已为您找到该学者15条结果 成果回收站
【期刊论文】催化剂对煤着火特性影响规律的计算机辅助研究(Ⅰ)碱金属、碱土金属盐对煤的催化着火规律①
陈忠周, 武增华, 许玲, 胡鑫尧
计算机与应用化学,1996,13(4):270~273,-0001,():
-1年11月30日
应用计算机高速采集煤在燃烧过程中的各瞬时温度,通过特殊软件的数据处理,可以直接得到表征煤着火特性的着火温度,并应用该种计算机辅助研究方法,研究碱金属、碱土金属盐类对煤的催化着火影响。研究表明:碱金属、碱土金属盐的催化活性,随对应的金属的第一电离能的减弱而递增。但带结晶水的碱土金属盐例外,其催化活性,明显优于该属不带结晶水的的盐。
煤, 催化剂, 着火特性, 着火温度(, 着火点、燃点),
-
45浏览
-
0点赞
-
0收藏
-
0分享
-
43下载
-
0
-
引用
陈忠周, 李艳梅, 赵刚, 赵玉芬
有机化学,2001,21(4):273-277,-0001,():
-1年11月30日
系统地介绍和评述了近年来氨基、羧基、巯基和羟基等基团的酶催化脱保护方法的进展。由于酶催化脱保护方法具有反应条件温和(中性,水溶液)、选择性和专一性高、副反应少等优点,故在多肽缀合物、糖等敏感多官能团化合物的研究中有很广阔的应用前景。
酶催化, 脱保护, 氨基, 羧基, 羟基, 多肽缀合物
-
44浏览
-
0点赞
-
0收藏
-
0分享
-
103下载
-
0
-
引用
【期刊论文】The use of crude lipase in deprotection of C-terminal protecting groups
陈忠周, Zhong-Zhou Chen, Yan-Mei Li∗, Xi Peng, Fu-Rong Huang, Yu-Fen Zhao
Journal of Molecular Catalysis B: Enzymatic 18(2002)243-249,-0001,():
-1年11月30日
A crude lipase, Newlase F, was used to remove C-terminal protecting groups from dipeptide esters. Hydrolysis of dipeptide n-heptyl esters with Newlase F was conducted in aqueous media containing acetonitrile. The optimum pH and temperature of lipase in Newlase F were 7.0 and 30 ◦C, respectively. Low level acetonitrile promoted the hydrolysis of dipeptide n-heptyl esters, while high level acetonitrile inhibited the hydrolysis. However, the protease activity in Newlase F was significantly inhibited by acetonitrile. Lipase in Newlase F worked better in a medium containing water-miscible organic solvents than in water-immiscible ones. N-terminal protecting groups were not affected by the protease in the crude enzyme. It was found that the protease in Newlase F did not hydrolyze amide bond with hydrophilic amino acids on either side under these conditions (pH 7.0, room temperature). Newlase F may consequently be used widely in the synthesis of peptide conjugates. The crude enzyme was immobilized on SBA-15 mesoporous molecular sieve. The lipase activity of immobilized preparation was more active on hydrolysis of C-terminal protecting groups and stable than the free enzyme. The immobilization also reduced the protease activity.
Newlase F, Dipeptide heptyl esters, Lipase, Protease
-
43浏览
-
0点赞
-
0收藏
-
0分享
-
180下载
-
0
-
引用
【期刊论文】Structural Insights into Histone Demethylation by JMJD2 Family Members
陈忠周, Zhongzhou Chen, , Jianye Zang, Johnathan Whetstine, Xia Hong, Foteini Davrazou, Tatiana G. Kutateladze, Michael Simpson, Qilong Mao, Cheol-Ho Pan, Shaodong Dai, James Hagman, Kirk Hansen, Yang Shi, and Gongyi Zhang, *
,-0001,():
-1年11月30日
-
40浏览
-
0点赞
-
0收藏
-
0分享
-
158下载
-
0
-
引用
陈忠周, 赵刚, 李艳梅, 赵玉芬
有机化学,2001,21(1):8~15,-0001,():
-1年11月30日
O-磷酸酰化多肽及类似物对研究和阐明蛋白质可逆磷酸化对生命活动的调节机制具有极其重要的作用,本文总结了近年来发展起来的用现代化学方法合成O-磷酸酰化多肽及类似物的有效策略,如总体磷酸化法、磷酸化单体法等,并概述了常用的磷酸化方法及磷肽类似物的合成方法等。
O-磷酸酰化多肽, 磷酸化试剂, 固相合成, 化学酶法
-
40浏览
-
0点赞
-
0收藏
-
0分享
-
92下载
-
0
-
引用