Results 11 to 20 of about 128,824 (253)

Towards a global interpretation of dual nitrate isotopes in surface waters [PDF]

Journal of Hydrology X, 2019
Modern anthropogenic activities have significantly increased nitrate (NO3−) concentrations in surface waters. Stable isotopes (δ15N and δ18O) in NO3− offer a tool to deconvolute some of the human-made changes in the nitrogen cycle.
J.J. Venkiteswaran, P. Boeckx, D.C. Gooddy   +2 more
doaj   +3 more sources

LIBS plasma in atmospheric pressure argon, nitrogen and helium: Spatio-temporal distribution of plume emission and Hα linewidth

Nuclear Materials and Energy, 2023
Laser Induced Breakdown Spectroscopy (LIBS) method is considered for assessing the retention of hydrogen isotopes in the ITER plasma-facing components during the maintenance breaks when the reactor is filled with near atmospheric pressure nitrogen or ...
Indrek Jõgi, Jasper Ristkok, Jelena Butikova, Jüri Raud, Peeter Paris   +4 more
doaj   +1 more source

Sources of nitrate in a heavily nitrogen pollution bay in Beibu Gulf, as identified using stable isotopes

Frontiers in Marine Science, 2022
Eutrophication, mainly caused by the oversupply of inorganic nitrogen and phosphate, has increased and become a serious environmental problem in the coastal bays of Beibu Gulf, a newly developing industry and port in South China.
Shangjun Cai, Shangjun Cai, Qibin Lao, Qibin Lao, Guangzhe Jin, Guangzhe Jin, Chunqing Chen, Chunqing Chen, Xin Zhou, Xin Zhou, Qingmei Zhu, Qingmei Zhu, Xuan Lu, Xuan Lu   +13 more
doaj   +1 more source

Amino Acid δ15N Can Detect Diet Effects on Pollution Risks for Yellow-Legged Gulls Overlooked by Trophic Position

Frontiers in Marine Science, 2021
The use of top-consumers as bioindicators of the health of food webs is hampered by uncertainties in their effective use of resources. In this study, the abundance of stable nitrogen isotopes in amino acids from homogenised eggs of the Yellow-legged Gull
Antonio Bode, Victoria Besada, Begoña Pérez-Fernández, Lucía Viñas   +3 more
doaj   +1 more source

Effects of spawning Pacific salmon on terrestrial invertebrates: Insects near spawning habitat are isotopically enriched with nitrogen‐15 but display no differences in body size

Ecology and Evolution, 2021
When Pacific salmon (Oncorhynchus spp.) spawn and die, they deliver marine‐derived nutrient subsidies to freshwater and riparian ecosystems. These subsidies can alter the behavior, productivity, and abundance of recipient species and their habitats ...
Nicola F. Rammell, Allison M. Dennert, Christopher M. Ernst, John D. Reynolds   +3 more
doaj   +1 more source

Carbon Nitrogen Isotope Coupling of Soils and Seasonal Variation Characteristics in a Small Karst Watershed in Southern China

Land, 2023
Carbon and nitrogen are among the most important biogenic elements in terrestrial ecosystems, and carbon and nitrogen stable isotopes (δ13C and δ15N) are often used to indicate the sources of carbon and nitrogen elements and turnover processes, and the ...
Ya Liu, Ziqi Liu, Kangning Xiong, Yuan Li, Xiaoxi Lyu, Lulu Cai   +5 more
doaj   +1 more source

Extreme enrichment in atmospheric 15N15N. [PDF]

, 2017
Molecular nitrogen (N2) comprises three-quarters of Earth's atmosphere and significant portions of other planetary atmospheres. We report a 19 per mil (‰) excess of 15N15N in air relative to a random distribution of nitrogen isotopes, an enrichment that ...
Fischer, Tobias P, Haslun, Joshua A, Hu, Huanting, Kohl, Issaku E, Li, Shuning, Ostrom, Nathaniel E, Schauble, Edwin A, Yeung, Laurence Y, Young, Edward D   +8 more
core   +1 more source

Study on the Optimal Reaction Temperature and Sampling Weight for Measurement of Carbon and Nitrogen Isotope Ratio by Elemental Analyzer-Isotope Ratio Mass Spectrometer

Yankuang ceshi, 2018
Carbon and nitrogen isotopes are essential tools to study paleoclimate, palaeoenvironment, and ecosystem. At present, carbon and nitrogen isotopes are commonly determined by Elemental Analyzer-Isotope Ratio Mass Spectrometer (EA-IRMS).
XU Li, XING Lan-tian, WANG Xin, LI Zhong-ping, MAO Jun-li   +4 more
doaj   +1 more source

Interpretation of Nitrogen Isotope Profiles in Petroleum Systems: A Review

Frontiers in Earth Science, 2021
Bulk sedimentary nitrogen isotope profiles are often used as proxies for depositional redox conditions, nitrogen cycling, and nutrient uptake in modern and ancient marine systems. The general preference in terms of analysis is that the sediments measured
Tracy M. Quan, Oyeleye O. Adeboye
doaj   +1 more source

Do oxygen isotope values in collagen reflect the ecology and physiology of neotropical mammals?

Frontiers in Ecology and Evolution, 2015
Stable isotope data provide insight into the foraging ecology of animals. Traditionally, carbon and nitrogen isotope values have been used to infer dietary and habitat preferences.
Brooke eCrowley, Amanda Dawn Melin, Amanda Dawn Melin, Justin Douglas Yeakel, Justin Douglas Yeakel, Nathaniel Jay Dominy   +5 more
doaj   +1 more source