Factors Influencing Filament Length of Methanospirillum hungatii

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Abstract
Cultivation of Methanospirillum hungatii GP1 at 35\ub0C in low PO43- (3\ub70 mm) medium resulted in growth as motile curved rods (6 to 8 \ud7 0\ub75 \u3bcm). However, predominantly long filaments averaging 70 to 300 \u3bcm were observed in the presence of high concentrations of PO43- (43\ub77 mm) or Na+ (225 mm) or after incubation at 25\ub0C in low PO43- medium. These conditions also resulted in decreased growth rates. Tests with cell-free extracts of long and short form filaments indicated that long filament formation is probably related to a deficiency in heat-labile factor(s) required for cell separation.Peer reviewed: NoNRC publication: Ye

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