Results 61 to 70 of about 4,516,287 (245)

Stable Isotope Ratios in Hair and Teeth Reflect Biologic Rhythms

PLoS ONE, 2007
Biologic rhythms give insight into normal physiology and disease. They can be used as biomarkers for neuronal degenerations. We present a diverse data set to show that hair and teeth contain an extended record of biologic rhythms, and that analysis of these tissues could yield signals of neurodegenerations.
O. Appenzeller, C. Qualls, F. Barbic, R. Furlan, A. Porta   +4 more
openaire   +4 more sources

Measure of carbon and nitrogen stable isotope ratios in cultured cells [PDF]

Journal of the American Society for Mass Spectrometry, 2004
We report the measurement of the natural isotope ratios of nitrogen and carbon in subcellular volumes of individual cells among a population of cultured cells using a multi-isotope imaging mass spectrometer (MIMS), [MIMS is the prototype of the NanoSIMS 50, Cameca, France.] We also measured the nitrogen and carbon isotope ratio in cells after they had ...
Peteranderl, R, Lechene, C
openaire   +2 more sources

Atom Probe Tomography as an Emerging Tool for Understanding Defect‑Driven Mechanisms in HfO2‑Based Ferroelectrics

Advanced Functional Materials, EarlyView.
This Perspective highlights atom probe tomography as a powerful tool for understanding the atomic‐scale defect chemistry in HfO2‐based ferroelectrics. 3D mapping of dopants, point defects, and interface chemistry can provide new insight into defect‐driven mechanisms underpinning the ferroelectricity in the system and guide the design of more reliable ...
Kasper Hunnestad, Catherine Dubourdieu, Alexei Gruverman, Dennis Meier   +3 more
wiley   +1 more source

Sulfur‐Free Ultrahigh‐Refractive‐Index Polymers Enabled by Densely Packed Oxygen‐Bridged Dibenzofuran‐Cardo Architectures

Advanced Functional Materials, EarlyView.
A new class of sulfur‐free, oxygen‐bridged dibenzofuran‐based polymers is developed for ultrahigh‐refractive‐index applications. The rigid π‐extended architecture and enhanced molecular polarizability enable exceptional optical performance, combining refractive indices up to 1.848 with high Abbe numbers and full visible transparency. This work offers a
Hend A. Hegazy, Gyeongsoo Kim, Sooyoung Lee, Mohamed R. Elmasry, Youn‐Chul Kim, Changsik Song   +5 more
wiley   +1 more source

Characterization and valorisation of the Italian walnut (Juglans regia L.): a first application of stable isotope ratio analysis to determine walnut geographical origin [PDF]

, 2018
The isotope ratio mass spectrometry (IRMS) approach has been successfully used for geographic traceability of agricultural products. Here we preliminarily evaluate the IRMS ability in defining the geographical origin of the Italian walnuts.
Camin, F., Tonon, A., Franceschi, P., Ziller, L., Bianco, L., Di Pierro, E. A., Troggio, M.   +6 more
core   +1 more source

Stable isotope ratios of nitrogen and carbon as biomarkers of a vegan diet

European Journal of Nutrition, 2022
Abstract Purpose Dietary biomarkers can potentially overcome the limitations of self-reported dietary data. While in ecology and archaeology, stable isotope ratios of carbon and nitrogen are widely used as biomarkers, this is not the case in nutrition research. Since the abundance of the 13C and the 15N isotope differ in
Jutta Dierkes, Stefan Dietrich, Klaus Abraham, Bernhard H. Monien, Adrian McCann, Katrine Borgå, Cornelia Weikert   +6 more
openaire   +4 more sources

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

Working standards and analytical framework for CSIA: isotopic composition (δ13C, δ15N, and δ34S) of 21 amino acids and 7 nucleobases

Progress in Earth and Planetary Science
We determined the carbon and nitrogen isotope compositions of biologically important 21 amino acids and 7 nucleobases, which are used as working standards. These isotopic compositions were determined using a high-sensitivity elemental analyzer coupled to
Nanako O. Ogawa, Yoshinori Takano, Yu Itahashi, Naoto F. Ishikawa, Naohiko Ohkouchi   +4 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

Arsenic Species and Nitrogen Stable Isotope Ratios in the Japanese Diet—Dietary Markers of Seafood

Foods
Interest in seafood diet and health warrants a biomarker for seafood consumption. Nitrogen isotope ratio (15N/14N, expressed as δ15N (‰)) has been regarded as a biomarker for such a purpose.
Jun Yoshinaga, Tomohiro Narukawa
doaj   +1 more source