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61.
Assessment of temporal variation in water quality of some important rivers in middle Gangetic plains, India 总被引:2,自引:0,他引:2
Nipunika Rani Ravindra Kumar Sinha Kriteshwar Prasad Dilip Kumar Kedia 《Environmental monitoring and assessment》2011,174(1-4):401-415
The study explains water quality of three important tributaries of the Ganga River in the middle Gangetic plains in India. Seasonal changes in the water quality of the studied rivers: Gandak, Ghaghra, and Sone were observed. During monsoon, several water quality parameters show considerable changes due to increased runoff from the catchments and other seasonal factors. Multivariate discriminant analysis delineated a few parameters responsible for temporal variation in water quality. Seasonal variation in water quality of the Gandak River was rendered by seven parameters??turbidity, sulfate, pH, phosphate, water temperature, total alkalinity, and sodium, while total alkalinity and water temperature were responsible for seasonal discrimination in water quality of Ghaghra River. Water temperature, turbidity, total dissolved solids, total suspended solids, calcium, and phosphate were important for seasonal discrimination in water quality of Sone River. The seasonal changes in water quality of the rivers were due to seasonal effects and catchment characteristics. The discriminant functions classified most of the cases correctly. 相似文献
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Esterase enzyme was isolated from goat intestine and partially purified to explore whether it can degrade β-cyfluthrin, a synthetic pyrethroid insecticide. The products of the reaction were identified in order to propose its path of degradation to innocuous non-toxic compounds. This is the first report for testing the suitability of such esterase enzyme for degrading a synthetic pyrethroid insecticide. 相似文献
64.
S. Premnath Anindya Sinha Raghavendra Gadagkar 《Behavioral ecology and sociobiology》1996,39(2):125-132
In mature post-emergence colonies of the tropical primitively eusocial polistine wasp Ropalidia marginata, the queen is not a behaviourally dominant individual. Nevertheless, she completely suppresses reproduction by the workers
and becomes the sole egg-layer in the colony. Mechanisms by which a female is able to establish her exclusive reproductive
status in the colony can be investigated by examining dominance-submission relationships and hierarchy formation at particular
stages of the colony cycle when reproductive competition is behaviourally manifest. Observations on the behaviour of R. marginata females (1) during early stages of colony-founding, (2) when potential queens challenge the existing queen, and (3) immediately
after queen replacement show that these wasps use highly aggressive dominance interactions to establish their reproductive
status. Both the frequency and the intensity of dominance behaviours are significantly higher at these stages than those observed
at phases of the colony when there is no apparent reproductive strife. Once her position as the only egg-layer of the colony
has been established, the levels of dominance interactions initiated by the queen decrease and the nature of these interactions
also becomes comparatively milder. Thus, the mechanisms by which a queen establishes her social status in her colony and those
by which she continues to suppress reproduction of her nestmates in the absence of overt physical dominance may be quite different.
Received: 17 November 1995/Accepted after revision: 20 April 1996 相似文献
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Sinha S Mukherji S Dutta J 《Journal of environmental biology / Academy of Environmental Biology, India》2002,23(3):253-257
Effect of different concentrations, viz. 10(-4) M, 5 x 10(-4) M, 10(-3) M and 5 x 10(-3) M of manganese sulphate (MnSO4, 7H2O) on chlorophyll, carotenoid pigment content and photosynthesis of mungbean seedlings was examined Progressive increase in manganese sulphate concentration upto 5 x 10(-3) M brought about a progressive decrease in total chlorophyll and chl a content. Chl b content changed very little by excess manganese treatment. Total carotenoid pigment content decreased considerably in comparison to control with every concentration of manganese sulphate tried here. Hill activity of chloroplasts isolated from leaves of mungbean seedling and rate of photosynthesis in terms of CO2 uptake showed progressive reduction along with the increase in concentration of the manganese. 相似文献
67.
Lalit K. Sinha 《Journal of the American Water Resources Association》1970,6(2):209-221
Step-IB in the first phase of an “Operational Watershed Model” recently initiated by the Central and Southern Florida Flood Control District for managing its water resources is to compute water surface elevation, spatially and temporally, in the Kissimmee River Basin system of reservoirs, channels and spillways. An approach is based upon the principles of gradually varied flow. Mathematical relationships to compute lake stage as a function of storage, and to compute discharge through the control structures as a function of gate opening and differential head across the structures are developed. Their feasibility for application is clearly demonstrated by the simulated mean daily water surface elevation for a period of two years on the tail side of one typical gated spillway and on the head side of another gated spillway. 相似文献
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Ibrahim Hafeezur Rehman Abhishek Kar Rob Raven Dilip Singh Jitendra Tiwari Rakesh Jha Pramod Kumar Sinha Asim Mirza 《Environmental Science & Policy》2010,13(4):303-311
In most developing countries, at the household level, traditional burning of biomass or use of inefficient technologies for domestic applications like lighting is common, triggering concerns related to fuel or technology switching. The paper focuses on opportunities to promote cleaner energy options through development of value chains delivering improved energy efficiency and access in developing countries. We discuss the example of Uttam Urja, a field project involving the dissemination of photovoltaic lighting technologies in rural areas of India. We focus on the challenges of introducing radical innovations into the residential energy sector in developing countries. For the purpose of this paper the Uttam Urja project is conceptualized as an ‘experiment’ and analysed using the Strategic Niche Management (SNM) framework. The paper emphasizes that to effect socio-technical transitions to clean energy options on the ground, it is desirable to focus on technology customization and innovative financing to cater to the needs and concerns of end users. 相似文献