期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
一种利用扫描电镜观察植物样本表面结构的实用方法
1
作者 张光祥 《四川师范大学学报(自然科学版)》 CAS CSCD 1997年第2期115-118,共4页
本文以诱导体细胞胚胎发生的虎眼万年青鳞片外植体为材料,介绍了一种利用扫描电镜观察植物样本表面结构的实用方法.其技术要点是利用碘化钾和醋酸双氧铀作双重导电染色取代喷金以节省实验费用,用高锰酸钾取代锇酸对植物材料进行后固... 本文以诱导体细胞胚胎发生的虎眼万年青鳞片外植体为材料,介绍了一种利用扫描电镜观察植物样本表面结构的实用方法.其技术要点是利用碘化钾和醋酸双氧铀作双重导电染色取代喷金以节省实验费用,用高锰酸钾取代锇酸对植物材料进行后固定以增强反差并延长耐受观察的时间.实验结果显示,使用该方法可以取得良好的扫描电镜观察效果.对于使用高锰酸钾固定液容易引发的材料碎裂和受杂质污染等问题。 展开更多
关键词 扫描电镜观察法 高锰酸钾 植物样本 表面结构
下载PDF
银杏雄株花粉特征观察与分类研究 被引量:2
2
作者 李卫星 于建友 陈鹏 《扬州大学学报(农业与生命科学版)》 CAS CSCD 北大核心 2010年第2期59-63,共5页
连续2年采集分布在江苏省的89株银杏雄株的花序,通过光学显微镜、扫描电镜和透射电镜观察银杏雄株花粉,探讨银杏雄株种质资源的分类情况。结果表明:①银杏雄株花粉表面纹饰主要表现为4种类型,即球珠镶嵌型、贝甲镶嵌型、线纹镶嵌型和弧... 连续2年采集分布在江苏省的89株银杏雄株的花序,通过光学显微镜、扫描电镜和透射电镜观察银杏雄株花粉,探讨银杏雄株种质资源的分类情况。结果表明:①银杏雄株花粉表面纹饰主要表现为4种类型,即球珠镶嵌型、贝甲镶嵌型、线纹镶嵌型和弧纹镶嵌型。②银杏雄株花粉壁厚度为0.861~1.076μm,外壁厚度是内壁的2~6倍。③经对花粉形状指数进行三元变量系统聚类分析,供试雄株可分为4种类型,与花粉形状指数的分类数相同,Ⅰ类4株,Ⅱ类34株,Ⅲ类47株,Ⅳ类4株,证明雄株间花粉表面纹饰和壁厚度性状指标存在显著或极显著差异。 展开更多
关键词 银杏 雄株花粉 扫描电镜观察法 透射电镜 聚类分析
下载PDF
Preparation and Characterization of High Purity Enriched 10B Boric Acid via Anti-Solvent Recrystallization 被引量:2
3
作者 张卫江 刘天雨 徐姣 《Transactions of Tianjin University》 EI CAS 2016年第3期279-283,共5页
Self-made enriched IUB boric acid as raw material was purified by recrystallization. The effects of final crystallization temperature, crystallization time, stirring speed, crystallization frequency and other factors ... Self-made enriched IUB boric acid as raw material was purified by recrystallization. The effects of final crystallization temperature, crystallization time, stirring speed, crystallization frequency and other factors on the purity were investigated. The appropriate operating condition was that the final crystallization temperature and time were 5 ℃ and 10 h respectively under a low-speed stirring for crystallizing twice, which would make the purity and yield of boric acid reach 99.94% and 95.36%, respectively. Taking this as foundation, recrystallization process was optimized with acetone as anti-solvent, whose amount was the most important index. The boric acid solution was added into acetone and recrystallized under the same condition, and the purity and yield of boric acid would reach 99.98% and 99.61%, respectively. The product detected by XRD was confirmed as boric acid crystal. Main ion concentration in the product was detected by ICP, which basically met the national standard of high purity. Crystal morphology of boric acid was observed by SEM. 展开更多
关键词 anti-solvent recrystallization boric acid PURIFICATION CHARACTERIZATION
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部