Results 1 to 10 of about 792,425 (354)
USING STABLE ISOTOPES TO ESTIMATE TROPHIC POSITION: MODELS, METHODS, AND ASSUMPTIONS
Ecology, 2002 The stable isotopes of nitrogen (8'5N) and carbon (8'3C) provide powerful tools for estimating the trophic positions of and carbon flow to consumers in food webs; however, the isotopic signature of a consumer alone is not generally sufficient to infer ...
David M Post
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The Isotopes of Antimony [PDF]
Nature, 1922 OWING to the kindness of Prof. G. T. Morgan, who prepared a specimen of pure antimony trimethyl for this purpose, I have now been able to obtain the mass-spectrum of antimony. The element is characterised by two lines of nearly equal strength at 121, 123. The first is the more intense by perhaps 10 to 20 per cent.
F. W. Aston
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Stable isotopes in atmospheric water vapor and applications to the hydrologic cycle
Reviews of Geophysics, 2016 Joseph Galewsky +2 more
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Cahiers Agricultures, 2023 La dégradation de la fertilité des sols est un problème majeur en Afrique subsaharienne. La forte croissance démographique, la demande locale de nourriture et la réduction des terres arables disponibles risquent d’accroître ce phénomène.
Ramarovahoaka Noelly +9 more
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Astronomische Nachrichten, 2014 AbstractThe measurement of isotopic ratios provides a privileged insight both into nucleosynthesis and into the mechanisms operating in stellar envelopes, such as gravitational settling. In this article, we give a few examples of how isotopic ratios can be determined from high‐resolution, high‐quality stellar spectra.
Caffau, E. +6 more
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The Isotopes of Americium [PDF]
Physical Review, 1950 Three new americium activities (Am{sup 238}?, Am{sup 243}, and Am{sup 244?}, the latter two formed by n,{gamma} reactions) are described and some additional information is given on previously reported americium isotopes.
Street, K, Jr., Ghiorso, A, Seaborg, G T
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On isotopisms and strong isotopisms of commutative presemifields [PDF]
Journal of Algebraic Combinatorics, 2011 In this paper we prove that the $P(q,\ell)$ ($q$ odd prime power and $\ell>1$ odd) commutative semifields constructed by Bierbrauer in \cite{BierbrauerSub} are isotopic to some commutative presemifields constructed by Budaghyan and Helleseth in \cite{BuHe2008}.
MARINO, Giuseppe, POLVERINO, Olga
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Journal of Agriculture and Rural Development in the Tropics and Subtropics, 2020 Sequestration of soil organic carbon (SOC) in agricultural systems is a key indicator of soil fertility improvement and climate change mitigation at the global scale.
Narindra Harisoa Rakotovao +5 more
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