Commitment in University Students: Generator of Successful Professionals

The University has historically been regarded as the harbinger of values, human rights, and other noble pursuits. It is within this atmosphere that personal development, mutual respect, and collaboration are expected to flourish through commitment to work and study. Yet in order for meaningful and sustainable social, economic, and political changes to take root, the author opines that certain adjustments to the overall social fabric are occasionally required and can only be achieved through unyielding commitment — an essential value transmitted from person to person through both individual and collective reflection

Commitment in University Students: Generator of Successful Professionals

The University has historically been regarded as the harbinger of values, human rights, and other noble pursuits. It is within this atmosphere that personal development, mutual respect, and collaboration are expected to flourish through commitment to work and study. Yet in order for meaningful and sustainable social, economic, and political changes to take root, the author opines that certain adjustments to the overall social fabric are occasionally required and can only be achieved through unyielding commitment — an essential value transmitted from person to person through both individual and collective reflection

Distinctive dielectric properties of nematic liquid crystal dimers

We provide an overview of the effect of the molecular structure on the dielectric properties of dimers exhibiting nematic and twist-bend nematic phases with special focus on how the conformational distribution changes are reflected by the dielectric behaviour. Nematic dimers show distinctive dielectric properties which differ from those of archetypical nematic liquid crystals, as for example, unusual temperature dependence of the static permittivity or dielectric spectra characterised by two low-frequency relaxation processes with correlated strengths. The interpretation of such characteristic behaviour requires that account is taken of the effect of molecular flexibility on the energetically favoured molecular shapes. The anisotropic nematic interactions greatly influence the conformational distribution. Dielectric behaviour can be used to track those conformational changes due to dependence of the averaged molecular dipole moment on the averaged molecular shape. Results for a number of dimers are compared and analysed on the basis of the influence of details of the molecular structure, using a recently developed theory for the dielectric properties of dimers.Postprint (author's final draft

GC-FID-MS and X-ray Diffraction for the Detailed Evaluation of the Volatiles From Senecio filaginoides

The medicinal aromatic plant Senecio filaginoides DC, which is very widespread in the Patagonia region, was harvested at the vegetative, flowering, and fructification stages. The materials were extracted by hydrodistillation, yielding in average 0.34% v/w of essential oils with a pleasant sweet and greenish scent. A total of 56 components were identified by gas chromatography using flame ionization detection and mass spectra measurements, representing 96.1%-97.6% of the total oil. The sesquiterpenoid 10αH-furanoeremophil-1-one (1) appeared as a major constituent (16.2%-26.9%) of the oil. It could be isolated by cooling the oil at 4°C, thus yielding yellow crystalline solids. Its stereochemistry was assigned by single-crystal X-ray diffraction since previous studies identified the compound with different stereochemistries. The use of classical separation and analytical methodologies remains as a very useful strategy for the correct identification of compounds present in the volatile fraction of a plant and is a route for potential industrial applications.Fil: Van Baren, Catalina Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Metabolismo del Fármaco. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Metabolismo del Fármaco; ArgentinaFil: González, Silvia Beatriz. Universidad Nacional de la Patagonia "San Juan Bosco"; ArgentinaFil: Bandoni, Arnaldo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Metabolismo del Fármaco. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Metabolismo del Fármaco; ArgentinaFil: Di Leo Lira, Paola Maria del Rosario. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Química y Metabolismo del Fármaco. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Instituto de Química y Metabolismo del Fármaco; ArgentinaFil: Bucio, María A.. Instituto Politécnico Nacional. Centro de Investigación y de Estudios Avanzados. Departamento de Investigaciones Educativas.; MéxicoFil: Hernández Barragán, Angelina. Instituto Politécnico Nacional. Centro de Investigación y de Estudios Avanzados. Departamento de Investigaciones Educativas.; MéxicoFil: Joseph Nathan, Pedro. Instituto Politécnico Nacional. Centro de Investigación y de Estudios Avanzados. Departamento de Investigaciones Educativas.; Méxic

Morphological and molecular characterization of Trichuris muris (Nematoda: Trichuridae): studies from two commensal rodent species

In this paper we re-describe Trichuris muris based on morphological data following isolation from two commensal rodent species, Mus musculus from Mexico and Rattus rattus from Argentina. Furthermore, we provide a molecular characterization based on mitochondrial (cytochrome c oxidase subunit 1 mitochondrial gene) and nuclear (internal transcribed spacer 2 region) markers in order to support the taxonomic identification of the studied specimens of T. muris from M. musculus. We distinguished T. muris from 29 species of Trichuris found in American rodents based on morphological and biometrical features, such as the presence of a spicular tube, length of spicule, size of proximal and distal cloacal tube and non-protrusive vulva. We suggest that spicular tube patterns can be used to classify Trichuris species in three groups. Considering that the diagnosis among the species of this genus is mainly based on morphometry, this proposal represents a relevant contribution. We provide molecular studies on two markers, making this the first contribution for T. muris in the Americas. This study makes an important contribution to the integrative taxonomy of cosmopolitan nematode species, and its correct determination from the parasitological study of commensal rodents.Fil: Panti May, Jesús Alonso. Universidad Autonoma de Yucatan (uady);Fil: Gómez Muñoz, María de Los Ángeles. Universidad Nacional del Nordeste; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Yeh Gorocica, A. B.. Universidad Autonoma de Yucatan (uady);Fil: Hernández Betancourt, S.. Universidad Autonoma de Yucatan (uady);Fil: Milano, F.. Universidad Nacional del Nordeste; ArgentinaFil: Galliari, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; ArgentinaFil: Robles, Maria del Rosario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; Argentin

Evaluación del estado nutricional de niños en edad escolar de dos localidades indígenas de Oaxaca

Introducción: La malnutrición es un problema grave en la edad escolar y se polariza en excesos o carencias que pueden perjudicar física, psicológica y fisiológicamente la salud de los niños a corto y largo plazo. Objetivo: Conocer el estado nutricional de escolares de dos localidades indígenas de Oaxaca. Método: Se realizó un estudio transversal observacional en 120 niños escolares de 6 a 12 años de las localidades de Progreso Guevea y Xadani Guevea de Humboldt, Oaxaca. Se obtuvo el peso y la talla. El estado nutricio se determinó a través del puntaje z del IMC para la edad y talla para la edad en STATA V. 14. El análisis de los datos se realizó por medio de frecuencias, porcentajes, diferencias de medias y pruebas de Chi-cuadrada,T de Student y U deMann-Whitney en SPSS V. 24. Resultados: De los 120 niños analizados se obtuvo una prevalencia de sobrepeso y obesidad de 15% y de desnutrición de 16.7%. Se encontraron diferencias significativas de desnutrición entre localidades (p=0.02) y entre alumnos de menor y mayor grado (p=0.00). Se observó mayor proporción de niñas con obesidad. Conclusiones: La doble carga de desnutrición, sobrepeso y obesidad sigue permeando diferentes zonas indígenas del país mostrándose en similitud de proporciones, considerándose aún un problema de salud pública mundial

Population Characteristics of Rattus rattus and Mus musculus present in rural communities in Yucatán, México

The aim of this study was to describe the abundance, weight and body length structures, and reproductive and health status of the black rat Rattus rattus and the house mouse Mus musculus from Yucatán, México. Rodents were trapped from May to September 2016 in rural households in the communities Xkalakdzonot (XKA) and Paraíso (PAR). A total of 236 M. musculus and 127 R. rattus were trapped over 3880 trap-nights. In XKA, R. rattus was more abundant than M. musculus, whereas in PAR, M. musculus was notably dominant over R. rattus. The sex ratio was 1:1 in both rodent species. Rattus rattus in classes 40.1?80 g and 120?139 mm were more abundant, whereas M. musculus in classes 8.1?12 g and 70?79 mm were more abundant. Mus musculus had similar weight, body length and reproductive and health parameters between communities. The majority of specimens of trapped rodents had a good body condition and few individuals had wounds. The information generated in this study is basic for understanding the ecology of commensal rodents, the dynamics of rodent-associated zoonosis transmission, and to design of integrated control programs for rodents.Fil: Panti May, Jesús Alonso. Universidad Autonoma de Yucatan; MéxicoFil: Gurubel González, Yessica M.. Universidad Autonoma de Yucatan; MéxicoFil: Palomo Arjona, Eduardo E.. Universidad Autonoma de Yucatan; MéxicoFil: Cetina Trejo, Rosy C.. Universidad Autonoma de Yucatan; MéxicoFil: Machain Williams, Carlos. Universidad Autonoma de Yucatan; MéxicoFil: Robles, Maria del Rosario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; ArgentinaFil: Hernández Betancourt, Silvia F.. Universidad Autonoma de Yucatan; Méxic

El género Daldinia (Sordariomycetes, Ascomycota) en México

Background and Aims: The genus Daldinia, with 48 species worldwide, is characterized by perithecia immersed in globose to claviform stromata, which are cupper, violet, wine, brown to black coloured; releasing ochraceous, purple, greenish and gray pigments in KOH. It is characterized by cylindrical stipitate ascii with an apical amyloid pore, and ellipsoid, brown, smooth or ornamented ascospores. The asexual state was described in the genus Nodulisporium. It is now known that the group is mainly endophytic. The objective of the present study is to carry out a taxonomic revision of the genus Daldinia in Mexico, based on macro- and micromorphological characters and the observation of the spores with a SEM to identify the species.Methods: The specimens were studied, described and determined according to the traditional techniques in mycology. In addition, the spores were observed with a scanning electron microscope. The material is deposited in the fungus collection of the ENCB herbarium.Key results: Fourteen species of Daldinia were identified in Mexico, of which D. decipiens, D. cuprea, D. petriniae and D. rehmii are cited for the first time for the country. The species of this genus were mainly associated with the tropical dry forest. Daldinia childiae, D. eschscholtzii and D. vernicosa are the species with major distribution in the national territory.Conclusions: The genus Daldinia is well represented in Mexico, being one of the best studied of the family Hypoxylaceae. The group has a remarkable tropicaldistribution with more than 80% of the species located in tropical dry forest. It has a restricted distribution in temperate regions, as well as a greater specificity for the host, mainly Alnus and Quercus. The state of Oaxaca is the most species-rich entity.Resumen:Antecedentes y Objetivos: El género Daldinia, con 48 especies a nivel mundial, se caracteriza por presentar peritecios inmersos en estromas globosos a clavados de colores cobrizos, violáceos, vináceos, marrones a negros, liberando pigmentos de colores ocráceos, púrpuras, verdosos y grisáceos en KOH. Está caracterizado por ascas cilíndricas estipitadas con poro apical amiloide, y ascosporas elipsoidales marrones lisas u ornamentadas. El estado asexual fue descrito en el género Nodulisporium. Actualmente, se sabe que el grupo es principalmente endófito. El objetivo del presente estudio fue realizar una revisión taxonómica del género Daldinia en México, basada en caracteres macro y micromorfológicos y la observación de las esporas al MEB para identificar a las especies.Métodos: Los ejemplares fueron estudiados, descritos y determinados de acuerdo con las técnicas tradicionales en micología. Adicionalmente, las esporas se observaron al microscopio electrónico de barrido. El material está depositado en la colección de hongos del herbario ENCB.Resultados clave: Se determinaron 14 especies de Daldinia en México; de éstas, D. decipiens, D. cuprea, D. petriniae y D. rehmii se citan por primera vez para el país. De acuerdo con el hábitat, las especies de este género se asociaron principalmente al bosque tropical caducifolio. Daldinia childiae, D. eschscholtzii y D. vernicosa son las especies con mejor distribución en el territorio nacional.Conclusiones: El género Daldinia se encuentra bien representado en México, siendo uno de los mejor estudiados de la familia Hypoxylaceae. El género tiene una distribución principalmente tropical, con más de 80% de las especies descritas. En regiones templadas su distribución es restringida y manifiesta una mayor especificidad por el hospedero, principalmente Alnus y Quercus. El estado de Oaxaca fue la entidad con mayor riqueza de especies.