Water and Soil Environment Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305, Japan.
Appl Environ Microbiol. 1994 Jul;60(7):2227-31. doi: 10.1128/aem.60.7.2227-2231.1994.
Growth and cesium accumulation characteristics of two cesium-accumulating bacteria isolated from soils were investigated. Rhodococcus erythropolis CS98 and Rhodococcus sp. strain CS402 accumulated high levels of cesium (approximately 690 and 380 mumol/g [dry weight] of cells or 92 and 52 mg/g [dry weight] of cells, respectively) after 24 h of incubation in the presence of 0.5 mM cesium. The optimum pH for cesium uptake by both Rhodococcus strains was 8.5. Rubidium and cesium assumed part of the role of potassium in the growth of both Rhodococcus strains. Potassium and rubidium inhibited cesium accumulation by these Rhodococcus strains. It is likely that both Rhodococcus strains accumulated cesium through a potassium transport system.
研究了从土壤中分离得到的两种耐铯细菌的生长和铯积累特性。红球菌 CS98 和 Rhodococcus sp. 菌株 CS402 在含有 0.5mM 铯的条件下孵育 24 小时后,分别积累了约 690 和 380μmol/g(干重)的细胞或 92 和 52mg/g(干重)的细胞的铯。两种红球菌菌株摄取铯的最佳 pH 值为 8.5。铷和铯在两种红球菌菌株的生长中部分替代了钾的作用。钾和铷抑制了这些红球菌菌株对铯的积累。这两种红球菌菌株可能通过钾转运系统积累铯。