Martin J. Beker

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This paper describes the characteristics of the structural and functional organization of cellular membranes rehydrated after dehydration of the yeast Saccharomyces cerevisiae. It was noted that dehydration and subsequent rehydration of yeast cells causes a considerable increase of cytoplasmic membrane permeability. Addition of CaCl2, glucose and(More)
The fatty acid composition of the total lipids and phospholipids of intact and convectively dried yeast has been studied and an increase has been detected in the degree of unsaturation of fatty acids during dehydration. The validity of the inverse relation between the viability of the yeast population during dehydration and rehydration and the degree of(More)
The energetics, enzyme activities and end-product synthesis of Zymomonas mobilis 113 in continuous culture were studied after the shift from an anaerobic to an aerobic environment. Aeration diminished ethanol yield and lactic acid concentration, but increased glucose consumption rate and production of acetic acid. After the shift to aerobic conditions(More)
Changes in the degree of unsaturation of fatty acids during drying and rehydration of native yeast are shown as well as changes in the indices of direction and intensity of alternative metabolic pathways — activities of alcohol dehydrogenase [E.C. 1.1.1.1], glucoso-6-phosphate dehydrogenase [E.C. 1.1.1.49], and mytochondrial ATPase [E.C. 3.6.1.5].(More)
An investigation was made of changes in ergosterol content of the yeast Saccharomyces cerevisiae upon drying and subsequent rehydration. It was established that drying increases, but rehydration diminishes ergosterol content in yeasts. A statistically reliable multiple correlation was established between the resistance of population to drying, decrease of(More)
It has been shown that dehydration markedly affects the activity of a number of enzymes connected with energy metabolism in the yeastSaccharomyces cerevisiae. Independently of the drying method used, there was found to be an inverse relationship between the activity of mitochondrial enzymes — NADH-dehydrogenase (EC 1.6.2.1), succinate dehydrogenase (EC(More)
In Theoretical and Methodological Basis of Continuous Cultivation of Microorganisms -the fundamental work by Czech technical microbiologists, Dr. Z. Fencl gives a brilliant theoretical analysis of various systems of continuous cultivation of microorganisms and draws general conclusions, which, wi thout material changes, already for a quarter of a century(More)
In comparison with intact yeast, dehydrated-rehydrated cells of Saccharomyces cerevisiae show significantly higher ethanol production from exogenous substrate under both anaerobic and aerobic conditions, particularly when low concentration (0.1%) of glucose are used. For populations with a higher percentage of viable rehydrated cells (above 70%) a more(More)
The effect of cultivation and dehydration conditions on the adenosine phosphate content of yeast cells has been studied. Irrespective of the cultivation conditions the total pool of adenosine phosphates was found to increase, mainly due to accumulation of ATP, during the exponential phase of cell growth and to decrease during transition of the culture into(More)
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