The DNA of twelve waxy maize self-lines bred by Guizhou Institute of Upland Crops was determined by 30 SSR markers to study allelic variation of these SSR markers loci and the blood relationship between 12 tested waxy maize self-lines.

【Conclusion】Variation of PPO activity in Chinese wheat micro-core collections is obvious,and the allelic variation of PPO genes induced a significant effect on grain PPO activity.

The effects of active molecule and repressive molecule on the binding process of allosteric enzyme and substrate are discussed by considering the heterotropic effect of the regulating molecule that binds to allosteric enzyme.

Expression on equivalent stress and equivalent strain of wall rock state of tunnel;

Analysis on flow velocity and equivalent strain of the metal in the process of liquid extrusion;

Establishment and analysis of equivalent stress-equivalent strain curves of sheet metal

The result of the effective strain and the effective stresss in cavity die circular section is caculated by simulating the cup drawing in different states cosidering strain, stress and thickness changes.

The effect of billet size on the effective strain and unit extrusion pressure was investigated during equal channel angular pressing.

The billet flow,effective strain,extrusion stress and velocity distribution of 1100Al was investigated using finite element simulation in acute die channel angle.