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Search Results: 1 - 10 of 3214 matches for " Vinicio Macías-Zamora "
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Winter and Summer Evaluation of Bacteriological Water Quality at Recreational Beaches along Todos Santos Bay, Baja California, Mexico  [PDF]
María Victoria Orozco-Borbón, Efraín A. Gutiérrez-Galindo, Luis. F. Navarro-Olache, Vinicio Macías-Zamora, Celia Pérez-Capetillo, Albino Mu?oz-Barbosa
Advances in Microbiology (AiM) , 2014, DOI: 10.4236/aim.2014.415123
Abstract: Water bacteriological qualities of 22 recreational beaches in Ensenada Bay, Baja California, Mexico were analyzed during the summer and winter of 2008. Total and fecal coliforms as well as enterococci bacteria were used as pollution indicators. Results showed that bacteria concentrations were higher in winter than summer, associated with Southern California rainy season. Bacteria loads in winter exceeded both the daily and monthly standards showing a clear effect of storm water runoff in the quality of Todos Santos Bay recreational beaches. Statistical analysis showed significant differences between bacteria concentration during summer and winter. The general behavior of the indicators based on daily and monthly standards from high to low was enterococci > FC > TC> total/fecal ratio. Water discharged from 3 sewage treatment plants were responsible for the pollution observed at stations, when the uptake capacity of plants exceeded the storage. During summer pollution was due to non-programmed discharges from sewage treatment plants.
Modelo espacialmente explícito de la migración estacional del pez vela (Istiophorus platypterus) en el Pacífico mexicano Spatial explicit model for seasonal migration of sailfish (Istiophorus platypterus) in the Mexican Pacific
René Macías-Zamora,Aramis Olivos-Ortiz,Ana Luisa Vidaurri-Sotelo,Miguel ángel Carrasco-águila
Hidrobiológica , 2011,
Abstract: Utilizando los datos de captura y esfuerzo registrados en la pesca deportiva realizada en los puertos de Mazatlán, Sinaloa y Buena Vista, Baja California Sur, México, durante los periodos 1979-2005 y 1985-2006 respectivamente, se construyó un a o "tipo" o promedio, y se elaboró un modelo espacial determinístico en tiempo discreto para simular los movimientos masivos estacionales que realiza el pez vela (Istiophorus platypterus) en la Zona Económica Exclusiva del Pacífico mexicano. Los parámetros del modelo fueron los índices de migración, que definen los movimientos, los cuales se estimaron minimizando las diferencias al cuadrado entre lo pronosticado por el modelo y la captura por unidad de esfuerzo (número de organismos por viaje) observada en la pesca deportiva en el a o "tipo". Los resultados son consistentes con la existencia de un sólo stock en la región, que realiza desplazamientos costeros latitudinales durante el verano, desde un punto al sur del Pacífico mexicano, en dirección norte hasta el Golfo de California, para después regresar nuevamente al sur al final de esta temporada. Se apreció un mejor ajuste del modelo cuando se simuló una mortalidad de 0.019 veces la abundancia por día para la región norte del Pacífico mexicano (equivalente a z = 0.013/mes). Este escenario es consistente con los patrones migratorios conceptuales anteriormente reportados, debido a esto se considera que el modelo propuesto puede ser una herramienta útil para predecir variaciones en las abundancias regionales y en general para elucidar el comportamiento del stock. Using catch and effort data recorded in sport fishing conducted in the ports of Mazatlan, Sin. and Buena Vista, BCS, Mexico, during 1979-2005 and 1985-2006, respectively, build a year "type" or average, and developed a deterministic model in discrete time space to simulate the seasonal mass movements that perform the sailfish (Istiophorus platypterus) in the Exclusive Economic Zone of the Mexican Pacific. The model parameters are the migration rates that define the movements, which were estimated by minimizing the squared differences between predicted by the model and the catch per unit effort (number of organisms per trip) observed in sport fishing in typical year. The results are consistent with the existence of a single stock in the region, which conducts coastal latitudinal displacement during the summer from a point south of the Mexican Pacific, toward the north in direction to the Gulf of California, and then returning to the south at the end this season. It shows a better fit of the model when simu
Modelo espacialmente explícito de la migración estacional del pez vela (Istiophorus platypterus) en el Pacífico mexicano
Macías-Zamora, René;Olivos-Ortiz, Aramis;Vidaurri-Sotelo, Ana Luisa;Carrasco-águila, Miguel ángel;Torres-Orozco, Ernesto;
Hidrobiológica , 2011,
Abstract: using catch and effort data recorded in sport fishing conducted in the ports of mazatlan, sin. and buena vista, bcs, mexico, during 1979-2005 and 1985-2006, respectively, build a year "type" or average, and developed a deterministic model in discrete time space to simulate the seasonal mass movements that perform the sailfish (istiophorus platypterus) in the exclusive economic zone of the mexican pacific. the model parameters are the migration rates that define the movements, which were estimated by minimizing the squared differences between predicted by the model and the catch per unit effort (number of organisms per trip) observed in sport fishing in typical year. the results are consistent with the existence of a single stock in the region, which conducts coastal latitudinal displacement during the summer from a point south of the mexican pacific, toward the north in direction to the gulf of california, and then returning to the south at the end this season. it shows a better fit of the model when simulating a mortality rate of 0,019 times per day abundance for the northern mexican pacific (equivalent to z = 0.013/month). this scenario is consistent with previously reported conceptual migration patterns, due to this it is considered that the proposed model can be a useful tool for predicting changes in regional abundance and in general to elucidate the behavior of the stock.
Detección rápida en el diagnóstico de Escherichia coli toxigénica productora de LT y VT
Zamora,J.; Reinhardt,G.; Polette,M.; Macías,P.;
Archivos de medicina veterinaria , 2000, DOI: 10.4067/S0301-732X2000000100010
Abstract: due to the great convenience of diagnosing the severity of the infections caused by lt and vt toxin producing e. coli strains, a work was planned for this purpose using the technique described by parreira and others (1994). a total 231 e. coli strains isolated from diarrheic suckling piglets under 40 days of age were used. these strains were tested for the capacity to produce toxins. to determine the production of lt and vt agar-overlay method with vero cells was used which allowed to detect 15 (6.4%) positive strains to lt production and 16 (6.9%) to the vt synthesis. the technique was simple, economic and rapid for the diagnostic of the ltec and vtec strains
Plásmido de virulencia en Yersinia enterocolitica O:3 de origen murino
Zamora B,Justo; Reinhardt V,Germán; Macías H,Pamela;
Revista médica de Chile , 1998, DOI: 10.4067/S0034-98871998000700006
Abstract: background: pathogenic strains of yersinia enterocolitica harbor a virulence plasmid of 45-48 megadalton that can be detected using different techniques. rodents are important reservoirs of y enterocolitica. aim: to investigate the carrier status of y enterocolitica in murine rodents. material and methods: two hundred sixty one mice and rats were captured in rural and urban areas of valdivia. y enterocolitica was cultured from viscera and fecal homogenates. virulence plasmids were detected using crystal violet binding. results: thirteen y enterocolitica strains were isolated from 11 rodents. ten strains belonged to the biotype 1 and three to the biotype 4, serotype o:3. the most frequently infected rodent species were r norvergicus (20%), followed by a longipilis (11%), a olivaceus (2%) and o longicaudatus (2%). conclusions: rodents, and specially the domestic rat, can be an important source of y enterocolitica infection for human and susceptible animal species.
Plásmido de virulencia en Yersinia enterocolitica O:3 de origen murino Virulence plasmid in Yersinia enterocolitica O:3 of murine origin
Justo Zamora B,Germán Reinhardt V,Pamela Macías H
Revista médica de Chile , 1998,
Abstract: Background: Pathogenic strains of Yersinia enterocolitica harbor a virulence plasmid of 45-48 megadalton that can be detected using different techniques. Rodents are important reservoirs of Y enterocolitica. Aim: To investigate the carrier status of Y enterocolitica in murine rodents. Material and methods: Two hundred sixty one mice and rats were captured in rural and urban areas of Valdivia. Y enterocolitica was cultured from viscera and fecal homogenates. Virulence plasmids were detected using crystal violet binding. Results: Thirteen Y enterocolitica strains were isolated from 11 rodents. Ten strains belonged to the biotype 1 and three to the biotype 4, serotype O:3. The most frequently infected rodent species were R norvergicus (20%), followed by A longipilis (11%), A olivaceus (2%) and O longicaudatus (2%). Conclusions: Rodents, and specially the domestic rat, can be an important source of Y enterocolitica infection for human and susceptible animal species.
L'attualità di David Hilbert - tavola rotonda coordinata da V. Villani
Vinicio Villani
Le Matematiche , 2000,
Abstract: Qui di seguito sono riportati gli interventi alla tavola rotonda, ...
Criteri di valutazione degli strumenti a fiato antichi
Vinicio Gai
Aestimum , 1985,
Abstract:
I “VANTAGGI” DELLA SCUOLA MULTICULTURALE
Vinicio Ongini
Italiano LinguaDue , 2012, DOI: 10.6092/2037-3597/2281
Abstract: Nella prima parte il testo presenta un quadro aggiornato sugli alunni con cittadinanza non italiana nelle scuole: quantità, percentuali, provenienze, neo arrivati, nati in Italia, confronto con altri Paesi europei, con alcune annotazioni sulla percezione del fenomeno. Si delinea un “paesaggio” italiano con tre caratteristiche: velocità del cambiamento (soprattutto rispetto ad altri Paesi europei); policentrismo diffuso (la dimensione multiculturale coinvolge non solo le scuole delle grandi città ma anche le piccole città e i paesi); la molteplicità delle cittadinanze (la presenza di molte diversità di provenienze e di lingue e culture nelle scuole e nelle classi). Nella seconda parte si presenta un “decalogo” dei possibili vantaggi della dimensione plurilingue e multiculturale attraverso alcune parole chiave ricavate dall’autore attraverso un viaggio esplorativo nelle scuole d’Italia. THE “ADVANTAGES” OF A MULTICULTURAL SCHOOL The first part of this paper presents up-to-date information on non-Italian students enrolled in Italian schools: quantity, percentages, countries of origin, those born in Italy, compared to other European countries, with a few notes regarding how this phenomenon is perceived. The Italian “landscape” is characterized by three aspects: speed of change (especially in comparison to other European countries); wide-spread polycentrism (the multicultural dimension involves not only schools in large cities but also small cities and towns); the multitude of nationalities (there are many different nationalities, languages and cultures in schools). The second part presents the possible advantages of the multilingual and multicultural dimension through key words singled-out by the author thanks to explorations in Italian schools.
Optimización de la geometría de la bomba hidráulica tipo jet
Vinicio Melo
Enfoque UTE , 2010,
Abstract: Espa ol: Este trabajo presenta un método de cálculo directo para determinar la geometría óptima de una bomba jet para una aplicación determinada. Se revisan los conceptos necesarios del bombeo hidráulico tipo jet para poder explicar el procedimiento de dimensionamiento. El método usa las curvas de comportamiento de las bombas jet. Se calcula un área de tobera y se selecciona una relación de áreas. Esta información se usa para seleccionar una de las geometrías dadas por cualquier fabricante. Se presenta la secuencia de cálculos junto con un ejemplo de aplicación.
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