Griffith's experiment, animation

Référence de la vidéo 11936412
Griffith's experiment. Animation showing the basic principles of bacterial transformation, as demonstrated by Frederick Griffith in 1928. This was one of the first experiments to suggest that an organism's genetic material is encoded in DNA (deoxyribonucleic acid). Griffith injected mice with two strains of Streptocuccus pneumoniae bacteria: a harmless strain (type R, blue) and a virulent strain (type S, red). He also used a heat-killed sample of the virulent type S strain (yellow), which did not kill any mice. When the type R bacteria and the heat-killed type S bacteria were injected together, the mice died, even though neither strain alone harmed them. This showed that the type R bacteria had been 'transformed', and had taken up the DNA of the heat-killed type S strain. For a labelled version of this animation, see K004/0931.
Licence : Droits gérés
Crédit : Science Photo Library / Biocosmos / Francis Leroy & Nathan Petit
Model Release : Non requis
Durée : 45 Secondes
Aspect ratio : 16/9
Restrictions : -

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