An identification of the connections of Quillen and Beilinson-Schechtman

Given a family of Riemann surfaces and a holomorphic vector bundle Beilinson and Schechtman construct a canonical connection on the associated determinant bundle. We prove the conjecture which states that their connection coincides with the Quillen connection. This is done by reducing to the case where along fibers are invertible. Both connection forms become more accessible in this case.Supported in part by N.S.F. Grant No. DMS-9201022Supported in part by National Science Council of Republic of China Grant No. NSC 82-0208-M-002-125-T, and NSERC of Canada Grant No. OGP 0121883     

The study of terbium generated bacterirhodopsin

The localization of Terbium (Tb³⁺) cations binding to deionized bacteriorhodopsin (bR) has been studied by using spectroscopic methods. It was found that adding Tb³⁺ cations to deionized bR affects the fluorescence lifetimes of tryptophan (Trp) in bR, the wavelength of fluorescence peak shifts “blue” and the peak value of fluorescence decreases. It was also found that adding one Tb³⁺ cation to deionized bR can restore the purple state from its blue state obviously. The measurements of absorbance, fluorescence and lifetime of fluorescence also show that when more than three Tb³⁺ cations are added, no further changes can be found. It is suggested that one Tb³⁺ specific binding site for the color-controlling is located on the exterior of the bR trimer structure to negatively charged lipids near Trp-10 and Trp-12. Three Tb³⁺ cations binding per bR is needed for the regenerated bR.     

阿利新蓝的合成

阿利新蓝 (ＡｌｃｉａｎＢｌｕｅ)是一种从植物中提取出的天然物。于 1 944年由Ｈａｄｄｏｃｋ和Ｗｏｏｄ在实验室通过多次实验后所发现。它的水溶液呈天蓝色 ,着色性好而且吸光系数很大。又因它较好的水溶性。所以可以作为高效的生物染色剂[1,2 ] ,用于粘蛋白染色、细菌染色及聚酯、纤维素等人造和天然纤维的染料[3 ] 。基于它的重大应用前景和较高的商业价值 ,探索出一条合理的工业化合成路线就非常重要了。有关阿利新蓝的应用虽然有很多 ,但始终未见合成阿利新蓝的文献报道。在设计它的有机合成时必然涉及酞菁铜 (ＰｃＣｕ)的氯甲基化反…     

A New Dimeric Phthalide from Angelica sinensis

Angelica sinensis (Oliv.) Diels (Umbelliferae), known as Danggui in Chinese, one of the most important traditional Chinese medicines, is used for tonifying blood and treating female irregular menstruation and amenorrhoea. It is also used for treatment of …     

(Ph_3P)_2(CO)RuC_(60)的合成及结构表征

过渡金属—Ｃ６０配合物的合成及结构的研究是Ｃ６０化学非常重要的一个组成部分，这对于发展Ｃ６０化学及新型功能材料的开发具有很大意义．关于这方面的研究工作近年已有一些报道〔１～３〕．Ｈａｗｋｉｎｓ等关于（ｔＢｕＣ６Ｈ５Ｎ）２ＯｓＯ４（Ｃ６０）的合成及单...     

某些苯二醛类双Schiff碱及其双铜(Ⅱ)配合物研究

用2-甲氧基-5-氯-1,3-苯二甲醛与含有不同取代基团X的邻氨基酚缩合,合成了一系列双Schiff碱L-X(X=OMe,diMe,Me,t-Bu,H,Cl,NO_2),它们与乙酸铜(Ⅱ)作用生成了一系列的双核配合物Cu_2L-X(OEt).用红外、紫外、磁天平、顺磁共振等手段对配合物进行了表征,并通过量化计算(CNDO/2法)探讨了配合物的成键性质。研究结果表明,该类配合物是一个较大的共轭体系,配合物中Cu(Ⅱ).Cu(Ⅱ)之间有较强的反铁磁性交换作用,其共轭程度和交换作用强弱皆随X基团的不同而呈现某种变化规律。     

LnSrNiO4-λ系列复合氧化物的物化性质与对NO分解的催化性能

用柠檬酸络合法合成了Ｋ２ＮｉＦ４结构的ＬｎＳｒＮｉＯ４－λ（Ｌｎ＝Ｌａ，Ｐｒ，Ｎｄ，Ｓｍ，Ｇｄ）系列稀土取代类钙钛石型复合氧化物催化剂，对该系列催化剂的固态物理、化学性质及其对ＮＯ分解的催化性能进行研究。结果表明，该系列复合氧化物催化剂对ＮＯ分解活性都很高，在此基础上对该系列复合氧化物中稀土元素对ＮＯ分解反应的取代效应进行了探讨。     

2-取代亚肼基-1,3-二硫杂环戊烷类化合物的合成及其生物活性研究

以取代苯甲醛、取代吡啶和取代苯甲酸酯等为原料合成了 10种含硫杂环化合物 (其中 2a～ 2g化合物为国内外未见报道 ) .在合成过程中采用了超声波技术 ,极大地缩短了反应时间 ,提高了收率 .所得化合物的结构经IR ,1 HNMR ,MS和元素分析证实 .对其生物活性进行了初步测试 ,结果证明一些化合物具有良好的抑菌或杀菌作用 ,其中 2b ,2c ,2e ,2h ,2i和2j对大肠杆菌 ( 10 40 7号 )的抗菌效果与CET和SMZ相当 ;2b ,2c ,2f对草绿色链球菌 ( 112 3号 )的抗菌效果与CET和SMZ相当 .