吡啶

Inhibition efficiency of these inh ibitors decrease with the increase of free valence of N atom; Otherwise inhibiti on efficiency increase with the increase of summation of free valence in pyridin e ring .

这些缓蚀剂随着N原子自由价的增大，缓蚀效率降低；而随着吡啶环自由价之和的增加，缓蚀效率提高。

The design and synthesis of a new unsymmetric 2, 6-bis pyridine iron catalyst and its use in ethylene polymerization.

新型不对称结构双亚胺吡啶铁系催化剂的设计、合成及其催化乙烯聚合反应研究。

The invention uses the fermentation liquor of one Escherichia coli generating polysialic acid as material, filters and removes thallus, adds some solvents as sodium chloride and alcohol into supernatant to deposit polysialic acid, dissolves the polysialic acid deposits via deionized water, filters to remove modified protein, uses alkali prolease to treat filtrate, complexes deposits via cetyl pyridinium chloride or cetyltrimethylammonium bromide, and dissociates, uses over alcohol to deposit polysialic acid, dissolves the deposits via ultra-pure water, grades and purifies via chromatography column, collects and dialyzes eluent, cools and dries to obtain polysialic acid.

本发明以一株产聚唾液酸大肠杆菌的发酵液为原料，经过过滤去除菌体，上清液加入适量氯化钠和乙醇等溶剂沉淀出聚唾液酸，聚唾液酸沉淀用去离子水溶解，再用过滤去除变性蛋白质，滤液经过碱性蛋白酶处理、氯代十六烷基吡啶或十六烷基三甲基溴化铵络合沉淀并解离后，再用过量乙醇沉淀出聚唾液酸，聚唾液酸沉淀用超纯水溶解，用层析柱进行分级纯化，收集洗脱液经过透析，冷冻干燥得聚唾液酸产品。

The reaction can be carried out in a non-aqueous solution and 4-aminopyridine can be diazotized with this method.

这个方法表现出如下优点：1），整个重氮化与偶联反应均在非水溶剂中进行；2），改变原料不同投料比，可以分别得到含有一，二，四偶联产物为主的反应产物；3），可以合成在酸性水溶液中不易重氮化的4-氨基吡啶的偶氮化合物。

Using hydrotreated gas oil as solvent, under the conditions of a reaction temperature of 400 C, a hydrogen partial pressure of 10 MPa and a reaction time of 1 h, a portion of coke deposits could be removed yet without the function of hydrogenating coke.

采用溶剂萃取法除去工业失活催化剂上沉积的焦炭和金属的研究结果表明，用四氢呋喃、吡啶和喹啉这3种含杂原子的有机强溶剂常温萃取催化剂，其去除焦炭能力很弱，而且会因这些溶剂的强吸附作用污染催化剂；盐酸洗涤能有效去除催化剂表面的钙、铁沉积层，但不能去除焦炭；低芳香性的加氢瓦斯油在400 C、H2压力为10MPa、反应1h的条件下可部分去除催化剂上的焦炭，但不具备强的氢化焦炭作用；1，2，3，4-四氢化萘因具有供给原子氢的能力，可以有效地氢化和去除催化剂上的焦炭。

In Chapter 2 and Chapter 3, two intercalates, namely 〓and 〓, were synthesized by the direct reactions of 2, 2′-bipyor phen with 〓, respectively.

第二章和第三章分别选取2，2′-联吡啶和邻菲咯啉与〓进行直接反应，合成了夹层物〓和〓。

In Chapter 4, two intercalates, namely 〓 and〓, were synthesized by the direct reactions of 4,4′-bipy· 2HCl with 〓 and 〓, respectively.

第四章通过4，4′-联吡啶盐酸盐分别与〓、〓直接反应，合成了夹层物〓和〓研究了客体在层间的存在形式。

The effect of the different coupling unit s on the spin multiplicities of the ground states and their stabilities was investigated by means of .

利用—·N—S—为自旋中心，苯为端基，苯、吡啶、哒嗪、嘧啶、吡嗪、三嗪为耦合单元，设计三种不同排列方式的新型稳定高自旋分子。

This was done by polymerizing 2-ethynylpyridine and the corresponding n-hexyl halides directly.

反应是通过直接聚合2-乙基吡啶和相对应的N-己基卤化物完成的。

The eluent was evaporated to near-dry under nitrogen and then redissolved with methanol-0.1% formic acid(1∶1,by volume),finally determined by HPLC-MS/MS.The linear range of the calibration curve was 0-50 μg/L for all pyridine herbicides.

在大白菜和橙子2种基质中分别添加5.0、10.0和20.0μg/kg3个水平，玉米基质中添加5.0、10.0、20.0和40.0μg/kg 4个水平的4种吡啶类除草剂混合标准溶液，平均回收率为70%~117%，方法的相对标准偏差小于15%。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新