Papers by LUIS F R A N C I S C O HERNÁNDEZ A.
Resumen La evaluación de los aprendizajes es un proceso que genera información comprensible permi... more Resumen La evaluación de los aprendizajes es un proceso que genera información comprensible permitiendo obtener un juicio de valor para la toma de decisiones sobre el aprendizaje de los estudiantes. En este sentido, el estudiante no se limita a adquirir conocimiento sino que lo construye. Así, el estudiante resulta mucho más activo e inventivo, y su papel corresponde al de un ser autónomo, autorregulado, que conoce sus propios procesos cognitivos y tiene en sus manos el control del aprendizaje. Esta investigación propone conocer las técnicas e instrumentos de evaluación que aplican los docentes en el proceso de enseñanza-aprehendizaje en las asignaturas pedagógicas en la
Colloidal Interactions in Partially Quenched Suspensions of Charged Particles
Physical Review Letters, 1998
... [13] WG Madden, J. Chem. Phys. 96, 5442 (1992). [14] JA Given and G. Stell, J. Chem. Phys. 97... more ... [13] WG Madden, J. Chem. Phys. 96, 5442 (1992). [14] JA Given and G. Stell, J. Chem. Phys. 97, 4573 (1992). [15] C. Vega, RD Kaminsky, and PA Monson, J. Chem. Phys. 99, 3003 (1993). [16] G. Viramontes-Gamboa, JL Arauz-Lara, and M. MedinaNoyola, Phys. Rev. Lett. ...
Colloidal Interactions in Partially Quenched Suspensions of Charged Particles
Physical Review Letters, 1998
We report measurements of the effective pair potential between charged colloidal particles in a b... more We report measurements of the effective pair potential between charged colloidal particles in a bidimensional matrix of fixed obstacles. A binary mixture of polystyrene spheres in water is confined between two glass plates. The larger particles are trapped by the plates in a disordered configuration with respect to which the smaller species of particles equilibrates. The structures of both the mobile and the fixed species are measured by videomicroscopy. The pair potential, obtained by deconvoluting the structural information via the Ornstein-Zernike equation, exhibits two attractive components.
Host Range and Genetic Relatedness of Colletotrichum acutatum Isolates from Fruit Crops and Leatherleaf Fern in Florida
Phytopathology, 2009
Isolates of Colletotrichum acutatum were collected from anthracnose-affected strawberry, leatherl... more Isolates of Colletotrichum acutatum were collected from anthracnose-affected strawberry, leatherleaf fern, and Key lime; ripe-rot-affected blueberry; and postbloom fruit drop (PFD)-affected sweet orange in Florida. Additional isolates from ripe-rot-affected blueberry were collected from Georgia and North Carolina and from anthracnose-affected leatherleaf fern in Costa Rica. Pathogenicity tests on blueberry and strawberry fruit; foliage of Key lime, leatherleaf fern, and strawberry; and citrus flowers showed that isolates were highly pathogenic to their host of origin. Isolates were not pathogenic on foliage of heterologous hosts; however, several nonhomologous isolates were mildly or moderately pathogenic to citrus flowers and blueberry isolates were pathogenic to strawberry fruit. Based on sequence data from the internal transcribed spacer (ITS)1-5.8S rRNA-ITS2 region of the rDNA repeat, the glutaraldehyde-3-phosphate dehydrogenase intron 2 (G3PD), and the glutamine synthase intron 2 (GS), isolates from the same host were identical or very similar to each other and distinct from those isolated from other hosts. Isolates from leatherleaf fern in Florida were the only exception. Among these isolates, there were two distinct G3PD and GS sequences that occurred in three of four possible combinations. Only one of these combinations occurred in Costa Rica. Although maximum parsimony trees constructed from genomic regions individually displayed little or no homoplasy, there was a lack of concordance among genealogies that was consistent with a history of recombination. This lack of concordance was particularly evident within a clade containing PFD, Key lime, and leatherleaf fern isolates. Overall, the data indicated that it is unlikely that a pathogenic strain from one of the hosts examined would move to another of these hosts and produce an epidemic.
Effect of Interrupted Wetness Periods on Spore Germination and Apple Infection by Botryosphaeria obtusa
Phytopathology, 1990
The effect of pre and postharvest of cosecha y poscosecha de calcio en papaya va-calcium applicat... more The effect of pre and postharvest of cosecha y poscosecha de calcio en papaya va-calcium applications on antracnoses riedad "criolla" sabre la severidad de antracno-(Colletotrichum gloeosporioides) severity, and sis (CoUetotrichum gloeosporioides) y varia-quality of papaya (Carica papaya) fruit. The effect hIes de calidad del fruto. Los tratamientos pre-of pre and postharvest of calcium applications on cosecha fueron 4: aspersi6n de CaCl2 al 1% Y antracnoses (CoUetotrichum gloeosporioides) 4% (2 aplicaciones: <40 dfas posantesis (dpa) y severity, and quality of papaya (Carica papaya) fruit entre 100-140 dpa) con el penetrante alquilaril-was evaluated in 2 separate experiments. Four polimero (NP-7 Bayer) (0.4 mIlL), CaCO3 al preharvest treatments: spraying of CaC12 at 1% or suelo (1 ton/ha, 70 dpa) y testigo (0% Ca). El 4% in 2 applications: 40 days after anthesis (dpa) diseno experimental fue un BCA (4 repeticio-and .between 100-140 dpa; soil application of nes de 20 frutos). Los tratamientos poscosecha CaCO3 (1 ton/ha, 70 dpa) and control (0% Ca) in a fueron 3: inmersiones par 5 min con 0%, 1 % Y ramdomized blocks design (4 repetitions of 20 4% de CaCI2, con el mismo penetrante. El dise-fruits); and three postharvest treatments: immersions no experimental fue un BCA (3 repeticiones de for 5 min in water with 0% calcium, 1 % and 4% of 15 frutas). Se evalu6 severidad, % calcio en CaCI2, all with a penetrating agent, in a completely cascara, brix, pH, % acidez, firmeza (cascara y ramdomized design (3 repetitions of 15 fruits) were pulpa) y % de madurez. En la aplicaci6n de cal-used. Severity, % calcium content of peel, brix, pH, cia precosecha la severidad fue: 1 % CaC12 con % titratable acidity, fmnness (peel and pulp) and % 6%, testigo 7%, CaCO3 9% y 4% CaC12 con of ripeness were evaluated for both experiments. For 11 %, no se encontr6 que el Ca tuviera un efec-the preharvest calcium application the severity was:
Journal of Stroke & Cerebrovascular Diseases, 2009
Background: Information on risk factors and outcome of persons with aneurysmal subarachnoid hemor... more Background: Information on risk factors and outcome of persons with aneurysmal subarachnoid hemorrhage (SAH) in Mexico is unknown. We sought to describe the clinical characteristics, risk factors, and outcome at discharge of Mexican patients with aneurysmal SAH. Methods: A first-step surveillance system was conducted on consecutive cases confirmed by 4-vessel angiography from November 2002 to October 2004 in 25 tertiary referral centers. Age-and sex-matched control subjects were randomly selected by a 1:1 factor, for multivariate analysis on risk factors. Results: We studied 231 patients (66% women; mean age 52 years, range 16-90 years). In 92%, the aneurysms were in the anterior circulation, and 15% had more than two aneurysms. After multivariate analysis, hypertension (odds ratio 2.46, 95% confidence interval 1.59-3.81) and diabetes mellitus (odds ratio 0.34, 95% confidence interval 0.17-0.68) were directly and inversely associated with aneurysmal SAH, respectively. Median hospital stay was 23 days (range 2-98 days). Invasive treatment was performed in 159 (69%) patients: aneurysm clipping in 126 (79%), endovascular coiling in 29 (18%), and aneurysm wrapping in 4 (2%). The in-hospital mortality was 20% (mostly due to neurologic causes), and 25% of patients were discharged with a modified Rankin score of 4 or 5. Conclusions: Hypertension is the main risk factor for aneurysmal SAH in hospitalized patients from Mexico. The female:male ratio is 2:1. A relatively low in-hospital mortality and a high frequency of invasive interventions are observed. However, a high proportion of patients are discharged with important neurologic impairment. Key Words: Cerebral aneurysmepidemiology-outcome-risk factors-subarachnoid hemorrhage.
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Papers by LUIS F R A N C I S C O HERNÁNDEZ A.