Browsing Articulos, Pre-prints (Facultad de Ciencias) by Title
Now showing items 415-434 of 488
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Structural refinement of the ternary chalcogenide compound Cu2GeTe3 by X-ray powder diffraction
(SABER ULA, 2007-03-28)Structural refinement of the ternary chalcogenide compoundCu2GeTe3 by X-ray powder diffraction Delgado, Gerzon E.; Mora, Asiloé J.; Pirela, María, Velásquez-Velásquez, Ana, Villarreal, Manuel; Fernández, Braulio ... -
Structure-Activity Relationship (SAR) studies of benzoxazinones, their degradation products, and analogues.
(SABER ULA, 2007-04-09)Structure-activity relationship (SAR) studies of benzoxazinones, their degradation products, and analogues. Phytotoxicity on problematic weeds Avena fatua L. and Lolium rigidum Gaud. (Macías, Francisco A.; Marín, David; ... -
Structure-Activity Relationship Studies of Benzoxazinones and Related Compounds. Phytotoxicity on Echinochloa crus-galli (L.) P. Beauv.
(SABER ULA, 2005-07-27)Structure-Activity Relationship Studies of Benzoxazinones and Related Compounds. Phytotoxicity on Echinochloa crus-galli (L.) P. Beauv (Macías, Francisco A.; Chinchilla, Nuria; Varela, Rosa M.; Oliveros, Alberto; Marín, ... -
Structure-Activity Relationships (SAR) studies of Benzoxazinones, their degradation products and analogues. Phytotoxicity on Standard Target Species (STS).
(SABER ULA, 2008-07-15)Structure-Activity Relationships (SAR) studies of Benzoxazinones, their degradation products and analogues. Phytotoxicity on Standard Target Species (STS) (Macías, Francisco A.; Marín, David; Oliveros, Alberto; Castellano, ... -
Supernovae: Where and why do they break off?
(SABER ULA, 2005-12-08)Supernovae: Where and why do they break off? (Herrera, L.; Núñez, Luis) Abstract The precise mechanism whereby gravitational collapse leads to a type II supernova event is one of the most controversial points in the ... -
Supersymmetry and large-scale left-right symmetry
(SABER ULA, 2005-01-06)Supersymmetry and large-scale left-right symmetry (Melfo, Alejandra; Aulakh, Charanjit S.; Rasin, Andrija; Senjanovic, Goran) Abstract We show that the low energy limit of the minimal supersymmetric Left-Right models ... -
Supervivencia de formas de cultivo de Trypanosoma cruzi en alimentos experimentalmente contaminados
(Boletín de malariología y salud ambiental. Vol. XLVIII, Nº 1, enero-julio, 2008, 2008-07)Se registra la supervivencia de formas de cultivo de Trypanosoma cruzi en alimentos experimentalmente contaminados. En 8 de 11 (73%) muestras de frutas y hortalizas utilizadas en los experimentos los parásitos permanecieron ... -
Supervivencia e infectividad de formas metacíclicas de Trypanosoma cruzi en alimentos experimentalmente contaminados
(2011-12-13)Se registra el tiempo de supervivencia de formas metacíclicas de Trypanosoma cruzi, obtenidas del tracto digestivo de Rhodnius prolixus, sobre alimentos contaminados experimentalmente. Observaciones entre 1h y 18h ... -
Supervivencia e infectividad de formas metacíclicas de Trypanosoma cruzi en alimentos experimentalmente contaminados
(Boletín de malariología y salud ambiental. Vol. XLIX, Nº 1, enero-julio, 2009, 2009-07)Se registra el tiempo de supervivencia de formas metacíclicas de Trypanosoma cruzi, obtenidas del tracto digestivo de Rhodnius prolixus, sobre alimentos contaminados experimentalmente. Observaciones entre 1h y 18h ... -
Swelling studies and adsorption of safranin T by acrylamide/maleic acid/methylene-bis-acrylamide based hydrogels
(2014-07-16)Swelling studies of an acrylamide/maleic acid/methylene-bis-acrylamide-based hydrogel prepared by free radical polymerization (weight ratio of 90/10/3) are presented. Water penetration mechanism was studied by using two ... -
Symmetries of distributional domain wall geometries
(SABER ULA, 2005-05-25)Symmetries of distributional domain wall geometries Pantoja, Nelson; Sanoja, Alberto Abstract Generalizing the Lie derivative of smooth tensor fields to distribution-valued tensors, we ... -
Symmetry nonrestoration at high temperature and the monopole problem
(SABER ULA, 2005-01-06)Symmetry nonrestoration at high temperature and the monopole problem (Melfo, Alejandra; Dvali, Gia; Senjanovic, Goran) Abstract We investigate the high temperature behavior of SU(5) in its minimal version. We show ... -
Synchronization and collective behavior in globally coupled logarithmic maps
(SABER ULA, 2005-01-06)Synchronization and collective behavior in globally coupled logarithmic maps (Cosenza, Mario; González, J.) Abstract The phenomena of synchronization and nontrivial collective behavior in a system of globally coupled ... -
Synthesis and characterization of trans-Mo(CO)4(p-C5NH4SO3Na)2
(Akadémiai Kiadó, Budapest and Springer, Dordrecht, 2008-03-12)Reaction between Mo(CO)6 and p-C5NH4SO3Na (1:2 (Mo: p-C5NH4SO3Na) stoichiometric ratio) gave the trans-Mo(CO)4(p-C5NH4SO3Na)2 complex, (1), in 80% yield. Complex (1) has been characterized by FTIR, 1H and 13C NMR spectroscopy. ... -
Synthesis of light alkenes on manganese promoted.
(SABER ULA, 2007-04-27)Synthesis of light alkenes on manganese promoted. (González Cortés, Sergio Luis; Rodulfo Baechler, Serbia M. A.; Oliveros Bastidas, Alberto; Orozco, José; Fontal, Bernardo; Mora, Asiloé J.; Delgado, Gerzon) Abstract The ... -
Synthesis, characterization and hydroformylation catalytic activity of a water-soluble RhCl(CO)(PySO3Na)2 complex using 1-hexene and real naphtha
(2012-03-16)In this work, we describe the synthesis and characterization of a new water soluble [RhCl(CO)(PySO3Na)2], complex (1); where [PySO3Na] is the sodium salt of p-sulfonated pyridine ligand. Complex (1) was obtained in methanol, ... -
Synthesis, characterization and olefin hydroformylation reactions of mer-[Mo(CO)3(p-C5H4N-CN)3]
(Springer Science+Business Media B.V. 2010, 2010-01-12)Mer-[Mo(CO)3(p-C5H4N-CN)3] was prepared by UV-irradiation of a THF solution of Mo(CO)6 and paracyanopyridine under heating. The complex was characterized by FT-IR, MS, 1H and 13C NMR and showed catalytic activity for olefin ... -
Synthesis, characterization, and biphasic ionic liquid media 1-hexene hydrogenation reaction of RuCl2(DMSO)2(NC5H4CO2Na-3)2
(Publicado en Science+Business Media B.V., 2011-06)RuCl2(DMSO)2(NC5H4CO2Na-3)2 is very soluble in the ionic liquid (IL) 1-n-butyl-3-methylimidazolium tetrafluoroborate, [(BMIM)BF4]. The complex was prepared by reacting RuCl2(DMSO)4 with NC5H4CO2Na-3, sodium nicotinate, in ... -
Synthesis, thermal analysis and structural characterization of the ternary compound Ag2SnTe3
(SaberULA, Venezuela, 2019-05-29)The ternary compound Ag2 SnTe3 has been synthesized and investigated by means of X-ray powder diffraction and its structure has been refined by the Rietveld method. The thermal differential analysis indicates a melting ...