Availability of Oxygen-The degree of anaerobiosis is a principal factor controlling fermentations. with yeasts. when large amounts of oxygen are present, yeast cell production is promoted.
人类通过研究,作为好奇而得到的产物,已开发了一批控制自然过程的系统。中之一是通过控制(也包括促进)微生物的生长来保藏食物。