[New approach in the explaining of the Morgan Law in genetics teaching].

Using the model of broad and narrow way, the paper introduces a new approach in the explaining of a few basic concepts in the Morgan Law. The paper introduces a thorough inquiry into the applying condition of the three-factor crosses, and finds the source of the difference between the crossover frequency (F(C)) and recombination frequency (F(R)) of the non-adjacent factors in the three-factor crosses in Neurospora crassa.

Inhibitory activity of polysaccharide extracts from three kinds of edible fungi on proliferation of human hepatoma SMMC-7721 cell and mouse implanted S180 tumor.

AIM:To determine the activities of polysaccharide extracts from Flammulina velutipes (Curt. ex Fr.) Sing (FV), Lentinus edodes (LE)and Agaricus bispo-rus Sing (AB) on the proliferation of human hepatoma SMMC-7721 cells in vitro and on mouse implanted S-180 tumors in vivo.