Results 41 to 50 of about 57,188 (237)

Research Advance of Chlorine Isotope Analytical Techniques

Journal of Isotopes
Chlorine is widely distributed in nature as a major and minor constituent in natural water bodies and salt deposits. The isotopic composition of chlorine serves as a key tracer for understanding the cycling processes of chlorine，and has been extensively ...
Xiangzhe ZENG, Xijie YIN, Shanshan LIN, Yuhong LI   +3 more
doaj   +1 more source

Beryl Reference Materials for In Situ Oxygen Isotope Determination

Crystals, 2021
The mineral beryl (Be3Al2(SiO3)6) has the most abundant phase with industrial value for extracting a critical metal—beryllium. Due to multi-stage, fluid-induced growth, individual beryl grains may yield complex geochemical records, revealing variations ...
Xiaoxiao Ling, Qiuli Li, Lianjun Feng, Di Zhang, Yu Liu, Guoqiang Tang, Jiao Li, Shitou Wu, Liangliang Huang, Tiejun Li, Yan Liu, Ronald Werner, Xianhua Li   +12 more
doaj   +1 more source

Comparison of gas chromatography/isotope ratio mass spectrometry and liquid chromatography/isotope ratio mass spectrometry for carbon stable‐isotope analysis of carbohydrates

Rapid Communications in Mass Spectrometry, 2015
Rationale We compared gas chromatography/isotope ratio mass spectrometry (GC/IRMS) and liquid chromatography/isotope ratio mass spectrometry (LC/IRMS) for the measurement of δ 13 C values in carbohydrates.
Moerdijk-Poortvliet, Tanja C. W., Schierbeek, Henk, Houtekamer, Marco, van Engeland, Tom, Derrien, Delphine, Stal, Lucas J., Boschker, Henricus T. S.   +6 more
openaire   +5 more sources

CSF Monoamine Metabolites and Cognitive Trajectory in Early Parkinson's Disease

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Background Imaging and postmortem studies indicate that abnormalities in monoaminergic neurotransmission contribute to cognitive impairment in Parkinson's disease (PD). However, it remains uncertain if cerebrospinal fluid (CSF) monoamine metabolites can serve as biomarkers of cognitive decline in early PD.
Jing‐Yu Shao, Rong Li, Yu‐Xiang Jiao, Kai Ma, Hong‐Qi Yang, Zheng‐Yu Sun, Jie‐Wen Zhang, Shuai Chen   +7 more
wiley   +1 more source

Designing Polymer Nanocomposites for X‐Ray Shielding: Mechanisms, Architectures, and Scalable Processing

Advanced Engineering Materials, EarlyView.
This review highlights advances in lightweight, lead‐free polymer nanocomposites for diagnostic X‐ray shielding. By linking filler chemistry, dispersion, architecture, and photon interaction mechanisms, it establishes structure–performance relationships guiding material design.
Aklilu G. Messele, Hossein Ipakchi, Tizazu H. Mekonnen   +2 more
wiley   +1 more source

The application of carbon isotope ratio mass spectrometry to doping control [PDF]

Journal of Mass Spectrometry, 2008
AbstractThe administration of synthetic steroid copies is one of the most important issues facing sports. Doping control laboratories accredited by the World Anti‐Doping Agency (WADA) require methods of analysis that allow endogenous steroids to be distinguished from their synthetic analogs in urine.
Adam T, Cawley, Ulrich, Flenker
openaire   +2 more sources

Electrode and Microstructure Dependence of Oxygen Diffusion in Ferroelectric Hafnium Zirconium Oxide Thin Films

Advanced Functional Materials, EarlyView.
Significant nanoscale oxygen diffusion coefficient variations are measured in ferroelectric hafnium zirconium oxide films with grain boundaries and electrode interfaces exhibiting values 104 times larger than the grain cores. Overall coefficients are 10X larger for films prepared with metal nitride electrodes compared to refractory metals. New insights
Liron Shvilberg, Thomas W. Pfeifer, Chuanzhen Zhou, Yong Kyu Choi, Duk‐Hyun Choe, Patrick E. Hopkins, Jon F. Ihlefeld   +6 more
wiley   +1 more source

Long‐Range Coordination Environment Modulates Single‐Atom Local States and Systemic Impact on CO2 Photoconversion

Advanced Functional Materials, EarlyView.
Terminal groups on Cu porphyrins modulate the electronic states of single‐atom Cu centers through a long‐range electronic effect, without altering the Cu coordination geometry. Meanwhile, a multi‐descriptor framework is established that incorporates porphyrin regulation, hybrid catalyst properties, and CO2 photoreduction capabilities.
Yi Zhang, Jintao Dong, Xiahe Chen, Xiyang Wang, Tiange Wei, Yue Zhu, Tai‐Sing Wu, Yun‐Fang Yang, Shao‐Yuan Leu, Keke Wang, Yuanbin She, Huaming Li, Jiexiang Xia, Molly Meng‐Jung Li   +13 more
wiley   +1 more source

The Use of Stable Isotope Ratio Analysis to Trace European Sea Bass (D. labrax) Originating from Different Farming Systems

Animals, 2020
This study aimed to determine whether isotopic ratio mass spectrometry (IRMS) can discriminate farmed European sea bass according to different farming systems and geographic origins.
Francesca Tulli, José M. Moreno-Rojas, Concetta Maria Messina, Angela Trocino, Gerolamo Xiccato, José M. Muñoz-Redondo, Andrea Santulli, Emilio Tibaldi   +7 more
doaj   +1 more source

Sampling systems for isotope‐ratio mass spectrometry of atmospheric ammonia

Rapid Communications in Mass Spectrometry, 2005
Abstract Passive and active ammonia (NH 3 ) sampling devices have been tested for their nitrogen (N) capture potential and δ 15 N fractionation effects. Several sampling techniques produced significantly different
Skinner, Richard, Ineson, Phil., Jones, Helen, Sleep, Darren, Theobald, Mark   +4 more
openaire   +4 more sources