Strains of facultative methylotroph were compared with other gram-negative, nonsporeforming, nonmotile, curved, and ring-forming bacteria. These bacteria utilize methanol and hydrogen, but not methane. The major cellular fatty acid is straight-chain unsaturated C acid. The major ubiquinone is Q-10, and Q-9 and Q-11 are present as minor components. Based on the above data, these methylotrophs are distinguished from the other similar curved and ring-forming bacteria: , and . The latter three genera do not utilize methanol, have low deoxyribonucleic acid base compositions, possess different cellular fatty acids, and have a menaquinone-7 system. Furthermore, is clearly distinguished from in cellular fatty acid composition.


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