The present study aims to select fungal strains having improved lipolytic activity in castor oil and see if its crude enzyme obtained by fermentation in liquid substrate (FSL) has the same activity on castor oil. Nine strains were isolated from fungi, Penicillium sp eight and one Aspergillus sp from waste vegetable oils. The results show that all studied strains of degradation halos developed, however, in no case was the halos of crude enzymatic degradation. The work showed that the strains of Penicillium sp and Aspergillus sp had a better cultural growth in castor oil and a good plate hydrolysis activity with short-chain triglyceride: tributirin.

The present study aims to select fungal strains having improved lipolytic activity in castor oil and see if its crude enzyme obtained by fermentation in liquid substrate (FSL) has the same activity on castor oil. Nine strains were isolated from fungi, Penicillium sp eight and one Aspergillus sp from waste vegetable oils. The results show that all studied strains of degradation halos developed, however, in no case was the halos of crude enzymatic degradation. The work showed that the strains of Penicillium sp and Aspergillus sp had a better cultural growth in castor oil and a good plate hydrolysis activity with short-chain triglyceride: tributirin.

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Los bosques de Polylepis (“queñual”) de la Cordillera del Vilcanota (3600-4500m) son ecosistemas que contienen una fauna y flora única, caracterizada por especialistas de hábitat y altos niveles de endemismo. Desdichadamente, éstos bosques también representan uno de los hábitats más vulnerables de los altos Andes por la fuerte presión antropogénica existente (tala para leña y materiales de construcción además de sobrepastoreo), ya que constituyen el único recurso maderable en esas alturas. Una de las mayores dificultades en la elaboración de estrategias de conservación para este ecosistema, es el gran vacío de información biológica que se tiene sobre estos bosques. El presente estudio contribuye con información básica dirigida al conocimiento de cuatro localidades de estudio nuevas o poco documentadas para la Cordillera del Vilcanota: Sacsamonte, Yanacoch...

The reduced acceleration of the organic matter in the soil has been affecting its properties, making it necessary to repeat the use and management of organic fertilizers. The objective of research was to evaluate the effect of two fertilizers application, Island Guano (IG) and sheep manure (SM), on the following three physical properties of the soil: bulk density, water-stable aggregates and penetration resistance, under quinoa (Chenopodium quinoa Willd) cultivation, Hualhuas variety. These properties were determined by beveled cylinder, Yoder wet-sieving and dynamic cone penetrometer methods and under a completely randomized block design, with factorial arrangement of two factors (IG and SM) and three levels per factor (0; 0.5 and 1 t*ha-1 for IG and 0; 2.5 and 5 t*ha-1 for SM), nine treatments were evaluated, with three repetitions, so 27 total experimental units. Results showed that c...

The reduced acceleration of the organic matter in the soil has been affecting its properties, making it necessary to repeat the use and management of organic fertilizers. The objective of research was to evaluate the effect of two fertilizers application, Island Guano (IG) and sheep manure (SM), on the following three physical properties of the soil: bulk density, water-stable aggregates and penetration resistance, under quinoa (Chenopodium quinoa Willd) cultivation, Hualhuas variety. These properties were determined by beveled cylinder, Yoder wet-sieving and dynamic cone penetrometer methods and under a completely randomized block design, with factorial arrangement of two factors (IG and SM) and three levels per factor (0; 0.5 and 1 t*ha-1 for IG and 0; 2.5 and 5 t*ha-1 for SM), nine treatments were evaluated, with three repetitions, so 27 total experimental units. Results showed that c...

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La acelerada disminución de la materia orgánica del suelo viene afectando sus propiedades, siendo necesario reincidir en el uso y manejo de abonos orgánicos. El objetivo del presente trabajo fue evaluar el efecto de la aplicación de dos abonos orgánicos combinados, Guano de las Islas (GI) y estiércol de ovino (EO), sobre las siguientes tres propiedades físicas del suelo: densidad aparente, estabilidad de agregados y resistencia mecánica a la penetración, bajo el cultivo de quinua (Chenopodium quinoa Willd) variedad Hualhuas. Estas propiedades se determinaron mediante los métodos de cilindro biselado, Yoder y del penetrómetro dinámico y bajo un diseño en bloques completamente al azar, con arreglo factorial de dos factores (GI y EO) y tres niveles por factor (0; 0,5 y 1 t/hapara GI y 0; 2,5 y 5 t/hapara EO). Los resultados demostraron que la aplicación combinada de las difere...