A5034929647- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Microbial Community Ecology and Physiology
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies
- Paleontology and Stratigraphy of Fossils
- Marine Bivalve and Aquaculture Studies
- Radioactive element chemistry and processing
- Marine Biology and Ecology Research
- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Algal biology and biofuel production
- Isotope Analysis in Ecology
- Geochemistry and Elemental Analysis
- Geological and Geochemical Analysis
- Radioactive contamination and transfer
- Seismic Imaging and Inversion Techniques
- Aquaculture Nutrition and Growth
- Offshore Engineering and Technologies
- Nuclear Materials and Properties
- Organic Light-Emitting Diodes Research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Radioactivity and Radon Measurements
- Polar Research and Ecology
- Chemical Synthesis and Characterization
University of Rhode Island
2013-2022
University of Gothenburg
2021-2022
Ghent University Hospital
2022
International Ocean Discovery Program
2017
Shikoku (Japan)
2017
Vrije Universiteit Brussel
2014
Microbial life inhabits deeply buried marine sediments, but the extent of this vast ecosystem remains poorly constrained. Here we provide evidence for existence microbial communities in ~40° to 60°C sediment associated with lignite coal beds at ~1.5 2.5 km below seafloor Pacific Ocean off Japan. methanogenesis was indicated by isotopic compositions methane and carbon dioxide, biomarkers, cultivation data, gas compositions. Concentrations indigenous cells 1.5 ranged from <10 ~10(4) cm(-3)....
Deep, hot, and more alive than we thought Marine sediments represent a massive microbial ecosystem, but still do not fully understand what factors shape limit life underneath the seafloor. Analyzing samples from subduction zone off coast of Japan, Heuer et al. found that life, in particular bacterial vegetative cells, decreases as depth temperature increases down to ∼600 meters below seafloor, corresponding temperatures ∼70°C. Below this limit, endospores are common—a remnant, potential...
We examine the 0–100 Ma paleoceanographic record retained in pelagic clay from South Pacific Gyre (SPG) by analyzing 47 major, trace, and rare earth elements bulk sediment 206 samples seven sites drilled during Integrated Ocean Drilling Program Expedition 329. use multivariate statistical analyses (Q-mode factor analysis multiple linear regression) of geochemical data to construct a model composition mass accumulation rates (MAR) six end-members, (post-Archean average Australian shale,...
A fourth of the global seabed sediment volume is buried at depths where temperatures exceed 80 °C, a previously proposed thermal barrier for life in subsurface. Here, we demonstrate, utilizing an extensive suite radiotracer experiments, prevalence active methanogenic and sulfate-reducing populations deeply marine from Nankai Trough subduction zone, heated to extreme temperature (up ~120 °C). The small microbial community subsisted with high potential cell-specific rates energy metabolism,...
ABSTRACT Subseafloor sediment hosts a large, taxonomically rich, and metabolically diverse microbial ecosystem. However, the factors that control diversity in subseafloor have rarely been explored. Here, we show bacterial richness varies with organic degradation rate age. At three open-ocean sites (in Bering Sea equatorial Pacific) one continental margin site (Indian Ocean), decreases exponentially increasing depth. The of decrease depth from to site. vertical succession predominant terminal...
Abstract Dating pelagic clay can be a challenge due to its slow sedimentation rate, post‐depositional alteration, and lack of biogenic deposition. Co‐based dating techniques have the potential create age models in under assumption that flux non‐detrital Co seafloor is spatially temporally constant, resulting concentrations being inversely proportional rate. We apply method sequences from Sites U1365, U1366, U1369, U1370 drilled during Integrated Ocean Drilling Program (IODP) Expedition 329...
Abstract In laboratory and industrial cultivation of marine microalgae, it is customary to enrich cultures with macronutrients (N, P), chelated trace metals, vitamins at ~10 4 × concentrations found in nature obtain high culture densities. Other naturally occurring growth‐promoting compounds local seawater are not enriched remain environmental concentrations. Microalgae may thus be deprived the mutualistic contributions co‐occurring microorganisms which they have evolved complex chemical...
Dissolved inorganic carbon (DIC) concentration and total alkalinity in marine sediment vary with biological activity, mineral diagenesis past bottom ocean water composition. Reliable interpretation of this data is often compromised due to precipitation calcium carbonate (CaCO3) during recovery, processing sample storage. Here we present test a method that corrects for consequently allows quantification situ system chemistry. Our relies on the over-determination dissolved by (i) measuring...
Shellfish, in particular bivalves, are an often-overlooked source of vitamin B12 (B12) the human diet although they have significantly higher tissue levels than other animal meat or fish sources, including all vertebrates. However, origins and key metabolic processes involving bivalves remain largely unknown. In this study, we examined distribution tissues several adult Australian bivalve species assessed hypotheses concerning their utilisation principal uptake, specifically whether it is...
Abstract. During the past decade, IODP (International Ocean Discovery Program) has fostered a significant increase in deep biosphere investigations marine sedimentary and crustal environments, scientists are well-poised to continue this momentum into next phase of IODP. The goals workshop were evaluate recent findings global context, synthesize available biogeochemical data foster thermodynamic metabolic activity modeling measurements, identify regional targets for future targeted sampling...
The study investigates the in-situ strength of sediments across a plate boundary décollement using drilling parameters recorded when 1180-m-deep borehole was established during International Ocean Discovery Program (IODP) Expedition 370, Temperature-Limit Deep Biosphere off Muroto (T-Limit). Information shallow portion in/around fault zone is critical for understanding development accretionary prisms and itself. Studies seismic reflection surveys scientific ocean drillings have recently...
Abstract Iron (Fe) is an essential nutrient for microalgal metabolism. The low solubility of Fe in oxic aquatic environments can be a growth-limiting factor phytoplankton. Synthetic chelating agents, such as ethylenediaminetetraacetic acid (EDTA), are used widely to maintain solution cultivation. non-biodegradable nature EDTA, combined with sub-optimal bioavailability Fe-EDTA complexes microalgae, indicates opportunity improve cultivation practices that amplify production efficiency and...
Abstract The efficiency of microalgal biomass production is a determining factor for the economic competitiveness microalgae-based industries. N-acetylcysteine (NAC) and pluronic block polymers are two compounds interest as novel culture media constituents because their respective protective properties against oxidative stress shear-stress-induced cell damage. Here we quantify effect NAC (F127 F68) additives upon productivity six marine species relevance to aquaculture industry (four...