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Search Results: 1 - 10 of 326829 matches for " Germán H; "
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Ganancias de competitividad: un enfoque agregado y de largo plazo
Germán H. González
Análisis Económico , 2009,
Abstract: El artículo ofrece un modelo de ganancias de competitividad alternativo a los enfoques de corto plazo, basado en la teoría de crecimiento y enfatizando el rol de la productividad multifactorial en la determinación del perfil competitivo de una economía en el plano internacional. Se presenta además un indicador de ganancias de competitividad teóricamente fundamentado y una evaluación de la bondad de ajuste de las predicciones del modelo utilizando dos paneles de datos de países desarrollados y en vías de desarrollo.
Efficient sampling of ground-dwelling arthropods using pitfall traps in arid steppes
Cheli, Germán H;Corley, Juan C;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000600010
Abstract: pitfall trapping is probably the most frequently used method for sampling grounddwelling arthropods. while the capture of specimens in pitfall traps largely depends on the number of individuals in the sampled area, trap design and trapping effort for a given environment, can also affect sampling success. the aim of this study was to determine the best pitfall trapping design for collecting ground-dwelling arthropods in the wind-blown and cold arid steppe areas of patagonia. we tested four designs of traps, six types of preservative and different times of activation as well as the quantity of traps. both preservation attributes and sampling efficiency differed between different trap designs and fluids compared. we conclude that in order to obtain reliable data on the structure of a community of ground-dwelling arthropods in patagonia, at least three pitfall traps per experimental unit are required. in addition, traps should be opened for a minimum of 10 days filled with 300 ml of 30% ethylene glycol. we also suggested the use of a simple trap design (i. e. without funnel or roof). we believe these findings will contribute to more appropriate sampling of the ground dwelling fauna of patagonia as well as other arid areas, leading to more reliable diversity studies.
Implications of PSR J1614-2230 for NJL hybrid star
César H. Lenzi,Germán Lugones
Physics , 2013,
Abstract: The recent determination of the mass of the pulsar PSR J1614-2230 with $1.97 \pm 0.04 M_\odot$ by \cite{Demorest}, renewed the discussions about the possibility of exotic matter being present at the core of neutron stars. Since the description of matter at densities beyond nuclear saturation is model dependent, several works have explored different aspects of the fact that the maximum neutron star mass implied by any equation of state (EoS) must exceed the mass of PSR J1614-2230. In this article we present an extensive study of hybrid star masses using several parametrizations of a relativistic mean-field hadronic EoS together with a typical three-flavor NJL model with scalar, vector and 't Hooft interactions as realized.
Effect of Hydrogen in Adsorption and Direct Dissociation of CO on Fe (100) Surface: A DFT Study  [PDF]
Sebastián Amaya-Roncancio, Daniel Humberto Linares, Hélio Anderson Duarte, Germán Lener, Karim Sapag
American Journal of Analytical Chemistry (AJAC) , 2015, DOI: 10.4236/ajac.2015.61004
Abstract: Density functional theory was employed to investigate the effect of the hydrogen in the adsorption and direct dissociation of CO on Fe (100) surface. The preadsorption of hydrogen with coverages of 0, 1/3 and 2/3 monolayer (ML) was used in the present investigation. In the case of 1/3 ML of hydrogen, two configurations of adsorption were studied. The presence of hydrogen shows a major transference of electronic density from Fe surface to CO adsorbed, increasing the adsorption energy of CO from 2.00 eV in clean surface, to 2.76 eV in 2/3 ML of hydrogen. Furthermore, the activation barrier for direct dissociation of CO was 1.13 eV and for the recombination energy 2.28 eV on clean Fe (100) surface. In the same way, the activation barrier for CO in the presence of coadsorbed hydrogen was slightly affected presenting values of 1.06 eV and 1.16 eV to 1/3 ML configurations and 0.98 eV for 2/3 ML of hydrogen. Finally, the recombination energy decreases to 1.63 eV and 1.49 eV for 1/3 ML configurations and to 1.23 eV for 2/3 ML of coadsorbed hydrogen. These results indicate that the CO adsorption and dissociation are favored in the presence of hydrogenated surfaces.
Correlación entre exámenes solicitados en la consulta preanestésica y exámenes recomendados por SCARE, ASA Y NICE. Estudio de cohorte
Meléndez,Héctor Julio; Moreno,Germán; Arturo,Eduardo;
Revista Colombiana de Anestesiología , 2005,
Abstract: the request or revision of paraclinical laboratory tests are realized with the objetive to identify and prove or disprove pathologies that can affect the perioperative management of patients. it is also focused on the evaluation of the responses during treatment scheme and to formulate specific and alternative plans for the optimal management of the patient. however, this should never be considered as a sifting exercise. more than 60% of the tests requested can be avoided if they are ordered under indications. the probability of finding abnormal results in a healthy patient is low and only a low percentage reveals abnormalities that could affect the perioperative management. through a prospective cohort study, we intend to demonstrate the lack of correlation between the recommendations that scientific societies such as scare, asa and nice (national institute for the clinical excellence,uk) , and the presurgical tests. the research was done in a multicentric form, involving 900 patients. a very low correlation is found in the investigation: 38% for scare, 31% for nice and 28% for asa. this includes, an excess of tests request greater than or equal to 60% in minor procedures and in patients without associated diseases. an average of six tests per patient were recorded. regardless of reporting abnormalities in 22% of the exams (149 patients), this only influenced in the postponement of one procedure. the anesthesiologist contributed only in the 0.15% of the cases and in 97.97% this was in head of the treating physician. there were projected over cost of over $, therefore, it is necessary to share the recommendations amongst specialists as well as for anesthesiologists to exercise a more active role in this matter.
Manejo quirúrgico del reflujo gastroesofágico en la Universidad Nacional de Colombia, sede Bogotá
Hazbón,Héctor René; Junca-Burgos,Edgar Germ?an;
Revista Colombiana de Cirugía , 2011,
Abstract: in our environment gastroesophageal reflux disease remains a problem that is managed medically, while surgical intervention is not fostered, especially by gastroenterologists. patients are generally offered medical treatment, and the entity becomes chronic, while one could avoid the permanent prescription of medications with surgical intervention. this review is intended to indicate the manner for an early detection of patients with gastroesophageal reflux that can be benefitted from surgical correction.
Evaluación de predictores clínicos de bacteriemia en adultos hospitalizados por neumonía adquirida en la comunidad
Díaz Parodi,Germán Ignacio; Musacchio,Héctor Mario;
Revista Panamericana de Salud Pública , 2011, DOI: 10.1590/S1020-49892011000600002
Abstract: objective: identify simple clinical elements that can be used to adequately determine the cases with the highest probability of presenting bacterial isolates in blood cultures. methods: case-control study with patients hospitalized for community-acquired pneumonia from 1998-2009. patients with positive blood cultures were defined as cases, and patients with negative blood cultures were defined as controls. the demographic and clinical variables were recorded and a bivariate analysis was conducted. the variables with statistically significant differences between the groups were introduced in a logistic regression model in order to define the independent predictors and generate a clinical prediction model. results: a total of 15.2% of the 322 patients studied had positive blood cultures. ten variables showed significant differences, but only three variables (temperature <38°c, sodium <135 meq/l and curb-65 score) were selected for the multivariate analysis. the model developed showed limited capacity to predict the result of the blood cultures (r2 = 0.176; hosmer-lemeshow: p = 0.338). conclusions: the data obtained in this series did not demonstrate clinical elements with sufficient capacity to predict the result of the blood cultures.
Patrones biogeográficos de los tenebriónidos epigeos (Coleoptera: Tenebrionidae) del área Natural Protegida Península Valdés, Argentina: implicaciones para su conservación
Carrara, Rodolfo;Cheli, Germán H.;Flores, Gustavo E.;
Revista mexicana de biodiversidad , 2011,
Abstract: we conducted a study of the biogeographic patterns of epigean tenebrionids (coleoptera: tenebrionidae) that inhabit the protected natural area península valdés (chubut, argentina), based on data obtained from collections and collecting trips. we present a comprehensive species list, where we detail the degree of adaptation to aridity shown by each species, an analysis of the quality of the inventory, an estimation of total species richness, and an evaluation of distribution and richness patterns, with the identification of areas of significantly greater richness or "hotspots". the results indicated that 25 species with different degrees of adaptation to aridity inhabit the peninsula, although it was estimated that the total richness of the area should be 27 species. in addition, it was recognized that the species range sizes follow a log-normal distribution and that only three species are endemic. the spatial distribution of richness was aggregate within the peninsula and we can identify 10 "hotspots". finally, considering that in the península valdés are allowed productive activities that cause significant habitat degradation, we discuss the implicances that have these findings for epigean tenebrionids conservation.
Plásmido de virulencia en Yersinia enterocolitica O:3 de origen murino
Zamora B,Justo; Reinhardt V,Germán; Macías H,Pamela;
Revista médica de Chile , 1998, DOI: 10.4067/S0034-98871998000700006
Abstract: background: pathogenic strains of yersinia enterocolitica harbor a virulence plasmid of 45-48 megadalton that can be detected using different techniques. rodents are important reservoirs of y enterocolitica. aim: to investigate the carrier status of y enterocolitica in murine rodents. material and methods: two hundred sixty one mice and rats were captured in rural and urban areas of valdivia. y enterocolitica was cultured from viscera and fecal homogenates. virulence plasmids were detected using crystal violet binding. results: thirteen y enterocolitica strains were isolated from 11 rodents. ten strains belonged to the biotype 1 and three to the biotype 4, serotype o:3. the most frequently infected rodent species were r norvergicus (20%), followed by a longipilis (11%), a olivaceus (2%) and o longicaudatus (2%). conclusions: rodents, and specially the domestic rat, can be an important source of y enterocolitica infection for human and susceptible animal species.
Manejo quirúrgico del reflujo gastroesofágico en la Universidad Nacional de Colombia, sede Bogotá Management of gastroesophageal reflux at Universidad Nacional de Colombia, Bogotá
Héctor René Hazbón,Edgar Germ?an Junca-Burgos
Revista Colombiana de Cirugía , 2011,
Abstract: La enfermedad por reflujo gastroesofágico en nuestro medio es un problema que aún sigue siendo manejado médicamente y la ayuda quirúrgica no está siendo fomentada, principalmente por los gastroenterólogos clínicos. Se ofrece únicamente el manejo médico y se torna un problema crónico que podría solucionarse, evitando la administración permanente de medicamentos. Con esta revisión se busca indicar una manera eficaz para detectar al paciente con reflujo gastroesofágico, que puede beneficiarse de la cirugía para controlar su enfermedad. In our environment gastroesophageal reflux disease remains a problem that is managed medically, while surgical intervention is not fostered, especially by gastroenterologists. Patients are generally offered medical treatment, and the entity becomes chronic, while one could avoid the permanent prescription of medications with surgical intervention. This review is intended to indicate the manner for an early detection of patients with gastroesophageal reflux that can be benefitted from surgical correction.
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