To investigate dynamic phenomena in yeast cytoplasm a method was devel
oped that guarantees immediate inactivation of cell activity. Differen
tial extraction procedure gains porosity of the outer cell membrane ex
clusively. Application of the method during transition from glucose Li
mitation to glucose excess in Saccharomyces cerevisiae illustrates the
dynamic behaviour of yeast metabolism and emphasized the necessity of
intracellular compartmentation.