The biological characteristics of Lepus timibus in captivity, such as living habit, feeding habit, nutrition composition of main food, growth and development, molting rule, were studied systematically. The results showed that there were more than 30 kinds of common plants favored by L.timibus. The linear regression equation of weight gain was y=-23.223+30.929 x. The molting sequence in spring successively was head, dorsum, ear,both sides of the chest, abdomen, limbs, tails.
[Objective] The paper was to study the synthesis technology of the intermediate for prothioconazole: 1-chloro-1-chloroacetyl-cyclopropane. [Method] With 2-acetylbutyrolactone as the raw material, 3,5-dichloro-2-pentanone was synthesized by chlorination and hydrolysis, and1-chloro-1-chloroacetyl-cyclopropane was synthesized by further cyclization and chlorination. [Result] The optimized synthetic process was determined by optimizing reaction conditions of each step. The overall yield of four-step reaction was 76.7%, and the product was verified by1 H NMR and13 C NMR. [Conclusion] The chlorinated product of 2-acetylbutyrolactone was directly hydrolyzed in acid solution without separation, and the final product was obtained by chlorination of cyclization product in the presence of special catalyst methanol. The whole process was smooth and the yield of the reaction was high, with high value for industrial application.
The epidemiology of highly pathogenic porcine reproductive and respiratory syndrome( HP-PRRS) in Changping District,Beijing City was investigated from 2010 to 2015. Through statistics of vaccine,immune procedure and antibody levels,the epidemic prevention effect of HP-PRRS in Changping District was scientifically assessed.
