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Search Results: 1 - 10 of 228939 matches for " Correa Camila R "
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Increased production of hydrogen peroxide by peripheral blood monocytes associated with smoking exposure intensity in smokers
Tanni Suzana E,Correa Camila R,Angeleli Aparecida Y,Vale Simone A
Journal of Inflammation , 2012, DOI: 10.1186/1476-9255-9-45
Abstract: Background Smoking is known to be associated with oxidative stress; however, it has not been elucidated whether the oxidative response is influenced by the intensity of smoking exposure. Objectives Evaluate the effect of smoking exposure on the secretion of hydrogen peroxide (H2O2) by the peripheral blood monocytes of smokers. Methods A total of 25 smokers (50.3±8.8 years, 48% male) underwent the following evaluations: spirometry, pulse oximetry, body composition and total peripheral blood count. Peripheral blood monocyte (PBM) cultures were isolated and maintained, and IL-6 and TNF-α were measured in the plasma and in the supernatants of spontaneous and stimulated cultures. H2O2 was evaluated in the supernatants of the PBM cultures, and a subset of the PBM culture supernatants was stimulated with phorbol myristate acetate (PMA). We also evaluated 38 healthy controls (49.1±8.2 years, 42% male). Results The spontaneous and stimulated monocytes’ secretion of H2O2 were statistically higher in the smokers than in the healthy controls (p<0.001). The H2O2 secretions were statistically significant higher after stimulation with PMA in both groups (p<0.001). In the multiple regression analysis, we identified a positive, statistically significant association between pack-years of smoking and the spontaneous secretion of H2O2 by PBM culture, adjusted for potential confounding variables. The association between PBM culture secretion of H2O2 and the production of TNF-α and IL-6 was not significant. Conclusion We identified a positive association between higher production of H2O2 in smokers and higher smoking exposure during life. The influence of pack-years smoking may be a key modifiable factor in oxidative stress associated to smoking.
The accretion history of dark matter halos I: The physical origin of the universal function
Camila A. Correa,J. Stuart B. Wyithe,Joop Schaye,Alan R. Duffy
Physics , 2014, DOI: 10.1093/mnras/stv689
Abstract: Understanding the universal accretion history of dark matter halos is the first step towards determining the origin of their structure. We use the extended Press-Schechter formalism to derive the halo mass accretion history from the growth rate of initial density perturbations. We show that the halo mass history is well described by an exponential function of redshift in the high-redshift regime. However, in the low-redshift regime the mass history follows a power law because the growth of density perturbations is halted in the dark energy dominated era due to the accelerated expansion of the Universe. We provide an analytic model that follows the expression $M(z) = M_{0}(1+z)^{af(M_{0})}e^{-f(M_{0})z}$, where $M_{0} = M(z=0)$, $a$ depends on cosmology and $f(M_{0})$ depends only on the linear matter power spectrum. The analytic model does not rely on calibration against numerical simulations and is suitable for any cosmology. We compare our model with the latest empirical models for the mass accretion history in the literature and find very good agreement. We provide numerical routines for the model online.
Preliminary Tests of a Kerma-Area Product (KAP) Meter to Be Used as a Monitor Chamber in a Conventional Diagnostic X Ray System  [PDF]
Eduardo Correa, Regina Medeiros, Maria da Penha Potiens, Vitor Vivolo, Nathalia Costa, Camila Murata, Cristina Kikuti
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.64052
Abstract: This study presents the results of the preliminary tests performed using a kerma-area product (KAP) meter in order to verify its usefulness as a monitor chamber in a clinical X ray system, which will be used in ionization chambers’ quality control program. The tests performed were repeatability, surface measurement uniformity, linearity with tube current, measurement variation changing the distance and field size, KAP chamber radiation attenuation, and energy dependence. The KAP meter has presented a good repeatability (a maximum variation of 0.4%); its surface has a homogeneous response (a maximum variation of 1.0% among the different irradiated regions); the response is linear with the tube current and the variation of the PKA along the distance is less than 3.43%. On the other hand, the results obtained for chamber attenuation and energy dependence show that some corrections must be applied when the measurements are made. The results have shown a good performance of the KAP meter, confirming that it is possible to use this instrument as a monitor chamber. However, it is important to highlight that some correction factors for energy dependence and chamber radiation attenuation must be considered.
Comunicación: lobby y asuntos públicos
Correa Ríos,Enrique;
Cuadernos del Centro de Estudios en Dise?±o y Comunicaci?3n. Ensayos , 2010,
Abstract: in the present article the author refects about lobby, its evolution and its professional exercise, deepening about his status in the world and specifically in latin america. si-multaneously, he defines lobby activities as a professional work framed into the wider scenario of strategic communications, which is oriented to establish harmonic relations of long term between public decision makers and the private economy sector. he refers the application of a varied range of diagnosis techniques, construction of scenarios, identification of messages, design of profles of actors who correspond to the infuence of the professional of communica-tions and public relations people. the author identify experts in communication like facilita-tors in making compatible public and private interest, since their knowledge about market and public policies, contribute to the construction of bridges between worlds of logics and often distant cultures.
Correa R.,Juan Santiago;
Revista de Economía Institucional , 2009,
Abstract: this article shows, from an economic history perspective, the changes in the colombian monetary policy brought about by ?la regeneración" (conservative regime) from 1880. the new political model replaced the decentralization policies, pursued by radicals in the previous decades, with a very centralized economic policy model, which marked by profound irregularities, that led to a major civil war (guerra de los mil dias).
Correa R.,Juan Santiago;
Revista de Economía Institucional , 2009,
Abstract: this article analyses the development of the colombian monetary and banking system between 1850 and 1880. the political debate and the power struggle at the national level determined the economic model of this period. beyond its technical feasibility, the economic decisions were influenced by the concept of nation that each group wanted to impose.
Historia para dummies: una mirada colonial a la historia imperial
Correa R., Juan Santiago
Revista de Economía Institucional , 2006,
El Kiosco de la Luz en el Centenario de la Independencia
Juan Santiago Correa R.
Revista de Economía Institucional , 2010,
Del Radicalismo a La Regeneración. La cuestión monetaria (1880-1903)
Juan Santiago Correa R.
Revista de Economía Institucional , 2009,
Abstract: Este trabajo de historia económica analiza los cambios en la política monetaria colombiana que efectuó La Regeneración desde 1880. El nuevo régimen sustituyó la política de descentralización que siguieron los Radicales en las décadas anteriores por un modelo centralizado de política económica, marcado por profundas irregularidades, que fueron parte de las causas de la Guerra de los Mil Días.
árboles de Juegos
Becerra Correa Nelson R.
Ingeniería e Investigación , 2000,
Abstract: El presente artículo hace una descripción sobre los árboles de juegos, se presentan los conceptos básicos y se reportan los resultados de un trabajo de investigación sobre el procedimiento minimax con corte alfa-beta aplicado a dichos árboles.
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