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A mutant of Sfrepfococcus faecalis has been isolated which has a ZO-fold higher growth requirement for L-glutamic acid than the parent strain. The ability to utilize L-glutamine for growth is not affected. The mutant also has a greater dependence than the parent strain on an external supply of vitamin B6. The rate of glutamic acid transport at low(More)
Electron microscopic study of Lactobacillus plantarum revealed mesosomes in different stages of maturation and structural relation with other cell organelles. Small, immature mesosomes were bounded by a prominent electron-dense layer with another extremely faint layer on the outside. This corresponds to the appearance of the cytoplasmic membrane. Large(More)
The transport of alpha-methyl-L-glutamic acid was studied in Streptococcus faecalis. Energey-dependent uptake against substantial concentration gradients was observed. Kinetic experiments indicated that, in contrast to L-glutamic acid, only a single catalytic component (high affinity) and a diffusion controlled process participated in(More)
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