Abstract
From estuarine mud a rod-shaped, motile, gram-negative, anaerobic bacterium was isolated (strain asp 66). Asp 66 fermented several substrates including glucose, fructose, malate, fumarate, citrate and aspartate. Fermentation products were acetate, propionate and presumably CO2. Hydrogen was never formed nor utilized. Succinate conversion to propionate was catalyzed by cell suspensions but did not support growth. Asp 66 did not require vitamins and grew well in mineral media with a fermentable substrate. The pH range for growth was from 6.5 to 8.5. Temperature optimum was 27 to 30°C. The strain was able to fix N2 as evidenced by its growth with N2 as sole nitrogen source and its ability to reduce acetylene to ethylene. Cell-free extracts of cultures grown under air without shaking contained cytochrome(s) with absorption peaks at 523 nm and at 553 nm. The G+C content of the DNA was 60.8+-1 mol%. The taxonomic position of strain asp 66 is discussed.
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Hansen, T.A., Nienhuis-Kuiper, H.E. & Stams, A.J.M. A rod-shaped, gram-negative, propionigenic bacterium with a wide substrate range and the ability to fix molecular nitrogen. Arch. Microbiol. 155, 42–45 (1990). https://doi.org/10.1007/BF00291272
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DOI: https://doi.org/10.1007/BF00291272