关于C-积分的一个注记

本文研究了高维空间中C-积分的有关性质.利用被积函数的可测性质,证明了若函数在I0上C-可积,则存在I0上的一个部分,使得函数在该部分上Lebesgue可积.推广了文献[6]中的结论.     

Cytotoxic Acridone Alkaloids from the Stem Bark of Citrus Maxima

A new acridone alkaloid, 5‐hydroxynoracronycine alcohol (4), along with six known acridone alkaloids, glycocitrine‐I (1), 5‐hydroxynoracronycine (2), citrusinine‐I (3), grandisine‐I (5), natsucitrine‐II (6), and citracridone‐III (7), were isolated from the stem bark of Citrus maxima f. buntan. Their structures were established on the basis of spectroscopic methods. Compounds 1‐4 and 7 were found to be cytotoxic on two tumor cell lines.     

双份饭法评估广州某高校学生膳食硼摄入情况

为研究用改良姜黄素分光光度法测定双份饭食物中硼含量,以评估高校学生膳食硼摄入情况,用双份饭法收集10名学生3d的食物样品,记录饮水量;食物样品在用饱和Ca(OH)2调至碱性后灰化,然后在酸性条件下硼转化为硼酸,与姜黄素反应生成红色络合物,比色定量;饮用水中硼采用国标姜黄素分光光度法测定.然后计算出调查对象硼摄入量.结果...     

红外线吸收光谱在油份分析系统中的应用

本文针对红外线吸收光谱在油份分析的应用，研制了一种红外油价分析系统。     

On the reactivity of ascomycin at the binding domain. Part 1: Liberation of the tricarbonyl portion of ascomycin

Within the binding domain, ascomycin features the unusual pattern of a masked tricarbonyl moiety, which potentially allows for high structural diversity via simple isomerisation events. Herein, methodologies, allowing the liberation of the tricarbonyl unit by blocking the 14-hydroxy group are reported.