Results 191 to 200 of about 70,737 (245)

Source attribution of carbonaceous fraction of particulate matter in the urban atmosphere based on chemical and carbon isotope composition. [PDF]

Sci Rep
Skiba A, Styszko K, Tobler A, Casotto R, Gorczyca Z, Furman P, Samek L, Wideł D, Zimnoch M, Kasper-Giebl A, Slowik JG, Daellenbach KR, Prevot ASH, Różański K.   +13 more
europepmc   +1 more source

The carbon isotope ratio of breath is elevated by short-term and long-term added sugar and animal protein intake in a controlled feeding study. [PDF]

Am J Clin Nutr
O'Brien DM, Freedman LS, Rivera P, Merriman S, Sági-Kiss V, Palma-Duran SA, Barrett B, Commins J, Kipnis V, Tasevska N.   +9 more
europepmc   +1 more source

Comparison of Carbon Isotope Ratio Measurement of the Vanillin Methoxy Group by GC-IRMS and ¹³C-qNMR. [PDF]

J Am Soc Mass Spectrom
Greule M, Le PM, Meija J, Mester Z, Keppler F.   +4 more
europepmc   +1 more source

Why leaves become isotopically lighter than photosynthetic carbon isotope discrimination explains: on the importance of post-photosynthetic fractionation. [PDF]

J Exp Bot
Gessler A.
europepmc   +1 more source

Correction to: Purity Assessment of Honey Based on Compound Specific Stable Carbon Isotope Ratios Obtained by LC-IRMS. [PDF]

J AOAC Int
europepmc   +1 more source

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Carbon and oxygen isotope microanalysis of carbonate

Rapid Communications in Mass Spectrometry, 2009
Abstract Technical modification of the conventional method for the δ 13 C and δ 18 O analysis of 10–30 µg carbonate samples is described.
Tatiana A, Velivetskaya, Alexander V, Ignatiev, Sergey A, Gorbarenko   +2 more
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Carbon Isotope Abundance in Meteoritic Carbonates

Science, 1963
The C 13 /C 12 ratio in the carbonate minerals of Orgueil, a carbonaceous chondrite, is 6 percent greater than the ratio in any known terrestrial carbon. The effect may be produced by a chemical isotope fractionation involving processes not common on earth, or it may be the result of ...
openaire   +2 more sources

Deuterium Isotope Effect on Carbon Isotope Fractionation in Photosynthesis

Science, 1967
Plants grown in D 2 O show a decreased tendency to fractionate carbon-13 during photosynthetic incorporation of carbon dioxide. The isotopic ratio C 13 /C 12 of the tissues of deuterated plants appears to be proportional to the deuterium content of the tissue.
R A, Uphaus, J J, Katz
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The carbon-isotope signature of diagenetic carbonates

2020
<p>Diagenetic carbonates often show large variations in their carbon isotope compositions. Variations are mainly the result of isotope fractionation effects during microbial metabolic processes, and these processes themselves may induce carbonate formation.
Patrick Meister, Carolina Reyes
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Carbon Isotopes and Microbial Sediments

2000
Microbial sediments of the biolaminated type, generated by the matting behavior of preferentially prokaryotic microbenthos, commonly carry the isotopic signatures of both the primary microbial biomass and of the carbonate of the surrounding sediment matrix.
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