DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Yeast cells. Coloured Scanning Electron Micrograph (SEM) of yeast cells, Saccharomyces cerevisiae. This fungus, also known as Baker's or Brewer's yeast, consists of single vegetative cells. Some cells can be seen dividing by budding off new cells. Saccharomyces cerevisiae ferments sugar, producing alcohol and carbon dioxide in the process. It has long been used in brewing beer, the production of wine and in baking leavened bread (carbon dioxide causes the dough to rise). Medically, dried Baker's yeast is used as a rich source of vitamin B1, riboflavin and nicotinic acid. Magnification: x125 at 6x7cm size.
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