Cephalic mechanism for social control of fissioning in planarians. II. Localization and identification of the receptors by electron micrographic and ablation studies.
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Animals↗
Biomedical subjects
A Pigon
Publications and source records attributed to A Pigon.
Inhibition of movement, attachment, and cytokinesis by autogenous substances in the amoeba Hartmannella.
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Cell Adhesion↗
Hartmannella: culture growth and cell-substratum contact.
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Agar↗
Fissioning in planarians: control by the brain.
Reduced population densities lead to increased rates of fissioning in planarians whereas higher population densities suppress fissioning. This effect is not primarily due to mucus deposition or substances secreted into the water. Experiments are presented which show a system of population feedback control. In the presence of other planarians, the brain exerts an influence (probably neurohormonal) to suppress fissioning. This influence becomes attenuated with axial distance from the brain.
Animals↗
Effect of tricarboxylic acid cycle intermediates and related compounds on the respiratory rate of Urostyla cristata and Colpoda cucullus.
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Acids↗