169 research outputs found

    Chemotactic response of the flavonoid daidzein and its effect on the composition of the rumen bacterial community

    Get PDF
    Daidzein is one of common metabolites in plants and has chemotactic effect on soil bacteria that colonize the plants. There are several tests to assess bacterial chemotaxis, but none focused on rumen bacteria. Therefore, the aim of this study was to test the chemotactic response of the rumen microflora towards daidzein using a standardized bacterial chemotaxis assay. It consisted in a modifying capillary technique and employing technology for measuring in vitro gas production. Ruminal fluids and cellulose were used as controls. The response of bacteria to daidzein was greater than the response to cellulose, supporting the hypothesis that when fodder is chewed by the ruminant it releases daidzein which can attract rumen bacteria towards feed particles (chemotaxis) for attachment and subsequent degradation

    Hábitat sustentable II

    Get PDF
    1 archivo PDF (175 páginas)"... Los contenidos -del presente libro- fueron presentados en la segunda edición del Seminario Hábitat Sustentable con el tema “Estrategias y proyectos en diferentes ámbitos del mundo”, realizado en la ciudad de México del 4 al 6 de diciembre de 2013, organizado conjuntamente por las áreas de investigación: Arquitectura y Urbanismo Internacional del Departamento de Evaluación del Diseño en el Tiempo y Arquitectura Bioclimática del Departamento de Medio Ambiente de la Universidad Autónoma Metropolitana, Unidad Azcapotzalco, en el marco de un proyecto de investigación más amplio entre los dos departamentos. Este seminario conjuntó a importantes especialistas de distintos países, quienes compartieron públicamente sus hallazgos, experiencias, inquietudes y propuestas concretas. En este libro se presentan, en forma de artículos y algunos como relatorías de las presentaciones realizadas durante el seminario, planes y experiencias de diversas ciudades. Algunos reúnen conceptos e ideas generales producto de experiencias internacionales aceptadas como válidas; otros aportan conocimiento nuevo y visiones críticas, producto de proyectos de investigación; unos más, muestran experiencias de intervención puntuales o bien constituyen aplicaciones de conceptos, criterios y estándares en contextos específicos. En conjunto, representan una muestra pequeña, pero significativa de temas y situaciones interesantes, y constituye un aporte a la discusión actual en el campo del urbanismo y la arquitectura sustentable. El objetivo del libro es difundir productos de investigación, criterios y lineamientos de políticas urbanas sustentables desarrolladas en los últimos años, o bien estrategias y proyectos que aportan conceptos, métodos y técnicas de análisis y aplicación en casos concretos a partir del enfoque disciplinar de la arquitectura y el urbanismo sustentable. En total se presentan 15 textos, 9 en formato de artículo de autor y 6 en formato de relatoría realizadas por los editores del libro a partir del material presentado por los autores en el II Seminario de Hábitat Sustentable. Los autores, 2 de Argentina, 1 de Brasil, 1 de España, 1 de Grecia y 9 de México, abordaron situaciones y proyectos específicos ubicados en: Argentina, Brasil, Ecuador, España, Grecia y México. ...

    Hábitat sustentable

    Get PDF
    1 archivo PDF (286 páginas) : incluye ilustraciones blanco y negro y colorConsta de cuatro artículos que plantean principios y lineamientos básicos sobre temas de sustentabilidad y 13 casos que ejemplifican intervención sustentable o que abordan temas relevantes del mismo de sitios singulares en el mundo donde estas prácticas del hábitat sustentable presentan diferentes niveles de desarrollo e instauración: Norteamérica, América Latina y Europa... PALABRAS CLAVE: Sustainable architecture. Sustainable development. City planning.1. Presentación / Sergio Padilla Galicia y Víctor Fuentes Freixanet -- 2. Estrategias y proyectos sustentable en el urbanismo internacional. Experiencias del SUI / Sergio Padilla Galicia -- 3. Conceptos para ciudades sustentables, la experiencia de Albert Speer & Partner (AS&P) / Christof Göbel -- 4. El libro verde del urbanismo: la apuesta europea de sostenibilidad / Elizabeth Espinosa Dorantes -- 5. Movilidad sustentable y equitativa / Bernardo Baranda Sepúlveda y Xavier Treviño Theesz -- 6. Densidad y calidad ambiental: lo inevitable, lo deseable y lo posible / Denise Helena Silva Duarte -- 7. El clima urbano de Oporto: oportunidad para repensar la sustentabilidad del territorio y retomar los ritmos de la naturaleza / Ana Monteiro y Helena Madureira -- 8. Áreas verdes en una ciudad sustentable: el caso de Wroclaw, Polonia / Leszek Maluga -- 9. Chicago Climate Action Plan: lo verde en la ciudad / Jorge del Arenal Fenochio -- 10. Reciclamiento urbano: arte y espacio público en Seattle / Guillermo Díaz Arellano -- 11. Hacia un desarrollo urbano sustentable en la ciudad de México / Jorge Legorreta Gutiérrez -- 12. Escenarios hacia la sustentabilidad en Tepotzotlán, Estado de México / Gloria Castorena, Aníbal Figueroa y Carl Stenitz -- 13. Desarrollos urbanos integrales sustentables (DUIS c): una opción para las futuras ciudades de México / Alfonso Rivas Cruces y Eduardo Langagne Ortega -- 14. Hacia la certificación regional de la edificación sustentable / Aníbal Figueroa Castrejón, Silvia de Schiller, Jhon Martín Evans, Bruno Stagno y Susana Colmegna -- 15. Alemanía: aplicación de estándares energéticos en la arquitectura / Michael Peters y Christof Göbel -- 16. Arquitectura responsable: la sustentabilidad en Chile / Javier del Río Ojeda -- 17. Arquitectura vernácula y sustentabilidad: dos casos del sureste mexicano / Víctor Fuentes Freixanet y Olinka González Mejía -- 18. Diseño de vivienda social en México, su adaptación al cambio climático y catástrofes naturales / Dulce Romina Gómez Menéndez

    Long COVID in hospitalized and non-hospitalized patients in a large cohort in Northwest Spain, a prospective cohort study

    Full text link
    Survivors to COVID-19 have described long-term symptoms after acute disease. These signs constitute a heterogeneous group named long COVID or persistent COVID. The aim of this study is to describe persisting symptoms 6 months after COVID-19 diagnosis in a prospective cohort in the Northwest Spain. This is a prospective cohort study performed in the COHVID-GS. This cohort includes patients in clinical follow-up in a health area of 569,534 inhabitants after SARS-CoV-2/COVID-19 diagnosis. Clinical and epidemiological characteristics were collected during the follow up. A total of 248 patients completed 6 months follow-up, 176 (69.4%) required hospitalization and 29 (10.2%) of them needed critical care. At 6 months, 119 (48.0%) patients described one or more persisting symptoms. The most prevalent were: extra-thoracic symptoms (39.1%), chest symptoms (27%), dyspnoea (20.6%), and fatigue (16.1%). These symptoms were more common in hospitalized patients (52.3% vs. 38.2%) and in women (59.0% vs. 40.5%). The multivariate analysis identified COPD, women gender and tobacco consumption as risk factors for long COVID. Persisting symptoms are common after COVID-19 especially in hospitalized patients compared to outpatients (52.3% vs. 38.2%). Based on these findings, special attention and clinical follow-up after acute SARS-CoV-2 infection should be provided for hospitalized patients with previous lung diseases, tobacco consumption, and women

    Measurement of the cosmic ray spectrum above 4×10184{\times}10^{18} eV using inclined events detected with the Pierre Auger Observatory

    Full text link
    A measurement of the cosmic-ray spectrum for energies exceeding 4×10184{\times}10^{18} eV is presented, which is based on the analysis of showers with zenith angles greater than 6060^{\circ} detected with the Pierre Auger Observatory between 1 January 2004 and 31 December 2013. The measured spectrum confirms a flux suppression at the highest energies. Above 5.3×10185.3{\times}10^{18} eV, the "ankle", the flux can be described by a power law EγE^{-\gamma} with index γ=2.70±0.02(stat)±0.1(sys)\gamma=2.70 \pm 0.02 \,\text{(stat)} \pm 0.1\,\text{(sys)} followed by a smooth suppression region. For the energy (EsE_\text{s}) at which the spectral flux has fallen to one-half of its extrapolated value in the absence of suppression, we find Es=(5.12±0.25(stat)1.2+1.0(sys))×1019E_\text{s}=(5.12\pm0.25\,\text{(stat)}^{+1.0}_{-1.2}\,\text{(sys)}){\times}10^{19} eV.Comment: Replaced with published version. Added journal reference and DO

    Energy Estimation of Cosmic Rays with the Engineering Radio Array of the Pierre Auger Observatory

    Full text link
    The Auger Engineering Radio Array (AERA) is part of the Pierre Auger Observatory and is used to detect the radio emission of cosmic-ray air showers. These observations are compared to the data of the surface detector stations of the Observatory, which provide well-calibrated information on the cosmic-ray energies and arrival directions. The response of the radio stations in the 30 to 80 MHz regime has been thoroughly calibrated to enable the reconstruction of the incoming electric field. For the latter, the energy deposit per area is determined from the radio pulses at each observer position and is interpolated using a two-dimensional function that takes into account signal asymmetries due to interference between the geomagnetic and charge-excess emission components. The spatial integral over the signal distribution gives a direct measurement of the energy transferred from the primary cosmic ray into radio emission in the AERA frequency range. We measure 15.8 MeV of radiation energy for a 1 EeV air shower arriving perpendicularly to the geomagnetic field. This radiation energy -- corrected for geometrical effects -- is used as a cosmic-ray energy estimator. Performing an absolute energy calibration against the surface-detector information, we observe that this radio-energy estimator scales quadratically with the cosmic-ray energy as expected for coherent emission. We find an energy resolution of the radio reconstruction of 22% for the data set and 17% for a high-quality subset containing only events with at least five radio stations with signal.Comment: Replaced with published version. Added journal reference and DO

    Measurement of the Radiation Energy in the Radio Signal of Extensive Air Showers as a Universal Estimator of Cosmic-Ray Energy

    Full text link
    We measure the energy emitted by extensive air showers in the form of radio emission in the frequency range from 30 to 80 MHz. Exploiting the accurate energy scale of the Pierre Auger Observatory, we obtain a radiation energy of 15.8 \pm 0.7 (stat) \pm 6.7 (sys) MeV for cosmic rays with an energy of 1 EeV arriving perpendicularly to a geomagnetic field of 0.24 G, scaling quadratically with the cosmic-ray energy. A comparison with predictions from state-of-the-art first-principle calculations shows agreement with our measurement. The radiation energy provides direct access to the calorimetric energy in the electromagnetic cascade of extensive air showers. Comparison with our result thus allows the direct calibration of any cosmic-ray radio detector against the well-established energy scale of the Pierre Auger Observatory.Comment: Replaced with published version. Added journal reference and DOI. Supplemental material in the ancillary file

    First results from the AugerPrime Radio Detector

    Get PDF

    Update of the Offline Framework for AugerPrime

    Get PDF
    corecore