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Search Results: 1 - 10 of 339860 matches for " E. N. Honorio Coronado "
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Integrating regional and continental scale comparisons of tree composition in Amazonian terra firme forests
E. N. Honorio Coronado,T. R. Baker,O. L. Phillips,N. C. A. Pitman
Biogeosciences Discussions , 2009,
Abstract: We contrast regional and continental-scale comparisons of the floristic composition of terra firme forest in South Amazonia, using 55 plots across Amazonia and a subset of 30 plots from northern Peru and Ecuador. Firstly, we examine the floristic patterns using both genus- or species-level data and find that the species-level analysis more clearly distinguishes different plot clusters. Secondly, we compare the patterns and causes of floristic differences at regional and continental scales. At a continental scale, ordination analysis shows that species of Lecythidaceae and Sapotaceae are gradually replaced by species of Arecaceae and Myristicaceae from eastern to western Amazonia. These floristic gradients are correlated with gradients in soil fertility and to dry season length, similar to previous studies. At a regional scale, similar patterns are found within north-western Amazonia, where differences in soil fertility distinguish plots where species of Lecythidaceae, characteristic of poor soils, are gradually replaced by species of Myristicaceae on richer soils. The main coordinate of this regional-scale ordination correlates mainly with concentrations of available calcium and magnesium. Thirdly, we ask at a regional scale within north-western Amazonia, whether soil fertility or other distance dependent processes are more important for determining variation in floristic composition. A Mantel test indicates that both soils and geographical distance have a similar and significant role in determining floristic similarity across this region. Overall, these results suggest that regional-scale variation in floristic composition can rival continental scale differences within Amazonian terra firme forests, and that variation in floristic composition at both scales is dependent on a range of processes that include both habitat specialisation related to edaphic conditions and other distance-dependent processes. To fully account for regional scale variation in continental studies of floristic composition, future floristic studies should focus on forest types poorly represented at regional scales in current datasets such as terra firme forests with high soil fertility from north-western Amazonia.
Multi-scale comparisons of tree composition in Amazonian terra firme forests
E. N. Honorio Coronado,T. R. Baker,O. L. Phillips,N. C. A. Pitman
Biogeosciences (BG) & Discussions (BGD) , 2009,
Abstract: We explored the floristic composition of terra firme forests across Amazonia using 55 plots. Firstly, we examined the floristic patterns using both genus- and species-level data and found that the species-level analysis more clearly distinguishes among forests. Next, we compared the variation in plot floristic composition at regional- and continental-scales, and found that average among-pair floristic similarity and its decay with distance behave similarly at regional- and continental-scales. Nevertheless, geographical distance had different effects on floristic similarity within regions at distances <100 km, where north-western and south-western Amazonian regions showed greater floristic variation than plots of central and eastern Amazonia. Finally, we quantified the role of environmental factors and geographical distance for determining variation in floristic composition. A partial Mantel test indicated that while geographical distance appeared to be more important at continental scales, soil fertility was crucial at regional scales within western Amazonia, where areas with similar soil conditions were more likely to share a high number of species. Overall, these results suggest that regional-scale variation in floristic composition can rival continental-scale differences within Amazonian terra firme forests, and that variation in floristic composition at both scales is influenced by geographical distance and environmental factors, such as climate and soil fertility. To fully account for regional-scale variation in continental studies of floristic composition, future floristic studies should focus on forest types poorly represented at regional scales in current datasets, such as terra firme forests with high soil fertility in north-western Amazonia.
Multi-scale comparisons of tree composition in Amazonian terra firme forests
E. N. Honorio Coronado, T. R. Baker, O. L. Phillips, N. C. A. Pitman, R. T. Pennington, R. Vásquez Martínez, A. Monteagudo, H. Mogollón, N. Dávila Cardozo, M. Ríos, R. García-Villacorta, E. Valderrama, M. Ahuite, I. Huamantupa, D. A. Neill, W. F. Laurance, H. E. M. Nascimento, S. Soares de Almeida, T. J. Killeen, L. Arroyo, P. Nú ez,L. Freitas Alvarado
Biogeosciences (BG) & Discussions (BGD) , 2009,
Abstract: We explored the floristic composition of terra firme forests across Amazonia using 55 plots. Firstly, we examined the floristic patterns using both genus- and species-level data and found that the species-level analysis more clearly distinguishes among forests. Next, we compared the variation in plot floristic composition at regional- and continental-scales, and found that average among-pair floristic similarity and its decay with distance behave similarly at regional- and continental-scales. Nevertheless, geographical distance had different effects on floristic similarity within regions at distances <100 km, where north-western and south-western Amazonian regions showed greater floristic variation than plots of central and eastern Amazonia. Finally, we quantified the role of environmental factors and geographical distance for determining variation in floristic composition. A partial Mantel test indicated that while geographical distance appeared to be more important at continental scales, soil fertility was crucial at regional scales within western Amazonia, where areas with similar soil conditions were more likely to share a high number of species. Overall, these results suggest that regional-scale variation in floristic composition can rival continental-scale differences within Amazonian terra firme forests, and that variation in floristic composition at both scales is influenced by geographical distance and environmental factors, such as climate and soil fertility. To fully account for regional-scale variation in continental studies of floristic composition, future floristic studies should focus on forest types poorly represented at regional scales in current datasets, such as terra firme forests with high soil fertility in north-western Amazonia.
De la publicación de la fotografía a la fotografía publicada: en torno a los orígenes decimonónicos de la fotografía publicitaria
Diego Coronado e Hijón
Revista Latina de Comunicación Social , 2000,
Abstract: El desarrollo de la fotografía decimonónica está claramente afianzado en los manuales de fotografía en torno a un discurso documental, informativo o periodístico, pero casi nunca unido al discurso publicitario. Sin embargo, si la publicidad surge a mediados del siglo XIX, paralelamente al discurrir gestacional de la imagen fotográfica, por qué no podemos hablar de una fotopublicidad decimonónica. El reto que nosotros aquí nos hemos propuesto se centra, entonces, en rastrear las bases estéticas, tecnológicas e ideológicas de un supuesto desarrollo foto-publicitario puesto al descubierto ya a lo largo del siglo XIX; es decir, desde el primer momento en que se produce el encuentro conjunto entre la fotografía y la publicidad.
Basin-wide variations in Amazon forest structure and function are mediated by both soils and climate
C. A. Quesada, O. L. Phillips, M. Schwarz, C. I. Czimczik, T. R. Baker, S. Pati o, , N. M. Fyllas, M. G. Hodnett, R. Herrera, S. Almeida, , E. Alvarez Dávila, A. Arneth, L. Arroyo, K. J. Chao, N. Dezzeo, T. Erwin, A. di Fiore, N. Higuchi, E. Honorio Coronado, E. M. Jimenez, T. Killeen, A. T. Lezama, G. Lloyd, G. López-González, F. J. Luiz o, Y. Malhi, A. Monteagudo, D. A. Neill, P. Nú ez Vargas, R. Paiva, J. Peacock, M. C. Pe uela, A. Pe a Cruz, N. Pitman, N. Priante Filho, A. Prieto, H. Ramírez, A. Rudas, R. Salom o, A. J. B. Santos, , J. Schmerler, N. Silva, M. Silveira, R. Vásquez, I. Vieira, J. Terborgh,J. Lloyd
Biogeosciences (BG) & Discussions (BGD) , 2012,
Abstract: Forest structure and dynamics vary across the Amazon Basin in an east-west gradient coincident with variations in soil fertility and geology. This has resulted in the hypothesis that soil fertility may play an important role in explaining Basin-wide variations in forest biomass, growth and stem turnover rates. Soil samples were collected in a total of 59 different forest plots across the Amazon Basin and analysed for exchangeable cations, carbon, nitrogen and pH, with several phosphorus fractions of likely different plant availability also quantified. Physical properties were additionally examined and an index of soil physical quality developed. Bivariate relationships of soil and climatic properties with above-ground wood productivity, stand-level tree turnover rates, above-ground wood biomass and wood density were first examined with multivariate regression models then applied. Both forms of analysis were undertaken with and without considerations regarding the underlying spatial structure of the dataset. Despite the presence of autocorrelated spatial structures complicating many analyses, forest structure and dynamics were found to be strongly and quantitatively related to edaphic as well as climatic conditions. Basin-wide differences in stand-level turnover rates are mostly influenced by soil physical properties with variations in rates of coarse wood production mostly related to soil phosphorus status. Total soil P was a better predictor of wood production rates than any of the fractionated organic- or inorganic-P pools. This suggests that it is not only the immediately available P forms, but probably the entire soil phosphorus pool that is interacting with forest growth on longer timescales. A role for soil potassium in modulating Amazon forest dynamics through its effects on stand-level wood density was also detected. Taking this into account, otherwise enigmatic variations in stand-level biomass across the Basin were then accounted for through the interacting effects of soil physical and chemical properties with climate. A hypothesis of self-maintaining forest dynamic feedback mechanisms initiated by edaphic conditions is proposed. It is further suggested that this is a major factor determining endogenous disturbance levels, species composition, and forest productivity across the Amazon Basin.
Composición en ácidos grasos de la fracción lipídica del tocosh de maíz
Durand, Z. Honorio,Coll Hellín, L.,Torija Isasa, M. E.
Grasas y Aceites , 1994, DOI: 10.3989/gya.1994.v45.i6.1033
Abstract: Corn's tocosh is a food consumed by children and adults in the andine region of Callejón de Huaylas in Peru, Germination and fermentation phenomena produced during its elaboration contribute to modify the chemical composition of the original corn; that is the case of the fatty acids in the lipidic fraction. The analytical data of the corn's tocosh, show the presence of trans isomers in non significant amount, an increase in linoleic acid related to the time of fermentation, and the presence of gamma linolenic acid. El tocosh de maíz es un alimento consumido por adultos y ni os de la región andina del Callejón de Huaylas del Perú. Los fenómenos de germinación y fermentación que se producen durante su elaboración aseguran cambios en la composición química del maíz original; tal es el caso de los ácidos grasos de la fracción lipídica. Los resultados del análisis del tocosh de maíz, muestran la presencia de isómeros trans en cantidades no significativas, un incremento del ácido graso esencial linoleico en función del tiempo de fermentación y la presencia del ácido gamma linolénico.
SECAFé Parte I: modelamiento y simulación matemática en el secado mecánico de café pergamino
Parra-Coronado, Alfonso;Roa-Mejía, Gonzalo;Oliveros-Tascón, Carlos E.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2008, DOI: 10.1590/S1415-43662008000400013
Abstract: a microsoft visual basic 6.0 parchment coffee drying program was implemented. two separate programs, based on the thompson and michigan state university (msu) models, using cenicafé coffee parameters, were successfully tested for the evaluation of the performance of all mechanical coffee dryers existing in colombia. the results obtained by means of simulation for each one of the dryers were compared with the experimental results obtained in cenicafé, resulting in the conclusion that these suitably predict the drying of the coffee parchment. based on the good results obtained, a unique simulation program was implemented for drying parchment coffee.
SECAFé Parte II: recomendaciones para el manejo eficiente de los secadores mecánicos de café pergamino
Parra-Coronado, Alfonso;Roa-Mejía, Gonzalo;Oliveros-Tascón, Carlos E.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2008, DOI: 10.1590/S1415-43662008000400014
Abstract: a microsoft visual basic 6.0 parchment coffee drying program was developed. two separate programs, based on thompson and msu models and using cenicafé's coffee parameters were successfully tested for the evaluation of the performance of all mechanical coffee dryers existing in colombia. based on the good results, a unique simulation program was implemented for drying parchment coffee and used to determine the most adequate ways to operate each one of the existing mechanical dryers and to give the necessary recommendations for their most efficient operation with the purpose of obtaining dry parchment coffee with final water content between 10 and 12% wb, and to predict the drying time, the thermal efficiency and the behavior of the grain during the drying. 753 tests of simulation were made altogether, which corresponds to an average of 151 simulations by each type of dryer.
Abstract
S. Comellas Cruzado,I. Barragán Gómez-Coronado,E. Cortijo álvarez
Medicina Intensiva , 2007,
Abstract:
Diagnosis of pulmonary and extrapulmonary tuberculosis using an in-house PCR method in clinical samples from a middle-income resource setting
Coronado-Ríos,Sandra; Arenas-Suárez,Nelson E; Gómez-Marín,Jorge E;
Infectio , 2011,
Abstract: introduction: pcr detection offers a good opportunity to obtain fast results which is a priority in tuberculosis control programs. objectives: we assayed an in-house pcr method based on the detection of mycobaterial is6110 gene in clinical samples of patients with pulmonary and extrapulmonary tuberculosis to demonstrate its usefulness and reliability in the setting of a middle-resource region with high tuberculosis prevalence. materials and methods: pulmonary (n=317) and extrapulmonary (n=41) samples were collected from 358 patients with clinical suspicion of tuberculosis. all samples were processed to detect acid-fast bacilli by microscopy, culture on solid media and pcr. to remove pcr inhibitors, three washing steps of the decontaminated pellet were included before mycobacterial cell lysis. results: the overall sensitivity was 96% in clinical samples, and specificity was 100% for our in-house method in pulmonary and extrapulmonary samples. no inhibition was found among samples that were pcr negative, but culture positive for mycobacterium tuberculosis. no false positives were found. conclusions: in-house pcr in a middle-income setting region, with simple and strictly controlled methods, could efficiently complement conventional bacteriological tools for the rapid diagnosis of tuberculosis, especially in paucibacillary and extrapulmonary samples.
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