摘要: Morphology varies from rods to cocci. Cells are usually single or diploid, occasionally forming chains and tetrads. Do not form rosettes. If motile, possess polar flagellum. Gram negative. The majority of species produce a polysaccharide cyst-like resting stage. Cysts may be desiccation resistant sensitive. Dissimilatory methane oxidation is associated with type I intracytoplasmic membranes, which appear as stacks vesicular disks derived convolutions the cytoplasmic membrane. Catalase oxidase produced. Strictly aerobic respiratory metabolism oxygen electron acceptor. Obligate utilizers other C 1 compounds for carbon energy. Compounds carbon-carbon bonds utilized. High levels organic solutes ammonia ions inhibit growth. C1 incorporated by ribulose monophosphate pathway. tricarboxylic acid cycle incomplete, 2-oxoglutarate dehydrogenase activity absent. Nitrogenase present. Contain mainly 16 fatty acids, predominantly monounsaturated several different C16:1 isomers Ubiquinone-8 18-methyleneubiquinone-8 predominant lipoquinones.
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