Microbial utilization of electrically reduced neutral red as the sole electron donor for growth and metabolite production

Article Abstract:

The strict anaerobic bacteria methanogen has been found to freely couple with H2 or HCOOH oxidation to CO2 reduction to produce methane, thus enabling methanogenesis to pair with less free energy as compared to other anaerobic respiration processes. An experiment involving the use of electrically neutral red has revealed its usefulness as the lone source of reducing power for growth and metabolism of pure and mixed cultures of H2-consuming bacteria in a novel electrochemical bioreactor system.

Microbial metabolism, Anaerobic bacteria, Methanobacteriaceae, Methanogens

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Identification of geosmin as a volatile metabolite of Penicillum expansum

Article Abstract:

Penicillum expansum is one of the causative agents of postharvest losses in apples, pears and cherries and is characterized by the production of a musty, earthy odor. An investigation was conducted to determine the substance responsible for this distincive odor as an initial step for early detection of decay. Gas chromatographic and mass spectrometric analyses showed that geosmin is the primary substance eliciting the distinctive odor caused by P. expansum-caused fruit decay.

Identification and classification, Fruit, Fruits (Food), Diseases and pests, Odors

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Geosmin and related volatiles in bioreactor-cultured Streptomyces citreus CBS 109.60

Article Abstract:

Streptomyces citreus CBS 109.60 produces major amounts of geosmin and germacradienol and smaller amounts of other volatile compounds during cultivation in a bioreactor. Qualitative and quantitative analyses with capillary gas chromatography and mass spectroscopy indicate the presence of 56 volatile substances. The compounds are terpenoids, aliphatic ketones, esters, alcohols and pyrazines. A probable biosynthetic pathway for geosmin is discussed.

Analysis, Streptomyces

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