Results 141 to 150 of about 3,667,411 (200)

Reconstruction of paleoenvironments using carbon stable isotopes of specific compounds

open access: yesAnais da Academia Brasileira de Ciências, 2000
Santos Neto Eugenio V.
doaj  

Food webs in forest and pasture streams in the Waikato region, New Zealand: A study based on analyses of stable isotopes of carbon and nitrogen, and fish gut contents [PDF]

open access: yesNew Zealand Journal of Marine and Freshwater Research, 1997
Stable isotopes of carbon (C) and nitrogen (N) were studied in 11 stream communities in the Waikato region of New Zealand. From comparisons of mean d13C and d15N values, food webs in the shaded, forest streams were clearly based on allochthonous material
Brendan Hicks
exaly   +2 more sources

Stable carbon isotopes in human tissues

Nature, 1978
ON studying the distribution of 14C from nuclear weapon tests in a wide range of human tissues, it was observed that significant modification of 14C/12C isotopic ratio had occurred, largely as a function of variable carbon renewal rates1,2. As a parallel exercise, 13C/12C isotope ratios have been assayed, 13C and 12C being the nonradioactive isotopes ...
T D, Lyon, M S, Baxter
openaire   +2 more sources

Mercury and Stable Isotopes of Carbon and Nitrogen in Mink

Environmental Toxicology and Chemistry, 2007
Abstract Total Hg concentrations and values of stable isotopes (δ15N, δ13C) in tissues of mink (Mustela vison) captured in Rhode Island (USA) during winters of 1999 to 2004 were statistically distinct based on location. Mink captured in salt marsh environments (salt marsh group mink [SMGM]) had significantly lower mean Hg concentrations ...
James L, Lake   +4 more
openaire   +2 more sources

Stable Isotope Geochemistry of Various Carbonates

John Heinrichs Scholarly & Creative Activities Day, 2021
This submission is unavailable.
Jenna Howard   +5 more
openaire   +1 more source

The separation of stable isotopes of carbon

Russian Chemical Reviews, 1989
The present state of work on the separation of carbon isotopes by diffusion, fractional distillation, chemical isotopic exchange, and the selective excitation and dissociation of molecules in electrical discharges or in the field of laser radiation has been examined.
E D Oziashvili, A S Egiazarov
openaire   +1 more source

Stable Carbon and Nitrogen Isotopic

Aquatic Geochemistry, 2004
The perennially ice-covered lakes in the McMurdo Dry Valleys, Antarctica, are part of the coldest and driest ecosystem on earth. To understand lacustrine carbon and nitrogen cycling in this end-member ecosystem, and to define paleolimnological proxies for ice-covered lakes, we measured the stable carbon and nitrogen isotopic composition of particulate ...
Jennifer Lawson   +4 more
openaire   +1 more source

Carbon stable isotopes as indicators of coastal eutrophication

Ecological Applications, 2014
Coastal ecologists and managers have frequently used nitrogen stable isotopes (δ15N) to trace and monitor sources of anthropogenic nitrogen (N) in coastal ecosystems. However, the interpretation of δ15N data can often be challenging, as the isotope values fractionate substantially due to preferential retention and uptake by biota.
Autumn, Oczkowski   +3 more
openaire   +2 more sources

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