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5 results on '"Yin, Zhengyan"'

3. Serological characterization of isolates from China

Author

Zheng-Fei Liu, Patrick J. Blackall, Yin Zhengyan, Huanchun Chen, Lei Wang, Xuwang Cai, and Meilin Jin

Subjects
Serotype, Bordetella bronchiseptica, General Veterinary, biology, Pasteurellaceae, Streptococcus suis, General Medicine, biology.organism_classification, medicine.disease_cause, Microbiology, Virology, Serology, Haemophilus, medicine, Pasteurella multocida, Escherichia coli
Abstract

From September 2002 to December 2004, a total of 281 strains of Haemophilus parasuis were isolated from 17 provinces of China. All these isolates were serotyped by both the gel diffusion (GD) and the indirect haemagglutination (IHA) tests. By combining the GD and IHA results, serovar 4 (24.2%) and serovar 5 (19.2%) were the most prevalent serovars, followed by serovars 13 (12.5%), 14 (7.1%) and 12 (6.8%), while 12.1% of the isolates could not be assigned to a serovar (nontypable). A comparison of the number of isolates obtained from the respiratory tract of swine without polyserositis with those obtained from swine with polyserositis revealed an increased frequency of serovar 4 and a significantly decreased frequency of serovar 13 among isolates from the respiratory tract of swine without polyserositis, whereas the frequency of isolation of serovars 5, 12, 14 and nontypable from swine with or without polyserositis were similar. Co-infection of H. parasuis and other bacterial agents was studied in 183 cases examined from June 2003 to December 2004. Streptococcus suis (30.6%; 56), Escherichia coli (21.9%; 40), Bordetella bronchiseptica (21.3%; 39) and Pasteurella multocida (14.2%; 26) were the bacterial agents frequently co-isolated with H. parasuis in China.

Published
2005

5. [Study on synthesis of physically crosslinked biomedical polyurethane hydrogel].

Author

Yin Z, Niu H, Tan H, Xie X, and Zhong Y

Subjects
Cross-Linking Reagents chemistry, Hydrogel, Polyethylene Glycol Dimethacrylate chemistry, Polyurethanes chemistry, Biocompatible Materials, Hydrogel, Polyethylene Glycol Dimethacrylate chemical synthesis, Polyurethanes chemical synthesis
Abstract

In this study, using ethylene carbonate and ethanolamine, we synthesized a novel diol chain-extender, bis-hydroxylethyl carbomate (EC-AE), which contains carbomate structure. The polyurethanes, PUA25 and PUB25, with different extenders, EC-AE and BDO, were synthesized by one-step polymerization, respectively. Their structures were characterized by using FT-IR and DSC. The results indicated that the microphase separation degree of PUA25 was less than that of PUB25, in other words, the amount of hydrogen bonding between hard segments and soft segments in PUA25 was superior to that in PUB25. And the formation of physically crosslinked hydrogels prepared by PUA25 and PUB25 were studied in detail. It was found that only PUA25 can form hydrogel in situ from solution state by cooling. And this kind of hydrogels showed the transition cycle of "gel-sol-gel" under "cooling-heating-cooling" thermal cycles, respectively. The results suggested that the physically crosslinked polyurethane hydrogels were easily possessed in high degree of phase mixing.

Published
2006

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