El osteosarcoma es un cáncer de hueso maligno que se origina en las células que forman los huesos. Es el tipo más común de cáncer óseo en niños y adolescentes.
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El osteosarcoma es un cáncer de hueso maligno que se origina en las células que forman los huesos. Es el tipo más común de cáncer óseo en niños y adolescentes.

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A skeleton of conjoined twins at the Mütter Museum in Philadelphia. (Via Morbid Anatomy)
Hace dos siglos, se creÃa que las contracciones musculares y la rigidez eran 'posesiones demonÃacas'. En la actualidad, sabemos que son sÃntomas del tétanos, causado por la bacteria Clostridium tetani, que afecta al sistema nervioso y provoca una postura conocida como opistótonos. La ciencia nos permite entender estos fenómenos de manera lógica.
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Bacterial flagellar motor
The bacterial flagellar motor (BFM) is a rotary molecular motor embedded in the cell membrane of numerous bacteria. It turns a flagellum which acts as a propeller, enabling bacterial motility and chemotaxis. The BFM is rotated by stator units, inner membrane protein complexes that stochastically associate to and dissociate from individual motors at a rate which depends on the mechanical and electrochemical environment. Stator units consume the ion motive force (IMF), the electrochemical gradient across the inner membrane that results from cellular respiration, converting the electrochemical energy of translocated ions into mechanical energy, imparted to the rotor.Â

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Epifisis Vs Metafisis
La metafisis es mas resistente... aqui podemos ver las consecuencias de isquema dependiendo la zona, cuidado con la pierna mas larga o chueca