Results 11 to 20 of about 35,458 (292)

Convergence of soil nitrogen isotopes across global climate gradients. [PDF]

Sci Rep, 2015
Quantifying global patterns of terrestrial nitrogen (N) cycling is central to predicting future patterns of primary productivity, carbon sequestration, nutrient fluxes to aquatic systems, and climate forcing.
Craine JM, Elmore AJ, Wang L, Augusto L, Baisden WT, Brookshire EN, Cramer MD, Hasselquist NJ, Hobbie EA, Kahmen A, Koba K, Kranabetter JM, Mack MC, Marin-Spiotta E, Mayor JR, McLauchlan KK, Michelsen A, Nardoto GB, Oliveira RS, Perakis SS, Peri PL, Quesada CA, Richter A, Schipper LA, Stevenson BA, Turner BL, Viani RA, Wanek W, Zeller B.   +28 more
europepmc   +2 more sources

Interstellar nitrogen isotope ratios [PDF]

Symposium - International Astronomical Union, 1985
We report first results of a systematic study of the galactic interstellar nitrogen isotope ratios, based upon measurements of the (J,K) = (1,1) and (2,2) lines of the 14NH3 and 15NH3 molecules. We find significant deviations of the [14N]/[15N3] abundance ratio from the solar-system value (~270), with the most extreme enrichment in the galactic-center ...
R. Güsten, H. Ungerechts
openaire   +1 more source

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

Freezing and chemical preservatives alter the stable isotope values of carbon and nitrogen of the Asiatic clam (Corbicula fluminea) [PDF]

, 2010
We tested the impacts of most common sample preservation methods used for aquatic sample materials on the stable isotope ratios of carbon and nitrogen in clams, a typical baseline indicator organism for many aquatic food web studies utilising stable ...
Dorothée Kopp, Aurélia Martino, Santoul, Frédéric, Céréghino, Régis, Frédéric Santoul, Kopp, Dorothée, Régis Céréghino, Syväranta, Jari, Jari Syväranta, Martino, Aurelia   +9 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