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Sulfolobus. Image provided by Mark Young and Sue Brumfield, Montana State University. Thin sections photographed using an electron microscope and subsequently been colourised.
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This bacterium occurs in very large numbers and gives certain regions of water deriving from the spring a very bright red colour. The colour comes from the rhodopsin pigment. Phase contrast microscopy.
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This image is of a small sample from a region of water that had a bright red colour. The rod shaped bacteria are the Halobacterium, but other species are present. The small refractile globules are sulphur droplets. Phase contrast microscopy.