南海短足软珊瑚Cladiella sp.的化学成分

神经酰胺;烷醇孕甾酮;南海短足软珊瑚Cladiella sp.的化学成分     

On the single-electron local kinetic energy

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L~∞ -ERROR ESTIMATE OF NONCONFORMING ADINI''''SPLATE ELEMENT

In this paper the asymptotic optimal L -error estimate of the nonconforming Adini's rectangular plate element is obtained for the fourth-order linear elliptic boundary value problem. The proof is based on the method for regularized Green's functions and the lechnigue of the auxiliary element."     

多酶复合水解微波加热制备小分子大豆肽

以水解度和AN为指标,确定了微波加热条件下,三种单酶(碱性蛋白酶、中性蛋白酶、酸性蛋白酶)水解大豆蛋白的最佳工艺条件及三种酶复合水解的加酶顺序,将大豆蛋白最大限度的分解为小分子大豆多肽和氨基酸。毛细管电泳实验表明:多酶复合水解优于单酶。     

某些铁-硫原子簇络合物紫外-可见光谱的研究

本文研究了某些铁-硫原子簇络合物紫外-可见光谱220～230nm吸收带λ_(max)的浓度效应,△λnm随络合物结构对称性增加而减小,随浓度基数增大而变大的变化关系,该类型络合物紫外-可见光谱吸收峰的归属;计算了Fe～Ⅱ分裂能△值;配体上的取代基效应,以及在二氯甲烷等溶剂中的溶剂效应。     

柱色谱法分离地榆中的鞣质和皂甙

 The method of liquid chromatography is successfully used in the separation of tannin and saponin from san-guisorba while no other effective way of separation has been reported so far.     

薄层扫描法测定冬眠过程中刺猬活性组织酶的周期变化

 In this paper,the determination of periodic change in the hedgehog active tissue ferment by TLC is de-scribed.The results showed that the total LDH activity and the number of LDH isozyme patterns decreasedin the BAT and other tissues of the winter hypothermic hedgehog,and increased after hibernation.     

Synthesis, Reaction and Structures of Functionally Substituted η~5-Cyclopentadienyl Compounds With Cr≡S Triple Bond [η~5-RC_5H_4Cr(CO)_2]_2S (R=CH_3C(O),CH_3O_2C,C-2H_5O_2C,CH_3CH(OH),CO_2H)

[η_5-OH_3C(O)C_5H_4Cr(CO)_2]_2S 1, [η~5-CH_3O_2CC_5H_4Cr(CO)_2]_2S 2 and [η~5-C_2H_5O_2CC_5H_4Cr(CO)_2]_2S 3 were prepared by the reactions of corresponding sodium salts of functional η~5-cyclopentadienyl-tricarbonylchromium anions with SOCl_2. Reduction of 1 with NaBH_4 prdouced [η~5-CH_3CH(OH)C_5H_4Cr(CO)_2]_2S 4, while saponification of 2 followed by acidification and recrystallization from acetone afforded [η~5-HO_2CC_5H_4Cr(CO)_2]_2S·nCH_3C·(O)CH_3 5. 1—5 are a new class of Cr≡S triple bond compounds containing functional organic group on the cyclopentadienyl ring. A single-crystal X-ray diffraction analysis of 1 revealed that it consists of two identical organometallic fragments η~5-CH_3C(O)C_5H_4Cr(CO)_2 joined together by a sulfur atom via triple bonds. The geometry of structural unit Cr≡S≡Cr belongs to linearity and the average triple bond length of Cr≡S is 2.072(?).     

8-羟基喹啉-5-磺酸金属络合物的荧光特性及其应用研究

本文报道了8-羟基喹啉-5-磺酸的金属络合物在不同条件下的荧光特性,探讨了使用激光-时间分辨技术,建立镁、铝荧光分析方法的可能性.     

First Total Synthesis of (±)-13-Hydroxy-8 (14)-abietene

(±)-13-Hydroxy-8 (14)-abietene, a rare alicyclic diterpene possessing an isopropyl group and a hydroxy group at the C-13 position, was isolated from Solidago missouriensis nutt1. Many diterpenes exhibit significant bioactivities, such as antibacterial. As a part of our synthetic studies on the naturally-occurring diterpenes, we are attemping the synthesis of the rare natural compound. To our knowledge no total synthetic work has been reported yet. In order to study the further relationship b…