Results 61 to 70 of about 486,624 (356)

An Improved Cr-EA-IRMS Method for the Effective Determination of the Hydrogen Isotopes in Coal Samples

Frontiers in Chemistry, 2022
Hydrogen isotope analysis of coal is an important tool in the geochemical analysis of coal. The traditional method of hydrogen isotope analysis of coal requires the oxidation of organic matter bound hydrogen in coal to water by an oxidizing agent and ...
Hongwei Li, Hongwei Li, Lianjun Feng, Lianjun Feng   +3 more
doaj   +1 more source

CSF Levels of NPTX2 Are Associated With Less Brain Atrophy Over Time in Cognitively Unimpaired Individuals

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Introduction Neuronal pentraxin 2 (NPTX2) is a synaptic protein involved in synaptic plasticity and regulation of neuronal excitability. Lower baseline cerebrospinal fluid (CSF) NPTX2 levels have been shown to be associated with an earlier onset of mild cognitive impairment (MCI), a pre‐dementia syndrome, even after CSF Alzheimer's Disease (AD)
Juan P. Vazquez, Corinne Pettigrew, Yuxin Zhu, Claire Anderson, Guray Erus, Christos Davatzikos, Michael Miller, Abhay Moghekar, Sungtaek Oh, Chan‐Hyun Na, Marilyn Albert, Paul Worley, Anja Soldan   +12 more
wiley   +1 more source

Stable isotope analysis (δ13C and δ15N) of soil nematodes from four feeding groups [PDF]

PeerJ, 2016
Soil nematode feeding groups are a long-established trophic categorisation largely based on morphology and are used in ecological indices to monitor and analyse the biological state of soils.
Carol Melody, Bryan Griffiths, Jens Dyckmans, Olaf Schmidt   +3 more
doaj   +2 more sources

Nitrogen isotope analysis of ammonium and glycine [PDF]

, 2005
Stable isotope techniques can be used as a tool in nitrogen cycling studies of different ecosystems. The studies are based on measurement of the heavy (15N)- to- light (14N) isotopic ratios of nitrogen in different biospheric pools.
Norlin, Elin
core  

Carbon stable isotope analysis of cereal remains as a way to reconstruct water availability: preliminary results [PDF]

, 2011
Reconstructing past water availability, both as rainfall and irrigation, is important to answer questions about the way society reacts to climate and its changes and the role of irrigation in the development of social complexity.
AM Rosen, B Finlayson, BD Marino, C Grigson, C Körner, C Körner, C Migowski, DH Price, DW McCreery, E Galili, E Jenkins, E Kaptijn, E Peltenburg, Emma Jenkins, F Braemer, FB Salisbury, G Fiorentino, G Fiorentino, G Jones, G Palumbo, G Philip, G Rollefson, GD Farquhar, GD Farquhar, GD Farquhar, GD Farquhar, GK Gillmore, GR Stewart, Gundula Müldner, H Helbaek, H Weiss, HR Stokes, I Kuijt, J Codron, J Doorenbos, J Hoefs, J Mabry, J Mabry, J Sealy, JL Araus, JL Araus, JL Araus, JL Araus, JL Araus, JN Postgate, JP Ferrio, JP Ferrio, JP Ferrio, JP Ferrio, JP Ferrio, JP Oleson, JR Ehleringer, JW Laundré, K Bastert, K Prag, KT Hubick, KW Butzer, L Cabrera-Bosquet, LT Tieszen, M Aguilera, M Charles, M Davies, M Harrower, M Madella, M Staubwasser, MH O’Leary, MW Ertsen, N Roberts, NK Fageria, P Monneveux, P Wright, Pascal Flohr, PB deMenocal, PG Whitehead, PMMG Akkermans, R Matthews, R Shaheen, RB Austin, RC Hunt, RS Wenke, RTJ Cappers, S Fujii, S Fujii, S Helms, S Mithen, S Riehl, S Riehl, SJ Bourke, SW Helms, TE Dawson, TE Levy, THE Heaton, THE Heaton, TW Boutton, TW Boutton, U Bellwald, VL Scarborough, Y Garfinkel   +97 more
core   +1 more source

Large Area, Cost‐Effective, and Ultra‐Fast Fabrication of Mini‐Coils Toward Noninvasive Magnetic Applications

Advanced Engineering Materials, EarlyView.
A simple, cleanroom‐free method produces flexible mini‐coils using automated blade cutting. The process is fast, low‐cost, and supports diverse materials. The coils show strong durability and performance under repeated bending. Demonstrated use in resistor‐inductor filters and magnetic nanoparticle control proves their adaptability.
Changhao Ge, Bhavani Prasad Yalagala, Tahereh Masalehdan, Mahdieh Shojaei Baghini, Danijela Gregurec, Hadi Heidari   +5 more
wiley   +1 more source

Water sources effects on soil salinity and biomass production of agriculture and agroforest systems in raised fields

Journal of Plant Interactions, 2020
This study investigates the sources of water under four modes, namely, normal fields, Raised Fields, single agriculture in Raised Fields, and agroforest system in Raised Fields, by using a combination of δ18O, δ2H and δ13C and their effects on crop yield
Hengyu Hu, Mengkun Zhang, Min Fu, Jihao Qin, Jiansheng Chen, Yupeng Feng, Geng Li, Mingzhen Zhai, Yin Zhang, Tangyuan Ning   +9 more
doaj   +1 more source

Cadmium Isotope Fractionation and Its Applications in Tracing the Source and Fate of Cadmium in the Soil: A Review

Yankuang ceshi, 2022
BACKGROUND Soil cadmium pollution has become one of the main factors that endanger human health. Rapid and effective remediation of Cd pollution soil requires a fundamental understanding of Cd sources and geochemical cycling.
WAN Dan, CHEN Jiubin, ZHANG Ting, AN Yuchen, SHUAI Wangcai   +4 more
doaj   +1 more source

Determining trophic niche width: a novel approach using stable isotope analysis [PDF]

, 2004
1. Although conceptually robust, it has proven difficult to find practical measures of niche width that are simple to obtain, yet provide an adequate descriptor of the ecological position of the population examined. 2.
Adams, C.E., Bearhop, S., Fuller, R.A., Macleod, H., Waldron, S.   +4 more
core   +1 more source

Calibration of isotope amount ratios by analysis of isotope mixtures

Analytical and Bioanalytical Chemistry, 2012
The question as to what constitutes a fully calibrated isotope amount ratio measurement still remains a topic of active research. For years, the definitive calibration approach has been by means of synthetic mixtures of highly enriched isotopes with known chemical purity to give gravimetrically defined ratios.
openaire   +4 more sources