Description of a new polymer-secreting bacterium from a deep-sea hydrothermal vent, Alteromonas macleodii subsp. fijiensis, and preliminary characterization of the polymer

Article Abstract:

A novel Alteromonas macleodii subspecies called fijiensis has been discovered in the fluid of a deep-sea hydrothermal vent. The bacteria is mesophilic, aerobic, heterotrophic, and gram-negative with a polar flagellum. The bacterium secretes a polysaccharide with a high molecular weight in the presence of glucose in the batch cultures. The viscosity of the polysaccharide is similar to that of xanthan. The polysaccharide contains glucose, mannose, pyruvated mannose, galactose, galacturonic acid, and glucuronic acid.

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Bacterial filament formation, a defense mechanism against flagellate grazing, is growth rate controlled in bacteria of different phyla

Article Abstract:

The interaction between Flectobacillus sp. strain MWH38 with Ochromonas sp. strain DS under chemostatic conditions. The former is a facultatively filamentous, grazing-protected freshwater bacterium while the latter is a bacterivorous flagellate. Results indicate that filament formation by the two bacteria is controlled by growth rate and occurs even in the presence of a predator. Flagellate grazing decreased bacterial biomass and indirectly stimulated filament formation.

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Identification of a Thiomicrospira denitrificans-like epsilonproteobacterium as a catalyst for autotrophic denitrification in the Central Baltic Sea

Article Abstract:

A newly developed approach consisting of molecular analyses was used to focus on autotrophic denitrification in the Central Baltic Sea. With this method, the bacteria responsible for autotrophic denitrification as a single taxon, an epsilonproteobacterium related to the autotrophic denitrified Thiomicrospira denitrificans was identified.

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