Dual refractive index and viscosity sensing using polymeric nanofibers optical structures

Porous materials have demonstrated to be ideal candidates for the creation of optical sensors with very high sensitivities. This is due both to the possibility of infiltrating the target substances into them and to their notable surface-to-volume ratio that provides a larger biosensing area. Among porous structures, polymeric nanofibers (NFs) layers fabricated by electrospinning have emerged as a very promising alternative for the creation of low-cost and easy-to-produce high performance optical sensors, for example, based on Fabry-Perot (FP) interferometers. However, the sensing performance of these polymeric NFs sensors is limited by the low refractive index contrast between the NFs porous structure and the target medium when performing in-liquid sensing experiments, which determines a very low amplitude of the FP interference fringes appearing in the spectrum. This problem has been solved with the deposition of a thin metal layer (∼ 3 nm) over the NFs sensing layer. We have successfully used these metal-coated FP NFs sensors to perform several real-time and in-flow refractive index sensing experiments. From these sensing experiments, we have also determined that the sponge-like structure of the NFs layer suffers an expansion/compression process that is dependent of the viscosity of the analyzed sample, what thus gives the possibility to perform a simultaneous dual sensing of refractive index and viscosity of a fluid

Nuevos registros de distribución de Corydalidae (Megaloptera) en Honduras y Nicaragua

The Corydalidae (Megaloptera) has around 380 species worldwide. Despite some are exclusively Mesoamerican, few species are known for Honduras and Nicaragua. As a result of the revision of material in the collections of Honduras, eight species are recorded por the first time for Honduras and four for Nicaragua. In addition, the genus Chloronia is recorded for the first time for Honduras.La familia Corydalidae (Megaloptera) posee alrededor de 380 especies a nivel mundial. A pesar de que algunas especies son exclusivamente mesoamericanas son pocas las conocidas para Honduras y Nicaragua. Producto de la revisión de colecciones en Honduras, se registran ocho especies por primera vez para Honduras y cuatro por primera vez para Nicaragua. Adicionalmente, se registra el género Chloronia por primera vez para Hondura

Human Data Model: An Approach for IoT Applications Development for Elderly Healthcare

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Layered Interoperability for Collaborative IoT Applications

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Optical sensors based on polymeric nanofibers layers created by electrospinning

Porous materials have become ideal candidates for the creation of optical sensors that are able to reach extremely high sensitivities, due to both the possibility to infiltrate the target substances on them and to their large surface-to-volume ratio. In this work, we present a new alternative for the creation of porous optical sensors based on the use of polymeric nanofibers (NFs) layers fabricated by electrospinning. Polyamide 6 (PA6) NFs layers with average diameters lower than 30 nm and high porosities have been used for the creation of Fabry-Pérot optical sensing structures, which have shown an experimental sensitivity up to 1060 nm/RIU (refractive index unit). This high sensitivity, together with the low production cost and the possibility to be manufactured over large areas, make NFs-based structures a very promising candidate for the development of low-cost and high performance optical sensors

Hydrological dataset of a sub-humid continental plain basin (Buenos Aires, Argentina)

The Chaco-Pampean Plain (Argentina) is the strongest economic region and the most inhabited in the country, comprising approximately 66% of the country's population (26,500 million). In this region, surface slopes are very low (<0.1%) and due to the current climatological features, floods and droughts alternate over time. Salinity and alkalinity of water and soil increase towards the flattest sector of the basin, as well as the contents of arsenic and fluoride, which restrict their human use. Worldwide, population growth and global warming, in addition to political decisions, are leading to abrupt land use changes. Under this premise, identifying and quantifying the hydrological processes that control water quantity and its chemical quality become an imperative task. This data article provides a long-term hydrological dataset from a sector of the Chaco-Pampean Plain, the Del Azul creek basin. Hydrological data such as flow rates and piezometric levels, and physical–chemical (i.e., major and minor solutes, and trace elements) and isotopic (δ18O, δ2H; and d-excess) data from rainwater, surface (creek and wetland) and groundwater (at two depths) are available. Rainwater samples are derived from three precipitation collectors installed at different altitudes (monitoring period: 2010–2019; n = 57). Surface water samples were collected at three sampling sites located along the Del Azul Creek and six wetlands (monitoring period: 2018–2019; n = 12). Groundwater samples were collected from 17 piezometers with depths ranging between 3 and 10 m, and from 12 piezometers of 30 m depth, all located throughout the entire basin (monitoring period: 2018–2019; n = 115). Sampling campaigns were performed during the austral dry (summer) and wet (spring) seasons. This dataset provides useful information to understand a) how water moves from recharge to discharge areas, b) how water acquires salinity, and c) how particular solutes of concern, such as arsenic and fluoride, are distributed in space and time across in an extensive plain.Fil: Zabala, Maria Emilia. Comisión de Investigaciones Científicas de la Provincia de Buenos Aires. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff". - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff". - Universidad Nacional del Centro de la Provincia de Buenos Aires. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff"; ArgentinaFil: Sánchez Murillo, Ricardo. Universidad Nacional de Costa Rica; Costa RicaFil: Dietrich, Sebastián. Comisión de Investigaciones Científicas de la Provincia de Buenos Aires. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff". - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff". - Universidad Nacional del Centro de la Provincia de Buenos Aires. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff"; ArgentinaFil: Gorocito, Martin. Universidad Nacional del Centro de la Provincia de Buenos Aires. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff"; ArgentinaFil: Vives, Luis Sebastián. Universidad Nacional del Centro de la Provincia de Buenos Aires. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff"; ArgentinaFil: Manzano, Marisol. Universidad Politécnica de Cartagena. Departamento de Ingeniería Minera y Civil; EspañaFil: Varni, Marcelo Raúl. Universidad Nacional del Centro de la Provincia de Buenos Aires. Instituto de Hidrología de Llanuras "Dr. Eduardo Jorge Usunoff"; Argentin

Características de las microempresas del sector confecciones de la localidad barrios unidos de Bogotá D.C. como potenciales usuarias de una Spin Off universitaria

El presente estudio describe el rol que han tenido y tienen las microempresas en la economía colombiana, y como todos estos micro negocios tienen diversas limitaciones y falencias en campos como, procesos de formalización, metodologías contables, generación de indicadores de gestión e incorporación de tecnología a los procesos contables. Datos que además se hallaron en la GEM. (Gran encuesta a los Microempresarios) donde se asegura que “La mitad de las microempresas encuestadas no lleva ningún tipo de contabilidad (61% en comercio, 57% en servicios y 53% en industria), dando señales de elevada informalidad. Por su parte, la cuarta parte de los microempresarios tiene un contador (25% en comercio, 22% en servicios y 26% en industria) y entre 8% (comercio) y 15% (industria) tienen un software y un contador.” (Clavijo, 2018). Las pymes corresponden al segmento de alto crecimiento en nuestro país, siendo su participación, del 73%, seguido de las grandes que aglutinan el 27% restante. De acuerdo con el Departamento Administrativo Nacional de Estadística DANE, las empresas de menor tamaño son las que generan alrededor del 67% del empleo y cerca del 28% del PIB. Es así que esta investigación pretende realizar una caracterización de un sector de microempresarios dedicados a la actividad de confección ubicados en la ciudad de Bogotá Localidad Barrios unidos buscando resaltar sus cualidades, limitación, falencias y demás aspectos que inciden en el desarrollo de su actividad comercial. Por otra parte se desarrolla un análisis referente a las spin-off universitarias y como estas se han convertido en los últimos años en una modalidad importante de negocio entre los centros de investigación y tecnología universitarios y el sector empresarial tanto privado como público; esto ha conllevado a ser motivo de estudio, por el importante papel que se atribuye a los procesos de innovación, la creación de nuevos empleos, el apoyo económico a emprendimientos de jóvenes universitarios y el aporte al desarrollo socioeconómico. Se realiza una mirada relacionada con las spin off como estrategia de negocio y referente de innovación actualmente y las microempresas como el segmento que potencialmente podría hacer uso de los servicios de la spin off. Igualmente, se muestra los resultados del instrumento aplicado en la población objetivo. Finalmente, se enuncian algunas conclusiones relacionadas con la temática abordada.This study describes the role that microenterprises have played in the Colombian economy, and how all these micro businesses have various limitations and shortcomings in fields such as formalization processes, accounting methodologies, generation of management indicators and incorporation of technology into the accounting processes. Data that was also found in the GEM. (Large survey of Microentrepreneurs) where it is ensured that "Half of the surveyed microenterprises do not carry any type of accounting (61% in commerce, 57% in services and 53% in industry), showing signs of high informality. For its part, a quarter of microentrepreneurs have an accountant (25% in commerce, 22% in services and 26% in industry) and between 8% (commerce) and 15% (industry) have a software and an accountant. “(Clavijo, 2018). SMEs correspond to the segment of high growth in our country, with their participation, of 73%, followed by the large ones that agglutinate the remaining 27%. According to the National Administrative Department of Statistics DANE, smaller companies generate around 67% of employment and close to 28% of GDP. Thus, this research aims to characterize a sector of microentrepreneurs engaged in the clothing industry located in the city of Bogotá Barrios Unidos neighborhood seeking to highlight their qualities, limitations, shortcomings and other aspects that affect the development of their business. On the other hand, an analysis is developed regarding university spin-offs and how these have become in recent years an important business modality between university research and technology centers and the private and public business sector; This has led to being a reason for study, due to the important role attributed to innovation processes, the creation of new jobs, economic support for university youth undertakings and the contribution to socioeconomic development. A look is made related to the spin off as a business strategy and a benchmark for innovation currently and microenterprises as the segment that could potentially make use of spin-off services. Likewise, the results of the instrument applied in the target population are shown. Finally, some conclusions related to the topic addressed are stated

Inteligencia emocional en familia: un programa formativo para padres e hijos de 3 a 6 años

Diversos estudios indican que, a partir de los 3 años, momento en que la mayoría de niños inician la vida escolar y amplían su círculo social, ya pueden ser desarrolladas las habilidades emocionales. Sin embargo, pocas propuestas han puesto el foco en desarrollar estas habilidades directamente en el núcleo familiar en lugar de en la escuela. El objetivo del presente trabajo es facilitar el desarrollo de la inteligencia emocional en niños de 3 a 6 años mediante la colaboración de sus progenitores. El resultado de este trabajo es un programa pedagógico que consta de dos fases. En la primera etapa de la propuesta, compuesta por cinco sesiones, los progenitores incorporan conocimientos sobre la IE con el objetivo de mejorar sus habilidades emocionales; en la segunda etapa, padres y madres deben instruir a sus hijos en la IE mediante siete actividades lúdicas. Se concluye que la formación en IE a edades tempranas resulta fundamental para el correcto desarrollo personal y socioemocional, y se proponen distintas implicaciones prácticas en relación a la acción formativa.Previous studies suggest that at the age of 3, a moment when most infants begin their school life and expand their social circle, emotional skills can already be developed. However, very few proposals have focused on developing these skills directly in the family nucleus rather than in the school. This study aims to assist the development of emotional intelligence in children from 3 to 6 years old through the collaboration of their parents. The result of this study is a pedagogical program that consists of two phases. In the first stage of the proposal, which comprises five sessions, parents incorporate knowledge about EI to enhance their emotional skills; in the second stage, parents instruct their children in EI through seven recreational activities. The conclusion is that training in EI at an early age leads to the personal and socialemotional development of the trainees, and different practical implications are proposed regarding the training actio

Implementación de gestión de almacenamiento en la segregación de residuos peligrosos en la empresa Astilleros Luguensi S.A.C. - Chimbote, 2021

La investigación tiene como objetivo general el implementar la gestión de almacenamiento para mejorar la segregación de los residuos peligrosos en la empresa Astilleros Luguensi S.A.C. Para ello se tiene un tipo de investigación aplicada y cuantitativa, con un diseño preexperimental; teniendo como muestra la generación de residuos peligrosos en los años 2021 y 2022. El diagnóstico inicial demostró que no existe una gestión correcta de residuos peligrosos ya que se tiene una media de cumplimiento del 40%; bajo lo evaluado se seleccionó los cilindros de aceite y pilas como residuo critico ya que no se disponen adecuadamente, en tanto a los fluorescentes y baterías también se seleccionaron críticos dado que muchos de ellos permanecen en la empresa por más de un mes. Para establecer una solución se proyecta la cantidad de residuos disponibles con el fin de determinar el espacio del almacén temporal (29 m2 ) y general (59 m2 ); así mismo se establecieron procedimientos, registros y guias de verificación, el resultado de estos cambios disminuyó el estancamiento de residuos en un 8% y las salidas inadecuadas en un 50%; es así que se concluyó que la gestión de almacenamiento disminuye la segregación de residuos peligrosos

In vitro maturation of Toxoplasma gondii bradyzoites in human myotubes and their metabolomic characterization

The apicomplexan parasite Toxoplasma gondii forms bradyzoite-containing tissue cysts that cause chronic and drug-tolerant infections. However, current in vitro models do not allow long-term culture of these cysts to maturity. Here, we developed a human myotube-based in vitro culture model of functionally mature tissue cysts that are orally infectious to mice and tolerate exposure to a range of antibiotics and temperature stresses. Metabolomic characterization of purified cysts reveals global changes that comprise increased levels of amino acids and decreased abundance of nucleobase- and tricarboxylic acid cycle-associated metabolites. In contrast to fast replicating tachyzoite forms of T. gondii these tissue cysts tolerate exposure to the aconitase inhibitor sodium fluoroacetate. Direct access to persistent stages of T. gondii under defined cell culture conditions will be essential for the dissection of functionally important host-parasite interactions and drug evasion mechanisms. It will also facilitate the identification of new strategies for therapeutic intervention.Peer Reviewe