不能合成的

Since C6 and higher alcohols are not obtainable by a direct biochemical route, it is proposed to synthesize these using known chemical reactions, wherein the raw material for synthesis is biogas and lower C2-C5 alcohols obtained by the inventive method wherein the amino acids leucine, isoleucine, and valine, or a mixture thereof, optionally obtained from yeast autolysate, is used as a biocatalyst at the stage of fermentation.

因为C6和更高级醇类不能通过直接生物化学途径制得，所以提出用已知的化学反应合成这些化合物，其中合成的原料为本发明方法制得的生物气和C2-C5醇类，其中任选从酵母自溶作用得到的亮氨酸、异亮氨酸和缬氨酸或其混合物的氨基酸在发酵阶段用作生物催化剂。

In other words, the results novelty broke the conclusion in the pervious reports that combustion synthesis can't occur once Fe content in Fe-Ti-C system is more than 60wt%, and gave more engineering meaning to combustion synthesis of iron-based composites.

而这正是本研究的创新点之一，即打破了前人研究所得出的"Fe-Ti-C体系中Fe含量超过60wt％就不能实现燃烧合成"的界限，从而使Fe-Ti-C体系燃烧合成制各铁基复合材料更具有工程意义。

The former, intracranially complements patients some factors, most frequently with TH gene to compensate scanty of intrastriatal DA and improve the symptoms of the patients, while have little resistance to the progressive degeneration of dopaminergic neurons; The latter provide variety of neurotrophic factors, most specific being the glial cell-line derived neurotrophic factor , to protect the residual DA neurons in the nigrostriatal system from further pathogenic injuries, while have little benefit to those DA neurons with irreversible damage, and them cannot offset the already-existing symptoms.

前者是给宿主脑内补充某些因子，主要是DA合成过程中的限速酶TH基因，以补充纹状体内DA含量的不足，减轻患者的症状，但对DA能神经元的进行性退变没有治疗效果；后者则是提供各种神经营养因子其中最具特异性的为GDNF，以保护黑质一纹状体系统内剩余的DA能经元免受病因的继续损害但对已发生不可逆性损害的DA能神经元并无拯救作用，无法消除已出现的症状。

So we propose that before the precursor is cleaved into DG and mediator, it is released from plasma membrane first, through activating some kind of enzyme by insulin or PIPLC; meanwhile, only insulin can activate the resynthesis mechanism of the precursor, in the contrast, PIPLC was inactive at this course.

推测：胰岛素或PIPLC作用于完整细胞或膜时，激活了某种酶，使前体先从膜上释放至胞外，再被水解为介体和DG，同时胰岛素还能激活再合成前体的机制，而PIPLC却不能。

Vulcanized fiber may be employed if the bushing is not less than 3/64 inch (1.2 mm) thick, and if it is so formed and secured in place that it will not be affected adversely by conditions of ordinary moisture.

10.2.4.3陶瓷材料和一些模压的合成物可用来做绝缘套管，但木质的套管，热模压虫漆，柏油合成物或者橡胶材料制成的套管不能用。

The promoted taxanes production by addition of precursors can not be explained completely with taxol biosynthetic pathway presumed.

依据已推测的生物合成途径不能完全解释已证明有效的前体对紫杉烷生物合成的影响。

The synthesis of sterically hindered peptides containing N-alkylated or 〓disubstituted amino acid residues is being a challenge, which results in difficultcondensation using the usual DCC/HOBt or HOBt-derived coupling reagents.

多肽合成的一个主要难题是富含N-烷基化氨基酸或C〓二烷基化氨基酸的肽链的合成，采用BOP或HBTU等常规缩合剂往往不能得到令人满意的结果。

The technology of culture of exogenetic NGF in vitro is qualified now, however, the exogenetic NGF cant get through blood-brain barrier and blood-nerve barrier because it is a kind of marcomolecular protein, thus its extensive application on clinic is limited, now, many scholors have turned their study direction to enhancing the content of endogenous NGF.

外源性NGF的体外合成技术已基本成熟，然而，外源性神经营养因子作为一种高分子蛋白物质不能通过消化道给药、不能通过血脑屏障和血神经屏障的问题阻碍了它在临床上的广泛应用，所以NGF在临床上并没有真正发挥出其营养神经的作用。

PCR and Southern blot analysis confirmed stable integration of the foreign genes into the chloroplast genomes of T_0 and T_1 transgenic plants, and homoplasmy of T_1 transgenic plants.

只转化phaC2基因的叶绿体型转基因烟草基本检测不到有mel-PHAs合成，共表达phaC和phaG基因的叶绿体型转基因烟草则能合成相对较高水平的mcl-PHAs。

A live, tetravalent reassortant, orally deliverable rotavirus vaccine has recently been licensed in the United States, but it has been less effective in many developing countries where the need for vaccine is the greatest.

发展灭活疫苗和亚单位疫苗也是出路之一，但是它们均不能提供内源性合成的蛋白质，因而不能产生在控制轮状病毒感染中起重要作用的细胞毒性T细胞反应，故需研究更加完善的疫苗。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。