The character of the definition of the Permian-Triassic boundary is discussed in detail. Based on the research on conodonts and other fossils, graphic correlati
We have demonstrated for the first time that (ⅰ) mouse Sertoli cells predominantly secrete tPA under the action of FSH and cAMP-generating agents, whereas Leyd
A general method for automated de novo deduction of protein structure from 2D NMR has been developed. The algorithms which extract simple spin coupling topologi