中国紫色土的微结构研究——兼论在ST制土壤基层分类上的应用

紫色土在中国南方广泛分布 ,是一类宝贵的农业土壤资源。根据中国典型省区代表性紫色土的微结构研究结果 ,提出了 12种土壤微垒结类型及其鉴别指标 ,在此基础上研究和分析了中国紫色土主要分布区紫色土的微结构类型和特征。在按美国土壤系统分类制 (ST制 )对紫色土进行基层分类中 ,应用土壤微结构研究成果 ,有一定新意 ,且对丰富和提高土壤分类的内容和水平有一定价值 。

Impact of Chinese social transformation on the reform of social st）orts management system

China after the efforts of reform and opening up for 30 years, has established a relatively complete featuring system of sports administration, providing a system of protection for sports development in China. With the further improvement of the socialist market economy, the existing sports administrative functions are incompatible with the economic and social side of the market gradually. The current sports administrative functions can no longer adapt to the development and deeper reforms of sports system are imminent. Only by speeding up the reform of sports administration, can eliminate obstacles and promote rapid and healthy development of China＇s sports industry. In this paper, the object is the administrative functions of the sport in the social transformation period, through expert interviews, literature, and logical analysis, comparative study to discuss the problems of the administrative functions of sport in the social transformation period and propose appropriate countermeasures. Studies suggest that： sports administration departments should focus to implementing national policies, the development of the sports industry policy research and development planning, management and delivery of services. In accordance with the uniform principles of responsibility, rights and interests, to further clarify the responsibilities of all levels of sports administration, handling good working relationship between them. By Complete separation between rowing and steering, governance and administration, government and industry, to achieve ＂four transformations＂, and to break plan ＂all-round＂ type of government in the economic system, and establish ＂limited＂ government, effectively carry out the functions of guidance, policy regulation, market supervision, social management and public services.

Legionella from Environmental and Clinical Homes for the Mentally Disabled and Comparison of Their Sequence Types

In this study the authors compared the sequence types （STs） designed by sequence based typing （SBT） of 4 clinical and 12 environmental strains of Legionella pneumophila serogroup 1 （LP1） which were isolated from hospital facilities for the mentally disabled. The strains were selected after a retrospective surveillance of 565 clinical records （2002-2009） and investigations of water circuit. It was possible to correlate two clinical strains with the corresponding environment, which were collected from showers that had exposed the patients （ST685, ST16） and two clinical strains present in the same structure （STI）. The other environmental strains were isolated from water in the department with confirmed or suspected clinical cases. All the strains （seven） from the first structure had ST188; two from the second structure had ST34; and the last from the third structure, gave an ST694. The results were compared with the European Working Group for Legionella Infections （EWGLI） database： the ST 1, 16, 34 and 188 were already known in literature, among clinical and nosocomial cases, especially for ST 1, the most distributed worldwide. Two STs were new to the database. ST685 was isolated both from a patient and from the water; ST694, which was found exclusively in the environmental compartment of a control structure （no cases of legionellosis and low number of nosocomial pneumonia）, was unknown in the literature and the authors could only speculate on its possible minor virulence and/or distribution. The implementation of SBT and international comparisons may be useful to gain genotypic knowledge of circulating environmental strains, also verifying their presence in the clinical setting.

Preparation and evaluation of nano-hydroxyapatite/poly(styrene-divinylbenzene) porous microsphere for aspirin carrier

A novel vehicle for the delivery of aspirin （ASA） was prepared from porous nano-hydroxyapafite/poly（styrene-divinylbenzene） [nano-HAP/P（St-DVB）] composite microspheres by grafting nano-HAP [Ca10（PO4）6（OH）2] onto porous P（St-DVB） micro- spheres. Four types of porous composite microspheres were prepared, each with different nano-HAP contents. The ASA-loaded composite microspheres prepared with 10% and 15% nano-HAP （mass ratio） exhibited excellent buoyancy with relatively short instantaneous floating time （within l0 min） and a long sustained floating time （12 h） in simulated gastric juice. They also offered good sustained release of ASA （up to 8 h）. Furthermore, these composite microspheres displayed good buff- ering capacity that prevented the buildup of acidity caused by hydrolysis of ASA, keeping the pH of gastric juice within the normal range （pH 0.9 to 1.5）. The results showed that porous nano-HAP/P（St-DVB） composite microspheres prepared with 10% and 15% nano-HAP could be used as a novel drug carrier for ASA, providing a sustained release dose without leading to stomach irritation, a side effect that is often associated with ASA medication.