Programm (PDF)Kolloquiums-Mailingliste für Interessierte / Hinweise für Vortragende / Hinweise für Einladende (PDF, intern)
Aufgrund der COVID-19 Pandemie ist eine Teilnahme vor Ort nicht möglich. Hier können Sie den Vortrag im Live-Stream (Zoom) verfolgen.

Vortragsreihe Ökologie und Umweltforschung SS 2016

Donnerstag 12:00-13:30 H6, Geo

Dr. Michael Sander
Environmental Chemistry, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, Switzerland (Homepage)
Donnerstag, 28.04.2016 12:00-13:30 H6, GEO:

Fate of biodegradable polyesters in agricultural soils - from enzymatic hydrolysis to microbial uptake and mineralization

The accumulation of persistent synthetic organic polymers in the environment has become a major environmental concern. Replacing these materials by biodegradable polymers in specific application areas may help to alleviate this problem. Among these areas are agricultural practices that heavily rely on the use of plastics (i.e., ‘plasticulture’). This contribution focuses on assessing the factors that govern the biodegradation of aliphatic polyesters, composed of alternating units of dialcohols and dicarboxylic acids, in agricultural soils. The contribution has three successive parts that target three key processes involved in polyester biodegradation. The first part focuses on enzymatic polyester hydrolysis, which is commonly considered the rate-limiting step in the overall biodegradation of these materials in soils. Two novel experimental approaches are presented and used to systematically study the hydrolysis of a series of structurally related aliphatic polyesters by two isolated esterases under well-controlled laboratory conditions. The enzymatic hydrolysis rates increased as the melting temperatures of the aliphatic polyesters decreased, strongly suggesting that the flexibility of the polyester backbone and hence its propensity to enter the active sites of the esterases governed hydrolysis rates. The second part focuses on the mineralization dynamics of a selected, 13C-labeled aliphatic polyester, polybutylene succinate, in an agricultural soil under laboratory conditions. While the two monomers that compose this polyester, 1,4-butanediol and succinic acid, mineralized over a relatively short time (hours to days) and in a position-specific manner, the mineralization of polybutylene succinate was slower (timeframe of weeks to months) and showed only a slight dependence on the monomer position at which the polymer was labeled. These findings are consistent with overall mineralization rates in soils being governed by the rates of enzymatic depolymerization of the bulk polyester and, hence, the rates at which mono- and oligomers are released from the polymer surface to become available to soil microorganisms. The third part addresses the colonization of polyester film surfaces by soil fungi and unicellular microorganisms as well as the uptake of polymeric carbon into microbial biomass using a combination of surface imaging techniques. The collected images unequivocally demonstrate that polymeric carbon is incorporated into microbial biomass. Furthermore, the images suggest that fungal hyphae play a key role in polyester degradation. The novel insights into polyester biodegradation will be summarized and will serve to provide a brief outlook to future work on the fate of biodegradable polymers in soils and other environmental systems.


Invited by Stefan Peiffer, Hydrology

Weitere Informationen:Export as iCal: Export iCal
zurück zur Liste
14.04.2016Prof. Otmar Urban
Division of Impact Studies and Ecophysiological Analyses, CzechGlobe, Czech Academy of Sciences, Brno, CZ
Plant responses to climate change: impacts and adaptation [Abstract]
21.04.2016Dr. Florian R.Storck
DVGW-Technologiezentrum Wasser, Karlsruhe
Mikroplastik in Wasserressourcen – Anforderungen an die Analytik und erste Ergebnisse [Abstract]
S 21, GEO-Gebäude
Dr. Jana Bürger
Department Crop Health, Rostock University
Arable weeds under climate and land-use change – how ecological methods help agricultural researchers [Abstract]
28.04.2016Dr. Michael Sander
Environmental Chemistry, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, Switzerland
Fate of biodegradable polyesters in agricultural soils - from enzymatic hydrolysis to microbial uptake and mineralization [Abstract]
12.05.2016Prof. Jon Petter Gustafsson
Soil and Groundwater Chemistry, KTH Stockholm / SLU Uppsala
Speciation and bioavailability of trace metals and phosphorus in soil systems [Abstract]
02.06.2016Dr. Christine M. Klapeer
Entwicklungssoziologie, Universität Bayreuth
Ist Natur politisch? Zum Zusammenhang von Naturkonzeptionen, Geschlechterverhältnissen und kolonialer Gewalt [Abstract]
09.06.2016Dr. Julian Klaus
Catchment and Eco-Hydrology Research Group, Luxembourg Institute of Science and Technology
Stable Isotopes in Hydrology: Progress in concepts and process understanding [Abstract]
16.06.2016Freek T. Bakker (PhD)
Biosystematics Group, Wageningen University, NL
Herbarium genomics, skimming & plastomics [Abstract]


Symposium zur Besetzung der W3-Professur Bodenphysik [Abstract]
PD Dr. Karsten Wesche
Dept. of Botany, Senckenberg Museum of Natural History Görlitz
Climate controls override grazing effects under extreme conditions of Central Asia [Abstract]
30.06.2016Prof. Dr. Andreas Lang
Geomorphology and Environmental Systems, University of Salzburg, AT
The Anthropocene - is there a case for a new geological epoch? [Abstract]
21.07.2016Dr. Marie Spohn
Soil Biogeochemistry, Soil Ecology, BayCEER, University of Bayreuth
Biogenic Weathering [Abstract]
Terminplanung und Vortragsarchiv BayCEER Kolloquium (seit 2008) sowie Geoökologisches Kolloquium (ab 2001)
Aktuelle Termine

Do. 28.01.2021
BayCEER Mitgliederversammlung
Do. 15.04.2021
- folgt -
Do. 22.04.2021
- folgt -
Do. 29.04.2021
- folgt -
Ökologisch-Botanischer Garten:
Do. 11.02.2021
Online-Veranstaltung: Mit dem Kanu durch den Regenwald. Eine Expedition in die Überschwemmungswälder Süd-Venezuelas
BayCEER Blog
Why Science Communication?
Stoichiometric controls of C and N cycling
Flying halfway across the globe to dig in the dirt – a research stay in Bloomington, USA
Picky carnivorous plants?
RSS Blog als RSS Feed
Wetter Versuchsflächen
Luftdruck (356m): 961.5 hPa
Lufttemperatur: -1.4 °C
Niederschlag: 0.1 mm/24h
Sonnenschein: 7 h/d
Wind (Höhe 17m): 2.7 km/h
Wind (Max.): 6.1 km/h
Windrichtung: SO

Globalstrahlung: 44 W/m²
Wind (Höhe 32m): 0.0 km/h

Diese Webseite verwendet Cookies. weitere Informationen