New strains obtained after UV treatment and protoplast fusion of native Trichoderma harzianum: their biocontrol activity on Pyrenochaeta lycopersici

Indexación: ScieloThe obtainment of 30 new strains from native Trichoderma harzianum after UV light irradiation (UV-A and UV-C), and of 82 strains resulted from protoplast fusion were accomplished. The new strains, initially selected for their growing rate under low temperature and high pH conditions, as well as for their innocuousness on tomato plants, were tested for in vitro inhibition of Pyrenochaeta lycopersici in dual cultures and due to secretion of volatile and diffusible metabolites. All the UV-A and UV-C selected candidate mutants were innocuous to tomato plants, but none of them showed improvement in their biocontrol activity on P. lycopersici. Th12A20.1 increased 1.3 and 1.9 fold the total fresh weight of Fortaleza tomato plants when compared to its parental strains Th12 and Th11, respectively. The selected candidate mutants obtained through protoplast fusion were also innocuous to tomato plants, but only ThF1-2 and ThF4-4 inhibited 1.3 fold (in dual cultures) and 5 fold (due to secretion of volatile metabolites) the growth of P. lycopersici, respectively, in relation to the mean inhibitory effect of both parents. Therefore, these candidate mutants could be included in experiments under field conditions

Enfoque del tratamiento de la Salud Mental en los últimos 70 años en Bs As, Argentina

Objetivos: evaluar el impacto terapéutico y costos asociados a tratamientos de patología mental en los últimos 70 años. Metodología: estudio retrospectivo-descriptivo con etapa analítica en el cual se evaluaron historias clínicas de pacientes internados en Institución de Salud Mental de Buenos Aires. Las variables analizadas fueron: edad, sexo, motivo de internación, promedio de estadía, re-internaciones, número y tipo de medicamentos por década, resultados en términos de mejoría clínica, costo de medicamentos e internaciones en cada década

New strains obtained after UV treatment and protoplast fusion of native Trichoderma harzianum : their biocontrol activity on Pyrenochaeta lycopersici

The obtainment of 30 new strains from native Trichoderma harzianum after UV light irradiation (UV-A and UV-C), and of 82 strains resulted from protoplast fusion were accomplished. The new strains, initially selected for their growing rate under low temperature and high pH conditions, as well as for their innocuousness on tomato plants, were tested for in vitro inhibition of Pyrenochaeta lycopersici in dual cultures and due to secretion of volatile and diffusible metabolites. All the UV-A and UV-C selected candidate mutants were innocuous to tomato plants, but none of them showed improvement in their biocontrol activity on P. lycopersici. Th12A20.1 increased 1.3 and 1.9 fold the total fresh weight of Fortaleza tomato plants when compared to its parental strains Th12 and Th11, respectively. The selected candidate mutants obtained through protoplast fusion were also innocuous to tomato plants, but only ThF1-2 and ThF4-4 inhibited 1.3 fold (in dual cultures) and 5 fold (due to secretion of volatile metabolites) the growth of P. lycopersici, respectively, in relation to the mean inhibitory effect of both parents. Therefore, these candidate mutants could be included in experiments under field conditions

Estrategias didácticas para el diseño de productos con biomateriales

These pages describe some teaching strategies designed by a team of teacher-researchers from the University of Buenos Aires (UBA) in Argentina, with the aim of incorporating biomaterials into the product design workshop of the Industrial Design career. These proposals are accompanied by application tools that are essential for the implementation of each activity. The purpose of teaching design with biomaterials is to make students aware of the materiality in their future projects, in addition to raising awareness about environmental consequences of misusing available resources on the planet. Some testing experiences carried out during 2019, 2020 and 2021 in the Faculty of Architecture, Design and Urbanism let the team realize some significant conclusions. The challenge of using discarded materials at home lets students recognize their local identities through the analysis of the material resources.Se describen las estrategias didácticas diseñadas por un equipo de docentes- investigadorxs de la Universidad de Buenos Aires (UBA), en Argentina, con el objetivo de favorecer la incorporación de biomateriales a la enseñanza de diseño de productos en un taller práctico-reflexivo correspondiente a la carrera de grado en Diseño Industrial. Dichas estrategias están acompañadas por herramientas de aplicación que resultan indispensables para la puesta en práctica de las actividades propuestas. La enseñanza de diseño con biomateriales tiene por finalidad sensibilizar a lxs estudiantes en el abordaje de la materialidad de sus proyectos futuros, además de generar conciencia sobre las consecuencias medioambientales del mal uso de los recursos disponibles en el planeta. A través de algunas experiencias piloto realizadas durante los años 2019, 2020 y 2021 en el Taller de Diseño Industrial de la Cátedra Sanguinetti, en la Facultad de Arquitectura, Diseño y Urbanismo de la UBA, se ha arribado a algunas conclusiones significativas. El desafío planteado a lxs estudiantes de usar únicamente descartes disponibles en sus hogares ha derivado en un sorprendente reconocimiento de las diferentes identidades a partir del análisis de los recursos materiales locales