scholarly journals Carbon and nitrogen isotope fractionation of amino acids in an avian marine predator, the gentoo penguin ( Pygoscelis papua )

2015 ◽  
Vol 5 (6) ◽  
pp. 1278-1290 ◽  
Author(s):  
Kelton W. McMahon ◽  
Michael J. Polito ◽  
Stephanie Abel ◽  
Matthew D. McCarthy ◽  
Simon R. Thorrold
Keyword(s):  
Amino Acids ◽  
Isotope Fractionation ◽  
Nitrogen Isotope ◽  
Gentoo Penguin ◽  
Pygoscelis Papua ◽  
Carbon And Nitrogen ◽  
Marine Predator ◽  
Nitrogen Isotope Fractionation

scholarly journals Mineral identity, natural organic matter, and repeated contaminant exposures do not affect the carbon and nitrogen isotope fractionation of 2,4-dinitroanisole during abiotic reduction

2019 ◽  
Vol 21 (1) ◽  
pp. 51-62 ◽  
Author(s):  
Matthew J. Berens ◽  
Bridget A. Ulrich ◽  
Jennifer H. Strehlau ◽  
Thomas B. Hofstetter ◽  
William A. Arnold
Keyword(s):  
Organic Matter ◽  
Carbon Isotopes ◽  
Natural Organic Matter ◽  
Isotope Fractionation ◽  
Nitrogen Isotope ◽  
Carbon And Nitrogen ◽  
Nitrogen Isotope Fractionation ◽  
Abiotic Reduction ◽  
Hydrolysis Reactions

The fractionation of nitrogen and carbon isotopes during the reduction of 2,4-dinitroanisole is substantially different than that observed for hydrolysis reactions.

An experimental study on variations in stable carbon and nitrogen isotope fractionation during growth of Mysis mixta and Neomysis integer

1999 ◽  
Vol 56 (11) ◽  
pp. 2203-2210 ◽  
Author(s):  
Elena Gorokhova ◽  
Sture Hansson
Keyword(s):  
Isotopic Composition ◽  
Muscle Tissue ◽  
Isotope Fractionation ◽  
Nitrogen Isotope ◽  
Abdominal Muscle ◽  
Neomysis Integer ◽  
Carbon And Nitrogen ◽  
Mysis Mixta ◽  
Nitrogen Isotope Fractionation ◽  
Isotopic Signal

The trophic isotope fractionation of mysids, in response to a change in the isotopic composition in their diet, was examined in the laboratory. Field-caught Mysis mixta and Neomysis integer had similar δ13C values, ranging between -23.1 and -21.5‰. They also had similar δ15N values, and for both species, this value increased with body size. Experimental starvation did not change the isotopic composition. To test for metabolic fractionation of isotopes, the mysids were fed different diets, newly hatched Artemia and detrital Enteromorpha. The isotopic composition was monitored in abdominal muscle tissue, exoskeleton, and feces over 12 weeks. The δ13C composition in muscle tissue had not reached an isotopic equilibrium with the diet at the end of the experiment, while the exoskeleton came into equilibrium with the food in 2-3 weeks. Muscle was enriched in 15N relatively to the food, +3.6‰ for Artemia and +2.7‰ for Enteromorpha. The isotopic composition in muscle, exuviae, and feces may form a basis for diet reconstruction of mysids. The feces δ13C and δ15N values mirror the diet over the last few hours, exuviae δ13C values represent nutrients metabolized 2-3 weeks ago, and muscle tissue integrates the isotopic signal over a relatively long period.

Nitrogen isotope fractionation during the reduction of NO3− to NH4+ by Desulfovibrio sp.

1983 ◽  
Vol 29 (2) ◽  
pp. 231-234 ◽  
Author(s):  
R. G. L. McCready ◽  
W. D. Gould ◽  
R. W. Barendregt
Keyword(s):  
Isotope Fractionation ◽  
Nitrogen Isotope ◽  
Initial Sample ◽  
Minimum Value ◽  
Nitrogen Isotope Fractionation ◽  
Reductive Process

Desulfovibrio reduce NO3−to NH4+ via a dissimilatory pathway. In 21 days, four strains of Desulfovibrio reduced 36–48% of the available NO3− to ammonium. During this reductive process extensive nitrogen isotope fractionation occurred: the product NH4+ was enriched in 15N in the initial sample, then became enriched in 14N to a minimum value at approximately 20–25% reaction, and then became isotopically heavier as the reaction proceeded.

Substituent Effects on Nitrogen Isotope Fractionation During Abiotic Reduction of Nitroaromatic Compounds

2008 ◽  
Vol 42 (6) ◽  
pp. 1997-2003 ◽  
Author(s):  
Thomas B. Hofstetter ◽  
Anke Neumann ◽  
William A. Arnold ◽  
Akané E. Hartenbach ◽  
Jakov Bolotin ◽  
...  
Keyword(s):  
Isotope Fractionation ◽  
Substituent Effects ◽  
Nitrogen Isotope ◽  
Nitroaromatic Compounds ◽  
Nitrogen Isotope Fractionation ◽  
Abiotic Reduction
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