturbed, given by formula satisfying in the vacuum as δM = k/8π δA + ΩδJ - υδQ, specially for Non-spinning black holes. © 2011 Springer Science+Business Media B.V. Source


Mahto D.P.,Marwari College | Nand Mehta R.,Tilka Manjhi Bhagalpur University | Prasad U.,Tnbcollege | Murari Singh K.,Marwari College | John M.S.H.,Marwari College Bhagalpur
Advanced Materials Research | Year: 2013

The present paper derives an expression for internal energy of the Non-spinning black holes using first law of black hole thermodynamics and calculates their values of different test Nonspinning holes existing in X-ray binaries (XRBs) and Active Galactic Nuclei (AGN). © (2013)Trans Tech Publications,Switzerland. Source


Mehta R.N.,Tilka Manjhi Bhagalpur University | Pant N.,Department of National Defence | Mahto D.,Marwari College | Jha J.S.,Tilka Manjhi Bhagalpur University
Astrophysics and Space Science | Year: 2013

We present a well behaved class of charged analogue of M. C. Durgapal (J. Phys. A, Math. Gen. 15:2637, 1982) solution. This solution describes charged fluid balls with positively finite central pressure, positively finite central density; their ratio is less than one and causality condition is obeyed at the centre. The outmarch of pressure, density, pressure-density ratio and the adiabatic speed of sound is monotonically decreasing, however, the electric intensity is monotonically increasing in nature. This solution gives us wide range of parameter for every positive value of n for which the solution is well behaved hence, suitable for modeling of super dense stars. Keeping in view of well behaved nature of this solution, one new class of solution is being studied extensively. Moreover, this class of solution gives us wide range of constant K (0≤K≤2. 2) for which the solution is well behaved hence, suitable for modeling of super dense stars like strange quark stars, neutron stars and pulsars. For this class of solution the mass of a star is maximized with all degree of suitability, compatible with quark stars, neutron stars and pulsars. By assuming the surface density ρb=2×1014 g/cm3 (like, Brecher and Capocaso, Nature 259:377, 1976), corresponding to K=0 with X=0. 235, the resulting well behaved model has the mass M=4. 03MΘ, radius rb=19. 53 km and moment of inertia I=1. 213×1046 g cm2; for K=1. 5 with X=0. 235, the resulting well behaved model has the mass M=4. 43MΘ, radius rb=18. 04 km and moment of inertia I=1. 136×1046 g cm2; for K=2. 2 with X=0. 235, the resulting well behaved model has the mass M=4. 56MΘ, radius rb=17. 30 km and moment of inertia I=1. 076×1046 g cm2. These values of masses and moment of inertia are found to be consistent with the crab pulsars. © 2012 Springer Science+Business Media Dordrecht. Source

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