A5073708320- Wastewater Treatment and Nitrogen Removal
- Microbial Community Ecology and Physiology
- Microbial Fuel Cells and Bioremediation
- biodegradable polymer synthesis and properties
- Microplastics and Plastic Pollution
- Genomics and Phylogenetic Studies
- Invertebrate Taxonomy and Ecology
- Pharmaceutical and Antibiotic Environmental Impacts
- Recycling and Waste Management Techniques
- Aquatic Invertebrate Ecology and Behavior
- Collembola Taxonomy and Ecology Studies
- Insect Utilization and Effects
- Methane Hydrates and Related Phenomena
- Bee Products Chemical Analysis
- Forensic Anthropology and Bioarchaeology Studies
- Pleistocene-Era Hominins and Archaeology
- Anaerobic Digestion and Biogas Production
- Food Industry and Aquatic Biology
- Soil Carbon and Nitrogen Dynamics
- Peatlands and Wetlands Ecology
Leibniz University Hannover
2019-2024
University of Aberdeen
2016-2021
Université Claude Bernard Lyon 1
2019-2021
Laboratoire Ampère
2018-2021
École Centrale de Lyon
2019-2021
University of Bayreuth
2016
Abstract High and low rates of ammonium supply are believed to favour ammonia-oxidising bacteria (AOB) archaea (AOA), respectively. Although their contrasting affinities for suggested account these differences, the influence ammonia concentration on AOA AOB has not been tested under environmental conditions. In addition, while both contribute nitrous oxide (N2O) emissions from soil, N2O yields (N2O–N produced per NO2−–N generated oxidation) lower, suggesting lower when dominate oxidation....
Nitrogen fertilisation of agricultural soil contributes significantly to emissions the potent greenhouse gas nitrous oxide (N2 O), which is generated during denitrification and, in oxic soils, mainly by ammonia oxidisers. Although laboratory cultures oxidising bacteria (AOB) and archaea (AOA) produce N2 O, their relative activities are unknown. This work tested hypothesis that AOB dominate oxidation O production under conditions high inorganic (NH3 ) input, but result from activity AOA when...
Studies of the distribution ammonia oxidising archaea (AOA) and bacteria (AOB) suggest distinct ecological niches characterised by concentration pH, arising through differences in substrate affinity tolerance. AOA form five phylogenetic clades, one which, ‘Nitrososphaera sister cluster’, has no cultivated isolate. A representative this cluster, named ‘Candidatus Nitrosocosmicus franklandus’, was isolated from a pH 7.5 arable soil we propose new cluster name: ‘Nitrosocosmicus’. While analysis...
Abstract Nitrification, the oxidation of ammonia to nitrate, is an essential process in biogeochemical nitrogen cycle. The first step nitrification, oxidation, performed by three, often co-occurring guilds chemolithoautotrophs: ammonia-oxidizing bacteria (AOB), archaea (AOA), and complete oxidizers (comammox). Substrate kinetics are considered be a major niche-differentiating factor between these guilds, but few AOA strains have been kinetically characterized. Here, kinetic properties 12...
Abiotic processes involving the reactive ammonia-oxidation intermediates nitric oxide (NO) or hydroxylamine (NH2OH) for N2O production have been indicated recently. The latter process would require availability of substantial amounts free NH2OH chemical reactions during ammonia (NH3) oxidation, but little is known about extracellular formation by different clades ammonia-oxidizing microbes. Here we determined concentrations in culture media several bacteria (AOB) and archaea (AOA), as well...
Summary Ammonia oxidising bacteria (AOB) are thought to emit more nitrous oxide (N 2 O) than ammonia archaea (AOA), due their higher N O yield under oxic conditions and denitrification in response oxygen (O ) limitation. We determined the kinetics of growth turnover nitric (NO) at low cell densities Nitrosomonas europaea Nitrosopumilus maritimus (AOA) during gradual depletion TAN (NH 3 + . Half‐saturation constants for were similar those by others, except half‐saturation constant ammonium N....
The first step of autotrophic nitrification is performed by ammonia-oxidizing archaea (AOA) and bacteria (AOB). Recent studies show that their relative contributions are determined the substrate sources availability, yet evidence provided quantification respective gross activities in soil lacking. Here, we conducted a microcosm study with agricultural high (50 μg N g−1) low (5 ammonium application, quantified rates using 15N-tracers. AOA AOB were distinguished bacterial inhibitor 1-octyne...
Microplastic contamination in soil has become a global environmental threat as it adversely affects terrestrial organisms like earthworms well properties. Especially biodegradable polymers have recently been used an alternative to conventional polymer types, although their impact remains poorly understood. Thus, we studied the effect of (polystyrene: PS, polyethylene terephthalate: PET, polypropylene: PP) versus aliphatic polyesters classified (poly-(l-lactide): PLLA, polycaprolactone: PCL)...
Abstract Environmental microplastic (MP) is ubiquitous in aquatic and terrestrial ecosystems providing artificial habitats for microbes. Mechanisms of MP colonization, polymer impacts, effects on soil microbiomes are largely unknown systems. Therefore, we experimentally tested the hypothesis that type an important deterministic factor affecting community assembly by incubating common types situ landfill 14 months. 16S rRNA gene amplicon sequencing indicated polymers have specific impacts...
Microplastic (MP) is an environmental burden and enters food webs via ingestion by macrofauna, including isopods (Porcellio scaber) in terrestrial ecosystems. Isopods represent ubiquitously abundant, ecologically important detritivores. However, MP-polymer specific effects on the host its gut microbiota are unknown. We tested hypothesis that biodegradable (polylactic acid [PLA]) non-biodegradable (polyethylene terephthalate [PET]; polystyrene [PS]) MPs have contrasting P. scaber mediated...
Abstract Nitrification, the oxidation of ammonia to nitrate, is an essential process in biogeochemical nitrogen cycle. The first step nitrification, oxidation, performed by three, often co- occurring guilds chemolithoautotrophs: ammonia-oxidizing bacteria (AOB), archaea (AOA), and complete oxidizers (comammox). Substrate kinetics are considered be a major niche-differentiating factor between these guilds, but few AOA strains have been kinetically characterized. Here, kinetic properties 12...
Microplastic accumulates in various habitats, posing a potential environmental threat. Biodegradable polymers like poly(L-lactide) (PLLA) is possible eco-friendly alternative to conventional, non-biodegradable plastics. However, biodegradation of PLLA soil strongly limited, but potentially enhanced by soil-dwelling organisms. We recently showed that exposure positively affected reproduction the earthworm Eisenia fetida, and increased gut lactate concentrations, indicating hypothesis...
"Candidatus Nitrosocosmicus franklandus" C13 is an ammonia-oxidizing archaeon (AOA) isolated from soil. Its complete genome 2.84 Mb and possesses predicted AOA metabolic pathways for energy generation carbon dioxide fixation but no typical surface layer (S-layer) proteins, only one ammonium transporter, divergent A-type ATP synthase genes.
Microplastic accumulates in various habitats, posing a potential environmental threat. Biodegradable polymers like poly(L-lactide) (PLLA) is possible eco-friendly alternative to conventional, non-biodegradable plastics. However, biodegradation of PLLA soil strongly limited, but potentially enhanced by soil-dwelling organisms. We recently showed that exposure positively affected reproduction the earthworm Eisenia fetida, and increased gut lactate concentrations, indicating hypothesis...
Nitrobacter strain NHB1 is a nitrite-oxidising bacterium previously co-enriched with the neutrophilic ammonia-oxidising Nitrosospira AHB1, consortium that nitrifies in acidic conditions co-culture. Here we characterise growth of isolate as function pH and nitrite (NO 2 - ) concentration, its influence on activity acidophilic soil archaea (AOA). acidotolerant grows optimally at 6.0 (range 5.0 7.5) initial NO concentrations 500 μM. However, optimum decreases to lower typically found soil,...
Microplastic contamination in soil has become an environmental issue of global concern and adversely affects terrestrial organisms like earthworms as well properties. Especially biodegradable polymers have recently been used alternative to conventional polymer types although their impact remains poorly understood. Thus, we studied the effect (polystyrene: PS, polyethylene terephthalate: PET, polypropylene: PP) versus aliphatic polyesters which are classified (poly-(L-lactide): PLLA,...
Abstract Microplastic (MP) pollution is an environmental burden. MP enters food webs via ingestion by macrofauna, including isopods ( Porcellio scaber ) in terrestrial ecosystems. However, MP-effects on the host and its gut microbiome are largely unknown. We tested hypothesis that biodegradable (polylactic acid, PLA) non-biodegradable (polyethylene terephthalate, PET; polystyrene, PS) have contrasting effects P. mediated changes of associated microbiome. Although avoided containing PS,...