Lecture

Methane Cycling and Acetogenesis

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In course

ENV-202: Microbiology for engineers

"Microbiology for engineers" covers the main microbial processes that take place in the environment and in treatment systems. It presents elemental cycles that are catalyzed by microorganisms and that have a major impact on planet Earth. ...

Description

This lecture covers metabolic diversity, focusing on methane cycling and acetogenesis. It explains the energy generation by methanotrophy, the pathways for carbon assimilation by methanotrophs, and the key enzymes involved in these processes. Additionally, it discusses the competition between acetogenesis and methanogenesis, the role of acetogens in the acetyl-coA pathway, and the different electron donors used in strictly anaerobic conditions.

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Instructors (4)

Christof Holliger

Expertise BioremediationWastewater treatmentAnaerobic digestionBiogas and biofuelEnvironmental microbiologyMicrobial Ecology Teaching & PhD Past EPFL PhD Students Doulaye Koné, Katia Szynalski, Karin Kaufmann, Christian Balsiger, Julien Maillard, Enrique Lara, Benoît Zen-Ruffinen, François-Nicolas de Glutz, Laure Prat, Noam Shani, Samuel Lochmatter, David Gregory Weissbrodt, Elsa Marina Lacroix, Aamani Rupakula Boyanapalli, Géraldine Florence Buttet, Aline Sondra Adler, Mathilde Stéphanie Willemin, Lorenzo

Julien Maillard

2011 - present: Research associate at the Laboratory for Environmental Biotechnology (LBE, IIE-ENAC, EPFL) 2007 - 2010: Postdoctoral Fellow at the Laboratory for Environmental Biotechnology (LBE, IIE-ENAC, EPFL) 2005 - 2006: Postdoctoral Fellow at the University of East Anglia (UEA, Norwich, UK) 2000 - 2004: PhD thesis at the Laboratory for Environmental Biotechnology (LBE) 1995 - 2000: B.sc & M.sc at the Swiss Federal Institute for Technology, Zurich (ETHZ)

Rizlan Bernier-Latmani

HIGHER EDUCATION Summer course: Advances in Genome Technology and Bioinformatics Course at the Marine Biology Laboratory in Woods Hole, MA. October 2005. Ph.D. 2001 Civil and Environmental Engineering, Stanford University, CA (Advisor, Jim Leckie, Biodegradation of uranyl (UO22 )-complexed citrate and implications for uranyl mobility in the subsurface) M.S. 1995 Civil and Environmental Engineering, Stanford University, CA B.S. 1993 Natural Resources with Honors, Cornell University, Ithaca, NY PROFESSIONAL EMPLOYMENT 2013-present Associate professor with tenure, School of Architecture, Civil and Environmental Engineering, Swiss Federal Institute of Technology, Lausanne 2005-2013 Assistant professor tenure track, School of Architecture, Civil and Environmental Engineering, Swiss Federal Institute of Technology, Lausanne 2001-2005 Post-Graduate Researcher, Scripps Institution of Oceanography, La Jolla, CA (PI: Brad Tebo) 1995-2001 Graduate Research Assistant, Stanford University (Advisor: Jim Leckie) RESEARCH INTERESTS Gemicrobiology, metal-bacteria interactions, biological reduction and oxidation of metals, biological nanoparticle formation; Characterization of microbial communities in terrestrial environments; Using genomic, microscopic and spectroscopic tools to understand metal transformations by microorganisms. ACADEMIC HONORS Rotary Foundation University Professor grant, 2004. Swiss National Science Foundation Post-doctoral Fellowship, 2001. Leon B. Reynolds Memorial Scholarship in the School of Engineering at Stanford University, 1995-96. Graduated with Honors from Cornell University, 1993. BIBLIOMETRY http://www.researcherid.com/rid/E-4398-2011 ResearcherID: E-4398-2011

Official source

Ontological neighbourhood

Biology

Cell biology: Cell metabolism

Related concepts (32)

Methanogen

Methanogens are microorganisms that produce methane as a metabolic byproduct in hypoxic conditions. They are prokaryotic and belong to the domain Archaea. All known methanogens are members of the archaeal phylum Euryarchaeota. Methanogens are common in wetlands, where they are responsible for marsh gas, and in the digestive tracts of animals such as ruminants and many humans, where they are responsible for the methane content of belching in ruminants and flatulence in humans.

Syntrophy

In biology, syntrophy, synthrophy, or cross-feeding (from Greek syn meaning together, trophe meaning nourishment) is the phenomenon of one species feeding on the metabolic products of another species to cope up with the energy limitations by electron transfer. In this type of biological interaction, metabolite transfer happens between two or more metabolically diverse microbial species that live in close proximity to each other. The growth of one partner depends on the nutrients, growth factors, or substrates provided by the other partner.

Anaerobic organism

An anaerobic organism or anaerobe is any organism that does not require molecular oxygen for growth. It may react negatively or even die if free oxygen is present. In contrast, an aerobic organism (aerobe) is an organism that requires an oxygenated environment. Anaerobes may be unicellular (e.g. protozoans, bacteria) or multicellular. Most fungi are obligate aerobes, requiring oxygen to survive. However, some species, such as the Chytridiomycota that reside in the rumen of cattle, are obligate anaerobes; for these species, anaerobic respiration is used because oxygen will disrupt their metabolism or kill them.

Methanotroph

Methanotrophs (sometimes called methanophiles) are prokaryotes that metabolize methane as their source of carbon and chemical energy. They are bacteria or archaea, can grow aerobically or anaerobically, and require single-carbon compounds to survive. Methanotrophs are especially common in or near environments where methane is produced, although some methanotrophs can oxidize atmospheric methane. Their habitats include wetlands, soils, marshes, rice paddies, landfills, aquatic systems (lakes, oceans, streams) and more.

Anaerobic digestion

Anaerobic digestion is a sequence of processes by which microorganisms break down biodegradable material in the absence of oxygen. The process is used for industrial or domestic purposes to manage waste or to produce fuels. Much of the fermentation used industrially to produce food and drink products, as well as home fermentation, uses anaerobic digestion. Anaerobic digestion occurs naturally in some soils and in lake and oceanic basin sediments, where it is usually referred to as "anaerobic activity".

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