Two different types of periostraca have been found in living articulate brachiopods. These two types can be correlated to give some indication of the structure of the prototypic shell.

Wu Gong], Cicadae Periostracum [Cicadidae; Chan Tui], Eupolyphaga Steleophaga [Corydiidae; Tu Bie Chong] and Borneolum Syntheticum (Bing Pian). Detailed preparation methods and quality control ...

Oxidative Stress: Neuropathy, Excitability, and Neurodegeneration.