Abstract
X-ray microanalysis showed that vegetative cells, viable resting forms, and nonviable forms (micromummies) of the bacteria Bacillus cereus and Micrococcus luteus and the yeast Saccharomyces cerevisiae differ in the content of elements S, P, Ca, and K and Ca/K and P/S ratios. Viable resting forms (cystlike refractive cells and bacillar endospores) had more calcium and less phosphorus and potassium than vegetative cells, the difference being higher for bacilli than for micrococci and yeasts. The distinctive feature of all viable resting microbial forms was their low P/S ratios and high Ca/K ratios. The differences revealed in the cellular content and ratios of elements probably reflect changes in ionic homeostasis accompanying the transition of vegetative microbial cells to the dormant state. Relevant potassium parameters indicate that the membranes of viable resting forms retain their barrier function. At the same time, the nonviable micromummies, even those morphologically intact, of B. cereus and S. cerevisiae exhibited an anomalously low content of potassium, while those of M. luteus had an anomalously high content of this element. This suggests that the cellular membranes of micromummies lose their barrier function, which results in a free diffusion of potassium ions across the membranes. The possibility of using the elemental composition parameters for the quick analysis of the physiological state of microorganisms in natural environments is discussed.
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Mulyukin, A.L., Sorokin, V.V., Loiko, N.G. et al. Comparative Study of the Elemental Composition of Vegetative and Resting Microbial Cells. Microbiology 71, 31–40 (2002). https://doi.org/10.1023/A:1017942114930
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DOI: https://doi.org/10.1023/A:1017942114930