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Search Results: 1 - 10 of 297840 matches for " J. Haro "
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The semiclassical theory of quantized fields in classical electromagnetic backgrounds
J. Haro
Revista mexicana de física , 2004,
Abstract: Damos la formulación matemática del proceso de creación de pares de partículas sin spin en campos electromagnéticos. Calculamos la probabilidad de que se creen n pares en la aproximación semiclásica, y probamos, en esta aproximación, que la creación de pares es un proceso estocástico de Poisson. Finalmente, damos una demostración rigurosa y una interpretación correcta de la fórmula de Schwinger.
Estudio del número de pares creados por un campo eléctrico
J. Haro
Revista mexicana de física , 2004,
Abstract: En este trabajo estudiamos el numero de pares creados en un campo electrico usando la aproximacion semiclasica. Veremos que en la aproximacion semiclasica el proceso estocastico N(t)=′′numero de pares creados en el instante t′′, es un proceso estocastico de Poisson con esperanza (aE(t))/(64mc2), donde a′ es la constante de estructura fina y E(t) es la energ a del campo electrico en el instante t′.
Algunas experiencias de innovación educativa
de Haro, J. José
Arbor : Ciencia, Pensamiento y Cultura , 2009, DOI: 10.3989/arbor.2009.extran1207
Abstract: In this article we show some experiences in educational innovation area performed by teachers with students of ESO and Bachelor at Amor de Dios school in Barcelona (www.amordedios. org). We also discuss the characteristics of blogs, wikis and social networks, as well as their potential usage, all based on the experience carried out with the students. We also present some useful guidelines about selection of the various systems depending on teachers’ needs. Se presentan algunas de las experiencias llevadas a cabo en el ámbito de la innovación educativa con alumnos de ESO y Bachillerato en el centro concertado de educación primaria y secundaria Amor de Dios de Barcelona (www.amordedios.org). Se discuten las características de blogs, wikis y redes sociales, así como sus posibilidades de uso, todo ello en base a las experiencias realizadas con los alumnos. Igualmente se presentan algunas directrices que pueden ayudar para la selección de unos sistemas u otros según las necesidades educativas del profesor.
Sudden singularities in semiclassical gravity
J. de Haro,J. Amoros,E. Elizalde
Physics , 2012, DOI: 10.1103/PhysRevD.85.123527
Abstract: It has been claimed in a recent paper \cite{bbfhd12} that sudden singularities will survive in semiclassical gravity. This issue is here carefully reviewed, pointing out that such conclusion, even if valid under some specific conditions, does not stand in other cases. An explicit example is studied in detail to support our statement, stemming from these other situations, that quantum effects may in fact drastically modify the behavior of sudden singularities.
Gest o estratégica do saneamento
Ary Haro dos Anjos Júnior
Engenharia Sanitaria e Ambiental , 2011, DOI: 10.1590/s1413-41522011000300002
Abstract:
Dysregulation of IRP1-Mediated Iron Metabolism Causes Gamma Ray-specific Radioresistance in Leukemia Cells
Kurtis J. Haro, Aneesh Sheth, David A. Scheinberg
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0048841
Abstract: Iron is required for nearly all organisms, playing important roles in oxygen transport and many enzymatic reactions. Excess iron, however, can be cytotoxic. Emerging evidence suggests that radioresistance can be achieved in lower organisms by the protection of proteins, but not DNA, immediately following ionizing radiation (IR) exposure, allowing for improved DNA repair. One potential mechanism for protein protection is controlling and limiting the amount of free iron in cells, as has been demonstrated in the extremophile Deinococcus Radiodurans, reducing the potential for oxidative damage to proteins during exposure to IR. We found that iron regulatory protein 1 (IRP1) expression was markedly reduced in human myeloid leukemia HL60 cells resistant to low linear energy transfer (LET) gamma rays, but not to high LET alpha particles. Stable knockdown of IRP1 by short-hairpin RNA (shRNA) interference in radiosensitive parental cells led to radioresistance to low LET IR, reduced intracellular Fenton chemistry, reduced protein oxidation, and more rapid DNA double-strand break (DSB) repair. The mechanism of radioresistance appeared to be related to attenuated free radical-mediated cell death. Control of intracellular iron by IRPs may be a novel radioresistance mechanism in mammalian cells.
Dominance shift of zooplankton species composition in the central Strait of Georgia, British Columbia during 1997
Haro-Garay, Martha J.;Huato Soberanis, Leonardo;
Hidrobiológica , 2008,
Abstract: a multivariate analysis of the zooplankton was completed during the 1997 annual cycle in the central strait of georgia, canada. sampling was conducted monthly in a single location (49° 15' 0" n, 123° 44' 9" w). the study used the species as environment descriptors, and examined possible patterns of species associations. principal components analysis showed two groups of species coinciding with changes in vertical salinity structure arising from two phases of the fraser river runoff. group i was dominant during fall-winter to early spring related to low-runoff season. group ii was dominant during late spring to summer, and related to high-runoff season. notable results were the scarcity of neocalanus plumchrus and euphausia pacifica, typically dominant species of zooplankton, coincident with river runoff levels lower than previous years and with an early phytoplankton bloom. we speculate that these results are a consequence of el ni?o 1997 event, combined with the climate change expressed as a decreased freshwater runoff. low abundance of neocalanus plumchrus and euphausia pacifica affected the zooplankton biomass. consequently, substitute dominant p. pacifica and cyphocaris challengeriprobable play an important role in trophic dynamics while n. plumchrus and e. pacifica are scarce. both amphipods feed on small zooplankters that feed on nanoplankton, concentrating food energy and biomass from small zooplankters. this suggests that p. pacifica and c. challengeri are an important link in the trophic ecology of the strait of georgia. in conclusion, shifts in zooplankton species dominance highly likely have an effect on juvenile zooplanktivorous salmon specie.
Dominance shift of zooplankton species composition in the central Strait of Georgia, British Columbia during 1997 Cambio en el zooplancton dominante del estrecho de Georgia, British Columbia durante 1997
Martha J. Haro-Garay,Leonardo Huato Soberanis
Hidrobiológica , 2008,
Abstract: A multivariate analysis of the zooplankton was completed during the 1997 annual cycle in the central Strait of Georgia, Canada. Sampling was conducted monthly in a single location (49° 15' 0" N, 123° 44' 9" W). The study used the species as environment descriptors, and examined possible patterns of species associations. Principal components analysis showed two groups of species coinciding with changes in vertical salinity structure arising from two phases of the Fraser River runoff. Group I was dominant during fall-winter to early spring related to low-runoff season. Group II was dominant during late spring to summer, and related to high-runoff season. Notable results were the scarcity of Neocalanus plumchrus and Euphausia pacifica, typically dominant species of zooplankton, coincident with river runoff levels lower than previous years and with an early phytoplankton bloom. We speculate that these results are a consequence of El Ni o 1997 event, combined with the climate change expressed as a decreased freshwater runoff. Low abundance of Neocalanus plumchrus and Euphausia pacifica affected the zooplankton biomass. Consequently, substitute dominant P. pacifica and Cyphocaris challengeriprobable play an important role in trophic dynamics while N. plumchrus and E. pacifica are scarce. Both amphipods feed on small zooplankters that feed on nanoplankton, concentrating food energy and biomass from small zooplankters. This suggests that P. pacifica and C. challengeri are an important link in the trophic ecology of the Strait of Georgia. In conclusion, shifts in zooplankton species dominance highly likely have an effect on juvenile zooplanktivorous salmon specie. Se realizó un análisis multivariado del zooplancton de la parte central del estrecho de Georgia, Canadá durante 1997, con muestreos mensuales en una localidad (49° 15' 0" N, 123° 44' 9" W). Las especies se usaron como descriptores del ambiente para examinar posibles patrones de asociación. Mediante análisis de componentes principales se encontraron dos grupos coincidentes con cambios en la estructura vertical de la salinidad inducidos por las fases de flujo intensa y débil del Río Fraser. El grupo I estuvo presente de septiembre a marzo durante la fase de flujo débil del río. El grupo II durante la fase de flujo intensa de mayo a julio. Fue notoria la escasez de Neocalanus plumchrus y Euphausia pacifica, especies dominantes típicas, coincidente con niveles de flujo del Río Fraser inferiores a a os previos, y con un florecimiento de fitoplancton temprano. Se especula que estos resultados son consecuenci
Schizophrenia Outpatient Health Outcomes study: twelve-month findings
Novick D,Ascher-Svanum H,Haro JM,Bertsch J
Pragmatic and Observational Research , 2012,
Abstract: Diego Novick,1 Haya Ascher-Svanum,2 Josep Maria Haro,3 Jordan Bertsch,3 Michihiro Takahashi41Eli Lilly and Company, Windlesham, Surrey, UK; 2Eli Lilly and Company, Indianapolis, IN; 3Parc Sanitari Sant Joan de Déu, CIBERSAM, Universitat de Barcelona, Barcelona, Spain; 4Eli Lilly and Company, Kobe, JapanBackground: The purpose of this study was to assess the 12-month outcomes associated with naturalistic antipsychotic treatment of patients participating in the Schizophrenia Outpatient Health Outcomes (SOHO) study.Methods: SOHO is a 3-year, prospective, observational study of the health outcomes associated with antipsychotic treatment in 10 European countries. The study included over 10,000 outpatients who were initiating or changing their antipsychotic medication. Medication use pattern, change in symptom severity, social functioning, and health-related quality of life were assessed, as well as rates of response, remission, treatment discontinuation, adverse events, and hospitalization.Results: Clinical Global Impression-Severity for Schizophrenia (CGI-SCH) and quality of life scores improved in all treatment cohorts. There were greater improvements in the CGI-SCH overall symptom score and in the CGI-SCH positive, negative, cognitive, and depressive symptom scores in the olanzapine and clozapine cohorts compared with other treatment cohorts. Changes were associated with an improvement in quality of life. Patients treated with olanzapine, quetiapine, and clozapine had better tolerability per extrapyramidal symptoms and sexual-related dysfunction measures compared with patients receiving risperidone, amisulpride, or typicals. Patients treated with olanzapine had greater weight gain than patients in all other treatment cohorts.Conclusion: Patients initiated on olanzapine and clozapine tend to have better outcomes at 12 months than patients initiated on other antipsychotics in routine outpatient clinical practice. Results should be interpreted conservatively due to the nonrandomized study design.Keywords: schizophrenia, treatment, outcomes, outpatient, remission, antipsychotics
Síndrome de PRES en la sepsis Posterior reversible encephalopathy syndrome (pres) in sepsis
C. de Haro,R. Ferrer,A. Tercero,J. Vallés
Medicina Intensiva , 2012,
Abstract:
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