Results 21 to 30 of about 197,924 (340)

Effects of Upwelling Intensity on Nitrogen and Carbon Fluxes through the Planktonic Food Web off A Coruña (Galicia, NW Spain) assessed with Stable Isotopes

open access: yesDiversity, 2020
The input of new nutrients by upwelling in shelf waters, and the associated carbon and nitrogen fluxes, can be traced by their stable isotope signatures in organic matter.
Antonio Bode   +2 more
doaj   +1 more source

Research Progress on Spatiotemporal Distribution Characteristics of Carbon Stable Isotopes in Wines from New and Old World Countries [PDF]

open access: yesShipin Kexue, 2023
With the continuous development of economic globalization, the production and consumption of wine in New and Old World countries have shown a steady growth trend. Wines of different grades and styles have been developed, which are related to geographical
MA Yanfei, SU Yingyue, WANG Lishan, QI Pengyu, KANG Tianhao, WANG Li, MA Haiyan, XU Guoqian, ZHANG Ang
doaj   +1 more source

Fatty acid stable isotopes add clarity, but also complexity, to tracing energy pathways in aquatic food webs

open access: yesEcosphere, 2021
Tracing the flow of dietary energy sources, especially in systems with a high degree of omnivory, is an ongoing challenge in ecology. In aquatic systems, one of the persistent challenges is in differentiating between autochthonous and allochthonous ...
Ariana M. Chiapella   +2 more
doaj   +1 more source

Terrestrial and fluvial carbon fluxes in a tropical watershed: Nyong basin, Cameroon [PDF]

open access: yes, 2009
The Nyong watershed, with an area of 27 800 km2 and a mean annual discharge of 390 m3 s−1, is the second largest river in Cameroon. The Nyong watershed serves as an outstanding study area for the examination of carbon fluxes in humid tropical ...
Boeglin, Jean-Loup   +6 more
core   +2 more sources

Measurement of excited states in 40Si and evidence for weakening of the N=28 shell gap [PDF]

open access: yes, 2006
Excited states in 40Si have been established by detecting gamma-rays coincident with inelastic scattering and nucleon removal reactions on a liquid hydrogen target.
A. Gade   +20 more
core   +2 more sources

Carbon and oxygen isotope variation and its implication for marine sequence: A case study of Ordovician in Tarim Basin

open access: yesPetroleum Research, 2017
Carbon and oxygen isotopes of marine carbonate rocks or fossil shells could indicate global sea-level relative change. Generally, heavier carbon isotopes or lighter oxygen isotopes reflected rise of global sea-level relative changes, and vice versa.
Zongju Zhao, Jianguo Wang, Peixi Wang
doaj   +1 more source

Factors influencing the stable carbon isotopic composition of suspended and sinking organic matter in the coastal Antarctic sea ice environment [PDF]

open access: yes, 2011
A high resolution time-series analysis of stable carbon isotopic signatures in particulate organic carbon (&delta;<sup>13</sup>C<sub>POC</sub>) and associated biogeochemical parameters in sea ice and surface waters provides an
Annett, A.L.   +9 more
core   +7 more sources

Dual stable isotope abundances unravel trophic position of estuarine nematodes [PDF]

open access: yes, 2005
The role and quantitative importance of free-living nematodes in marine and estuarine soft sediments remain enigmatic for lack of empirical evidence on the feeding habits and trophic position of most nematode species.
BOUILLON, S, GALLUCCI, F, Moens, Tom
core   +1 more source

Tracing the Deep Carbon Cycle Using Metal Stable Isotopes: Opportunities and Challenges

open access: yesEngineering, 2019
The subduction of marine carbonates and carbonated oceanic crust to the Earth’s interior and the return of recycled carbon to the surface via volcanism may play a pivotal role in governing Earth’s atmosphere, climate, and biosphere over geologic time ...
Sheng-Ao Liu, Shu-Guang Li
doaj   +1 more source

Can Mg isotopes be used to trace cyanobacteria-mediated magnesium carbonate precipitation in alkaline lakes? [PDF]

open access: yes, 2011
The fractionation of Mg isotopes was determined during the cyanobacterial mediated precipitation of hydrous magnesium carbonate precipitation in both natural environments and in the laboratory.
Balor, S.   +8 more
core   +4 more sources

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