1肺炎链球菌转化实验 Heal. led L 5 and A str soled fiom dead 4! Figure l3I Griffith's Transformation Experiments. (a)Mice died of po jected with pathogenic strains of S pneumococci. which have a capsul and form sooth- looking colonies (b) Mice survived when nonpathogenic strain of R pncumoceca which lacks a capsule and forms tough colonies (e) Injection with beat- killed strans of S picumocooci had no effect (d) Injectin with a live R stram and a heal-kuilled S strain gave the mice pneumonia, and live S strain pneumococci could be isolated from the dead mice.1.肺炎链球菌转化实验