Revistas académicas de arte en bases de datos bibliográficas: disponibilidad en acceso abierto y en bibliotecas de tres instituciones mexicanas

Objetivo: Identificar la presencia de las revistas académicas de arte en las principales bases de datos bibliográficas (WoS y Scopus a nivel internacional, así como Latindex, Scielo y Re- dalyc en el ámbito Iberoamericano). Método: Se describe la participación de los títulos vigentes en 2011 por país, idioma y ámbito temático. En el caso de las revistas registradas en el Arts & Humanities Citation Index –a&hci, Thomson Reuters isi– se identificó su tipo de acceso (abierto o por suscrip- ción), así como su disponibilidad en tres bibliotecas de ins- tituciones mexicanas vinculadas a las disciplinas artísticas: la Universidad Nacional Autónoma de México (unam), el Centro Nacional de las Artes (cna) y la Universidad Autó- noma del Estado de México (uaem). Resultados: No se re- gistra ninguna revista latinoamericana de arte en el a&hci, su disponibilidad en acceso abierto es limitada (11.3%), así como también su disponibilidad en las bibliotecas analiza- das, con una variación del 20 al 6% en los casos analizado

Synthesis and Characterization of TiO2 Modified with olystyrene and Poly(3-chloro-2-hydroxypropyl Methacrylate) as Adsorbents for the Solid Phase Extraction of Organophosphorus Pesticides

ARTICULO DE INVESTIGACION EN REVISTA INDEXADANovel hy br i d Ti O2 particles were developed and assessed as an adsorbent for solid phase extraction (SPE) of organophosphorus pesticides (fensulfothion, parathion methyl, coumaphos, and diazinon) from spiked water. Th sol-gel method was used to synthesize TiO2 particles, which were coated with free-radical polystyrene (PS) and poly(3-chloro-2-hydroxypropyl methacrylate) (PClHPMA) polymers. Particle structures were determined via Fourier transform infrared spectroscopy to confim that the polymers were successfully anchored to the TiO2 particles. Thrmogravimetric analysis was conducted to determine organic and inorganic matter in TiO2-PS and TiO2-PClHPMA particles showing results of 20 : 80 wt/wt% and 23 : 77 wt/wt%, respectively. SEMEDS and X-ray diffaction test were conducted to determine the morphology and semielemental composition of the particles showing amorphous characteristics. By observing the contact angle, particles coated with PClHPMA were determined to be more hydrophilic than TiO2-PS particles. Th pore size distributions obtained from the N2 adsorption-desorption isotherms were 0.150 and 0.168 cm3g−1. Th specifi surface area (BET) was 239.9 m2g−1 for TiO2-PS and 225.7 m2g−1 for TiO2-PClHPMA. Th synthesized particles showed relatively high yields of adsorption in SPE. Th pesticide recoveries obtained by high performance liquid chromatography ranged from 6 to 26% for TiO2-PClHPMA and 44 to 92% for TiO2-PS.Consejo Nacional de Ciencia y Tecnología, CONACyT (83390

Preparation of zinc peroxide nanoparticles by laser ablation of solid in liquids

In the last decade, there has been interest on the synthesis and characterization of Zinc peroxide (ZnO2) due to its potential applications as biocide, bactericide, inorganic oxidant and so on. ZnO2 can be obtained as a powder with a cubic structure and has been utilized as a precursor to obtain Zinc oxide (ZnO). ZnO2 can be considered as an oxygen reservoir since when it is heated at relatively low temperatures oxygen is released. Various approaches have been utilized to synthetize ZnO2 powders like sol-gel, organometallic precursors, hydrothermal, Laser Ablation of Solids in Liquids (LASL), and so on. While the hydrothermal route is one of the most utilized methods to obtain ZnO2, the LASL technique has only been utilized by the Gondal´s group to synthesize zinc peroxide nanoparticles. Escobedo et al. have been reported a study of the vibrational properties of ZnO2 NPs synthesized by the hydrothermal method. Additionally, they present results of XRD, TEM and by thermal analysis determine the decomposition temperature of their ZnO2 NPs. Recently, the Escobedo-Morales’s group has reported a green method to prepare ZnO nanostructures employing as starting material ZnO2 (prepared by hydrothermal method

Synthesis of molybdenum oxide nanoparticles by nanosecond laser ablation

Phothermal therapy (PTT) is one of the most promising techniques to treat cancer. Finding the ideal PTT agent nanomaterial has remained a challenge and has brought the interest of several researchers. In this work, we report the synthesis of molybdenum oxide (MoOx) nanoparticles (NPs), which exhibit absorption in the biological optical window ~840 nm, by using the laser ablation of solids in liquids (LASL) technique with nanosecond (ns) pulses. A Nd:YAG laser was used to synthesize the NPs in deionized (DI) water, free of surfactants or additives, which were optically characterized by absorption spectroscopy and TEM-EDX microscopy. Semi spherical NPs with a suitable average size and shape for potential use as PTT agents were obtained by laser ablation and ablation + fragmentation. The calculated band gap is 3.1 eV, which corresponds to MoO3. Micro-Raman spectroscopy studies determined that these NPs are composed of amorphous molybdenum oxide hydrates (MoO3 · xH2O)

Biogenic Silver Nanoparticles as Sensors of Cu2+ and Pb2+ in Aqueous Solutions

Biogenic Silver Nanoparticles as Sensors of Cu2+ and Pb2+ in Aqueous SolutionsSilver nanoparticles (Ag-NPs) were bio-synthesized using Camellia sinensis (green tea) aqueous extract. Nanoparticles prepared with 10-3 M AgNO3 solution, using 3mL of green tea extract and at 60˚C, have spherical shape with a mean diameter of 7nm. The formation of the nanoparticles was confirmed by UV-Vis spectrophotometry through studies of the surface plasmon resonance (SPR). The morphology, size and crystalline structure of the Ag-NPs were determined using high definition transmission electron microscopy (TEM). Moreover, these green synthesized Ag-NPs were found to exhibit good sensing properties towards Cu2+ and Pb2+ ions in aqueous solutions. This metal ions-sensing ability of the biogenic Ag-NPs was monitored by UV-Vis spectrophotometry (SPR analyses) and fluorescence spectroscopy

Influence of pH on properties of ZnS thin films deposited on SiO2 substrate by chemical bath deposition

Artículo Publicado en Revista indexadaThis work focuses on the study of zinc sulfide (ZnS) thin films prepared by chemical bath deposition. The effect of the pH ranging from 10.0 to 10.75 on quality of ZnS thin films on SiO2 substrate is investigated. The effect of pH on the surface showed that the variation of pH has a significant effect on the morphology of the ZnS thin films. The sample with pH value of 10.50 was uniform, free of agglomerates with band gap energy about 3.67 eV. The resistivity of ZnS thin films on SiO2 substrate with different pH value were about 107 Ω cm.DGAPA-PAPIIT IN108613-2 - PROYECTO UNA

Novel tuffite/Fe-Cu oxides nanocomposite with functionality for dye removal in aqueous solution

Fe-Cu oxides nanoparticles were embedded on tuffite (TUF) mineral by means of a simple immersion-ion impregnation, followed by a reduction reaction, methodology. TUF/Fe-Cu nanocomposite characteristics were investigated by XRD, TEM, BET, SEM, FT-IR spectroscopy and pHzpc method. Fe-Cu nanostructures with mean sizes between 10 and 20 nm were effectively supported on TUF. Because of its functional properties, the nanocomposite was studied as adsorbent material for the degradation of Malachite Green (MG) organic dye in aqueous solution. The adsorption kinetic data was well-fitted to pseudo first-order model, indicating physisorption as the main mechanism of adsorption. High pH and temperature of the solution favored malachite green adsorption. The adsorption process was spontaneous and endothermic. In comparative sorption experiments with different dyes, the nanocomposite showed better removal capacities for cationic and basic than for anionic and acid dyes. Langmuir, Freundlich, Langmuir-Freundlich and Temkin models were applied to evaluate the isotherms, resulting in an adsorption capacity of 376.66 mg/g, which is above most of the adsorbent materials so far employed for malachite green degradation in aqueous solution. Therefore, this novel, easy to prepare and low-cost nanocomposite proved to have synergic functionality as an efficient adsorbent material for cationic organic dyes.UAEM/2708/2013 and 3688/2014/CIB projects. Scholar-ship Grant No. 289993CONACYT

Ouabain Enhances Cell-Cell Adhesion Mediated by beta1 Subunits of the Na(+),K(+)-ATPase in CHO Fibroblasts

Adhesion is a crucial characteristic of epithelial cells to form barriers to pathogens and toxic substances from the environment. Epithelial cells attach to each other using intercellular junctions on the lateral membrane, including tight and adherent junctions, as well as the Na(+),K(+)-ATPase. Our group has shown that non-adherent chinese hamster ovary (CHO) cells transfected with the canine beta1 subunit become adhesive, and those homotypic interactions amongst beta1 subunits of the Na(+),K(+)-ATPase occur between neighboring epithelial cells. Ouabain, a cardiotonic steroid, binds to the alpha subunit of the Na(+),K(+)-ATPase, inhibits the pump activity and induces the detachment of epithelial cells when used at concentrations above 300 nM. At nanomolar non-inhibiting concentrations, ouabain affects the adhesive properties of epithelial cells by inducing the expression of cell adhesion molecules through the activation of signaling pathways associated with the alpha subunit. In this study, we investigated whether the adhesion between beta1 subunits was also affected by ouabain. We used CHO fibroblasts stably expressing the beta1 subunit of the Na(+),K(+)-ATPase (CHO beta1), and studied the effect of ouabain on cell adhesion. Aggregation assays showed that ouabain increased the adhesion between CHO beta1 cells. Immunofluorescence and biotinylation assays showed that ouabain (50 nM) increases the expression of the beta1 subunit of the Na(+),K(+)-ATPase at the cell membrane. We also examined the effect of ouabain on the activation of signaling pathways in CHO beta1 cells, and their subsequent effect on cell adhesion. We found that cSrc is activated by ouabain and, therefore, that it likely regulates the adhesive properties of CHO beta1 cells. Collectively, our findings suggest that the beta1 subunit adhesion is modulated by the expression levels of the Na(+),K(+)-ATPase at the plasma membrane, which is regulated by ouabain