A5021026152- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Spectroscopy and Quantum Chemical Studies
- Photochemistry and Electron Transfer Studies
- Pain Mechanisms and Treatments
- Atmospheric and Environmental Gas Dynamics
- Mass Spectrometry Techniques and Applications
- Photosynthetic Processes and Mechanisms
- Marine and coastal ecosystems
- Adipose Tissue and Metabolism
- Metabolomics and Mass Spectrometry Studies
- Groundwater and Isotope Geochemistry
- Neuroinflammation and Neurodegeneration Mechanisms
- Paleontology and Stratigraphy of Fossils
- Analytical Chemistry and Chromatography
- Microbial Community Ecology and Physiology
- Photoreceptor and optogenetics research
- Advanced Chemical Physics Studies
- Alzheimer's disease research and treatments
- Advanced Chemical Sensor Technologies
- Botulinum Toxin and Related Neurological Disorders
- Material Dynamics and Properties
- Porphyrin and Phthalocyanine Chemistry
University of Michigan
2016-2025
Michigan United
2013-2022
Northwestern University
2022
Grand Forks Air Force Base
2018-2020
Ann Arbor Center for Independent Living
2018-2020
Heidelberg University
2017-2019
University Hospital Heidelberg
2017-2019
German Cancer Research Center
2017-2019
Heidelberg University
2019
Woods Hole Oceanographic Institution
2000-2018
The serpentinite-hosted Lost City hydrothermal field is a remarkable submarine ecosystem in which geological, chemical, and biological processes are intimately interlinked. Reactions between seawater upper mantle peridotite produce methane- hydrogen-rich fluids, with temperatures ranging from <40 degrees to 90 C at pH 9 11, carbonate chimneys 30 60 meters tall. A low diversity of microorganisms related methane-cycling Archaea thrive the warm porous interiors edifices. Macrofaunal communities...
Research Article| January 01, 2001 Fractionation of Carbon and Hydrogen Isotopes in Biosynthetic Processes* John M. Hayes National Ocean Sciences Accelerator Mass Spectrometry Facility Department Geology Geophysics, Woods Hole Oceanographic Institution Hole, Massachusetts 02543 Search for other works by this author on: GSW Google Scholar Author Article Information Publisher: Mineralogical Society America First Online: 09 Mar 2017 © The Of Reviews Mineralogy Geochemistry (2001) 43 (1):...
Reports of the 13 C content marine particulate organic carbon are compiled and on basis GEOSECS data temperatures, concentrations, isotopic compositions dissolved CO 2 in waters which related phytoplankton grew estimated. In this way, fractionation isotopes during photosynthetic fixation is found to be significantly correlated with concentrations . Because ancient fractionations have been determined from analyses sedimentary porphyrins [Popp et al., 1989], relationship between developed here...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotope-ratio-monitoring gas chromatography-mass spectrometryD. E. Matthews and J. M. HayesCite this: Anal. Chem. 1978, 50, 11, 1465–1473Publication Date (Print):September 1, 1978Publication History Published online1 May 2002Published inissue 1 September 1978https://pubs.acs.org/doi/10.1021/ac50033a022https://doi.org/10.1021/ac50033a022research-articleACS PublicationsRequest reuse permissionsArticle Views1964Altmetric-Citations386LEARN ABOUT THESE...
The carbon isotopic fractionation accompanying formation of biomass by alkenone‐producing algae in natural marine environments varies systematically with the concentration dissolved phosphate. Specifically, if is expressed є P ≈ δ e − p , where and are 13 C values for CO 2 algal (determined analysis 37 alkadienones), respectively, μmol kg −1 then b = 38 + 160*[PO 4 ], [PO ] phosphate, μM, (25 ) . correlation found between due to effects linking nutrient levels growth rates cellular budgets...
Carbon-isotopic compositions of geoporphyrins have been measured from marine sediments Mesozoic and Cenozoic age in order to elucidate the timing extent depletion 13C primary producers. These results indicate that difference isotopic composition coeval carbonates photosynthate was approximately 5 7 permil greater during early than at present. In contrast record producers, terrestrial organic materials remained constant for this same interval time. This records matter is considered terms...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotopic analyses based on the mass spectra of carbon dioxideJeffrey. Santrock, Stephen A. Studley, and J. M. HayesCite this: Anal. Chem. 1985, 57, 7, 1444–1448Publication Date (Print):June 1, 1985Publication History Published online1 May 2002Published inissue 1 June 1985https://pubs.acs.org/doi/10.1021/ac00284a060https://doi.org/10.1021/ac00284a060research-articleACS PublicationsRequest reuse permissionsArticle Views1386Altmetric-Citations245LEARN...
Abstract Autochthonous dengue infections were last reported in Hawaii 1944. In September 2001, the Department of Health was notified an unusual febrile illness a resident with no travel history; fever confirmed. During investigation, 1,644 persons locally acquired denguelike evaluated, and 122 (7%) laboratory-positive identified; virus serotype 1 isolated from 15 patients. No cases hemorrhagic or shock syndrome reported. 3 instances autochthonous linked to person who after French Polynesia....
Concentrations and isotopic compositions of ethane propane in cold, deeply buried sediments from the southeastern Pacific are best explained by microbial production these gases situ. Reduction acetate to provides one feasible mechanism. Propane is enriched (13)C relative ethane. The amount consistent with derivation third C inorganic carbon dissolved sedimentary pore waters. At typical conditions, reactions yield free energy sufficient for growth. Relationships competing processes governed...