1、The term"fossil"often implies petrifaction，literally a transformation into stone. “化石”这个词通常意味着石化，字面意思是变成石头。 2、Petrifaction may also involve a simultaneous exchange of the original substance of a ...

THE method described in this letter was devised in collaboration with Dr. R. G. Koopmans of Utrecht. A flat surface must first of all be cut or ground on the coal ball or other petrified mass parallel ...

PLANT tissue can be petrified by impregnation with natural waters with a high concentration of dissolved silicate1. This occurs commonly in springs issuing from volcanic deposits in New Zealand, ...

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Original Article from The New England Journal of Medicine — Petrifaction in the Corpora Striata ...