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Shewanella violacea DSS12 ( S. violacea ) is a gram-negative bacterium located in marine sediment in the Ryukyu Trench at a depth of 5,110 m. The first description of this organism was published in 1998 by Japanese microbiologist s Yuichi Nogi , Chiaki Kato , and Koki Horikoshi , who named the species after its violet appearance when it is grown on Marine Agar 2216 Plates .
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