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Cheng Zhi Yong Li Yan Yue Zhi Zhou Yang Gui ShuTo whom correspondence should be addressed. Jiang Yao Zhong 《合成化学》1997,(2)
用一锅法制得了2-三溴甲基-3-甲酰基-5-氧-4-口恶唑烷乙酸,它与氨基酸酯反应形成题称化合物N-甲酰基-α-天冬氨酰肽类。 相似文献
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建立同时测定藏药湿生扁蕾中獐牙菜苦苷、獐牙菜苷、异荭草苷、1,7-二羟基-3,8-二甲氧基口山酮含量测定方法.RP-HPLC法,使用VP-ODS C18柱(5μm,150 mm×4.6 mm),流动相为乙腈-0.4%磷酸水溶液,梯度洗脱[0~40.00min乙腈的体积分数(以下同)由10%线性递增至30%;40.01~55.00 min由30%线性递增至100%],流速为1.0 mL/min,柱温30℃,检测波长260 nm.结果:獐牙菜苦苷、獐牙菜苷、异荭草苷、1,7-二羟基-3,8-二甲氧基口山酮的线性范围为2.80~14.0 μg(r=0.9992),4.12~20.6μg(r=0.9997),0.34~1.68μg(r=0.9997),2.64~13.2 μg(r=0.9994);回收率分别为99.89%,99.52%,101.88%,99.42%.该方法可用于控制湿生扁蕾的质量. 相似文献
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新疆保险公司营业大楼大体积筏板基础冬期施工 总被引:1,自引:0,他引:1
1996年,商品混凝土在乌鲁木齐还未得到广泛推广应用的情况下,不留施工缝,一次浇筑长65m,宽25m,厚1.6m,防渗等级S8这样大体积筏板基础混凝土,确有一定难度.为此,本文采取了有条件时优先选用商品混凝土,无条件或商品混凝土供应中断时现场搅拌进行浇筑的方法解决了这一难题. 相似文献
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YongChunYANG ShengYangHUANG ShunYanMO ChunYANG JianGongSHI 《中国化学快报》2003,14(7):717-719
A new furost-20(22)-ene oligoglycoside named as aspacochioside C was isolated from the roots of Asparagus cochinchinensis (Lour.) Merr. Its structure was elucidated to be 26-O-β-D-glucopyranosyl-(25S)-5β- furost-20(22)-en-3β,26-diol-3-O-α-L-rhamnopyranosyl-( 1 →4)-β-D-glucopyranoside on the basis of spectroscopic techniques including 1D and 2D NMR experiments. 相似文献
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ⅠNTRODUC(?)NIn a recent paper the author has published the result, ofsome,investigations on the periodic sequences of Laplace of periodfour with a stratifiable couple of diagonal congruences.Thedeterinination of these soquences of Laplace requires the integrationof the classical partial differential equation 相似文献
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Gu Ping TANG Xiao Xiao SONG Da LI 《中国化学快报》2006,17(2):191-194
Collagen is the most widely used tissue-derived natural polymer for its goodbiocompatibility and cell adhesion but offers a limited range of mechanical properties1.The construction and properties of synthesized polypeptides are similar to collagen havethe… 相似文献