Competing Patterns of Signaling Activity in Dictyostelium discoideum

Details Competing Patterns of Signaling Activity in Dictyostelium discoideum Competing Patterns of Signaling Activity in Dictyostelium discoideum

1996-01-28

arxiv.org/abs/cond-mat/9601135v1

Physics

Condensed Matter

10 pages, RevTeX, 4 ps figures, accepted in PRL

Scientific paper

10.1103/PhysRevLett.76.1174

Quantitative experiments are described on spatio-temporal patterns of coherent chemical signaling activity in populations of {\it Dictyostelium discoideum} amoebae. We observe competition between spontaneously firing centers and rotating spiral waves that depends strongly on the overall cell density. At low densities, no complete spirals appear and chemotactic aggregation is driven by periodic concentric waves, whereas at high densities the firing centers seen at early times nucleate and are apparently entrained by spiral waves whose cores ultimately serve as aggregation centers. Possible mechanisms for these observations are discussed.

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