oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 664 )

2018 ( 1137 )

2017 ( 1066 )

2016 ( 1448 )

Custom range...

Search Results: 1 - 10 of 609651 matches for " María L.; González "
All listed articles are free for downloading (OA Articles)
Page 1 /609651
Display every page Item
La sociolingüística de los medios de comunicación
López González, Antonio María
Linguistik Online , 2002,
Abstract: This article shows the different kinds of approaches to the mass media from the sociolinguistics, and the meaning of these studies for the society itself. A variety of points of view and topics studied by authors throughout the world conform the sociolinguistic works on mass media. Several topics are discussed about press, radio and television: sociolinguistic prestige, linguistic uses in the media, production, product, reception, linguistic interaction, standardization, interaction between media and audience, media manipulation, didactic applications of the media, etc. The author presents a wide review of the works published in the last years on this issue. The article is accompanied by a long, comprehensive bibliographic chapter which indicates the studies of the sociolinguistics of mass media.
Plani-ficación familiar
María Dolores López González
Pensamiento Matemático , 2011,
Abstract: Este cuento trata de introducir al lector de unamanera informal y divertida en el mundo de la geometría plana y de los movimientos o isometrías. Con la medicina como metáfora conductora, son presentados conceptos geométricos como las rectas, sus intersecciones, o giros y traslaciones de las mismas.
Percoll Gradient Optimization for Blood CD133+ Stem Cell Recovery  [PDF]
Rosa María López-Franco, Jorge E. Moreno-Cuevas, María Teresa González-Garza
Stem Cell Discovery (SCD) , 2014, DOI: 10.4236/scd.2014.43007
Abstract:

Circulating CD133+ stem cells from the peripheral blood have been shown to be able to differentiate into numerous cell lineages. However, adults have only a small number of these circulating stem cells. The aim of the present study was to assess a new isolation and enrichment technique for CD133+ stem cells from peripheral blood with the use of Percoll density gradients. Our results demonstrated the presence of two large mononuclear bands when whole blood was centrifuged with 48% and 50% Percoll concentrations. Flow cytometric analysis (FACS) revealed a major CD133+ enrichment at the 48% Percoll concentration in one of the two bands. Further culture of these cells resulted in the formation of multiple colony-forming units. Our results suggest an advantage from using a simple Percoll gradient for successful CD133+ cell recovery, which could aid in differentiation and transplantation protocols.

Pyroclastic material from the Puyehue-Cordon-Caulle Volcanic Complex, Chile, as carrier of Beauveria bassiana conidia: Potential utilization in mycoinsecticide formulations  [PDF]
Santiago Schalamuk, Sebastián Pelizza, Ana Clara Scorsetti, María José González, Irma Lía Botto
Journal of Agricultural Chemistry and Environment (JACEN) , 2014, DOI: 10.4236/jacen.2014.31003
Abstract: The last volcanic eruption of the Puyehue-Cordon-Caulle Volcanic Complex in the Andes cordillera of western South America, occurring on 4 June 2011, ejected pyroclastic materials that were accumulated in a wide region of the northern Patagonia (Argentina), affecting the environment and health of residents within the area. The aim of this work was to evaluate the practicability of using this waste material as a lowcost carrier for mycopesticide formulations. Beauveria bassiana is a recognized fungal agent for arthropod biologic control. Lengthy storage is critical for the development of mycoinsecticide formulations. Accordingly, the search for adequate materials to improve the shelf life of biocontrol products becomes desirable. First, several analytical techniques were employed to characterize the pyroclast physicochemically; then the viability of the fungal conidia was evaluated after an 18-month storage in the volcanic material. Finally, the pathogenicity of the conidia after that prolonged maintenance in the vehicle was assessed on the beetle Alphitobius diaperinus, an insect pest in poultry houses that causes major economic losses. The results from those bioassays proved auspicious for the eventual utilization of the pyroclast as a bioinsecticide carrier especially since the formulation had proven to be stable for at least 18 months under a wide range of environmental conditions. The constant moisture in a closed environment within a 5°C - 40°C temperature range insures a viable state during storage. The results indicate that what would otherwise be volcanic waste may be utilized as an efficient, abundant, inexpensive, and environmentally innocuous carrier of entomopathogenic fungi.
EFECTOS DE LA PROFUNDIDAD DE PLANTACIóN Y POBLACIóN DE PLANTAS EN LA CALIDAD Y RENDIMIENTO DE ESPáRRAGO VERDE
González A.,María Inés; del Pozo L.,Alejandro;
Agricultura Técnica , 2003, DOI: 10.4067/S0365-28072003000300001
Abstract: the effect on asparagus (asparagus officinalis l.) yield and quality of three planting depths (10, 20 and 30 cm) and two plant densities (22 222 and 33 333 plants ha-1) was assessed in the sub-humid mediterranean climatic zone of chile. crowns of the cv. uc-157 f1 were transplanted to a volcanic soil in september 1995. the experimental design was a randomized complete block in a factorial arrangement, with four replications. the plots were harvested on a daily basis during five seasons (1997-2001), and the number, weight and diameter of spears were determined after trimming at 18 cm. no interaction was detected between the studied factors on yield and its components. high plant density only increased the yield in the first harvest season (1997), whereas planting depth had an effect during the first four harvest seasons (1997-2000), but this effect disappeared in the fifth harvest season (2001). the maximum commercial yield was obtained during the third harvest season (1999) at the most superficial planting depth (10 cm) with production of 10.2 t ha-1. the number of harvested spears per m2 and the proportion of thin spears (7-17 mm) decreased on increasing planting depth from 10 to 30 cm. the number of utilized buds per plant was greater (p £ 0,05) at the lowest plant density (22,222 plants ha-1) and decreased as planting depth increased from 10 to 30 cm. finally, seven years after planting, the asparagus crown depth was shallower in the three planting depths but continued being different (p £ 0,05).
Developmental Responses of Garlic to Temperature and Photoperiod
del Pozo L.,Alejandro; González A.,María Inés;
Agricultura Técnica , 2005, DOI: 10.4067/S0365-28072005000200001
Abstract: bulb initiation and maturity of four chilean clones of garlic (allium sativum l.) were studied in controlled and field conditions in order to assess temperature and photoperiod requirements of selected clones. the effect of cold storage temperature prior to planting and photoperiod on bulb initiation was assessed in two clones of garlic. in one experiment bulbs were stored at 4, 7, 10, 13 and 16°c for 20, 40 or 60 days, and planted in pots in a heated greenhouse with a 14 h photoperiod. in a second experiment bulbs of the same clones were stored at 4 and 10°c, and room temperature (> 13°c) for 30 days, and later grown in a heated greenhouse with 8, 10, 12, 14 or 16 h of photoperiod. in the field, days from emergence to bulb initiation and to maturity were evaluated in 13 clones planted on six sequential planting dates. percentage of bulbing increased and the number of days from emergence to bulb initiation decreased, as storage temperature decreased and duration of storage increased. plants of studied clones did not form bulbs with photoperiods of 8, 10 or 12 h with any storage temperature. all plants of both clones formed bulbs when photoperiod was over 14 h and storage temperature was 4 or 7oc. a reduction on the period emergence-bulb initiation was observed as planting date was delayed from april to september.
EFECTOS DE LA PROFUNDIDAD DE PLANTACIóN Y POBLACIóN DE PLANTAS EN LA CALIDAD Y RENDIMIENTO DE ESPáRRAGO VERDE Effect of planting depth and plant population on quality and yield of green asparagus
María Inés González A.,Alejandro del Pozo L.
Agricultura Técnica , 2003,
Abstract: Se estudió el efecto de tres profundidades (10, 20 y 30 cm) y dos densidades de plantación (22.222 y 33.333 plantas ha-1) sobre el rendimiento y calidad del espárrago (Asparagus officinalis L.) en la zona climática mediterránea sub-húmeda de Chile. Se trasplantaron coronas del cv. UC-157 F1 a un suelo de origen volcánico en septiembre de 1995. El dise o experimental fue de bloques completos al azar en un arreglo factorial con cuatro repeticiones. Las parcelas fueron cosechadas diariamente durante cinco temporadas (1997-2001), y se determinó el número, peso y diámetro de los turiones después de cortarlos a 18 cm. No se detectó interacción entre los factores en estudio sobre el rendimiento y sus componentes. La densidad de plantas sólo tuvo efecto en la producción de turiones en la primera temporada de cosecha (1997), mientras que la profundidad de plantación tuvo efecto durante las primeras cuatro temporadas (1997-2000), desapareciendo en la quinta temporada de cosecha (2001). El máximo rendimiento comercial se obtuvo en la tercera temporada de cosecha (1999) con la menor profundidad de plantación (10 cm), alcanzando a 10,2 t ha-1 El número de turiones cosechados por m2 y la proporción de turiones delgados (7-17 mm) disminuyó al aumentar la profundidad de plantación desde 10 a 30 cm. El número de yemas utilizadas por planta fue superior (P <= 0,05) en la menor densidad de plantas (22.222 plantas ha-1) y disminuyó al aumentar la profundidad de plantación desde 10 a 30 cm. Finalmente, después de siete a os desde la plantación, la profundidad de las coronas de espárrago disminuyó en las tres profundidades de plantación, pero continúan siendo diferentes (P <= 0,05). The effect on asparagus (Asparagus officinalis L.) yield and quality of three planting depths (10, 20 and 30 cm) and two plant densities (22 222 and 33 333 plants ha-1) was assessed in the sub-humid Mediterranean climatic zone of Chile. Crowns of the cv. UC-157 F1 were transplanted to a volcanic soil in September 1995. The experimental design was a randomized complete block in a factorial arrangement, with four replications. The plots were harvested on a daily basis during five seasons (1997-2001), and the number, weight and diameter of spears were determined after trimming at 18 cm. No interaction was detected between the studied factors on yield and its components. High plant density only increased the yield in the first harvest season (1997), whereas planting depth had an effect during the first four harvest seasons (1997-2000), but this effect disappeared in the fifth harvest season (2001). T
Developmental Responses of Garlic to Temperature and Photoperiod Respuestas en Desarrollo del Ajo a la Temperatura y el Fotoperíodo
Alejandro del Pozo L.,María Inés González A.
Agricultura Técnica , 2005,
Abstract: Bulb initiation and maturity of four Chilean clones of garlic (Allium sativum L.) were studied in controlled and field conditions in order to assess temperature and photoperiod requirements of selected clones. The effect of cold storage temperature prior to planting and photoperiod on bulb initiation was assessed in two clones of garlic. In one experiment bulbs were stored at 4, 7, 10, 13 and 16°C for 20, 40 or 60 days, and planted in pots in a heated greenhouse with a 14 h photoperiod. In a second experiment bulbs of the same clones were stored at 4 and 10°C, and room temperature (> 13°C) for 30 days, and later grown in a heated greenhouse with 8, 10, 12, 14 or 16 h of photoperiod. In the field, days from emergence to bulb initiation and to maturity were evaluated in 13 clones planted on six sequential planting dates. Percentage of bulbing increased and the number of days from emergence to bulb initiation decreased, as storage temperature decreased and duration of storage increased. Plants of studied clones did not form bulbs with photoperiods of 8, 10 or 12 h with any storage temperature. All plants of both clones formed bulbs when photoperiod was over 14 h and storage temperature was 4 or 7oC. A reduction on the period emergence-bulb initiation was observed as planting date was delayed from April to September. Se estudió la bulbificación y maduración de clones de ajo (Allium sativum L.) chilenos bajo condiciones controladas y de campo a fin de determinar los requerimientos de temperatura y fotoperíodo de los clones seleccionados. Se estimó el efecto del almacenaje en frío previo a la plantación y del fotoperíodo en la bulbificación de dos clones de ajo. En un experimento se almacenaron bulbos a 4, 7, 10, 13 y 16°C por 20, 40 ó 60 días, y se plantaron en macetas en invernadero calefaccionado, con 14 h de fotoperíodo. En un segundo experimento se almacenaron bulbos de los mismos clones a 4 y 10°C y temperatura ambiente (>13°C) durante 30 días, y luego se hicieron crecer en invernadero calefaccionado con fotoperíodos de 8, 10, 12, 14 ó 16 h. En el campo, se evaluaron los días desde emergencia a inicio de bulbificación y a madurez en 13 clones plantados en seis fechas consecutivas. El porcentaje de bulbificación aumentó y el número de días desde emergencia a bulbificación disminuyó a medida que la temperatura de almacenaje disminuyó y el tiempo de almacenaje aumentó. Las plantas de los clones estudiados no formaron bulbos con fotoperíodos de 8, 10 ó 12 h, con cualquier temperatura de almacenaje. Todas las plantas de ambos clones formaron bulbos cuando el
Behavior of Arsenic and Fluoride Concentration in Guadiana Valley Aquifer of Durango, Mexico  [PDF]
María Adriana Martínez-Prado, María Elena Pérez-López, Ignacio Villanueva-Fierro, Cecilia Corazón González-Nevarez
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.412A2003
Abstract:

Fluorine (F) and arsenic (As) are inorganic elements present in the subsurface depending on the geology of the region. These compounds are found in high concentrations in the underground strata of Guadiana Valley of Durango affecting water quality for human consumption (NOM-127-SSA-1994). In the present research the main objective was to assess the behavior in time and space of fluoride (F-) and arsenic concentration, from 1996 to date, in the groundwater of the city of Durango and some wells of the rural area as a reference. The highest concentration of arsenic was found in a rural well, Colonia Hidalgo (0.149 mg/L or ppm), 6 times the maximum permissible limit (MPL); within the city well 54 located in the western sector had the highest value (0.076 ppm), 3 times the MPL, 67% of the wells in the city and 60% of the Guadiana Valley had levels that exceeded the MPL (0.025 ppm), the concentration in the city ranged from 0.009 to 0.149 ppm and from 0.08 to 0.15 ppm for the rural zone. With respect to F-, the highest value was also found in the Colonia Hidalgo well (17.8 mg/L), 12 times the MPL; within the city the highest value was recorded in well 16 in the eastern sector with 7.6 ppm (5 times the MPL) 97% of the wells in the city and 100% of the wells in the Guadiana Valley rural area had concentrations greater than MPL (1.5 ppm), the concentration in the city ranged from 1.1 to 7.6 ppm, while in the Guadiana Valley from 1.7 to 17.8 ppm. Statistical analysis showed no significant difference for fluoride concentration over time (1996-2013); whereas the concentration of arsenic decreased, probably due to the degree of precision required for such small concentrations in groundwater and different analysts ran the samples.

Un esquema de estimación de la precipitación estival en la ciudad de Buenos Aires
Cariaga,María L.; González,Marcela H.;
Meteorologica , 2010,
Abstract: the aim of this study is to estimate december to february rainfall in buenos aires city and its surroundings, using atmospheric variables. summer rainfall in buenos aires was correlated with sea surface temperature, 1000 hpa, 500 hpa and 200 hpa geopotential heights, sea surface pressure, 850 hpa zonal and meridional and specific humidity from the ground to 700 hpa, observed in the previous month. some predictors were selected based on the statistical significance, the independence and the physical meaning and they were used as entrance variables to generate a multiple linear regression using the"forward stepwise" method. the selected predictors were: 1000 hpa geopotential height in the atlantic ocean coast, near 25os and zonal wind in central south america near 15os. therefore the final model showed that summer rainfall is mainly influenced by the weakening of the atlantic anticyclone and the moist air advection from the north. the verification was done for 1984-2007 period and the correlation between the observed and estimated rainfall was 0.61. the stability of the model was proved using a crossvalidation methodology. the results were encouraging and indicate the existence of certain rainfall predictability in summer for buenos aires area.
Page 1 /609651
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.