CONFIGURACIONES DE LAS REDES ELÉCTRICAS DE DISTRIBUCIÓN PRIMARIA QUE DETERIORAN SU EFICIENCIA ENERGÉTICA (Original)

In this paper has been carried out a bibliographical revision to evaluate how they influence in the steady-state operating point of operation of the electric primary three phases networks the employment of brunches single-phase and two-phases, as well as the connection shatters opened delta and to determine its influence in the costs from the electric power losses when increasing these along the circuit.En este trabajo se ha realizado una revisión bibliográfica para evaluar cómo influyen en el régimen de operación de las redes eléctricas primarias trifásicas el empleo de ramales monofásicos y bifásicos, así como la conexión estrella delta abierta y determinar su influencia en los costos de las pérdidas de energía eléctrica al aumentar estas a lo largo del circuito

A Review of Fingerprint Feature Representations and Their Applications for Latent Fingerprint Identification: Trends and Evaluation

Latent fingerprint identification is attracting increasing interest because of its important role in law enforcement. Although the use of various fingerprint features might be required for successful latent fingerprint identification, methods based on minutiae are often readily applicable and commonly outperform other methods. However, as many fingerprint feature representations exist, we sought to determine if the selection of feature representation has an impact on the performance of automated fingerprint identification systems. In this paper, we review the most prominent fingerprint feature representations reported in the literature, identify trends in fingerprint feature representation, and observe that representations designed for verification are commonly used in latent fingerprint identification. We aim to evaluate the performance of the most popular fingerprint feature representations over a common latent fingerprint database. Therefore, we introduce and apply a protocol that evaluates minutia descriptors for latent fingerprint identification in terms of the identification rate plotted in the cumulative match characteristic (CMC) curve. From our experiments, we found that all the evaluated minutia descriptors obtained identification rates lower than 10% for Rank-1 and 24% for Rank-100 comparing the minutiae in the database NIST SD27, illustrating the need of new minutia descriptors for latent fingerprint identification.This work was supported in part by the National Council of Science and Technology of Mexico (CONACYT) under Grant PN-720 and Grant 63894

Caracterización morfológica cualitativa en campo de plantas de Sorghum bicolor (L.) Moench cultivar ‘CIAP 132R-05’ regeneradas vía embriogénesis somática

The phenotypic stability of plants obtained under in vitro conditions is essential for the success of any plant regeneration protocol. The present work was carried out with the aim to characterize morphologically, through qualitative characters and in field conditions, plants of Sorghum bicolor (L.) Moench cv. 'CIAP 132R-05' regenerated via somatic embryogenesis. Plants obtained from somatic embryos were compared with plants from botanical seed. A description was made at the phenological stages during the growth and development of the plants under field conditions. The qualitative morphological characters of the leaves, the stem and the panicle were evaluated in two progeny. During the cultivation periods there was homogeneity in the stages of development of both plants populations and in the morphological characters evaluated. The population of plants obtained from somatic embryos and evaluated under field conditions, during two generations, showed phenotypic stability in the qualitative morphological characters.Keywords: phenotypic stability, phenological stage, progenies, qualitative charactersLa estabilidad fenotípica de las plantas obtenidas en condiciones in vitro es esencial para el éxito de cualquier protocolo de regeneración de plantas. El presente trabajo se realizó con el objetivo de caracterizar morfológicamente, a través de caracteres cualitativos y en condiciones de campo, plantas de Sorghum bicolor (L.) Moench cultivar ‘CIAP 132R-05’ regeneradas vía embriogénesis somática. Plantas obtenidas de embriones somáticos se compararon con plantas procedentes de semilla botánica. Se realizó una descripción de las etapas fenológicas durante el crecimiento y desarrollo de las plantas en condiciones de campo. Se evaluaron los caracteres morfológicos cualitativos de las hojas, el tallo y la panícula en dos progenies. Durante los periodos de cultivo se produjo homogeneidad en las etapas de desarrollo de las plantas de ambas poblaciones y en los caracteres morfológicos evaluados. La población de plantas obtenidas a partir de embriones somáticos y evaluados en condiciones de campo, durante dos generaciones, manifestó estabilidad fenotípica en los caracteres morfológicos cualitativos. Palabras clave: caracteres cualitativos, estabilidad fenotípica, etapa fenológica, progenie

Caracterización clínico-quirúrgica de pacientes con diagnóstico de invaginación intestinal

Introduction: Intussusception is the leading cause of acute abdomen and intestinal occlusion in infants and young children, with a peak incidence between 5 and 9 months. Objective: To characterize the patients who suffered intussusception in the “Juan Manuel Márquez” Pediatric Hospital in a period of 7 years. Material and methods: An observational, descriptive and cross-sectional study was carried out in patients who suffered intussusception treated at the “Juan Manuel Márquez” Pediatric Hospital, which covered the period from January 1, 2013 to January 1, 2020. A universe of 104 patients diagnosed with intussusception. Absolute frequencies and percentages were used for qualitative variables. Results: Regarding age, the largest number of patients was concentrated in the group from 0 to 6 months with 49 (47.1%). The highest incidence was in male patients with 64 patients. The month with the most cases was in May with a total of 15 cases for 14.42%. When analyzing the treatment, surgical treatment predominated with 80 patients for 76.92%. Conclusions: It was found that intussusception did not occur with great frequency in the period studied, prevailing in male infants in the first 6 months of life. He highlighted vomiting as the main symptom. In general, a predominance of ileocecocolic invaginations and surgical treatment was observed.Introducción: la invaginación intestinal es la primera causa de abdomen agudo y oclusión intestinal en lactantes y niños pequeños, con un pico de incidencia entre los 5 y 9 meses.Objetivo: caracterizar a los pacientes que padecieron invaginación intestinal en el Hospital Pediátrico “Juan Manuel Márquez” en un periodo de 7 años.Material y métodos: se realizó un estudio observacional, descriptivo y transversal en pacientes que padecieron invaginación intestinal tratados en el Hospital Pediátrico “Juan Manuel Márquez”, que abarcó el periodo del 1ro de enero del 2013 al 1ro de enero del 2020. Se estudió un universo de 104 pacientes diagnosticados con invaginación intestinal. Se emplearon frecuencias absolutas y porcentajes para variables cualitativas.Resultados: respecto a la edad el mayor número de pacientes se concentró en el grupo de 0 a 6 meses con 49 (47,1 %). La mayor incidencia resulto en los pacientes masculinos con 64 pacientes. El mes donde mas casos resulto fue en mayo con un total de 15 casos para un 14,42 %. Al analizar el tratamiento predominó el tratamiento quirúrgico con 80 pacientes para un 76,92 %.Conclusiones: se constató que la invaginación intestinal no se presentó con gran frecuencia en el periodo estudiado, predominando en lactantes masculinos en los primeros 6 meses de vida. Destacó el vómito como síntoma principal. En general se observó un predominio de las invaginaciones ileocecocólica y del tratamiento quirúrgico

Characterization of three novel pigment-producing Penicillium strains isolated from the Mexican semi-desert

Fungal pigments are used in diverse industries such as food, pharmaceuticals, textile, among others. The need of new organic pigments involves the search for new microbial sources. In this study, three fungal strains isolated from Quercus sp and Larrea tridentata were morphological, physiological and molecularly characterized. Different temperatures (8, 16, 20, 24 and 32°C) and pH (4, 6, 7, 8 and 10) levels were tested to determine the best conditions to produce a fungal pigment under submerged and solid state fermentation. The three strains were genotyped by using polymerase chain reactionrestriction fragment length polymorphism (PCR-RFLP), random amplified polymorphic DNA (RAPD), inter-transcript spaces (ITS) and intergenic spaces (IGS) with the object to eliminate duplications. The strains were identified according to their morphology as Penicillium purpurogenum (GH2) and Penicillium pinophilum (EH2 and EH3). It was found that at submerged state fermentation to 24°C and pH 10, the three strains produced pigments, but P. purpurogenum GH2 strain produced the highest amount of pigments (1.25 U). According to the molecular analysis, it was found that all strains were different. This is to our knowledge the first report on characterization of fungal strains isolated from the Mexican semi-desert which have potential for pigment production.Keywords: Penicillium purpurogenum, Penicillium pinophilum, intergenic spaces (IGS), inter-transcript spaces (ITS), pigments, polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP), submerged and solid state fermentationAfrican Journal of Biotechnology Vol. 12(22), pp. 3405-341

Characterization of adolescents with excess malnutrition in the Rafael María de Mendive mixed center

Introduction: adolescence is a period of rapid growth and important changes in body composition; it is a stage with a high prevalence of nutritional disorders, and excess malnutrition is among the most frequent. Objectives: to characterize adolescents with excess malnutrition belonging to the Rafael María de Mendive Mixed Center of the Sandino municipality in the period from September 2020 to January 2021. Method: a descriptive, retrospective, cross-sectional study was carried out. The universe was represented by 552 adolescents, between 12 and 17 years of age, the sample consisted of 197 adolescents of either sex by simple random sampling. A descriptive statistical analysis was applied by calculating the numerical and percentage distribution, as well as the mean and standard deviation. The variables used were age, sex, birth weight, blood pressure, risk factors and biochemical variables. Results: obese adolescents were predominantly male (50,8 %), in the age group between 16 and 17 (37,6 %). Among normal-weight patients, normal blood pressure figures predominated (81,2%) and normal values were found in 43,7 % of overweight patients. Abdominal obesity was the most frequent risk factor (100 %). Conclusions: in the Rafael María de Mendive Mixed Center of the Sandino municipality, there is a predominance of obsessive adolescents of the male sex. Blood pressure figures were normal in most adolescents. The main risk factor was abdominal obesity

Obtención de híbridos intergenéricos Helianthus annuus x Tithonia rotundifolia y su análisis morfológico y molecular

Hybridization between the cultivated sunflower Helianthus annuus and the wild species with ornamental potential Tithonia rotundifolia was performed. From three cultivated materials: AN-3, Primavera and HA 89, the only success was obtained with the public cultivated sunflower line HA 89 as female parent. The male parent was a T. rotundifolia population collected in the state of Guerrero, Mexico. A total of 826 well developed hybrid achenes were produced, with a rate of success of four in 1000 potential achenes. In a sample of 49 plants established in the experimental field, two phenotypic classes were observed: a) plants with many small inflorescenses, and b) plants with a single big head and a few or none axillary inflorescenses. Both types were morphologically characterized and showed a clearly hybrid morphology. Additionally, the AFLP-based DNA fingerprints were analyzed in a sample of ten familial trios, with an average of 28 polymorphisms per trio. The DNA fingerprinting analysis of the plants complemented the morphological study, allowed confirmation of the hybrid nature of the progenies and ruled out the partial hybridization phenomenon. All the hybrid plants showed sterility. From this work, it becomes clear that chromosomic manipulation or tissue culture techniques are needed to develop fertile hybrids with ornamental potential.Se realizó el cruzamiento entre el girasol cultivado Helianthus annuus y la especie silvestre con potencial ornamental Tithonia rotundifolia. De tres materiales cultivados: AN-3, Primavera y HA 89, sólo se tuvo éxito con la línea pública de girasol cultivado HA 89 como progenitor femenino. A su vez el masculino fue una población de T. rotundifolia recolectada en el estado de Guerrero, México. Se produjeron 826 aquenios híbridos bien desarrollados, con una tasa de éxito de cuatro en 1000 aquenios potenciales. Dentro de una muestra de 49 plantas establecidas en el campo experimental, se observaron dos clases fenotípicas: a) individuos con muchas inflorescencias pequeñas y b) otros con cabezuela solitaria grande y con pocas o ninguna inflorescencia axilar. Ambos tipos fueron caracterizados morfológicamente y presentaron rasgos claramente híbridos. Además, se analizó la huella genética, a través del polimorfismo en la longitud de los fragmentos amplificados (AFLPs), de una muestra de diez tríos familiares de cruzamientos, con un promedio de 28 polimorfismos por trío. El análisis de huella genética de las plantas complementó al estudio morfológico, permitió constatar la naturaleza híbrida de las progenies y descartar el fenómeno del cruzamiento parcial. Todas las plantas experimentales obtenidas resultaron ser estériles. Del presente trabajo se desprende que se requiere de manipulación cromosómica o técnicas de cultivo de tejidos para el desarrollo de híbridos fértiles con potencial ornamental

Mathematical modeling of the interplay between stress and anisotropic growth of avascular tumors

In this work, we propose a new mathematical framework for the study of the mutual interplay between anisotropic growth and stresses of an avascular tumor surrounded by an external medium. The mechanical response of the tumor is dictated by anisotropic growth, and reduces to that of an elastic, isotropic, and incompressible material when the latter is not taking place. Both proliferation and death of tumor cells are in turn assumed to depend on the stresses. We perform a parametric analysis in terms of key parameters representing growth anisotropy and the influence of stresses on tumor growth in order to determine how these effects affect tumor progression. We observe that tumor progression is enhanced when anisotropic growth is considered, and that mechanical stresses play a major role in limiting tumor growth

Comincrea in progress

En esta memoria se presentan los resultados del trabajo en red de investigación docente “Comincrea* in progress” de ocho docentes del máster universitario en Comunicación e Industrias Creativas de la Universidad de Alicante en su quinta edición. El objetivo principal fue la coordinación curricular y el rediseño del plan de estudios para adaptarlo a la constante realidad cambiante del ámbito de la Comunicación. Para ello se realizó un análisis del contenido de los informes de calidad semestral y anual de las cuatro ediciones previas con el fin de identificar aspectos de mejora. Adicionalmente se pretende articular actividades transversales que vertebren los contenidos formativos y permitan su integración en la práctica mediante la propuesta de creación del evento Aliméntate de la Cultura. De este último objetivo se describe el paso preliminar consistente en el diseño de un cuestionario online para detectar talentos artísticos entre la comunidad universitaria. Los resultados validan la coordinación docente y curricular como dinámica adecuada para conseguir una coordinación de contenidos óptima. Dicha coordinación consigue cambiar las formas de concebir, planificar, desarrollar y evaluar el plan de estudios además de activar sistemas de organización, relación, interactuación, diálogo e intercambio docentes que aseguren la interdisciplinariedad y la coordinación interasignaturas