Selección de aislados de Trichoderma spp. para el control biológico de Sclerotium rolfsii Sacc.

bitstream/CENARGEN/29397/1/bp170.pd

Cepas de Trichoderma spp. para el control biológico de Sclerotium rolfsii sacc.

Made available in DSpace on 2018-06-07T01:02:07Z (GMT). No. of bitstreams: 1 20911614400128.pdf: 285548 bytes, checksum: 2236b581111bd0708048f7c44934f9b3 (MD5) Previous issue date: 2008-02-14bitstream/item/178234/1/209116144001-2-8.pd

Analytic models and forward scattering from accelerator to cosmic-ray energies

Analytic models for hadron-hadron scattering are characterized by analytical parametrizations for the forward amplitudes and the use of dispersion relation techniques to study the total cross section $\sigma_{tot}$ and the $\rho$ parameter. In this paper we investigate four aspects related to the application of the model to $pp$ and $\bar{p}p$ scattering, from accelerator to cosmic-ray energies: 1) the effect of different estimations for $\sigma_{tot}$ from cosmic-ray experiments; 2) the differences between individual and global (simultaneous) fits to $\sigma_{tot}$ and $\rho$; 3) the role of the subtraction constant in the dispersion relations; 4) the effect of distinct asymptotic inputs from different analytic models. This is done by using as a framework the single Pomeron and the maximal Odderon parametrizations for the total cross section. Our main conclusions are the following: 1) Despite the small influence from different cosmic-ray estimations, the results allow us to extract an upper bound for the soft pomeron intercept: $1 + \epsilon = 1.094$; 2) although global fits present good statistical results, in general, this procedure constrains the rise of $\sigma_{tot}$; 3) the subtraction constant as a free parameter affects the fit results at both low and high energies; 4) independently of the cosmic-ray information used and the subtraction constant, global fits with the odderon parametrization predict that, above $\sqrt s \approx 70$ GeV, $\rho_{pp}(s)$ becomes greater than $\rho_{\bar{p}p}(s)$, and this result is in complete agreement with all the data presently available. In particular, we infer $\rho_{pp} = 0.134 \pm 0.005$ at $\sqrt s = 200$ GeV and $0.151 \pm 0.007$ at 500 GeV (BNL RHIC energies).Comment: 16 pages, 7 figures, aps-revtex, wording changes, corrected typos, to appear in Physical Review

Estabelecimento de metodologia para contaminação de solo com propágulos dos fungos Sclerotinia sclerotiorum e Sclerotium rolfsii, e expressão de doença em soja.

bitstream/CENARGEN/27926/1/cot135.pd

Métodos para la identificación del antígeno de histocompatibilidad HLA-B27: comparación de cuatro protocolos técnicos

Introducción: La asociación del HLA-B27 y las Espondiloartritis, ha hecho evidente que la tipificación del HLA-B27 sea considerada como un apoyo en el diagnóstico de estas enfermedades. Los métodos más empleados para la determinación del antígeno HLA-B27 en los laboratorios clínicos y en investigación son: la microlinfocitotoxicidad (MCTX), la citometría de flujo digital (CMFd), la citometría de flujo análoga (CMFa) y la reacción en cadena de la polimerasa con primers de secuencia específicos (PCR-SSP).Objetivo: Comparar MCTX con la CMFd, la CMFa con la CMFd, y la técnica de CMFd frente a PCR-SSP.Métodos para la identificación del antígeno de histocompatibilidad hla-b27 Métodos: Se analizaron 4109 solicitudes de HLA-B27 en población con manifestaciones sugestivas de EAS remitidas entre 2009 y 2012 al Hospital Militar Central y al Instituto de Referencia Andino. Se evaluaron las frecuencias obtenidas por Chi cuadrado (X2); para estimar la concordancia metodológica se utilizó el Coeficiente de Correlación Intraclase (CCI). Los análisis se realizaron con el paquete estadístico SPSS V18.Resultados: Al evaluar 467 datos por la técnica de CMFa frente a PCR-SSP, la CMFa mostró 239 resultados entre positivos y en rango indeterminado, de los cuales, luego de ser confirmados PCRSSP, solo 213 demostraron la expresión de HLA-B27 (p<0.05). Se obtuvieron 208 resultados realizados por CMFd y PCR-SSP simultáneamente, observándose una alta correspondencia entre estas técnicas (p<0.05). Para evaluar la concordancia entre la MCTX y CMFd se analizaron 34 datos,revelando un 100% de correspondencia entre esta dos metodologías CCI=1,p<0.05).Conclusión: La citometría de flujo digital es un método rápido que presenta un desempeño altamente confiable para la identificación de HLA-B27, resultados que se recomiendan confirmar por PCR SSP

Echoes of time. The mobility of Brazilian researchers and students in Portugal

A investigação que apresentamos, de caráter exploratório, recaiu sobre histórias biográficas de brasileiros que escolhem Portugal para prosseguir formação e ou investigação. Procura-se encontrar na sua experiência elos de ligação explicativos sobre as motivações e os processos que os trazem para Portugal, assim como as expetativas e os projetos que comportam para os seus futuros e que incluem, ou não, este país. Temos em conta, especialmente, a forma como essa narrativa transporta sentidos identitários decorrentes das formas de relacionamento intercultural e político entre Portugal e Brasil e formas de cooperação implícitas, assim como mapas representacionais acerca dos lugares de eleição para desenvolvimento de carreiras científicas e académicas. A nossa pesquisa incide sobre as informações recolhidas através de um inquérito por questionário e entrevistas realizadas junto de estudantes e bolseiros brasileiros em Portugal.We present an exploratory study that investigated biographical stories of Brazilians who choose to continue their education or develop research in Portugal. We sought to find in their experiences explanatory links connecting the motivations and processes that bring them to Portugal, as well as the expectations and projects that they hold for the future, which may include, or not, this country. We take into account, particularly, the way this narrative carries senses of identity arising from the forms of intercultural and political relationship between Portugal and Brazil, as well as implicit forms of cooperation and representations about the places chosen for the development of scientific and academic careers. Our research draws on information collected through a survey based on questionnaires and interviews with Brazilian students and scholarship holders in Portugal.(undefined

A review of exposure assessment methods for epidemiological studies of health effects related to industrially contaminated sites

BACKGROUND: this paper is based upon work from COST Action ICSHNet. Health risks related to living close to industrially contaminated sites (ICSs) are a public concern. Toxicology-based risk assessment of single contaminants is the main approach to assess health risks, but epidemiological studies which investigate the relationships between exposure and health directly in the affected population have contributed important evidence. Limitations in exposure assessment have substantially contributed to uncertainty about associations found in epidemiological studies. OBJECTIVES: to examine exposure assessment methods that have been used in epidemiological studies on ICSs and to provide recommendations for improved exposure assessment in epidemiological studies by comparing exposure assessment methods in epidemiological studies and risk assessments. METHODS: after defining the multi-media framework of exposure related to ICSs, we discussed selected multi-media models applied in Europe. We provided an overview of exposure assessment in 54 epidemiological studies from a systematic review of hazardous waste sites; a systematic review of 41 epidemiological studies on incinerators and 52 additional studies on ICSs and health identified for this review. RESULTS: we identified 10 multi-media models used in Europe primarily for risk assessment. Recent models incorporated estimation of internal biomarker levels. Predictions of the models differ particularly for the routes ‘indoor air inhalation’ and ‘vegetable consumption’. Virtually all of the 54 hazardous waste studies used proximity indicators of exposure, based on municipality or zip code of residence (28 studies) or distance to a contaminated site (25 studies). One study used human biomonitoring. In virtually all epidemiological studies, actual land use was ignored. In the 52 additional studies on contaminated sites, proximity indicators were applied in 39 studies, air pollution dispersion modelling in 6 studies, and human biomonitoring in 9 studies. Exposure assessment in epidemiological studies on incinerators included indicators (presence of source in municipality and distance to the incinerator) and air dispersion modelling. Environmental multi-media modelling methods were not applied in any of the three groups of studies. CONCLUSIONS: recommendations for refined exposure assessment in epidemiological studies included the use of more sophisticated exposure metrics instead of simple proximity indicators where feasible, as distance from a source results in misclassification of exposure as it ignores key determinants of environmental fate and transport, source characteristics, land use, and human consumption behaviour. More validation studies using personal exposure or human biomonitoring are needed to assess misclassification of exposure. Exposure assessment should take more advantage of the detailed multi-media exposure assessment procedures developed for risk assessment. The use of indicators can be substantially improved by linking definition of zones of exposure to existing knowledge of extent of dispersion. Studies should incorporate more often land use and individual behaviour

The ASAS-SN Bright Supernova Catalog I: 2013-2014

We present basic statistics for all supernovae discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN) during its first year-and-a-half of operations, spanning 2013 and 2014. We also present the same information for all other bright ($m_V\leq17$), spectroscopically confirmed supernovae discovered from 2014 May 1 through the end of 2014, providing a comparison to the ASAS-SN sample starting from the point where ASAS-SN became operational in both hemispheres. In addition, we present collected redshifts and near-UV through IR magnitudes, where available, for all host galaxies of the bright supernovae in both samples. This work represents a comprehensive catalog of bright supernovae and their hosts from multiple professional and amateur sources, allowing for population studies that were not previously possible because the all-sky emphasis of ASAS-SN redresses most previously existing biases. In particular, ASAS-SN systematically finds supernovae closer to the centers of host galaxies than either other professional surveys or amateurs, a remarkable result given ASAS-SN's poorer angular resolution. This is the first of a series of yearly papers on bright supernovae and their hosts that will be released by the ASAS-SN team