Hipermetropía

A medida que la información sobre sequías incide en las expectativas de disponibilidad, afectan la disposición de optimizar agua. El resultado sería un ahorro intermitente de agua ya que la información sobre sequías puede ser contrarrestada con información relativa a la desalinización del agua en los océanos o su extracción intensiva en acuíferos fósiles.La escasez y el desabasto de agua son problemáticas globales y locales cuyos efectos en la cognición; creencias, percepciones, conocimientos, actitudes, motivaciones e intensión han sido objeto de estudio de la psicología.Universidad Autónoma del Estado de México - Unidad Académica Profesional Chimalhuacá

Development of a new method for D-xylose detection and quantification in urine, based on the use of recombinant xylose dehydrogenase from Caulobacter crescentus.

The gene xylB from Caulobacter crescentus has been cloned and expressed in Escherichia coli providing a high yield of xylose dehydrogenase (XylB) production and excellent purity (97%). Purified recombinant XylB showed an absolute dependence on the cofactor NAD+ and a strong preference for d-xylose against other assayed mono and disaccharides. Additionally, XylB showed strong stability when stored as freeze-dried powder at least 250 days both at 4 °C and room temperature. In addition, more than 80% of the initial activity of rehydrated freeze-dried enzyme remained after 150 days of incubation at 4 °C. Based on these characteristics, the capability of XylB in d-xylose detection and quantification was studied. The linearity of the method was maintained up to concentrations of d-xylose of 10 mg/dL and the calculated limits of detection (LoD) and quantification (LoQ) of xylose in buffer were 0.568 mg/dL and 1.89 mg/dL respectively. Thus, enzymatic detection was found to be an excellent method for quantification of d-xylose in both buffer and urine samples. This method can easily be incorporated in a new test for the diagnosis of hypolactasia through the measurement of intestinal lactase activity.This work was supported by a grant from Venter Pharma SL (Spain) and partially supported by the Spanish Ministerio de Economía y Competitividad (Grant MAT2015-65184-C2-2-R, MINECO/FEDER).Peer reviewe

Computational Study of the Phosphoryl Donor Activity of Dihydroxyacetone Kinase from ATP to Inorganic Polyphosphate

Adenosine triphosphate (ATP) is the main biological phosphoryl donor required in many enzymes including dihydroxyacetone kinases (DHAKs) that convert dihydroxyacetone (Dha) into dihydroxyacetone phosphate (Dha-P), a key species with potential applications in synthesis. Herein, we present a theoretical study of the molecular mechanism for the phosphoryl transfer reaction from an inorganic polyphosphate to Dha catalyzed by DHAK from C. freundii. This is part of a project devoted to modify the phosphoryl donor specificity of this enzyme avoiding the use of the problematic direct addition of ATP. Based on the use of hybrid QM/MM potentials, with the QM region described by semiempirical and DFT methods, the reaction mechanism of the wild-type enzyme and the most active experimentally measured mutant (Glu526Lys) with poly-P as phosphoryl donor has been explored to elucidate the origin of the activity of this mutant. The similar energy barriers obtained in both systems confirm our previous studies on the binding step (Sánchez-Moreno et al., Int. J. Mol. Sci. 2015, 16, 27835) suggesting that this mutation favors a more adequate position of the poly-P in the active site for the following step, the chemical reaction, to take place

Preparation and characterization of a bifunctional aldolase/kinase enzyme. A more efficient biocatalyst for C-C bond formation

“This is the pre-peer reviewed version of the following article: Iturrate, L., Sánchez-Moreno, I., Oroz-Guinea, I., Pérez-Gil, J., García-Junceda, E. (2010) “Preparation and characterization of a bifunctional aldolase/kinase enzyme. A more efficient biocatalyst for C-C bond formation“ Chem. Eur. J., 16, 4018-4030, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/chem.200903096/abstract”A bifunctional aldolase/kinase enzyme named DLF has been constructed by gene fusion through overlap extension. This fusion enzyme consists of monomeric fructose-1,6-bisphosphate aldolase (FBPA) from Staphylococcus carnosus and the homodimeric dihydroxyacetone kinase (DHAK) from Citrobacter freundii CECT 4626 with an intervening five amino acid linker. The fusion protein was expressed soluble and retained both kinase and aldolase activities. The secondary structure of the bifuctional enzyme has been analysed by CD spectroscopy, as well as that of the parental enzymes, in order to study the effect of the covalent coupling of the two parent proteins on the structure of the fused enzyme. Since S. carnosus FBPA is a thermostable protein, the effect of the fusion on the thermal stability of the bifunctional enzyme has also been studied. The proximity of the active centres in the fused enzyme promotes a kinetic advantage as the 20-fold increment in the initial velocity of the overall aldol reaction indicates. Experimental evidence supports that this increase in the reaction rate can be explained in terms of substrate channellingWe thank the Spanish Ministerio de Ciencia e Innovación for financial support (Grant CTQ2007-67403/BQU). J. P.-G. has been supported by grants BIO2009-09694 and CSD2007-00010. L. Iturrate and I. Sánchez-Moreno acknowledges the Predoctoral Fellowship from Comunidad de Madrid. I. Oroz-Guinea is a JAEPredoc fellow from CSIC. We thank E. G. Doyagüez for her assistance on NMR characterization

Fibromialgia en Trabajo: explorando su Impacto en el Desempeño Laboral

Esta investigación cualitativa exploratoria pretende examinar la experiencia de la fibromialgia en el ámbito laboral y cómo la misma incide en el desempeño de las personas. Utilizamos el Modelo de Demandas y Recursos Laborales para entender cómo los recursos (laborales y personales) y las demandas afectan la efectividad en el trabajo de las personas con fibromialgia. Siete pacientes con fibromialgia residentes en Puerto Rico participaron en entrevistas semiestructuradas. Los resultados apuntan que la fibromialgia tiene un efecto negativo en el desempeño de tareas, principalmente si estas requieren de esfuerzo físico o continuidad en una misma postura por largos periodos. Además, el ambiente laboral incide en la sintomatología y está a su vez en el desempeño de las funciones. Por último, se presentan una serie de recomendaciones enmarcadas en la flexibilidad, recursos personales y la educación, las cuales buscan minimizar los efectos que tiene la fibromialgia en el trabajo

Angiosarcoma primario cardíaco

Cardiac primary angiosarcoma is an uncommon malignant primary tumor of mesenchymal origin with very poor prognosis because it tends to infiltrate the heart and invades the surrounding structures. The diagnosis is made by cardiac imaging; transthoracic echocardiogram and transesophageal echocardiogram provide information about extension, implantation site, size and hemodynamic parameters related to the presence of the mass. Evaluation of the mass can include cardiac magnetic resonance and computerized cardiac tomography.El angiosarcoma cardíaco es un tumor primario maligno infrecuente de origen mesenquimal con muy mal pronóstico, que tiende a infiltrar el corazón e invadir las estructuras circundantes. El diagnóstico inicial se realiza habitualmente con ecocardiografía transtorácica y transesofágica, que aportan mucha información como, por ejemplo, extensión, sitio de implantación, tamaño y parámetros hemodinámicos relacionados con la presencia de la masa. El estudio se puede complementar con otras técnicas como la resonancia magnética cardíaca y la tomografía computarizada cardíaca

Biocatalytic Aldol Addition of Simple Aliphatic Nucleophiles to Hydroxyaldehydes

This ACS article is provided to You under the terms of this Standard ACS AuthorChoice/Editors' Choice usage agreement between You and the American Chemical Society ("ACS")(https://pubs.acs.org/page/policy/authorchoice_termsofuse.html)Asymmetric aldol addition of simple aldehydes and ketones to electrophiles is a cornerstone reaction for the synthesis of unusual sugars and chiral building blocks. We investigated -fructose-6-phosphate aldolase from E. coli (FSA) D6X variants as catalysts for the aldol additions of ethanal and nonfunctionalized linear and cyclic aliphatic ketones as nucleophiles to nonphosphorylated hydroxyaldehydes. Thus, addition of propanone, cyclobutanone, cyclopentanone, or ethanal to 3-hydroxypropanal or (S)- or (R)-3-hydroxybutanal catalyzed by FSA D6H and D6Q variants furnished rare deoxysugars in 8-77% isolated yields with high stereoselectivity (97:3 dr and >95% ee)

Changes in malaria epidemiology in a rural area of Cubal, Angola

Scarce information about malaria epidemiology in Angola has been published. The objective of this study is to describe the epidemiology of malaria at the Hospital Nossa Senhora da Paz (Cubal, Angola) and the fatality rate due to malaria (total and in children under five years) in the last five years. A retrospective, observational study was performed at the Hospital Nossa Senhora da Paz, a 400-bed rural hospital located in Benguela Province of Angola. The study population included all patients who attended the hospital from January 2009 to December 2013. Outcome variables were calculated as follows: the percentage of malaria cases (number of positive thick blood films, divided by the total thick blood films performed); the percentage of in-patients for malaria (number of in-patients diagnosed with malaria, divided by the total number of in-patients); and, the fatality rate (number of deaths due to malaria divided by the number of positive thick blood films). Overall, 23,106 thick blood films were performed, of which 3,279 (14.2%) were positive for Plasmodium falciparum infection. During this five-year period, a reduction of 40% (95% CI 37-43%, p < 0.001) in the malaria-positive slides was detected. Distribution of positive-malaria slides showed a seasonal distribution with a peak from December to March (rainy season). An average annual reduction of 52% (95% CI 50-54%, p < 0.001) in the admissions due to malaria was observed. The overall fatality rate due to malaria was 8.3%, and no significant differences in the annual fatality rate were found (p = 0.553). A reduction in the number of malaria cases and the number of admissions due to malaria has been observed at the Hospital Nossa Senhora da Paz, during the last five years, and incidence along the study period showed a seasonal distribution. All this information could be useful when deciding which malaria control strategies have to be implemented in this area

Tecnologías de la comunicación para la divulgación científica y la mejora docente

El empleo de redes sociales se ha convertido en los últimos años en una actividad cotidiana para la gran mayoría de jóvenes y, por ende, para los universitarios. Muchos docentes e instituciones están incorporado las redes sociales a sus estrategias de enseñanza y difusión de contenidos al tratarse de un espacio idóneo para intercambiar información y el conocimiento de una forma rápida, sencilla y cómoda. Este trabajo presenta el proyecto docente llevado a cabo en el Grado de Lingüística y Lenguas Aplicadas de la Universidad de Cádiz durante el curso 2017‐2018 con la finalidad de mejorar el conocimiento, expectativas y motivación del alumnado mediante el uso de nuevos medios de comunicación social: twitter, Facebook, Instagram, youtube y mailing lists