1969
DOI: 10.1099/00221287-58-3-381
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Changes in Permeability and Ultrastructure of Starved Streptococcus Lactis in Relation to Survival

Abstract: SUMMARYWhen Streptococcus lactis was starved in phosphate buffer the intracellular amino acid pool was rapidly released into the external medium from the onset of starvation whereas lactic dehydrogenase and DNA appeared in the suspending buffer only as organisms began to lose viability. Addition of spermine enhanced survival and suppressed the release of ultraviolet-absorbing material.Thin sections of Streptococcus lactis were examined by electron microscopy at intervals during starvation in a number of enviro… Show more

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Cited by 15 publications
(12 citation statements)
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“…Therefore it seemed unlikely that Streptococcus lactis was capable of synthesizing these polymers which had been reported as present in many bacterial species. Electron micrographs of thin sections showed no evidence of polyphosphate granules (Thomas & Batt, 1969).…”
Section: )-Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Therefore it seemed unlikely that Streptococcus lactis was capable of synthesizing these polymers which had been reported as present in many bacterial species. Electron micrographs of thin sections showed no evidence of polyphosphate granules (Thomas & Batt, 1969).…”
Section: )-Resultsmentioning
confidence: 99%
“…Since these compounds are known to have important structural and physiologica1 roles in bacterial membranes (Brown, 1964;Salton, 1967) any breakdown of phospholipids may be expected to impair permeability barriers. The possible significance of these observations in the survival of starved S. Zactis is discussed elsewhere (Thomas & Batt, 1969).…”
Section: Discussionmentioning
confidence: 99%
“…The only morphological alteration that could be detected was the degradation of ribosomes leading to clearer regions in the cytoplasm, characteristic of bacteria under starvation (Thomas et al, 1969).…”
Section: Estimation Of Starter Bacteria Iysismentioning
confidence: 99%
“…Starved S. Zactis is capable of fermenting glucose at a maximum rate of about 843pmolelmg. dry wt bacterialhr (Thomas & Batt, 19694. …”
Section: Resultsmentioning
confidence: 99%
“…After 120hr starvation at a feed rate of 0.25pmole glucose/mg. dry wt bacteria/hr (viability 40 %), organisms were harvested for examination by electron microscopy (Thomas & Batt, 19694. Starved cultures were progressively diluted but since survival was independent of bacterial density in the presence of added Mg2+ (Thomas & Batt, 1968), this should not have influenced the present results.…”
Section: T D Thomas a N D R D Battmentioning
confidence: 99%