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Methods and Effects of Hongshan Cock Spermatozoa Cryopreservation

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Wuhan University Journal of Natural Sciences 2006年第2期11卷 447-450页

作者： LIU Jianzhong ZHANG Yiling College of Chemical Engineering and Technology Wuhan University of Science and Technology Wuhan 430081 Hubei China College of Animal Science and Technology Northwestern University of Science and Technology in Agriculture and Forest Yangling 712100 Shannxi China

The survival rates, acrosomic integrity rates of frozen semen from Hongshan cock and fertilities of the frozen-thawed spermatozoa in both pellets and straws were studied. The result shows that the average survival rate of spermatozoa in straws was 0, 451±0, 056, and 0. 390±0. 040 in pellets, the former was significantly higher than the later （n=20, p〈0, 01）, The average acrosomic integrity rate of the sperms was 0, 613±0. 049 in straws, and 0. 476±0. 057 in pellets. The former was significantly higher than the later （n= 20, p〈0.05）. The fertility rates （%） of sperms in pellets, straws and freshly colleered semen at the third day after artificial insemination （AI） were 85.32±2. 32, 87. 73±1.00 and 90.77±1.68, respectively. The fertility rate,s of the three types of semen at the fourth and fifth days were lower than the third day＇s. Variance analysts shows that the fertilities of the spermatozoa in pellets and straws were significantly lower than freshly collected semen （n=3, p〈0.01）, and the fertilities of the spermatozoa in straws were significantly higher than those in pellets （n= 3, p〈0.01）.

关键词： Hongshan cock ,spermatozoa cryopreservation fertilities

A Novel Cache Invalidation Scheme for Mobile Networks

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Wuhan University Journal of Natural Sciences 2006年第2期11卷 394-398页

作者： TAN Jin ZHU Guangxi LIU Jibin Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan 430074 Hubei China

In this paper, we propose a strategy of maintaining cache consistency in wireless mobile environments, which adds a validation server （VS） into the GPRS network, utilizes the location information of mobile terminal in SGSN located at GPRS backbone, just sends invalidation information to mobile terminal which is online in accordance with the cached data, and reduces the information amount in asynchronous transmission. This strategy enables mobile terminal to access cached data with very little computing amount, little delay and arbitrary disconnection intervals, and excels the synchronous IR and asynchronous slate （AS） in the total performances.

关键词： mobile terminal cache consistency invalidation report mobile computing

Production process for ursolic acid

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化工学报 2006年第2期57卷 380-381页

作者：李开泉陈武李翔一 Yichun College Yichun 336000 Jiangxi China

Production of ursolic acid, the anti-hepatitis effective composition from natural plant,Sambucus chinensis *** carried out and the scale-up preparation technology was *** of the herb Sambucus chinensis *** extracted in reflux with 7 volume times of refluxing ethanol at 80℃ for 1 h for two *** extract was purified with a selt-made specific impurity remover “YCXY-1” to yield ursolic acid of high purity.A new “Extraction/Gelation” technology for the production of ursolic acid was developed. The specific impurity remover “YCXY-1” showed high effectiveness in purification. The purity of the mass-produced ursolic acid was up to 99.8%. The chemical structure of the product was confirmed by the physicochemical constants and spectroscopic identification. The production of high-purity ursolic acid was optimized with natural plant as raw material and with only ethanol as extracting solvent. The difficulties such as isolation and impurity removal were addressed effectively. The novel technology is reasonable, convenient, practical, low-cost, high-yield, suitable for mass production.

关键词：乌索酸生产工艺抗肝炎中药提取分离