Abstract
1. Colonies of several gliding, semi-motile and non-motile strains ofMyxococcus xanthus demonstrate a constant rate of diameter increase. Colonies of motile strains, characterized by a predominance of cell swarms at the leading edges, expand more rapidly than those with single, gliding cells at their peripheries. 2. Colony growth rate is proportional to the growth rate of cells in shake culture and on agar and to the square root of nutrient concentration over a wide concentration range. The rate of colony growth is affected by temperature and by agar concentration and depth but not by hight nor gravity.
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