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Environmental Science and Pollution Research - Phosphorus is an essential macro-mineral nutrient for poultry, needed for the body growth, development of bones, genomic function, good...  相似文献   
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We examined arsenic (As) uptake by vegetable crops (amaranth, Amaranthus gangeticus, and silverbeet, Beta vulgaris) as affected by As speciation (AsIII and AsV) and their concentrations in nutrient solution. Amaranth and silverbeet were grown in a nutrient solution containing four levels of arsenate (AsV): 0, 1, 5, and 25 mg As/l and three levels of arsenite (AsIII): 0, 5, 10 mg As/l. Both AsV and AsIII are phytotoxic to these crops with the latter being five times more toxic. Amaranth treated with AsIII exhibited As toxicity symptoms within 48 h of exposure and was close to death within 1 week. However, AsV treatment did not show clear toxicity symptoms other than wilting and yield reduction at the highest dose rate of 25 mg AsV/l. The main mechanism used by vegetable crops to tolerate AsV is probably avoidance—limiting As transport to shoots and increasing As accumulation in the root system. When AsV was added to the nutrient solution, the uptake of As in shoots increased and, at the highest dose (25 mg AsV/l), 60 μg As/g DW (3.6 mg/kg FW) accumulated in the edible portion, which exceeds the WHO recommended limit for food stuffs (2 mg/kg FW) as the water contents of the crops were 94%. It is therefore important to determine the nature of the As species and their bio-accessibility. Iron treatment with 0.5 mg NaFe(III)EDTA/l dose decreased silverbeet As uptake by 45% given its affinity to bind As at the root surface or root rhizosphere and so restrict As translocation to the shoots.  相似文献   
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Abstract

This study assessed the long-term toxicity of chlorpyrifos on survival and reproduction of Banded Gourami by using mortality, gonado-somatic index (GSI) and histopathological observations as endpoints. Adult fish were exposed to five different concentrations of chlorpyrifos (0, 15, 50, 150, 500?µg/L) in 15 PVC tanks for 15, 30, 45, 60 and 75?days. Results showed that all male and female fish died after 15?days of 500?µg/L chlorpyrifos exposure. No consistent significant effect was observed for both male and female GSI. Furthermore, results showed dose- and time-dependent histopathological alterations for both ovary and testes. The 60-d No Observed Effect Concentration (NOEC) for most histopathological alterations of Banded Gourami ovary and testes was 50?μg/L, while 60-d NOEC for mortality of both male and female fish was < 15?μg/L. The results show that the long-term exposure to chlorpyrifos not only affect the reproductive tissues of Banded Gourami at exposure concentrations but also cause their mortality. Future studies should evaluate effects at lower concentrations.  相似文献   
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Environmental Science and Pollution Research - Good brain health refers to a condition in which a person may fully realize their talents and improve their psychological, emotional, cognitive, and...  相似文献   
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