2101022D

2101022D
Caption: Vibrio fischeri - Gram-negative, motile, bioluminescent, curved rod-shaped bacterium (prokaryote). Vibrio fischeri is a bioluminescent bacterium that occurs in global ocean environments. It moves by means of flagella. Free living V. fischeri survive on decaying organic matter. V. fischeri is found in higher concentrations in symbiotic relationships with certain deep sea marine life within special light-organs. One such symbiotic relationship is with the bob-tailed squid. V. fischeri causes the squid to produce a mucus substance that is secreted below the light organ on the squid. Cilia are used to draw more bacteria into this mucus matrix. The bacteria migrate into the light organ and colonize an area within it. They provide a light source for the squid to make it blend in with the ocean floor at night. Thus predators have a hard time seeing the squid. V. fischeri is a key research organism for examination of microbial bioluminescence, quorum sensing, and bacterial-animal symbiosis.
Magnification*: x8,000
Type: SEM
Copyright 2010 Dennis Kunkel Microscopy, Inc.
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