生物工程专业本科毕业论文选题调查分析

以淮北师范大学生命科学学院为例,通过对生物工程专业近3年毕业生的225篇毕业论丈选题的调查分析,发现生物工程专业毕业论文在选题方面存在诸多问题,如选题领域不均、选题大小和深度不当、题目过长、指导教师资源不足等。同时从学生角度浅析了制约论丈质量提高的因素：学生思想上重视不够;自身精力投入不足;论丈写作基础薄弱。针对存在的问题,简要分析了问题产生的原因,并提出了对策建议。     

近年来图书馆学基础理论研究若干热点问题略述

主要对近年来图书馆学基础理论研究的几个热点问题：图书馆读者权利、图书馆职业精神和图书馆发展趋势进行了概述。     

兽医学博士课程《实验技术专题》教学初探

博士研究生是科学研究和创新工程的重要生力军,而实验技术水平是决定其科研创新能力的一个关键因素。本文以扬州大学兽医学院为例,从教学大纲的编写、授课形式及考核方式等方面,对兽医学博士研究生新增课程“实验技术专题”的教学进行了初步探索,以期进一步提高博士研究生的培养质量,为其今后从事科研创新工作奠定坚实基础。     

基于SSCI数据库的环境经济学学术研究趋势分析

第1次使用文献计量学的方法分析了SSCI数据库1993-2008年与环境经济学相关的数据记录,分析的内容包括作者关键词（Author keywords）、附加关键词（Keywords plus）、学科分类（Subject category）、国家（Author address,Reprint address）、文章类型（Documenttype）、出版语言（Language）、研究机构（Author address,Reprint address）。结果表明,自20世纪90年代以来,环境经济学领域的研究成果呈现指数增长趋势,主要研究成果来自美国。针对＂中国＂、＂气候变化＂、＂环境库茨尼兹曲线＂、＂贫穷＂的研究显著增长,以＂政策的作用＂、＂环境管理绩效＂、＂健康＂、＂污染排放的环境影响＂等为主题的研究会成为今后的研究热点。     

Pectin‐based pellets for crayfish aquaculture: structural and functional characteristics and effects on redclaw Cherax quadricarinatus performances

Pectin is a promising candidate to be employed as binder for manufacturing pellets for crayfish feeding. In this study, the gelling properties of different types of pectin and their effects on Cherax quadricarinatus performances have been analysed. Pectins with different degree of esterification from apple and citrus were screened to select those with the best gelling properties to be employed in pellet manufacturing. Three pectins were selected: low esterification degree apple pectin (LEAP), low esterification citrus pectin (LECP) and high esterification degree apple pectin (HEAP). Scanning electron microscopy analysis, nutrient leaching and water uptake indicated that LEAP showed the best aggregating properties, followed by LECP and HEAP pellets. Cherax quadricarinatus performances were affected by the pectin type, with redclaw fed LEAP pellets showing the highest (P < 0.05) growth rate and amylase activity (P < 0.05) in the gastrointestinal tract. Altogether these results indicate that LEAP can be considered an excellent binder for feed pellets due to its gelling properties and its efficacy to improve growth and stimulation of digestive enzyme activity.