Abstract
Newly isolated Xanthobacter strains were characterized. In addition, the fatty acid compositions and quinone systems of gram-negative, yellow-pigmented, hydrogen-oxidizing bacteria belonging to the genera Xanthobacter, Hydrogenophaga, and Variovorax and related species were studied. Xanthobacter strains are nitrogen-fixing organisms that have a Q-10 ubiquinone system; the cellular fatty acids of these organisms include high levels of C18:1 acid, and their hydroxy fatty acids include high levels of 3-OH C16:0 acid. Hydrogenophaga strains are polarly flagellated organisms that have a Q-8 ubiquinone system. These bacteria can be divided into two groups on the basis of cellular fatty acid and hydroxy fatty acid compositions. Variovorax strains are peritrichously flagellated, non-nitrogen-fixing organisms that have a Q-8 ubiquinone system; the cellular fatty acids of these strains include high levels of C16:0, C16:1 and C18:1 acids, and their hydroxy fatty acids include 3-OH C10:0 and 2-OH C14:0 acids. Xanthobacter, Hydrogenophaga, and Variovorax strains can be clearly distinguished from each other on the basis of their quinone systems and cellular fatty acid compositions.
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