Enhancing effect of agar on swarming by Proteus

Abstract
The enhancing effect of agar on swarming by Proteus may be due to movement to a richer environment following depletion of nutrients or a response to the toxic products produced by growth. The long forms of naturally swarming colonies are similar to those induced by toxic substances such as penicillin. The association of long forms with swarming was confirmed. The swarming by the elongated cells may be strictly a mechanical phenomenon and a special form of motility. Proteus mirabilis and P. vulgaris were used.

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