ArticleOxygenation of Wort Availability of dissolved oxygen to yeast during the initial stage of fermentation is very important. Yeast use oxygen to build cell membrane components that are essential to replication. Unsaturated fatty acids, sterolsAlready a member? Log InWritten by Chris BibleYou'll Also Like Article FREE Fermenter Addition Basics . . . luckily for us, alcohol is lethally toxic to the vast majority of microorganisms found in our world. Article MEMBERS ONLY Insulation for Single Vessel Brewing What’s the best way to hold a consistent mash temperature for brew-in-a-bag brewing? We put the popular Reflectix insulation to the test.