Abstract
Normal strains of Bacterium lactis aerogenes and of Escherichia coli only utilize 'D-arabinose after a long lag (A - ), but can become adapted to use it freely (A + ). In a medium not con- M taiiiing D-arabinose the A + and A - types can compete for predominance as more or less independent strains. The result of the com petition in the examples studied never depended upon the initial proportions of the two types (as certain selective mechanisms would suggest) but simply upon the relative extent to which each strain had been previously acclim atized to the specific minimal medium used for the com petitive growth. According to the previous history either type could be initially selected, or an even balance preserved for a considerable time.onsiderable time.
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Schedule a callMore From: Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
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