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1.
Rev. Assoc. Med. Bras. (1992) ; 63(2): 164-172, Feb. 2017. tab, graf
Article in English | LILACS | ID: biblio-842529

ABSTRACT

Summary Objective: The aim was to evaluate the effectiveness of the experimental synergists muscle ablation model to promote muscle hypertrophy, determine the period of greatest hypertrophy and its influence on muscle fiber types and determine differences in bilateral and unilateral removal to reduce the number of animals used in this model. Method: Following the application of the eligibility criteria for the mechanical overload of the plantar muscle in rats, nineteen papers were included in the review. Results: The results reveal a greatest hypertrophy occurring between days 12 and 15, and based on the findings, synergist muscle ablation is an efficient model for achieving rapid hypertrophy and the contralateral limb can be used as there was no difference between unilateral and bilateral surgery, which reduces the number of animals used in this model. Conclusion: This model differs from other overload models (exercise and training) regarding the characteristics involved in the hypertrophy process (acute) and result in a chronic muscle adaptation with selective regulation and modification of fast-twitch fibers in skeletal muscle. This is an efficient and rapid model for compensatory hypertrophy.


Resumo Objetivo: Avaliar a eficácia do modelo experimental de ablação dos sinergistas para promover a hipertrofia muscular, determinar o período de maior hipertrofia, sua influência sobre os tipos de fibras musculares e determinar diferenças na remoção unilateral ou bilateral para reduzir o número de animais utilizados nesse modelo. Método: Após a aplicação dos critérios de elegibilidade para sobrecarga mecânica do músculo plantar em ratos, 19 artigos foram incluídos na revisão. Resultados: Ocorre maior hipertrofia entre os dias 12 e 15, o que torna o modelo eficiente para alcançar a hipertrofia rapidamente. O membro contralateral também pode ser usado, pois não houve diferença entre a cirurgia unilateral e bilateral, o que reduz o número de animais usados no experimento. Conclusão: O modelo difere de outros modelos de sobrecarga (exercício e treinamento) em razão das características envolvidas no processo de sobrecarga imposta (aguda), resultando em uma adaptação crônica muscular com modificação de fibras de contração rápida do músculo esquelético. É um modelo rápido e eficiente para se estudar hipertrofia compensatória.


Subject(s)
Animals , Rats , Muscle, Skeletal/surgery , Muscle, Skeletal/physiology , Ablation Techniques , Tendons , Muscle, Skeletal/innervation , Models, Animal , Hypertrophy , Muscle Contraction , Muscle Denervation
2.
Rev. cuba. med. trop ; 68(2): 125-135, may.-ago. 2016. ilus, tab
Article in Spanish | LILACS, CUMED | ID: biblio-844985

ABSTRACT

Introducción: el programa de control de Aedes aegypti (Linnaeus) (Diptera: Culicidae) en Cuba utiliza temefos como larvicida y piretroides como adulticidas, aunque el organofosforado clorpirifos ha sido utilizado esporádicamente. Conocer el nivel de resistencia a estos insecticidas es esencial para lograr un control efectivo de esta especie. Objetivo: determinar el nivel de resistencia a insecticidas en su grado técnico y en sus formulaciones comerciales en Ae. aegypti de Pinar del Río. Métodos: una cepa de Ae. aegypti del Área de Salud Raúl Sánchez, Pinar del Río, fue evaluada a través de los bioensayos de la Organización Mundial de la Salud para determinar la susceptibilidad en larvas al organofosforado temefos en su formulación técnica. Se evaluaron además tres formulaciones granuladas de temefos (Abatex-G1, Biolarv G-1 y Temefar G-1). En el estado adulto se determinó el nivel de susceptibilidad a los insecticidas piretroides: cipermetrina, deltametrina, lambdacialotrina y al organofosforado clorpirifos, en su formulación técnica. Además se evaluaron algunos en su formulación comercial: Galgotrin 25 EC (cipermetrina), Aqua K-Otrina 2 EW (deltametrina) y Clorcide 44 EC (clorpirifos). Resultados: en larvas, se encontró alta resistencia a temefos, en su formulación técnica, y con los productos en su formulación comercial, se observó una efectividad del 100 por ciento, con recambio diario de agua, de hasta 20 días para Temefar G1, 18 días para Biolarv G1 y 12 días para Abatex G1. En los ensayos de adultos, la cepa resultó susceptible a cipermetrina, deltametrina y clorpirifos, y resistente a lambdacialotrina. Con respecto a las tres formulaciones comerciales evaluadas, solo se observó resistencia a Aqua K-Otrina 2 EW. Conclusiones: el uso de estrategias de control integrado de Ae. aegypti se hace necesario para disminuir la frecuencia de uso de temefos, y así recuperar la efectividad de este insecticida. Además, se evitaría la aparición de resistencia a productos adulticidas que aun mantienen su efectividad para el control efectivo de esta especie en la zona de estudio(AU)


Introduction: the control program of Aedes aegypti (Linnaeus) (Diptera: Culicidae) in Cuba uses temephos as larvicide and pyrethroids as adulticide although the organophosphorate chlorpyrifos has been barely used. The level of knowledge about resistance to insecticides is essential to effectively control this species. Objective: to determine the level of resistance to insecticides of Ae. aegypti from Pinar del Rio in its technical aspect and in commercial formulations. Methods: one Ae. aegypti strain from the health area Raul Sánchez in Pinar del Rio province was evaluated through the World Health Organization bioassays to determine susceptibility of larvae to temephos in its technical formulation. Additionally, three granulated formulations of temephos were evaluated (Abatex-G1, Biolarv G-1 and Temefar G-1). In the adult state, the level of susceptibility to pyrethroids called cypermethrin, deltamethrin, lambda cyhalothrine and to organophosphate chlorpyrifos in its technical formulation. Some of them were evaluated in its commercial formulation (Galgotrin 25 EC (cypermethrin), Aqua K-Otrina 2 EW (deltamethrin) and Clorcide 44 EC (chlorpyrifos). Results: it was found in larvae that the resistance to temephos was high in the technical formulation, but the commercial formulation showed an effectiveness rate of 100 percent., with daily change of water, up to 20 days for Temefar G1, 18 days for Biolarv G1 and 12 for Abatex G1. In the assays with adult vectors, the strain turned to be susceptible to cypermethrin, deltamethrin and chlorpyrifos and resistant to lambda cyhalothrin. Regarding the three evaluated commercial formulations, resistance to Aqua K-Otrina 2 EW was proved. Conclusions: the use of integrated control strategies for Ae. aegypti makes it necessary to reduce the frequency of use of temephos and to recover the effectiveness of this insecticide. Moreover, it will avoid the occurrence of resistance to adulticide products that are still effective for the control of this species in the study area(AU)


Subject(s)
Insecticide Resistance/physiology , Pest Control, Biological/methods , Aedes , Cuba , Insecticides, Organophosphate/methods
3.
Rev. méd. panacea ; 5(2): 52-56, mayo-ago. 2015. tab, graf
Article in Spanish | LILACS | ID: biblio-1023013

ABSTRACT

Objetivo: Determinar la prevalencia y asociación entre exposición a plaguicidas antes y durante el primer trimestre de la gestación y el riesgo de malformación congénita. Material y métodos: Estudio observacional, transversal retrospectivo, analítico de casos y controles. Los casos (n = 57) se seleccionaron por muestreo no probabilístico y los controles (n= 114) por muestreo aleatorio simple de una población hospitalaria de la Región Ica, durante el periodo de 3 años comprendido entre el 1 de enero del 2005 al 31 de diciembre del 2007. Los casos, se definieron como neonatos con malformaciones congénitas y los controles, recién nacidos sin malformaciones. Se consideró exposición a cualquier contacto con plaguicidas. Se evaluaron otros factores de riesgo conocidos para malformación congénita: in gesta de medicamentos, drogadicción, alcoholismo y anemia materna severa, como factores de confusión. Resultados: Se reportaron 26 malformaciones de la cara, boca y paladar, 11 del sistema cardiovascular, 11 de las extremidades, 7 del sistema genitourinario, 6 del sistema nervioso central y 12 otras malformaciones. Las gestantes expuestas tuvieron un alto riesgo de procrear hijos malformados OR 2,85 (IC 95% 1,46 ­ 5,54 p < 0,05). Los riesgos más elevados a malformaciones fueron: exposición por acudir a campos fumigados OR: 3,82 (IC 95% 1,92 ­ 7,60 p< 0,05) y vivir cerca de campos fumigados OR: 3,07 (IC 95% 1,59 ­ 5,92 p < 0.05) . Conclusiones: Se muestra evidencia epidemiológica de la relación causal entre exposición a plaguicidas y malformaciones congénitas en una muestra de mujeres gestantes en el hospital regional de Ica. (AU)


Objective: To determine the prevalence and association between pesticide exposure before and during the first trimester of pregnancy and the risk of congenital malformation in the systems: cardiovascular, genitourinary, central nervous malformations of the face, mouth, palate and limbs. . Materials and Methods: Observational, transversal retrospective analytical case-control study. The cases (n = 57) were selected by non-probability sampling and controls (n = 114) by simple random sampling from a hospital population of Ica region during the three years period from 1 January 2005 to 31 December 2007. The cases were defined as infants with congenital malformations and controls infants without malformations. Exposures to any contact with pesticides are considered. In quest of drugs, drug addiction, alcoholism and severe maternal anemia, as confounding factors: other known risk factors for congenital malformation they were evaluated. Results: 26 were reported defects of the face, mouth and palate, cardiovascular system 11, 11 of the limbs 7 of the genitourinary system, central nervous system 6 and 12 other malformations. Exposed pregnant women had a higher risk of bearing children malformed OR 2,85 (95% CI 1,46 to 5,54 p < 0,05). The highest risk of malformations were fumigated exposure attend camps OR : 3,82 ( 95% CI 1,92 to 7,60 p < 0,05 ), living near sprayed fields OR : 3,07 ( IC 95 % 1,59 to 5,92 p < 0,05) and living with a spouse working in fields sprayed OR: 2,40 (95% CI 1,21 to 4,78 p<0,05). Conclusions: Epidemiological evidence of a causal relationship between pesticide exposure and birth defects. (AU)


Subject(s)
Humans , Female , Pesticide Synergists , Risk Management , Congenital Abnormalities , Maternal-Fetal Exchange , Case-Control Studies , Cross-Sectional Studies , Retrospective Studies , Observational Studies as Topic
4.
Bol. malariol. salud ambient ; 51(2): 199-206, dez. 2011. ilus
Article in Spanish | LILACS | ID: lil-630467

ABSTRACT

Se evaluó la respuesta a los insecticidas organofosforados malatión y pirimifos-metil en poblaciones de campo de adultos Culex spp. del Municipio Mario Briceño Iragorry del Estado Aragua. Se realizaron los bioensayos en botellas tratadas con insecticidas. La determinación del tiempo-mortalidad, permitió obtener la línea base de susceptibilidad de los insecticidas evaluados. Se definió la dosis diagnóstica como la menor dosis que mata el mayor porcentaje de los insectos expuestos. El número de sobrevivientes a los 60 minutos de exposición a dichas dosis fue considerado como criterio de resistencia definiéndose dicho tiempo, como el umbral de resistencia. Los mosquitos resultaron resistentes a malatión a las concentraciones 0,1; 1 y 5 μg/mL con valores de TL100= 90; 90 y 75 minutos respectivamente y susceptibles a pirimifos-metil a las concentraciones 1 y 5 μg/mL con valores TL100= 30 y 15 minutos respectivamente, a la concentración 0,1 μg/mL se obtuvo TL100= 75 lo cual no se estimó por ser una dosis baja. Las concentraciones 5 μg/mL de malatión, 0, μg/ml de pirimifos-metil se sugieren como dosis referenciales. Se identificaron mecanismos de resistencia con el sinergista butóxido de piperonilo (PB) a las concentraciones de malatión 1 y 5 μg/mL con FS = 2 y 2,5 respectivamente. Las enzimas de multifunción oxidasa (MFO) juegan un papel importante en la resistencia al insecticida malation. Los resultados obtenidos, aportan información básica para futuros programas de control de Culex spp., si fuese necesario, debido a su importancia como plaga de ambientes turísticos y como vector de Filariasis (bancroftiasis) y Fiebre del Nilo.


We evaluated the response to the organophosphorus insecticides malathion and pirimiphos-methyl in field populations of adult Culex spp. Mario Briceño Iragorry Municipality Aragua state. Bioassays were carried out using the bottles treated with insecticides. The time-mortality determination allowed us to obtain the baseline susceptibility of the insecticides evaluated. Diagnostic dose was defined as the lowest dose that kills the highest percentage of exposed insects. Survivors after 60 minutes of exposure to these doses was considered as resistance criterion defining this time, as the threshold of resistance. The mosquitoes were resistant to malathion at concentrations 0.1; 1 and 5 μg/mL with values of TL100= 90; 90 and 75 minutes respectively and susceptible to pirimiphos-methyl at concentrations 1 and 5 μg/mL with values of TL100= 30 and 15 minutes respectively, was obtained at the concentration 0.1 μg /mL TL100= 75 which was not considered to be a low dose. The concentrations 5 μg /mL of malathion, 0.1 μg / ml of pirimiphos-methyl are suggested as a reference dose. Resistance mechanisms were identified with the synergist piperonyl butoxide (PB) at concentrations of malathion 1 and 5 μg/mL with FS = 2 and 2.5 respectively. Multifunction oxidase enzymes (MFO) play an important role in resistance to the insecticide malathion. The obtained results provide basic information for future monitoring programs of Culex spp, if necessary, due to its importance as a pest of tourist environments and as a vector of Filariasis (bacroftiosis) and West Nile Fever.


Subject(s)
Animals , Culex , Esterases , Fever , Insecta , Oxidoreductases , Biological Assay , Ceratopogonidae , Culicidae , Diptera , Insecticides
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