Abstract
Bact. lactis aerogenes ( Aerobader aerogenes ) adapted to D-arabinose gradually loses the adaptation, at varying rates, when grown in media free from this substrate. The reversion is manifested by lag and diminished growth rate on re-transfer to D-arabinose. The tenacity with which the adaptation is held varies with the length of its original impression. The maximum D-ribulose isomerase activity of broken-up cells ( A b ) max . rapidly declines to zero when slightly adapted cells are grown in a glucose medium, but well-adapted cells can continue to produce the adaptive enzyme for long periods in the absence of D-arabinose. The bacteria develop this capacity rapidly in the course of a few cell divisions at a relatively early stage of their growth in D-arabinose. They lose it gradually in media which eventually reverse the adaptation. Appreciable lag in D-arabinose reappears when ( A b ) max . has fallen to about four times the value for unadapted organisms.
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Schedule a callMore From: Proceedings of the Royal Society of London. Series B. Biological Sciences
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