Browsing Articulos, Pre-prints (Facultad de Ciencias) by Title
Now showing items 468-487 of 488
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Valoración comparativa de pruebas serodiagnósticas utilizadas para detectar enfermedad de Chagas en Venezuela
(2011-12-13)Se presenta la valoración comparativa de 8 técnicas de uso común en el despistaje serológico de la enfermedad de Chagas utilizando muestras de pacientes de diversas procedencias del occidente de Venezuela. En el estudio ... -
Variable Eddington Factor and Radiating Slowly Rotating Bodies in General Relativity
(SABER ULA, 2006-01-26)Variable Eddington Factor and Radiating Slowly Rotating Bodies in General Relativity (Núñez, Luis; Aguirre, Felix; Soldovieri, T.) Abstract We present an extension to a previous work to study the collapse of a ... -
Variaciones estacionales del crecimiento y la respiración foliar de algunas plantas leñosas de la Sabana de Trachypogon
(Boletín de la Sociedad Venezolana de Ciencias Naturales 28: 67-82., Venezuela, 1969) -
Variaciones microclimáticas en invernadero: efecto sobre las relaciones hídricas e intercambio de gases en pimentón (Capsicum annuum)
(2005)En este estudio se compararon los efectos de días despejados con altas radiaciones (1700 mmol m-2 s-1) y días nublados (por debajo de 1000 µmol m-2 s-1) sobre el microclima en invernaderos y las relaciones hídricas e ... -
Variational mechanics of dissipative systems.
(SABER ULA, 2006-08-03) -
Vegetation and grazing patterns in Andean environments: A comparison of pastoral systems in punas and páramos
(Spehn, E., Liberman, M., Körner, C. (Eds)., Estados Unidos, 2006-11-11) -
Vegetation structure along the forest - páramo transition belt in the Sierra Nevada de Mérida: implications for understanding treeline dynamics
(SABER ULA, Venezuela, 2009-12-31)El límite altitudinal del bosque continuo corresponde en los Andes del Norte a una compleja zona de transición entre el bosque paramero y el páramo, y es considerado un ambiente clave para el monitoreo de los efectos ... -
Veinte años de utopía
(SABER ULA, 2008-07-15) -
El viaducto 1 y la nueva ciencia
(2010-01-04) -
Virtual atomic and molecular data centre
(Venezuela, 2009-02-09)A large-scale computational project has been recently launched to develop the Virtual Atomic and Molecular Data Centre (VAMDC). It involves several research groups from the European Union (Austria, France, Germany, Italy, ... -
Viscosimetric studies of chitosan nitrate and chitosan chlorhydrate in acid free NaCl aqueous solution.
(SABER ULA, 2008-03-26)Viscosimetric studies of chitosan nitrate and chitosan chlorhydrate in acid free NaCl aqueous solution. Abstract Two salts of the biopolymer chitosan were prepared in aqueous medium by employing an excess of HCl or HNO3 ... -
Visibilidad a través del web de las instituciones académicas venezolanas.
(SABER ULA, 2007-03-09) -
Water cherenkov detectors response to a Gamma Ray Burst in the large aperture GRB observatory
(http://arxiv.org/, Polonia, 2009-06-04)In order to characterise the behaviour of Water Cherenkov Detectors (WCD) under a sudden increase of 1 GeV - 1 TeV background photons from a Gamma Ray Burst (GRB), simulations were conducted and compared to data acquired ... -
Water relations and gas exchange in Coespeletia moritziana (Sch. Bip) Cuatrec., a giant rosette species of the high tropical Andes
(Photosynthetica 50: 429-436, Venezuela, 2012-04-26)Giant rosettes are ones of the most striking features of the vegetation in the high tropical Andes, with Coespeletia moritziana reaching the highest altitudes up to 4,600 m a.s.l. Different from other giant rosettes, this ... -
X - ray crystal structure of trans-dichloro (hexaphenyl -1, 4,7, 10- tetraphosphadecane) ruthhenium (II)
(SABER ULA, 2008-07-14)X - ray crystal structure of trans-dichloro (hexaphenyl -1, 4,7, 10 -tetraphosphadecane) ruthhenium (II). (Rivera, Valentina; Rodulfo de Gil, Eldrys y Fontal, Bernardo) Abstract The synthesis and X- ray crystal structure ... -
X - ray structure of 1, 4-bis (diphenylphosphino) butane
(SABER ULA, 2008-07-14)X - ray structure of 1, 4-bis (diphenylphosphino) butane. (Rivera, Valentina; Gómez Caraballo, Dora María; Rodulfo de Gil, Eldrys y Suárez B., Trino) Abstract C28H28P2, Mr = 426.48, monoclinic, P21/c, a = 6.134 (2), ... -
X - ray structure of desacetoxysolaphyllidine, a steroid alkaloid from solanum hypomalacophyllum bitter: (22R, 23S, 25R) -22, 26- epimino -3β, 23 -dihydroxy- 5α -cholestan- 4 -one- ammonium acetate (1/1), C27 H45 NO3.NH4+.C2H3O2-
(SABER ULA, 2008-07-14)X - ray structure of desacetoxysolaphyllidine, a steroid alkaloid from solanum hypomalacophyllum bitter: (22R, 23S, 25R)-22,26-epimino-3β,23-dihydroxy-5α-cholestan-4-one-ammonium acetate (1/1), C27 H45 NO3.NH4+.C2H3O2- (Gómez ... -
X-ray structure of 6-deoxymikanokryptin, a new guaianolide from vernonia scorpiodes pers: 3-Oxo -1α, 7α, 8β,(H) -guaia-4(5), 11(13)-dien-8, 12-olide
(SABER ULA, 2008-07-14)X-ray structure of 6-deoxymikanokryptin, a new guaianolide from vernonia scorpiodes pers: 3-Oxo -1α, 7α, 8β,(H) -guaia-4(5), 11(13)-dien-8, 12-olide. (Gómez Caraballo, Dora María; Rivera, Valentina; Rodulfo de Gil, Eldrys; ...