5,109 research outputs found
Determination of blue water footprint in forages crops from irrigation disctrict 017, Comarca Lagunera, Mexico
El objetivo de este trabajo fue la determinación de la huella hÃdrica azul en los
cultivos forrajeros del DR-017 Comarca Lagunera, México. Mediante el uso de indicadores
de productividad y eficiencia se desarrollaron modelos matemáticos que permitieron
estimar la huella hÃdrica azul de los cultivos. Los resultados muestran que los
forrajes ocuparon 45% de la superficie total agrÃcola, empleando 94,7% del agua
subterránea, generando 33% del Valor Bruto de la Producción agrÃcola. Los Ãndices de
productividad fÃsica fueron en promedio 252 L kg-1 (sorgo forrajero 181 L kg-1, avena
forrajera 413 L kg- 1, alfalfa L kg-1). El ingreso por m3 empleado fue de US 0,07 m-3, alfalfa US 0.04 m-3 on average (US 0.05 m-3 alfalfa forage). The social efficiency indicator showed in average 0.048 jobs
per hectometer (0.037 jobs hm-3 in alfalfa and 0.076 jobs hm-3 in rye grass). Finally,
under the same crop y market conditions the minimum amount for a viable operation
(break-even point) was 39.02 t ha-1. In conclusion, the production of corn and sorghum
forage in the region was highly efficient and productive compared to other forage crops
which resulted in lower blue water footprint.Fil: RÃos Flores, José Luis.
Universidad Autónoma Chapingo (México)Fil: Torres Moreno, Miriam.
México. SecretarÃa de Agricultura, GanaderÃa, Desarrollo Rural, Pesca y AlimentaciónFil: Castro Franco, Rafael.
Universidad Autónoma Chapingo (México)Fil: Torres Moreno, Marco Antonio.
Universidad Autónoma Chapingo (México)Fil: Ruiz Torres, José.
Universidad Autónoma Chapingo (México
A visual analytics architecture for the analysis and understanding of software systems
Visual analytics facilitates the creation of knowledge to interpret trends and relationships for better decision making. However, it has not being used widely for the understanding of software systems and the change process that takes place during their development and maintenance. This occurs despite the need of project managers and developers to analyze their systems to calculate the complexity, cohesion, direct, indirect and logical coupling, detect clones, defects and bad smells, and the comparison of individual revisions. This research considers the design of an extensible and scalable architecture to incorporate new and existing methods to retrieve source code from different versioning systems, to carry out the analysis of programs in different languages, to perform the calculation of software metrics and to present the results using visual representations, incorporated as Eclipse and Visual Studio extensions. Consequently, the aim of this work is to design a visual analytics architecture for the analysis and understanding of systems in different languages and its main contributions are the specification of the design and requirements of such architecture, taking as base the lessons learned in Maleku (A. González-Torres et al., 2016)
Desarrollo de nanopartÃculas magnéticas en templetes biopoliméricos
Se reporta la sÃntesis y caracterización de compósitos magnéticos preparados utilizando al biopolÃmero quitosán como matriz, para la coprecipitación in situ de nanopartÃculas de magnetita y ferrita de cobalto, con una razón en peso de nanopartÃculas/quitosán de 3. Los compósitos fueron caracterizados mediante difracción de rayos X, microscopÃa electrónica de transmisión y magnetometrÃa; encontrando que las nanopartÃculas presentan tamaños de aproximadamente 5 nm con distribución estrecha. Las caracterÃsticas magnéticas muestran que las nanopartÃculas son de un solo dominio magnético, siendo su respuesta de magnetización altamente dependiente de: sus dimensiones, temperatura y de las interacciones inter e intrapartÃculas
Two short mass-loss events that unveil the binary heart of Minkowski's Butterfly Nebula
Studying the appearance and properties of bipolar winds is critical to
understand the stellar evolution from the AGB to the planetary nebula (PN)
phase. Many uncertainties exist regarding the presence and role of binary
stellar systems, mainly due to the deficit of conclusive observational
evidences. We investigate the extended equatorial distribution around the early
bipolar planetary nebula M 2-9 ("Minkowski's Butterfly Nebula") to gather new
information on the mechanism of the axial ejections. Interferometric millimeter
observations of molecular emission provide the most comprehensive view of the
equatorial mass distribution and kinematics in early PNe. Here we present
subarcsecond angular-resolution observations of the 12CO J=2-1 line and
continuum emission with the Plateau de Bure interferometer. The data reveal two
ring-shaped and eccentric structures at the equatorial basis of the two coaxial
optical lobes. The two rings were formed during short mass-loss episodes (~ 40
yr), separated by ~ 500 yr. Their positional and dynamical imprints provide
evidence of the presence of a binary stellar system at the center, which yields
critical information on its orbital characteristics, including a mass estimate
for the secondary of ~< 0.2 \ms. The presence of a stellar system with a
modest-mass companion at the center of such an elongated bipolar PN strongly
supports the binary-based models, because these are more easily able to explain
the frequent axisymmetric ejections in PNe.Comment: 8 page
First histopathological study in kidneys of rodents naturally infected with Leptospira pathogenic species from Yucatan, Mexico
AbstractObjectiveTo report the renal histological lesions in synanthropic rodents, Mus musculus and Rattus rattus, naturally infected with Leptospira spp., captured in a rural community in Yucatan, Mexico.MethodsKidney samples of synanthropic rodents were collected from a rural community in Yucatan, Mexico. Polymerase chain reaction was used to detect Leptospira spp. infection. Tissue kidney was fixed in 10% buffered formalin, processed according to the usual techniques for paraffin inclusion, cut and stained with hematoxylin and eosin, and examined using a conventional electronic microscope.ResultsA total of 187 rodents were captured. Nine individuals (4.8%) were positive for Leptospira spp. in the molecular analysis. All renal lesions observed in the histopathological study had been reported previously for Leptospira spp. infection.ConclusionsThe histopathological lesions are present in the kidneys, plus the results of the polymerase chain reaction confirm that these rodents are true carriers of Leptospira spp
Determinación de la huella hÃdrica azul en los cultivos forrajeros del DR-017, Comarca Lagunera, México
The aim of this work was the determination of the blue water footprint in forage crops from DR-017 "Comarca Lagunera", México. By means of productivity and efficiency mathematical models were used to estimate the blue water footprint of forages crops. The results show that forages occupied 45% of the total agricultural area using 94,7% of groundwater, generating 33% of the Gross Value Production. Physical productivity rates were on average 252 L kg-1 (forage sorghum 181 L kg-1, forage oats 413 L kg-1 alfalfa L kg- 1). Income per m3 was US 0.94 m-3 in forage maize, US 0.05 m-3 alfalfa forage). The social efficiency indicator showed in average 0.048 jobs per hectometer (0.037 jobs hm-3 in alfalfa and 0.076 jobs hm-3 in rye grass). Finally, under the same crop y market conditions the minimum amount for a viable operation (break-even point) was 39.02 t ha-1. In conclusion, the production of corn and sorghum forage in the region was highly efficient and productive compared to other forage crops which resulted in lower blue water footprint.
El objetivo de este trabajo fue la determinación de la huella hÃdrica azul en los cultivos forrajeros del DR-017 Comarca Lagunera, México. Mediante el uso de indicadores de productividad y eficiencia se desarrollaron modelos matemáticos que permitieron estimar la huella hÃdrica azul de los cultivos. Los resultados muestran que los forrajes ocuparon 45% de la superficie total agrÃcola, empleando 94,7% del agua subterránea, generando 33% del Valor Bruto de la Producción agrÃcola. Los Ãndices de productividad fÃsica fueron en promedio 252 L kg-1 (sorgo forrajero 181 L kg-1, avena forrajera 413 L kg- 1, alfalfa L kg-1). El ingreso por m3 empleado fue de US 0,04 m-3 en promedio (maÃz forrajero US 0,05 m-3). El indicador de eficiencia social mostró que en promedio se generaron 0,048 empleos hm-3 (0,037empleos hm-3 en alfalfa y 0,076 empleos hm-3 en rye grass). Finalmente bajo las mismas condiciones de cultivo, asà como de mercado, la cantidad mÃnima que se requiere producir para tener una operación viable (punto de equilibrio) en promedio fue 39,02 t ha-1. En conclusión, la producción de maÃz y sorgo forrajero en la región resultó altamente eficiente y productiva en comparación con los demás cultivos forrajeros lo que se tradujo en una menor huella hÃdrica azul
Estudio histopatológico de tejido cardiaco de roedores infectados con Trypanosoma cruzi capturados en barrios suburbanos de Mérida, México
Introduction: Trypanosoma cruzi is the causal agent of the American trypanosomiasis, an endemic disease in México. The commensal rodents Mus musculus and Rattus rattus are reservoirs of this parasite, which invades cardiac fibers and develops parasite nests causing various lesions. Histopathological studies in naturally infected rodents are scarce.Objective: To describe the types and frequencies of microscopic lesions in cardiac tissue of M. musculus and R. rattus infected with T. cruzi captured in Mérida, México.Materials and methods: The rodents were captured in suburban environments of Mérida. Cardiac tissue was extracted and processed by the paraffin inclusion technique and hematoxylin and eosin stained. The observation was made with a conventional microscope and all the lesions, as well as their degree, were identified.Results: Eight tissue samples of M. musculus and seven of R. rattus were studied. Parasite nests were found in 7/15, specifically 3/8 in M. musculus and 4/7 in R. rattus. The inflammatory infiltrate was the most frequent lesion. Other lesions were: Degeneration of cardiac fibers (8/15), congestion of blood vessels (6/15), and necrosis (5/15).Discussion: The lesions we observed have been described in experimental animal models and in humans with American trypanosomiasis. The inflammatory infiltrate has been identified as the most significant lesion in humans and reservoirs in the chronic stage of the disease.Conclusion: The lesions we described are associated with T. cruzi infection, which confirms that the rodents studied are reservoirs of this parasite.Introducción. Trypanosoma cruzi es el agente causal de la tripanosomiasis americana, enfermedad endémica en México. Los roedores Mus musculus y Rattus rattus son reservorios del parásito, el cual invade las fibras cardiacas y desarrolla nidos parasitarios produciendo diversas lesiones. Los estudios histopatológicos en roedores naturalmente infectados son escasos.Objetivo. Describir los tipos y las frecuencias de las lesiones microscópicas en muestras de tejido cardiaco de M. musculus y R. rattus infectados con T. cruzi capturados en Mérida, México.Materiales y métodos. Los roedores se capturaron en los barrios suburbanos de Mérida. Se extrajo el tejido cardiaco y se procesó por la técnica de inclusión en parafina y tinción con hematoxilina y eosina. Su examen se hizo con un microscópico convencional y se determinaron todas las lesiones y su grado de afección.Resultados. Se trabajaron ocho muestras de tejido de M. musculus y siete de R. rattus. Se encontraron nidos parasitarios en siete del total de las muestras: en 3 de las 8 de M. musculus y en 4 de las 7 de R. rattus. Se observaron infiltrados inflamatorios en todas las muestras. Otras lesiones fueron la degeneración de las fibras cardiacas (8/15), la congestión de los vasos sanguÃneos (6/15) y la necrosis (5/15).Discusión. Las lesiones observadas están descritas en los modelos animales experimentales y en los humanos con tripanosomiasis americana. Los infiltrados inflamatorios se han descrito como la lesión más significativa en los humanos y en los reservorios en la etapa crónica de la enfermedad.Conclusión. Las lesiones observadas están asociadas con la infección con T. cruzi, lo cual confirma que los roedores estudiados son reservorios de este parásito
Anomalous origin of the left coronary artery with origin in the right coronary artery from a single coronary ostium associated with multivessel coronary artery disease: case report and literature review
The anomalous origin of the coronary arteries is a group of rare congenital heart conditions in which there has been an increase in its diagnosis thanks to more accessible and less invasive imaging techniques such as coronary angiotomography, which allows visualization of the arteries in its entire path in a short exploration interval, with adequate spatial and temporal resolution. The clinical presentation is variable, up to 80% are asymptomatic and the remaining 20% may present arrhythmias, myocardial infarction, heart failure and sudden death. We present the case of a patient with unstable angina in whom an anomalous origin of the left coronary artery (LCA) with origin in the right coronary artery (RCA) from a single coronary ostium associated with multivessel coronary artery disease was diagnosed
VARIABILIDAD GENÉTICA EN ADN MICROSATÉLITE DE UN NUEVO LINAJE DE OSTIÓN (Crassostrea gigas) EN SONORA
Se evaluó la variabilidad genética en seis loci microsatelitales de dos generaciones consecutivas de un nuevo linaje de Crassostrea gigas que se pretende establecer en los cultivos del Golfo de California. Se detectaron un total de 66 alelos y 146 genotipos en la muestra del conjunto parental y 68 alelos y 168 genotipos en la muestra de la generación F1. El promedio de la heterocigosis observada fue de 0,65 para la generación parental y de 0,67 para la F1, sin diferencias significativas entre ellas. Todos los loci mostraron una deficiencia de heterocigotos con excepción de ucdCg10 en la F1, pero no se encontró evidencia de una endogamia acumulada. Se encontraron diferencias en la distribuciones de las frecuencias alélicas y genotÃpicas de cinco loci. El monitoreo de la variabilidad genética de organismos provenientes de laboratorios de producción no es un análisis de rutina en el proceso del control de calidad en la mayorÃa de los laboratorios. El análisis de microsatélites es una buena herramienta para vigilar las fluctuaciones de la heterocigosis a lo largo de la vida productiva de los linajes de cultivo
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