The marine methanol-utilizing bacteria in the genus Methylophaga are obligately methylotrophic, but some strains utilize d-fructose in addition to methanol. The deoxyribonucleic acid base composition of these organisms ranges from 43.0 to 49.0 mol% guanine plus cytosine. Their cellular fatty acids consist predominantly of large amounts of straight-chain saturated C16:0 acid and unsaturated C16:1 acid. Methylophaga strains are distinguished from Methylobacillus strains by their tolerance to sodium chloride and their deoxyribonucleic acid base composition and from Methylomonas and Methylococcus strains by their utilization of methane, their tolerance to sodium chloride, and their deoxyribonucleic acid base composition.
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