We reported earlier that Pediococcus cerevisiae FBB-61 inhibited Lactobacillus plantarum FBB-67 in mixed species inoculation used for the fermentation of brined cucumbers. Herein, 16 isolates of the Pediococcus genus from various sources were tested for inhibitory activity against L. plantarum and other microorganisms by a seeded-agar screening technique. Only two of thq ' Paper no. 4682 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh, and paper no. 7157, Michigan Agricultural Experiment Station.
ETCHELLS, COSTILOW, BELL, AND DEMAIN tation of glucose. Structural analogs of nicotinamide proved to be the most effective means of lowering alcohol yields. These probably acted by competing with DPN for its enzyme site. Only the amides and not the acids of the analogs tested had inhibitory activity. The addition of one of the active analogs to the yeast fermentation decreases alcohol formation and increases ketol yields by 20 per cent. Nevertheless, it was impossible by any of these methods to shunt all of the added aldehyde to the system synthesizing phenylacetylcarbinol. acetylcarbinol synthesis by yeast. J. Bacteriol., 66, 440-445.
the use of propionate agar resulted in very low yeast counts in samples of plant material as compared to the populations obtained with acidified dextrose agar and synthetic agar. Acidified synthetic agar proved to be the medium of choice for the enumeration and isolation of yeasts from plant material. Counts obtained on this medium were comparable to those on acidified dextrose agar and mold growth was satisfactorily controlled because of restricted colonial development on the synthetic medium.
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