Te hablo con la historia : experiencia de aprendizaje para el desarrollo del pensamiento crítico en las estudiantes del Liceo Benalcázar – Cali

La historia se ha enseñado a través del tiempo desde la oralidad, logrando pasar así, de generación en generación las enseñanzas o prácticas culturales. Esta transmisión se hacía a partir de los relatos de los sabios – los abuelos – los mayores, por ello, la importancia de buscar en las raíces el saber ancestral y rescatar la oralidad como técnica para la reconstrucción de procesos socio – históricos. La práctica pedagógica, objeto de esta sistematización hizo uso del Podcast como recurso para la enseñanza-aprendizaje de la historia, además de fomentar el desarrollo de habilidades del pensamiento crítico en estudiantes de grado Noveno del Liceo Benalcázar de la ciudad de Cali durante el primer periodo del año académico 2021-2022

Sistema informático web para la gestión de cobranza en el CETIC de la Municipalidad Distrital de Punchana, año 2021

This investigation raised the objective of developing and implementing a web computer system to improve collection management in the Specialized Center for Information and Communication Technology (CETIC), of the district municipality of Punchana, which has a quantitative approach, the level It is a technological application, according to the intervention of the researcher it is pre-experimental, the number of measurements is cross-sectional and the data planning is prospective, the sample design was taken from the study population, the recording times of the operations carried out to measure the variable dependent on the management processes in the CETIC such as the registration of payments, registration, registration of new personnel and the generation of reports (20, 20, 10 and 10 time records respectively), the data collection method being a specialized stopwatch, the results were largely very satisfactory, achieving an effectiveness in the registration of registrations of 114%, in the registration of personnel 136%, the registration of payments 126% and in the generation of management reports 15,246%, of In this way, the Research Hypothesis is accepted: "If the web computer system is implemented, then the collection management will be optimized in the CETIC, of the district municipality of Punchana, year 2021".Esta investigación se planteó el objetivo desarrollar e implementar un sistema informático web para mejorar la gestión de cobranzas en el Centro Especializado en Tecnología de la Información y Comunicación (CETIC), de la municipalidad distrital de Punchana, la cual tiene un enfoque cuantitativo, el nivel es aplicativo tecnológico, según la intervención del investigador es pre experimental, el número de mediciones es transversal y la planificación de datos es prospectivo, como diseño muestral se tomó a la población de estudio, los tiempos de registros de las operaciones realizadas para medir la variable dependiente de los procesos de gestión en el CETIC como son el registro de pagos, de matrícula, registro de personal nuevo y la generación de reportes ( 20, 20, 10 y 10 registros de tiempos respectivamente), siendo el método de recolección de datos un cronómetro especializado, los resultados fueron en gran medida muy satisfactorios consiguiéndose una efectividad en el registro de matrículas de 114 %, en el registro de personal 136 %, el registro de pagos el 126 % y en la generación de reportes de gestión 15,246 %, de esta manera se acepta la Hipótesis de Investigación: “Si el sistema informático web se implementa, entonces se optimizará le gestión de cobranzas en el CETIC, de la municipalidad distrital de Punchana, año 2021”

Efficiency of different additives in the improvement of the oxidation stability of fatty acid methyl esters with different properties

This study evaluates six formulations in improving the oxidation stability of different fatty acid methyl esters (MEs). Two MEs differed in the unsaturation levels as they were synthesized from different feedstock: a blend of soybean and sunflower oils, and waste cooking oil; they did not fulfill the requirements of the EN 14214 standard concerning their oxidation stability (?0.6 h) and some impurities. The third MEs (SoSuME-EN) were fully compliant with the standard. Five formulations were phenolic-based, containing single or mixed antioxidant compounds of different molecular structures; one was amine-based. Different dosages of the formulations were added to the ME samples (corresponding to the addition range 50?48300 ppm). The MEs stability expressed as induction periods, IP, determined by the Rancimat method, were used for the calculation of stabilization factors, SF, indicating the efficiency of the applied formulation. The formulation containing 2-(1,1-dimethylethyl)- 1,4-benzenediol was the most efficient concerning the lowest consumption rate and the highest SF achieved for the low quality ME. 2,2?-Methylene- -bis-(4-methyl-6-tert-butylphenol) was linked with higher antioxidant potency than the amine-based formulation and the phenolic compounds with two bulky tert-butyl groups. Among the 4 selected phenolic additives, butylated hydroxytoluene and 2,2?-methylene-bis-(4-methyl-6-tert-butylphenol) had similar efficiency in SoSuME-EN (at ?500 ppm they produced SF ? 2), while it took twice of this amount for mixed butylphenols to achieve the same effect.</jats:p

Stability evaluation of biodiesel supplemented with synthetic and bio-based antioxidants by a pressurized accelerated oxidation method

This work examines pressurized accelerated oxidation by a RapidOxy tester as an alternative method for determination of biodiesel oxidation stability. Sunflower oil-based biodiesel was synthesized and treated with antioxidants: tert-butylhydroquinone (TBHQ) - a synthetic antioxidant known for its powerful protective effect, and a mixture of bio-based antioxidant compounds extracted from vinery waste, VWEeth. The antioxidant potency of TBHQ was evaluated at varying temperatures (110 - 140 ?C) and concentrations (250 - 2,000 mg dm-3) by the RapidOxy method; assessment of selected results was performed by comparison with relevant data obtained by the standard Rancimat method. VWEeth was added in two high dosages to biodiesel (87,500 and 150,000 mg dm-3) and analyzed at 140 ?C by the RapidOxy method. Both antioxidants at all applied dosages showed beneficial effects on improving the oxidative stability of biodiesel, but not all of the achieved improvements reached the stability minimum identified by the EN14214 standard. The lowest addition of TBHQ seemed to have a similar effect as the tested dosages of VWEeth but these additions did not increase the induction period above the limit of 8 h; two-fold higher quantity of TBHQ was successful in this respect, increasing the initial oxidation stability by a factor of about 2, which was determined by both methods. The RapidOxy method proved to be a very fast method suitable for testing a large number of samples, which is particularly important for efficient testing of different types and doses of antioxidants.</jats:p

CRUMPLED LEAF supports plastid OUTER ENVELOPE PROTEIN OF 80 KDA complex formation in Arabidopsis

International audienceAbstract Embedded β-barrel proteins in the outer envelope membrane mediate most cellular trafficking between the cytoplasm and plastids. Although the TRANSLOCON AT THE OUTER ENVELOPE MEMBRANE OF CHLOROPLASTS 75-V (TOC75-V)/OUTER ENVELOPE PROTEIN OF 80 KDA (OEP80) complex has been implicated in the insertion and assembly of β-barrel proteins in the outer envelope membrane of Arabidopsis (Arabidopsis thaliana) chloroplasts, relatively little is known about this process. CRUMPLED LEAF (CRL) encodes a chloroplast outer envelope membrane-localized protein, and its loss-of-function mutation results in pleiotropic defects, including altered plant morphogenesis, growth retardation, suppression of plastid division, and spontaneous light intensity-dependent localized cell death. A suppressor screen conducted on mutagenized crl mutants revealed that a missense mutation in OEP80 suppresses the pleiotropic defects of crl. Furthermore, we found that OEP80 complex formation is compromised in crl. Additionally, we demonstrated that CRL interacts with OEP80 in vivo and that a portion of CRL is present at the same molecular weight as the OEP80 complex. Our results suggest that CRL interacts with OEP80 to facilitate its complex formation. CRL is involved in plastid protein import; therefore, the pleiotropic defects in crl are likely due to the combined effects of decreased plastid protein import and altered membrane integration of β-barrel proteins in the outer envelope membrane. This study sheds light on the mechanisms that allow β-barrel protein integration into the plastid outer envelope membrane and the importance of this finding for plant cellular processes

The CRL plastid outer envelope protein supports TOC75-V / OEP80 complex formation in<i>Arabidopsis</i>

AbstractEmbedded β-barrel proteins in the outer envelope membrane mediate most cellular traffic between the cytoplasm and the plastids. Although TOC75-V/OEP80 has been implicated in the insertion and assembly of β-barrel proteins in the outer envelope membrane ofArabidopsis thaliana, relatively little is known about this process.CRUMPLED LEAF(CRL) encodes a protein localizing in the outer envelope membrane, and its loss of function results in pleiotropic defects, including altered plant morphogenesis, growth retardation, suppression of plastid division, and spontaneous light intensity-dependent localized cell death. A suppressor screen conducted on mutagenizedcrlmutants with ethyl methanesulfonate revealed that a missense mutation inOEP80suppressescrl’s pleiotropic defects. Furthermore, we found that the complex formation of OEP80 was compromised incrl. Furthermore, we demonstrated that CRL interacts with OEP80in vivoand that a portion of CRL is present in protein complexes with the same molecular weight as the OEP80-associated complex. Our results suggest that CRL interacts with OEP80 to regulate its complex formation. CRL has been shown to be involved in plastid protein import; therefore, pleiotropic defects incrlare likely due to the combined effects of decreased plastid protein import and altered membrane integration of β-barrel proteins in the outer envelope membrane. This study sheds light on the mechanisms that allow the integration of β-barrel proteins into the outer envelope membrane of plastids and the significance of this finding for plant cellular processes.</jats:p