Search results for "Argo"
showing 10 items of 424 documents
Imaging pore space in tight gas sandstone reservoir: insights from broad ion beam cross-sectioning
2010
Monetization of tight gas reservoirs, which contain significant gas reserves world-wide, represents a challenge for the entire oil and gas industry. The development of new technologies to enhance tight gas reservoir productivity is strongly dependent on an improved understanding of the rock properties and especially the pore framework. Numerous methods are now available to characterize sandstone cores. However, the pore space characterization at pore scale remains difficult due to the fine pore size and delicate sample preparation, and has thus been mostly indirectly inferred until now. Here we propose a new method of ultra high-resolution petrography combining high resolution SEM and argon…
Rovibrational structure of the Ar–CO complex based on a novel three-dimensional ab initio potential
2002
The first three-dimensional ab initio intermolecular potential energy surface of the Ar–CO van der Waals complex is calculated using the coupled cluster singles and doubles including connected triples model and the augmented correlation-consistent polarized valence quadruple zeta (aug-cc-pVQZ) basis set extended with a (3s3p2d1f1g) set of midbond functions. The three-dimensional surface is averaged over the three lowest vibrational states of CO. Rovibrational energies are calculated up to 50 cm−1 above the ground state, thus enabling comprehensive comparison between theory and available experimental data as well as providing detailed guidance for future spectroscopic investigations of highe…
Tre osservazioni su diez tesis acerca de la coherencia en el Derecho
2021
El artículo está dedicado a tres observaciones críticas sobre la concepción de la coherencia defendida por Amaya. Estas observaciones se refieren a: a) la supuesta incompatibilidad entre la coherencia y la concepción instrumental de la razón práctica; b) la aspiración a la best explanation y, finalmente, c) al vínculo entre la coherencia y la responsabilidad epistémica.
5' tRNA halves are highly expressed in the primate hippocampus and might sequence-specifically regulate gene expression
2020
Fragments of mature tRNAs have long been considered as mere degradation products without physiological function. However, recent reports show that tRNA-derived small RNAs (tsRNAs) play prominent roles in diverse cellular processes across a wide spectrum of species. Contrasting the situation in other small RNA pathways the mechanisms behind these effects appear more diverse, more complex, and are generally less well understood. In addition, surprisingly little is known about the expression profiles of tsRNAs across different tissues and species. Here, we provide an initial overview of tsRNA expression in different species and tissues, revealing very high levels of 5′ tRNA halves (5′ tRHs) pa…
Conflicts over the provision and payment of wages of the "pavordías" of the University of Valencia during the second half of the seventeenth century
2002
Este artículo analiza las causas que influyeron en la dificultad de dotar las pavordías de la Universidad de Valencia en la segunda mitad del seiscientos. Los incrementos salariales de los pavordes, los gastos provocados por los continuos pleitos con los canónigos, la disminución de la renta de la pavordía, la reclamación por la Cámara Apostólica de los quindenios correspondientes y el desacuerdo entre la Ciudad y los pavordes respecto al estado de las cuentas se conjugaron para provocar la paralización de la provisión de preposituras. Situación a la que sólo la firma de las sucesivas concordias de 1669 y 1680 entre la Ciudad y los pavordes consiguió poner fin. This article analyzes the cau…
El presupuesto de la Universidad de Valencia (1598-1611)
1992
EL ANALISIS DEL PRESUPUESTO EN LOS PRIMEROS AÑOS DEL REINADO DE FELIPE III PRESENTA EL ASPECTO FINANCIERO DE LA UNIVERSIDAD QUE PERDURARA HASTA EL SIGLO XVIII, ES DECIR, DOTACION MUNICIPAL Y DE FONDOS DE PAVORDIA. LA PRIMERA SE MOSTRARA, POR LO GENERAL, ESCASA, Y LOS PROFESORES DEBERAN BUSCAR COMPLEMENTAR SUS INGRESOS. LA RENTA DE PAVORDIA SERA MAS SUSTANCIOSA Y PRIVILEGIARA LAS MATERIAS TEOLOGICAS DE ACUERDO CON LOS NUEVOS TIEMPOS DEL BARROCO CUANDO DICHA DISCIPLINA SE CONVIERTE EN COLUMNA VERTEBRAL A LA QUE SE SUBORDINAN LOS DEMAS SABERES CIENTIFICO-TECNICOS. LA DOTACION PRESUPUESTARIA ES, PUES, HASTA CIENTO PUNTO, INDICATIVA DE LA IMPORTANCIA SOCIO-CULTURAL QUE TIENEN LAS DISTINTAS MATER…
The effect of different periods of argon deaeration on exhaled breath condensate pH.
2011
Exhaled breath condensate (EBC) pH has been considered as a biomarker of airway inflammation in asthma. However, little information is available on the duration of argon deaeration required to achieve a stable pH in EBC samples.To identify differences in EBC pH after argon deaeration for 2, 4, and 8 min.EBC pH was determined in EBC samples from 48 subjects with allergic rhinitis (11 asthmatics) and 14 healthy volunteers without deaeration and after argon deaeration for 2, 4, and 8 min.The mean (95% CI) pH values obtained from samples analyzed after 4 min [7.66 (7.52-7.80)] and 8 min [7.70 (7.55-7.85)] of argon deaeration were significantly less acidic (p.001) than those identified after 2 m…
Inducible and reversible inhibition of mirna-mediated gene repression in vivo
2021
Although virtually all gene networks are predicted to be controlled by miRNAs, the contribution of this important layer of gene regulation to tissue homeostasis in adult animals remains unclear. Gain and loss-of-function experiments have provided key insights into the specific function of individual miRNAs, but effective genetic tools to study the functional consequences of global inhibition of miRNA activity in vivo are lacking. Here we report the generation and characterization of a genetically engineered mouse strain in which miRNA-mediated gene repression can be reversibly inhibited without affecting miRNA biogenesis or abundance. We demonstrate the usefulness of this strategy by invest…
Molecular determinants of large cargo transport into the nucleus
2020
Nucleocytoplasmic transport is tightly regulated by the nuclear pore complex (NPC). Among the thousands of molecules that cross the NPC, even very large (>15 nm) cargoes such as pathogens, mRNAs and pre-ribosomes can pass the NPC intact. For these cargoes, there is little quantitative understanding of the requirements for their nuclear import, especially the role of multivalent binding to transport receptors via nuclear localisation sequences (NLSs) and the effect of size on import efficiency. Here, we assayed nuclear import kinetics of 30 large cargo models based on four capsid-like particles in the size range of 17–36 nm, with tuneable numbers of up to 240 NLSs. We show that the requireme…
Determination of ultratrace bismuth in milk samples by atomic fluorescence spectrometry.
2003
Abstract A sensitive procedure was developed for determination of bismuth (Bi) in milk samples by hydride generation atomic fluorescence spectrometry (HG–AFS) after microwave-assisted sample digestion with HNO3 and H2O2. The method provides a sensitivity of 1832 fluorescence units (ng/mL) with a detection limit of 0.01 ng/mL, which corresponds to 20 pg absolute limit of detection, equivalent to 0.50 ng/g in the original sample. Application of the methodology to cow milk samples from the Spanish market showed the presence of Bi at a concentration of 11.8–28.8 ng/g, which compared well with data obtained after dry ashing of samples and with data obtained by inductively coupled plasma–mass spe…