Ship-in-a-bottle synthesis of 2,4,6-triphenylthiapyrylium cations encapsulated in zeolites Y and beta: a novel robust photocatalyst

The 2,4,6-triphenylthiapyrylium ion has been obtained imprisoned inside the supercages of the tridirectional, large pore zeolites Y and beta via ship-in-a-bottle synthesis from chalcone and acetophenone in the presence of hydrogen sulfide. The resulting solids are efficient and robust photocatalysts that are able to degrade phenol and aniline in water with a higher efficiency than the P-25 TiO2 standard. Preliminary tests have shown that these encapsulated dye materials are also efficient photocatalysts for the oxidative degradation of malodorous sulfurcontaining molecules.

Propionylation of anisole to 4-methoxypropiophenone over zeolite H-beta

The results of a detailed study of the propionylation of anisole over various medium and large pore zeolites such as H-ZSM-5, H-beta, H-Na-beta. H-mordenite. H-Y and H-RE- Y are presented and discussed. In addition, homogenous catalysts and amorphous Si02-Al2O3 are also included for comparison, The catalyst and process parameters are optimised to enhance the conversion of propionyl chloride(PC) and selectivity to 4-methoxypropiophenone(4-MOPP).

On Finite Mixture of Pareto and Beta Distnbutions

Department of Statistics, Cochin University of Science and Technology

Extracellular beta-Glucosidase production by marine Aspergillus sydowii BTMFS 55

The beta-glucosidase enzyme purified from the marine fungus, Aspergillus sydowii BTMFS 55 showed a good yield of enzyme production under solid state fermentation. The statistical optimization of the media components revealed that moisture content, concentration of peptone and inoculum are the major parameters which supported the maximal enzyme production. The purified enzyme showed low pH activity and stability, glucose tolerance and activation by ethanol. It could produce ethanol from wheat bran and rice straw by simultaneous saccharification and fermentation with yeast.The glucosidase purified from Aspergillus sydowii BTMFS 55 shows great potential for several biotechnological applications such as the production of bio-ethanol from agricultural biomass and improvement in the aromatic character of wines and fruit juices through the hydrolysis of flavour glucosidic precursors. There is immense scope for the application of this marine fungus in the biofuel production besides in other industries provided further studies are pursued in exploiting this enzyme and the organism particularly scale up studies with respect to application. There is also ample scope for cloning of the gene encoding beta-glucosidase in domesticated hosts such as Pichia pastoris or S. cerevisiae that can produce ethanol directly from cellulosic biomass.

Measurement and simulation of anisotropy in the Infrared and Raman spectra of beta-FeSi2 single crystals

In this paper we show that the orthorhombic phase of FeSi2 (stable at room temperature) displays a sizable anisotropy in the infrared spectra, with minor effects in the Raman data too. This fact is not trivial at all, since the crystal structure corresponds to a moderate distortion of the fluorite symmetry. Our analysis is carried out on small single crystals grown by flux transport, through polarization-resolved far-infrared reflectivity and Raman measurements. Their interpretation has been obtained by means of the simulated spectra with tight-binding molecular dynamics.

X-ray diffraction, thermal analysis, and Raman scattering study of K2BeF4 and comparation to other member of the (beta)-K2SO4 family with ferroelectric -paraelectric transition

Thermal analysis, powder diffraction, and Raman scattering as a function of the temperature were carried out on K2BeF4. Moreover, the crystal structure was determined at 293 K from powder diffraction. The compound shows a transition from Pna21 to Pnam space group at 921 K with a transition enthalpy of 5 kJ/mol. The transition is assumed to be first order because the compound shows metastability. Structurally and spectroscopically the transition is similar to those observed in (NH4)2SO4, which suggests that the low-temperature phase is ferroelectric. In order to confirm it, the spontaneous polarization has been computed using an ionic model.

Análisis de polimorfismos genéticos del receptor beta-2 adrenérgico en pacientes pediátricos asmáticos y controles sanos en una muestra de la ciudad de Bogotá

El asma bronquial es una enfermedad inflamatoria crónica, se asocia a hiperrespuesta de la vía aérea, la cual lleva a episodios recurrentes de sibilancias, tos y disnea. La entidad se ha correlacionado con una gran variedad de genes involucrados en su fisiopatología, dentro de los cuales se encuentran genes localizados en el cromosoma 5 (5q23-31), como el del Receptor ß2 Adrenérgico (RB2A). En el presente trabajo se realizó una estimación de las frecuencias de los polimorfismos Arg16Gly, Gln27Glu y Thr164Ile de este receptor, y se estudió la relación existente entre los diferentes polimorfismos y asma, así como su relación con respecto a la severidad de la enfermedad, finalmente se estimó la relación de los haplotipos conformados por estos tres polimorfismos y su asociación con la enfermedad y severidad del fenotipo asmático.

Análisis de polimorfismos del receptor Beta 2 adrenérgico en pacientes colombianos afectados por fibrosis quística

El gen ADRB2 y sus polimorfismos se han asociado al cuadro clínico de los pacientes con Fibrosis Quística. En nuestra población existe asociación de los haplotipos G16E27I164 y R16Q27I164 y la enfermedad, así como la presencia de Pólipos y genotipo E27E y el haplotipo R16E27T164.

Questionmark Perception v5 Beta Program

Powerpoint for Questionmark Perception v5 Beta Program *University Confidential*

Metodologías alfa-mertonianas y beta-childianas en sociología del conocimiento y de la ciencia : un apunte para el siglo XXI.

Resumen del autor