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Lec4W11 - Vibrio fischeri Bioluminescent bacteria that is a...

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Vibrio fischeri Bioluminescent bacteria that is a symbiot of certain species of squids and fishes Vibrio colonize pouches known as light organs It is believed that the light produced by Vibrio erase the shadow that would normally produced by the squid at night The squid, in turn, provides a source of nutrients for the bacteria
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b. An Australian pinecone fish (12 cm long). The red organ on the lower jaw is a light organ that contains 10 10 V. fischeri cells per ml fluid. The light organ appears red in this photograph because the light-organ tissue is highly vascularized. Australian pinecone fish are nocturnal reef dwellers and they use the light organ to search for prey at night. c. A Hawaiian bobtail squid. This adult squid is 2 cm long. There is a V. fischeri light organ close to the ink sac within the mantle cavity of the animal. This light organ contains 10 11 V. fischeri cells per ml. These nocturnal squid emit light downwards through the mantle cavity and, by matching the intensity of the moon- and starlight above, they become invisible to predators below them. Images b and c kindly provided by Edward G. Ruby (University of Hawaii, USA From Nature Reviews Molecular Cell Biology 3, 685-695 (September 2002)
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