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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1947 4
1948 5
1949 21
1950 1
1951 3
1952 1
1953 2
1956 1
1957 1
1959 1
1961 3
1962 26
1963 767
1964 1584
1965 1353
1966 1567
1967 3310
1968 4394
1969 4743
1970 5122
1971 5689
1972 6457
1973 4000
1974 170
1975 87
1976 53
1977 51
1978 49
1979 42
1980 57
1981 53
1982 90
1983 60
1984 80
1985 95
1986 95
1987 107
1988 107
1989 146
1990 207
1991 199
1992 196
1993 201
1994 253
1995 281
1996 268
1997 310
1998 392
1999 400
2000 424
2001 529
2002 602
2003 646
2004 787
2005 896
2006 832
2007 907
2008 875
2009 903
2010 832
2011 949
2012 1016
2013 1015
2014 936
2015 874
2016 710
2017 683
2018 693
2019 389
2020 15
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56,916 results
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Page 1
Stable carbon and nitrogen isotopes in kukui (Aleurites moluccanus) endocarp along rainfall and elevation gradients: Archaeological implications.
Lincoln NK, et al. PLoS One 2018. PMID 30325930 Free PMC article.
Stable carbon and nitrogen isotopes are often used to make inferences of past environments and social patterns. We analyze δ 13C and δ 15N values in contemporary kukui (Aleurites moluccanus) endocarp to examine the effects of site environment. Results from across environmental transects on Hawai'i Island show strong patterns for both stable isotopes. For δ 13C a robust linear relationship with elevation is exhibited, strengthened by the inclusion of rainfall. ...
Stable carbon and nitrogen isotopes are often used to make inferences of past environments and social patterns. We analyze δ 1 …
Hyperpolarized 13C MRI: State of the Art and Future Directions
Wang ZJ, et al. Radiology 2019 - Review. PMID 30835184 Free PMC article.
Hyperpolarized (HP) carbon 13 ((13)C) MRI is an emerging molecular imaging method that allows rapid, noninvasive, and pathway-specific investigation of dynamic metabolic and physiologic processes that were previously inaccessible to imaging. ...
Hyperpolarized (HP) carbon 13 ((13)C) MRI is an emerging molecular imaging method that allows rapid, noninvasive, and pathway-specifi …
Use of carbon stable isotopes to monitor biostimulation and electron donor fate in chromium-contaminated groundwater.
Bill M, et al. Chemosphere 2019. PMID 31272004
Concentrations and carbon isotope ratios of metabolites, including dissolved inorganic carbon and total organic carbon, and compound-specific analysis of acetate and propionate, together with phospholipid fatty acids (biomass) have been analyzed to help provide an understanding of the predominant redox processes accompanying Cr(VI) reduction. ...Carbon isotope data indicate carbon transfers from the original substrate to organic byproducts and mineralized carbon. Concentrations of metabolites and stable isotope data as well as carbon isotope mass balance calculations were used to monitor biologically mediated reduction of Cr(VI)....
Concentrations and carbon isotope ratios of metabolites, including dissolved inorganic carbon and total organic carb
Measurement of Adjuncts in Hard Ciders Obtainable in the United States Using Carbon Isotopes.
Singerling SA, et al. J Agric Food Chem 2018. PMID 30339029
The carbon isotope compositions (δ(13)C values) of 23 hard ciders obtainable in the United States were analyzed to detect adjuncts, specifically added C(4) sugars (i.e., corn syrup and cane sugar). ...The labeled ingredients of ciders were found to be inconsistent with the carbon isotope ratios. A higher proportion of imported ciders studied had no isotopic evidence of added C(4)-based sweetener, while most domestic ciders had elevated δ(13)C values, indicative of C(4)-based sugar additives. ...
The carbon isotope compositions (δ(13)C values) of 23 hard ciders obtainable in the United States were analyzed to detect adju …
New radical methods for the potential synthesis of carbon-13 and carbon-14 labeled complex products.
Maxwell BD. J Labelled Comp Radiopharm 2018 - Review. PMID 30156329
As such, isotope chemists need to continually add new isotopic methods to their armamentarium to successfully label complex molecules with carbon-13 and carbon-14. Recently, there has been a surge in the use of radicals to form new carbon-carbon bonds and for the incorporation of functional groups which can be used to incorporate isotopically labeled carbons. ...
As such, isotope chemists need to continually add new isotopic methods to their armamentarium to successfully label complex mo …
Ex vivo and in vivo stable isotope labelling of central carbon metabolism and related pathways with analysis by LC-MS/MS.
Yuan M, et al. Nat Protoc 2019. PMID 30683937
Here, we present a protocol for analysing incorporation of the non-radioactive stable isotopes carbon-13 ((13)C) and nitrogen-15 ((15)N) into polar metabolites in central carbon metabolism and related pathways. Our platform utilizes selected reaction monitoring (SRM) with polarity switching and amide hydrophilic interaction liquid chromatography (HILIC) to capture transitions for carbon and nitrogen incorporation into selected metabolites using a hybrid triple quadrupole (QQQ) mass spectrometer. ...
Here, we present a protocol for analysing incorporation of the non-radioactive stable isotopes carbon-13 ((13)C) and nitrogen- …
Interpretation of bulk nitrogen and carbon isotopes in archaeological foodcrusts on potsherds.
Yoneda M, et al. Rapid Commun Mass Spectrom 2019. PMID 30919538
While the carbon isotope ratios in those materials are useful in detecting the usage of C(4) plants, the reliability of nitrogen isotopic signatures has not been fully investigated. ...Samples from the outer surface produced less meaningful isotopic and elemental ratios altered by a thermal effect and/or contamination from soot. ...
While the carbon isotope ratios in those materials are useful in detecting the usage of C(4) plants, the reliability of nitrog …
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