Results 51 to 60 of about 311,732 (116)
, 1966 <正> 关于云南省的枝角类,迄今只有陆鼎恒(1939)、张玺与易伯鲁(1945)分别就该省中部的洱海和滇池所产者作过专文报导。此外,萧之的(1949)、黎尚豪等(1963)曾在中部的高原地带进行了湖泊调查,并记述了部分种类。至于该省南部热带地区的枝角类 ...
沈嘉瑞,戴爱云,蒋燮治
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, 2000 采用氧化铝层析从云南红豆杉植物浸膏中转化生成和分离提纯了紫杉醇。考察了氧化铝的类型、流动相中水和甲醇的添加、反应时间以及洗脱速度和洗脱剂组成等层析操作条件对紫杉醇回收和分离的影响。研究表明 ,采用碱性氧化铝柱层析分离和回收紫杉醇效果显著 ,通过对紫杉醇转化和分离条件的优化 ,经一步氧化铝柱层析 ,可以使紫杉醇的含量从小于 1.0 %提高到大于 2 7% ,紫杉醇的回收率大于 170 %
张志强, 苏志国
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[Visual analysis of the current research status and hotspots of electric burns at home and abroad]. [PDF]
Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi, 2023 Chen HX +7 more
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, 2013 [[abstract]]Lanuage learning strategy training has been widely discussed and recommended. However, in Taiwan, only very few studies have been concerned with English learning strategy training. It is widely believed that a successful activity design would
黃聖慧
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[Rapid determination of aesculin and aesculetin in Fraxini Cortex by high performance liquid chromatography-ultraviolet at equal absorption wavelength]. [PDF]
Se Pu, 2023 Qian ZM +5 more
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, 2017 该文描述了紫堇科二新种:(1)自云南省发现的紫堇科紫堇属一新种,宽鳞紫堇。此新种与波密紫堇相近似,与后者的区别在于本新种的根状茎鳞片半透明,具三条脉,茎无叶,外花瓣无鸡冠状突起,雄蕊束具2花药,花丝条形,无脉,子房宽条形。(2)自黑龙江省发现的紫堇科紫堇属一新种,鹤岗延胡索。此种与新疆元胡相似,但本种叶的小叶多在顶端,具1~5牙齿,花序苞片有3~5小裂片,上花瓣及其瓣片和距均较小,蜜腺呈狭卵球形,弯曲 ...
王文采
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, 2013 [[abstract]]With the published guidelines of Ministry of Education on Grade 1-9 Integrated English Curriculum focusing on the training of oral skills, the challenge that English teachers most likely have to encounter is that elementary school students ...
莊琍玲; 許瓊文
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, 2008 设计并研制了一套集成紫外吸收检测微流控芯片系统，该系统由一台紫外吸收检测微流控芯片仪、两种不同类型紫外吸收检测适用微流控芯片和相关分析试剂盒组成，并利用该系统开展了一系列初步应用研究。 构建了一台集成紫外吸收检测微流控芯片分析仪，考察了该仪器的检测限和重现性等基本性能，和北京彩陆公司合作，实现了该仪器的商品化。 针对紫外吸收检测的特殊性，发展了两类专用微流控芯片。建立了一种多点加压的石英芯片常温封接方法，大大降低了石英芯片封接难度，提高了封接成功率；建立了一种超薄检测窗PDMS-石英杂交芯片的刻蚀方法 ...
马波
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Research progress on vesicles from Chinese medicinal herbs. [PDF]
Zhejiang Da Xue Xue Bao Yi Xue Ban, 2023 Li J, Wang W, Zhang Y, Yang Z.
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