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Effect of sodium arsenite on adrenocortical activity in immature female rats: evidence of dose dependent response 总被引:1,自引:0,他引:1
ntroductionArsenic,ametalloid,isanonessentialtraceelement,hasbeenclaimedtobeofclinicalbenefitinthetreatmentofsyphilis,amoebiasisandothertropicaldiseases(Klaassen,1990;Kowaguchi,1981).Besideitsclinicalimportance,arsenicisreportedtobeanimportantwaterpo… 相似文献
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Modeling perceived collision risk in port water navigation 总被引:1,自引:0,他引:1
An increase in the likelihood of navigational collisions in port waters has put focus on the collision avoidance process in port traffic safety. The most widely used on-board collision-avoidance system is the automatic radar plotting aid which is a passive warning system that triggers an alert based on the pilot’s pre-defined indicators of distance and time proximities at the closest point of approaches in encounters with nearby vessels. To better help pilot in decision making in close quarter situations, collision risk should be considered as a continuous monotonic function of the proximities and risk perception should be considered probabilistically. This paper derives an ordered probit regression model to study perceived collision risks. To illustrate the procedure, the risks perceived by Singapore port pilots were obtained to calibrate the regression model. The results demonstrate that a framework based on the probabilistic risk assessment model can be used to give a better understanding of collision risk and to define a more appropriate level of evasive actions. 相似文献
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S. Adhikari Biplab Sarkar Amita Chattopadhyay D.N. Chattopadhyay S.K. Sarkar S. Ayyappan 《毒物与环境化学》2013,95(3):457-465
The effect of carbofuran, a carbamate pesticide, on the breeding performance of the freshwater fish Labeo rohita (Hamilton) has been investigated in the present study. Breeding of L. rohita was conducted after treatment with three sublethal concentrations, i.e. 0.06, 0.15 and 0.30 mg L?1 of carbofuran for 96 h. The present investigation showed that the number of total eggs and total amount of eggs (litre per kg body weight) decreased significantly (p < 0.01) at all concentrations of carbofuran in comparison to controls, while the reduction in fertilization percentage at all concentrations of carbofuran was not significantly different from controls. The reduction in hatching percentage, the expected number of hatchlings, and the expected number of hatched larvae were significantly (p < 0.01) different between treated and control groups at all carbofuran concentrations. No significant differences for the 96 h survivability of hatched larvae were reported at all concentrations of carbofuran. 相似文献
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Sayan Bhattacharya Kaushik Gupta Sushanta Debnath Uday Chand Ghosh Dhrubajyoti Chattopadhyay Aniruddha Mukhopadhyay 《毒物与环境化学》2013,95(3):429-441
Arsenic (As) is a metalloid that poses serious environmental threats due to its behemoth toxicity and wide abundance. The use of arsenic-contaminated groundwater for irrigation purpose in crop fields elevates arsenic concentration in surface soil and in the plants. In many arsenic-affected countries, including Bangladesh and India, rice is reported to be one of the major sources of arsenic contamination. Rice is much more efficient at accumulating arsenic into the grains than other staple cereal crops. Rice is generally grown in submerged flooded condition, where arsenic bioavailability is high in soil. As arsenic species are phytotoxic, they can also affect the overall production of rice, and can reduce the economic growth of a country. Once the foodstuffs are contaminated with arsenic, this local problem can gain further significance and may become a global problem, as many food products are exported to other countries. Large-scale use of rainwater in irrigation systems, bioremediation by arsenic-resistant organisms and hyperaccumulating plants, and the aerobic cultivation of rice are some possible ways to reduce the extent of bioaccumulation in rice. Investigation on a complete food chain is urgently needed in the arsenic-contaminated zones, which should be our priority in future researches. 相似文献
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IntroductionForlasttwodecades,awaveoftheexperimentalconsciousnessisbeingdevelopedindevelopingcountriesincludingIndia.Moderntechnologyhavebeencreatedenvironmentalpollutant,ofwhichnoiseisconsideredastheworstenemyofhumanhealthandacurseofoursociety .Noisei… 相似文献
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Pest management researchers currently reappraise the use of inert dust-based insecticides because of the growing problem of environmental pollution and increasing insect resistance associated with conventional insecticides. Diatomaceous earth, which is amorphous micron-sized silica derived from fossilized phytoplankton, has become popular as an alternative insecticidal agent in European countries. In this investigation the insecticidal efficacy of amorphous lipophilic silica nanoparticle was examined on red flour beetle (Tribolium castaneum), a stored grain insect pest. The biosafety of this silica nanoparticle formulation was studied in MRC-5 cell line with water-soluble tetrazolium and lactate dehydrogenase activity assays. Acute oral toxicity of these nanocides was studied in mice model following OECD guidelines for testing of chemicals as well as the effects of particle exposure on mouse blood parameters, serum biochemical levels, and histopathological changes in various organs. 相似文献
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Environmental Fluid Mechanics - The action of wave dominated flow on river bank leads to retreatment of the bankline thereby causing intense erosion issues. The understanding of the bank erosion... 相似文献
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Roy Kumarjyoti Sikdar Debdas Pongwisuthiruchte Aphiwat Debnath Subhas Chandra Potiyaraj Pranut 《Journal of Material Cycles and Waste Management》2022,24(4):1533-1541
Journal of Material Cycles and Waste Management - The application of waste materials based fillers is unique way to achieve rubber composites, which reduces the amount of waste in the environment... 相似文献