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J. Bacteriol., 08 1997, 4963-4969, Vol 179, No. 16
Copyright © 1997, American Society for Microbiology

Cell cycle characteristics of thermophilic archaea

R Bernander and A Poplawski
Department of Microbiology, Biomedical Center, Uppsala University, Sweden. Rolf.Bernander@bmc.uu.se

We have performed a cell cycle analysis of organisms from the Archaea domain. Exponentially growing cells of the thermophilic archaea Sulfolobus solfataricus and Sulfolobus acidocaldarius were analyzed by flow cytometry, and several unusual cell cycle characteristics were found. The cells initiated chromosome replication shortly after cell division such that the proportion of cells with a single chromosome equivalent was low in the population. The postreplication period was found to be long; i.e., there was a considerable time interval from termination of chromosome replication until cell division. A further unusual feature was that cells in stationary phase contained two genome equivalents, showing that they entered the resting stage during the postreplication period. Also, a reduction in cellular light scatter was observed during entry into stationary phase, which appeared to reflect changes not only in cell size but also in morphology and/or composition. Finally, the in vivo organization of the chromosome DNA appeared to be different from that of eubacteria, as revealed by variation in the relative binding efficiency of different DNA stains.


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