Temperature Effect on the Life History of Three Types of Brachionus calyciflorus Females

The effect of temperature on the life history characteristics of amictic females ( AF), unfertilized mictic females (UMF) and fertilized mictic females (FMF) in Brachionus calyciflorus was studied with replicated individual cultures at 20℃ ,25℃ and 30℃ , and with algae Scenedesmus obliquus for their food. There were highly significant effects of both temperature and female type, independently and interactively, on the duration of juvenile and post-reproduction periods, and the number of eggs produced by the rotifer per life cvcle. Among all the temperature-female type combinations, all the juvenile periods of FMF, and the post-reproduction periods of UMF and FMF at 20℃, were the longest, and the number of eggs produced by an UMF at 30℃ was the highest. There were highly significant effects of both temperature and female type on the duration of the reproduction period, but no clear correlation was observed between temperature and female type. The reproduction period of AF was longer than that of UMF and FMF.Only temperature influenced significantly the mean life-span of the three types of females. The duration of juvenile,reproduction and post-reproduction periods as well as the life-span of the three types of females were all reduced very significantly with rise of temperature, but the rates of reduction varied with female type. Among the three types of females, the number of eggs produced per life cycle by an UMF was the highest, and that of a FMF was the lowest. A significant relationship between the number of eggs produced per life cycle and temperature was observed only in the UMF.     

大学生政治观教育内容的系统分析

政治观教育是思想政治教育的一项重要内容。研究大学生政治观的教育内容,构建并宣扬一种既符合主导政治观,又紧随时代脉搏跳动的政治理念、政治情感的内容体系,正是关系大学生政治素质的养成,国家人才强国战略的实施,社会主义政治文明提升的重大课题。在新的历史时期,大学生政治观教育内容主要包括六个方面,以国家观和民族观为主导,形成了一个有机的整体。     

浅析高校国有资产管理存在的问题及解决的措施

高校国有资产管理是学校管理工作的重要组成部分，加强高校国有资产管理已经成了国家有关部门和高校管理人员普遍关注的问题，文章从高校国有资产管理中存在的问题入手，剖析其成因并提出解决的措施。     

面向OBE培养理念的《数字摄影测量》课程改革

《数字摄影测量》课程需要学生不仅要掌握基本的理论知识,而且具有较强的实际动手能力。结合武汉大学遥感科学与技术专业的定位,针对国际工程专业认证的具体要求,探讨了《数字摄影测量》课程教学大纲的修订,并设计了一套以产出为导向的学生综合能力培养的考核模式,加强了对学生能力和素质的评价。提出的改革措施对相关专业的培养模式革新有一定的参考价值。     

Youth transitions and going to university: the perceptions of students attending a geography summer school access programme

This paper contributes to understandings of youth transitions in childhood and youth geographies through the use of a participatory diagramming exercise with students studying geography in a summer school access programme at a Scottish university. In particular, the paper explores young people's perceptions about adult/child binaries and their hopes and fears in applying to university. The discussion highlights the extended nature of youth transitions: the usefulness of participatory diagramming as a research method and teaching technique for this group; and the consequences that the increasing interest in childhood and youth geographies might have on teaching and learning in human geography.     

高校招生规模、政府投入和学费标准的三维动力学模型及政府调控

近年来，随着中国高等教育招生规模的急剧扩大，高等教育中出现了许多为社会所关注的热点问题，数学建模有助于解决有关的热点问题和引导政府进行宏观调控。作者在适当的假设下，系统地建立了关于高校招生规模、政府生均经费投入与学费标准之间的3个三维非线性微分方程动力学模型。给出每个模型平衡点的稳定性条件，并通过对模型进行极值分析，得到了政府确定高校的招生基数的原则和高校招生规模的估计。其主要结果为政府进行宏观调控决策提供了相应的理论依据。     

2006年广西气象培训班学员满意度调查与分析

根据2006年广西气象培训中心承办的14期气象培训班的学员满意度问卷调查数据,详细统计分析了学员对培训效果等11项调查内容的评价情况。结果表明,各培训班学员对培训效果表示满意或基本满意的比率在96%以上,远远高于目标考核要求的70%,培训效果比较好。学员对住宿及用餐等后勤保障工作的满意或基本满意率也高于70%,但有一定比例的学员对后勤保障工作不满意,并就如何改进气象培训工作提出了多项设想与建议。     

Observation of female gamete (Carpogonia) germination of Porphyra yezoensis and P. oligospermatangia

Several papers have reported that part or whole leafy thallus seemingly consisting of zygotospores can give rise to both blades and conchocelis in the same culture ofPorphyra. Study on samples of wild and cultivatedPorphyra yezoensis andP. oligospermatangia were conducted to clarify the origination of the young blades in the culture. It is confirmed that single cells on the blade of both species, which normally intermixed with zygotospores, germinated into young blades. TEM and SEM observation has shown that the single cells ofPorphyra yezoensis had typical features of female gamete (carpogonia) but archeospore. Therefore, the female gametes are responsible in developing leafy thalli. This project was sponsored by the NSFC (No. C-0205-05-39770593)     

大磷虾临产个体卵母细胞数量及组成特点研究

本文利用１９８９／１９９０至１９９２／１９９３年度南大洋考察于普里兹湾邻近海域所获大磷虾标本，分析了南极磷虾临产个体卵母细胞的数量及与体长、体重的关系，以及卵母细胞的组成和发育特点。结果表明：卵母细胞的数量（怀卵量）波动在２１８８－９２６３个之间，平均为５２８３个；连续４年的平均怀卵量没有显著差异；怀卵量与体重呈较好的正相关关系；与眼径及尾肢长度的相关关系较差；卵母细胞的组成可分为４个不同的发育期，各发育期数量的比例不尽然相同，似与卵巢发育程度和产卵时间有关。     

实践教学是地质教学的重要方法

实践是学生理解和掌握课堂知识的重要途径。对于吉林省工程技术学校这样以地质中等教育为主的学校来说,情况更是如此。为此,学校通过深入调查分析和研究,革新实践教学方式方法,精心安排实践教学内容,在传统实践教学的基础上大胆提倡体验式教学,力求为学生提供综合性、全方位的素质教育。