{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T23:27:06Z","timestamp":1790983626984,"version":"4.1.0"},"reference-count":25,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2007,6,15]],"date-time":"2007-06-15T00:00:00Z","timestamp":1181865600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biotech &amp;amp; Bioengineering"],"published-print":{"date-parts":[[2008,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Dried microorganisms are particularly resistant to high hydrostatic pressure effects. In this study, the survival of <jats:italic>Saccharomyces cerevisiae<\/jats:italic> was studied under pressure applied in different ways. Original processes and devices were purposely developed in our laboratory for long\u2010term pressurization. Dried and wet yeast powders were submitted to high\u2010pressure treatments (100\u2013150 MPa for 24\u2013144 h at 25\u00b0C) through liquid media or inert gas. These powders were also pressurized after being vacuum\u2010packed. In the case of wet yeasts, the pressurization procedure had little influence on the inactivation rate. In this case, inactivations were mainly due to hydrostatic pressure effects. Conversely, in the case of dried yeasts, inactivation was highly dependent on the treatment scheme. No mortality was observed when dried cells were pressurized in a non\u2010aqueous liquid medium, but when nitrogen gas was used as the pressure\u2010transmitting fluid, the inactivation rate was found to be between 1.5 and 2 log for the same pressure level and holding time. Several hypotheses were formulated to explain this phenomenon: the thermal effects induced by the pressure variations, the drying resulting from the gas pressure release and the sorption and desorption of the gas in cells. The highest inactivation rates were obtained with vacuum\u2010packed dried yeasts. In this case, cell death occurred during the pressurization step and was induced by shear forces. Our results show that the mechanisms at the origin of cell death under pressure are strongly dependent on the nature of the pressure\u2010transmitting medium and the hydration of microorganisms. Biotechnol. 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