Results 61 to 70 of about 18,269 (245)

Nitrogen dynamics and nitrate stable isotopes indicate nitrogen loss in the Bay of Bengal [PDF]

Biogeosciences
Oxygen-minimum zones (OMZs) play an important role in the global oceanic nitrogen cycle because they account for 20 % to 40 % of the global loss of bioavailable nitrogen despite covering only about 1 % of the global ocean volume.
G. Schulz, G. Schulz, K. Dähnke, T. Sanders, J. Penopp, H. W. Bange, R. Czeschel, B. Gaye   +7 more
doaj   +1 more source

Near‐Unity Selectivity Inversion Between CO2 Electroreduction and H2 Evolution via Atomic Coordination Editing

Advanced Science, EarlyView.
Atomic coordination editing functions as an on/off switch that toggles single‐atom catalysts between CO2 electroreduction and hydrogen evolution. ABSTRACT Precise atomic coordination editing of single‐atom catalysts (SACs) provides an effective strategy to tune their electronic structures and catalytic selectivity. Yet, achieving near‐unity selectivity
Yukun Zhao, Yuanyuan He, Mengyu Duan, Peng Yin, Jinxing Chen, Xu Han, Jie Yang, Yulin Wang, Xingjie Fu, Shibo Xi, Chuncheng Chen, Jiong Lu   +11 more
wiley   +1 more source

Adaptive Coordination Engineering for Efficient and Robust H2 Release

Advanced Science, EarlyView.
β‐H elimination is a pivotal but challenging step in homogeneous formic acid dehydrogenation reactions due to strict hydride‐metal matching. By using a rationally designed Pd1Ag2 bimetallic system with adaptive Pd1‐Ag2/L2 coordination and formate bridges, it enables boosted formic acid dehydrogenation under ambient air (7.7 times higher than a Pd ...
Xiaolin Jiang, Xiaoyang Yan, Shenglong Jiang, Hongdan Zhu, Heng Wang, Xiaopeng Li, Xiaochun Zhou, Mingdong Zhou, Qian Peng   +8 more
wiley   +1 more source

How Proton Incorporation Reshapes Lattice Dynamics In BaSnO3‐Type Proton Conductors

Advanced Science, EarlyView.
Yttrium‐doped BaSnO3 exhibits isotope‐dependent changes in its low‐energy vibrational density of states upon hydration. Comparison of dry, H2O‐, and D2O‐treated samples re‐veals mass‐dependent phonon renormalization linked to proton dynamics near oxygen va‐cancies, providing experimental insight into hydrogen‐coupled lattice excitations in proton ...
Artur Braun, Alexey Rulev, Nobumoto Nagasawa, Hongxin Wang, Tatyana Bendikov, Vladimir Pomjakushin, Martin Kunz, Yoshitaka Yoda, Qianli Chen, Stephen P. Cramer   +9 more
wiley   +1 more source

Alimentation d’une population historique

Bulletins et Mémoires de la Société d’Anthropologie de Paris, 2003
Tooth wear, caries, and alveolar modifications provide the most common and most informative evidence regarding the nutritional condition of past populations.
Estelle Herrscher
doaj   +1 more source

CHARACTERIZATION OF NITROGEN AND CARBON STABLE ISOTOPES IN EPIPHYTIC FORAMINIFERAL MORPHOTYPES

The Journal of Foraminiferal Research, 2016
Epiphytic foraminifera are important components of the seagrass-meadow biota. These foraminifera previously were categorized, based upon their ecological and feeding strategies, into four morphotypes that were subsequently modified to include a new morphotype for the symbiont-bearing foraminifera.
Mateu, G. (Guillermo), Sebastián, T. (Teresa), Khokhlova, A. (Anna), Leza, M.M. (Maria Mar), Deudero, S. (Salud)   +4 more
openaire   +3 more sources

Water‐Enabled Ultralong Full‐Color Organic Phosphorescence in Hydrogen‐Bonded Frameworks for 4D Encryption and Bio‐Imaging

Advanced Science, EarlyView.
Water‐induced quenching challenges organic RTP materials, but a counter‐intuitive strategy employs HOF to encapsulate carbonyl guests, where water functions as a structural reinforcer. This achieves water‐enhanced ultralong RTP with full‐color emission (blue to deep red), overcoming intracellular quenching for high‐signal cellular imaging, alongside 4D
Pengcheng Wu, Zenggang Lin, Lu Yang, Weisheng Liu   +3 more
wiley   +1 more source

Cultural diversity shaped neolithic subsistence in the Carpathian Basin

Scientific Reports
Stable carbon and nitrogen isotope analysis from archaeological human and animal bone collagen is a powerful tool to enlighten past socio-agricultural systems and their close links to environmental conditions.
M. L. C. Depaermentier, M. Kempf, E. Bánffy, K. W. Alt   +3 more
doaj   +1 more source

Stable Isotope Methods for the Study of the Nitrogen Cycle

, 2013
Nitrogen, a limiting element for biological productivity, plays a key role in regulating the biogeochemical processes in the ocean. In today’s ocean, all of the major reactions in the N cycle are mediated by assimilatory or dissimilatory functions of marine organisms.
openaire   +2 more sources

Stable Nitrogen Isotopes in a Forested Watershed in Taiwan

Journal of Forest and Environmental Science, 2013
Abstract Differences in rates and patterns of nitrogen cycling have been correlated with nitrogen stable isotope measurements in forest ecosystems of tropical and temperate regions, but limited similar work has been conducted in sub-tropical forests. This study investigated patterns in stable N isotopic composition in a subtropical forest in Taiwan by ...
openaire   +2 more sources