ResumenCuatro cepas de Beauveria sp. (ABvPr11, ABvPr8, ABvPr3 y ABvSr4), fueron aisladas y caracterizadas de ejemplares de la langosta Schistocerca piceifrons peruviana procedentes de la Provincia de Huamanga del Departamento de Ayacucho. La capacidad entomocida de las 4 cepas fue evaluada en la langosta Schistocerca piceifrons peruviana. Los resultados muestran que todas las cepas, en soluciones de 10 8 conidias/mL, producen un 100% de mortalidad. El tiempo que se necesitó para eliminar el 100% de las langostas, para las cepas ABvPr11, ABvPr8, ABvSr4 y ABvPr3 fue de 12, 14 y 16 días respectivamente. Al décimo día se observó diferencias significativas respecto a la mortalidad, entre la cepa ABvPr11(90%) y la cepas ABvSr4(74%), ABvPr8(72%) y ABvPr3(64.6%). Posteriormente se determinó el tiempo de letalidad al 50% (TL 50 ) de la población de langostas, con un intervalo de 8,38 a 9,16 días y el tiempo de letalidad al 80% (TL 80 ) fue de 9,6 a 11,5 días. La cepa ABvPr11 presentó la mayor actividad entomocida para el control de Schistocerca piceifrons peruviana L.A.Palabras claves: entomopatogeno, control biológico, langosta, Schistocerca, Beuaveria. AbstractFour strains of Beauveria sp. (ABvPr11, ABvPr8, ABvPr3, ABvSr4), that were found in the locust Schistocerca piceifrons peruviana from Huamanga, Ayacucho, Peru, were isolated and morphologically characterized. Entomicidal activities of four strains were evaluated on the locust. Results showed that all the strains producing 100% mortality when using solutions of 108 conidias/mL. The time for 100% mortalities of the strains ABvPr11, ABvPr8, ABvSr4 y ABvPr3 were 12, 14, 14 y 16 days respectively. In the tenth day significant differences were observed between the mortality of the strains ABvPr11 (90%) and ABvSr4 (74%), ABvPr8 (72%), ABvPr3 (64,6%). Lethality time was determinate for the 50% (TL 50 ) of the locust population: ranging from 8,38 to 9,16 days. Lethality time for the 80% (TL 80 ) ranged from 9,6 to 11,5 days. The ABvPr11 strain presented the highest biocidal activity for the Schistocerca piceifrons peruviana L.A.
ResumenSe evaluó la patogenicidad y virulencia sobre Dysdercus peruvianus de una cepa de Acremonium y una AbstractWe assessed the pathogenicity and virulence on Dysdercus peruvianus with a strain of Acremonium and one of Scopulariopsis isolated from infected adult D. peruvianus from Mala, Cañete, south of Lima. A strain of Beauveria sp., isolated from Schistocerca piceifrons peruviana from Ayacucho, was also evaluated. Bioassays were conducted on the fourth instar nymphs of D. peruvianus, and the concentrations used were 3,7 x108 , 1,9 x10 8 , 9,4 x10 7 conidia / mL for Beauveria sp., Acremonium sp. and Scopulariopsis sp. respectively. At 20 days after treatment, the highest mortality rates were caused by Beauveria sp. (83,3%) and Acremonium sp. (80%). Scopulariopsis sp. caused a mortality of 23,3%. Acremonium sp. was the more aggressive strain with a lethal time (LT50) of 3,8 days.
Hongos con actividad ligninolitica fueron aislados de la planta forrajera Calamagrostis nitidula Pilg. (Poaceae). Se utilizo el medio mínimo Czapeck conteniendo lignina (0,2%) como única fuente de carbono, los medios fueron inoculados con fracciones de C. nitidula. Posteriormente los hongos desarrollados fueron aislados en agar papa dextrosa (APD) e identificados según sus características macroscópicas y microscópicas. Se aislaron e identificaron los siguientes géneros: Alternaria, Ulocladium, Trichoderma, Cephalosporium, Helicomyces, Mucor y Aspergillus. La capacidad de degradación de lignina fue determinada cualitativamente y cuantitativamente, inoculando cada cepa obtenida en tubos con caldo Czapeck con 0,2% de lignina y 1% de glucosa. La cepa PD5F identificada como Aspergillus melleus Yukawa fue la única con actividad ligninolitica.Palabras claves: Degradación ligninolítica, Calamagrostis nitidula, Aspergillus melleus, lignina, ligninasas. AbstractWe isolated fungi with ligninolytic activity of the forage plant Calamagrostis nitidula Pilg. (Poaceae). The minimum Czapeck medium containing lignin (0,2%) as carbon source, was inoculated with fractions of C. nitidula. Subsequently, the fungus developed were isolated in potato dextrose agar (PDA) and identified according to their macroscopic and microscopic characteristics. The following genus were isolated and identified: Alternaria, Ulocladium, Trichoderma, Cephalosporium, Helicomyces Mucor and Aspergillus. Degradation of lignin was determined qualitatively and quantitatively, by inoculating each strain obtained in tubes with Czapeck medium with 0,2% lignin and 1% glucose. Only the PD5F strain identified as Aspergillus melleus Yukawa was ligninolytic activity.
Resumo-Este artigo apresenta uma plataforma de medição do diagrama de irradiação de antenas de microondas utilizando dois motores de passos, com seus passos e direções de rotações remotamente controladas por um transmissor infravermelho, através de um módulo receptor integrado ao Arduino. Este protótipo amplia o conjunto de grandezas de medidas, possibilitando a realização de medições das antenas miniaturizadas tanto no plano horizontal quanto no plano vertical, e possivelmente o diagrama tridimensional com baixo custo de implementação.
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