Results 121 to 130 of about 4,448 (271)

Using Eye Lens Stable Isotopes to Identify the Rearing Origin of Fall Age‐0 Walleye (Sander vitreus)

Fisheries Management and Ecology, EarlyView.
ABSTRACT Isotope values in fish eye lenses may be useful in differentiating rearing origins. We compared eye lens isotopic values of fall fingerling age‐0 walleye (Sander vitreus) reared in a hatchery pond, a recirculating aquaculture system (RAS), and a natural lake. Using 10 fish per rearing source, we delaminated layers from one eye lens per fish to
Justin M. Sturtz, Benjamin J. Schall, Matthew J. Ward, Cody E. Treft, Steven R. Chipps, Christopher A. Cheek   +5 more
wiley   +1 more source

Variable Sr Diffusion and Implications for Rb–Sr Biotite Geochronology

Journal of Metamorphic Geology, EarlyView.
ABSTRACT The rubidium–strontium (Rb–Sr) system has a long pedigree as a geochronological tool that relies on the application of an isochron approach. In particular, biotite contains strongly radiogenic Rb–Sr isotopes, and thus can yield meaningful crystallisation or cooling ages via this approach. However, the response of the Rb–Sr system in biotite to
Riley Rohrer, Christopher L. Kirkland, Hugo Olierook, Tim Johnson, Katy Evans   +4 more
wiley   +1 more source

Mass-independent sulfur isotope fractionation during photochemistry of sulfur dioxide

, 2015
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2015.Cataloged from PDF version of thesis.Includes bibliographical references (pages 161-175).Mass-independent sulfur isotope signatures are ...
Whitehill, Andrew (Andrew Richard)
core  

Global modelling of H₂ mixing ratios and isotopic compositions with the TM5 model

, 2011
The isotopic composition of molecular hydrogen (H2) contains independent information for constraining the global H2 budget. To explore this, we have implemented hydrogen sources and sinks, including their stable isotopic composition and isotope ...
Langenfelds, R.L., G. Pieterse, T. Röckmann, L. P. Steele, Pieterse, G., Afd Marine and Atmospheric Research, Marine and Atmospheric Research, Steele, L.P., Röckmann, T., Krummel, P.B., Sub Atmospheric physics and chemistry, M. C. Krol, P. B. Krummel, Krol, M.C., R. L. Langenfelds, A. M. Batenburg, Batenburg, A.M.   +16 more
core   +1 more source

Thermal histories of El Médano 300 (EM 300) and Northwest Africa 8155 (NWA 8155): Implications for the diversity of IAB‐ungrouped iron meteorites and their parent bodies

Meteoritics &Planetary Science, EarlyView.
Abstract This study provides the first petrographic, crystallographic, and chemical comparison between El Médano 300 (EM 300) and Northwest Africa 8155 (NWA 8155), two particular IAB‐ungrouped iron meteorites. Both contain exceptionally large graphite nodules and “flowers”, providing unique insights into carbon behavior in metallic melts and cooling ...
L. Perez, M. Roskosz, F. Danoix, L. Kern, V. Megevand, C. Brillatz, B. Devouard, J. Gattacceca, M. Gounelle   +8 more
wiley   +1 more source

Sulfur and Oxygen Isotope Fractionation during Benzene, Toluene, Ethyl Benzene, and Xylene Degradation by Sulfate-Reducing Bacteria

, 2016
We examined the oxygen and sulfur isotope fractionation of sulfate during anaerobic degradation of toluene by sulfate-reducing bacteria in culture experiments with Desulfobacula toluolica as a type strain and with an enrichment culture Zz5-7 obtained ...
Kay Knöller (842790), Carsten Vogt (842789), Stephan M. Weise (2488156), Hans-Herrmann Richnow (2538901)   +3 more
core   +1 more source

Chemical and Isotopic Evidence for Organic Matter Sulfurization in Redox Gradients Around Mangrove Roots

Frontiers in Earth Science, 2019
Coastal environments like mangrove forests are increasingly recognized as potential hotspots for organic carbon burial, giving them a crucial and yet poorly constrained role in the global carbon cycle.
M. R. Raven, D. A. Fike, M. L. Gomes, S. M. Webb   +3 more
doaj   +1 more source

Reassessing the organic carbon budget in the Murchison meteorite through an extraction–recovery mass‐balance approach

Meteoritics &Planetary Science, EarlyView.
Abstract A substantial fraction of organic carbon in carbonaceous chondrites has long been described as “missing,” reflecting incomplete recovery and limited resolution of operationally defined organic components. Here, we present a quantitative reassessment of the carbon budget in the Murchison meteorite using an integrated extraction–recovery mass ...
Hina Dohi, Minako Hashiguchi, Koichi Mimura   +2 more
wiley   +1 more source

Sulfur Isotope Fractionation by Sulfate-Reducing Microbes Can Reflect Past Physiology

, 2018
Sulfur (S) isotope fractionation by sulfate-reducing microorganisms is a direct manifestation of their respiratory metabolism. This fractionation is apparent in the substrate (sulfate) and waste (sulfide) produced.
André Pellerin (4967323), Christine B. Wenk (4967320), Boswell A. Wing (4967317), Itay Halevy (4967326)   +3 more
core   +1 more source

Sulfur isotope fractionation in marine sediments and bacterial cultures.

, 1997
In this study, the sulfur fractionation during bacterial transformation of SO4(2-), SO3(2-), S2O3(2-) and S0 has been quantified to provide a better understanding 0f the stable isotope data available from modern and ancient sediments. For the first time,
Habicht, K. S., Habicht, K.
core   +1 more source