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目前我们对环境污染物毒性的认识主要来源于对某单一化学物质在相对高浓度情况下的研究.然而,人们在其一生中很少只暴露于单独某一种化学物质,而是同时暴露于多种低浓度的化学物质.从公众健康的角度讲,大家主要担心的是当两种和两种以上化学物质相互作用时,两者能否产生不同寻常的协同毒性.五氯酚、威百亩等有机农药和含铜、锌等无机农药皆被用作通用杀虫剂或木材保护剂,两者在许多农田和木材保护处理场所附近的土壤和水体以及在普通人群的体液和组织中,均发现同时共存.我们最近的研究表明,这两类物质共存时可以对大肠杆菌产生协同毒性效应,其协同毒性作用机制可能是由于两者形成了亲脂性络合物,促进了细胞对金属离子的吸收和累积.此类有机和无机污染物之间的相互作用以及亲脂性络合物形成而导致的协同毒性作用,可能是普遍存在于有机和无机污染物之间的一种共同毒性作用机制.这一假设是否成立,尚有待进一步的实验和理论研究.
At present, our understanding of the toxicity of environmental pollutants comes mainly from the study of a single chemical substance at a relatively high concentration, however, it is rare for people to be exposed to only a single chemical substance throughout their lifetime, A variety of low concentrations of chemicals. From a public health point of view, the main concern is that when two and more than two kinds of chemical substances interact, both can produce unusual synergistic toxicity. Pentachlorophenol, Mu and other inorganic pesticides such as copper and zinc are used as general purpose insecticides or wood preservatives, both in soils and bodies of water near many farmland and timber conservation sites and in body fluids and tissues of the general population, We found that co-exist simultaneously.Our recent studies show that these two types of substances co-exist when E. coli can produce a synergistic toxic effect of its synergistic toxicity mechanism may be due to the formation of two lipophilic complexes, and promote the cells to metal ions Of the absorption and accumulation of such organic and inorganic pollutants and the interaction between lipophilic complex formation caused by the synergistic toxicity may be ubiquitous A common mechanism of action between toxic organic and inorganic contaminants. This hypothesis by further experimental and theoretical studies remains to be.