Results 201 to 210 of about 128,824 (253)

Stability of the marine nitrogen cycle over the past 165 million years. [PDF]

Nat Commun
Godfrey LV, Omta AW, Tziperman E, Li X, Hu Y, Falkowski PG.   +5 more
europepmc   +1 more source

Assessment of decadal changes in coastal nitrogen sources in NW Spain with stable isotopes in macroalgae and mussels. [PDF]

PLoS One
Bode A, García-Seoane R, Varela Z, Viana IG.   +3 more
europepmc   +1 more source

Isotopic fractionation of 15N in nitrogen fixation in soybean due to light intensity and Bradyrhizobium spp. strain inoculated

, 2014
Karla Emanuelle Campos Araújo
openalex   +1 more source

Reassessing the nitrogen isotope composition of sediments from the proto-North Atlantic during Oceanic Anoxic Event 2

, 2014
I. Ruvalcaba, Niels A. G. M. van Helmond, I. Tsandev, J.B.M. Middelburg, Caroline P. Slomp   +4 more
openalex   +1 more source

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Nitrogen Isotope Techniques

Choice Reviews Online, 1993
Introduction. Mass Spectrometry. Optical Emmission Spectrometry. Natural Abundance of 15N: Fractional Contribution of Two Sources to a Common Sink an Use of Isotope Discrimination. Nitrogen Fixation in Soil and Plant Systems. Nitrogen Fixation in Flooded Rice Soils, Aquatic and Sediment Systems. Nitrification and Dentrification.
J. I. Sprent, R. Knowles, T. H. Blackburn   +2 more
  +4 more sources

Fertilizer nitrogen isotope signatures

Isotopes in Environmental and Health Studies, 2007
There has been considerable recent interest in the potential application of nitrogen isotope analysis in discriminating between organically and conventionally grown crops. A prerequisite of this approach is that there is a difference in the nitrogen isotope compositions of the fertilizers used in organic and conventional agriculture.
Bateman, Alison S., Kelly, Simon D.
openaire   +3 more sources

Anomalous Nitrogen Isotope Ratio in Comets

Science, 2003
High-resolution spectra of the CN B 2 ∑ + – X 2 ∑ + (0,0) band at 390 nanometers yield isotopic ratios for comets C/1995 O1 (Hale-Bopp) and C/2000 WM1 (LINEAR) as follows: 165 ± 40 and 115 ± 20 for 12
Arpigny, Claude, Jehin, Emmanuel, Manfroid, Jean, Hutsemekers, Damien, Schulz, Rita, Stüwe, J. A., Zucconi, Jean-Marc, Ilyin, Ilya   +7 more
openaire   +2 more sources

Isotope fractionation during nitrogen remineralization (ammonification): Implications for nitrogen isotope biogeochemistry

Geochimica et Cosmochimica Acta, 2013
Abstract The 15 N/ 14 N isotopic ratio of marine particulate organic matter usually increases as a consequence of preferential 14 N-remineralization (ammonification) during decay in the oxic water-column and at the oxic seafloor. However, a fractionation factor 15 e of sediment ammonification in natural environments has not been determined yet ...
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, Peter T Doran, Fabien Kenig, David J Des marais, John C Priscu   +4 more
openaire   +1 more source

Isotopic disproportionation during hydrogen isotopic analysis of nitrogen‐bearing organic compounds

Rapid Communications in Mass Spectrometry, 2015
Rationale High‐precision hydrogen isotope ratio analysis of nitrogen‐bearing organic materials using high‐temperature conversion (HTC) techniques has proven troublesome in the past. Formation of reaction products other than molecular hydrogen (H 2
Nair, S., Geilmann, H., Coplen, T., Qi, H., Gehre, M., Schimmelmann, A., Brand, W.   +6 more
openaire   +3 more sources