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Buoyant density fluctuates during the cell cycles of Escherichia coli K 1 2 and other bacteria (Poole, 1977a) and of a wide range of eukaryotic micro-organisms, including the fission yeast Schizosaccharomyces pombe (Mitchison, 1957; Poole & Lloyd, 1973). In E. coli ~ 1 2 and S. pombe these fluctuations cause the smallest cells in an exponential culture to have sedimentation rates higher than those of certain other size classes (Poole, 19773); this perhaps explains why cells selected for synchrony experiments by continuous-flow centrifugation (Lloyd et al., 1975) are not always the smallest in the unfractionated culture. In view of the usefulness of the continuous-flow method, and yet the uncertainty regarding the basis of the selection, we have tested the hypothesis that density fluctuations contribute to the selection process.

journal of general microbiology/journal of general microbiology

Which Cells are Selected from Exponential Cultures by Continuous-flow Centrifugation? The Selection of Small Cells from Cultures of Escherichia coli and Schizosaccharomyces pombe that Exhibit Minimal Density Fluctuations during their Cell Cycles