Low-density zeolites collapse to the rigid amorphous state at temperatures that are well below the melting points of crystals of the same composition but of conventional density. Here we show, by using a range of experimental ...

The ultrastructure of the dendroid genera Acanthograptus, Dendrograptus, Desmograptus, Ptilograptus and Dictyonena, the genus Mastigograptus, and the graptoloids Monograptus, Cyrtograptus, Neogothograptus, Paraplectograptus ...