INICIACIÓN A LA PRÓTESIS BUCODENTAL

GUÍA PEDAGÓGIC

La rentabilidad del activo en la empresa Sociedad Minera Cerro Verde S.A.A., período 2016-2020

La presente tesis tuvo como objetivo general Analizar la situación de la rentabilidad del activo en la empresa Sociedad Minera Cerro Verde S.A.A., periodo 2016-2020 y así mismo se consideró el problema general que motivo la elaboración del presente trabajo de investigación para absolver cuál es la situación de la rentabilidad del activo en la empresa Sociedad Minera Cerro Verde S.A.A., donde se aplicó la investigación de tipo aplicada, descriptivo simple, diseño no experimental y corte longitudinal ya que se tomaron información de cinco periodos. La población fue los estados financieros como Estado de situación financiera y Estado de resultados integrales de la empresa Sociedad Minera Cerro Verde S.A.A., técnica fue el análisis documental y como instrumento la guía de análisis documental. Los resultados del periodo 2019 de la rentabilidad del activo o rentabilidad económica (ROA) se consiguió de manera positiva lo cual la ganancia obtenida por medio del estado de resultados es de 390, 377 mil dólares esto representa una buena cantidad en comparación al año 2016, 2017, 2020 en el cual se mantuvo la rentabilidad del activo a 0.04 a pesar que en el año 2020 le empresa fue afectada como muchas empresas con la pandemia COVID-19 lo cual para reactivar sus operaciones el gobierno aprobó el Plan de Vigilancia, Prevención y Control de la COVID-19, por tanto la empresa ha generado ganancias y pocas veces son los periodos de pérdidas de años anteriores así como el periodo del 2018 donde se obtuvo las utilidades más bajas de la rentabilidad del activo con 0,02 de los cinco periodos y representado en dólares 119,710 en utilidad neta. Finalmente cabe mencionar que se obtuvo información de fuentes secundarias como es Superintendencia de Mercado de Valores (SMV)

Estudio parasitológico en refrescos de ventas ambulantes que se expenden en la ciudad de San Salvador.

Las infecciones del tubo digestivo son un problema de salud que se observa con frecuencia en la mayoría de países subdesarrollados. En El Salvador, el más alto número de casos de enfermedades diarreicas se da en niños menores de dos años, índice que disminuye a medida que aumenta la edad. Usualmente la forma como se adquieren estas afecciones es por ingestión de agentes patógenos lo cual puede ocurrir en forma directa por las manos del mismo individuo infectado ano-boca o indirectamente por la ingestión de alimentos contaminados con heces fecales las que pueden ir diluidas en bebidas como el agua, leche, refrescos o estar presentes en otra clase de alimentos como por ejemplo: frutos y hortalizas, principalmente los que se ingieren sin previo cocimiento

Nutritional contribution of torula yeast and fish meal to the growth of shrimp Litopenaeus vannamei as indicated by natural nitrogen stable isotopes

Torula yeast (Candida utilis) and fish meal were used to formulate six experimental diets for Pacific white shrimp Litopenaeus vannamei. The dietary nitrogen supplied by fish meal was replaced by increasing dietary proportions of torula yeast (0, 7.5, 15, 30, 60 and 100%). Nitrogen stable isotope values (δ15N) were measured in ingredients, diets and muscle tissue of experimental animals in order to estimate the relative contributions of dietary nitrogen and dry matter supplied by both ingredients. At the end of a 29 d bioassay, there were no significant differences in survival rate among treatments. Shrimps fed on all diets containing torula yeast and fish meal had higher growth rates (k = 0.059-0.064) than animals fed on diets containing only fish meal or only torula yeast (k = 0.041-0.054). Incorporation of δ15N values of ingredients and muscle tissue into an isotopic mixing model indicated that the relative incorporation of dietary nitrogen and total dry matter from torula yeast to growth consistently increased in relation to increasing proportions of this ingredient in the experimental diets. The only exception was the diet formulated with the highest yeast content (60%, diet 40F/60T) where fish meal contributed a higher proportion of dietary nitrogen to growth. Dietary nitrogen from torula yeast available in diets 93F/7T, 85F/15T, 70F/30T and 40F/60T was incorporated in muscle tissue at proportions of 6.5, 13.7, 27.1 and 50.5 %, respectively. Estimated nitrogen residency time in tissue (t50) was relatively shorter in shrimps fed on diets 85F/15T and 70F/30T (3 d), indicating higher metabolic turnover rates in these animals than those fed on diet containing only fish meal. Growth and survival rates were statistically similar in shrimp fed on all mixed diets, therefore indicating the suitability of this single cell protein as dietary ingredient in diets containing up to 60% of torula yeast

Simultaneous estimation of the nutritional contribution of fish meal, soy protein isolate and corn gluten to the growth of Pacific white shrimp (Litopenaeus vannamei) using dual stable isotope analysis

The nutritional contribution of the dietary nitrogen, carbon and total dry matter supplied by fish meal (FM), soy protein isolate (SP) and corn gluten (CG) to the growth of Pacific white shrimp Litopenaeus vannamei was assessed by means of isotopic analyses. As SP and CG are ingredients derived from plants having different photosynthetic pathways which imprint specific carbon isotope values to plant tissues, their isotopic values were contrasting. FM is isotopically different to these plant meals in regards to both, carbon and nitrogen. Such natural isotopic differences were used to design experimental diets having contrasting isotopic signatures. Seven isoproteic (36% crude protein), isoenergetic (4.7 Kcal gr-1) diets were formulated; three diets consisted in isotopic controls manufactured with only one main ingredient supplying dietary nitrogen and carbon: 100 % FM (diet 100F), 100% SP (diet 100S) and 100% CG (diet 100G). Four more diets were formulated with varying mixtures of these three ingredients, one included 33% of each ingredient on a dietary nitrogen basis (diet 33FSG) and the other three included a proportion 50:25:25 for each of the three ingredients (diets 50FSG, 50SGF and 50GFS). At the end of the bioassay there were no significant differences in growth rate in shrimps fed on the four mixed diets and diet 100F (k = 0.215-0.224). Growth rates were significantly lower (k = 0.163-0.201) in shrimps grown on diets containing only plant meals. Carbon and nitrogen stable isotope values (δ13C and δ15N) were measured in experimental diets and shrimp muscle tissue and results were incorporated into a three-source, two-isotope mixing model. The relative contributions of dietary nitrogen, carbon and total dry matter from FM, SP and CG to growth were statistically similar to the proportions established in most of the diets after correcting for the apparent digestibility coefficients of the ingredients. Dietary nitrogen available in diet 33FSG was incorporated in muscle tissue at proportions representing 24, 35 and 41% of the respective ingredients. Diet 50GSF contributed significantly higher amounts of dietary nitrogen from CG than from FM. When the level of dietary nitrogen derived from FM was increased in diet 50FSG, nutrient contributions were more comparable to the available dietary proportions as there was an incorporation of 44, 29 and 27% from FM, SP and CG, respectively. Nutritional contributions from SP were very consistent to the dietary proportions established in the experimental diets

Incorporation of dietary nitrogen from fish meal and pea meal (Pisum sativum) in muscle tissue of Pacific white shrimp (Litopenaeus vannamei) fed low protein compound diets

Stable isotope analyses were applied to explore the relative dietary nitrogen contributions from fish meal and pea meal (Pisum sativum) to muscle tissue of Pacific white shrimp postlarvae (141 ± 31 mg) fed low protein diets having different proportions of both ingredients as the sole dietary protein sources. A negative control diet was formulated to contain 100% pea meal and six more isoproteic diets to have decreasing levels of pea meal-derived nitrogen: 95, 85, 70, 55, 40 and 0 % of the initial level. Growth rates were negatively correlated to dietary pea protein inclusion due to progressive essential amino acid deficiencies (sulfur amino acids, threonine, lysine, histidine). The nitrogen turnover rate significantly increased in muscle tissue of shrimps fed diets having high levels of pea meal; however, contrary to observations from a previous study using soy protein , the relative contributions of dietary nitrogen from pea meal to shrimp muscle tissue were equal or higher than expected contributions established by the dietary formulations. Results highlight the effectiveness of stable isotope analysis in assessing the nutritional contributions of alternative ingredients for aquaculture feeds and the potential suitability of pea as a source of protein (provided the diets are nutritionally balanced)

Rodríguez Pérez Reyna Elizabeth, Cruz Silva Blanca Guadalupe (2016) Análisis de potencialidades y estrategias de desarrollo rural con perspectiva sustentable en Benjamín Hill, Sonora. Universidad Autónoma de Coahuila Unidad Saltillo, Universidad Tecnológica de Hermosillo. México. ISBN: 978-607-506-245-7.

Por años, la principal actividad económica de Benjamín Hill, dependió de ferrocarriles Nacionales, porque impulsaba actividades de comercio, servicios y producción de artículos locales. El cierre de Ferrocarriles afectó la economía regional. Las preguntas centrales a partir de las cuales se planteó la realización de la obra, se encuentran: ¿Qué ocurrió con el sector productivo de Benjamín Hill después del cierre del ferrocarril? ¿Cuáles son las potencialidades de desarrollo que posee? ¿Cuáles son las actividades económicas que se desarrollan? ¿Qué ideas de proyectos productivos se tienen actualmente? El objetivo de este libro es mostrar un panorama general de Benjamín Hill, que refleje situación actual y potencialidades de evolución basadas en identificación de proyectos productivos viables, que se inscriban en estrategias de desarrollo regional sustentable y constituyan alternativas de empleo sostenible. Los resultados muestran situación económica y social de la localidad, y diferentes ideas que reflejan proyectos productivos con enfoque sustentable, detectados mediante estudios de mercado en torno a actividades de producción de ovinos, aprovechamiento de mezquite, elaboración de productos regionales, análisis de viabilidad para actividades hípicas, desarrollo de ranchos cinegéticos, fomento del turismo, actividades culturales como el impulso al museo ferrocarrilero y un análisis para la reinstalación del zoológico

Contribución de la implementación de estrategias didácticas inclusivas al desarrollo de competencias personales y sociales de manera integral en los Estudiantes Universitarios con Discapacidad, durante el año 2020

La investigación plantea una serie contenidos que permiten conocer la contribución que tiene la implementación de estrategias didácticas inclusivas en la formación de los estudiantes universitarios con discapacidad, principalmente en estudiantes con discapacidad visual y auditiva. Se abordan una serie de estrategias didácticas que favorecen la inclusión y el desarrollo de competencias genéricas y específicas para lograr un desarrollo integral del estudiante. Además, se hace un análisis desde la perspectiva de diversos autores que abordan el tema de la educación inclusiva de forma integral para determinar una línea a seguir en la mejora de la calidad educativa que se le ofrece al estudiante con discapacidad

Isotopic Evaluation of the Nutritional Contribution of Poultry By-product Meal and Fish Meal to the Growth of Pacific White Shrimp, Litopenaeus vannamei

The nutritional contribution of the dietary nitrogen supplied by poultry by-product meal (PBM) and fish meal (FM) to the somatic growth of Pacific white shrimp, Litopenaeus vannamei was assessed by means of stable isotope analysis. Seven experimental diets were formulated with different proportions of PBM replacing FM. Mixed diets were formulated to replace 0, 35, 50, 65, 80, 95 and 100 % of FM with PBM, on a dietary nitrogen basis. At the end of the experiment, there were no significant differences in survival among dietary treatments (89±5 %); however, significant differences in final wet weights were observed. Diets having FM replacement levels of 35 and 50% with PBM, promoted mean final weights (708-789 mg) similar to those observed in shrimps fed on diet containing 100% FM (874 mg). Shrimp final mean weight significantly decreased as a function of PBM inclusion (r= -0.98) due to the use of only two dietary nitrogen sources and by possible nutritional restrictions as PBM levels increased. The relative proportions of dietary nitrogen supplied by PBM and FM were incorporated in muscle tissue at proportions that were statistically similar to those established in the dietary formulations

Digestibility of different wheat products in white shrimp Litopenaeus vannamei juveniles

Dry matter, energy, crude protein and amino acid apparent digestibility coefficients (ADCs) were determined in white shrimp juveniles for six wheat products: hard red winter whole grain meal (HWG), Rayon whole grain meal (RWG), Durum whole grain meal (DWG), hard red winter clear flour (HCF), mixed wheat 2nd clear flour (MCF) and semolina (S). The test diets included 30% of the test ingredients and 70% of a ground commercial diet supplemented with 1% chromic oxide and 1% sodium alginate. Amino acid contents in the ingredients, diets and feces were analyzed, and digestibility was determined by difference in order to minimize the impact of endogenous amino acid losses; crude protein and amino acids ADCswere adjusted for dietary preprandial losses in seawater. In general, nutrients digestibility was far higher in the wheat products than in the fish meal-based reference diet. Drymatter and crude proteinADCswere not statistically different amongwheat products (from84 to 96% and from88 to 107% respectively). Energy ADCs were significantly higher for clear flours (96% for HCF and MCF) than forwhole grainmeals and S (from83 to 86%). Total amino acids (TAA) and essentialamino acids (EAA) ADCs, once adjusted for preprandial leaching fromthe experimental diets, ranged from81 to 89% and from 58 to 81% respectively, and were statistically comparable among wheat products. Low Thr ADCs appear as a common feature of the amino acids digestibility profiles for whole grain meals, clear flours, or semolina