排序方式： 共有24条查询结果，搜索用时 15 毫秒
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Medeiros ID Siebert MN de Toledo e Silva G Moraes MO Marques MR Bainy AC 《Marine environmental research》2008,66(1):156-157
In order to investigate the influence of domestic sewage on the gene expression of Pacific oysters Crassostrea gigas, suppression subtractive hybridization (SSH) method was employed. Oysters were sampled at a farming area and, after 10 days of acclimation in the laboratory, were exposed to untreated domestic sewage diluted 33% for 48 h. Gills of male oysters were excised for total RNA extraction. mRNA was purified and the differential gene expression was analyzed by SSH. We obtained 61 cDNA sequences but only 15 were identified, which includes fatty acid binding protein, multidrug resistance protein, omega glutathione S-transferase, cytochrome P450 isoform CYP356A1, among others. The identified genes are associated with different metabolic functions like biotransformation, membrane transport, aerobic metabolism and translational machinery, evidencing the potential toxic effects elicited by these effluents. 相似文献
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Junio René Toledo Fagundes Lázaro Valentin Zuquette 《Environmental Earth Sciences》2011,62(4):831-845
Pollutant transport through porous geological materials depends on the intrinsic characteristics of the materials that define
the sorption behavior. This is the main environmental aspect that must be evaluated in terms of natural attenuation and retardation
factor of the pollutants. Sorption is directly related to the electrostatic charge of the mineral, the organic matter, and
the oxide and hydroxide contents. We assessed the sorption characteristics of the sandy residual unconsolidated material of
the Botucatu Formation, which is part of the main aquifer of Brazil, using Batch Equilibrium Tests. The tests used multicomponent
solutions of NaCl, KCl, ZnCl2, and CuCl2·H2O with a total concentration that varied from 20 to 1,000 ppm. Different plotting systems were applied so that the isotherms
better reflected the sorption behavior of the studied cations onto the unconsolidated materials. The cation Na+ was not sorbed. The Langmuir I and Freundlich equations adequately represent the behavior of Cu++, the Langmuir II approximation better represented K+, and the Langmuir I and Freundlich equations were reasonably fitted Zn++. 相似文献
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