Useful Microorganism - Yeast
what is meant by yeast ? y Yeasts are eukaryotic , single-celled microorganisms classified as members of the fungus kingdom . The first yeast originated hundreds of millions of years ago, and at least 1,500 species are currently recognized. Yeast growth : Yeasts are non-pathogenic and are very easy to work with 4 . Yeasts can be grown in chemical-defined media both in liquid culture and on solid agar. Both Saccharomyces cerevisiae and Schizosaccharomyces pombe can grow optimally at 30°C with an average doubling time of 90 – 120 minutes. However, they also can grow at temperatures as low as 16°C and as high as 42°C. In between usage, yeast can be stored in 10% glycerol at -80°C freezer for years. The Structure of a Yeast Cell The Role Of Yeast In Fermentation Process 2.1. Alcoholic Fermentations The production of alcoholic beverages from fermentable carbo...