Search results for "SMOS"
showing 10 items of 444 documents
On the nature of the forces controlling selectivity in the high performance capillary electrochromatographic separation of peptides
2003
In this minireview, the nature of the forces controlling selectivity in the high performance capillary electrochromatographic (HP-CEC) separation of peptides has been examined. For uncharged and charged peptides, a synergistic interplay occurs in HP-CEC systems between adsorptive/partitioning events and electrokinetically driven motion. Moreover, at high field strengths, both bulk electrophoretic migration and surface electrodiffusion occur. Thus, the migration behavior of peptides in different HP-CEC systems can be rationalized in terms of the combined consequences of these various processes. Moreover, in HP-CEC, the buffer electrolyte interacts with both the peptide analytes and the sorbe…
Iontophoretic Transdermal Delivery of Sumatriptan: Effect of Current Density and Ionic Strength
2005
ABSTRACT: Iontophoretic transdermal delivery of sumatriptan was investigated in vitro . Among the conditions tested, 0.25 mA/cm 2 and low ionic strength (NaCl 25 mM) was the best experimental condition to increase its transport across the skin. The flux increased 385-fold respective to passive diffusion, thus resulting in a transdermal flux of sumatriptan of 1273 ± 83 nmol/cm 2 h. © 2005 Wiley-Liss, Inc. and the American Pharmacists Association
Nonsense-mediated mRNA decay controls the changes in yeast ribosomal protein pre-mRNAs levels upon osmotic stress.
2013
The expression of ribosomal protein (RP) genes requires a substantial part of cellular transcription, processing and translation resources. Thus, the RP expression must be tightly regulated in response to conditions that compromise cell survival. In Saccharomyces cerevisiae cells, regulation of the RP gene expression at the transcriptional, mature mRNA stability and translational levels during the response to osmotic stress has been reported. Reprogramming global protein synthesis upon osmotic shock includes the movement of ribosomes from RP transcripts to stress-induced mRNAs. Using tiling arrays, we show that osmotic stress yields a drop in the levels of RP pre-mRNAs in S. cerevisiae cell…
Characterization of pressure retarded osmosis lab-scale systems
2016
Power generation from salinity gradient is a viable alternative to produce energy from renewable sources. Pressure Retarded Osmosis (PRO) is one of the technologies proposed so far for the exploitation of such energy source. In the present preliminary work, two different geometry modules were tested under atmospheric pressure (i.e. forward osmosis or depressurized-PRO conditions). The first one is a conventional planar geometry cell. The second is a customized cylindrical membrane module, able to mechanically support the osmotic membrane along with the spacers. The latter, thanks to its design, allows membranes and spacers to be easily changed for testing purposes. A novel simplified proced…
Towards the ultimate minimum particle diameter of silica packings in capillary electrochromatography.
2000
Porous silica beads with an average particle diameter between 0.2 and 3 microm have been applied as packing material in capillary electrochromatography (CEC). The experiments were directed to investigate whether it is really feasible and as promising as expected to use such small particles. In CEC, plate heights of H approximately/= 1-2 d(p) can be achieved which is smaller than the plate heights usually attained in high-performance liquid chromatography. Using a capillary packed with 0.5 microm silica beads we achieved a plate height of H = 3 d(p) indicating the presence of dispersive effects like Joule heating. Calculations demonstrate that at a field strength of about 800 V cm(-1) one th…
Reacciones de formación de enlaces C-C catalizadas por metales de transición y factores que les afectan
2015
La síntesis y funcionalización de compuestos carbonílicos ha atraído la atención de los químicos a lo largo del tiempo ya que el grupo carbonilo es una función muy versátil en química orgánica y está presente en numerosos compuestos con actividad biológica. Por su parte, las reacciones de acoplamiento cruzado de dos y tres componentes son metodologías que actualmente se aplican a nivel tanto académico como industrial debido a que requieren condiciones suaves de reacción, la extracción de los productos de la mezcla de reacción es fácil y los subproductos generados presentan una baja toxicidad. En este contexto, la aplicación de estas metodologías a la síntesis y funcionalización de compuesto…
Aportación al estudio de la escultura románica en Valencia: hallazgo de dos capiteles y una imposta con decoración teriomórfica en la Casa-Museo Benl…
2009
El artículo da noticia del hallazgo en el jardín de la Casa-Museo Benlliure de Valencia de dos capiteles y una imposta románicos que se hallaban expuestos en el antiguo Museo Arqueológico Diocesano de Valencia hasta 1936, probablemente pertenecientes a un ventanal del palacio episcopal medieval de Valencia, construido a partir de 1242. El estudio pormenorizado de las piezas, decoradas con motivos teriomórficos de origen rosellonés, sitúa su origen en un taller gerundense, que en relación con otras obras valencianas coetáneas pone de manifiesto una corriente dentro del románico local no contemplada hasta ahora. (A)
Sobre la afirmación del cinematógrafo como un medio expresivo de la vanguardia parisina
2004
El estudio plantea dos problemas que afectaron al desarrollo del cinematógrafo a inicios del siglo XX, las posibilidades técnicas y estéticas del nuevo medio expresivo y los principios que se manifestaron en dos vertientes, una, narrativa, la otra, plástica. Todo esto, contrastando las opiniones de los intelectuales que se opusieron o apoyaron al nuevo medio con las aportaciones de los principales directores a las tendencias denominadas: Cine de pintura, Cine psicológico, Cine abstracto y Nuevo realismo. (A)
Magnetic resonance imaging in infections of the brain: findings in tuberculosis, listeriosis, toxoplasmosis, subacute sclerosing panencephalitis, and…
1987
A total of 6 patients with various inflammatory brain diseases were investigated by MRI. Typical diagnostic criteria like signal intensity, location, and morphology of the lesions are presented. MRI proves to be a highly sensitive method to detect encephalitic foci, which, however, suffers from a low specificity. Therefore additional informations like case history, clinical findings, and serological data have to be considered to find the correct diagnosis.
2019
Background Congenital Toxoplasmosis (CT) can have severe consequences. France, Austria, and Slovenia have prenatal screening programs whereas some other countries are considering universal screening to reduce congenital transmission and severity of infection in children. The efficiency of such programs is debated increasingly as seroprevalence among pregnant women and incidence of congenital toxoplasmosis show a steady decrease. In addition, uncertainty remains regarding the effectiveness of pre- and postnatal treatments. Method To identify cost-effective strategies, prenatal and neonatal screenings were compared using a decision-analytic model based on French guidelines and current knowled…