A kind of data collection system of incremental encoders is introduced based on FPGA,proposed a way of measure velocity-the method of alterable M/T,and described the principle of the four fold-frequency subdivision,the direction-judgment and the method of measure velocity.

Comparison of Several Physiological Indexes in Diploid and Tetraploid Plant of T. mongolicum Hand;

Inducement of tetraploid Dioscorea zingiberensis;

Determination of Organic Acids of Tetraploid Isatis indigotica with High Performance Capillary Electrophoresis;

Breeding Selection of Autotetraploid EggplantⅠ.Selection of Teratogeny-inactivation Trait and Fruiting Rate;

Plant Regeneration from Isolated Microspore Culture of Autotetraploid Chinese Cabbage Brassica campestris L.ssp pekinensis (Lour.)Olsson;

Study on Stability of Autotetraploidy Grape (cv. Muscat hamburg);

In the offspring of the former cross, tetraploids, trip-loids, and diploid were obtained.

Tetraploids in Jinjiang oyster, Crassostrea rivularis, were induced by inhibiting the first polar body (PB1) with cytochalasin B (CB).

To probe into the mechanism behind the formation of tetraploids in multiploid induction of pearl oyster,chromosome behaviour in fertilized eggs of Pinctada martensii following inhibition of the first polar body(PB1) was studied with acetic orcein staining techniques.

A new alkaloids isolated from tetraploidy Banlangen;

Analyses of pollen viability and stigma receptivity of tetraploidy and diploidy of Dioscorea zingiberensis;

Tetraploidy Inducement Of Small-fruit-type Tomato with Colchicine;