Abstract
The nematode Caenorhabditis elegans was cultured monoxenically with E. coli as a food source and the influence of the bacterial growth conditions on the life span was studied. When bacterial growth was restricted by reducing the concentration of bactopeptone, which was supplied as the energy source in nematode growth medium (NGM), the nematode's life span tended to be prolonged without a marked effect on postembryonic development. The effect of bactopeptone on the life span was clearly observed during the postreproductive period (that is, after the egg-laying stage of the wild-type C. elegans) rather than during the larval to young adult stage. Evidence is presented that this alteration of the life span was not brought about by any factor in the bactopeptone but by the concentration of bacteria.
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