Sphaerotilus or Sphaerotilus natans is an aquatic periphyton organism associated with polluted water. It forms colonies commonly known as `sewage fungus`, but later identified as tightly sheathed filamentous bacteria. ==Morphology== Straight or smoothly curved filaments 1.5 µm in diameter and 100 to more than 500 µm in length are formed by rod.....
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http://en.wikipedia.org/wiki/Sphaerotilus
(from the article `bacteria`) ...into a floc that floats on the surface of liquid and keeps the bacteria exposed to air, a requirement for the metabolism of this genus. A few ...
Found on
http://www.britannica.com/eb/a-z/s/139
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