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Abstract.Rhodococcus sp. RB1 was able to thrive in media with up to 0.9M NaCl or KCl and in the presence of high concentrations of nitrate (up to 0.9M) and nitrite (up to 60mM), but only under oxic conditions. An adaptation period was not required for salt tolerance, but a rapid extrusion of K+ and intake of Na+ was observed after addition of 0.5M NaCl. Nitrate assimilation was limited by the carbon...
Rhodobacter capsulatus grew by using either L- or D-malate as carbon sources under light/anaerobic conditions. The cellular yields were the same with D- or L-malate. Both L-malate dehydrogenase and L-malic enzyme activities were detected in cell-free extracts from cells grown in both isomers. By contrast, a racemase activity converting D-malate into L-malate was induced only when D-malate was present...
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