From the role of the audience and the audience choice , this theme analyses that the audience choice affects the media reform ,media contents, media management in planned economy or market economy during the twenty years in China .

As a means of communications of public relatons are just adapted to this change meet the changes of media and marketing,and play special roles in in the transmission in internet.

Analysis of genetic variation and stability of the content of petroleum ether extracts in flue_cured tobacco leaves;

Studies on the genetic variation of 9 populations of Tricula by SSR-PCR;

Nucleocapsid protein gene′s genetic variation of Newcastle disease virus TL1 strain;

Study on genetic diversity in three northwest chicken populations;

Analysis of genetic diversity of GIFT strain Nile tilapia (Oreochromis niloticus) during selection processing by microsatellites;

Analysis on genetic diversity of four geographical populations of sea moss Gracilaria in the coast of waters south China;