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Kefir bacteria, SEM

Kefir bacteria, SEM

C037/4530

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Credit

STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY

Caption

Kefir bacteria. Scanning electron micrograph (SEM) of Lactobacillus (brown) and Lactococcus bacteria from kefir, a fermented milk beverage containing beneficial yeast as well as probiotic bacteria. Lactic acid bacteria produce lactic acid from the milk sugar lactose. The acid coagulates the milk. Yeasts produce carbon dioxide and a low concentration of ethanol (alcohol). Kefir thus tastes somewhat like an acidic carbonated drink. Magnification: x7000 when printed at 10 centimetres wide.

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