Abstract
1. 1. The mean and maximum life-spans of both wild type Caenorhabditis elegans and the mev-1( kn 1) mutant, whose cytoplasmic Superoxide dismutase activity level is about half of the wild type, were increased and decreased under low and high concentrations of oxygen, respectively. 2. 2. The Gompertz component, a parameter of ageing rate, of the wild type was smaller under 1% oxygen than under 2% or more oxygen. Further, the Gompertz component of the mutant increased with an increase in oxygen concentration. 3. 3. The oxygen-dependent modulation of life-span and ageing rate seems to be enhanced by a genetic defect of the mutant in antioxidant defence.
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