MICHAEL ABBEY / SCIENCE PHOTO LIBRARY MICHAEL ABBEY / SCIENCE PHOTO LIBRARY
Yeast cells. Light micrograph, using phase contrast, of baker's or brewer'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. Phase contrasting reduces colour saturation but allows greater detail to be seen. Magnification x50 at 35mm size.
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