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Search Results: 1 - 10 of 382046 matches for " C. López "
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El espacio y la gente: la dinámica sociodemográfica de la población del Tucumán tardo y poscolonial
López,C;
Andes , 2006,
Abstract: the historiography of the last decades has made use of data on population in order to interpret socio-economic, historical, and cultural processes. because of this, dealing with population numbers becomes a reciprocal relationship that explains the transformations as mutually dependent ones. the purpose of this work is to present a "chart" of the population of tucumán during the late eighteenth and first half of the nineteenth centuries, along with the findings of some situations still unresolved by the historiography. the aim is to get access to a better comprehension of the population from these last perspectives. for this purpose, we make a historiographical balance taking into account not only their contribution from the demographic point of view, but also the controversial issue of the sources, the use of semantic categories, and the creation of new analytic tools.
Dimorfismo y patogenia de Histoplasma capsulatum
López,C. E.;
Revista argentina de microbiolog?-a , 2006,
Abstract: histoplasma capsulatum is a dimorphic fungal pathogen with worldwide significance, which causes a broad spectrum of disease. in the saprophytic stage, it lives as a mycelial form consisting of hyphae bearing both macro and microconidia. infection with h. capsulatum occurs by inhalation of microconidia (1-4 x 2-6 μm) or small mycelia fragments (5-8 μm) in the terminal bronchioles and alveoli of the lung. inhaled conidia then convert into the yeast form that is responsible for the pathogenesis of histoplasmosis. as a soil fungus with no known requirements for interacting with a mammalian host as a necessary stage of its life cycle, the number of its strategies for successful pathogenesis is particularly remarkable. they include dimorphic mould-yeast transition, entry into host macrophages, subcellular localization, intracellular survival and proliferation during clinically unapparent infection with capacity for reactivation. h. capsulatum became the subject of increasing studies concurrently with the rising prevalence of human immunodeficiency. this paper presents an overall view of advances in the investigation of h. capsulatum dimorphic transition and pathogenesis.
“Prosperidad y violencia. Economía política del desarrollo”
Fernando López C.
Revista de Economía Institucional , 2010,
Abstract:
Dimorfismo y patogenia de Histoplasma capsulatum Dimorphism and pathogenesis of Histoplasma capsulatum
C. E. López
Revista argentina de microbiolog?-a , 2006,
Abstract: Histoplasma capsulatum es un hongo patógeno dimorfo de importancia en todo el mundo, que causa un amplio espectro de enfermedades. Vive en estado saprobio en fase micelial, presentando hifas con dos tipos de conidios solitarios, macro y microconidias. La infección con H. capsulatum se inicia por vía respiratoria con la inhalación de propágulos fúngicos, constituidos principalmente por microconidios de 1-4 x 2-6 μm o de fragmentos hifales de 5 a 8 μm, que llegan a los bronquiolos terminales y alvéolos pulmonares. Los propágulos inhalados se convierten entonces a la fase levaduriforme, responsable de la patogénesis del H. capsulatum. Por ser un hongo del suelo sin requerimientos conocidos para interactuar con un hospedador mamífero como parte del ciclo de vida obligado, sus estrategias de patogénesis son particularmente notables. Entre éstas se incluyen la transición dimorfa micelio-levadura, entrada en las células fagocíticas del hospedador, localización subcelular, supervivencia y proliferación intracelular durante la infección activa y persistencia durante la infección clínicamente inaparente, con capacidad de reactivación. La patogénesis de H. capsulatum fue estudiada ampliamente a partir del aumento de pacientes inmunosuprimidos. Esta publicación presenta un resumen de los avances realizados en las investigaciones del dimorfismo y la patogénesis de H. capsulatum. Histoplasma capsulatum is a dimorphic fungal pathogen with worldwide significance, which causes a broad spectrum of disease. In the saprophytic stage, it lives as a mycelial form consisting of hyphae bearing both macro and microconidia. Infection with H. capsulatum occurs by inhalation of microconidia (1-4 x 2-6 μm) or small mycelia fragments (5-8 μm) in the terminal bronchioles and alveoli of the lung. Inhaled conidia then convert into the yeast form that is responsible for the pathogenesis of histoplasmosis. As a soil fungus with no known requirements for interacting with a mammalian host as a necessary stage of its life cycle, the number of its strategies for successful pathogenesis is particularly remarkable. They include dimorphic mould-yeast transition, entry into host macrophages, subcellular localization, intracellular survival and proliferation during clinically unapparent infection with capacity for reactivation. H. capsulatum became the subject of increasing studies concurrently with the rising prevalence of human immunodeficiency. This paper presents an overall view of advances in the investigation of H. capsulatum dimorphic transition and pathogenesis.
Analysis of the Temporal and Spatial Evolution of Recovery and Degradation Processes in Vegetated Areas Using a Time Series of Landsat TM Images (1986-2011): Central Region of Chihuahua, Mexico  [PDF]
L. C. Alatorre, E. Sánchez, J. P. Amado, L. C. Wiebe, M. E. Torres, H. L. Rojas, L. C. Bravo, E. López, E. López
Open Journal of Forestry (OJF) , 2015, DOI: 10.4236/ojf.2015.52016
Abstract: This paper analyzed the temporal and spatial evolution of vegetation dynamics in various land covers in the basin of the Laguna Bustillos, Region of Cuauhtémoc, Chihuahua, Mexico. We used an NDVI time series for the months of March to April (early spring). The series was constructed from Landsat TM images for the period 1986-2011. The results show an increase of NDVI for vegetated areas, especially in conifer cover, while shrub and grassland showed a positive trend but with lower statistical significance. The increase in minimum temperatures in early spring, during the study period, was the most important factor in explaining the increase of NDVI in vegetated areas. A spatially distributed analysis shows large areas without an NDVI trend, corresponding to areas with sparse vegetation cover (degraded areas). Moreover, there are also areas with a negative trend (loss of vegetation), explained by the exploitation of trees to produce firewood which is mainly carried out by the ejidos in the region. These results help to focus human and financial resources in places where the benefit will be greatest.
Toxicity and feeding response of adult corn earworm (Lepidoptera: Noctuidae) to an organic spinosad formulation in sucrose solution  [PDF]
Juan D. López, Mohamed A. Latheef, Wesley C. Hoffmann
Advances in Entomology (AE) , 2014, DOI: 10.4236/ae.2014.21006
Abstract: Adult corn earworm, Helicoverpa zea (Boddie), feeds on plant exudates soon after emergence from pupa in their natural habitat, and thereafter disperses to suitable host plants for reproduction. The intent of this study was to determine if EntrustTM, an organic formulation of spinosad, could be used in a behavioral-based pest management strategy to control H. zea in organic farming systems. In the laboratory, we evaluated the response of the corn earworm to Entrust mixed with sugar solution relative to ingestion, toxicity and proboscis extension. The sucrose solution served as a feeding stimulant and simulated the plant exudate. Lethal concentration of Entrust (LC50 with 95% CLs) for male corn earworm captured in pheromone-baited traps was 0.48 (0.43 - 0.53) mgL-1 for 24 h response. Mean lethal time was 2.56 ± 0.13 h with ingestion of Entrust at 50 mg·L-1. A lethal dose of Entrust at 1000 mg·L-1 inhibited neither ingestion nor proboscis extension response of the insect. A detailed study of the adult corn earworm in the laboratory relative to toxicity after ingestion of Entrust indicates that the pesticide has potential to control the insect when used in an insecticidal bait formulation as part of an attract-and- kill system. Field studies are needed to support the conclusion.
Tendinopatía del tendón flexor digital superficial y desmopatía del ligamento suspensorio en caballos: fisiopatología y terapias regenerativas
Carmona,JU; López,C;
Archivos de medicina veterinaria , 2011, DOI: 10.4067/S0301-732X2011000300002
Abstract: tendon and ligament injuries are frequent in horses. the superficial digital flexor tendon (sdft) and the suspensory ligament (sl) are the most frequently affected structures. the clinical form of these pathologies is generally chronic and degenerative. the treatments commonly used do not result in a definitive cure of the problem and most of the patients relapse or do not recover their initial athletic capacity. advances in molecular pathophysiology of tendonitis and desmitis in man, horses and other animals have shown the presence of catabolic cytokines, which are possibly responsible for the general dysfunction observed in these pathologies. the current objectives of the treatments of these problems are the regeneration and not the repair (scar formation) of the injured tissue. in the horse, novel experimental and clinical treatments have been described. these treatments include the injection of bone marrow aspirates, mesenchymal stem cells, recombinant growth factors such as insulin-like and platelet rich plasma (also termed autologous platelet concentrates), amongst others. the observed results have been promising when these novel therapies were used. however, just as with other treatments, further research is needed to demonstrate that its clinical use can be effective and safe in horses.
Ensayo filosófico sobre educación superior y humanismo
Córdova López,Edgardo;
Revista de Ciencias Sociales , 2009,
Abstract: higher education, as an essential premise for the cultural, social and scientific development of a country, can be a determining factor for achieving the goal of one day living in a just and free society. the great pedagogues and philosophers are remembered as ingenuous idealists who are not worth listening to and few people think about the possibility that they have really offered keys for the growth of our society. what is at stake is not only individual and collective well-being, but the future of the civilization and the continuity of the human race, since a conscious person can reach great achievements and impact the well-being of the others thanks to a true humanism, whereas a mediocre person can detain his own development and that of society if he does not channel his efforts well. that is why education must be considered as a strategic action for undertaking any elevated goal that is worthy of being reached, whether through an ethical-spiritual curriculum or through a process of systematic innovation in the current curriculum.
Efecto in vitro de olomoucina en el ciclo celular de linfocitos humanos
López C.,Camargo M.
Acta Biológica Colombiana , 2001,
Abstract: La olomoucina, un derivado de purina relacionado con el ATP, ha sido reportado como uneficiente inhibidor del ciclo celular de células animales y vegetales, debido a su alta especificidadpor las ciclinas dependientes de kinasa (CDK) CDK1 y CDK2, su capacidad radica en inhibir elciclo celular en las transiciones G2/M y G1/S respectivamente. Con el objetivo de explorar lapotencial aplicación de la olomoucina en el análisis citogenético de alta resolución y estudiosde proliferación celular en cultivos primarios, linfocitos humanos fueron cultivados en RPMI1640 suplementado con suero bovino fetal al 5%, estimuladas durante 72 horas con PHA yposteriormente tratadas con concentraciones de 50, 100 y 200 mM durante 12 y 24 horas.
Effect of lightweight aggregate intrinsic Strength on lightweight concrete compressive strength and modulus of elasticity
Videla, C.,López, M.
Materiales de Construccion , 2002,
Abstract: The study of Structural Lightweight Concrete (SLC), which is a material generally composed of cement, water and lightweight aggregate, has been mainly focused on developing particular cases. Then, the main objective of this research was to generalise the knowledge of this type of material. Particularly, the effect of replacing conventional coarse aggregate by lightweight aggregate on mechanical properties of concrete was studied. SLC may be conceived as a two -phase material. The first phase, composed of cement, water and siliceous natural sand, is called the "resistant phase", and contributes to the structural strength. The second phase is the lightweight phase, comprised of coarse lightweight aggregate, and it is meant to decrease the concrete density. In this way it would be possible to describe the mechanical behaviour of concrete, based on lightweight aggregate and the cement mortar parameters. The obtained results allow for the proposition of relationships between mechanical properties of SLC (such as compressive strength and modulus of elasticity) and the constituent materials properties and amount. At the same time, an easily measured index representing the structural capability of lightweight aggregate is also proposed, this index allows to estimate the potential mechanical properties of concrete which could be obtained by using a particular aggregate. El estudio del Hormigón Ligero Estructural (HLE), material compuesto generalmente por cemento, agua y árido ligero, ha estado enfocado principalmente al desarrollo de casos particulares. Por lo anterior, el objetivo principal de esta investigación fue generalizar el conocimiento sobre este material. En particular, la meta de este trabajo fue estudiar el efecto que tiene el reemplazo de árido convencional por un árido ligero, en las propiedades mecánicas del hormigón. El modelo aplicado conceptualiza al HLE como un material de dos fases, una denominada "soportante", constituida por pasta de cemento más arena normal y otra "ligera", formada por árido grueso ligero. La primera aporta la resistencia estructural y la segunda disminuye la densidad del hormigón. De esta forma sería posible describir el comportamiento mecánico del hormigón en función de parámetros del árido ligero y del mortero de cemento. A partir de los resultados se proponen relaciones entre las propiedades mecánicas del HLE (resistencia a compresión y rigidez) y las propiedades y cantidad de los materiales constituyentes. Asimismo, se propone un índice para caracterizar la capacidad estructural del árido ligero, que es de fácil medic
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