Results 21 to 30 of about 744 (171)

On the Origin of the Brain Semi‐Heavy Water Deuterium MR Signal Following Administration of Deuterated Metabolic Substrate: A Cautionary Tale

open access: yesMagnetic Resonance in Medicine, Volume 96, Issue 2, Page 862-870, August 2026.
ABSTRACT Purpose To evaluate the extent to which the appearance of HOD in the brain following systemic administration of a deuterated substrate is due to local brain metabolism versus body metabolism. Methods [6,6‐2H2]glucose, which is transported across the blood‐brain barrier (BBB), and [6,6‐2H2]fructose (Fruc), which does not cross the BBB, were ...
Joseph J. H. Ackerman   +5 more
wiley   +1 more source

Mapeo de los humedales de Palo Verde, Costa Rica

open access: yesCiencias Ambientales, 1992
No disponible/Not ...
Juan Bravo, Teresita Flores, Ileana Mora
doaj   +1 more source

Sediment transport on the Palos Verdes shelf, California [PDF]

open access: yesContinental Shelf Research, 2010
This paper is not subject to U.S. copyright. The definitive version was published in Continental Shelf Research 30 (2010): 761-780, doi:10.1016/j.csr.2010.01.011.
Ferré, Bénédicte   +2 more
openaire   +3 more sources

Composición bioquímica y mineral de especies vegetales consumidas por cabras en pastoreo en tres temporadas del año

open access: yesRevista Mvz Cordoba
Objetivo. Determinar y comparar la composición bioquímica y mineral de las especies vegetales que consumen las cabras en pastoreo en tres temporadas del año (sequia, lluvia y transición). Materiales y Métodos.
Víctor Abrahán Salgado-Beltrán   +5 more
doaj   +1 more source

Fenología reproductiva de anuros en humedales del bosque tropical seco de Costa Rica

open access: yesCiencias Ambientales, 2012
Los humedales estacionales del Pacífico norte de Costa Rica constituyen ambientes de extrema importancia en el mantenimiento de una gran diversidad biológica, siendo los principales sitios reproductivos de la mayoría de los anfibios y de varias especies
Gabriela Mora   +6 more
doaj   +1 more source

Phylogenetic analysis and the recognition of a new genus for Mexican Crassulaceae segregated from Echeveria

open access: yesTAXON, Volume 75, Issue 3, June 2026.
Abstract Systematic knowledge of the Mexican Crassulaceae is slowly progressing as data from new DNA regions and species sampling efforts increase. We compiled and generated new rbcL, matK, rps16, ITS/ITS2, and ETS DNA sequences and performed an updated phylogenetic reconstruction for a group of 131 Mexican Crassulaceae terminals from 11 of the 13 ...
Luis Emilio de la Cruz‐López   +1 more
wiley   +1 more source

Oxidative evaluation of oils mixture of legumes of the Sonoran Desert with maize and soy oils during the storage

open access: yesGrasas y Aceites, 2001
During storage, oils from seeds of wild legumes of the Sonoran Desert have shown greater stability than oils derived from conventional sources. In this work, oxidation process was evaluated during the storage (122 day) of mixtures of oils: Mezquite ...
M. Ortega-Nieblas   +2 more
doaj   +1 more source

Mass mortality of saguaros (Carnegiea gigantea) from windthrow: A rare, demographic disturbance in a desert ecosystem

open access: yesEcosphere, Volume 17, Issue 5, May 2026.
Abstract Windthrow is a significant disturbance in many forests globally during which strong winds damage trees or other large flora, yet its role in arid ecosystems remains largely understudied. The saguaro cactus (Carnegiea gigantea), a keystone species of the Sonoran Desert, is a long‐lived, massive succulent whose demography is primarily thought to
Don E. Swann   +3 more
wiley   +1 more source

Secondary Seed Ingestion in Snakes: Germination Frequency and Rate, Seedling Viability, and Implications for Dispersal in Nature

open access: yesFrontiers in Ecology and Evolution, 2022
The importance of vertebrate animals as seed dispersers (zoochory) has received increasing attention from researchers over the past 20 years, yet one category in particular, diploendozoochory, remains understudied.
Gordon W. Schuett   +12 more
doaj   +1 more source

Composición química y precursores de ácidos vaccénico y ruménico en especies forrajeras en Baja California Sur, México

open access: yesRevista Mexicana de Ciencias Pecuarias, 2014
Los rumiantes pequeños que pastorean la vegetación nativa seleccionan su dieta a partir de una amplia variedad de especies vegetales, que difieren en su contenido y disponibilidad de nutrientes durante el año, y son fuente importante de nutrientes.
Eduardo Alberto Toyes Vargas   +4 more
doaj  

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