Deisy Vanessa Calvillo Ortiz - Academia.edu (original) (raw)
Uploads
Papers by Deisy Vanessa Calvillo Ortiz
Ingeniare. Revista chilena de ingeniería
Estudio de los mecanismos de fractura de un acero de bajo carbono ante diferentes estados de carg... more Estudio de los mecanismos de fractura de un acero de bajo carbono ante diferentes estados de carga biaxial empleando un dispositivo tipo Arcan Study of fracture mechanics on low carbon steel under different biaxial loading states using an Arcan type device
Physiological and Molecular Plant Pathology, 2008
Secondary metabolites play a pivotal role in the antagonistic activities of some biocontrol speci... more Secondary metabolites play a pivotal role in the antagonistic activities of some biocontrol species of Trichoderma resulting in the suppression of plant pathogens, but their involvement in complex interactions with plants has not been specifically studied. In this work the major secondary metabolites produced by biocontrol strains of Trichoderma (T. harzianum strains T22, T39 and A6, and T. atroviride strain P1) have been investigated for their effect on plant growth promotion. An auxin-like activity was observed on etiolated pea (Pisum sativum) stems treated with harzianolide and 6-n-pentyl-6H-pyran-2-one (6PP), which also affected the growth of tomato (Lycopersicum esculentum) and canola (Brassica napus) seedlings. The ability of these molecules to induce systemic defence responses in planta was also investigated. Tomato and oilseed rape seedlings were treated with the metabolites and then inoculated with a spore suspension of Botrytis cinerea or Leptosphaeria maculans, respectively. In both cases, a reduction of disease symptoms was observed, particularly on 6PP-treated plants. Moreover an over-expression of pathogenesis-related (PR) proteins was also detected in treated plants. These results clearly indicate that secondary metabolites of Trichoderma spp. may have a role in both plant growth regulation and activation of plant defence responses.
Academia y Virtualidad, 2015
En este trabajo se analizan las diferencias en los resultados en las pruebas Saber Pro de egresad... more En este trabajo se analizan las diferencias en los resultados en las pruebas Saber Pro de egresados de administración de empresas de modalidad presencial y virtual de dos instituciones colombianas de Educación Superior. Las dos instituciones comparadas se ubican en promedios históricos cercanos en la prueba Saber Pro del ICFES. Se descargaron bases de datos de los resultados de las pruebas Saber Pro de ambas instituciones del sistema FTP-ICFES y se operó con los puntajes numéricos, los nombres de las instituciones y la modalidad o metodología virtual o presencial de sus estudiantes, de los estudiantes de administración de empresas de ambas instituciones. Se evidenciaron más diferencias entre instituciones que entre modalidades en los resultados de los egresados.
Ingeniare. Revista chilena de ingeniería
Estudio de los mecanismos de fractura de un acero de bajo carbono ante diferentes estados de carg... more Estudio de los mecanismos de fractura de un acero de bajo carbono ante diferentes estados de carga biaxial empleando un dispositivo tipo Arcan Study of fracture mechanics on low carbon steel under different biaxial loading states using an Arcan type device
Physiological and Molecular Plant Pathology, 2008
Secondary metabolites play a pivotal role in the antagonistic activities of some biocontrol speci... more Secondary metabolites play a pivotal role in the antagonistic activities of some biocontrol species of Trichoderma resulting in the suppression of plant pathogens, but their involvement in complex interactions with plants has not been specifically studied. In this work the major secondary metabolites produced by biocontrol strains of Trichoderma (T. harzianum strains T22, T39 and A6, and T. atroviride strain P1) have been investigated for their effect on plant growth promotion. An auxin-like activity was observed on etiolated pea (Pisum sativum) stems treated with harzianolide and 6-n-pentyl-6H-pyran-2-one (6PP), which also affected the growth of tomato (Lycopersicum esculentum) and canola (Brassica napus) seedlings. The ability of these molecules to induce systemic defence responses in planta was also investigated. Tomato and oilseed rape seedlings were treated with the metabolites and then inoculated with a spore suspension of Botrytis cinerea or Leptosphaeria maculans, respectively. In both cases, a reduction of disease symptoms was observed, particularly on 6PP-treated plants. Moreover an over-expression of pathogenesis-related (PR) proteins was also detected in treated plants. These results clearly indicate that secondary metabolites of Trichoderma spp. may have a role in both plant growth regulation and activation of plant defence responses.
Academia y Virtualidad, 2015
En este trabajo se analizan las diferencias en los resultados en las pruebas Saber Pro de egresad... more En este trabajo se analizan las diferencias en los resultados en las pruebas Saber Pro de egresados de administración de empresas de modalidad presencial y virtual de dos instituciones colombianas de Educación Superior. Las dos instituciones comparadas se ubican en promedios históricos cercanos en la prueba Saber Pro del ICFES. Se descargaron bases de datos de los resultados de las pruebas Saber Pro de ambas instituciones del sistema FTP-ICFES y se operó con los puntajes numéricos, los nombres de las instituciones y la modalidad o metodología virtual o presencial de sus estudiantes, de los estudiantes de administración de empresas de ambas instituciones. Se evidenciaron más diferencias entre instituciones que entre modalidades en los resultados de los egresados.