CELL ELONGATION AND DIVISION IN SPIRILLUM ANULUS

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Abstract
Cell growth, elongation, and division occur in the unicellular bacterium, Spirillum anulus (Williams and Rittenberg, 1957). Living cells, taken from a 14-hr. broth culture, were observed in sealed wet mount preparations by phase contrast and dark field microscopy. Growth and division occurred in 4 cells during the 3-hr. period of observation. The greater amount of cell elongation occurred at the center of the cells. By the use of the inclusions, present in cell B, as markers, no evidence of budding was observed to occur at one or both poles of this unicellular bacterium. The conclusion was reached that growth and elongation of the cells of S. anulus occur diffusely along the entire length of the cell wall by intercalation.
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