A continuación se transcribe la investigación realizada por Bernard. Lee detenidamente y haz anotaciones relevantes.
“Trajeron un día a mi laboratorio dos conejos procedentes del mercado. Los colocaron sobre una mesa donde orinaron y observé, por casualidad, que la orina era clara y ácida. Este hecho me sorprendió porque los conejos en su calidad de herbívoros, tienen la orina revuelta o turbia y alcalina, mientras que los carnívoros la tienen clara y ácida. Esta observación me hizo pensar que esos animales debían estar en las condiciones alimenticias de los carnívoros. Supuse que llevarían mucho tiempo sin comer y que, por esa razón, se encontrarían en la condición de verdaderos carnívoros, viviendo de su propia sangre. Nada más fácil que comprobar por la experiencia esta idea preconcebida. Dí hierba a los conejos y algunas horas después sus orines se habían hecho turbios y alcalinos. Sometí en seguida a los conejos a la abstinencia y, después de veinticuatro o treinta y seis horas, cuando más, sus orines volvieron a ser claros y ácidos, y así alternativamente, según se les diera hierba. Repetí esta misma experiencia tan sencilla un gran número de veces, siempre con el mismo resultado. La repetí enseguida con el caballo, animal herbívoro también, que tiene la orina igualmente turbia y alcalina. Ví que como en el conejo, la abstinencia producía una pronta acidez en la orina con crecimiento relativamente muy considerable de la úrea, hasta tal punto que ésta cristalizaba algunas veces espontáneamente al enfriarse la orina. Como consecuencia de estos trabajos llegué a ésta conclusión general, desconocida hasta entonces:
Privados de alimentos todos los animales se nutren de carne, y sus orines son de tipo de los orines de los carnívoros de los carnívoros. Para demostrar que mis conejos no alimentados todos los animales eran efectivamente carnívoros, quedaba una contraprueba por hacer. Era necesario realizar experimentalmente un conejo carnívoro, alimentándolo de carne, a fin de ver si sus orines resultaban entonces claros, ácidos y relativamente cargados de úrea como durante la abstinencia. Para esto hice alimentar a los conejos con buey cocido frío, alimento que comen muy bien cuando no se les da otra cosa. Mi previsión fue también comprobada, y durante toda la duración de esta alimentación animal, los conejos tuvieron orines claros y ácidos”.
ACTIVIDAD:
Identifique y anote en un cuadro de doble entrada (Matríz) los pasos y las formulaciones de las fases, etapas o momentos del método científico: Observación e identificación del problema, Hipótesis, Experimentación (Primera comprobación, Segunda comprobación, etc), Generalización
Ahora ingresa a estos enlaces y luego de informarte respode a cual de los científicos se refiere este relato?
http://www.houssay.org.ar/hh/bio/_ernard.htm
http://www.houssay.org.ar/hh/1955/proylati.htm
Puedes responder en el espacio de comentarios.
32 comentarios:
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