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Search Results: 1 - 10 of 204199 matches for " Oscar Adrián Lozano Garza "
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New Interpretations about Clonal Architecture for the Sour Pitaya (Stenocereus gummosus, Cactaceae), Arising from Microsatellite Markers of de novo Isolation and Characterization  [PDF]
Oscar Adrián Lozano Garza, José L. León de la Luz, Susana Favela Lara, Francisco J. García de León
Open Journal of Genetics (OJGen) , 2015, DOI: 10.4236/ojgen.2015.51001
Abstract: The use of molecular markers has improved the ecological and evolutionary research in the case of clonal reproduction species, allowing the identification of boundaries among clonal modules (ramets), genetic individuals (genets), and populations. Microsatellite markers were developed for Stenocereus gummosus, a columnar cactus with both sexual and clonal reproduction which is distributed in the Sonoran Desert, Mexico. 454-Pyrosequencing reads were analyzed to detect microsatellite markers. Forty primer pairs were screened to look for polymorphism. Nine loci were genotyped for two S. gummosus localities. Sampling strategy was intended to avoid collecting a genetic individual more than once, considering that clonal architecture for this cactus was previously deduced as clumped. Polymorphic loci exhibited low allele count, ranging from 2 - 7 (mean of 3.78 ± 0.62 SE); mean heterozygosity values were 0.221 and 0.234 HO and 0.408 and 0.306 HE, with FIS of 0.383 and 0.299, for peninsular and continental localities respectively. Unexpectedly, some multilocus genotypes were found repeated within locality, which were assumed as clones since data was evaluated as sufficient (clonal richness R of 0.966 and 0.897). These results were different from those previously reported: the distribution of clones might as well be intermingled, having a minimum ramet dispersion distance of 30 m. This characteristic was also consistent with the recent colonization proposed for this and other arid lands plants. A wider genetic neighborhood, due to clone dispersion might affect diversity indexes while increasing the chance of geitonogamy and mating among relatives. The markers isolation and its population characterization allowed addressing new questions about S. gummosus ecology, clonal reproduction and reproductive biology.
Genetic Diversity of the Endemic Xantus’ Hummingbird Using 16 Novel Polymorphic Microsatellite Loci, and Their Cross Amplification between Six Related Species  [PDF]
Cristina González-Rubio Sanvicente, Ricardo Rodríguez-Estrella, Oscar Adrián Lozano-Garza, Francisco J. García-De-León
Open Journal of Genetics (OJGen) , 2016, DOI: 10.4236/ojgen.2016.61003
Abstract: A set of 16 microsatellite loci was developed and characterized for the Xantus’ hummingbird (Hylocharis xantusii) by using 454 next-generation sequencing. Twenty-five H. xantusii samples from one population were genotyped; all loci were polymorphic, with the number of alleles ranging from three to ten. The mean observed heterozygosity was 0.681 for all loci. No significant linkage disequilibrium was detected, but five loci (Hxan05, 06, 09, 13 and 14) showed deviation from Hardy-Weinberg equilibrium. These microsatellite loci are the first to be characterized for H. xantusii. A moderate to high level of cross-species amplification was observed across the six hummingbird species (31% - 87.5%), with the best cross amplification results observed in the closest related species (H. leucotis, Cynanthus latirostris, Calypte costae). The availability of these molecular tools allows assessing questions integrating population genetics, ecology, conservation, and evolutionary history for H. xantusii and for other phyogenetically related species.
Isolation and Characterization of 26 Microsatellite Loci for the Shortfin Silverside Fish Chirostoma humboldtianum Valenciennes1835 (Atherinopsidae: Menidiinae) Derived from Next Generation Sequencing and Their Cross-Amplification in Central Mexican Atherinopsids  [PDF]
Barriga-Sosa Irene de los Angeles, Rosa María García-Martínez, Jhoana Díaz-Larrea, Oscar Adrián Lozano Garza, Francisco Javier García-De-León
Open Journal of Genetics (OJGen) , 2014, DOI: 10.4236/ojgen.2014.45032
Abstract:

The endemic silverside fish C. humboldtianum is of great ichtyologycal, economical and cultural relevance in central Mexico and it has been suggested that it is among a group of other “peces blancos”, the most ancestral species. Here we characterized a set of 26 microsatellite loci from the species in order to further assess population and phylogeographic issues that aid in evaluating their highly impacted populations. From 58 primer pairs tested on specimens from Villa Victoria dam (Rio Balsas Basin), 26 loci positively amplified on the species and cross-primed on specimens of the closely related and threatened Poblana alchichica, C. promelas and C. riojai. Loci resolved medium and high genetic variation (mean NA = 14.3, SD = 9.38; mean HO & HE = 0.47, SD = 0.32 and 0.58, SD = 0.32, respectively) and it is expected that these polymorphic loci are also useful in studing threatened atherinopsid species.

Pensamento e linguagem: percurso piagetiano de investiga??o
Montoya, Adrián Oscar Dongo;
Psicologia em Estudo , 2006, DOI: 10.1590/S1413-73722006000100014
Abstract: this study aims at discussing piaget's course of investigation about the origins and the existent relationship between language and thought. in order to meet our goals, firstly, we will analyze the author's initial works about the evolution and socialization of children's thought and language, emphasizing the exogenous explanation of their progress. secondly, we will investigate the research studies carried out by piaget, during the 30's and 40's decades, about the motor-sensory origins of thought and language, focusing the endogenous explanation of their progress. thirdly, we will analyze the psycholinguistic studies related to normal and disabled children, which confirms piaget's thesis relevance, concerning the origins of thought and language. finally, we will point out some of the author's conclusive theses, based on his theoretical framework, concerning the critiques to contemporary empirical and positivist theories.
The 3D structure of turbulent channels up to $\mathrm{Re}_τ=4000$
Adrián Lozano-Durán,Javier Jiménez
Physics , 2012,
Abstract: Several time-resolved fluid dynamics videos of turbulent channels from $\mathrm{Re}_\tau=180$ to $\mathrm{Re}_\tau=4000$ are presented. The videos show the temporal evolution of sweeps (bluish) and ejections (reddish) in one half of the channel (only the bottom wall is shown). The color changes from dark for points close to the wall, to bright for those reaching the center of the channel. As the Reynolds number increases the scale separation becomes more clear and the complexity of the dynamics observed rises.
Auditory evoked potentials in children at neonatal risk for hypoacusis
Garza Morales,Saúl; Poblano,Adrián; Robledo Galván,Alicia; Fernández Carrocera,Luis Alberto;
Revista Panamericana de Salud Pública , 1997, DOI: 10.1590/S1020-49891997001000002
Abstract: brainstem auditory evoked potentials provide a simple, noninvasive method of evaluating hearing function and have been widely used for early detection of hypoacusis in children. between april 1992 and may 1994, a study was done of 400 mexican children who presented at least one neonatal risk factor for hearing impairment. the average age of the children studied was 6.6 months and their average gestational age at birth was 35.1 weeks. just over half of the children had been treated with amikacin. the study found 1427 risk factors (about 3.5 per child), the most common ones being exposure to ototoxic substances, hyperbilirubinemia, and birthweight <1500 g. in 27% of the children, peripheral auditory changes were found, and 13% did not respond to auditory stimuli. low birthweight and young gestational age at birth, high serum concentration of bilirubin, sepsis, subependymal or intraventricular hemorrhage, mechanical ventilation, and exposure to ototoxic substances were significantly associated with the presence of severe or profound hypoacusis.
Potenciales provocados auditivos en ni?os con riesgo neonatal de hipoacusia
Garza Morales,Saúl; Poblano,Adrián; Robledo Galván,Alicia; Fernández Carrocera,Luis Alberto;
Revista Panamericana de Salud Pública , 1997, DOI: 10.1590/S1020-49891997000200005
Abstract: auditory evoked potentials of the brain stem (aepbs) provide a simple, noninvasive method of evaluating hearing function and have been widely used for early detection of hypoacusis in children. between april 1992 and may 1994, a study was done of 400 mexican children who presented at least one neonatal risk factor for hearing impairment. the average age of the children studied was 6.6 months and their average gestational age at birth was 35.1 weeks. just over half of them (51%) had been treated with amikacin. the study found 1 427 risk factors (3.5 per child), the most common ones being exposure to ototoxic substances, hyperbilirubinemia, and birthweight of less that 1 500 g. in 27% of the children, peripheral auditory changes were found, and 13% did not respond to auditory stimuli. low birthweight and young gestational age at birth, high serum concentration of bilirubin, sepsis, subependymal or intraventricular hemorrhage, mechanical ventilation, and exposure to ototoxic substances were significantly associated with the presence of severe or profound hypoacusis.
Potenciales provocados auditivos en ni os con riesgo neonatal de hipoacusia
Garza Morales Saúl,Poblano Adrián,Robledo Galván Alicia,Fernández Carrocera Luis Alberto
Revista Panamericana de Salud Pública , 1997,
Abstract: Los potenciales provocados auditivos del tallo cerebral (PPATC) son un método sencillo y no invasor de evaluación de la función auditiva, que se utiliza ampliamente en ni os para detectar tempranamente hipoacusia. Entre abril de 1992 y mayo de 1994, se estudiaron 400 ni os mexicanos que presentaban, al menos, un factor de riesgo neonatal de hipoacusia. La media de la edad de los ni os estudiados fue 6,6 meses y la media de la edad gestacional al nacer, 35,1 semanas. El 51% de ellos fueron tratados con amikacina. Se registraron 1 427 factores de riesgo (3,5 por ni o), entre los que predominaron la exposición a ototóxicos, la hiperbilirrubinemia y el peso al nacer menor de 1 500 g. En 27% se encontraron alteraciones auditivas de tipo periférico y en 13%, ausencia de respuesta a estímulos auditivos. El bajo peso y la menor edad gestacional al nacer, la concentración máxima de bilirrubina en el suero, la presencia de sepsis, la hemorragia subependimaria o intraventricular, la ventilación mecánica y la exposición a ototóxicos se asociaron significativamente con la presencia de hipoacusia grave o profunda.
Auditory evoked potentials in children at neonatal risk for hypoacusis
Garza Morales Saúl,Poblano Adrián,Robledo Galván Alicia,Fernández Carrocera Luis Alberto
Revista Panamericana de Salud Pública , 1997,
Abstract: Brainstem auditory evoked potentials provide a simple, noninvasive method of evaluating hearing function and have been widely used for early detection of hypoacusis in children. Between April 1992 and May 1994, a study was done of 400 Mexican children who presented at least one neonatal risk factor for hearing impairment. The average age of the children studied was 6.6 months and their average gestational age at birth was 35.1 weeks. Just over half of the children had been treated with amikacin. The study found 1427 risk factors (about 3.5 per child), the most common ones being exposure to ototoxic substances, hyperbilirubinemia, and birthweight <1500 g. In 27% of the children, peripheral auditory changes were found, and 13% did not respond to auditory stimuli. Low birthweight and young gestational age at birth, high serum concentration of bilirubin, sepsis, subependymal or intraventricular hemorrhage, mechanical ventilation, and exposure to ototoxic substances were significantly associated with the presence of severe or profound hypoacusis.
Implante de un cardiodesfibrilador bicameral vía vena cava superior izquierda persistente
Atilio Abud,Oscar Didio,Adrián Carlessi,Bruno Strada
Revista Argentina de Cardiología , 2009,
Abstract: La vena cava superior izquierda persistente (VCSIP) es la anomalía congénita venosa deltórax más frecuente. Se encuentra en el 0,3% de la población general y en el 5-10% de lospacientes con cardiopatías congénitas. Generalmente evoluciona en forma asintomática yno genera trastornos hemodinámicos, pero su reconocimiento es importante, ya que puededificultar la introducción de catéteres para mediciones hemodinámicas, los implantes demarcapasos cardíacos (MCP) y de cardiodesfibriladores automáticos implantables (CDAI),especialmente cuando se utiliza la vía cefálica o la subclavia izquierda.En el caso clínico que se presenta se efectuó el implante de un CDAI bicameral vía VCSIP,descubierta durante el procedimiento. Asimismo, se muestran las características de estavariedad anatómica mediante tomografía cardíaca computarizada de 64 cortes (TCC64).REV ARGENT CARDIOL 2009;77:224-226.
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