medium-preparation-for-cultivation-microorganisms-under-strictly

Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions

In contrast to aerobic organisms, strictly anaerobic microorganisms require the absence of oxygen and usually a low redox potential to initiate growth. As ...

Universität Innsbruck

Although Methanosarcinales are versatile concerning their methanogenic substrates, the ability of  to use carbon dioxide (CO) for catabolic and anabolic metabolism was not proven until now. Here, we show that  used CO to perform hydrogenotrophic methanogenesis in the presence as well as in the absence of methanol. During incubation with hydrogen, the methanogen utilized the substrates methanol and CO consecutively, resulting in a biphasic methane production. Growth exclusively from CO occurred slowly but reproducibly with concomitant production of biomass, verified by DNA quantification. Besides verification through multiple transfers into fresh medium, the identity of the culture was confirmed by 16s RNA sequencing, and the incorporation of carbon atoms from CO into CH molecules was measured to validate the obtained data. New insights into the physiology of  can serve as reference for genomic analyses to link genes with metabolic features in uncultured organisms.

Hydrogenotrophic Methanogenesis and Autotrophic Growth of .

With regard to social and environmental sustainability, second-generation biofuel and biogas production from lignocellulosic material provides considerable potential, since lignocellulose represents an inexhaustible, ubiquitous natural resource, and is therefore one important step towards independence from fossil fuel combustion. However, the highly heterogeneous structure and recalcitrant nature of lignocellulose restricts its commercial utilization in biogas plants. Improvements therefore rely on effective pretreatment methods to overcome structural impediments, thus facilitating the accessibility and digestibility of (ligno)cellulosic substrates during anaerobic digestion. While chemical and physical pretreatment strategies exhibit inherent drawbacks including the formation of inhibitory products, biological pretreatment is increasingly being advocated as an environmentally friendly process with low energy input, low disposal costs, and milder operating conditions. Nevertheless, the promising potential of biological pretreatment techniques is not yet fully exploited. Hence, we intended to provide a detailed insight into currently applied pretreatment techniques, with a special focus on biological ones for downstream processing of lignocellulosic biomass in anaerobic digestion.

Article	Year
Hydrogenotrophic Methanogenesis and Autotrophic Growth of . Archaea (Vancouver, B.C.)\| PubMed ID: 30123085	2018
Biological Pretreatment Strategies for Second-Generation Lignocellulosic Resources to Enhance Biogas Production. Energies\| PubMed ID: 30881604	2018

Nina Lackner

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