Effect of medium composition on the ultrastructure of Lactobacillus strains

The growth of some locally isolated Lactobacillus strains forming D(-) or L(+) lacticacid, Lactobacillus helveticus ATCC 15009 and Lactobacillus del- brueckii subsp. bulgaricus ATCC 11842 was examined in different media. L. helveticus and Lactobacillus LBL strains formed atypical protoplast-like cel...

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Bibliographic Details
Published in:Archives of microbiology 1993-08, Vol.160 (2), p.132-136
Main Authors: Pavlova, S.I, Miteva, V.I, Mihailova, L.I, Radoevska, S.A, Stefanova, T.Tz
Format: Article
Language:English
Subjects:
anatomy and morphology
Bacteriology
Biological and medical sciences
cell ultrastructure
cell walls
culture media
Fundamental and applied biological sciences. Psychology
growth
lactic acid
Lactobacillus
Lactobacillus delbrueckii
Lactobacillus delbrueckii subsp. bulgaricus
Lactobacillus helveticus
metal ions
Microbiology
Morphology, structure, chemical composition
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Summary:The growth of some locally isolated Lactobacillus strains forming D(-) or L(+) lacticacid, Lactobacillus helveticus ATCC 15009 and Lactobacillus del- brueckii subsp. bulgaricus ATCC 11842 was examined in different media. L. helveticus and Lactobacillus LBL strains formed atypical protoplast-like cells in LAPT medium, sensitive to SDS and proteinase. Specific morphological changes in the cell wall structure of these variants were revealed by transmission and scanning electron microscopy. The effect of glucose and various salts on their appearance was investigated. The prevalent role of metal cations, especially of Mg(2+), was established.
ISSN:0302-8933
1432-072X
DOI:10.1007/bf00288715