Results 241 to 250 of about 35,458 (292)
Evaluating nitrogen uptake: Methods and applications for plant research. [PDF]
Appl Plant SciPierce E +3 more
europepmc +1 more source
New 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 J Hicks
exaly +2 more sources
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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 +2 more
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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 +2 more
+4 more sources
Fertilizer nitrogen isotope signatures
Isotopes in Environmental and Health Studies, 2007There 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
Nitrogen isotopes in intra-crystal coralline aragonites [PDF]
Chemical Geology, 2013 To assess the preservation of the nitrogen isotope composition in reef corals, nitrogen isotopes in a well-preserved Pliocene fossil coral (located in the Tartaro formation on Luzon Island, Philippines (14°N, 121°E)) and in a modern coral (Kochi, Japan ...
Atsuko Yamazaki +2 more
exaly +2 more sources
Nitrogen Isotopes in the Ocean [PDF]
, 2019 This article outlines the isotope systematics of processes in the ocean nitrogen (N) cycle and their impact on the isotopic compositions of the major N forms, with an eye toward how the N isotopes may record current N fluxes and past changes.
Sigman, Daniel M, Fripiat, François
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Anomalous Nitrogen Isotope Ratio in Comets
Science, 2003High-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 +7 more
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Mercury and Stable Isotopes of Carbon and Nitrogen in Mink
Environmental Toxicology and Chemistry, 2007Abstract 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
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Isotopic Analysis of Dissolved Organic Nitrogen in Soils
Analytical Chemistry, 2010Determination of the isotopic signature of dissolved organic nitrogen (DON) is important to assess its dynamics in terrestrial ecosystems. Analysis of (15)N-DON, however, has been hindered by the lack of simple, reliable, and established methods. We evaluate three off-line techniques for measuring the (15)N signature of DON in the presence of inorganic
Ros, G.H. +2 more
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