False-colour scanning electron micrograph of the bacteria Lactobacillus bulgaricus, taken from live yoghurt. They are rod-shaped, gram-positive bacteria. They grow in acid media & produce lactic acid from the fermentation of carbohydrates. Lactic acid produced by the fermentation of milk is responsible for the preservation & flavour of cheese, yoghurt & other fermented milk products. The bacteria are found in fermenting animal & plant products & in the alimentary tract & vagina of humans & other animals, where they serve a protective role against more dangerous bacteria. Magnification: x2,200 at 6x4.5cm size.
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TOP10166348
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達志影像
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RM
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