碱的

There is a good market for betaine,So its synthetic method and purification have captured people's attention.

在介绍甜菜碱市场现状，发展前景及传统生产方法的基础上，重点论述了萃取结晶法生产甜菜碱的原理、特点、萃取剂的选择等，证明萃取结晶法提纯甜菜碱是可行的。

The young common carp was fed with trial diets added respectively L-carnitine byo,0.5×10-4,1.0×10-4,1.5×10-4,2.0×10-4,2.5×10-4 to compare the fat digestibilities of the diets with control diet and get fitting additive number.

分别用在每kg饲料中添加了0、50、100、150、200、250mg纯肉毒碱的饲料饲养鲤春片鱼种，用全收粪法测定鲤对每种饲料粗脂肪的消化率，比较不同添加量的肉毒碱对鲤春片鱼种饲料粗脂肪消化率的影响，旨在寻求鲤春片鱼种中肉毒碱的适宜添加量。

We discussed the syntheses of two different types of plant alkaloids in this thesis. In part A, we aimed at total syntheses in two kinds of aporphine alkaloids, lirioferine and boldine. In part B, we developed a tactic about radical cyclization in polyhydroxylated piperidine synthesis.

中文摘要本篇论文中探讨了两种不同种类植物碱的合成，在A部分中，我们针对阿朴吩类天然物中的鹅掌楸啡碱与波儿丁碱做了各自的全合成研究；在B部分中，我们发展了一种自由基环化策略运用在含多羟的哌啶类化合物之合成上。

Starting from piperonal, the initial total synthesis of CET involved BischlerNapieralski reaction, 3, 2-sigmatropic rearrangement, unusual Nazarov-type electrocyclization, and autoxidative dehydrogenation of desmethylcephalotaxine to desmethylcephalotaxinone etc.

第一条路线我们以胡椒醛为起始原料，经Bischler-Napieralski反应，[3，2]-σ重排，6-6环系到7-5环系的还原重排，Nazarov氧化环化；碱性条件下脱甲基三尖杉碱到脱甲基三尖杉酮碱的氧化脱氢等20步反应，完成了三尖杉碱的全合成。

Furthermore, a biogenesis-based synthesis of CET was developed, which realized the plausible biogenetic transformation by a transannular reductive skeletal rearrangement of cyclic amino enone 45 to key ring skeleton of CET under mild condition directly.

化合物17经Wacker氧化、环化得到重排前体不饱和酮45，45在温和的还原条件下重排得到三尖杉碱五环骨架化合物34，从而实现了三尖杉碱的全合成。第二条路线较前一条步骤更短，合成更方便，收率更高（从二酯化合物8计合成三尖杉碱的总收率可达10％）。

Alkaline granitoids include alkaline and peralkaline granite, its associated katnosite and quartz syenite, and its associated and compositionally_similar alkali feldspar granite and rich_alkali meta_aluminous granite.

碱性花岗岩类包括碱性和过碱性花岗岩及与之伴生的英碱正长岩、石英正长岩，以及与之伴生并且成分相近的碱长花岗岩和富碱的偏铝质花岗岩。

The Brief Analysis of Marketing : Presently, the demand for the lon membrane alkali keeps increasing. From 1997 to 2005, the average growth rate is 1.9%. It is estimated that the growth rate will be over 3.5% this year, because of it, the sales foreground is vastitude.

市场简要分析：目前世界片碱需求保持较强的增长势头，1997年至2005年的年平均增长率为1.9%，预计今年国内片碱的增幅将在3.5%以上，因此离子膜法片碱市场前景看好。

In this open study we investigated the correlation between seminal carnitine levels and spermatozoal function, and the effect of combined L-carnitine + L-acetylcarnitine therapy, in infertile men.

在本开放式研究中，我们研究了精液中肉碱的含量与精子质量和功能的相关性，以及复合使用左旋肉碱和乙酰左旋肉碱对治疗男性不育的疗效。

Results The pD2 value (the affinity to M-receptors of agonist) of Erycibele alkaloid's miosis is 3.60±0.15 and its IOP lowering action is 3.49±0.07. In the isolated iris contracting experiment, its pD2 value is 6.38±0.12. M3 receptor antagonist is the strongest antagonist in inhibiting the miosis, IOP lowering action and isolated iris pupillary contracting action of Erycibele alkaloid. 0.01% Erycibele alkaloid can cause the decrease of cAMP and the increase of cGMP in the aqueous humor.

结果 测定丁公藤碱缩瞳作用的pD2值为3.60±0.15，降眼压作用的pD2值为3.49±0.07，离体虹膜收缩作用的pD2值为6.38±0.12.M1～M3受体拮抗剂均可拮抗丁公藤碱的缩瞳作用、降眼压作用及离体虹膜收缩作用，其中以M3受体拮抗剂的拮抗作用最强。0.01％丁公藤碱可使房水环磷酸腺苷(cyclic adenosine monophosphate，cAMP)含量降低，环磷酸鸟苷(cyclic guanosine 3，5-monophosphate；cGMP)含量升高。

The thesis here described the chiral resolution of Betti Base and the synthesis of their derivatives, as well as their applications as chiral ligands in asymmetric synthesis.

本文选择了Betti碱及其手性衍生物为研究目标，完成了Betti碱的拆分、手性配体结构的合成，以及它们在催化不对称合成中的初步应用。第一章主要解决了Betti碱1的拆分问题。

He and Nina moved to California and lived at 2005 Ivar Street, Apt.

他和Nina搬到加州，并在2005年伊瓦尔街，公寓生活。

Droperidol （ potently inhibits transfected HERGchannels and this is the probable mechanism for QT prolongation.

氟哌利多有效地抑制了转染的 HERG 钾通道，可能是 QT 间期延长的机制。