upon fractionating saccharomyces cerevisiae asynchronous cultures by sucrose density gradient centrifugation in a zonal rotor and examining the exo-1,3-beta-glucanase and deoxyribonucleic acid content of the cells , a periodic step increase in the activity of this enzyme was observed , indicating a discontinuous pattern of synthesis or activation of exo-1,3-beta-glucanase during the mitotic cycle at the transition from the s to the g ( 2 ) phase .
C0007634
cells
C0026255
mitotic cycle