Rensing Christopher, Maier Raina M
Department of Soil, Water, and Environmental Science, University of Arizona, Room 429, Shantz Boulevard # 38, Tucson, AZ 85721, USA.
Ecotoxicol Environ Saf. 2003 Sep;56(1):140-7. doi: 10.1016/s0147-6513(03)00057-5.
Heavy metal-mediated toxicity in the environment is dependent on bioavailable metal concentrations both internal and external to microbial cells. Both internal and external metal bioavailability are influenced by multiple factors in the soil environment. External factors include pH, redox potential, ionic strength, organic matter and clay content. The internal bioavailable metal concentration is dependent on both the aforementioned external factors, as well as metal uptake and efflux activities that are specific for each microorganism. The metal-specific biosensors discussed in this article can be used to measure internal metal bioavailability.
环境中重金属介导的毒性取决于微生物细胞内外的生物可利用金属浓度。土壤环境中的多种因素会影响细胞内外的金属生物有效性。外部因素包括pH值、氧化还原电位、离子强度、有机质和粘土含量。内部生物可利用金属浓度既取决于上述外部因素，也取决于每种微生物特有的金属吸收和外排活动。本文讨论的金属特异性生物传感器可用于测量内部金属生物有效性。
