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排序方式: 共有199条查询结果,搜索用时 765 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
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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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