Results 21 to 30 of about 2,223,295 (291)

Stable carbon and radiocarbon isotope compositions of particle size fractions to determine origins of sedimentary organic matter in an estuary [PDF]

open access: yes, 2002
Stable and radioactive carbon isotopic compositions of particle size fractions of a surface sediment from the Ems-Dollard estuary vary considerably with particle size. The organic material in the fine fractions (
Megens, L.,   +7 more
core   +1 more source

Diel variations in the carbon isotope composition of respired CO(2) and associated carbon sources: a review of dynamics and mechanisms [PDF]

open access: yes, 2011
Werner C, Gessler A. Diel variations in the carbon isotope composition of respired CO(2) and associated carbon sources: a review of dynamics and mechanisms. Biogeosciences.
Werner, Christiane ; https://orcid.org/   +5 more
core   +2 more sources

Carbon and Oxygen Isotope Analysis of Calcite and Dolomite Mixtures Using Selective Acid Extraction by Gasbench-IRMS [PDF]

open access: yesZhipu Xuebao, 2022
Carbonate cements formed at different stages in sandstone have different mineral compositions, structural characteristics and carbon and oxygen isotope compositions.
HAN Juan   +6 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]

open access: yes, 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   +9 more
core   +1 more source

Structure and flow of carbon and nitrogen to the western Irish Sea Nephrops norvegicus fishery: a stable isotope approach. [PDF]

open access: yes, 2008
PhDStable isotope analysis was used to describe the structure and flow of organic matter (carbon and nitrogen) from primary production in the water column to the benthos, and into secondary production that supports a fishery for the lobster Nephrops ...
Hill, Jacqueline M
core   +4 more sources

A dataset representing the impact of aromatic nuclei on the carbon isotope of gases

open access: yesData in Brief, 2020
This work presents a dataset which provides information on the influence of aromatic nuclei on the carbon isotope of gases. Gases analyzed herein were obtained by pyrolysis of model compounds and kerogens.
Yanhong Liu   +5 more
doaj   +1 more source

Equations for lipid normalization of carbon stable isotope ratios in aquatic bird eggs. [PDF]

open access: yesPLoS ONE, 2014
Stable isotope ratios are biogeochemical tracers that can be used to determine the source of nutrients and contaminants in avian eggs. However, the interpretation of stable carbon ratios in lipid-rich eggs is complicated because (13)C is depleted in ...
Kyle H Elliott   +2 more
doaj   +1 more source

Carbon isotope reversal of desorbed gas in Longmaxi shale of Jiaoshiba area, Sicuhan Basin

open access: yesPetroleum Research, 2017
Through analysis of components and carbon isotope compositions of gas desorbed from shale cores, the carbon isotope reversal phenomenon in the shale gas from the Silurian Longmaxi Formation of Jiaoshiba area in Sichuan Basin were well studied.
Hua Qin   +4 more
doaj   +1 more source

Discussion on genesis of coalbed methane in Fukang Mining Area

open access: yesMeikuang Anquan, 2021
The research area is Fukang Mining Area in the southern margin of Junggar Basin. The gas composition, methane carbon isotope, methane carbon isotope and carbon isotope of CO2 were tested in 10 CBM wells in the research area, and combined with the ...
HAO Huili, WANG Haichao, TIAN Jijun, YANG Shengbo, CHENG Xiaoqian
doaj   +1 more source

The DIC carbon isotope evolutions during CO2 bubbling: Implications for ocean acidification laboratory culture

open access: yesFrontiers in Marine Science, 2022
Ocean acidification increases pCO2 and decreases pH of seawater and its impact on marine organisms has emerged as a key research focus. In addition to directly measured variables such as growth or calcification rate, stable isotopic tracers such as ...
Hongrui Zhang   +4 more
doaj   +1 more source

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