陆英中乌索酸的分离与鉴定(Ⅰ)

目的：分离和鉴定陆英中抗肝炎主要成分乌索酸．方法：采用“醉提凝析法”提取乌索酸．结果：产品经理化常数和光谱学鉴定，确征为乌索酸，其提取率达90．2％，纯度达99．72％．结论：本工艺技术具有先进合理、实用可行、有利于工业化生产的特点．     

连续型随机变量函数的密度函数的计算公式

研究一维连续型随机变量ζ的函数η=|ξ|和η=ξ^2的分布以及二维连续型随机变量(ξ，η)的函数ζ=aξ bη的分布，从而得到η=|ξ|，η=ξ^2及ζ=aξ bη的密度函数的计算公式。     

直接快速法提取胆红素

胆红素是分析化学和生化研究的重要试剂,是国内外紧缺的医药原料。本文概述了提取胆红素的原理,主要介绍了直接快速法提取胆红素的方法和工艺流程,该方法具有原料来源广泛、操作方便、快速稳定、产率高、质量好等优点,非常适宜乡镇企业生产。     

一个重要的不等式的证法

概率论是数学的一个重要分支,不等式的证法是多种多样的。文章借助概率空间中对应的形式来证明数学中一类常用的不等式,用以显示概率论思想在解决某些数学问题时所具有的独特功能,同时也揭示概率论与其他数学分支之间的关系。     

Paired values of serum fructosamine and blood glucose for the screening of gestational diabetes mellitus: A retrospective study of 165 Saudi pregnant women

This study reports the utilization of serum fructosamine and blood glucose for the screening of gestational diabetes mellitus (GDM). Blood samples from 165 pregnant women were analyzed for fasting blood glucose (FBG), random blood glucose (RBG) and serum fructosamine. The actual fructosamine levels were corrected for serum protein (c-Fruct) for more precise presentation. Two cut-off values of FBG (>5.3 mmol/L and >7.0 mmol/L) and RBG (>7.8 mmol/L and >11.0 mmol/L) were used to classify hyperglycemic subjects for subsequent evaluation. The average values±standard deviations for FBG, RBG and cFruct were 5.865±1.95, 7.767±3.21 and 2.387±0.47 mmol/L, respectively. FBG levels were significantly correlated with RBG (Pearson correlation=0.597, P<0.001). Significant correlations were also observed between cFruct and FBG (Pearson correlation=0.673, P<0.001) or RBG (Pearson correlation=0.641, P<0.001). Out of 165 subjects, 24 (14.5%) cases were classified as hyperglycemic on the basis of FBG>7.0 mmol/L or RBG>11.0 mmol/L; use of lower cut-off values resulted higher frequencies of hyperglycemia. Whereas, a combined criteria of FBG>5.3 mmol/L and cFruct >2.5 mmol/L predicted 35 patients as the most probable hyperglycemic as compared to 32 patients identified using the criteria of RBG >7.8 mmol/L and cFruct >2.5 mmol/L. These criteria were associated with 4.8% and 3.6% false-positivity at the expense of 3.6% and 3.0% false-negative outcomes, respectively. The levels of FBG, RBG and cFruct were significantly higher in hyperglycemic groups (irrespective of grouping criteria) as compared to the respective normal groups. In conclusion, these findings clearly indicate that the paired values of cFruct with FBG or RBG could help in filtering high-risk individuals for OGTT and therefore avoiding a unnecessary OGTT.     

针禾属植物羽毛针禾基因组DNA提取方法的研究

传统的CTAB DNA提取法步骤多.较烦琐,DNA产率低,而且由于酚、单宁、色素、多糖很难完全去除,容易影响随机扩增多态、微卫星等标记工作的效率.采用SDS裂解法提取了针禾属植物幼嫩叶片的基因组DNA,所获得的DNA可用于PCR反应.并且在针禾属植物的研究中得到了较好的结果.     

徐铉家世考

徐铉是五代宋初一位著名的文学家和学者。目前对于徐铉的生平事迹的梳理已经取得了一定的成果,但对他的家世的研究还较薄弱。徐铉的郡望、祖籍和出生地是三个不同的地方,有关他的父母、妻子和其他亲人的情况,均有一些史料可以补现有研究的不足。     

中药巴戟天中蒽醌的提取与测定

选用适当的提取和水解方法,利用蒽醌与醋酸镁的显色反应,以1,8-二羟基蒽醌为对照品,采用分光光度法分别对中药巴戟天中游离和结合蒽醌衍生物的含量进行了测定。实验证明巴戟天中蒽醌含量较高,且结合蒽醌含量远大于游离蒽醌含量,精密度良好,回收率较高,为正确评价其药效,合理开发该药提供了参考依据。     

迭代逼近Banach空间中强伪压缩映象的不动点

引入和研究了Banach空间中强伪压缩映象的不动点的具随机混合型误差的Ishikawa和Mann迭代序列的逼近问题,统一、改进和推广了有关文献中的相应结果。