Sometimes juice and drinking water are polluted by Saccharomyces cerevisiae, one kind of single-cell eukaryotic organisms. Electromagnatic treatment is a promising approach for the control of such pollution. In this study, the effect of magnetic fields on the growth and physiological changes of Saccharomyces cerevisiae was investigated. The specific growth rate increased under 0.02-0.05T static magnetic fields and it was a negative value when the magnetic intensity was higher than 0.1T. The content of amino acids and vitamins changed respectively under 0.05T and 0.5T magnetic fields. The content of amino acids was increased under 0.05T magnetic fields, but decreased under the latter intensity. Differing from these, the content of vitamins altered by one direction under 0.05T and 0.5T magnetic fields. The magnetic fields would also influence the activities of antioxidant enzymes. Activities of SOD, CAT and PPO were determined. The membrane fluidity also changed differently under static and dynamic magnetic fields. It was inferred that the magnetic fields would influence the physiology of yeast by altering their membrane fluidity and enzyme activities and, thus, the metabolism was changed and some macromolecules and other nutrients were leaked from inside of the cells to the outside. This study may provide some basic data for further study of controlling the yeast pollution in juice or drinking water.
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