Efecto de la temperatura sobre la transferencia de agua durante la deshidratación osmótica de papa (Solanum tuberosum L.)

El principal objetivo de este trabajo fue estudiar la cinética de deshidratación osmótica de papa (Solanum Tuberosum L.). Se comparó el ajuste de los datos experimentales con el modelo cinético fenomenológico y con el modelo de Azuara. Para ello, en cubos de 1 cm de arista se evaluó el efecto de la temperatura (30 ºC, 40 ºC y 50 ºC) sobre los coeficiente de difusión efectiva del agua y sólidos. Se determinó la pérdida de peso de agua y la ganancia de sólidos. Las mayores pérdidas de agua se obtuvieron a la temperatura de 50 ºC. Se calcularon los parámetros cinéticos ajustándose adecuadamente a los modelos matemá- ticos respectivos para la pérdida de agua y la ganancia de sólidos. Asimismo, se determinó la energía de activación mediante la ecuación de Arrhenius siendo superior la energía de activación para la difusión en la ganancia de sólidos.The main purpose for this work is to study the osmotic dehydration kinetics of potatoes (Solanum Tuberosum L.). Thus, a comparison of fitness for the experimental data related to the phenomenological kinetic model and Azuara’s model was made. When applying to 1 cm size potatoes cubes, effect of temperature (30 ºC, 40 ºC and 50ºC) on effective diffusivity coefficients for both water and solids was measured. Water weight loss and solids increase was determined. The highest water loss occurred at 50 º C. The different models kinetics parameters were calculated and a good fitness to mathematical respective relationships was obtained, both for water loss and solids increments. Furthermore, activation energy when applying Arrhenius equation was calculated, being higher for the diffusivity of solids gain.Fil: Silva Paz, Reynaldo Justino. Universidad Tecnológica Nacional. Facultad Regional Buenos Aires; Argentina. Universidad Nacional de Entre Rios; ArgentinaFil: Della Rocca, Patricia A.. Universidad Tecnológica Nacional. Facultad Regional Buenos Aires; ArgentinaFil: Tisocco, Osvaldo D.. Universidad Nacional de Entre Ríos. Facultad de Ciencias de la Alimentación; ArgentinaFil: Mascheroni, Rodolfo Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Centro de Investigaciones en Criotecnología de Alimentos (i); Argentina. Universidad Nacional de La Plata; Argentin

Ion-exchange resin as a new tool for characterisation of coordination compounds and MOFs by NMR spectroscopy

1H and 13C NMR spectroscopy is used to investigate the organic constituents of metal complexes, MOFs and coordination compounds synthesised under solvothermal and precipitation conditions. The elucidation of the ligands in paramagnetic compounds bearing Cu2+(d9), Gd3+ (f7), Eu3+ (f6), Fe3+(d5), ions after treatment with a cationic exchange resin is possible. We prove the efficiency of two post-synthesis linker modifications on diamagnetic IRMOF-3 Zn2+ (d10) with ethyl isocyanate and benzyl bromide

Ondeleta de Morlet Aplicada à Análise de Correlações por Escala entre Grandezas Escalares Medidas acima de uma Lavoura de Arroz

An analysis has been performed to investigate the Monin-Obukhov Similarity Theory (MOST) validity in the atmospheric surfacelayer (ASL) above a rice field in a homogeneous area in Paraíso do Sul,RS. Statistical calculations have been applied to turbulent fluctuationsprojected on scales by means of the Wavelet Transform (WT). It hasbeen determined on which scales, physical factors such as surfaceroughness or local circulations occurrence, affect meteorological scalarfields (temperature, humidity and CO2 concentrations) measured withfast response devices installed in a tower, under different atmosphericstability and soil use conditions.Foi efetuada uma análise de validade da Teoria da Similaridadede Monin-Obukhov (TSMO) na camada limite superficial (CLS) acimade uma lavoura de arroz em região praticamente homogênea em Paraísodo Sul, RS. Utilizaram-se cálculos estatísticos aplicados às flutuaçõesturbulentas por escala através da decomposição proporcionada pela Transformadaem Ondeletas (TO). Determinou-se em que escalas fatores físicos,como a rugosidade superficial ou ocorrência de circulações locais,afetaram os campos de escalares (temperatura, umidade e concentraçãode CO2) medidos com instrumentos de resposta rápida instalados emtorre, sob diferentes condições de estabilidade atmosférica e coberturado solo

Interaction of chitosan and mucin in a biomembrane model environment

AbstractChitosans have been widely exploited in biological applications, including drug delivery and tissue engineering, especially owing to their mucoadhesive properties, but the molecular-level mechanisms for the chitosan action are not known in detail. It is believed that chitosan could affect the mucus by interacting with the proteins mucins, in a process mediated by the cell membrane. In this study we used Langmuir monolayers of dimyristoylphosphatidic acid (DMPA) as simplified membrane models to investigate the interplay between the activity of mucins and chitosan. Surface pressure and surface potential measurements were performed with DMPA monolayers onto which chitosan and/or mucin was adsorbed. We found that the expanding effect from mucin was considerably reduced when chitosan was injected after mucin had been adsorbed on the DMPA monolayer. The results were consistent with the formation of complexes between mucin and chitosan, thus highlighting the importance of electrostatic interactions. Furthermore, chitosan could remove mucin that was co-deposited along with DMPA in Langmuir–Blodgett (LB) films, which could be ascribed to molecular-level interactions between chitosan and mucin inferred from the FTIR spectra of the LB films. In conclusion, the results with Langmuir and LB films suggest that electrostatic interactions are crucial for the mucoadhesive mechanism, which is affected by the complexation between chitosan and mucin

Physical Mapping of the \u3ci\u3eAnopheles\u3c/i\u3e (\u3ci\u3eNyssorhynchus\u3c/i\u3e) \u3ci\u3edarlingi\u3c/i\u3e Genomic Scaffolds

The genome assembly of Anopheles darlingi consists of 2221 scaffolds (N50 = 115,072 bp) and has a size spanning 136.94 Mbp. This assembly represents one of the smallest genomes among Anopheles species. Anopheles darlingi genomic DNA fragments of ~37 Kb were cloned, end-sequenced, and used as probes for fluorescence in situ hybridization (FISH) with salivary gland polytene chromosomes. In total, we mapped nine DNA probes to scaffolds and autosomal arms. Comparative analysis of the An. darlingi scaffolds with homologous sequences of the Anopheles albimanus and Anopheles gambiae genomes identified chromosomal rearrangements among these species. Our results confirmed that physical mapping is a useful tool for anchoring genome assemblies to mosquito chromosomes

Scale of motivations of the senior tourist

25th APDR Congress “Circular Economy Urban Metabolism and Regular Development : Challenges for a Sustainable Future”, July 5-6, Lisboa (Portugal).No incremento do fenómeno turístico, os Açores registaram um crescimento mais intenso desde 2014, tendo alcançado aumentos superiores a 20%, nos dois últimos anos. Este aumento muito significativo do turismo na região requer monitorização e uma estratégia holística assente na economia circular com o desenvolvimento de medidas que possam vir a ter reflexo na promoção da qualidade e na configuração da sustentabilidade socio-ambiental do destino Açores. […]. Com base num conjunto de dezassete itens relativos aos motivos para visitar os Açores foi desenvolvida a Escala de Motivações para os Turistas Seniores (EMTS), a qual revelou boas qualidades psicométricas, designadamente de validade e de fidelidade. Os dados recolhidos por questionário (n=470 turistas que visitaram os Açores) foram analisados com recurso a diversos métodos estatísticos. O conhecimento do perfil do turista sénior, tendo em atenção as suas motivações, ajudará os agentes locais dos setores público e privado a adequarem a sua oferta turística.ABSTRACT: Tourism in the Azores has grown considerably since 2014, having increased over 20% in the last two years. This very significant increase in tourism in the region requires monitoring and a holistic strategy based on the circular economy, with the development of measures that may be reflected in the promotion of quality and in the configuration of socio-environmental sustainability of the Azores destination. […].Based on a set of seventeen items related to the reasons for visiting the Azores, the Motivation Scale for Senior Tourists (EMTS) was developed, which revealed good psychometric qualities, namely validity and fidelity. The data collected by questionnaire (n = 470 tourists who visited the Azores) were analyzed using various statistical methods. The knowledge of the senior tourist profile, taking into account their motivations, help local actors from the public and private sectors to adjust their tourism offer.info:eu-repo/semantics/publishedVersio

Efecto de la temperatura sobre la transferencia de agua durante la deshidratación osmótica de papa (Solanum tuberosum L.)

El principal objetivo de este trabajo fue estudiar la cinética de deshidratación osmótica de papa (Solanum Tuberosum L.). Se comparó el ajuste de los datos experimentales con el modelo cinético fenomenológico y con el modelo de Azuara. Para ello, en cubos de 1 cm de arista se evaluó el efecto de la temperatura (30 ºC, 40 ºC y 50 ºC) sobre los coeficiente de difusión efectiva del agua y sólidos. Se determinó la pérdida de peso de agua y la ganancia de sólidos. Las mayores pérdidas de agua se obtuvieron a la temperatura de 50 ºC. Se calcularon los parámetros cinéticos ajustándose adecuadamente a los modelos matemáticos respectivos para la pérdida de agua y la ganancia de sólidos. Asimismo, se determinó la energía de activación mediante la ecuación de Arrhenius siendo superior la energía de activación para la difusión en la ganancia de sólidos.The main purpose for this work is to study the osmotic dehydration kinetics of potatoes (Solanum Tuberosum L.). Thus, a comparison of fitness for the experimental data related to the phenomenological kinetic model and Azuara’s model was made. When applying to 1 cm size potatoes cubes, effect of temperature (30 ºC, 40 ºC and 50ºC) on effective diffusivity coefficients for both water and solids was measured. Water weight loss and solids increase was determined. The highest water loss occurred at 50 º C. The different models kinetics parameters were calculated and a good fitness to mathematical respective relationships was obtained, both for water loss and solids increments. Furthermore, activation energy when applying Arrhenius equation was calculated, being higher for the diffusivity of solids gain.Facultad de Ciencias Exacta