A5063065625- Microbial Community Ecology and Physiology
- Genomics and Phylogenetic Studies
- Methane Hydrates and Related Phenomena
- Wastewater Treatment and Nitrogen Removal
- Marine Biology and Ecology Research
- Protist diversity and phylogeny
- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Anaerobic Digestion and Biogas Production
- Coral and Marine Ecosystems Studies
- Marine Bivalve and Aquaculture Studies
- Microbial metabolism and enzyme function
- Hydrocarbon exploration and reservoir analysis
- Algal biology and biofuel production
- Indigenous Studies and Ecology
- Microbial infections and disease research
- Atmospheric and Environmental Gas Dynamics
- Bacteriophages and microbial interactions
- RNA and protein synthesis mechanisms
- Chemical Analysis and Environmental Impact
- Polar Research and Ecology
- Bacillus and Francisella bacterial research
- Bacterial Genetics and Biotechnology
- Ammonia Synthesis and Nitrogen Reduction
- Microbial Fuel Cells and Bioremediation
Bielefeld University
2011-2022
AgResearch
2022
Max Planck Institute for Marine Microbiology
2011-2021
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2015-2019
Max Planck Society
2015
University of Veterinary Medicine Hannover, Foundation
2007-2009
In the biogeochemical nitrogen cycle, microbial respiration processes compete for nitrate as an electron acceptor. Denitrification converts into nitrogenous gas and thus removes fixed from biosphere, whereas ammonification ammonium, which is directly reusable by primary producers. We combined multiple parallel long-term incubations of marine nitrate-respiring communities with isotope labeling metagenomics to unravel how specific environmental conditions select either process. Microbial...
METHODS article Front. Microbiol., 05 December 2012Sec. Microbial Physiology and Metabolism Volume 3 - 2012 | https://doi.org/10.3389/fmicb.2012.00410
Microbial communities of the Arctic Ocean are poorly characterized in comparison to other aquatic environments as their horizontal, vertical, and temporal turnover. Yet, recent studies showed that marine ecosystem harbors unique microbial community members adapted harsh environmental conditions, such near-freezing temperatures extreme seasonality. The gene for small ribosomal subunit (16S rRNA) is commonly used study taxonomic composition natural environment. Several primer sets this marker...
The anaerobic oxidation of methane (AOM) is mediated by consortia methane-oxidizing archaea (ANME) and their specific partner bacteria. In thermophilic AOM enriched from Guaymas Basin, members the ANME-1 clade are associated with bacteria HotSeep-1 cluster, which likely perform direct electron exchange via nanowires. bacterium was hydrogen as sole donor sulfate acceptor. Based on phylogenetic, genomic metabolic characteristics we propose to name this chemolithoautotrophic reducer Candidatus...
Summary The sulfate‐dependent, anaerobic oxidation of methane (AOM) is an important sink for in marine environments. It carried out between methanotrophic archaea (ANME) and sulfate‐reducing bacteria (SRB) living syntrophic partnership. In this study, we compared the genomes, gene expression patterns ultrastructures three phylogenetically different microbial consortia found hydrocarbon‐rich environments under temperature regimes: ANME‐1a/HotSeep‐1 (60°C), ANME‐1a/Seep‐SRB2 (37°C)...
Summary The first interaction of water column‐derived organic matter with benthic microbial communities takes place in surface sediments which are acting as biological filters catalyzing central steps elemental cycling. Here we analyzed the bacterial diversity and community structure sediment top layers at seven sites North Sea where properties ranged from coarse‐grained highly permeable to fine‐grained impermeable. Bacterial were richer, more even significantly different bottom waters...
Succession of redox processes is sometimes assumed to define a basic microbial community structure for ecosystems with oxygen gradients. In this paradigm, aerobic respiration, denitrification, fermentation and sulfate reduction proceed in thermodynamically determined order, known as the 'redox tower'. Here, we investigated whether sorting explains at low-oxygen concentrations. We subjected diverse sampled from coastal marine sediment 100 days tidal cycling laboratory chemostat. Oxygen...
Crude oil and gases in the seabed provide an important energy source for subsurface microorganisms. We investigated role of archaea anaerobic degradation non-methane alkanes deep-sea seeps from Gulf Mexico. identified microscopically ethane short-chain alkane oxidizers "Candidatus Argoarchaeum" Syntrophoarchaeum" forming consortia with bacteria. Moreover, we found that sediments contain large numbers cells archaeal clade Methanoliparia," which was previously proposed to perform methanogenic...
A haloalkaline anaerobic microbial community obtained from soda lake sediments was used to inoculate reactors for the production of methane rich biogas. The microalga Spirulina successfully digested by consortium at alkaline conditions (pH 10, 2.0 M Na(+)). Continuous biogas observed and in methane, up 96%. Alkaline medium acted as a CO2 scrubber which resulted low amounts no traces H2S produced hydraulic retention time (HRT) 15 days 0.25 g L(-1) day(-1) organic loading rate (OLR) were...
To understand how ocean acidification (OA) influences sediment microbial communities, naturally CO2-rich sites are increasingly being used as OA analogues. However, the characterization of these is often limited to OA-related variables, neglecting additional environmental variables that may confound effects. Here, we an extensive array and bottom water parameters evaluate pH effects on communities at hydrothermal CO2 seeps in Papua New Guinea. The geochemical composition pore showed...
Most autotrophs use the Calvin-Benson-Bassham (CBB) cycle for carbon fixation. In contrast, all currently described from Campylobacterota (previously Epsilonproteobacteria) reductive tricarboxylic acid (rTCA) instead. We discovered campylobacterotal epibionts ("Candidatus Thiobarba") of deep-sea mussels that have acquired a complete CBB and may lost most key genes rTCA cycle. Intriguingly, phylogenies suggest they were in multiple transfers Gammaproteobacteria closely related to...
Sandy coastal sediments are global hotspots for microbial mineralization of organic matter and denitrification. These characterized by advective porewater flow, tidal cycling an active complex community. Metagenomic sequencing communities sampled from such showed that potential sulfur oxidizing Gammaproteobacteria members the enigmatic BD1-5/SN-2 candidate phylum were abundant in situ (>10% ~2% respectively). By mimicking dynamic oxic/anoxic environmental conditions sediment a laboratory...
The South Pacific Gyre, due to its vast size and remoteness, is one of the least-studied oceanic regions on earth. However, both remote sensing in situ measurements indicated that activity microbial community contributes significantly global biogeochemical cycles. Presented here an unparalleled investigation SPG from 20- 5,000-m depths covering a geographic distance ∼7,000 km. This insight was achieved through development novel onboard analysis pipeline, which combines next-generation...
Summary Coastal oceans receive large amounts of anthropogenic fixed nitrogen (N), most which is denitrified in the sediment before reaching open ocean. Sandy sediments, are common coastal regions, seem to play an important role catalysing this N‐loss. Permeable sediments characterized by advective porewater transport, supplies high fluxes organic matter into sediment, but also leads fluctuations oxygen and nitrate concentrations. Little known about how denitrifying communities these adapted...
Summary For the anaerobic remineralization of organic matter in marine sediments, sulfate reduction coupled to fermentation plays a key role. Here, we enriched sulfate‐reducing/fermentative communities from intertidal sediments under defined conditions continuous culture. We transiently exposed cultures oxygen or nitrate twice daily and investigated community response. Chemical measurements, provisional genomes transcriptomic profiles revealed trophic networks microbial populations. Sulfate...
Anaerobic digestion is a biological process in which consortium of microorganisms transforms complex substrate into methane and carbon dioxide. A good understanding the interactions between populations that form this can contribute to successful anaerobic substrate. In study we combine analysis biogas production laboratory digester fed with microalgae Spirulina, protein rich substrate, metagenome responsible for digestion, obtained by high-throughput DNA sequencing. The was also compared...
Abstract Two‐component signal transduction constitutes the predominant strategy used by bacteria to adapt fluctuating environments. The KdpD/KdpE system is one of most widespread, and crucial for K + homeostasis. In Escherichia coli , histidine kinase KdpD senses availability, whereas response regulator KdpE activates synthesis high‐affinity uptake KdpFABC. Here we show that, in absence KdpD, kdpFABC expression can be activated via phosphorylation PhoR. PhoR its cognate PhoB comprise a...