Comunicação e educação: implicações contemporâneas
This essay continues to spread and systematize new data collected in the research conducted between 2006 and 2009 with fundamental and medium term teachers from public schools in the city and state of Sao Paulo. The intent, now, is to question about the tensions that surround the relationship between teacher’s professional practice and actual circumstances of the social media field.
Esquema para el análisis de la mediatización
La juventud no es para los argentinos de 15 a 25 un grupo social bien delimitados. Mucho menos ese lugar de pertenencia tan idealizado por sus mayores. Navegantes sin rumbo de una crisis que sacude a la mayor parte de la sociedad, a veces se sienten mas cerca de un adulto desempleado que de otro chico de su edad que no ha conseguido su primer empleo y logra mantenerlo. No. La palabra "juventud" no les suena a comunidad de intereses. Es solo una etapa de la vida. Tanto que, se dice, estan dispuestos a definirse como "adultos inmaduros". 
Mantienen relaciones cordiales con sus padres y, cuando pueden, colaboran con los gastos de la casa. No creen en las marcas, no idealizan el consumo y revalorizan el ahorro. El fantasma de la falta de trabajo les quita el sueno, pero tienen una fuerte voluntad de futuro. Sus principales valores son la autenticidad, la sinceridad y la honestidad y, salvo escasas excepciones, dicen no tener modelos que imitar. 
Ellos no creen en las instituciones ni en ningun proyecto colectivo pero apuestan firmemente a un futuro con valores tradicionales: formar una familia, tener hijos, comprar casa y auto... y poder mantenerlos. O crecer en la profesion. Son racionales y tienden al equilibrio y a la moderacion, sus normas generales de conducta en todos los aspectos de su vida. ?De que otra forma sobrevivir en la marejada?
Production of xylanase by Aspergillus awamori on complex medium in stirred tank and airlift tower loop reactors
Abstract Aspergillus awamori was cultivated on complex medium containing wheat bran as sole carbon source in the precultures as well as in the main cultures in stirred tank and airlift tower loop reactors. The decomposition of the wheat bran particles by α -amylase and xylanase produced by the fungus was investigated by monitoring the enzyme activities, the CO 2 production rate, the concentrations of reducing sugars, glucose, xylose, phosphate and ammonium as well as by applying transmission electron microscopy. By applying synthetic medium in the preculture, the time lag was longer, the growth faster, the xylanase activity higher in the main culture, than by using wheat bran in the preculture. With increasing the stirrer speed the intimate contact between the pellets and the wheat bran was reduced, which caused a decrease of the growth and the xylanase production. By applying ground wheat bran, filamentous mycelium was formed, the growth and the substrate uptake rates increased, but the xylanase production decreased due to the less intimate contact between the fungus and the wheat bran. In the airlift tower loop reactor filamentous mycelium was formed due to the low specific power input. In spite of the high medium viscosity, high xylanase productivity was obtained. With ground wheat bran the particles were completely covered by filamentous mycelium, medium viscosity strongly increased and as consequence the growth and xylanase production decreased.