The author of this paper asserts "yi" means "being constant" and is opposite to "er" by putting emphasis on the interpretation of "yi fa wu ba" in Qu Yu.

Studied the specificity of modification of amino and guandino groups by adopting sodium nitrite to react with amino groups, butadione to react with guandino groups.

Taking aconitase as an example in this paper,the mechanism of symmetric substrate molecule selected by enzyme was discussed thoroughly,and the classificatory system of enzyme specificity was analyzed and readjusted.

Amylase has a high degree of specificity,and its activity are influenced by temperature,pH,agonist and inhibitors,enzyme concentration and acting time and other factors.

Deepening of education reform of organic experiment to foster high quality persons being expert in one and good at many;

In EtOH/benzene, 2-butyn-1, 4-diol and its derivatives can be halogenated by cupric halide stereospecifically to obtain (E)-2,3-dihalo-2-buten-1,4-diol derivatives.