Metamenu

  • Centre for Microbiology and Environmental Systems Science

  • CUBE - Computational Systems Biology

  • DOME - Microbial Ecology

  • EDGE - Environmental Geosciences

  • TER - Terrestrial Ecosystem Research

News

Latest publications

Sorption of organic substances to tire wear materials: Similarities and differences with other types of microplastic

Tire materials are a significant proportion of the (micro)plastics in the environment that until today have been clearly overlooked. These materials are released into the environment, either unintentionally as an abrasion product from tire wear, that reaches the environment via road runoff, or intentionally as, for example, shredded “tire crumble rubber” used as filling material for playgrounds. Although there are a few estimates available the amount of tire-wear material to be found in aquatic environments, investigations on the fate tire materials and especially their interaction with organic substances are missing. Although the sorption processes associated with the complex constituents of tires are an important aspect of any environmental risk assessment for tire-wear materials, they have yet to be thoroughly investigated. In this review we elucidate the sorption properties of the polymeric rubbers and carbon black that form the main components of tires, within the context of current microplastic research.

Thorsten Hüffer, Stephan Wagner, Thorsten Reemtsma and Thilo Hofmann
2019 - Trends in Analytical Chemistry, 113: 392-401

An automated Raman-based platform for the sorting of live cells by functional properties

Stable-isotope probing is widely used to study the function of microbial taxa in their natural environment, but sorting of isotopically labelled microbial cells from complex samples for subsequent genomic analysis or cultivation is still in its early infancy. Here, we introduce an optofluidic platform for automated sorting of stable-isotope-probing-labelled microbial cells, combining microfluidics, optical tweezing and Raman microspectroscopy, which yields live cells suitable for subsequent single-cell genomics, mini-metagenomics or cultivation. We describe the design and optimization of this Raman-activated cell-sorting approach, illustrate its operation with four model bacteria (two intestinal, one soil and one marine) and demonstrate its high sorting accuracy (98.3 ± 1.7%), throughput (200–500 cells h−1; 3.3–8.3 cells min−1) and compatibility with cultivation. Application of this sorting approach for the metagenomic characterization of bacteria involved in mucin degradation in the mouse colon revealed a diverse consortium of bacteria, including several members of the underexplored family Muribaculaceae, highlighting both the complexity of this niche and the potential of Raman-activated cell sorting for identifying key players in targeted processes.

Lee KS, Palatinszky M, Pereira FC, Nguyen J, Fernandez VI, Mueller AJ, Menolascina F, Daims H, Berry D, Wagner M, Stocker R
2019 - Nat Microbiol, in press

Vertical Redistribution of Soil Organic Carbon Pools After Twenty Years of Nitrogen Addition in Two Temperate Coniferous Forests

Nitrogen (N) inputs from atmospheric deposition can increase soil organic carbon (SOC) storage in temperate and boreal forests, thereby mitigating the adverse effects of anthropogenic CO2 emissions on global climate. However, direct evidence of N-induced SOC sequestration from low-dose, long-term N addition experiments (that is, addition of < 50 kg N ha−1 y−1 for > 10 years) is scarce worldwide and virtually absent for European temperate forests. Here, we examine how tree growth, fine roots, physicochemical soil properties as well as pools of SOC and soil total N responded to 20 years of regular, low-dose N addition in two European coniferous forests in Switzerland and Denmark. At the Swiss site, the addition of 22 kg N ha−1 y−1 (or 1.3 times throughfall deposition) stimulated tree growth, but decreased soil pH and exchangeable calcium. At the Danish site, the addition of 35 kg N ha−1 y−1 (1.5 times throughfall deposition) impaired tree growth, increased fine root biomass and led to an accumulation of N in several belowground pools. At both sites, elevated N inputs increased SOC pools in the moderately decomposed organic horizons, but decreased them in the mineral topsoil. Hence, long-term N addition led to a vertical redistribution of SOC pools, whereas overall SOC storage within 30 cm depth was unaffected. Our results imply that an N-induced shift of SOC from older, mineral-associated pools to younger, unprotected pools might foster the vulnerability of SOC in temperate coniferous forest soils.

Forstner, SJ, Wechselberger V, Müller S, Keiblinger KM, Díaz-Pinés E, Wanek W, Scheppi P, Hagedorn F, Gundersen P, Tatzber M, Gerzabek MH, Zechmeister-Boltenstern S
2019 - Ecosystems, 22: 379-400

Lecture series

Is metabolic cooperation within microbial communities inevitable?

Christian Kost
University Osnabrück
11.04.2019
12:00 h
Lecture Hall HS2, UZA1, Althanstrasse14, 1090 Vienna

Environmental redox-processes on the microscale - redox-active biofilms analyzed by modern X-ray microscopy

Prof. Dr. Martin Obst
BayCEER, University of Bayreuth, Germany
20.05.2019
16:30 h
Eberhard Clar-Saal (2B 204), Althanstrasse 14 UZA II, 1090 Vienna

Mining sequence data — GTDB taxonomy

Phil Hugenholtz
Australian Center for Ecogenomics, University of Queensland, Brisbane, Australia
20.05.2019
18:00 h
Aula, Campus of the University of Vienna, Vienna, Austria