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Journal of Cell Science, Vol 14, 681-690, Copyright © 1974 by Company of Biologists

Submitted on August 1, 1973

Observations on the Growth of Dictyostelium Discoideum in Axenic Medium: Evidence for an Extracellular Growth Inhibitor Synthesized by Stationary Phase Cells

J. YARGER 1, K. STULTS 1, and D. R. SOLL 1

1 Department of Zoology, University of Iowa Iowa City, Iowa 52242, U.S.A.

By analysing the growth kinetics of Dictyostelium discoideum amoebae in varying combinations of the components of the nutrient medium HL-5 (Cocucci & Sussman, 1970), we have demonstrated that Dictyostelium amoebae enter stationary phase when they deplete the medium of one or more nutrient components. However, if the medium of a stationary phase culture is supplemented with any of the initial components of HL-5 medium and even when supplemented with all components of HL-5 medium, it does not support the growth of freshly inoculated cells, indicating that stationary phase cultures produce a potent growth inhibitor. The possible function of this inhibitor is discussed.

Submitted on August 1, 1973




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© The Company of Biologists Ltd 1974