Preparation of glucosamine by hydrolysis of chitosan with commercial α-amylase and glucoamylase     

Pan SK  Wu SJ  Kim JM 《Journal of Zhejiang University. Science. B》2011,12(11):931-934

Objective  

In order to overcome the defects of chemical hydrolysis approach to prepare glucosamine, an enzymatic hydrolysis method was developed.  相似文献   

A recessive gene controlling male sterility sensitive to short daylength/low temperature in wheat (Triticum aestivum L.)     

Chen XD  Sun DF  Rong DF  Peng JH  Li CD 《Journal of Zhejiang University. Science. B》2011,12(11):943-950

Utilization of a two-line breeding system via photoperiod-thermo sensitive male sterility has a great potential for hybrid production in wheat (Triticum aestivum L.). 337S is a novel wheat male sterile line sensitive to both short daylength/low temperature and long daylength/high temperature. Five F₂ populations derived from the crosses between 337S and five common wheat varieties were developed for genetic analysis. All F₁’s were highly fertile while segregation occurred in the F₂ populations with a ratio of 3 fertile:1 sterile under short daylength/low temperature. It is shown that male sterility in 337S was controlled by a single recessive gene, temporarily designated as wptms3. Bulked segregant analysis (BSA) coupled with simple sequence repeat (SSR) markers was applied to map the sterile gene using one mapping population. The wptms3 gene was mapped to chromosome arm 1BS and flanked by Xgwm413 and Xgwm182 at a genetic distance of 3.2 and 23.5 cM, respectively. The accuracy and efficiency of marker-assisted selection were evaluated and proved essential for identifying homozygous recessive male sterile genotypes of the wptms3 gene in F₂ generation.  相似文献   

Antioxidants in aqueous extract of Myristica fragrans (Houtt.) suppress mitosis and cyclophosphamide-induced chromosomal aberrations in Allium cepa L. cells     

Akinboro A  Mohamed KB  Asmawi MZ  Sulaiman SF  Sofiman OA 《Journal of Zhejiang University. Science. B》2011,12(11):915-922

In this study, freeze-dried water extract from the leaves of Myristica fragrans (Houtt.) was tested for mutagenic and antimutagenic potentials using the Allium cepa assay. Freeze-dried water extract alone and its combination with cyclophosphamide (CP) (50 mg/kg) were separately dissolved in tap water at 500, 1000, 2000, and 4000 mg/kg. Onions (A. cepa) were suspended in the solutions and controls for 48 h in the dark. Root tips were prepared for microscopic evaluation. 2,2-Diphenyl-1-picrylhydrazyl (DPPH) free radicals’ scavenging power of the extract was tested using butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT) as standards. Water extract of Myristica fragrans scavenged free radicals better than BHA, but worse than BHT. The extract alone, as well as in combination with CP suppressed cell division, and induced chromosomal aberrations that were insignificantly different from the negative control (P≤0.05). However, cytotoxic and mutagenic actions of CP were considerably suppressed. The observed effects on cell division and chromosomes of A. cepa may be principally connected to the antioxidant properties of the extract. The obtained results suggest mitodepressive and antimutagenic potentials of water extract of the leaves of M. fragrans as desirable properties of a promising anticancer agent.  相似文献   

嵌入式交互系统设计方案及其比较     

邹常青  谭家杰 《衡阳师范学院学报》2011,32(6):44-47

交互系统设计是嵌入式产品开发的重要部分。分析介绍了媒体播放器和网络电视产品中三种主要的交互系统设计的原理和框架:基于QT/MINIGUI的设计方案、基于浏览器的设计方案、基于FLASH技术的设计方案。比较了三种方案在CC1200硬件平台上的评测结果,分析了各自的优缺点和适应性。预测了交互系统设计的发展方向,为嵌入式交互系统的设计开发提供帮助。  相似文献   

紫鹊界梯田旅游开发模式研究     

王鹏  罗意坚  邓育武  田成  罗文丽  黄政珉  唐高溶 《衡阳师范学院学报》2011,32(6)

湖南省新化县紫鹊界梯田具有2000多年历史,是南方稻作文化和苗瑶山地渔猎文化交融揉合的历史遗存。气势恢宏,景观奇特,文化内涵丰厚,有观赏、体验和教育等多方面的旅游价值。通过对紫鹊界梯田景区现状的考察,客观分析了紫鹊界梯田景区旅游发展的现状,并提出了紫鹊界梯田旅游开发的“增长极”、“点一轴”、“区域一体化”和“综合开发”等四种空间发展模式。  相似文献   

英语词汇强度知识、深度知识与阅读关系探究     

邹俊飞 《衡阳师范学院学报》2011,32(5):134-138

英语词汇知识在英语阅读理解中所起的重要作用是毋庸置疑的,但是词汇知识的框架是复杂而多维的。测量了英语学习者的词汇强度知识及词汇深度知识,以揭示英语学习者英语词汇知识的全貌,并证实了英语词汇强度知识及深度知识在阅读中所起的不同作用。文章研究结果还表明,在词汇强度知识的四个样态中积极回忆样态对阅读有最强的预测力,而词汇深度知识中的词汇意义比搭配更能预测学习者的阅读能力。  相似文献   

语言的模糊性与幽默     

陈军洲 《毕节学院学报》2011,29(10):12-16

语言的模糊性是幽默产生的前提。概念模糊(包括一词多义和一音多义)是幽默运作的机制之一。幽默至少含有两层意义,一是听者的期待,二是听者没有预期、或期待落空。幽默的语言模式包括准备、乖讹或不和谐和消解三个阶段。幽默的人际角色包括说话者,听话者,嘲笑者和被嘲笑者,但并非一一对应。幽默是发起人或说话者在面临某种"威胁"(包括面子或情感不快)时,攻击或毁谤他人,反败为胜,变弱势为优势,或自嘲以缓解威胁,并给被嘲笑者保留一定面子的策略。  相似文献   

拓展在高校高知识群体中发展党员有效途径的研究     

苏世乙 《贺州学院学报》2011,27(4):15-18

党中央历来十分重视高校高知识群体在国家经济和社会发展中的重要作用,要求和改进高校高知识分子的培养、教育和引导工作,努力把他们当中最优秀的人员争到党的队伍中来。本文在调查的基础上,分析了高校高知识群体组织发展工作现状,探讨了培养和发展高校高知识群体入党的新路径、新方法和新实践,以期让更多的高知识分子凝聚在党的周围,发挥先锋模范作用,做党的路线方针政策的忠实拥护者、宣传者和实践人。  相似文献   

Ugandan health libraries in the 21st century: key initiatives and challenges     

Alison Annet Kinengyere 《Health information and libraries journal》2019,36(2):185-189

This article is part of a series in this regular feature which looks at new directions in health science libraries. This paper highlights new initiatives aimed at ensuring health libraries can contribute to the development of Uganda in the 21st century and the challenges facing libraries. It stresses that for libraries to be successful they need to form networks and collaborations for resource sharing; take advantage of the benefits of information technology; computerise their library systems; as well as invest in the development of staff. The paper highlights the main challenge facing the library service as inadequate funding both from government for public‐funded health libraries and the private sector (for privately funded health libraries). The paper concludes that, despite the bottlenecks brought about by inadequate funding, Ugandan health libraries have taken positive steps to support health research and education, as well as patient care, not just for Uganda, but for the whole of the East African region. J.M.  相似文献   

Provision of consumer health information in Alberta's Rural Public Libraries   总被引：1，自引：0，他引：1  

Georges Danhoundo  Doug Whistance‐Smith  Daniel Lemoine  Jill Konkin 《Health information and libraries journal》2019,36(1):41-59

  相似文献