The Pan American (1995-04-06)

https://scholarworks.utrgv.edu/panamerican/1293/thumbnail.jp

HOST PLANT RESISTANCE IN STRAWBERRIES TO ANTHRACNOSE AND COLONIZATION OF CROWN AND ROOT TISSUE BY VERTICILLIUM DAHLIAE AND MACROPHOMINA PHASEOLINA

Strawberries are considered an important crop in California where in 2018 it was in the top 5 valued fruit and vegetable commodities valued at $2.84 billion accounting for 88% of the total U.S. production. Strawberry production can be severely impacted by soilborne pathogens that can affect strawberry roots, crowns and leaves which can result in plant mortality. As much as 50 to 60% mortality can occur in one field. Pathogens responsible for such losses include Colletotrichum acutatum (syn.C. nymphaeae), Macrophomina phaseolina and Verticillium dahliae. With the phaseout of methyl bromide, host resistance and an understanding of host-pathogen interactions can play an important role in control of these diseases. A two-year study was conducted in order to evaluate host resistance of anthracnose in 105 cultivars and elite breeding lines developed by six strawberry breeding programs. Cultivars and elite breeding lines were inoculated using three local isolates in both years. All breeding programs provided genotypes that had a wide range of anthracnose susceptibility ranging from 0 to 100% mortality during both years. In both years an average of 78% of all the plant mortality occurred by 1 January. From the 105 cultivars and elite breeding lines, 30 cultivars were common to both years. Of these 30 cultivars, nine of them differed in their disease susceptibility between experiments by more than 20%. This suggests that several years of field evaluation may be necessary to determine susceptibility to anthracnose. Popular cultivars that represent the spectrum of susceptibility are Monterey (susceptible), Festival (moderately resistant), and Sensation (resistant). A second study was conducted toevaluate pathogen colonization of resistant and susceptible strawberry cultivars, testing interactions among crown and root plant tissue and two sampling timings. These cultivars were challenged with two soilborne pathogens, Macrophomina phaseolinaand Verticillium dahliae,over two years. Existing qPCR protocols for M. phaseolina and V. dahliae were used in order to quantify how much pathogen DNA was detected in crown and root samples. For the 2016-2017 V. dahliae trial there were significant effects for cultivar. Cultivar Benicia had significantly higher pathogen DNA compared to resistant cultivars Marquis, UC-12 and Camino Real. Susceptible cultivar BG 1975 had significantly less pathogen DNA compared to resistant cultivars San Andreas and Petaluma. In the 2017-2018 V. dahliaetrial pathogen DNA amount was not significantly different based on cultivar, plant part colonization, or the sampling period. In the 2017-2018 M. phaseolina trial all three of the fixed factors, cultivars, plant part colonization and sampling period were statistically significant. Cultivar ‘Sweet Ann’ had a significantly higher level of M. phaseolinaDNA in the early vs. the late sampling

Book Review of John Rechy's After the Blue Hour

Omar Gonzalez provides a brief book review of gay Chicano novelist John Rechy’s latest book After the Blue Hour. Gonzalez’s review, “The Nepantla of John Rechy,” delivers an overview of the breadth of work by Rechy.Through a Nepantla framework, Gonzalez suggests that Rechy’s latest piece of literature not only problematizes the themes of erotic desire and domination but also establishes itself as yet another important contribution for gay Chi- canx literature

Gigant Transethmoidal Meningoencephalocele Operated by Full Endonasal Endoscopic Approach: Case Report

Intranasal meningoencephaloceles have historically been managed by neurosurgeons, although their main clinical manifestations are rhinological. Recent advances in endoscopic skull base surgery has significantly improved the treatment of these lesions and consequently diminished appreciable surgical morbidity. We report an ethmoidal meningoencephalocele case operated on by endonasal endoscopic approach for removal of the lesion and reconstructing the associated skull base. From this experience, we conclude that removal of the lesion and watertight closure of the skull base irrespective of the size of the mass and anterior skull base defect are the operation's most important aspects

Electrochemical Properties of Al2O3-Fe/Si Composites Prepared by High-Energy Mechanical Milling

open accessThe growing demand in the manufacture of advanced materials with desired and unique properties (e.g. high mechanical strength, durability, good corrosion resistance and low cost of maintenance/replacing) is one of reasons to motivate the researchers to pay special attention in Ceramics as high performance materials for industrial applications. This is because conventional materials cannot meet the engineering requirements during their service that is why the need for advanced ceramic materials to achieve these industrial requirements. In the present work a study was made on Al2O3-matrix ceramic composites reinforced with 2%wt. or 5% wt. of Fe/Si particulates that were produced using a mechanical ball milling at high-energy condition. The electrochemical behavior of these ceramics was investigated by anodic polarization and Electrochemical Impedance Spectroscopy (EIS) measurements in a solution containing 0.5N NaCl, whereas the morphology and microstructural features were examined by optical or Scanning Electron Microscopy (SEM)

Dendritic and linear polymers for separations

Most new fields in chemistry usually began as a curiosity by the researchers, followed by an intrinsic interest in basic biological, physical and chemical properties of reactions, interactions, structural features, and response to external stimuli by chemical elements and/or chemical compounds. If the curiosity has appealing bio-physico-chemical properties this trend is followed by studies on the possible applications of such new fields. As a result, is it expected that these curiosities develop or give insights into new technologies. The development of the field of dendrimer chemistry is no different. In fact, dendrimer chemistry illustrates this trend fittingly. The research in this dissertation follows a similar trend. First, the synthesis of a melamine-based dendrimer is achieved. The synthesis illustrates the concept of using triazines as building blocks in dendrimer synthesis. The characterization of this molecule was followed by a basic inquiry of the properties that were unique relative to its composition. This dendrimer is compared against a small library of similar dendrimers in a structure-activity relationship (SAR) study. From the basic concept of an SAR, we moved toward more applied studies of these molecules. The grafting of organic molecules onto inorganic supports has had influences in the fields of catalysis, separations, and sensors. We developed protocols for the grafting of melamine-based molecules onto hydroxyl rich surfaces. After extensive characterization using solution and surface analyses, we tested the sequestration abilities of these new materials toward the separation of molecules of environmental importance from water. Following the data collected in these experiments, we moved toward a different type of applied technology. The use of linear polymers for separations instead of dendrimers is more attractive from an engineering perspective. We then used what was learned from the study of the separations performed by dendrimers and applied it to the design of linear polymers. We take advantage of a latent solid phase response to external stimuli to remove the herbicide atrazine from aqueous solution to the limit of detection

Sistema CPHODE (Control de Pacientes Hipertensos, Oxigeno-Dependientes, Diabéticos y Embarazos) IMSS

Hasta hace un par de décadas en el IMSS se utilizaban sistemas tradicionales, en los que los documentos en papel eran almacenados en archivadores utilizados para mantener los documentos organizados y donde los empleados podían encontrarlos “fácilmente”, esto claro si el empleado mantenía una buena organización y clasificación de estos. Derivado de lo anterior en el año 2009 en el IMSS fue desarrollado e implantado un sistema informático llamado SIMF (Sistema de Información de Medicina Familiar) que es el Expediente Clínico Electrónico dentro del Instituto y que es la piedra angular dentro de las Unidades de Medicina Familiar (UMF) para recolectar, almacenar y utilizar la información generada en la unidad durante el proceso de atención médica y así integrarla en el expediente electrónico del paciente, proporcionándole así al médico una herramienta eficaz. Sin embargo, esto no ha sido suficiente ya que siguen existiendo controles que se llevan de manera manual. Uno de estos es el que se lleva para dar seguimiento a pacientes Hipertensos, Oxigeno-dependientes, Diabéticos y mujeres embarazadas, el cual lo llevan mis compañeras Asistentes Medicas de una manera manual. Aunque en el SIMF se encuentran este tipo de pacientes no hay una manera concreta de consultarlos y generar un reporte de si asistió o no a su cita y así darle el seguimiento y tratamiento adecuado. Partiendo de esa problemáticas es así que se desarrolló el sistema CPHODE el cual viene a distinguir este tipo de padecimientos y cuyo objetivo principal es el ahorrar recursos y tiempo

Organic production of leek (Allium porrum L.) seeds in the Northeast of the Province of Buenos Aires, 2: Phenology, yield and quality

The aim of this work was to determine whether the local agroecological conditions of the northeast of the Province of Buenos Aires (33 deg 41 min S, 59 deg 41 min W) permit the organic production of leek (cv. Monstruoso de Carentan) seeds. In the 2000/01, 2001/02 and 2002/03 growth seasons, percentage flowering and seed yield (g m-2) and quality were recorded, the latter by determining the thousand grain weight and germination capacity. In the 2001/02 and 2002/3 seasons, the phenological stages of the crop were also determined, as well as the number of hours of cold temperatures experienced and the number of degree days. Significant differences between years were found in the number of days from 50% fruit setting to harvest, probably because three harvests were collected during the first season whereas only one was collected during the second and third. A total of 1,116 and 1,019 hours of cold temperatures and 925 and 1,127 degree days were recorded for 2001/2 and 2002/3 respectively. There were no significant differences between years for yield, percentage flowering or thousand seed weight (average values 78.53 gm-2, 93.36% and 3.55 g respectively). Differences in germination capacity were recorded, but Argentine legislative requirements were always surpassed. Seed yield and quality were comparable to figures cited in the literature. In conclusion, the agroecological conditions of the northeast of the Province of Buenos Aires allow the normal, organic cultivation of this leek cultivar for seed.El objetivo de este estudio fue determinar si las condiciones agroecológicas locales (33º41’ L.S.; 59º 41’ L.O.) permiten satisfacer los requerimientos fisiológicos de la producción de semillas de puerro, cultivado según las normas de la agricultura orgánica. Durante las campañas 2000/01, 2001/02 y 2002/03 se determinaron los porcentajes de floración; los rendimientos de semillas en g m-2 y la calidad, a través del peso de mil semillas y la germinación. En las campañas 2001/02 y 2002/03 se determinaron las etapas fenológicas, las horas de frío y los días grado. No se registraron diferencias estadísticas significativas (α = 0,05) entre años en la mayoría de las etapas fenológicas evaluadas. Existieron diferencias entre el 50% de cuaje y la cosecha, probablemente porque durante el primer año se realizaron tres cosechas, mientras que durante el segundo año se efectuó una sola. Se registraron 1.016 y 1.019 horas de frío y 925 y 1.127 días grado, durante las campañas 2001/02 y 2002/03, respectivamente. Los rendimientos (78,53 g m-2), porcentajes de floración (93,36%) y peso de semillas (3,55 g), no arrojaron diferencias estadísticas en tres años de medición. El poder germinativo tuvo diferencias entre años, aunque siempre superando los requerimientos de la legislación argentina. El rendimiento y la calidad de la semilla obtenidos son comparables a los citados en la bibliografía disponible. Las condiciones agroecológicas del noreste de Buenos Aires permiten el desarrollo normal del cultivo de puerro (cv. Monstruoso de Carentan) para la producción de semillas, cultivado según las normas de la agricultura orgánica.EEA San PedroFil: Paunero, Ignacio Eugenio. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Pedro; ArgentinaFil: Bazzigalupi, Omar. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino; ArgentinaFil: González, Joaquín. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Pedro; ArgentinaFil: Uviedo, Raúl Héctor. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Pedro; Argentin

Changes in Teaching During the Covid-19 Pandemic

During the confinement derived from the Covid-19 pandemic, many aspects of life changed; including, formal and informal economic activities were suspended. However, education could not be stopped, and for this reason, teachers found themselves in need of including ICT as part of their teaching strategies; seeing themselves in the obligation to modify their training practices. This paper analyzes the changes in teacher training during the confinement due to the pandemic. For this, a survey was made to teachers of the University Center of the Valleys of the University of Guadalajara, in order to rescue their experiences when training during this period. It would seem that the virtual training that was beginning to emerge, and was not yet very well accepted, came to satisfy or complement the learning needs, including disciplinary update courses, which were taught using technologies such as ClassRoom©, Youtube® transmissions, videoconferences via Meet© and Zoom®, which opened a wide panorama in terms of teacher training

Elaboración de unidades de albañilería cocida, con sustitución de lodo deshidratado procedente de la planta de tratamiento de agua potable, Trujillo - 2020

El presente trabajo de busca recopilar información de trabajos de investigación donde se sustituyan porcentajes de lodos deshidratados provenientes de plantas de tratamiento de agua potable de las ciudades por arcilla para la elaboración de unidades de albañilería disponibles en bibliotecas virtuales. En el presente trabajo se buscó, revisó y analizó la información disponible en bibliotecas virtuales donde se analizara las características de los lodos deshidratados y sus resultados obtenidos por los investigadores para ser comparados con las especificaciones técnicas establecidas en la norma E-070 de albañilería del 2006. Luego del análisis de resultados obtenidos en los trabajos de investigación por diferentes autores se evidencia que la sustitución de lodos deshidratados hasta el 15% por arcilla supera lo establecido en la Norma E 070 de albañilería 2006 (4.9 Mpa o 50 kg/cm2). En el presente trabajo se concluye que diferentes investigadores encontraron en los lodos deshidratados se encontró presencia de cuarzos, bajo nivel de caolinita y una sustitución de hasta el 15% por arcilla superan lo establecido en la Norma E 070 de albañilería 2006 (4.9 Mpa o 50 kg/cm2)