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Lecture series in Ecology and Environmental Research WS 2015/16

Thursday 12:00-13:30 H6, Geo


Dr. Lucian Staicu
University of Franche-Comté, Department of Science and Technology, Besançon, France (Homepage)
Wednesday, , 07.10.2015 10:00-11:30 Room 204, 2. floor/Geo III:

Bacterial metabolism of selenium. Survival or profit?

Bacteria are involved in the redox transformations of selenium (Se) contributing to the biogeochemical cycle of this chalcogen element. The metabolism of Se by bacteria follows several basic strategies which include (1) cellular energy production coupled to oxidation/reduction reactions, (2) satisfying a trace element requirement for nutrition, and (3) detoxification processes.
Se has four oxidation states, (+VI), (+IV), (0) and (-II), that are commonly observed in biology. Se oxyanions, selenate (Se[VI], SeO42-) and selenite (Se[IV], SeO32-) are water soluble and toxic but a number of bacteria can reduce them to elemental Se, Se(0), either as a detoxification response or to generate energy by using the oxyanions as final electron acceptors. Se(0) is insoluble and shows a lower toxicological potential, however it exhibits colloidal properties that contribute to its environmental persistence. The microbial-mediated reduction of Se can proceed down to selenides, Se(-II), both for the production of Se-containing molecules (e.g. selenoproteins) in an assimilatory fashion and to detoxify Se in the form of methylated chemical species. Bacterial oxidation of lower valance states of Se has also been documented but the reaction rates are several orders of magnitude lower than the reductive side of the cycle.
To achieve the Se metabolic activities, numerous unique enzymes are employed. While some enzymes from the selenium cycle have been isolated and are markedly specific for Se, many of the Se enzymes remain to be isolated. An understanding of selenium metabolism is complicated by the observations that enzymes from sulfur or nitrogen metabolism may also recognize selenium compounds. From a biotechnological perspective, Se resistant bacteria can be employed in a variety of applications ranging from Se-laden wastewater treatment (i.e. bioremediation) to the production of semiconductor quantum dots.



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DatelecturerTitle
Wednesday
Room 204, 2. floor/Geo III
10:00-11:30
07.10.2015
Dr. Lucian Staicu
University of Franche-Comté, Department of Science and Technology, Besançon, France
Bacterial metabolism of selenium. Survival or profit? [Abstract]
15.10.2015Prof. Dr. Werner Härdtle
Landscape Ecology and Nature Conservation, University of Lüneburg
Global change impacts on ecosystem functions – the importance of interactive effects [Abstract]
22.10.2015Prof. Declan Kennedy
formerly Chair of Urban Design, Dept. of Architecture, TU Berlin
The New Story Movement and Sustainability [Abstract]
Friday
H27, GW II
09:00-16:00
23.10.2015
- siehe Aushänge -
Berufungsvorträge zur W3-Professur Sportökologie [Abstract]
Wednesday
H36, NW III
15:15-16:45
28.10.2015
Dr. Lars Markesteijn
Community Ecology Research Oxford, University of Oxford, UK / Smithsonian Tropical Research Institute, Panama
What determines biological diversity? [Abstract]
29.10.2015Dr. Sergio Calabrese
Università degli Studi di Palermo; Department of Earth and Marine Science (DiSTeM); Italy
Environmental impact of volcanic emissions [Abstract]
12.11.2015Dr. Dylan James Craven
German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig
Biodiversity effects on ecosystem stability following climate extremes [Abstract]
19.11.2015Dr. Christoph Schmidt
Geomorphology, BayCEER, University of Bayreuth
Of trapped electrons and their relevance in tracing landscape evolution and human history [Abstract]
26.11.2015Dr. Derek Persoh
Institute for Evolution and Biodiversity of Plants, Ruhr-University of Bochum
Fungal community structure and function - from current knowledge towards predictability [Abstract]
Friday
H10, NW I
14:15-15:45
27.11.2015
Prof. Dr. Alexandra-Maria Klein
Naturschutz und Landschaftsökologie, Albert-Ludwigs-Universität Freiburg
Functional diversity, complementarity and trait identity in pollination studies [Abstract]
03.12.2015Dr. Harald Pauli
Department of Conservation Biology, Vegetation and Landscape Ecology Institute of Ecology and Conservation Biology University of Vienna
Past and recent changes in European alpine plant diversity: increases, declines, stagnations and accelerations driven by climate change [Abstract]
10.12.2015Dr. Severin Irl
Biogeography, BayCEER, University of Bayreuth
Plant diversity on high-elevation islands – drivers of species richness and endemism [Abstract]
13:00-14:30
14.01.2016
Prof. Dr. Johannes Kollmann
Restoration Ecology, TUM, Freising
Transformation of grasslands in South Brazil - effects of changing land use on biodiversity and ecosystem functions [Abstract]
21.01.2016Dr. Marie Spohn
Soil Ecology, BayCEER, University of Bayreuth
Organic phosphorus mineralization and microbial carbon allocation in soil [Abstract]
28.01.2016
BayCEER Mitgliederversammlung [Abstract]
Friday
Dr.-Hans-Frisch-Str. 1-3, Raum H7 (Bibliothek)
13:00-14:30
29.01.2016
PD Dr. Reinhard Well, Dr. Lena Rohe
Institut für Agrarklimaschutz, Johann Heinrich von Thünen Institut
Advanced stable isotope tracing and natural abundance methods to unravel N-cycling processes
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