Results 21 to 30 of about 52,149 (242)

Isotope Engineering of Carbon Nanotube Systems [PDF]

open access: yesPhysical Review Letters, 2005
4 pages, 4 ...
Simon, F.   +7 more
openaire   +3 more sources

Combined use of stable isotopes and fallout radionuclides as soil erosion indicators in a forested mountain site, South Korea [PDF]

open access: yes, 2013
The aim of this study is to assess and to validate the suitability of the stable nitrogen and carbon isotope signature as soil erosion indicators in a mountain forest site in South Korea.
Mabit, L.   +9 more
core   +1 more source

Carbon Isotopic Measurements of Nanotubes to Differentiate Carbon Sources [PDF]

open access: yesACS Omega, 2019
Stable carbon isotope (δ(13C)) analysis can provide information concerning the starting materials and the production process of a material. Carbon nanotubes (CNTs) are produced using a variety of starting materials, catalysts, and production methods.
Chartrand, Michelle M. G.   +3 more
openaire   +3 more sources

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

Isotopic Composition of Carbon in Vinegars

open access: yesJournal of AOAC INTERNATIONAL, 1985
Abstract Measurements of δ13C and 14C-activity were performed on vinegars from various known sources. Natural vinegar can be distinguished from petrochemical acetic acid by 14C-analysis: Natural vinegar currently gives values of > 112% of modern activity; petrochemical acetic acid yields values of 0% of modern activity.
D A, Krueger, H W, Krueger
openaire   +2 more sources

d13C tracing of dissolved inorganic carbon sources in Patagonian rivers (Argentina) [PDF]

open access: yes, 2005
The main Patagonian rivers (Colorado, Negro, Chubut, Deseado, Coyle, Chico, Santa Cruz and Gallegos) were sampled between September 1995 and November 1998 to determine their chemical and isotopic compositions, the origins of the suspended and dissolved ...
F. Brunet   +17 more
core   +1 more source

The Emergence of Carbon Isotope Exchange

open access: yesAngewandte Chemie International Edition, 2019
Significant progress in C-C bond activation with transition metals has recently enabled the development of several carbon isotope exchange reactions. These methods are based on C-C bond decarboxylative carboxylation reactions in the presence of selected transition metals and labelled carbon monoxide or carbon dioxide.
Hinsinger, Karen, Pieters, Gregory
openaire   +3 more sources

Tumour–host interactions in Drosophila: mechanisms in the tumour micro‐ and macroenvironment

open access: yesMolecular Oncology, EarlyView.
This review examines how tumour–host crosstalk takes place at multiple levels of biological organisation, from local cell competition and immune crosstalk to organism‐wide metabolic and physiological collapse. Here, we integrate findings from Drosophila melanogaster studies that reveal conserved mechanisms through which tumours hijack host systems to ...
José Teles‐Reis, Tor Erik Rusten
wiley   +1 more source

Environmental controls on the stable isotopic composition of Mercenaria mercenaria: Potential application to paleoenvironmental studies [PDF]

open access: yes, 2003
We have investigated the environmental controls of seasonally resolved records of oxygen and carbon isotopes of modern Mercenaria mercenaria bivalves collected live from five coastal sites along the east coast of North America.
Linsley, B. K.   +3 more
core   +1 more source

Sudden anaerobization in Amphibacillus xylanus increases intracellular labile ferrous iron and inhibits cell growth

open access: yesFEBS Open Bio, EarlyView.
Abruptly changing from aerobic to anaerobic conditions (sudden anaerobization) induced growth inhibition and a significant increase in intracellular labile ferrous iron in the aerotolerant anaerobe Amphibacillus xylanus. We found that free flavins mediate efficient electron transfer from NADH to ferric iron under anaerobic conditions, suggesting that ...
Shinya Kimata   +13 more
wiley   +1 more source

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