Microbiologie Physiologique et Appliquee, URA CNRS 697, Universite Lyon I, 69622, Villeurbanne Cedex, France.
Microb Ecol. 1990 Dec;20(1):53-63. doi: 10.1007/BF02543866.
One hundred and five strains isolated from aquifer sediments andEscherichia coli ML30S were tested for their ability to reduce manganese oxides. Eighty-two strains, includingE. coli, reduced manganese. In most cases the bacterial activity decreased the pH and Eh below 6.75 and 350 mV, respectively, enhancing a spontaneous and nonspecific reduction of manganese. However, for 12 strains the reduction was specifically catalyzed by bacteria; the high pH and Eh values would not permit a spontaneous reduction of manganese. Some of the most active strains were identified as genera common in soils and waters, i.e.,Pseudomonas, Bacillus, Corynebacterium, andAcinetobacter. Two strains were studied in detail. One of the strains, identified asPseudomonas fluorescens, required contact between the cells and the manganese oxides for reduction to occur. The reduction was inhibited by 15 mM of sodium azide. The other strain, identified asAcinetobacter johnsonii, catalyzed manganese reduction by an inductive and dialyzable substance which was excreted by the bacteria. The mechanism involved has not been previously demonstrated.
从含水层沉积物和大肠杆菌 ML30S 中分离出的 105 株菌被测试其还原锰氧化物的能力。82 株菌，包括大肠杆菌，能还原锰。在大多数情况下，细菌活性使 pH 和 Eh 分别降低到 6.75 以下和 350 mV 以下，从而促进锰的自发和非特异性还原。然而，对于 12 株菌，还原是由细菌特异性催化的；高 pH 和 Eh 值不允许锰的自发还原。一些最活跃的菌株被鉴定为土壤和水中常见的属，即假单胞菌、芽孢杆菌、棒状杆菌和不动杆菌。其中两个菌株被详细研究。其中一株被鉴定为荧光假单胞菌，需要细胞与锰氧化物接触才能发生还原。还原被 15 mM 的叠氮化钠抑制。另一株被鉴定为约翰逊不动杆菌，通过细菌分泌的诱导和可透析的物质催化锰的还原。所涉及的机制以前没有被证明过。
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