JOHN WALSH / SCIENCE PHOTO LIBRARY JOHN WALSH / SCIENCE PHOTO LIBRARY
Light micrograph (phase contrast) of Lactobacillus bulgaricus bacteria, taken from live yoghurt. The relatively long, Gram-positive bacteria appear as thin, black rods. They are commonly found among the normal human internal flora in places such as the stomach, gut, mouth & vagina. Lactobacillus produces lactic acid from the fermentation of carbohydrates. This acidic environment, notably in the vagina, protects the host by inhibiting the growth & replication of other more pathogenic bacteria. Magnification: x400 at 35mm size.
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