Abstract
The marine diatom Amphora coffeaeformis required Ca(2+) and bicarbonate for motility. Movement was inhibited by the Ca(2+)-blocking agents ruthenium red and alpha-isopropyl-alpha-[(N-methyl-N-homoveratryl)-alpha- aminopropyl]-3,4,5-trimethoxy phenyl acetonitrile and the metabolic energy uncoupler, carbonyl cyanide 3-chlorophenylhydrazone. 3-(3',4-Dichlorophenyl)-1,1-Dimethyl urea was without effect on cells at a concentration that prevented O(2) production in the light. Although Sr(2+) could replace Ca(2+) in the attachment of cells to glass, it did not substitute for Ca(2+) in motility.
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