Article Abstract:
The adaptation of Listeria monocytogenes to certain environmental stresses, i.e., acid, ethanol, hydrogen peroxide, heat and NaCl, was studied. Findings showed that adaptation to pH 4.5 to 5.0 or 5% ethanol substantially increased the resistance of L. monocytogenes to lethal doses of acid, ethanol and H2O2. Adaptation to ethanol substantially enhanced the resistance to 25% NaCl. Results indicated that stress protection after adaptation to environmental stresses depends on the type of stress and the lethal factor applied.
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Article Abstract:
The mechanisms of divalent cation uptake and its uptake capacities in both live and denatured forms of laboratory- and brewed-derived strains of Saccharomyces cerevisiae are examined and compared, respectively. Experiments involved the examination of strontium uptake in biomass obtained from laboratory and industrial sources. All biomass types exhibited release of cellular Ca2+, Mg2+ and H+ in response to both metabolism independent and dependent uptake processes.
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Article Abstract:
The effect of xylulose metabolism on product formation is investigated by growing Saccharomyces cerevisiae ATCC 24860 on glucose and a mixture of glucose and xylulose under anoxic conditions. Results show that xylulose co-utilization in S. cerevisiae is accompanied by a shift in product formation from ethanol to acetate and arabinitol. Xylulokinase actvity is also absent during glucose metabolism.
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