yeasts
Food MicrobiologySaccharomyces cerevisiae Cytosolic Thioredoxins Control Glycolysis, Lipid Metabolism, and Protein Biosynthesis under Wine-Making ConditionsOxidative stress is a common hazardous condition that cells have to face in their lifetime. Oxidative damage may diminish cell vitality and viability by reducing metabolism and eventually leading to aging and ultimate death. Wine yeast Saccharomyces cerevisiae also faces oxidative attack during its biotechnological uses. One of the main yeast antioxidant systems...
Food MicrobiologyInactivating Mutations in Irc7p Are Common in Wine Yeasts, Attenuating Carbon-Sulfur β-Lyase Activity and Volatile Sulfur Compound ProductionVolatile sulfur compounds contribute to wine aromas that may be considered pleasant, such as “tropical,” “passionfruit,” and “guava,” as well as aromas that are considered undesirable, such as “rotten eggs,” “onions,” and “sewer.” During fermentation, wine yeasts release some of these compounds from odorless precursor molecules, a process that is most efficient when performed by yeasts that express active forms of the protein Irc7p. We...
Food Microbiology | SpotlightThe Interior Surfaces of Wooden Barrels Are an Additional Microbial Inoculation Source for Lambic Beer ProductionAlthough the coolship step is generally regarded as the main contributor to the spontaneous inoculation by environmental air of fresh worts for lambic beer production, it is known that microorganisms often associate with specific surfaces present in a brewery. However, knowledge about the association of microorganisms with the interior surfaces of wooden lambic barrels is limited. To clarify the role of casks and foeders as additional...
Environmental MicrobiologySurvival of Extremophilic Yeasts in the Stratospheric Environment during Balloon Flights and in Laboratory SimulationsStudies of eukaryotic microorganisms under conditions of astrobiological relevance, as well as the aerial dispersion potential of extremophilic yeasts, are still lacking in the literature compared to works with bacteria. Using stratospheric balloon flights and a simulation chamber, we demonstrate that yeasts isolated from an extreme environment are capable of surviving all stressors found in the stratosphere, including intense UV...
- Environmental MicrobiologyContribution of Microbial Activity to Carbon Chemistry in Clouds