.... (▴) assay 1; (△) assay 2; (◊) assay 3. * Author for correspondence. 23 06 1986 26 06 1986 © 1986 by Company of Biologists 1986 cdc mutants cell cycle enzyme activity fission yeast nucleoside diphosphokinase Schizosaccharomyces pombe wee mutants Enzymes...

... growth speeded up in rich medium and slowed down in poor medium and at lower temperature. It is also maintained after a shift-up in temperature. Results with wee mutants suggest that the association is with the S period rather than division itself. The rate and acceleration of CO 2 production...

... & Thuriaux, 1977 ; Fantes & Nurse, 1978 ). According to this model, DNA replication is only initiated when cells attain a certain critical cell size and when they have completed a short G 1 per10d of about 0·1 of a cell cycle. In small dividing cells such as the wee mutants, S phase is delayed until...