新型表面活性剂3-十二烷氧基-2-甲基丙酸钠的合成     

农兰平  刘杰凤  周统武 《茂名学院学报》2002,12(4):32-34

通过增加皂类表面活性剂分子中亲水基的总数，可以提高其抗硬水性能，为此，在亲油基与羧基之间引入烷氧基，该研究以甲基丙烯酸和十二醇的主要原料，采用加成，酯化，取代，皂化四步法合成3-十二烷基-2-甲基丙酸纳，其中，杂多酸对酯化反应起到了催化和阻聚双重作用；相转移催化剂用于取代反应，简化了操作，缩短了反应时间，提高了产率。  相似文献   

正确认识和对待私营企业主入党的问题     

兰迎春  张仁厚 《沙洋师范高等专科学校学报》2002,3(3):29-32

私营企业主能否入党是一个众说纷纭的敏感问题。我们认为有中国特色社会主义事业的建设的定性决定了优秀的私营企业主可以入党；发展优秀的私营主入党是扩大党的群众基础的需要。在发展优秀的私营企业主入党问题上，应该把握好发展党员的方针政策、原则和程序以及对优秀私营企业主的考察培养。  相似文献   

Tandem Biocatalysis by CotA-TJ102@UIO-66-NH2 and Novozym 435 for Highly Selective Transformation of HMF into FDCA     

Chang  Xin  Zhang  Chengyu  Gao  Lan  Liu  Xiao  You  Shengping  Qi  Wei  Wang  Kang  Guo  Xin  Su  Rongxin  Lu  Han  He  Zhimin 《天津大学学报(英文版)》2019,25(5):488-496

2,5-Furandicarboxylic acid(FDCA) is a potential biorenewable chemical for applications including plastics, polyamides, drugs, etc. The selective biosynthesis of FDCA from 5-hydroxymethylfurfural(HMF) by a specific enzyme poses a great challenge. In this study, we reported an efficient strategy to produce FDCA from HMF by the tandem biocatalysis of laccase(Cot A-TJ102@UIO-66-NH_2) and Novozym 435. For the first step, a nanoparticle metal–organic framework was synthesized as a carrier to immobilize Cot A-TJ102@UIO-66-NH_2, which was assigned for the production of 5-formyl-2-furancarboxylic acid(FFCA) and featured an enzyme loading of 255.54 mg/g, specific activity of 135.90 U/mg, and solid loading ratio of 99.65%. Under optimal conditions, an ideal FFCA yield of 98.5% was achieved, and the Cot A-TJ102@UIO-66-NH_2 presented a high recycling capacity after 10 cycles. For the second step, Novozym 435 was applied for the further conversion of FFCA into FDCA, presenting a high FDCA yield of 95.5% under the optimized conditions. Novozym 435 also exhibited a high recyclability after eight cycles. As a result, the tandem biocatalysis strategy provided a 94.2% FDCA yield from HMF, indicating its excellence as a method for FDCA production.  相似文献   

用Authorware构建多媒体软件框架的三种方法     

吴兰 《连云港师范高等专科学校学报》2004,(3):89-91

文章介绍了在Authorware多媒体软件中实用性很好的组建整体结构的三种方法：常见交互图标应用法、导航图标应用法、文字超级链接法。将课件中的多种信息模块化地组织在一起，为课件制作者带来很大的方便性和灵活性，且在媒体软件制作方面有着广泛的应用。  相似文献   

Investigation of iodine concentration in salt,water and soil along the coast of Zhejiang,China     

陆颖理  王宁荐  朱岚  王国兴  吴晖  匡琳  朱文明 《Journal of Zhejiang University. Science. B》2005,6(12):1200-1205

Objective: We aim to describe the environment iodine concentration in salt, water and soil along Zhejiang Province coast in the China foreland. It will be helpful for us to judge whether this area is insufficient in iodine and universal iodized salt is necessary or not. Methods: We collected iodized salt samples, drinking water samples (tap water in the towns, and well water or spring water in the villages), water samples from different sources (ditches, lakes, rivers) and soil samples through random sampling in June, 2005. Salt, water and soil iodine was detected by arsenic-cerium redox method. Statistical analysis was expressed as mean±SEMby Windows SPSS 13.0. Results: (1) The iodine concentration in salt was 27.9±4.33 mg/kg (n=108). (2) Seventy-five water samples were collected. The water iodine value was 0.6～84.8 μg/L (mean of 11.66 μg/L). The watershed along the Qiantang River has significantly higher iodine content than the water in Lin'an in mountain area (P＜0.01). The iodine content and mean iodine content of tap water, well or spring water and natural water sources were 4.30±2.43 μg/L (n=34), 23.59±27.74 μg/L (n=19)and 12.72±10.72 μg/L (n=22) respectively. This indicated that among environmental water sources, the ditch iodine content was the highest with river water iodine being the lowest (P＜0.01). (3) Soil iodine value was 0.11～2.93 mg/kg (mean of 1.32 mg/kg).Though there was no statistical difference of soil iodine in different districts (P=0.131), soil iodine content correlated positively with water iodine content. Conclusion: Iodine concentration in salt accords with national policy of adding iodine in salt. Foreland has more iodine in water than mountain area. The data reflected that water and soil iodine in foreland area was not high, which suggests universal iodized salt should be necessary. Environment iodine has relatively close association with pollution.  相似文献   

对现代化教学技术在音乐教学中唯上的批判——兼论教师在音乐教学中的核心作用     

邓兰 《教育学报》2006,2(3):51-54

在目前的音乐教育课程改革过程中,存在着对现代化教学技术手段的运用“唯上”的误区,如何走出这一误区?广大音乐教师应该有如下的意识:现代化教育技术的运用并不是一节有效音乐课实施的关键所在,音乐教育也不是只有运用了现代化教育技术才能有所作为,而新课程改革的重点更不是落在对现代化教育技术手段的运用上,音乐教师的教学艺术才是成就一堂高质量音乐课的关键因素。  相似文献   

论科学发展观对宪法及宪法学的影响     

吴岚  吴疆 《赣南师范学院学报》2011,32(1):122-124

科学发展观作为中国特色社会主义理论体系的重要组成部分,所要解决的重大问题是中国的发展模式和发展目的问题。法律作为社会发展模式的一个组成部分,在法治化水平不高或法治模式正在建构的中国,应当顺应发展模式和发展目的的选择,这也为处于转型社会中的中国宪法的发展提供了新的契机。科学发展观具有宪法指导思想价值、宪法性方法论价值、保障基本人权价值。科学发展观将对中国宪法观念变革、宪法内容变化和宪政体制机制完善发生重要影响,将对宪法理论和宪法学体系产生重要影响。  相似文献   

“双向互动式”英语口语培养模式及绩效研究     

于兰 《辽宁高职学报》2011,13(2):21-23

针对目前英语口语教学在高职教育中的重要性,辽宁工程技术大学经济管理学院提出了＂双向互动式＂英语口语教学模式及其相应的评估体系。该模式是以口语技能训练为导向,以学生参与为中心,采用了师生互动的教学模式。通过对该模式的绩效研究,证明了该模式与传统的英语口语教学模式相比有着极大的优势。  相似文献   

网络三维虚拟实验系统的设计与实现   总被引：1，自引：1，他引：0  

孙江山  余兰 《现代教育技术》2011,21(7):114-117

根据虚拟现实技术特性,结合代表性的案例,分析网络三维虚拟实验系统的基本构成框架。依据虚拟实验系统的开发流程,以化学虚拟实验《实验室制取气体》的开发为例,介绍了基于Virtools开发网络三维虚拟实验系统的方法和过程。最后,对网络三维虚拟实验系统的开发应用进行了总结与展望。  相似文献   

略论民主革命时期毛泽东反腐倡廉的思想及其意义     

徐兰 《阜阳师范学院学报(社会科学版)》2001,(5):64-67

民主革命时期毛泽东反腐倡廉的思想主要包括:关于反腐倡廉的重要性、关于反腐倡廉的主要内容等,论述了毛泽东反腐倡廉思想的历史意义和对现实的启迪意义。  相似文献