Results 51 to 60 of about 3,012,109 (369)

Confinement Effect and Hydrogen Species Modulation toward Enhanced Electrochemical CO2 Reduction to Ethanol

Research
The protonation process of adsorbed *CO intermediates has been widely recognized as a critical determinant governing product selectivity in electrocatalytic carbon dioxide reduction reaction (eCO2RR). However, the active hydrogen species and mechanism of
Yuting Zhu, Jiamin Zhu, Huizhi Li, Shuhui Li, Yue Zhai, Shao-Wen Xu, Shanshan Wu, Yuan Chen, Yafu Wang, Rui Ren, Li An, Jiangwei Zhang, Pinxian Xi, Chun-Hua Yan   +13 more
doaj   +1 more source

Do oxygen isotope values in collagen reflect the ecology and physiology of neotropical mammals?

Frontiers in Ecology and Evolution, 2015
Stable isotope data provide insight into the foraging ecology of animals. Traditionally, carbon and nitrogen isotope values have been used to infer dietary and habitat preferences.
Brooke eCrowley, Amanda Dawn Melin, Amanda Dawn Melin, Justin Douglas Yeakel, Justin Douglas Yeakel, Nathaniel Jay Dominy   +5 more
doaj   +1 more source

Isotopic Fingerprinting: A Promising Tool for Coffee Authenticity Checks

Proceedings, 2023
Almost every physical or chemical process in nature favors certain light stable isotopes over others, and thereby leaves an isotopic “fingerprint” on the substances involved.
Johannes Wintel, Corina Knipper, Mila Spross, Ronny Friedrich, Steffen Schwarz   +4 more
doaj   +1 more source

Aras Valley (northwest Iran): high-resolution stratigraphy of a continuous central Tethyan Permian–Triassic boundary section [PDF]

Fossil Record, 2020
The Permian–Triassic boundary section in the Aras Valley in NW Iran is investigated with respect to carbonate microfacies, biostratigraphy (particularly conodonts, nautiloids, and ammonoids), chemostratigraphy (carbon isotopes), and environmental setting.
J. Gliwa, A. Ghaderi, L. Leda, M. Schobben, S. Tomás, W. J. Foster, W. J. Foster, M.-B. Forel, N. Ghanizadeh Tabrizi, S. E. Grasby, U. Struck, A. R. Ashouri, D. Korn   +12 more
doaj   +1 more source

Early deglacial Atlantic overturning decline and its role in atmospheric CO 2 rise inferred from carbon isotopes (δ 13 C)

, 2015
. The reason for the initial rise in atmospheric CO2 during the last deglaciation remains unknown. Most recent hypotheses invoke Southern Hemisphere processes such as shifts in midlatitude westerly winds.
A. Schmittner, D. Lund
semanticscholar   +1 more source

Carbon stable isotope turnover and fractionation in grass carp Ctenopharyngodon idella tissues

Aquatic Biology, 2013
Carbon stable isotope signatures can effectively trace food sources, elucidate trophic interactions, and presumably reflect food web structure. The present study conducted a diet-switch experiment using freshwater teleost grass carp Ctenopharyngodon ...
B Xia, QF Gao, SL Dong, F Wang
doaj   +1 more source

Nutrients cause consolidation of soil carbon flux to small proportion of bacterial community

Nature Communications, 2021
The fate of soil carbon depends on microbial processes, but whether different microbial taxa have individualistic effects on carbon fluxes is unknown.
Bram W. Stone, Junhui Li, Benjamin J. Koch, Steven J. Blazewicz, Paul Dijkstra, Michaela Hayer, Kirsten S. Hofmockel, Xiao-Jun Allen Liu, Rebecca L. Mau, Ember M. Morrissey, Jennifer Pett-Ridge, Egbert Schwartz, Bruce A. Hungate   +12 more
doaj   +1 more source

Biochemical and physiological bases for the use of carbon and nitrogen isotopes in environmental and ecological studies

Progress in Earth and Planetary Science, 2015
We review the biochemical and physiological bases of the use of carbon and nitrogen isotopic compositions as an approach for environmental and ecological studies. Biochemical processes commonly observed in the biosphere, including the decarboxylation and
N. Ohkouchi, N. Ogawa, Y. Chikaraishi, Hiroyuki Tanaka, E. Wada   +4 more
semanticscholar   +1 more source

Carbon and alkalinity outwelling across the groundwater‐creek‐shelf continuum off Amazonian mangroves

Limnology and Oceanography Letters, 2021
Lateral fluxes (i.e., outwelling) of dissolved organic (DOC) and inorganic (DIC) carbon and total alkalinity were estimated using radium isotopes at the groundwater, mangrove creek, and continental shelf scales in the Amazon region.
Alex Cabral, Thorsten Dittmar, Mitchell Call, Jan Scholten, Carlos E. deRezende, Nils Asp, Martha Gledhill, Michael Seidel, Isaac R. Santos   +8 more
doaj   +1 more source

Isotopes in hydrology and hydrogeology [PDF]

, 2019
The structure, status, and processes of the groundwater system, which can only be acquired through scientific research efforts, are critical aspects of water resource management. Isotope hydrology and hydrogeology is a genuinely interdisciplinary science.
Barbieri, Maurizio
core   +1 more source