Results 51 to 60 of about 94,355 (261)

Late Holocene camelid pastoralism in the Puna highlands of Argentina: an integrative approach using stable isotope analysis of tooth enamel

Frontiers in Environmental Archaeology
Pre-Hispanic pastoralist mobility has been a major topic in Andean archaeology and it is considered a key component of modern pastoral systems in the Andean highlands.
Celeste T. Samec, Hugo D. Yacobaccio, Patrick Roberts   +2 more
doaj   +1 more source

Carbon and Nitrogen Stable Isotope Values for Plants and Mammals in a Semi-Desert Region of Mongolia [PDF]

Mongolian Journal of Biological Sciences, 2014
Little information exists on the isotopic signatures of plants and animals in Mongolia, limiting the application of stable isotope analysis to wildlife biology studies. Here we present plant and mammal carbon (δ 13 C) and nitrogen (δ 15 N)
Hannah Davie, James D. Murdoch, Andrea Lini, Lkhagvasuren Ankhbayar, Sodnompil Batdorj   +4 more
doaj   +1 more source

Mechanical Programming of PEGDA‐β‐CD Polyrotaxane‐Based Hydrogels via Host–Guest Molecular Recognition

Advanced Functional Materials, EarlyView.
A mechanically programmable hydrogel for tissue engineering is developed by modulating the molecular threading density of poly(ethylene glycol) diacrylate‐β‐cyclodextrin (PEGDA‐β‐CD) polyrotaxane and combining it with β‐CD‐modified gelatin. The polyrotaxane‐guided transition from disordered pores to laminar microstructures enables precise tuning ...
Shiyi Chen, Xudan Xing, Haopu Su, Dominik Voll, Xiaohe Xu, Jiafeng Wan, Tongtong Cui, Christian W. Schmitt, Stefan Bräse, Peng Li, Patrick Théato   +10 more
wiley   +1 more source

Water Organization and Hydration‐Dependent Hydroxide Transport in Anion Exchange Membranes (AEM)

Advanced Functional Materials, EarlyView.
Hydroxide transport in anion exchange membranes is governed by the organization of water within the polymer rather than by hydration alone. A hydration‐window framework is presented to unify transport, swelling, and mechanical stability, providing guidance for designing durable membranes for fuel cells and other hydroxide‐based electrochemical ...
Phumlani F. Msomi
wiley   +1 more source

Mass spectrometric measurement of hydrogen isotope fractionation for the reactions of chloromethane with OH and Cl [PDF]

Atmospheric Chemistry and Physics, 2018
Chloromethane (CH3Cl) is an important provider of chlorine to the stratosphere but detailed knowledge of its budget is missing. Stable isotope analysis is a potentially powerful tool to constrain CH3Cl flux estimates.
F. Keppler, F. Keppler, F. Keppler, E. Bahlmann, E. Bahlmann, M. Greule, M. Greule, H. F. Schöler, J. Wittmer, J. Wittmer, C. Zetzsch, C. Zetzsch   +11 more
doaj   +1 more source

Electrochemical Pathways for Nitrate Conversion to Ammonia: From Environmental Challenges to Ammonia Economy

Advanced Functional Materials, EarlyView.
This perspective presents recent advances in electrocatalytic nitrate reduction, focusing on reaction mechanisms, catalyst design, and electrolyzer configurations. Key challenges in selectivity, stability, and practical wastewater treatment are highlighted, while future directions for advancing sustainable ammonia synthesis and nitrate remediation are ...
Xintong Li, Yunpeng Zuo, Xiaoran Zhang, Jieqiong Shan, Kenneth Mei Yee Leung, Bin Liu, Peter Strasser, Adrian Fisher, Zonglong Zhu, Xin Wang   +9 more
wiley   +1 more source

Research Progress on Stable Isotope Ratio Mass Spectrometry in Baijiu [PDF]

Shipin Kexue
Baijiu has a history of over 2 000 years. It is one of the world’s six major distilled spirits and is the national liquor of China. China has a vast territory, and regional differences in aroma types and brewing methods contribute to the wide diversity ...
XIE Yuxi, ZHAO Yaqi, HONG Yuhan, ZHAO Xuan, LEI Yi
doaj   +1 more source

Anisotropic Phonon Dynamics and Directional Transport in Actinide Van der Waals Semiconductor Uranium Triselenide

Advanced Functional Materials, EarlyView.
USe3 is introduced as an actinide van der Waals semiconductor that mirrors the quasi‐one‐dimensional physics of transition‐metal trichalcogenides. Polarization‐resolved Raman spectroscopy on exfoliated flakes maps strong in‐plane phonon anisotropy and strain‐tunable mode shifts.
Aljoscha Söll, Valentino Jadriško, Sourav Dey, Nassima Benchtaber, Kalyan Sarkar, Borna Radatović, Jan Luxa, Fedor Lipilin, Kseniia Mosina, Vojtěch Kundrát, Jakub Zalesak, Jana Vejpravová, Martin Žáček, Szymon J. Zelewski, Nikolas Antonatos, Christoph Gadermaier, José J. Baldoví, Zdeněk Sofer   +17 more
wiley   +1 more source

Ecological Niche Changes of Two Sympatric Species (Pennahia argentata and Larimichthys polyactis) Revealed by Bulk and Compound Specific Isotope Analyses

Ecology and Evolution
Sympatric species in marine ecosystems often share habitats and food resources, leading to niche competition. We performed ecological niche width estimation based on bulk carbon (δ13C) and nitrogen (δ15N) isotopes and trophic position estimation via ...
Tae‐Sik Yu, Bohyung Choi, Yeonjung Lee, Ihn‐Sil Kwak   +3 more
doaj   +1 more source

Whisker stable isotope values indicate long-term foraging strategies for female New Zealand sea lions

Endangered Species Research, 2019
Determining the foraging strategies for top marine predators is fundamental to understanding their role in the marine ecosystem and essential to gain insight into how species and populations may respond to environmental variability and human impacts. The
Chilvers, BL
doaj   +1 more source