The onset of ferromagnetic convection in a micropolar ferromagnetic fluid layer heated from below in the presence of a uniform applied vertical magnetic field has been investigated. The rigid-isothermal boundaries of ...The onset of ferromagnetic convection in a micropolar ferromagnetic fluid layer heated from below in the presence of a uniform applied vertical magnetic field has been investigated. The rigid-isothermal boundaries of the fluid layer are considered to be either paramagnetic or ferromagnetic and the eigenvalue problem is solved numerically using the Galerkin method. It is noted that the paramagnetic boundaries with large magnetic susceptibility χ delays the onset of ferromagnetic convection the most when compared to very low magnetic susceptibility as well as ferromagnetic boundaries. Increase in the value of magnetic parameter M1 and spin diffusion (couple stress) parameter N3 is to hasten, while increase in the value of coupling parameter N1 and micropolar heat conduction parameter N5 is to delay the onset of ferromagnetic convection. Further, increase in the value of M1, N1, N5 and χ as well as decrease in N3 is to diminish the size of convection cells.展开更多
Objective:To compare the antioxidant and anti-genotoxic properties of Alpinia(A.)galanga,Curcuma(C.)amada,and C.caesia.Methods:Cytotoxicity of ethanolic extracts of A.galanga,C.amada,and C.caesia at selected doses was...Objective:To compare the antioxidant and anti-genotoxic properties of Alpinia(A.)galanga,Curcuma(C.)amada,and C.caesia.Methods:Cytotoxicity of ethanolic extracts of A.galanga,C.amada,and C.caesia at selected doses was evaluated by trypan blue,MTT,and flow cytometry-based assays.Genotoxicity and anti-genotoxicity(against methyl methanesulfonate,35μM and H2O2,250μM)of these plants were studied by comet assay in human lymphocytes in vitro.Furthermore,DPPH,ABTS,FRAP,lipid peroxidation,and hydroxyl radical scavenging assays were performed to study the antioxidant potentials of the plants.Finally,anti-genotoxic potential of C.amada was validated in Swiss albino mice using comet assay.Phytochemical composition of C.amada was determined by GC/MS and HPLC.Results:The selected doses(2.5,5,and 10μg/mL)of A.galanga,C.amada,and C.caesia were non-toxic by cytotoxicity tests.All three ethanolic extracts of plant rhizomes demonstrated antioxidant and anti-genotoxic properties against methyl methanesulfonate-and H2O2-induced oxidative stress in human peripheral blood lymphocytes in vitro.Multivariate analysis revealed that various antioxidant properties of these extracts in DPPH,ABTS,and FRAP assays were strongly correlated with their total phenolic constituents.C.amada extract conferred protection against cyclophosphamide-induced DNA damage in the bone marrow cells of mice and DNA damage was significantly inhibited by 2.5 mg/kg C.amada extract.Conclusions:C.amada is rich in potentially bioactive molecules and exhibits potent antioxidant activities.Its anti-genotoxicity against cyclophosphamide-induced oxidative stress is also confirmed in this study.展开更多
Objective:To evaluate the dose and duration dependent cytotoxicity of aroclor 1254 on mice testis.Methods: The study tests the hypothesis that in vivo exposure of very low dose aroclor 1254, comparable to that of poss...Objective:To evaluate the dose and duration dependent cytotoxicity of aroclor 1254 on mice testis.Methods: The study tests the hypothesis that in vivo exposure of very low dose aroclor 1254, comparable to that of possible human exposure from different environmental sources, will provoke dose and duration dependent histological damage in the mice testis. Male mice were orally administered with the two doses 0.1 and 1 mg/kg b.w /d. of aroclor 1254 for 7, 14, 21 and 28 days.Results:Results showed the degenerative changes in the testis of mice, namely, atrophied seminiferous tubules, expanded space in interstitial and necrosis in the germinal epithelial cells of seminiferous tubules, of the seminiferous tubules and deceleration of spermatogenesis.Conclusions: Therefore, the results of the present study suggested that the sub-acute exposure of very low doses of aroclor 1254, can subsequently mediate the cytoskeleton dysfunction in the testis of mice.展开更多
The genus Saraca L.(Leguminosae)is a universal panacea in herbal medicine.The present study investigates the comparative pollen morphology of four species of Saraca viz.S.asoca(Roxb.)de Wilde,S.declinata(Jack)Miq.,S.i...The genus Saraca L.(Leguminosae)is a universal panacea in herbal medicine.The present study investigates the comparative pollen morphology of four species of Saraca viz.S.asoca(Roxb.)de Wilde,S.declinata(Jack)Miq.,S.indica L.,and S.thaipingensis Cantley ex Prain growing in India to reveal differences of their pollen structures to aid taxonomic and evolutionary values.The detailed morphology and surface structure of pollen grains were studied and described using light microscopy and scanning electron microscopy.The pollen grains of Saraca showed isopolar,para-syncolporate,tricolporate,with radially symmetric,prolate and prolate-spheroidal structure.The surface of pollen of S.indica is rugulate with large lirae but in S.declinata,the surface is micro-rugulate to vermiculate with relatively thin lirae and that of S.thaipingensis is indistinct as the psilate surface with a frequent protuberance and fewer perforations were observed along with the gemmae like structure.Exine ornamentation helped to separate S.indica and S.asoca.Exine thickness varies from 3-4μm.Presence of protuberance and exine thickness varies among individuals of the species spread over different locations.Present work also provides a unique palynological identity and interrelationship of these four species based on cluster analysis taking 23 pollen characters with the help of statistical method like the plotting of ternary graph.Ternary plots also helped to calculate the level of plasticity of each character in the intra-and inter-specific level.展开更多
The paper discusses assessment of various chemical constituents present in groundwater besides morphology, and land form characteristics of twin micro-watersheds (viz., Melekote and Rajaghatta) Dodballapur Taluk, (Kar...The paper discusses assessment of various chemical constituents present in groundwater besides morphology, and land form characteristics of twin micro-watersheds (viz., Melekote and Rajaghatta) Dodballapur Taluk, (Karnataka) coming under semi-arid climatic zone. Farmers who are mainly depending on agricultural yields for their living are disappointed due to vagaries of monsoons and undependable rainfall. This is particularly so in arid and semi-arid regions. These regions suffer from water scarcity, soil degradation, low crop yield, high soil erosion and gradual depletion of soil fertility. All these factors culminate in planning for conservation and storage of water in small watersheds for future needs, i.e., during drought conditions. In many areas, it is observed that the water table levels are declining resulting in problems of increased concentration of solutes and deterioration of groundwater quality. All aspects of hydrological studies are covered in relation to watershed management in order to formulate strategies for sustainable agricultural development. Morphometry, landform and topography play an important role in understanding the hydrological response of any watershed. Quantitative morphometric analysis has been carried out on the watershed along with landform and topographical study.展开更多
Under the effects of electric field and chemical reaction, the problem of dispersion of aerosols in a poorly conducting fluid in a channel is solved analytically using the mixture theory together with a regular pertur...Under the effects of electric field and chemical reaction, the problem of dispersion of aerosols in a poorly conducting fluid in a channel is solved analytically using the mixture theory together with a regular perturbation technique. It is shown that the aerosols are dispersed relative to a plane moving with the mean speed of atmospheric fluid as well as the mean speed of agglomeration of aerosol with a relative diffusion coefficient, called the Taylor dispersion coefficient. This coefficient is numerically computed and the results reveal that it increases with an increase in the electric number, but decreases with increasing porous parameter. The physical explanations for the phenomena are given in this article.展开更多
文摘The onset of ferromagnetic convection in a micropolar ferromagnetic fluid layer heated from below in the presence of a uniform applied vertical magnetic field has been investigated. The rigid-isothermal boundaries of the fluid layer are considered to be either paramagnetic or ferromagnetic and the eigenvalue problem is solved numerically using the Galerkin method. It is noted that the paramagnetic boundaries with large magnetic susceptibility χ delays the onset of ferromagnetic convection the most when compared to very low magnetic susceptibility as well as ferromagnetic boundaries. Increase in the value of magnetic parameter M1 and spin diffusion (couple stress) parameter N3 is to hasten, while increase in the value of coupling parameter N1 and micropolar heat conduction parameter N5 is to delay the onset of ferromagnetic convection. Further, increase in the value of M1, N1, N5 and χ as well as decrease in N3 is to diminish the size of convection cells.
文摘Objective:To compare the antioxidant and anti-genotoxic properties of Alpinia(A.)galanga,Curcuma(C.)amada,and C.caesia.Methods:Cytotoxicity of ethanolic extracts of A.galanga,C.amada,and C.caesia at selected doses was evaluated by trypan blue,MTT,and flow cytometry-based assays.Genotoxicity and anti-genotoxicity(against methyl methanesulfonate,35μM and H2O2,250μM)of these plants were studied by comet assay in human lymphocytes in vitro.Furthermore,DPPH,ABTS,FRAP,lipid peroxidation,and hydroxyl radical scavenging assays were performed to study the antioxidant potentials of the plants.Finally,anti-genotoxic potential of C.amada was validated in Swiss albino mice using comet assay.Phytochemical composition of C.amada was determined by GC/MS and HPLC.Results:The selected doses(2.5,5,and 10μg/mL)of A.galanga,C.amada,and C.caesia were non-toxic by cytotoxicity tests.All three ethanolic extracts of plant rhizomes demonstrated antioxidant and anti-genotoxic properties against methyl methanesulfonate-and H2O2-induced oxidative stress in human peripheral blood lymphocytes in vitro.Multivariate analysis revealed that various antioxidant properties of these extracts in DPPH,ABTS,and FRAP assays were strongly correlated with their total phenolic constituents.C.amada extract conferred protection against cyclophosphamide-induced DNA damage in the bone marrow cells of mice and DNA damage was significantly inhibited by 2.5 mg/kg C.amada extract.Conclusions:C.amada is rich in potentially bioactive molecules and exhibits potent antioxidant activities.Its anti-genotoxicity against cyclophosphamide-induced oxidative stress is also confirmed in this study.
文摘Objective:To evaluate the dose and duration dependent cytotoxicity of aroclor 1254 on mice testis.Methods: The study tests the hypothesis that in vivo exposure of very low dose aroclor 1254, comparable to that of possible human exposure from different environmental sources, will provoke dose and duration dependent histological damage in the mice testis. Male mice were orally administered with the two doses 0.1 and 1 mg/kg b.w /d. of aroclor 1254 for 7, 14, 21 and 28 days.Results:Results showed the degenerative changes in the testis of mice, namely, atrophied seminiferous tubules, expanded space in interstitial and necrosis in the germinal epithelial cells of seminiferous tubules, of the seminiferous tubules and deceleration of spermatogenesis.Conclusions: Therefore, the results of the present study suggested that the sub-acute exposure of very low doses of aroclor 1254, can subsequently mediate the cytoskeleton dysfunction in the testis of mice.
文摘The genus Saraca L.(Leguminosae)is a universal panacea in herbal medicine.The present study investigates the comparative pollen morphology of four species of Saraca viz.S.asoca(Roxb.)de Wilde,S.declinata(Jack)Miq.,S.indica L.,and S.thaipingensis Cantley ex Prain growing in India to reveal differences of their pollen structures to aid taxonomic and evolutionary values.The detailed morphology and surface structure of pollen grains were studied and described using light microscopy and scanning electron microscopy.The pollen grains of Saraca showed isopolar,para-syncolporate,tricolporate,with radially symmetric,prolate and prolate-spheroidal structure.The surface of pollen of S.indica is rugulate with large lirae but in S.declinata,the surface is micro-rugulate to vermiculate with relatively thin lirae and that of S.thaipingensis is indistinct as the psilate surface with a frequent protuberance and fewer perforations were observed along with the gemmae like structure.Exine ornamentation helped to separate S.indica and S.asoca.Exine thickness varies from 3-4μm.Presence of protuberance and exine thickness varies among individuals of the species spread over different locations.Present work also provides a unique palynological identity and interrelationship of these four species based on cluster analysis taking 23 pollen characters with the help of statistical method like the plotting of ternary graph.Ternary plots also helped to calculate the level of plasticity of each character in the intra-and inter-specific level.
文摘The paper discusses assessment of various chemical constituents present in groundwater besides morphology, and land form characteristics of twin micro-watersheds (viz., Melekote and Rajaghatta) Dodballapur Taluk, (Karnataka) coming under semi-arid climatic zone. Farmers who are mainly depending on agricultural yields for their living are disappointed due to vagaries of monsoons and undependable rainfall. This is particularly so in arid and semi-arid regions. These regions suffer from water scarcity, soil degradation, low crop yield, high soil erosion and gradual depletion of soil fertility. All these factors culminate in planning for conservation and storage of water in small watersheds for future needs, i.e., during drought conditions. In many areas, it is observed that the water table levels are declining resulting in problems of increased concentration of solutes and deterioration of groundwater quality. All aspects of hydrological studies are covered in relation to watershed management in order to formulate strategies for sustainable agricultural development. Morphometry, landform and topography play an important role in understanding the hydrological response of any watershed. Quantitative morphometric analysis has been carried out on the watershed along with landform and topographical study.
基金Project supported by the Department of Science of Technology of India (Grant No. SR/S4-AS-237/2004-05)the Research Grants Council of the Hong Kong Special Administrative Region, China, (Grant Nos. HKU 715609E, HKU 715510E)supported by the University of Hong Kong through the Seed Funding Programme for Basic Research (Grant No. 200911159024)
文摘Under the effects of electric field and chemical reaction, the problem of dispersion of aerosols in a poorly conducting fluid in a channel is solved analytically using the mixture theory together with a regular perturbation technique. It is shown that the aerosols are dispersed relative to a plane moving with the mean speed of atmospheric fluid as well as the mean speed of agglomeration of aerosol with a relative diffusion coefficient, called the Taylor dispersion coefficient. This coefficient is numerically computed and the results reveal that it increases with an increase in the electric number, but decreases with increasing porous parameter. The physical explanations for the phenomena are given in this article.
