Buck, John D. (University of Miami, Miami, Fla.), Donald G. Ahearn, Frank J. Roth, Jr., and Samuel P. Meyers. Inhibition of yeasts by a marine bacterium. J. Bacteriol. 85:1132-1135. 1963.-Although investigations have shown the widespread occurrence of yeasts in the marine environment, notably members of the genus Rhodotorula, studies of a marine amphipod community revealed few, if any, pink yeasts. A gram-negative bacterium (designated AEB, a member of the genus Pseudomonas) isolated from the amphipod habitat showed marked selective ability to inhibit yeasts of both terrestrial and marine origin. Activity was demonstrated with both live cultures of the bacterium and untreated cell-free filtrates. Variously extracted and treated filtrates of the isolate have shown divergent patterns and spectra of inhibition of species of the genus Rhodotorula and of other genera.