Producción de óxido de grafeno directamente desde un blanco de grafito sin catalizador usando láser pulsado

En este trabajo se explica la forma en que fueron sintetizadas y caracterizadas películas delgadas de Óxido de Grafeno (GO por sus siglas en inglés Graphene Oxide), depositadas mediante la técnica de ablación láser. El GO es un material que hace parte de la familia alotrópica del carbono. En la actualidad este material es de gran interés gracias a sus múltiples aplicaciones en campos tales como: la medicina, la electrónica, las energías renovables, entre otros. El interés por buscar nuevas y mejores técnicas de crecimiento de películas con los más diversos fines, ha llamado la atención de la comunidad internacional, lo cual se fundamenta en el proceso de descubrir las mejores condiciones de crecimiento y posibles aplicaciones. En este trabajo se crecieron películas delgadas de óxido de grafeno sin uso de catalizadores metálicos, y se estudió el cambio de las propiedades morfológicas, estructurales, ópticas y composición química de las películas delgadas. Para la síntesis de las películas delgadas se usó un blanco de grafito pirolítico, depositadas sobre sustratos de silicio y vidrio. El blanco de grafito fue ablacionado con dos longitudes de onda: 532 y 1064 usando un láser de neodymium-doped yttrium aluminium garnet (Nd:YAG)

Producción de óxido de grafeno directamente desde un blanco de grafito sin catalizador usando láser pulsado

En este trabajo se explica la forma en que fueron sintetizadas y caracterizadas películas delgadas de Óxido de Grafeno (GO por sus siglas en inglés Graphene Oxide), depositadas mediante la técnica de ablación láser. El GO es un material que hace parte de la familia alotrópica del carbono. En la actualidad este material es de gran interés gracias a sus múltiples aplicaciones en campos tales como: la medicina, la electrónica, las energías renovables, entre otros. El interés por buscar nuevas y mejores técnicas de crecimiento de películas con los más diversos fines, ha llamado la atención de la comunidad internacional, lo cual se fundamenta en el proceso de descubrir las mejores condiciones de crecimiento y posibles aplicaciones. En este trabajo se crecieron películas delgadas de óxido de grafeno sin uso de catalizadores metálicos, y se estudió el cambio de las propiedades morfológicas, estructurales, ópticas y composición química de las películas delgadas. Para la síntesis de las películas delgadas se usó un blanco de grafito pirolítico, depositadas sobre sustratos de silicio y vidrio. El blanco de grafito fue ablacionado con dos longitudes de onda: 532 y 1064 usando un láser de neodymium-doped yttrium aluminium garnet (Nd:YAG)

Graphite Thin Films Production by Laser Ablation.

Graphite thin films on silicon substrate were synthesized by the fundamental and second harmonics of a Nd : YAG pulsed laser, varying the substrate temperature from 200°C to 500°C . The oxygen gas pressure was of 2x10-5 Torr for all thin films grown. The samples were characterized by Raman and UV-Vis spectroscopy. With Raman spectroscopy the vibrational modes D, G and 2D, were identified. A strong dependence of the Absorbance of samples with substrate temperature was observed. The nanostructure of sample grown at 500°C corresponding to graphene oxide. The average thick of thin films was of 65 nm and 40 nm for fundamental and second harmonics respectively

Adaptation to Water and Salt Stresses of Solanum pimpinellifolium and Solanum lycopersicum var. cerasiforme

[EN] Solanum pimpinellifoliumandSolanum lycopersicumvar.cerasiformerepresent a valuable tool for tomato breeding, particularly for tolerance to abiotic stresses. Water stress and salinity are major constraints to tomato's cultivation, and for which limited genetic variability has been reported within the cultivated species. We evaluated four accessions ofS. pimpinellifoliumand four ofS. l.var.cerasiformefor their adaptation to water deficit and salinity. The CO(2)assimilation rate, stomatal conductance, substomatal CO(2)concentration, transpiration rate, and leaf chlorophyll concentration were evaluated, as well as morphological and agronomic traits. The accessions showed a remarkable inter- and intra-species response variability to both stresses. TwoS. pimpinellifoliumaccessions and oneS. l.var.cerasiformeshowed unaltered physiological parameters, thus indicating a good adaptation to water deficit. TwoS. l.var.cerasiformeaccessions showed an interesting performance under salt stress, one of which showing also good adaptation to water stress. In general, both stresses showed a negative impact on leaf size and fruit fresh weight, especially in the big-sized fruits. However, flowering, fruit setting and earliness remained unaltered or even improved when compared to control conditions. Stressed plants yielded fruits with higher degrees Brix. Response to stresses seemed to be linked to origin environmental conditions, notwithstanding, variability was observed among accessions of the same region.This research was funded by the Spanish Ministerio de Economia y Competitividad and the Fondo Europeo de Desarrollo Regional/European Regional Development Fund, grant number AGL2015-71011-R. Authors also thank the G2P-SOL (Linking genetic resources, genomes, and phenotypes of Solanaceous crops) and BRESOV (Breeding for resilient, e fficient, and sustainable organic vegetable production) projects for support. G2P-SOL and BRESOV projects have received funding from the European Union's Horizon 2020 research and innovation program under grant agreements 677379 (G2PSOL), and 774244 (BRESOV). David Alonso is grateful to Universitat Politecnica de Valencia for a predoctoral (PAID-01-16) contract under the Programa de Ayudas de Investigacion y Desarrollo.Martínez-Cuenca, M.; Pereira-Días, L.; Soler Aleixandre, S.; López-Serrano, L.; Alonso-Martín, D.; Calatayud, Á.; Díez, MJ. (2020). Adaptation to Water and Salt Stresses of Solanum pimpinellifolium and Solanum lycopersicum var. cerasiforme. Agronomy. 10(8):1-19. https://doi.org/10.3390/agronomy10081169119108Cramer, G. R., Urano, K., Delrot, S., Pezzotti, M., & Shinozaki, K. (2011). Effects of abiotic stress on plants: a systems biology perspective. BMC Plant Biology, 11(1), 163. doi:10.1186/1471-2229-11-163Niu, G., Rodriguez, D. S., Crosby, K., Leskovar, D., & Jifon, J. (2010). Rapid Screening for Relative Salt Tolerance among Chile Pepper Genotypes. HortScience, 45(8), 1192-1195. doi:10.21273/hortsci.45.8.1192De Pascale, S., Ruggiero, C., Barbieri, G., & Maggio, A. (2003). Physiological Responses of Pepper to Salinity and Drought. Journal of the American Society for Horticultural Science, 128(1), 48-54. doi:10.21273/jashs.128.1.0048Munns, R., & Tester, M. (2008). Mechanisms of Salinity Tolerance. Annual Review of Plant Biology, 59(1), 651-681. doi:10.1146/annurev.arplant.59.032607.092911Rao, N. K., Bhatt, R. M., & Sadashiva, A. T. (2000). Tolerance to Water Stress in Tomato Cultivars. Photosynthetica, 38(3), 465-467. doi:10.1023/a:1010902427231Scholberg, J. M. S., & Locascio, S. J. (1999). Growth Response of Snap Bean and Tomato as Affected by Salinity and Irrigation Method. HortScience, 34(2), 259-264. doi:10.21273/hortsci.34.2.259Singh, J., Sastry, E. V. D., & Singh, V. (2011). Effect of salinity on tomato (Lycopersicon esculentum Mill.) during seed germination stage. Physiology and Molecular Biology of Plants, 18(1), 45-50. doi:10.1007/s12298-011-0097-zFoolad, M. R. (2004). Recent Advances in Genetics of Salt Tolerance in Tomato. Plant Cell, Tissue and Organ Culture, 76(2), 101-119. doi:10.1023/b:ticu.0000007308.47608.88Albaladejo, I., Meco, V., Plasencia, F., Flores, F. B., Bolarin, M. C., & Egea, I. (2017). Unravelling the strategies used by the wild tomato species Solanum pennellii to confront salt stress: From leaf anatomical adaptations to molecular responses. Environmental and Experimental Botany, 135, 1-12. doi:10.1016/j.envexpbot.2016.12.003Egea, I., Albaladejo, I., Meco, V., Morales, B., Sevilla, A., Bolarin, M. C., & Flores, F. B. (2018). 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A., & Asins, M. J. (2008). Identification of fruit yield loci controlling the salt tolerance conferred by solanum rootstocks. Theoretical and Applied Genetics, 118(2), 305-312. doi:10.1007/s00122-008-0900-6Rao, E. S., Kadirvel, P., Symonds, R. C., & Ebert, A. W. (2012). Relationship between survival and yield related traits in Solanum pimpinellifolium under salt stress. Euphytica, 190(2), 215-228. doi:10.1007/s10681-012-0801-2Rao, E. S., Kadirvel, P., Symonds, R. C., Geethanjali, S., Thontadarya, R. N., & Ebert, A. W. (2015). Variations in DREB1A and VP1.1 Genes Show Association with Salt Tolerance Traits in Wild Tomato (Solanum pimpinellifolium). PLOS ONE, 10(7), e0132535. doi:10.1371/journal.pone.0132535Razali, R., Bougouffa, S., Morton, M. J. L., Lightfoot, D. J., Alam, I., Essack, M., … Negrão, S. (2018). The Genome Sequence of the Wild Tomato Solanum pimpinellifolium Provides Insights Into Salinity Tolerance. Frontiers in Plant Science, 9. doi:10.3389/fpls.2018.01402Comparative Transcriptome Analysis of Responses to Water Deficit in Solanum lycopersicum and S. pimpinellifolium Rootshttps://omictools.com/88516daa3ab811e2cd922bd46ae0ade3-datasetWarnock, S. J. (1991). Natural Habitats of Lycopersicon Species. HortScience, 26(5), 466-471. doi:10.21273/hortsci.26.5.466Diouf, I. A., Derivot, L., Bitton, F., Pascual, L., & Causse, M. (2018). Water Deficit and Salinity Stress Reveal Many Specific QTL for Plant Growth and Fruit Quality Traits in Tomato. Frontiers in Plant Science, 9. doi:10.3389/fpls.2018.00279Blanca, J., Montero-Pau, J., Sauvage, C., Bauchet, G., Illa, E., Díez, M. J., … Cañizares, J. (2015). Genomic variation in tomato, from wild ancestors to contemporary breeding accessions. BMC Genomics, 16(1). doi:10.1186/s12864-015-1444-1Blanca, J., Cañizares, J., Cordero, L., Pascual, L., Diez, M. J., & Nuez, F. (2012). Variation Revealed by SNP Genotyping and Morphology Provides Insight into the Origin of the Tomato. PLoS ONE, 7(10), e48198. doi:10.1371/journal.pone.0048198Datos climáticos mundialeshttps://es.climate-data.org/Beck, H. E., Zimmermann, N. E., McVicar, T. R., Vergopolan, N., Berg, A., & Wood, E. F. (2018). Present and future Köppen-Geiger climate classification maps at 1-km resolution. Scientific Data, 5(1). doi:10.1038/sdata.2018.214Bolarín, M. C., Pérez-Alfocea, F., Cano, E. A., Estañ, M. T., & Caro, M. (1993). Growth, Fruit Yield, and Ion Concentration in Tomato Genotypes after Pre- and Post-emergence Salt Treatments. Journal of the American Society for Horticultural Science, 118(5), 655-660. doi:10.21273/jashs.118.5.655Cantore, V., Lechkar, O., Karabulut, E., Sellami, M. H., Albrizio, R., Boari, F., … Todorovic, M. (2016). Combined effect of deficit irrigation and strobilurin application on yield, fruit quality and water use efficiency of «cherry» tomato (Solanum lycopersicum L.). Agricultural Water Management, 167, 53-61. doi:10.1016/j.agwat.2015.12.024López-Serrano, L., Penella, C., San-Bautista, A., López-Galarza, S., & Calatayud, A. (2017). Physiological changes of pepper accessions in response to salinity and water stress. Spanish Journal of Agricultural Research, 15(3), e0804. doi:10.5424/sjar/2017153-11147Chaves, M. M. (2004). Mechanisms underlying plant resilience to water deficits: prospects for water-saving agriculture. Journal of Experimental Botany, 55(407), 2365-2384. doi:10.1093/jxb/erh269Flexas, J., Bota, J., Loreto, F., Cornic, G., & Sharkey, T. D. (2004). Diffusive and Metabolic Limitations to Photosynthesis under Drought and Salinity in C 3 Plants. Plant Biology, 6(3), 269-279. doi:10.1055/s-2004-820867LAWLOR, D. W. (2002). Limitation to Photosynthesis in Water-stressed Leaves: Stomata vs. Metabolism and the Role of ATP. Annals of Botany, 89(7), 871-885. doi:10.1093/aob/mcf110Flexas, J., Bota, J., Escalona, J. M., Sampol, B., & Medrano, H. (2002). Effects of drought on photosynthesis in grapevines under field conditions: an evaluation of stomatal and mesophyll limitations. Functional Plant Biology, 29(4), 461. doi:10.1071/pp01119Nuruddin, M. M., Madramootoo, C. A., & Dodds, G. T. (2003). Effects of Water Stress at Different Growth Stages on Greenhouse Tomato Yield and Quality. HortScience, 38(7), 1389-1393. doi:10.21273/hortsci.38.7.1389Yin, Y.-G., Kobayashi, Y., Sanuki, A., Kondo, S., Fukuda, N., Ezura, H., … Matsukura, C. (2009). Salinity induces carbohydrate accumulation and sugar-regulated starch biosynthetic genes in tomato (Solanum lycopersicum L. cv. ‘Micro-Tom’) fruits in an ABA- and osmotic stress-independent manner. Journal of Experimental Botany, 61(2), 563-574. doi:10.1093/jxb/erp333Albert, E., Segura, V., Gricourt, J., Bonnefoi, J., Derivot, L., & Causse, M. (2016). Association mapping reveals the genetic architecture of tomato response to water deficit: focus on major fruit quality traits. Journal of Experimental Botany, 67(22), 6413-6430. doi:10.1093/jxb/erw411Ripoll, J., Urban, L., Brunel, B., & Bertin, N. (2016). Water deficit effects on tomato quality depend on fruit developmental stage and genotype. Journal of Plant Physiology, 190, 26-35. doi:10.1016/j.jplph.2015.10.006Nakazato, T., Bogonovich, M., & Moyle, L. C. (2008). ENVIRONMENTAL FACTORS PREDICT ADAPTIVE PHENOTYPIC DIFFERENTIATION WITHIN AND BETWEEN TWO WILD ANDEAN TOMATOES. Evolution, 62(4), 774-792. doi:10.1111/j.1558-5646.2008.00332.xChaves, M. M., Flexas, J., & Pinheiro, C. (2008). Photosynthesis under drought and salt stress: regulation mechanisms from whole plant to cell. Annals of Botany, 103(4), 551-560. doi:10.1093/aob/mcn125Massaretto, I. L., Albaladejo, I., Purgatto, E., Flores, F. B., Plasencia, F., Egea-Fernández, J. M., … Egea, I. (2018). Recovering Tomato Landraces to Simultaneously Improve Fruit Yield and Nutritional Quality Against Salt Stress. 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How Poor Workstation Design Causes Musculoskeletal Disorders: Research from QOC Matrix the Workers’ Voice

An ergonomic intervention method based on QOC Matrix the workers’ voice was implemented in a study case. The diagnosis and analysis developed are used in improvement proposals for workstation redesign. The workers’ voice resulting from reports of the employee’ complaints and symptomatology was the base for a standardized method that comprises: (a) QOC questionnaire application, (b) risk factor categorization, (c) determination of unsafe and unhealthy ergonomic metrics, (d) figuring out the task content impact in the workers’ body, and (e) work system diagnosis. Since workers’ voice, the risk identification made included: (1) the task content linked to work method: repetitiveness associated with the sensor activation using the fingers and the repetitive movements include twist and the stretch of wrist, (2) workplace design regarding container height and injuries caused in wrists and elbows due to hits, (3) task developed regarding risk time exposition and workers position, and (4) workplace design regards to housing collector distance from filling area linked to workers position adopted for reach bags. Improvements included redesign of the workstation with a system of 90° exit discharge curve, one elevation system, and a photoelectric sensor in filling nozzle for automatic filling. As an improvement result, the activity called bags provision was eliminated from the task

Echinocandin susceptibility testing of Candida spp. using the EUCAST EDef 7.1 and CLSI M27-A3 standard procedures: Analysis of the influence of Bovine Serum Albumin Supplementation, Storage Time and Drug Lots

The MICs of echinocandins against Candida isolates with fks mutations are higher than those for wild-type (WT) isolates. However, the MIC ranges for susceptible and mutant populations overlap or are poorly separated. It was recently reported that a greater separation could be achieved in the presence of serum. To more fully explore this possibility, we compared the performances of the reference microdilution methods by using standard and bovine serum albumin (BSA)-supplemented growth medium. Anidulafungin, caspofungin, and micafungin MICs were determined according to EUCAST and CLSI methods and with 50% BSA in the medium for 93 clinical isolates, including Candida albicans (20/10 [number of isolates/number of mutants]), C. glabrata (19/10), C. dubliniensis (2/1), C. krusei (16/3), C. parapsilosis (19), and C. tropicalis (19/4) isolates. Stability of the plates was tested after storage at -80°C for 2 and 6 months, and the performance of two different lots of caspofungin was investigated. The addition of BSA to the medium resulted in higher MICs (1 to 9 2-fold dilution steps) for all isolates and compounds. The increases were greatest for anidulafungin and micafungin and, among WT isolates, for C. parapsilosis. The number of very major errors (VMEs) was reduced (24% [20/84 isolates] versus ≤ 7% [6/84 isolates]) using BSA-supplemented EUCAST medium but not using BSA-supplemented CLSI medium (6% versus 9%). MIC results were unchanged after 6 months of storage of test plates. The two lots of caspofungin yielded identical results. Addition of BSA to the EUCAST medium increases the ability to differentiate between WT isolates and isolates harboring resistance mutations.Fil: Arendrup, Maiken Cavling. Statens Serum Institut. Unit of Mycology and Parasitology; DinamarcaFil: Rodriguez Tudela, Juan Luis. Instituto de Salud Carlos III. Centro Nacional de Microbiología. Servicio de Micología; EspañaFil: Park, Steven. UMDNJ-New Jersey Medical School. Public Health Research Institute; Estados UnidosFil: Garcia, Guillermo Manuel. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. UMDNJ-New Jersey Medical School. Public Health Research Institute; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe; ArgentinaFil: Delmas, Guillaume. UMDNJ-New Jersey Medical School. Public Health Research Institute; Estados UnidosFil: Cuenca Estrella, Manuel. Instituto de Salud Carlos III. Centro Nacional de Microbiología. Servicio de Micología; EspañaFil: Gómez López, Alicia. Instituto de Salud Carlos III. Centro Nacional de Microbiología. Servicio de Micología; EspañaFil: Perlin, David Scott. UMDNJ-New Jersey Medical School. Public Health Research Institute; Estados Unido

Graphite Thin Films Production by Laser Ablation.

Graphite thin films on silicon substrate were synthesized by the fundamental and second harmonics of a Nd : YAG pulsed laser, varying the substrate temperature from 200°C to 500°C . The oxygen gas pressure was of 2x10-5 Torr for all thin films grown. The samples were characterized by Raman and UV-Vis spectroscopy. With Raman spectroscopy the vibrational modes D, G and 2D, were identified. A strong dependence of the Absorbance of samples with substrate temperature was observed. The nanostructure of sample grown at 500°C corresponding to graphene oxide. The average thick of thin films was of 65 nm and 40 nm for fundamental and second harmonics respectively

Stratigraphic correlation through vertical, directional and horizontal wells, of the geological formations of the canton La Joya de los Sachas, Orellana - Ecuador

Este trabajo investigativo comprende principalmente de 3 fases. La primera en la que se basa en el análisis de Reportes de Perforación y Mud Loggin de pozos petroleros de los tipos verticales, direccionales y horizontales, que se perforaron en el cantón la joya de los Sachas ubicado en la provincia de Orellana - Ecuador. En segunda instancia, se ha elaborado una correlación estratigráfica de las principales formaciones del subsuelo de este cantón. La que se basa en un análisis manual del historial de los pozos, clasificándolos en unidades estratigráficas previo el ingreso de la información al software GMS® para construir secciones transversales tridimensionales entre perforaciones. Finalmente, se identifica y caracteriza los minerales con algunas de sus propiedades de las formaciones identificadas.  Por lo que se encuentran facies de anhidrita que corresponden al material base para la generación de petróleo, paquetes de arenisca, arcillolita y limonita, correspondientes a la formación Tiyuyacu, siendo intercalada por estratos de conglomerado silíceo, pertenecientes a la Formación Orteguaza. Adicional a esto se observa que la facie de anhidrita forma un pliegue anticlinal cuya cresta es cercana a los menos -160msnm, a su vez, por debajo de los paquetes de arenisca, arcillolita y limonita se muestra una facie de carbón formando un pliegue sinclinal desde los -350msnm.This investigative work mainly comprises 3 phases. The first one is based on the analysis of Drilling Reports and Mud Loggin of oil wells of the vertical, directional and horizontal types, which were drilled in the canton of La Joya de los Sachas located in the province of Orellana - Ecuador. In the second instance, a stratigraphic correlation of the main subsoil formations of this canton has been developed. Which is based on a manual analysis of the history of the wells, classifying them in stratigraphic units prior to entering the information into the GMS® software to build three-dimensional cross sections between holes. Finally, the minerals are identified and characterized with some of their properties from the identified formations. Therefore, there are anhydrite facies that correspond to the base material for the generation of oil, sandstone, claystone and limonite packages, corresponding to the Tiyuyacu formation, being interbedded by siliceous conglomerate strata, belonging to the Orteguaza Formation. In addition to this, it is observed that the anhydrite face forms an anticline fold whose crest is close to minus -160msnm, in turn, below the sandstone, claystone and limonite packages, a coal face is shown forming a synclinal fold from -350msn

Degenerations of Jordan Superalgebras

We describe degenerations of three-dimensional Jordan superalgebras over $\mathbb{C}$. In particular, we describe all irreducible components in the corresponding varieties.Comment: arXiv admin note: text overlap with arXiv:1611.0645

Narración fotográfica y diario multimodal de aprendizaje: enriquecimiento de creencias y valores en la formación inicial de educadores

Depto. de Estudios EducativosFac. de EducaciónFALSEsubmitte