A5063110728- Methane Hydrates and Related Phenomena
- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Wastewater Treatment and Nitrogen Removal
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Hydrocarbon exploration and reservoir analysis
- Isotope Analysis in Ecology
- Marine Biology and Ecology Research
- Metabolomics and Mass Spectrometry Studies
- Marine and environmental studies
- Microbial metabolism and enzyme function
- Groundwater and Isotope Geochemistry
- Enhanced Oil Recovery Techniques
- Geological and Geophysical Studies
- Advanced Chemical Sensor Technologies
- Genomics and Phylogenetic Studies
- Fatty Acid Research and Health
- Soil and Water Nutrient Dynamics
- Ocean Acidification Effects and Responses
- Tuberculosis Research and Epidemiology
- Mycobacterium research and diagnosis
- Calcium Carbonate Crystallization and Inhibition
- Coal Properties and Utilization
- CO2 Sequestration and Geologic Interactions
Royal Netherlands Institute for Sea Research
2012-2025
Newcastle University
2014-2023
Utrecht University
2017-2022
University of Newcastle Australia
2020
Summary In marine oxygen minimum zones ( OMZ s), ammonia‐oxidizing archaea AOA ) rather than bacteria AOB may provide nitrite to anaerobic ammonium‐oxidizing (anammox) bacteria. Here we demonstrate the cooperation between anammox and nitrifiers in a laboratory‐scale model system under limitation. A bioreactor containing ‘ C andidatus S calindua profunda’ was supplemented with N itrosopumilus maritimus strain SCM 1) cells limited amounts of oxygen. this way stable mixed culture , established...
Methanotrophs, in particular methane-oxidizing bacteria (MOB), regulate the release of methane from lakes, and often co-occur with methylotrophs that may enhance methane-oxidation rates. Assessing interaction physiological status these two microbial groups is essential for determining buffering capacity environmental systems. Microbial membrane lipids are commonly used as taxonomic markers specific groups; however, few studies have characterized changes under different conditions. For case...
Anaerobic ammonium-oxidizing (anammox) bacteria have been recognized as an important sink for fixed nitrogen and are detected in many natural environments. However, their presence terrestrial ecosystems has long overlooked, contribution to the cycling agricultural soils is currently unknown. Here we describe enrichment characterization of anammox from a nitrogen-loaded peat soil. After 8 months incubation with surface water sampling site increasing ammonium nitrite concentrations, cells...
Aerobic methane oxidation (AMO) is one of the primary biologic pathways regulating amount (CH4) released into environment. AMO acts as a sink CH4, converting it carbon dioxide before reaches atmosphere. It interest for (paleo)climate and cycling studies to identify lipid biomarkers that can be used trace events, especially at times when role in cycle was more pronounced than today. bacteria are known synthesise bacteriohopanepolyol (BHP) lipids. Preliminary evidence pointed towards...
Advances in sampling tools, analytical methods and data handling capabilities have been fundamental to the growth of marine organic biogeochemistry over past four decades. There has always a strong feedback between advances scientific advances. However, whereas technology were often driving force that made possible progress elucidating sources fate matter ocean first decades biogeochemistry, today process-based questions should drive developments. are several paradigm shifts challenges for...
Abstract In response to rising CO 2 concentrations and increasing global sea surface temperatures, oxygen minimum zones (OMZ), or “dead zones”, are expected expand. OMZs fueled by high primary productivity, resulting in enhanced biological demand at depth, subsequent depletion, attenuation of remineralization. This results the deposition organic carbon‐rich sediments. Carbon drawdown is estimated biogeochemical models; however, a major process ignored: carbon fixation mid‐ lower water...
Anaerobic ammonium oxidation (anammox) is a major process of bioavailable nitrogen removal from marine systems. Previously, bacteriohopanetetrol (BHT) isomer, with unknown stereochemistry, eluting later than BHT when examined by high performance liquid chromatography (HPLC), was detected in ‘Ca. Scalindua profunda’ and proposed as biomarker for anammox paleo-environments. However, the utility this isomer an hindered fact that four other, non-anammox, bacteria are also known to produce...
Bacteriohopanepolyols (BHPs) are lipids with great chemotaxonomic potential for microbial populations and biogeochemical processes in the environment. The most commonly used methods BHP analysis chemical degradation followed by gas chromatography-mass spectrometry (MS) or derivatization high performance liquid chromatography (HPLC)-atmospheric pressure ionization/MS. Here we report on significant advances of non-derivatized BHPs using U(ltra)HPLC-electrospray ionization-high resolution MS2....
Abstract. The eastern Mediterranean Sea sedimentary record is characterised by intervals of organic-rich sapropel sediments, indicating periods severe anoxia triggered astronomical forcing. It has been hypothesised that nitrogen fixation was crucial in injecting the with bioavailable (N) during events. However, evolution N biogeochemical cycle sapropels poorly understood. For example, role complementary removal reactions like anaerobic ammonium oxidation (anammox) not investigated because...
Bacteriohopanepolyols (BHPs) are structurally diverse compounds produced by a wide range of bacteria making them ideal candidates as chemotaxonomic biomarkers and indicators bacterially driven biogeochemical processes in the geological record. In this study, we characterize changes BHP distribution Black Sea over past 20 ka basin underwent three distinct environmental phases: (i) an oxic lacustrine phase where was disconnected from global ocean; (ii) transition period marked initial influx...
Abstract. The northern Benguela upwelling system (NBUS) off Namibia is one of the most productive marine regions globally, with intense biogeochemical cycling and burial essential elements such as carbon, nitrogen phosphorus. Element strongly impacted by temporally spatially variable degrees oxygen depletion, both in water column sediment; a perennial minimum zone (OMZ; O2 ~ 50 µmol L-1) impinges on slope while shelf seasonally oxygen-depleted even euxinic (i.e. free sulphide column). Areas...
Abstract. Bacteriohopanepolyols (BHPs) are structurally diverse compounds produced by a wide range of bacteria making them ideal candidates as chemotaxonomic biomarkers and indicators bacterially-driven biogeochemical processes in the geological record. In this study, we characterize changes BHP distribution Black Sea over past 20 thousand years (ka), basin underwent three distinct environmental phases: (i) an oxic lacustrine phase where was disconnected from global ocean; (ii) transition...