lnterleukin-21(IL-21)is a recently characterized T cell-derived cytokine with a significant homology to IL-2,IL-4 and IL-15.To determine whether IL-21 has broa
In order to study vegetation evolution and en- vironmental change since the Last Glacial Maximum (LGM), a total of 180 pollen samples with an average time resol
A low-frequency debris flow took place in the north coastal range of Venezuela on Dec. 16, 1999, and scientists all over the world paid attention to this cat
The mass extinction at the end-Triassic is one of the five biggest in the Phanerozoic. However,it is the least well understood among these five events, and only
The linear model based on the hydraulic pressure vibrator has been no longer adaptable to the electromagnetic vibrator. In order to realize the effective transm