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Fotocópia
Id: lil-576397
Autor: López, Dania; Athanasiadou, María; Athanassiadis, Ioannis; Yáñez, Leticia; Ramírez, Rocío; Díaz Barriga, Fernando; Bergman, Åke.
Título: Estudio preliminar sobre los niveles de exposición a PBDES en sangre y leche materna en México / Exposure levels of PBDES in blood and breast milk in Mexico, a preliminary study
Fonte: Acta toxicol. argent;14(supl):52-54, ago. 2006. tab, graf.
Idioma: es.
Conferência: Apresentado em: Workshop on Advances in the Use of Biomarkers in Children, Buenos Aires, 17-18 nov. 2005.
Resumo: Los retardantes de flama bromados han sido muy usados en las últimas décadas en muchos productos de consumo. Su producción, uso, lipofilicidad y persistencia, los han vuelto contaminantes ambientales ubicuos. Han sido detectados en el ser humano en varios países y poco se conoce sobre susefectos tóxicos. El propósito de este estudio fue determinar de manera preliminar los niveles de exposición a difeniléteres polibromados (PBDEs) en la población mexicana. Se tomaron muestras de sangre a 5 mujeres de una zona urbana y muestras de leche materna a 7 de una zona rural. Los niveles de PBDEs en las mujeres de la zona urbana fueron de 21.5-37.5 ng/glípido y los de las mujeres rurales fueron 0.8-5.4 ng/g lípido.

The brominated flame retardants have been used in the last decades inmany products. Their production, use, lipofilicity and persistence, make them ubiquituos in the environment. They have been detected in humans in several countries and little is known about their toxics effects. The aim of this pilot study was to determine exposure levels of polybrominated diphenylethers (PBDEs) in the Mexican population, blood samples were taken from five women living in an urban area, whereas breast milk samples were collected from seven rural women. The levels of PBDEs in theurban area were 21.5-37.5 ng/g lipid; whereas milk concentrations in rural women were 0.8-5.4 ng/glipid.
Descritores: Hidrocarbonetos Bromados/toxicidade
Leite Humano/química
Retardadores de Chama/toxicidade
Sangue
-México/epidemiologia
Saúde Pública
Medição de Risco
Limites: Seres Humanos
Feminino
Responsável: AR1.1 - Biblioteca Rafael Herrera Vegas


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Texto completo SciELO Chile
Texto completo
Id: lil-448791
Autor: Montealegre, Jaime R; Herrera, Rodrigo; Velásquez, Juan Carlos; Silva, Polyana; Besoaín, Ximena; Pérez, Luz María.
Título: Biocontrol of root and crown rot in tomatoes under greenhouse conditions using Trichoderma harzianum and Paenibacillus lentimorbus: additional effect of solarization
Fonte: Electron. j. biotechnol;8(3), Dec. 2005. tab, ilus.
Idioma: en.
Projeto: Fondecyt.
Resumo: Trichoderma harzianum 650 (Th650) and Paenebacillus lentimorbus 629 (Pl629) selected earlier for their ability to control Rhizoctonia solani, Fusarium solani and F. oxysporum in vitro, were applied alone or combined with solarization (summer assay) and/or with methyl bromide (MeBr) (summer and winter assays) to a soil with a high inoculum level, for the control of tomato root rot caused by the complex F. oxysporum f. sp. lycopersici - Pyrenochaeta lycopersici - Rhizoctonia solani. Evaluations were also performed independently for root damage caused by P. lycopersici, and also for R. solani in the summer assay. MeBr decreased tomato root damage caused by the complex from 88.7 percent to 21.2 percent and from 78.4 percent to 35.7 percent in the summer and in the winter assay, respectively. None of the bio-controllers could replace MeBr in the winter assay, but Th650 and Pl629 reduced root damage caused by this complex in the summer assay. Treatments with bio-controllers were improved by their combination with solarization in this season. Independent evaluations showed that the positive control of Th650 towards R. solani and the lack of effect on P. lycopersici correlates well with the endochitinase pattern expressed by Th650 in response to these phytopathogens. Root damage caused by R. solani can be controlled at a similar level as it does MeBr in summer assays, thus representing an alternative to the use of this chemical fungicide for the control of this phytopathogen.
Descritores: Antifúngicos/metabolismo
Controle Biológico de Vetores/métodos
Fusarium/metabolismo
Lycopersicon esculentum/microbiologia
Rhizoctonia/metabolismo
-Bacillus/metabolismo
Estufas para Plantas
Hidrocarbonetos Bromados
Fungos Mitospóricos/metabolismo
Modelos Biológicos
Raízes de Plantas/microbiologia
Estações do Ano
Microbiologia do Solo
Luz Solar
Trichoderma/metabolismo
Responsável: CL1.1 - Biblioteca Central



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