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Convective stability analysis of a micropolar fluid layer by variational method

Theoretical & Applied Mechanics Letters 2011年第4期1卷 47-52页

作者： joginder s.dhiman Praveen K.sharma Gurdeep singh Department of Mathematics Himachal Pradesh UniversityShimla 171005India

This paper studies Rayleigh-B’enard convection of micropolar fluid layer heated from below with realistic boundary conditions.A specific approach for stability analysis of a convective problem based on variational principle is applied to characterize the Rayleigh number for quite general nature of bounding *** analysis consists of replacing the set of field equations by a variational principle and the expressions for Rayleigh number are then obtained by using trial function satisfying the essential boundary ***,the values of the Rayleigh number for particular cases of large and small values of the microrotation coefficient have been *** effects of wave number and micropolar parameter on the Rayleigh numbers for onset of stationary instability for each possible combination of the bounding surfaces are discussed and illustrated *** present analysis establishes that the nature of bounding surfaces combination and microrotation have significant effect on the onset of convection.

关键词： critical Rayleigh number Rayleigh-B'enard convection micropolar fluid eigenvalue problem variational principle

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On the stationary Convection of Thermohaline Problems of Veronis and stern Types

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Applied Mathematics 2010年第5期1卷 400-405页

作者： joginder s. dhiman Praveen K. sharma Poonam sharma 不详

The stability of thermohaline convection problems of Veronis and stern types for stationary convection is studied for quite general nature of boundaries. It is shown by means of an appropriately chosen linear transformation, that in case of stationary convection the equations describing the eigenvalue problem for thermohaline convection problems are identical to equations describing the eigenvalue problem for classical Bénard convection problem. As a consequence, the values of the critical Rayleigh numbers for the onset of stationary convection in thermohaline convection problems are obtained. Also, necessary conditions for the validity of principle of exchange of stabilities for thermohaline convection problems are derived using variational principle.

关键词： Thermohaline Convection stationary Convection Eigenvalue Problem Principle of Exchange of stabilities Rayleigh Number

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stress Ameliorative Effects of Indole Acetic Acid on Hordeum vulgare L. seedlings subjected to Zinc Toxicity

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Phyton-International Journal of Experimental Botany 2020年第1期89卷 71-86页

作者： Monika sood shanti s.sharma joginder singh Ram Prasad Dhriti Kapoor school of Bioengineering and Biosciences Lovely Professional University PhagwaraPunjab144411India school of Environmental science and Engineering Sun Yat-sen UniversityGuangzhou510006China Department of Botany Mahatma Gandhi Central UniversityMotihariBihar845401India

The heavy metals present in the environment accumulate in the plants and affect their productivity and *** entering the food chain,metals cause several serious health problems in human beings as well as in other *** acetic acid(IAA)is known to act as a signaling molecule between symbiotic association of metal accumulating plants and plant growth promoting rhizobacteria(PGPR).Present study demonstrated a protective role of IAA against surplus Zinc(Zn)-induced toxicity to Hordeum vulgare *** Zn concentrations suppressed the plant growth,caused a reduction in leaf relative water contents(RWC)and elevated free proline and non-protein thiols(NPT)*** treatment also led to enhanced lipid peroxidation(MDA contents)as well as the activity of ascorbate peroxidase(APX),showing the involvement of antioxidative defense mechanism to reduce Zn induced *** oxidase activity was also observed to increase due to Zn *** pretreatment of *** caryopsis could partly revert the Zn-induced toxicity in seedlings.

关键词： Heavy metals phytohormone lipid peroxidation non-protein thiols(NPT) relative water contents(RWC) free proline ascorbate peroxidase(APX) IAA oxidase

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Folate-producing rhizobacteria of Hippophae rhamnoides *** Indian trans-Himalaya low atmospheric zone

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BIOCELL 2021年第2期45卷 387-394页

作者： POOJA BHADRECHA MADHU BALA VIKAs KAUsHIK NAsEEM A.GAUR sIMRANJEET sINGH joginder sINGH MANOJ KUMAR Department of Biotechnology Mangalmay Group of InstitutionsGreater Noida201306India Institute of Nuclear Medicine and Allied sciences Defence Research and Development OrganisationNew Delhi110054India Defence Institute of Bio-Energy Research(DRDO) Haldwani263139India Department of Biotechnology School of Bioengineering and BiosciencesLovely Professional UniversityPhagwara144411India International Centre for Genetic Engineering and Biotechnology(ICGEB) New Delhi110067India Department of Life sciences Central University of JharkhandBrambe835205India

Hippophae rhamnoides *** a plant of immense ethnopharmacological importance and is a known source for various valuable biochemicals and *** production of folate,a vitamin involved in several vital functions,in this plant is rather poorly ***,we investigate the hypothesis that rhizobial bacteria serve the plant in this essential vitamin’s *** strains of Bacillus,Azorhizobium,Frankia,Paenibacillus,Brevibacillus and Pseudomonas,were isolated from the rhizosphere of the *** and LCMs were used to trace the production of intra and extra-cellular folate by representative rhizospheric bacterial strains in *** the seventeen functionally characterized bacterial strains of the plant’s rhizosphere,thirteen produced significant amounts of *** BR5401 produced the maximum amount of folic acid(424μg/mL),and Bacillus GY779 was the only strain capable of producing both intracellular and extra-cellular folic *** Open Reading Frame coding for dihydroneopterin aldolase,an enzyme involved in folate biosynthesis,was found in one of the representative *** experimental findings help us to suggest that the folate synthesized by rhizobial bacteria is transported to the plant,highlighting a significant benefit of coexistence.

关键词： sea buckthorn Rhizosphere Folate HPLC Dihydroneopterin aldolase

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