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Search Results: 1 - 10 of 302283 matches for " Léo;Palomino "
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P450 arom y microambiente estrogénico en endometrios eutópicos de mujeres con endometriosis P450Arom and estrogenic microenvironment of eutopic endometria in endometriosis
M Cecilia Johnson P,Claudio Pinto O,Alessandra Alves L,Alberto Palomino A
Revista médica de Chile , 2004,
Abstract: Background: Endometriosis, a common gynecologic disorder characterized by endometrial glands and stroma outside the uterus, is diagnosed by direct visualization of peritoneal and ovarian implants during laparoscopy. Aim: To study the estrogenic microenvironment in eutopic endometria of women with and without endometriosis. Patients and methods: Eutopic endometria, obtained during laparoscopy from 23 women with endometriosis and 20 fertile cyclic women undergoing tubal sterilization, was studied. P450Arom mRNA expression (RT-PCR) was measured. Also, P450Arom activity was assessed measuring testosterone conversion to estradiol and the concentration of this last hormone in cultured endometrial explants. Results: Age and body mass index was similar in both groups studied. Seventy nine percent of endometria from women with endometriosis and in 29.4% from control group expressed P450Arom mRNA (p <0.01). The intensity of the band was higher in secretory endometria from women with endometriosis when compared to controls (p <0.01), but it was similar during the proliferative phase. Estradiol secretion to the culture media by proliferative endometria explants from women with endometriosis was 3-fold higher than secretory endometria (p <0.01) and endometria from control women in both phases. P450Arom activity, in the presence of testosterone, was 7-fold higher in endometrial cultures from women with endometriosis, when compare with the basal culture (p <0.01). However, in endometrial explant cultures from control women, this activity was not statistical different. Conclusions: These results indicate that in women with endometriosis, the microenvironment in the endometria is estrogenic as a consequence of an increased expression and activity of the P450 Arom (Rev Méd Chile 2004; 132: 1475-82).
Influencia de virus respiratorios, frío y contaminación aérea en la infección respiratoria aguda baja del lactante
Avenda?o C,Luis F; Céspedes L,Alejandra; Stecher G,Ximena; Palomino M,María Angélica;
Revista médica de Chile , 1999, DOI: 10.4067/S0034-98871999000900006
Abstract: background: all winters, there is an increase in the number of pediatric consultations, associated to three factors: cold weather, air pollution and respiratory virus epidemics. aim: to study the influence of these three factors in the demand for pediatric consultations between march and september, in an area of metropolitan santiago. patients and methods: the number of consultations between march and september 1998 in the emergency room and the number of hospital discharges due to lower respiratory tract infections, were registered in a public pediatric hospital of santiago. a respiratory virus surveillance (respiratory syncytial virus, adenovirus, influenza and parainfluenza virus) was done among children admitted for lower respiratory infections. atmospheric temperature values and air pollution, measured as the number of particles of 10 μm or more per m3 (mp 10), were obtained from local health services. results: two elevation waves of outpatient consultations were detected at weeks 19 and 26, that coincided with the periods of maximal detection of influenza and syncytial respiratory virus, respectively. the epidemics of respiratory syncytial virus coincided with the maximal number of hospital admissions for lower respiratory tract infections at week 27. there was no correlation between air pollution and the number of pediatric consultations. the lower ambient temperatures coincided with the higher detection of respiratory syncytial virus at week 28, moment in which the demand for consultations or hospital admissions was descending. conclusions: there is a direct relationship between respiratory virus epidemics and the demand for pediatric consultations. there is also a minor influence of ambient temperature.
Influencia de virus respiratorios, frío y contaminación aérea en la infección respiratoria aguda baja del lactante Influence of respiratory viruses, cold weather and air pollution in the incidence of lower respiratory tract infections in infants children
Luis F Avenda?o C,Alejandra Céspedes L,Ximena Stecher G,María Angélica Palomino M
Revista médica de Chile , 1999,
Abstract: Background: All winters, there is an increase in the number of pediatric consultations, associated to three factors: cold weather, air pollution and respiratory virus epidemics. Aim: To study the influence of these three factors in the demand for pediatric consultations between March and September, in an area of Metropolitan Santiago. Patients and Methods: The number of consultations between March and September 1998 in the emergency room and the number of hospital discharges due to lower respiratory tract infections, were registered in a public pediatric hospital of Santiago. A respiratory virus surveillance (respiratory syncytial virus, adenovirus, influenza and parainfluenza virus) was done among children admitted for lower respiratory infections. Atmospheric temperature values and air pollution, measured as the number of particles of 10 μm or more per m3 (MP 10), were obtained from local health services. Results: Two elevation waves of outpatient consultations were detected at weeks 19 and 26, that coincided with the periods of maximal detection of influenza and syncytial respiratory virus, respectively. The epidemics of respiratory syncytial virus coincided with the maximal number of hospital admissions for lower respiratory tract infections at week 27. There was no correlation between air pollution and the number of pediatric consultations. The lower ambient temperatures coincided with the higher detection of respiratory syncytial virus at week 28, moment in which the demand for consultations or hospital admissions was descending. Conclusions: There is a direct relationship between respiratory virus epidemics and the demand for pediatric consultations. There is also a minor influence of ambient temperature.
Estimative of genetic parameters in progeny test of Pinus caribaea Morelet var. hondurensis Barret & Golfari by quantitative traits and microsatellite markers
Tambarussi, Evandro Vagner;Sebbenn, Alexandre Magno;Moraes, Mário Luiz Teixeira de;Zimback, Léo;Palomino, Edwin Camacho;mori, Edson seizo;
Bragantia , 2010, DOI: 10.1590/S0006-87052010000100006
Abstract: the aims of this work were to estimate the coefficient of relatedness within families and the genetic parameters for growth related traits in a progeny test from an open-pollinated variety of pinus caribaea morelet hondurensis barret & golfari, established in mato grosso do sul state, brazil. the experimental design was the triple 10 x 10 lattice, with 96 families, three replicates, and ten plants per plot. fourteen years after planting, the trial was measured for the following traits: total height, diameter at breast height (dbh), and true volume. the estimation of coefficients of relatedness within family from microsatellite loci indicated that families are true half-sibs (^rxy = 0.253). thus, the additive genetic variance (σ2a) can be estimated assuming that the genetic variance among progenies (σ2p) accounts for ? of additive genetic variance (^σ2a = 4^σ2p). the estimative of heritability coefficients at individual level (hi2) was relatively high (0.28 for dbh and 0.44 for height). the heritability coefficient considering the average families (hm2) was also high, ranging among the traits from 0.50 to 0.58. these results suggest that the population can be improved by both massal and among families selection. additionally, the estimated genetic gains with sequential selection among and within families were high (ranging from 8.92% for height to 37.56% for volume), demonstrating that this method of selection can generate high genetic improvement.
P450 arom y microambiente estrogénico en endometrios eutópicos de mujeres con endometriosis
Johnson P,M Cecilia; Pinto O,Claudio; Alves L,Alessandra; Palomino A,Alberto; Fuentes G,Ariel; Boric S,M Angélica; Vega B,Margarita;
Revista médica de Chile , 2004, DOI: 10.4067/S0034-98872004001200004
Abstract: background: endometriosis, a common gynecologic disorder characterized by endometrial glands and stroma outside the uterus, is diagnosed by direct visualization of peritoneal and ovarian implants during laparoscopy. aim: to study the estrogenic microenvironment in eutopic endometria of women with and without endometriosis. patients and methods: eutopic endometria, obtained during laparoscopy from 23 women with endometriosis and 20 fertile cyclic women undergoing tubal sterilization, was studied. p450arom mrna expression (rt-pcr) was measured. also, p450arom activity was assessed measuring testosterone conversion to estradiol and the concentration of this last hormone in cultured endometrial explants. results: age and body mass index was similar in both groups studied. seventy nine percent of endometria from women with endometriosis and in 29.4% from control group expressed p450arom mrna (p <0.01). the intensity of the band was higher in secretory endometria from women with endometriosis when compared to controls (p <0.01), but it was similar during the proliferative phase. estradiol secretion to the culture media by proliferative endometria explants from women with endometriosis was 3-fold higher than secretory endometria (p <0.01) and endometria from control women in both phases. p450arom activity, in the presence of testosterone, was 7-fold higher in endometrial cultures from women with endometriosis, when compare with the basal culture (p <0.01). however, in endometrial explant cultures from control women, this activity was not statistical different. conclusions: these results indicate that in women with endometriosis, the microenvironment in the endometria is estrogenic as a consequence of an increased expression and activity of the p450 arom (rev méd chile 2004; 132: 1475-82).
Nonlinear Optical Properties of a MMA-Silica Nanohybrid Material Doped with Rhodamine 6G
J. Lima-Gutiérrez,R. Palomino-Merino,M. L. Arroyo Carrasco,E. Rubio-Rosas,V. M. Casta?o
Journal of Nanomaterials , 2013, DOI: 10.1155/2013/374185
Abstract: A novel nanohybrid material based on MMA-Silica has been synthesized with an organic dye dopant (R6G) to tailor the optical properties. This novel material can be used on several devices such as active laser media for an organic solid state laser, OLEDs, or as a characterization media for new organic dye molecules. Thin films were deposited by dip-coating and characterized by absorption and reflection UV-VIS, photoluminescence, SEM, and Z-scan technique to verify their nonlinear behavior. R6G dye dopant has been used to verify that the nanohybrid matrix does not inhibit its optical properties. 1. Introduction There is a need for developing new economical and simple materials suitable for different applications, in particular those related to nonlinear optical behavior, for applications ranging from nanomedicine to nanoelectronics. For instance, when a nonlinear material is doped with an organic dye it can be used as a laser medium for solid-state organic dye lasers. Nowadays solid-state polymeric dye lasers are of interest [1–3]; they can be used in medicine and cosmetology [4–6], optics [7, 8], electronics [9, 10], and other disciplines. New ways to generate laser light have been developed; tunable solid-state lasers can be obtained by the incorporation of guest dyes in solid host materials and this is one of the ideas that motivates this work. So far, several light-emitting solid systems based on the inclusion of laser dyes inside organic and inorganic solid matrix and hybrid and nanohybrid materials have been developed [11]. The use of sol-gel technique [12] allows incorporating dyes in a solid material at the nanoscale; this technique is based on the hydrolysis of a precursor, forming a gel, and in this part of the process a dopant can be added. When solvents are volatilized a nanoporous glass with the inclusion of the dopant is obtained. So this technique is important because it can change optical, mechanical, thermal, and electrical properties of the matrix formed by the precursor by adding different kinds of dopants like powders, liquids, organic and inorganic materials, nanoparticles, and so forth. The dopants chosen depends on the required material properties and the changes on the amount of dopant inside the matrix. For example, it is possible to add an organic dye to have specific optical properties and some polymer to change its mechanical properties, like flexibility, or to protect the organic dye; PMMA (polymethylmethacrylate) decreases organic dyes degradation on solid-state dye lasers. OLEDs [13, 14] are another technology where organic
Rareza, estatus de conservación y sus determinantes ecológicos. Revisión de su aplicación a escala regional
Carrascal, L. M.,Palomino, D.
Graellsia , 2006,
Abstract: This work reviews the relationships among the ecological basis of rarity, threat categories of species and the definition of their conservation status. When applying quantitative criteria to establish threat categories, there are many logical problems dealing with biodiversity conservation, biological problems dealing with the natural history of the species, and methodological problems linked to scientific design and reliability of the data; these limitations are assessed. It is not advisable to determine national or regional categories of threat when depending on speculative data without scientific credibility. This should be particularly worrying if regional rarity is based on purely biogeographical aspects (e.g., populations at the edges of total distribution ranges). Several alternatives are proposed to apply criteria determining the regional threat status. En este trabajo se efectúa una revisión crítica sobre la rareza ecológica, las categorías de amenaza de las especies y la definición de su estatus de conservación. En la aplicación de los criterios cuantitativos para establecer categorías de amenaza existen numerosos problemas lógicos asociados con la conservación de la biodiversidad, biológicos relacionados con la historia natural de las especies y metodológicos vinculados a aspectos de dise o científico y fiabilidad de los datos. No sería recomendable crear categorías que definan el estatus de amenaza a escalas nacional o regional cuando los datos utilizados sean pura especulación. Esto es especialmente preocupante cuando la rareza a escala regional venga motivada por aspectos puramente biogeográficos (e.g., poblaciones en bordes de distribución). Se proponen alternativas para la aplicación de criterios definitorios de estatus de conservación a escala regional (p.e., nacional o comunidades autónomas).
Preferencias de hábitat, densidad y diversidad de las comunidades de aves en Tenerife (Islas Canarias)
L. M. Carrascal,D. Palomino
Animal Biodiversity and Conservation , 2005,
Abstract: Species–specific habitat preferences, density and species richness of bird communities in Teneriffe (Canary Islands).— Bird distribution and abundance are described and analyzed in Teneriffe (Canary Islands). Inter–habitat differences in density, diversity and species richness are shown in table 1. Figure 2 shows the main determinants of bird species richness in Teneriffe, and tables 2 and 3 and figure 3 show the species–specific patterns of spatial variation abundance (more detailed for Anthus berthelotii, Fringilla coelebs canariensis, Fringilla teydea, Parus caeruleus teneriffae, Phylloscopus canariensis, Regulus teneriffae, Serinus canarius and Turdus merula cabrerae). Deeply transformed environments due to human impact (urban habitats, agricultural mosaics, banana plantations) have high bird densities and species richness, even higher than those measured in native, unmodified habitats such as laurel forests or mature pinewoods. Urban environments in Teneriffe are very permeable to native bird fauna, as they have been occupied by many widespread endemic species/subspecies. Many of the endemic, well defined species or subspecies of island birds have high population densities within native, untransformed habitats. Density compensation and niche expansion is not a common phenomenon in the avifauna of Teneriffe. Nevertheless, all species/subspecies broadening the inter–habitat or altitudinal distribution are endemic of the Canary Islands.
Pronombres de retoma en cláusulas relativas del castellano peruano: un fenómeno de causación múltiple
álvaro Cerrón-Palomino López
Lexis , 2006,
Abstract: El articulo no presenta resumen
Fundamentos ecológicos y biogeográficos de la rareza de la avifauna madrile a: Una propuesta de modificación del catálogo regional de especies amenazadas
Carrascal, L. M.,Palomino, D.,Seoane, J.
Graellsia , 2006,
Abstract: The conservation status of bird species of Comunidad de Madrid is analysed using the ecological breadth of the species, the distribution area, their habitat preferences, and maximum ecological densities in the region. The species which are less widely distributed in Madrid are characterized by their low maximum ecological densities, narrow habitat breadths, and limited distribution in the Iberian peninsular. Another component defining regional rarity shows that large-sized species tend to reach lower densities than small-sized birds. These two gradients of ecological rarity are closely associated with the current categories of threat status in Madrid, and allow the proposal and justification of possible modifications of the regional catalogue for 11 species. Se analiza el estatus de conservación de todas las Aves de la Comunidad de Madrid utilizando parámetros ecológicos asociados con la valencia ecológica de las especies, la extensión de su área de distribución, sus preferencias de hábitat y las densidades máximas ecológicas en la región. Las especies menos ampliamente distribuidas en la C.A. de Madrid se caracterizan por sus bajas densidades ecológicas máximas, y por ocupar menor variedad de hábitats y tienen una distribución muy restringida a escala peninsular. Otra componente de la rareza regional se relaciona directamente con la talla corporal, de manera que las especies de mayor tama o tienden a alcanzar menores densidades que las especies más peque as. Estos dos gradientes de rareza ecológica se asocian estrechamente con las actuales categorías oficiales de amenaza de las aves de Madrid, y permiten proponer y justificar posibles modificaciones al Catálogo regional para 11 especies (Cuchara Común – ‘De Interés Especial’; Calamón Común – ‘De Interés Especial’; Alcaraván Común – ‘Sensible a la Alteración de su Hábitat’; Paloma Zurita – ‘De Interés Especial’; Torcecuello Euroasiático – ‘Sensible a la Alteración de su Hábitat’; Calandria – descatalogarla; Mirlo Acuático - ‘Sensible a la Alteración de su Hábitat’; Colirrojo Real - ‘Sensible a la Alteración de su Hábitat’ o ‘Vulnerable’; Papamoscas Gris - ‘De Interés Especial’; Alcaudón Real Meridional – descatalogarla; Picogordo – ‘De Interés Especial’).
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