STUDIES ON A STRAIN OF CAULOBACTER FROM WATER I

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Abstract
A culture from well water was identified as C. vibrioides Henrici and Johnson and an emended descr. is proposed. Cultural and biochemical characteristics are descr. The cells are gram-negative, vibrio-like, with rounded ends, 0.5 to 0.7 [mu] in length; filaments are formed occasionally. A thick slime layer or capsule is present. Young cells are actively motile with a single polar flagellum. A stalk with a central filament that appears to be continuous with the cytoplasm and a wall that appears to be continuous with the cell wall later develops at the same end as the flagellum. The cells become attached with a holdfast, frequently in rosettes, on surfaces exposed in water or a liquid medium; larger rosettes appear on a solid medium. Multiplication is by transverse fission, the flagellum and sometimes a rudimentary stalk being formed before division is complete. One type of inclusion is dense to an electron beam but is "melted" or "volatilized" by it. Another is less dense than the cytoplasm and appears to be a cell sap vacuole.
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