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排序方式: 共有189条查询结果,搜索用时 31 毫秒
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Pandit DN Ghosh TK 《Journal of environmental biology / Academy of Environmental Biology, India》2007,28(1):141-143
The present work reports oxygen uptake in relation to group size in the juveniles (body weight: 0.70 to 1.30 g) of a climbing perch, Anabas testudineus (Bloch). The experiments were conducted at 21.5 +/- 1.0 degrees C using a cylindrical glass respirometer having continuous water flow system. With an increase in the number of fish at an interval of 5 from 5 to 40 in each fourth subsequent experiment, the weight specific aquatic oxygen uptake of a fish decreased from 0.192 +/- 0.030 to 0.800 +/- 0.006 ml O2 x g(-1)x(h(-1). When compared with a controlled fish, there was a reduction of 27.80% in the oxygen uptake in a group of 5 but 58.39% in a group of 40. A negative and significant correlation (r = 0.8411, p < 0.01) was calculated between oxygen uptake and group size of fishes. The investigation showed that probably due to shoaling behaviour, the aquatic oxygen uptake in the juveniles of A. testudineus always remained high in controlled fish or a fish in isolation than when they were in a group. 相似文献
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Ghosh Sudipta Debsarkar Anupam Dutta Amit Bhandary Subhrajyoti Chopra Deepak 《Environment, Development and Sustainability》2021,23(9):13087-13112
Environment, Development and Sustainability - Arsenic (As) in groundwater has become a worldwide concern due to its high toxicity as it is classified as a potent carcinogen, when exposed to... 相似文献
66.
Johannes Breit Satoru Komatsu Shinji Kaneko Partha Pratim Ghosh 《Environment, Development and Sustainability》2016,18(1):73-94
This paper investigates household preferences regarding an improved supply of electricity in rural Bangladesh, where the expansion of stable electricity is an urgent policy issue. The paper examines household preferences regarding reductions in the frequency and duration of power outages. It also examines prior notification mechanisms that do not necessarily provide an increased supply of electricity but that allow households to prepare for potential power failures. A questionnaire survey designed as a choice experiment was applied to households to elicit preferences. The econometric analysis reveals that villagers prefer a reduction in both the frequency and duration of power outages and a 1-day prior notification of power outages. There are slight disparities in preferences according to the season and the timing of improvements (e.g., summer or winter and all day or peak hours). Thus, the present study may be beneficial for policymakers when considering the provision of electricity supply improvements in rural areas in exchange for slight increases in electricity tariffs. 相似文献
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Minghui Yang Seokjoon Kwon Yordan Kostov Avraham Rasooly Govind Rao Upal Ghosh 《Environmental Chemistry Letters》2011,9(2):235-241
Single-wall carbon nanotubes (CNT) are one of the most attractive engineered nanomaterials due to their unique electrical,
mechanical and thermal properties, and potential use in a variety of commercial products. Due to their small size, CNT could
become easily airborne and reach the various environmental compartments and eventually the food chain and humans. However,
the environmental fate processes and health impacts of CNT are not clear. This study investigated a method for the quantitative
measurement of carbon nanotube (CNT) in natural media such soil and benthic organism tissues. Fluorescence dye Nile blue was
used for noncovalent labeling of CNT to enable their fluorescence detection. Labeled nanotubes were successfully detected
in soil samples as well as in worm tissue. We were also able to detect the presence of labeled carbon nanotubes in worms exposed
for 1 week to CNT-laden soil, which indicates CNT may transfer through environmental food web. The method allows for laboratory
measurements of CNT mass transfer and partitioning into various environmental systems. 相似文献
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K. Pahan J. Chaudhuri D. K. Ghosh R. Gachhui S. Ray A. Mandal 《The Environmentalist》1996,16(3):179-185
Summary A broad-spectrum mercury-resistant bacterial strain was isolated from contaminated water and was identified as Bacillus pasteurii strain DR2. It could volatilize Hg-compounds including organomercurials from its growth media. It utilized several aromatic compounds as a sole source of carbon. The bacterial strain eliminated HgCl2 from sterile river water and the presence of benzene, toluene, naphthalene and nitrobenzene at 1 mM concentration in the system increased the rate of mercury volatilization, the volatilization rate being highest with benzene. When 1.7×107 cells of this bacterial strain were added per ml of non-sterile water the bacterial strain volatilized more than 90 percent of mercury from mercuric chloride and organo-mercurials like PMA, thiomersol and methoxy ethyl mercuric chloride (MEMC). In the absence of this bacterial strain the volatilization of PMA and MEMC due to the presence of other Hg-resistant organisms in nonsterile polluted water ranged between 20–25 percent and of HgCl2 was about 40 percent. However, in the presence of B. pasteurii DR2 volatilization of these Hg-compounds from non-sterile water increased by 20–40 percent. In the presence of 1 mM benzene the rate of mercury volatilization was even higher. In all the cases the rate of volatilization was higher in the first seven days than in the next seven days.Professor A. Mandal, MSc, PhD is Head of the Department of Biochemistry at the University College of Science, 35 Ballygunge Circular Road, Calcutta 700019, to whom correspondence should be addressed. His co-workers are Dr K. Pahan, Postdoctoral Associate, Department of Cell Biology and Paediatrics, Medical University of South Carolina, USA; Dr J. Chaudhuri, Senior Lecturer, Department of Molecular Biology, BKC College, Calcutta, India; Dr D.K. Ghosh, Postdoctoral Associate, Department of Biochemistry, University College of Science, Calcutta, India; Dr R. Gachhui, Postdoctoral Associate, The Cleveland Clinic Foundation, Cleveland, USA; and Dr S. Ray, Postdoctoral Associate, The Johns Hopkins University School of Hygiene and Public Health, Department of Biochemistry, Baltimore, USA. 相似文献