Central University of Ecuador

About: Central University of Ecuador is a education organization based out in Quito, Ecuador. It is known for research contribution in the topics: Population & Medicine. The organization has 2220 authors who have published 1910 publications receiving 15052 citations.

Planificación financiera de las empresas: el rol de los impuestos o tributos

Abstract: Se realiza un acercamiento teorico conceptual a la planificacion financiera, se identifican sus componentes fundamentales y el rol que juega en los negocios empresariales, se destaca la importancia que tiene para el desarrollo eficiente y la rentabilidad empresarial; se particulariza en la importancia que le confieren algunos autores a los tributos o impuestos como elementos clave de planificacion a partir de la relacion que se establece entre ellos. Se realizo una recopilacion bibliografica y mediante el analisis documental clasico se identificaron los principales autores que han incursionado en el tema. Los recursos de informacion utilizados fueron el buscador general de google, el google academico y el directorio de publicaciones seriadas de acceso abierto (DOAJ). Las fuentes de informacion resultantes consisten en citas, articulos de revistas, tesis y en menor medida monografias que incluyen ponencias de eventos, folletos y libros. Se observo que un porciento notable de los autores incluyen a los impuestos como elemento importante a tener en cuenta en los enfoques de planificacion financiera. Resulto oportuno en la busqueda recuperada de fuentes documentales abordar el sistema tributario en los paises de America Latina con el fin de realizar un acercamiento al rol de los impuestos o tributos en el desarrollo de los paises.

El rol del docente en el contexto universitario: una visión post pandemia

Abstract: La pandemia impactó de forma negativa en todos los ámbitos principalmente en lo económico, en la salud y en la educación; sin embargo, los docentes fueron los únicos que se beneficiaron debido a que se actualizaron en el uso y aplicación de nuevas tecnologías educativas, metodologías activas, contextualizaciones curriculares y evaluaciones asertivas. El objetivo de este artículo editorial es plantear una visión post pandemia del nuevo rol que los docentes tiene que asumir y sus efectos en la formación de estudiantes universitarios. Mediante una investigación de tipo teórica se utilizará la técnica de análisis de contenido, con lo que se establecerá un entendimiento del camino pedagógico que se debe seguir alineado a los requerimientos de aprendizaje, en función a la satisfacción de demanda de profesionales que sean competentes en la sociedad del futuro.

[(7-chloroquinolin-4-yl)amino]acetophenones and their copper(II) derivatives: Synthesis, characterization, computational studies and antimalarial activity.

Abstract: The synthesis of the compounds [(7-chloroquinolin-4-yl)amino]acetophenones (4, 5) and their copper(II) complexes (4a, 5a) is reported. The compounds were characterized using a wide range of spectroscopic and spectrometric techniques, such as FTIR, UV-vis, NMR, EPR, ESI-CID-MS2. The spectral results suggested that the ligand acted as chelating species coordinating the metal through the endocyclic nitrogen of the quinoline ring in both complexes, with general formulae expressed in two ways, according to the phase in which they are: [Cu(L)2Cl2] for solid phase and [Cu(L)2][2Cl] for liquid phase. The EPR study of the Cu (II) complexes indicated a probable distorted tetrahedral coordination geometry. This result was confirmed by the calculated optimized structures at the DFT/B3LYP method with the 6-31G (d,p) basis set. The characterization of the fragmentation pattern of protonated free ligands was extended here to fragments as low as m/z 43, while for coordination complexes it extends to fragments at m/z 80 and m/z 111. The antimalarial activity of the compounds was determined through three different tests: inhibitory activity against in vitro growth of Plasmodium falciparum (W2), inhibition of hemozoin formation (β-hematin) and in vitro inhibitory activity against recombinant falcipain-2, where compound 5 showed considerable activity. However, the activity of free ligands against P. falciparum was increased by complexing with the Cu (II) metal ion. The values of the HOMO-LUMO energy gap of 3.847 eV (4a) and 3.932 eV (5a) were interpreted with high chemical activity and thus, could influence on biological activity. In both compounds, the total electron density surface mapped with electrostatic potential clearly revealed the presence of high negative charge on the Cu atom. Also, this study reported the molecular docking of free ligands (4, 5) using software package ArgusLab 4.0.1. The results revealed the importance of water molecules as interaction bridges through hydrogen bonds between free ligands and β-hematin; at the same time, the hypothesis that π-π interaction between quinoline derivatives and the electronic system of hematin governs the formation of adducts was confirmed.

El ácido giberélico mejora el peso del racimo y el número de bayas de uva (Vitis vinifera L.), cv. Marroo Seedless, cultivado en los Valles interandinos del Ecuador

Abstract: The cultivation of grapes (Vitis vinifera L.) is increasing in the dry tropics and the Andean valleys of Ecuador. However, the quality of the bunch and berries of the 'Marroo Seedless' variety grown in the Valleys needs to be improved to compete with imported fruit. To this end, three experiments were carried out on 8-year-old plants to evaluate the dose and times of application of GA3 (preand post-flowering), manual fruit thinning and branch ringing to increase bunch and berry size. A randomized complete block experimental design with four replicates was used. Bunch size and weight, number of berries per bunch and total soluble solids were evaluated. The results show that the application of GA3 in pre-flowering (10 ppm) increases bunch length and diameter, while the larger equatorial, polar diameter and berry weight was achieved with two applications of GA3 in post-flowering (40+20 ppm) or a single application with 100 ppm of GA3. These results show that the application of GA3 is a technology to improve the physical quality of the berries and grape bunches.

Bioavaliação de estado nutricional do arroz (Oryza sativa L. var. IAC-165) e do feijoeiro (Phaseolus vulgaris L. Var. carioca) utilizando 15N e 32P

Abstract: Rice and bean plants were grown in nutrient solution in the presence of three levels of N, P and K. The method of the bioevaluation of the nutricional status, in which excised roots are allowed to take up tagged elements, in this case 15N and 32P, was compared with foliar analysis. Two main conclusions were drawn: 1) the bioevaluation proved to be an useful and rapid procedure for the diagnosis of the nutricional status of both species, since there was a significant negative correlation between absorption of N and P and dry matter yield; 2) the uptake of the tagged ions with either element by the roots of plants grown under deficient levels of N and P in the nutrient solution was inversely proportional to the leaf concentration of both nutrients.