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Search Results: 1 - 10 of 14192 matches for " Silvia Hortencia; Lemus Flores "
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Efecto de genes candidatos sobre características reproductivas de hembras porcinas
Hernández López,Silvia Hortencia; Lemus Flores,Clemente; Morales,Rogelio Alonso; Herrera Haro,José Guadalupe;
Revista Científica , 2006,
Abstract: candidate genes were studied for litter size in 300 sows yorkshire-landrace; esr, prlr, rbp4 y fut1. the sows were grouped in two levels of production (lp): high level (hl) and low level (ll). using chi-square test the alleles and genotypic frequencies were analyzed. employing analysis of variance with an mixed model effects for the total number born (tnb), number of piglets born alive (nba), number of piglets alive at weaning (nw), total weight of piglets born (wtnb), total weight of piglets alive at weaning (wnw) and breeding value sow productivity (bvsp). the means were compared by orthogonal contrasts. the sows with high production were associated with a higher frequency of b allele of esr gene (p < 0.05). the differences were of 0.04 nba, 0.3 nw, 2.9 wnw kg and 8.6 bvsp points to favor of ab genotype of esr gene (p < 0.05) without considering the lp and no homozygous bb animal was detected. the alleles and genotypic frequencies of prlr gene were not related with the lp (p > 0.05), did not have differences (p > 0.05) between the genotypes aa, ab and bb without considering the lp, neither within of same lp. in the rbp4 gene the frequency of a allele and the aa genotype was higher in sows with hl (p < 0.05), no homozygous bb animals were detected. the sows with aa genotype had 0.5 tnb, 0.5 nba, 0.6 wtnb kg, 2.6 wnw kg and 3.2 bvsp points more than sows with ab genotype (p < 0.05), without considering the lp. the frequency of g allele and gg genotype of fut1 gene was higher in the hl (p < 0.05). the gg genotype was higher than ag genotype with 0.6 tnb, 0.8 wtnb kg, 3.0 wnw kg and 3.9 bvsp points more (p < 0.05), without considering the lp
Analysis of the Influence of Wind Turbine Noise on Seismic Recordings at Two Wind Parks in Germany  [PDF]
Hortencia Flores Estrella, Michael Korn, Kilian Alberts
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.55006
Abstract: We recorded continuous seismic noise close and around two wind parks with different geological site conditions in order to investigate the effects of wind turbines on seismic signals in the frequency interval between 1 and 10 Hz. In wind park Fraureuth-Beiersdorf (5 turbines, 11 km south from Zwickau, Saxony), we used small seismic networks, with 3 to 5 stations for 1 - 2 weeks. In Heinde (2 turbines, close to Hildesheim, Lower Saxony), we recorded 1 week with one station around 1 km away from the wind turbines and some additional stations for several hours only. With the spectrogram analysis of the data, we clearly identify the diurnal variation on the spectral amplitude separately from the noise generated by the turbines. The turbine noise appears at certain frequency bands around 2.2, 2.7, 3.3, 4.5, 5.2 and 6.6 Hz. A linear relation between the spectral amplitudes of these frequency bands and the wind velocity or rotation velocity of the turbines is clearly identified. The seismic signals produced by the operation of the wind turbines are not peaks at single frequencies, but look more like frequency bands with increased noise amplitudes. They could be identified up to at least 10 km in the case of Fraureuth-Beiersdorf. These bands depend on numerous parameters, i.e. wind turbine height, weight and construction, number of turbines, geology, etc. In both wind parks we also recorded along profiles with increasing distances from the wind turbines. With the analysis of these data, we propose an amplitude attenuation model for the wind park Fraureuth-Beiersdorf to a distance of 9 km, and for Heinde to a distance of 4 km. The attenuation models for both wind parks are quite different, depending probably on the local geology and topography.
SPAC: An alternative method to estimate earthquake site effects in Mexico City
Hortencia Flores Estrella,Jorge Aguirre González
Geofísica internacional , 2003,
Abstract: Microtremor recordings are a very useful tool for microzonation studies because of simple data acquisition and analysis. The Spatial Autocorrelation Method (SPAC) proposed by Aki (1957), may be used to constrain the velocity structure underlying the site with microtremor array measurements, and the site effect (dominant period and amplification) can be calculated. In this paper the SPAC method is applied to Ciudad Universitaria, Mexico City. Results are compared with those obtained by Kagawa (1996) with the F-K method. The velocity structure inferred using SPAC method is consistent with Kagawa′s results. We compare the transfer function obtained from the velocity model estimated by SPAC method with the transfer function from Kagawa′s velocity model, and from spectral ratios of earthquake data. We conclude that the velocity structure of a site can be estimated from microtremor recordings by the SPAC method.
RESPUESTA SíSMICA EN EL LAGO DE TEXCOCO. RESULTADOS A PARTIR DE REGISTROS DE MOVIMIENTOS FUERTES
Hortencia Flores Estrella,Martín Cárdenas Soto,Cinna Lomnitz
Revista de Ingeniería Sísmica , 2009,
Abstract: En 1995 se instaló un arreglo acelerométrico constituido por seis estaciones en superficie, que formaron dos triángulos con aperturas de 30 y 400 m y un arreglo vertical con instrumentos en cinco profundidades, que alcanzaron los 40 m. La base de datos de este arreglo consta de ocho eventos de movimientos fuertes (5.9 < M < 7.9) que analizamos para obtener la respuesta sísmica, el modelo de velocidades y el espectro de respuesta de sitio. Los resultados de este estudio muestran que la respuesta de sitio está caracterizada por la frecuencia fundamental en 0.37 Hz. El análisis de los registros en pozo permitió obtener un modelo de velocidades que está constituido por dos capas, con factores de atenuación Q distintos para cada una; la amplificación dinámica, debida a las propiedades físicas de las arcillas lacustres, domina la respuesta de sitio. Finalmente, el espectro de respuesta muestra que las seudoaceleraciones máximas en el sitio se encuentran en dos intervalos de periodo: entre 0 y 1 s y entre 2 y 3 s, con ordenadas espectrales de 0.6 g y 0.74 g, respectivamente.
Microtremor studies using the SPAC method: Experiences and applications to four sites in Mexico
Vázquez Rosas, Ricardo;Aguirre, Jorge;Flores Estrella, Hortencia;Mijares Arellano, Horacio;
Geofísica internacional , 2011,
Abstract: recording and analysis of microtremors is used in seismic risk evaluation. we discuss the applicability and results for the spatial autocorrelation method (spac), which estimates a site velocity model for id propagation wave modeling and more complete site response estimation. we present results for four mexican cities with different spatial, urban and geological conditions. the purpose and requirements are different for each particular study. this affects the spatial array settings and the depth resolution for the spac method. we discuss these studies and their corresponding results. we conclude that it is possible to characterize site effects and site response using small linear arrays. depending on the geological conditions, it is possible to reach deep layers.
Comparación de las pruebas rosa de bengala y rivanol con elisa para el diagnóstico de brucelosis bovina - Comparing the rosa de bengala and rivanol in the elisa test for diagnosis of bovine brucellosis
Mejía Martínez, K,Lemus Flores C
REDVET , 2012,
Abstract: ResumenLa brucelosis es una enfermedad zoonótica que puede impactar fuertemente en el ámbito económico, además de representar un problema de salud pública.AbstractBrucellosis is a zoonotic disease that can have a strong impact on the economy and it represents a public health problem.
La familia Cruciferae en el estado de Aguascalientes
Adriana Cecilia Moreno Flores,Margarita Elia de la Cerda Lemus
Investigación y Ciencia de la Universidad Autónoma de Aguascalientes , 2010,
Abstract: Como parte del Taller de Investigación adscrito al proyecto “Flora del Estado de Aguascalientes” se realizó el estudio florístico de la familia Cruciferae (Brassicaceae), para lo cual se llevaron a cabocolectas al azar, marcando 8 localidades en cada municipio de la entidad, principalmente,a orilla de caminos, cultivos y sitios con disturbio debido a que la mayoría de las especies de esta familia son malezas. Se identificaron los ejemplares colectados, consultando bibliografía especializada, de acuerdo a los resultados encontrados se registran 17 géneros con 25 especies, reportando por primera vez para Aguascalientes 3 géneros Mancoa Weddell., Hirschfeldia Moench. y Rapistrum Crantz., y 9 especies Brassica nigra (L.) Koch., B. kaber (DC.) Wheeler, B. tournefortii Gouan, Halimolobos berlandieri (Fourn.) O. E. Schulz., Hirschfeldia incana (L.) Lagreèze- Fossat, Lepidium schaffneri Thell., L. sordidum A. Gray, Mancoa bracteata(S. Wats.) Rollins y Rapistrum rugosum (L.) All. Se elaboraron claves taxonómicas para la identificación de géneros y especies; a suvez, se realizaron descripciones de las mismas, ilustraciones y mapas de distribución.
Biología reproductiva y crecimiento de Pimelodus clarias maculatus (Lac. 1803) (Pisces, Pimelodidae) en la zona de influencia del embalse Yacyretá
Araya,Patricia; Hirt,Lourdes; Flores,Silvia;
Ecolog?-a austral , 2003,
Abstract: we analyzed growth and reproductive dynamics of pimelodus clarias maculatus (lac. 1803) in the influence area of yacyretá dam, paraná river, argentina. this species is of a relative economic importance and is frequently captured in this river. samples were collected between 1990 and 1997 from experimental fisheries using gill nets of different mesh sizes. three different gonadal stages were recognized: pre-vitellogenesis, vitellogenesis and post-spawning. the reproductive period spanned from august to march. maximum gonadal activity was recorded from october to march, in coincidence with the annual maximum hydrometric level (over 3 m). we observed a positive correlation between the gonadal somatic and both hydrometric level and temperature. spawning was not continuous and ovocyte development was synchronic in more than two groups of ovocites. standard length at first maturity was 190 mm. absolute mean fecundity was 97000 ovocytes per female. ages 1 to 7 were recognized using growth marks of dorsal spines. the most frequent age was 4 for males and 5 for females. mean standard length at ages 3, 4 and 5 was greater for females. the b parameter of the length-weight relationship was less than 3, suggesting a negative allometric growth for both sexes.
The flexor tendons in the didelphid manus
Abdala,Virginia; Moro,Silvia; Flores,David A.;
Mastozoolog?-a neotropical , 2006,
Abstract: tetrapods have flexor tendons in the palmar surface of the manus that transmit forces generated by superficial and deep forearm muscles to the digits. two patterns ("p" and "l") of tendinous connections among the deep layer of the forearm muscles and the digits have been described, one of which (pattern p) shows an empirical correlation with some grade of arboreality. in this article, we focused on the anatomical design of the tendons of the deep layer of the palmar surface of the didelphid manus, and associated muscles. our objectives are: (1) to describe the pattern found in all taxa of the great didelphid clade, (2) to assign the designs that we found to the l or p pattern, and (3) to discuss our results in the context of the latest available phylogenetic hypotheses proposed for those taxa. all of the didelphids we dissected possess the p pattern. as we compared the tendinous and myological structures, we found that some of the myological differences we describe could have important phylogenetic implications. we selected 10 characters, mapped them on marsupial phylogenies, and discovered six more synapomorphies supporting clades already proposed by other researchers.
The flexor tendons in the didelphid manus
Virginia Abdala,Silvia Moro,David A. Flores
Mastozoolog?-a neotropical , 2006,
Abstract: Tendones flexores en didelfidos. Los tetrápodos tienen tendones flexores en la superficie palmar de la mano, que transmiten a los dígitos las fuerzas generadas por los músculos superficiales y profundos del antebrazo. Se han descripto dos patrones (P y L) de conexión tendinosa entre la capa profunda de los músculos del antebrazo y los dedos. De éstos, el patrón P muestra correlación empírica con algún grado de arborealidad. En este artículo, nos enfocamos en el dise o anatómico de los tendones de la capa profunda de la superficie palmar de las manos de los didelfidos y músculos asociados. Nuestros objetivos son: (1) describir el patrón encontrado en todos los taxa del gran clado de los didelfidos, (2) asignar el dise o encontrado al patrón P o L, y (3) discutir nuestros resultados en el contexto de las filogenias más recientes para los grupos considerados. Todos los didelfidos disecados exhiben un patrón P. Cuando comparamos las estructuras miológicas y tendinosas entre los grupos, encontramos algunos que parecían tener importantes implicancias filogenéticas. Así, seleccionamos 10 caracteres, los mapeamos en las filogenias disponibles para marsupiales y encontramos 6 sinapomorfías que soportan clados propuestos previamente por otros autores.
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