The Research Progress on Stage-difference Expression of Functional Gene in Schistosome
Schistosome antigen expression obviously has stage-specific characteristic in its life cycle. Through molecular biological technology, selecting interested functional proteins from stage-specific expression of functional gene and deeply studying their biological activity have been focused on schistosome genome in recent years. It has great significance for us to develop new vaccines and seek new drugs against schistosome and to prevent/control schistosomiasis. This review summaried the recent research progress on the stage-specific expression of functional gene in Schistosma.Some biological technigues that would be used in schistosome-specific gene’s cloning briefly introduced simultaneously.
This paper considers a method to realize a two-valued input three-valued output function f:{0, 1}/sup n//spl rarr/{0, 1, 2} by using a cascade of four-input cells. Decomposition of a group function is used to find a canonical form. We show that the Walsh spectrum specifies the canonical form, and the number of non-zero coefficients in the spectrum is proportional to the number of cells in the cascade. Finally, we show a design algorithm for a p-valued function f:{0, 1}/sup n//spl rarr/{0, 1, ..., p-1}. The designed cascades are reversible and conservative.