In 1962, the presence of penicillinase was detected in dormant endospores of Bacillus licheniformis, revived from dried soil on the roots of plants, preserved since 1689 in the British Museum.
En 1962, detectouse a presenza de penicilinase en endósporas dormentes de Bacillus licheniformis, revividas de solo seco entre raíces das plantas, conservadas desde 1689 no Museo Británico.