Effects of the Seeds of Ziziphus spinosa Hu on the lmmune Function of Mice Effects of Ziziphus spinosa Hu on Serum Lipoprotein and Experimental Atherosclerosis Effects of Seeds,Leaves and Fruits of Ziziphus Spinosa and Jujuboside A on Central Nervous System Function Study on Systematic Relationships of Ziziphus jujuba and Ziziphus spinosa Using RAPD Technique