Steffen Kümmel
YOU?
Author Swipe
View article: Spatial and Temporal Patterns of <i>Gammarus</i> sp. in Lowland Streams Analyzed Through Amino Acid Isotope Analysis
Spatial and Temporal Patterns of <i>Gammarus</i> sp. in Lowland Streams Analyzed Through Amino Acid Isotope Analysis Open
Understanding the trophic ecology and nutrient dynamics of freshwater invertebrates is crucial for evaluating the function and resilience of ecosystems. Although bulk stable isotope analysis is widely used to investigate food web structure…
View article: Stable chlorine isotope composition of chlorofluorocarbons and chloromethane in the troposphere
Stable chlorine isotope composition of chlorofluorocarbons and chloromethane in the troposphere Open
Chloromethane (CH3Cl) and chlorofluorocarbons (CFCs) play an important role in stratospheric ozone loss. Whereas anthropogenic CFC production was banned, CH3Cl emissions originating primarily from natural sources cannot be regulated. Stabl…
View article: A comprehensive view on the fate of 15N isotope-labeled nitrite in model systems for cured and heated sausages
A comprehensive view on the fate of 15N isotope-labeled nitrite in model systems for cured and heated sausages Open
Cured and heated sausage model systems with 15N isotope-labeled nitrite were analyzed with headspace GC-MS, GC-IRMS and EA-IRMS. Nitrous oxide (N2O) was quantified for the first time under food-relevant conditions in the gas phase. After h…
View article: Multi-element isotope fractionation analysis to investigate the photosensitized reactions of humic substance with 3-chloroaniline
Multi-element isotope fractionation analysis to investigate the photosensitized reactions of humic substance with 3-chloroaniline Open
Dissolved organic matter including humic-like substances (HS), acting as photosensitizers participating in electron transfer reactions, can generate a variety of reactive species, such as OH radicals and excited triplet state HS (3HS*) and…
View article: Stable Isotope Reference Materials and Scale Definitions—Outcomes of the 2024 IAEA Experts Meeting
Stable Isotope Reference Materials and Scale Definitions—Outcomes of the 2024 IAEA Experts Meeting Open
The participants of the 12 th International Atomic Energy Agency (IAEA) meeting on stable isotope reference materials reached a consensus, acknowledging the existence and use of two carbon isotope delta scales: the VPDB (Vienna Peedee bele…
View article: Climate change vs. Cd: Which one has a stronger impact on nitrogen cycling in soils under phytoremediation?
Climate change vs. Cd: Which one has a stronger impact on nitrogen cycling in soils under phytoremediation? Open
Soil cadmium (Cd) contamination is a widespread problem in Europe, disrupting plant growth, impairing microbial activity, and threatening human health. Phytoextraction using metal hyperaccumulating plants, like Arabidopsis halleri, offers …
View article: KONATES: A Model Experiment on the Use of Contaminated Aquifers for Heat Management with ATES Plants - Microbiological and Isotopic Investigations
KONATES: A Model Experiment on the Use of Contaminated Aquifers for Heat Management with ATES Plants - Microbiological and Isotopic Investigations Open
ATES (Aquifer Thermal Energy Storage) is a CO2-free technology for seasonal heating or cooling of buildings based on the storage and recovery of thermal energy in the aquifer. Since aquifers in urban areas are often contaminated with organ…
View article: How varying natural metal concentrations shape climate change impacts on nutrient cycling in bulk and rhizosphere agricultural soils
How varying natural metal concentrations shape climate change impacts on nutrient cycling in bulk and rhizosphere agricultural soils Open
Climate change, marked by rising atmospheric CO₂ levels and temperature, can strongly influence soil processes such as nutrient cycling and microbial dynamics. Metals can negatively impact soil functionality, and modify microbial com…
View article: Multi-element compound-specific stable isotope analysis (2H, 13C, 15N, 33/34S) to characterize the mechanism of sulfate and hydroxyl radical reaction and photolysis of benzothiazole
Multi-element compound-specific stable isotope analysis (2H, 13C, 15N, 33/34S) to characterize the mechanism of sulfate and hydroxyl radical reaction and photolysis of benzothiazole Open
Benzothiazole was taken as a simple emerging aromatic heterocyclic contaminant as model compounds for analyzing multi-element isotope (ME-CSIA) fractionation (2H, 13C, 15N and 33/34S) for the first time, in order to obtain information on t…
View article: Development of a δ<sup>13</sup>C and δ<sup>34</sup>S Isotope Analysis Method for Sulfadimidine and Its Potential to Trace Contaminant Transformation in Groundwater Systems
Development of a δ<sup>13</sup>C and δ<sup>34</sup>S Isotope Analysis Method for Sulfadimidine and Its Potential to Trace Contaminant Transformation in Groundwater Systems Open
The widespread occurrence of micropollutants like the antibiotic sulfadimidine in the environment has become a growing concern. Compound-specific stable isotope analysis (CSIA) offers a powerful tool for tracking the fate of such pollutant…
View article: Heterotrophic nitrate reduction potential of an aquifer microbial community from psychrophilic to thermophilic conditions
Heterotrophic nitrate reduction potential of an aquifer microbial community from psychrophilic to thermophilic conditions Open
High temperature-aquifer thermal energy storage (HT-ATES) aims at the seasonal storage and extraction of large quantities of heat in the subsurface. However, the impacts of temperature fluctuations caused by HT-ATES toward biodiversity and…
View article: Author Correction: Back flux during anaerobic oxidation of butane support archaea-mediated alkanogenesis
Author Correction: Back flux during anaerobic oxidation of butane support archaea-mediated alkanogenesis Open
Correction to: Nature Communicationshttps://doi.org/10.1038/s41467-024-53932-9, published online 07 November 2024 In this article the affiliation details for Songcan Chen were incorrectly given as “MOE Key Laboratory of Environmental Remed…
View article: Carbon, hydrogen, nitrogen and chlorine isotope fractionation during 3-chloroaniline transformation in aqueous environments by direct photolysis, TiO2 photocatalysis and hydrolysis
Carbon, hydrogen, nitrogen and chlorine isotope fractionation during 3-chloroaniline transformation in aqueous environments by direct photolysis, TiO2 photocatalysis and hydrolysis Open
This study investigates carbon, hydrogen, nitrogen and chlorine isotope fractionation during the transformation of 3-chloroaniline (3-CA) via direct photolysis, TiO2 photocatalytic degradation at neutral condition and hydrolysis at pH 3, p…
View article: Back flux during anaerobic oxidation of butane supports archaea-mediated alkanogenesis
Back flux during anaerobic oxidation of butane supports archaea-mediated alkanogenesis Open
Microbial formation and oxidation of volatile alkanes in anoxic environments significantly impacts biogeochemical cycles on Earth. The discovery of archaea oxidizing volatile alkanes via deeply branching methyl-coenzyme M reductase variant…
View article: Dual C and Cl compound-specific isotope analysis and metagenomic insights into the degradation of the pesticide methoxychlor
Dual C and Cl compound-specific isotope analysis and metagenomic insights into the degradation of the pesticide methoxychlor Open
This study investigates the use of multi-element compound-specific isotope analysis (ME-CSIA) to monitor degradation processes of methoxychlor, a persistent organochlorine insecticide. Laboratory experiments examined the kinetics, release …
View article: Vitamin B<sub>12</sub> as a source of variability in isotope effects for chloroform biotransformation by <i>Dehalobacter</i>
Vitamin B<sub>12</sub> as a source of variability in isotope effects for chloroform biotransformation by <i>Dehalobacter</i> Open
Carbon and chlorine isotope effects for biotransformation of chloroform by different microbes show significant variability. Reductive dehalogenases (RDase) enzymes contain different cobamides, affecting substrate preferences, growth yields…
View article: Characterization of anaerobic biotransformation of hexachlorocyclohexanes by novel microbial consortia enriched from channel and river sediments
Characterization of anaerobic biotransformation of hexachlorocyclohexanes by novel microbial consortia enriched from channel and river sediments Open
The microbial biotransformation of hexachlorocyclohexane (HCH) by novel anaerobic microbial consortia enriched from sediments of an industrial effluent channel and the river Ravi in Pakistan was examined. The anaerobic consortia were capab…
View article: Continuous-Flow Stable Sulfur Isotope Analysis of Organic and Inorganic Compounds by EA-MC-ICPMS
Continuous-Flow Stable Sulfur Isotope Analysis of Organic and Inorganic Compounds by EA-MC-ICPMS Open
Elemental analysis (EA) coupled to isotope ratio mass spectrometry (IRMS) is a well-established method to derive stable isotope ratios of sulfur (34S/32S). Conversion of sulfur to SO2 by EA and measurement of SO2 isotopologues by IRMS repr…
View article: Stable Isotope Probing‐nanoFTIR for Quantitation of Cellular Metabolism and Observation of Growth‐Dependent Spectral Features
Stable Isotope Probing‐nanoFTIR for Quantitation of Cellular Metabolism and Observation of Growth‐Dependent Spectral Features Open
This study utilizes nanoscale Fourier transform infrared spectroscopy (nanoFTIR) to perform stable isotope probing (SIP) on individual bacteria cells cultured in the presence of 13 C‐labelled glucose. SIP‐nanoFTIR simultaneously quantifies…
View article: Tracking the transformation of persistent organic pollutants in food webs using multi element isotope and enantiomer fractionation
Tracking the transformation of persistent organic pollutants in food webs using multi element isotope and enantiomer fractionation Open
In order to track the transformation of persistent organic pollutants (POPs) in food webs, field experiments were conducted at two sites using stable isotope and enantiomer fractionation concepts. The enantiomers of α-hexachlorocyclohexane…
View article: Disentangling effects of multiple agricultural stressors on benthic and hyporheic nitrate uptake
Disentangling effects of multiple agricultural stressors on benthic and hyporheic nitrate uptake Open
Agricultural land use alters nitrate (NO 3 – ) uptake dynamics in streams, but the specific mechanisms linking individual agricultural stressors to benthic and hyporheic uptake remain unclear. Using stream-side mesocosms and 15 N-nitrate a…