Abstract
The phototrophic bacteria Rhodobacter sphaeroides, Rhodobacter capsulatus, Rhodospirillum rubrum, Rhodobacter blasticus and Rhodocyclus tenuis alter their cell size when exposed to the metalloid oxyanions chromate, selenate and arsenate at concentrations which only slightly reduce the growth rate of the organisms. Dependent on the oxyanions the cells increased in size up to tenfold and more. Selenate and arsenate have the biggest impact on the morphology of the bacteria. These microscopic observations were confirmed by counting and sizing the cells in a Neubauer counting chamber and by flow cytometry. In addition comparison of the protein pattern of arsenate stressed cells with the proteins from control cells showed that the morphological changes are paralleled by changes on the protein level.
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