POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Yeast cells. Coloured scanning electron micrograph of baker's yeast, Saccharomyces cerevisiae. Yeast is a kind of single-celled fungus. It is able to ferment sugar, producing alcohol and carbon dioxide in the process. It has long been used to make beer and wine and in the baking of leavened bread (carbon dioxide causes the dough to rise). Medically, dried yeast is used as a source of vitamin B1, riboflavin and nicotinic acid. Yeast cells divide rapidly by budding off new cells or by reproducing sexually. Magnification x1600 at 6x4.5cm size.
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