共查询到20条相似文献，搜索用时 750 毫秒
1.
蜘蛛染色体制片技术探索 总被引：1，自引：0，他引：1
周畅 《湖南教育学院学报》1998,16(2):80-84
本文以多种蜘蛛不同的组织器官为实验材料,通过设置不柢渗处理时间和采用多种固定的方法,旨在找到蜘蛛染色体制片技术的最优化方案。 相似文献
2.
雷氏大疣蛛（Macrothele raveni）是最近发现的异仿蛛科大疣蛛属的蜘蛛新种．雷氏大疣蛛毒素-V就是以该蜘蛛粗毒为原料，利用阴、阳离子交换层析和反相高效液相色谱分离纯化得到并命名的一种新型蜘蛛毒素．利用基质辅助激光解析电离飞行时间质谱仪分析得知它的相对分子质量为3133．48；通过初步活性研究证明雷氏大疣蛛毒素-V是一种昆虫专一性神经毒素． 相似文献
3.
对药用植物牛膝的染色体制备技术进行了初步研究与改进。以牛膝的根尖为试验材料,运用8-羟基喹啉,风油精和变温处理法进行前处理,结合去壁低渗-火焰干燥法中的低渗处理对牛膝染色体标本的制备方法进行了大胆探索。结果表明:采用8-羟基喹啉对牛膝进行前处理结合低渗处理可以获得良好的染色体图像。 相似文献
4.
雷氏大疣蛛(Macrothele raveni)是最近发现的异仿蛛科大疣蛛属的蜘蛛新种.雷氏大疣蛛毒素-V就是以该蜘蛛粗毒为原料,利用阴、阳离子交换层析和反相高效液相色谱分离纯化得到并命名的一种新型蜘蛛毒素.利用基质辅助激光解析电离飞行时间质谱仪分析得知它的相对分子质量为3133.48;通过初步活性研究证明雷氏大疣蛛毒素-V是一种昆虫专一性神经毒素. 相似文献
5.
王小利 《实验室研究与探索》2012,31(10)
利用具有优良抗逆性状基因的中国野生葡萄与品质好的栽培品种杂交培育优质、抗逆性强的综合性新品种,是解决现有品种存在抗性差问题的有效途径,而染色体鉴定是葡萄多倍体诱导和杂交育种的基础.分别以葡萄的幼芽、茎尖、幼叶、卷须和根尖为材料,利用去壁低渗-压片法和改良苯酚品红染色法探讨葡萄染色体鉴定最适合的材料和方法.结果显示,幼芽和根尖在有丝分裂中期的细胞数最多,最适合做染色体制片的材料,其次为卷须、茎尖和幼叶组织;综合取材难易、试剂及程序方法复杂的程度,去壁低渗-压片法适合取材比较容易的幼芽组织;改良苯酚品红染色法程序适合根尖细胞.为葡萄染色体鉴定提供了最有效的借鉴方法. 相似文献
6.
本文探讨了秋水仙素浓度、处理时间、低渗液浓度、固定次数及染色液等对小鼠骨髓细胞染色体制片效果的影响。根据直观分析得出了制作小鼠骨髓细胞染色体标本的最佳条件是:4.0g/L秋水仙素处理时间3小时,0.075M的KCl溶液低渗、两次固定、两次离心、改良石碳酸品红染液染色,可得到大量图像清晰、长度适中、分散良好的中期细胞分裂相。 相似文献
7.
丛建国 《潍坊教育学院学报》1997,(4)
作者自1989年～1995年,历时7年对青州市郊的苹果园、桃园、山楂园蜘蛛群落采用无返回取样法进行系统调查.结果表明:果园蜘蛛群落的组成计19科、76种,其中以狼蛛科、蟹蛛科、管巢蛛科及跳蛛科的数量占优势.由于人为等因素的干扰,群落季节消长不显,其垂直分布以下部蛛量为多,三种果园蜘蛛群落多样性分布值为苹果园>桃园>山楂园. 相似文献
8.
9.
通过对沙打旺种植地的调查，发现有11科25属37种蜘蛛．7月上、中旬出现的优势种为印痕球蛛（Theridion impressum），7月下旬出现的有条纹花蟹蛛（Xysticus striatipes）和黑侏儒蛛（Meioneta nigra），8月下旬偶见有田野豹蛛（Pardosa agrestis），但在4块样地内，自8月初到9月初，优势种基本上为条纹花蟹蛛．分析了蜘蛛生物学特性、植被情况、土壤情况和人事活动对蜘蛛群落结构和优势种群消长变化的影响，分析的结果可为草地害虫的综合防治提供参考． 相似文献
10.
11.
应用酶解去壁法制备蝴蝶兰染色体标本,对供试材料的选取、预处理方法、酶解时间和温度加以探索．实验结果显示,换盆后14～20d的盆苗嫩根根尖分裂活性最高、中期分裂相较多．剪取长1cm左右的根尖用O．002M的8-羟基喹啉在18℃预处理4h,卡诺固定液固定2～24h,再用4％纤维素酶和1％果胶酶的混合酶液在25℃下酶解1．5h,能获得高质量的制片,染色体在载玻片上分散良好、形态清晰． 相似文献
12.
郭团玉 《宁德师专学报(自然科学版)》2012,24(1):62-64
结合多年生物实验教学实践,对植物的细胞染色体标本制备的实验取材、操作步骤、药品试剂等实验方法进行改进,增进学生对实验原理的理解、简化实验过程、节约实验经费,提高实验效果. 相似文献
13.
Abstract As early childhood teacher educators, we are thoroughly immersed in conversations about developmentally appropriate practice. Whether teachers should incorporate the use of food as learning materials is a case in point. As with many other concerns we ponder in our field, our task must be to define, clarify, and consider multiple perspectives in the pursuit of a rational justification of our position. In this paper we report the results of our careful review of theory and research that leads us to propose that using food as art material violates principles of best practice for three main reasons, because it: (1) teaches young children that it is acceptable to eat play materials and to play with food, (2) teaches young children that it is acceptable practice to waste limited resources, (3) violates many premises of multicultural education, or teaching children about diverse ethnic groups. 相似文献
14.
徐元康 《韩山师范学院学报》1998,19(2):112-115
家蚕染色体的研究是家蚕细胞生物学及细胞遗传学的基础工作,由于其染色体的特殊性,过去研究进展较为缓慢。但近年来,取得一定进展,本文就研究家蚕染色体的材料和染色体显带方面的进展进行概述。 相似文献
15.
以豌豆根尖细胞为材料,用5种品牌的废旧干电池的混合液配制成体积比为5%、10%、15%、20%、25%、30%(V废旧电池液/V蒸馏水)和原液为诱变剂染色体压片技术,测定豌豆根尖细胞的微核率,染色体畸变率和有丝分裂指数等指标.结果表明:不同体积比的废旧电池液均能诱发豌豆根尖细胞较高的微核和染色体畸变,在5%-25%体积比内,微核率随电池液体积比的增加而升高,当体积比大于25%后,微核率逐渐下降;不同体积比的电池液均能降低根尖细胞有丝分裂指数.废旧电池液对豌豆根尖细胞有较强的遗传毒性. 相似文献
16.
17.
Although peer-based work is encouraged by theories in developmental psychology and although classroom interventions suggest
it is effective, there are grounds for recognising that young pupils find collaborative learning hard to sustain. Discontinuities
in collaborative skill during development have been suggested as one interpretation. Theory and research have neglected situational
continuities that the teacher may provide in management of formal and informal collaborations. This experimental study, with
the collaboration of the science faculty in one urban secondary college, investigated the effect of two role attribution strategies
on communication in peer groups of different gender composition in three parallel Year 8 science classes. The group were set
a problem that required them to design an experiment to compare the thermal insulating properties of two different materials.
This presents the data collected and key findings, and reviews the findings from previous parallel studies that have employed
the same research design in different school settings. The results confirm the effectiveness of social role attribution strategies
in teacher management of communication in peer-based work. 相似文献
18.
Picturing global educational inclusion? Looking and thinking across students’ photographs from the UK,Zambia and Indonesia 总被引：1，自引：0，他引：1
Ian Kaplan Ingrid Lewis Paul Mumba 《Journal of Research in Special Educational Needs》2007,7(1):23-35
Over the last few years we have engaged children and young people in participatory photography projects in a diverse range of international contexts. The projects, diverse as they are, have been school-based and primarily focused on students' experiences of educational inclusion/exclusion. Photographs taken by students can stimulate conversations in which different perspectives are shared and considered. Whilst this process is meaningful within a local context, it is also compelling to reflect more widely on what children and young people's photographs and commentary (and through these their interpretations of their educational experiences) have to tell and, indeed, show us about educational inclusion globally. In this paper, we begin by explaining what we mean by the term 'educational inclusion', and consider what methodological relevance the participatory photography has for engaging in research with children and young people about their educational experiences. We then briefly describe the contexts of the projects this paper draws on, which took place in the UK, Zambia and Indonesia. In the main body of the paper, we will look across these international projects and consider a selection of students' photographs and interpretations in relation to several broad themes about educational inclusion which they suggest. 相似文献
19.
Hani Morgan 《Early Childhood Education Journal》2009,37(3):219-227
In today’s global age, it is important for young students to develop multiple perspectives. Some of the standards that today’s
teachers are required to adhere to include an understanding of different cultures. The National Council for the Social Studies,
for example, indicates that teachers should provide instruction that complies with various thematic standards which include
teaching about global connections and cultural diversity. To encourage young students to develop multiple perspectives, teachers
need to pay attention not only to how they teach, but also to what they teach. Educators can guide students to develop cross-cultural
understanding at an early age by using well-written picture book biographies which represent people from diverse backgrounds.
This article explains what multiple perspectives are and offers resources and strategies for educators that will help young
students develop an understanding of the frames of reference that different groups of people hold. It also emphasizes the
importance of developing multiple viewpoints at a young age. 相似文献
20.
自然美包括日月星云、山水花鸟、草木鱼虫、园林四野等等,非常广阔多样.自然美作为经验现象,是人们经常能够欣赏和感受的.在室内设计中,设计师根据不同的情况运用不同的自然元素--材料来营造不同的空间气氛.室内环境中各种自然的符号表达以及空间造型的各种信息,也通过材料传达给我们,使设计师的抽象理念超越物质本身而转化为一种具体可视的现实,人们可以与此进行交流.室内设计如同工业产品设计一样,要想获得成功,必须有它与众不同的表现形式,而这种形式都是以"材料"为载体通过设计来完成的.而有关建筑与自然空间的和谐以及关于室内与室外衔接,室内的功能空间的材料构成也必须围绕自然一点的风格而给予合理的分配和规划. 相似文献