Soehngenia

Soehn.ge'ni.a. N.L. fem. n. Soehngenia named in honor of Nicolas L. Soehngen, founder and first head (1911–1937) of the Laboratory of Microbiology of Wageningen University, The Netherlands, where this strain was isolated and described. Firmicutes / “Clostridia” / Clostridiales / incertae Sedis ‐ Family I / Soehngenia Rod‐shaped cells , 0.5–0.7 × 2–11 µm (Figure 1). Gram‐stain‐positive . In the early exponential phase of growth, cells are slightly motile by means of peritrichous flagella (Figure 2); older cells lose their motility. Colonies are rhizoid, resemble a snowflake, dark, and creamy. Rare terminal and subterminal spore formation. Mesophilic . Anaerobic, but aerotolerant ; it can grow with 50% air in the gas phase. Fixes molecular nitrogen. Chemo‐organotrophic . Saccharolytic and weakly proteolytic. Growth substrates are a wide range of carbohydrates and some other carbon sources, including yeast extract, cysteine, and serine. Isolated from a laboratory anaerobic digester sludge with benzaldehyde as the substrate. DNA G + C content ( mol %): 43.0 ( T m ). Type species : Soehngenia saccharolytica Parshina, Kleerebezem, Sanz, Lettinga, Nozhevnikova, Kostrikina, Lysenko and Stams 2003, 1797 VP .