279 research outputs found
Aportes para el manejo del aula: 10 pautas básicas para el profesor novato de escuela secundaria
Es esencial para todo docente en formación o novato desarrollar aquellas disposiciones personales y profesionales que le permitan manejar efectivamente sus clases y optimizar los procedimientos que resultan conducentes al aprendizaje de los contenidos de sus asignaturas. El presente artículo provee un andamiaje para facilitar la adquisición de ese know how o "saber hacer" expresado en nociones básicas a considerar frente a situaciones áulicas posibles, y sugiere pautas claras de acción para guiar a los educadores que se inician en el ejercicio de la profesión
Social Transfer of Pathogenic Fungus Promotes Active Immunisation in Ant Colonies
Social contact with fungus-exposed ants leads to pathogen transfer to healthy nest-mates, causing low-level infections. These micro-infections promote pathogen-specific immune gene expression and protective immunization of nest-mates
Nitrate regulates floral induction in Arabidopsis, acting independently of light, gibberellin and autonomous pathways
The transition from vegetative growth to reproduction is a major developmental event in plants. To maximise reproductive success, its timing is determined by complex interactions between environmental cues like the photoperiod, temperature and nutrient availability and internal genetic programs. While the photoperiod- and temperature- and gibberellic acid-signalling pathways have been subjected to extensive analysis, little is known about how nutrients regulate floral induction. This is partly because nutrient supply also has large effects on vegetative growth, making it difficult to distinguish primary and secondary influences on flowering. A growth system using glutamine supplementation was established to allow nitrate to be varied without a large effect on amino acid and protein levels, or the rate of growth. Under nitrate-limiting conditions, flowering was more rapid in neutral (12/12) or short (8/16) day conditions in C24, Col-0 and Laer. Low nitrate still accelerated flowering in late-flowering mutants impaired in the photoperiod, temperature, gibberellic acid and autonomous flowering pathways, in the fca co-2 ga1-3 triple mutant and in the ft-7 soc1-1 double mutant, showing that nitrate acts downstream of other known floral induction pathways. Several other abiotic stresses did not trigger flowering in fca co-2 ga1-3, suggesting that nitrate is not acting via general stress pathways. Low nitrate did not further accelerate flowering in long days (16/8) or in 35S::CO lines, and did override the late-flowering phenotype of 35S::FLC lines. We conclude that low nitrate induces flowering via a novel signalling pathway that acts downstream of, but interacts with, the known floral induction pathways
Contribuição ao conhecimento dos algas do gênero Euglena (Euglenophyceae) no município do Rio de Janeiro e arredores, Brasil
Valsartan 160/HCTZ 25 bei hypertensiven Patienten ohne hinreichende Blutdruckkontrolle durch AT1-Rezeptor Antagonisten mit niedrig dosiertem HCTZ
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