Effects of extraction pH of chia protein isolates on functional properties

The aim of this work was to study the effect of the extraction pH on the functional properties of chia protein isolates (CPI). Samples were named as CPI10 or CPI12, according to their extraction pH, 10 or 12, respectively. Functional properties were significantly modified by the extraction pH. Color properties revealed that CPI12 presented a lower L* (47.8 ± 0.9 for CPI10 and 30 ± 1 for CPI12). Besides, a higher b* value was obtained for CPI12 (7.0 ± 0.3 for CPI12 and 5.6 ± 0.7 for CPI10), as a result of a higher ash content. CPI12 showed a higher WAC probably due to a higher exposure of polar amino acids (4.4 ± 0.1 g/g and 6.0 ± 0.2 g/g), whereas CPI10 showed a higher ability to bind oil (7.1 ± 0.2 g/g and 6.1 ± 0.2 g/g for CPI10 and CPI12, respectively). CPI10 proved more appropriate as an emulsion stabilizer than CPI12, which could be due to its higher surface hydrophobicity, protein solubility and negative net charge. The d4,3 (μm) was 29.5 ± 0.4 and 20.4 ± 0.3 in emulsions stabilized with CPI12 and CPI10, respectively. Although both isolates underwent heat gelation, they exhibited a weak gel behavior. Overall, CPI10 may be more suitable for the food industry as a meat replacer or extender.Fil: López, Débora Natalia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario; Argentina. Universidad Nacional de Rosario. Facultad de Ciencias Bioquímicas y Farmacéuticas. Departamento de Química y Física. Área Fisicoquímica; ArgentinaFil: Ingrassia, Romina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario; Argentina. Universidad Nacional de Rosario. Facultad de Ciencias Bioquímicas y Farmacéuticas. Departamento de Química y Física. Área Fisicoquímica; ArgentinaFil: Busti, Pablo Andres. Universidad Nacional de Rosario; ArgentinaFil: Wagner, Jorge Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes; ArgentinaFil: Spelzini, Darío. Universidad Nacional de Rosario; Argentina. Pontificia Universidad Católica Argentina "Santa María de los Buenos Aires"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario; ArgentinaFil: Boeris, Valeria. Pontificia Universidad Católica Argentina "Santa María de los Buenos Aires"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario; Argentina. Universidad Nacional de Rosario; Argentin

(PVA/chitosan/fucoidan)-ampicillin: A bioartificial polymeric material with combined properties in cell regeneration and potential antibacterial features

Chitosan, fucoidan, and polyvinyl alcohol are categorized as polymers with biomedical applications. Ampicillin, on the other hand, is considered as an important antibiotic that has shown effectivity in both gram-positive and gram-negative micro-organisms. The aforementioned polymers possess unique properties that are considered desirable for cell regeneration although they exhibit drawbacks that can affect their final application. Therefore, films of these biomaterials were prepared and they were characterized using FTIR, SEM, XRD, degree of swelling and solubility, and MTT assay. The statistical significance of the experiments was determined using a two-way analysis of variance (ANOVA) with p < 0.05. The characterization techniques demonstrated that the obtained material exhibits properties suitable for cell regeneration, and that a higher concentration of natural polymers promotes cells proliferation to a greater extent. The presence of PVA, on the other hand, is responsible for matrix stability and dictates the degree of swelling and solubility. The SEM images demonstrated that neither aggregations nor clusters were formed, which is favorable for the biological properties without detrimental to the morphological and physical features. Cell viability was comparatively similar in samples with and without antibiotic, and the physical and biological properties were not negatively affected. Indeed, the inherent bactericidal effect of chitosan was reinforced by the presence of ampicillin. The new material is an outstanding candidate for cell regeneration as a consequence of the synergic effect that each component provides to the blend. © 2019 by the author.Ministry of Education, Youth and Sports of the Czech Republic, Program NPU I [LO1504

Characterization of a radiator of eight arms with circular polarization

The cross antenna is a printed structure of average profile and circular polarization, which consists of a conductor or tape on a ground plane that follows the contour of a cross with four or more arms and a diameter of about 1.5 wavelengths developed by Antoine Roederer. The antenna is feeded by means of a coaxial line and is finished in an impedance of load, for what it is represented by a behavior of travelling wave. Though in principle the antenna was designed for applications in mobile communications in Band L (1500 MHhz), we present in this work the experimental characterization of an antenna of cross of eight arms that is employed at 10 GHz, with the principal intention of serving as feeder of a parabolic reflector for satellite communications

Estudio aerodinámico computacional en demostradores tecnológicos aeroespaciales (Scramjet) aplicando el efecto tubérculo

En el presente año 2017 con el avance tecnológico y gracias a los estudios e implementación de la biomimética se han implementado diferentes diseños en la industria aérea, naval y automotriz inspirados en la naturaleza animal con el fin de establecer nuevas tecnologías para la optimización y diseño de nuevos vehículos. En este trabajo se aplicó el efecto tubérculo siendo este un diseño inspirado en la forma de la aleta de la ballena jorobada, el cual es un caso interesante de investigación a raíz de sus diferentes cualidades. Estas cualidades de la aleta pectoral de la ballena jorobada fueron estudiadas y analizadas en el vehículo hipersónico aeroespacial brasilero (VHA 14-X B), el cual es una aeronave experimental que opera a velocidades superiores de mach 7 y condiciones atmosféricas de 30 kilómetros de altitud impulsado por un motor de compresión supersónica (scramjet). Con el fin de aumentar las propiedades de rendimiento del VHA (Vehículo Hipersónico Aeroespacial) se verifica la viabilidad que tiene la implementación del efecto tubérculo en esta aeronave estudiando el comportamiento del flujo y sus propiedades a lo largo de cada una de las secciones de compresión del motor utilizando la herramienta de simulación computacional ANSYS-FLUENT, donde se verifican las diferentes configuraciones de tubérculos propuestas. Por lo tanto al realizar estas configuraciones se caracterizan los tubérculos de acuerdo a la posición en la aeronave, la geometría de cada uno de ellos y simulando las condiciones atmosféricas en donde opera el VHA, modificando los diferentes ángulos de ataque que presenta la aeronave durante su operación con el fin de obtener los datos necesarios para el desarrollo del proyecto y así determinar si es viable la aplicación del mismo

NarrowBand IoT Data Transmission Procedures for Massive Machine Type Communications

Large-scale deployments of massive Machine Type Communications (mMTC) involve several challenges on cellular networks. To address the challenges of mMTC, or more generally, Internet of Things (IoT), the 3rd Generation Partnership Project has developed NarrowBand IoT (NB-IoT) as part of Release 13. NB-IoT is designed to provide better indoor coverage, support of a massive number of low-throughput devices, with relaxed delay requirements, and lower-energy consumption. NB-IoT reuses Long Term Evolution functionality with simplifications and optimizations. Particularly for small data transmissions, NB-IoT specifies two procedures to reduce the required signaling: one of them based on the Control Plane (CP), and the other on the User Plane (UP). In this work, we provide an overview of these procedures as well as an evaluation of their performance. The results of the energy consumption show both optimizations achieve a battery lifetime extension of more than 2 years for a large range in the considered cases, and up to 8 years for CP with good coverage. In terms of cell capacity relative to SR, CP achieves gains from 26% to 224%, and UP ranges from 36% to 165%. The comparison of CP and UP optimizations yields similar results, except for some specific configurations.This work is partially supported by the Spanish Ministry of Economy and Competitiveness and the European Regional Development Fund (Projects TIN2013-46223-P, and TEC2016-76795- C6-4-R), and the Spanish Ministry of Education, Culture and Sport (FPU Grant 13/04833)

Diversity and seasonal composition of the scorpiofauna (Arachnida: Scorpiones) of the Choros archipelago (Coquimbo Region, Chile)

Se estudió la composición taxonómica, la abundancia y la estructura espacial y temporal de la escorpiofauna presente en el archipiélago de Los Choros (Región de Coquimbo, Chile). Se registró la presencia de cuatro especies: Bothriurus coriaceus Pocock 1893, Brachistosternus (Brachistosternus) roigalsinai Ojanguren-Affi lastro 2002, Brachistosternus (Brachistosternus) cepedai Ojanguren-Affi lastro et al. 2007a (Bothriuridae) y Caraboctonus keyserlingi Pocock 1893 (Caraboctonidae). Se registraron diferencias entre las especies de escorpiones en sus niveles de abundancia total, presencia y abundancia tanto estacional como en los diferentes ambientes pedológicos. El 53,1% del total de la abundancia correspondió a B. coriaceus, que estuvo presente en ocho de los nueve ambientes pedológicos analizados y mostró actividad en las tres estaciones del año muestreadas, al igual que Br. roigalsinai, el cual representó el 30,3 % de la abundancia total y fue registrado en siete ambientes pedológicos. La especie Br. cepedai tuvo baja abundancia (4,1 %) y su distribución estuvo restringida a los ambientes dunarios, en los meses de primavera y verano. Por otra parte, Caraboctonus keyserlingi representó la situación opuesta, con un 12,5% de la abundancia, restringida a los ambientes de la isla Choros y a los meses de primavera. No existe una estructuración temporal, pero es reconocible un patrón de estructuración espacial. En base a estos antecedentes proponemos que las diferencias en las especies, tanto en su densidad, como en las estrategias de uso y ocupación de los ambientes podrían explicar los patrones observados.We studied the taxonomic composition, abundance and degree of spatial and temporal structure of the scorpion fauna present in Los Choros Archipelago (Coquimbo Region, Chile). We recorded the presence of four species: Bothriurus coriaceus Pocock 1893, Brachistosternus (Brachistosternus) roigalsinai Ojanguren-Affi lastro 2002, Brachistosternus (Brachistosternus) cepedai Ojanguren-Affi lastro et al. 2007a (Bothriuridae) and Caraboctonus keyserlingi Pocock 1893 (Caraboctonidae). Among scorpion species we found differences in the levels of total abundance, seasonal presence and abundance as well as in the different pedological environments. Bothriurus coriaceus accounted for 53.1% of the total abundance, it was recorded in eight of the nine pedological environments studied and showed activity in the three sampled seasons. Likewise, Br. roigalsinai, accounted for 30.3 % of the total abundance and it was recorded in seven pedological environments. The species Br. cepedai had low abundance (4.1 %) and its distribution was restricted to dune environments and to spring–summer seasons. The species Caraboctonus keyserlingi accounted for 12.5% of the abundance and its distribution was spatially restricted to the Los Choros island and spring season months. There is not a temporal structure but a spatial structure pattern is recognized. Based on this background we propose that differences in species adaptability to temporal density as well as their strategies of use and environment occupation could explain the observed patterns.Fil: Pizarro Araya, Jaime. Universidad de la Serena; ChileFil: Ojanguren Affilastro, Andres Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: López Cortés, José Fernando. Universidad de la Serena; ChileFil: Agusto, Pablo. Universidad de la Serena; ChileFil: Briones, Raul. Programa Conservación de Fauna; ChileFil: Cepeda Pizarro, Jorge. Universidad de la Serena; Chil

The Effect of Heterogeneity on the Adsorption Isotherms in Activated Carbon

Los carbones activados (CA) son materiales microporosos que poseen gran capacidad de adsorción. La heterogeneidad de cualquier adsorbente, en particular la de los CA, puede ser separada en dos grandes familias: energética (o superficial) y estructural. La heterogeneidad estructural es causada por la presencia de poros de diferentes tamaños y formas, y por su posible interconexión; mientras que la heterogeneidad energética se origina por las irregularidades superficiales, así como por la presencia de grupos funcionales y/o impurezas. En este trabajo se discutirán diferentes modelos de heterogeneidad superficial en materiales con poros de geometría, tipo placas paralelas, y su efecto sobre las isotermas de adsorción y en las distribuciones de tamaño de poros.Activated carbons (AC) are microporous materials that have high adsorptive capacity. The heterogeneity of any adsorbent, in particular of the AC, can be separated into two large families: energetic and structural. Structural heterogeneity is caused by the presence of pores of different sizes, shapes and how they are interconnected, while the energy heterogeneity is caused by surface irregularities, as well as by the presence of functional groups and / or impurities. In this paper we discuss different models of surface heterogeneity in materials with slit pores and its effect on adsorption isotherms and the pore size distributions (PSD).Fil: Alexandre de Oliveira, José Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Física Aplicada; Argentina. Universidad Nacional de San Luis; ArgentinaFil: Barrera, Deicy. Universidad Nacional de San Luis; ArgentinaFil: Toso, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Física Aplicada; Argentina. Universidad Nacional de San Luis; ArgentinaFil: López, Raúl Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Física Aplicada; Argentina. Universidad Nacional de San Luis; ArgentinaFil: Sapag, Manuel Karim. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Física Aplicada; Argentina. Universidad Nacional de San Luis; ArgentinaFil: Zgrablich, Jorge Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Física Aplicada; Argentina. Universidad Nacional de San Luis; Argentin

Textural Characteristics and Energetic Parameters of Activated Carbon Monoliths: Experiments and Monte Carlo Simulations

Disc-type activated carbon monoliths were prepared through chemical activation of coconut shell and African palm pits with phosphoric acid at different concentrations, without using any binder. The structures thereby produced were studied experimentally by nitrogen adsorption at 77 K, carbon dioxide adsorption at 273 K and immersion calorimetry in benzene. The experimental data allowed the textural and energetic characterization of the microporous solids to be obtained, viz. BET areas between 752 and 1711 m2/g,micropore volumes between 0.32 and 0.61 cm3/g, ultramicropore volumes between 0.11 and 0.24 cm3/g and immersion enthalpy values between 95.85 and 147.7 J/g. Grand Canonical Monte Carlo (GCMC) simulations were used to analyze the experimental results, providing an interpretation of, as well as a more detailed characterization, of the textural properties, such as the determination of the pore-size distribution (PSD) of each material.Fil: Vargas, Diana P.. Universidad Nacional de Colombia; ColombiaFil: Alexandre de Oliveira, José Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Física Aplicada; Argentina. Universidad Nacional de San Luis; ArgentinaFil: Giraldo, Liliana. Universidad Nacional de Colombia; ColombiaFil: Moreno Piraján, Juan Carlos. Universidad de Los Andes; VenezuelaFil: López, Raúl Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Física Aplicada; Argentina. Universidad Nacional de San Luis; ArgentinaFil: Zgrablich, Jorge Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Física Aplicada; Argentina. Universidad Nacional de San Luis; Argentin

Performance Modeling of Softwarized Network Services Based on Queuing Theory with Experimental Validation

Network Functions Virtualization facilitates the automation of the scaling of softwarized network services (SNSs). However, the realization of such a scenario requires a way to determine the needed amount of resources so that the SNSs performance requisites are met for a given workload. This problem is known as resource dimensioning, and it can be efficiently tackled by performance modeling. In this vein, this paper describes an analytical model based on an open queuing network of G/G/m queues to evaluate the response time of SNSs. We validate our model experimentally for a virtualized Mobility Management Entity (vMME) with a three-tiered architecture running on a testbed that resembles a typical data center virtualization environment. We detail the description of our experimental setup and procedures. We solve our resulting queueing network by using the Queueing Networks Analyzer (QNA), Jackson’s networks, and Mean Value Analysis methodologies, and compare them in terms of estimation error. Results show that, for medium and high workloads, the QNA method achieves less than half of error compared to the standard techniques. For low workloads, the three methods produce an error lower than 10%. Finally, we show the usefulness of the model for performing the dynamic provisioning of the vMME experimentally.This work has been partially funded by the H2020 research and innovation project 5G-CLARITY (Grant No. 871428)National research project 5G-City: TEC2016-76795-C6-4-RSpanish Ministry of Education, Culture and Sport (FPU Grant 13/04833). We would also like to thank the reviewers for their valuable feedback to enhance the quality and contribution of this wor

Therapeutic Foci in an Early Dropout Case: Therapist’s and External Judges’ Perspectives

Introducción: es necesario mayor estudio de la experiencia de abandono terapéutico temprano. Indagar sistemáticamente casos únicos puede conformar una respuesta orgánica a este desafío. Objetivos y métodos: se analizó y comparó la evolución de focos terapéuticos, planteados por el terapeuta tratante y por dos juezas externas, para un caso de abandono temprano de psicoterapia psicodinámica focalizada de un trastorno emocional. Ciegos a la codificación de la contraparte, terapeuta y juezas utilizaron el Diagnóstico Psicodinámico Operacionalizado-2 (OPD-2) para generar un perfil psicodinámico y establecer focos de tratamiento. Para cada foco, aplicaron la Escala de Presencia de Foco y la Escala de Cambio Estructural de Heidelberg. Resultados y discusión: se observaron puntos de convergencia y divergencia entre las perspectivas de terapeuta y juezas externas. Se discute la utilidad de dichos puntos para la comprensión del abandono temprano del paciente, así como las implicancias del OPD-2 como herramienta de investigación orientada a la práctica.Introduction: more study on the experience of therapeutic early dropout is needed. The systematic study of psychodynamic single cases can conform an organic response to this challenge. Aims & Methods: therapeutic foci’s evolution, proposed by both treating therapist and two external judges, for the same early dropout case of a focused psychodynamic psychotherapy for an emotional disorder, were analyzed and compared. Blind to the counterpart’s rating process, therapist and judges employed Operationalized Psychodynamic Diagnosis (OPD-2) in order to generate a psychodynamic profile and establish therapeutic foci. For each focus, they applied the Focus Presence Scale and the Heidelberg Structural Change Scale. Results & Discussion: specific convergences’ and discrepancies’ points between therapist’s and judges’ perspectives were observed. Such points’ usefulness for the understanding of patient’s early dropout, together with OPD-2’ implications as a practice-oriented research tool, are discussed.Fil: Juan, Santiago. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Psicología; Argentina. Instituto Universidad de Salud Mental de la Asoc. Psicoanalitica de Buenos Aires; ArgentinaFil: Manubens, Rocío Tamara. Universidad de Buenos Aires. Facultad de Psicología; ArgentinaFil: Chávez, Itzel. Universidad Nacional Autónoma de México; MéxicoFil: López Fediuk, Luciana. Universidad de Buenos Aires. Facultad de Psicología; ArgentinaFil: Roussos, Andres Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Psicología; ArgentinaFil: Gómez Penedo, Juan Martín. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Psicología; Argentin