Results 51 to 60 of about 850,264 (263)
Hydrometallurgical extraction of Al and Si from kaolinitic clays [PDF]
Herein is presented the results of a study on the hydrometallurgic extractionand recovery of aluminum and silicon by leaching of kaolinitic clays with HF. Thestudied extraction parameters were: temperature, reaction time, solid/liquid ratio,concentration,
Pinna, Eliana Guadalupe +3 more
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La prensa y las ciencias naturales
El autor explica, en el presente artículo, las posibilidades de la utilización de la prensa como medio de actualización del temario de Ciencias Naturales en octavo de EGB. Partiendo de cuatro suplementos de Ciencia -insertados semanalmente en diferentes periódicos diarios- cuenta la experiencia de todo un curso escolar, en la que el alumnado ha ...
openaire +5 more sources
Middle Darriwilian conodont zones in the uppermost San Juan limestone and the lower member of the Las Aguaditas formation, central Precordillera of San Juan, Argentina [PDF]
The geological province of Precordillera is located in western Argentina. It extends 450 km meridionally and 110 km from east to west (Fig. 1) (Furque and Cuerda, 1979).
Albanesi, Guillermo Luis +2 more
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Amplified singlet oxygen generation in metallated-porphyrin doped conjugated polymer nanoparticles [PDF]
We report on the mechanism and efficiencies of singlet oxygen O2(1Δg) generation of nanoparticles (NP) of the conjugated polymer (CP) poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT) doped with platinum octaethylporphyrin (PtOEP) suspended in water.
Chesta, Carlos Alberto +7 more
core +2 more sources
Supuestos y estimación del tamaño efectivo poblacional
Los efectos de muestreo o endogamia se estudian mediante aproximaciones semejantes siendo sus consecuencias el incremento de la varianza de frecuencias génicas inter-poblacional y la pérdida de variación intra-poblacional, fenómenos vinculados con el ...
Acreche, Noemí
doaj
A new species of Hyalella (Crustacea, Amphipoda, Dogielinotidae) from the Atlantic Forest of Misiones, Argentina [PDF]
The freshwater genus Hyalella Smith, 1874 has a distribution restricted to the Western Hemisphere with most species being found in South America. In this report we describe a new species of Hyalella from the Atlantic Forest of the Misiones province ...
Colla, Maria Florencia +1 more
core +5 more sources
Retardo prenatal de crecimiento (RPC)
El objetivo del presente trabajo fue analizar experimentalmente, el efecto de la reducción del flujo sanguíneo útero placentario sobre el dimorfismo sexual postcraneano.
Luna, Maria E. +7 more
doaj
Acid-sensing ion channels 1a (ASIC1a) inhibit neuromuscular transmission in female mice [PDF]
Acid-sensing ion channels (ASIC) open in response to extracellular acidosis. ASIC1a, a particular subtype of these channels, has been described to have a postsynaptic distribution in the brain, being involved not only in ischemia and epilepsy, but also ...
Colettis, Natalia Claudia +8 more
core +1 more source

