查询词典 B-complex

A and B isomers could interconvert each other by an inversion of the imine nitrogen atom. In this work, we investigated the substituent effects and solvent effects. This study used the most popular one of density functional theory method unrestricted hybrid Becke three-parameter Lee-Yang-Parr (B3LYP) with the 6-31+G basis set to compute the reaction and activation energies of B/A thermal isomerization.

腙分子的异构化过程藉由转动亚胺基上的氮原子，使腙分子由A 型结构转变成B 型结构(Scheme1)，本研究运用密度泛函数理论中最常被使用的B3LYP，搭配6-31+G基底函数，计算腙分子异构化过程的活化能以及反应热，并且考虑取代基与溶剂效应对能量所造成的影响。

The diblock copolymer of styrene and chloromethyl-4-vinyl-benzene was obtained by means of reverse addition fragmentation chain transfer reaction living free radical polymerization. The chloromethyl groups in PS-b-PCVB were transformed into azidomethyl groups, and then into 1,2,3-triazol groups via click chemistry. The diblobk copolymer containing 1,2,3-triazol groups was thus obtained. The results from NMR spectra suggested a complete transformation from chloromethyl groups to triazol groups.

通过可逆加成－断裂链转移聚合活性自由基聚合方法制备了聚（苯乙烯－b-对氯亚甲基苯乙烯）二嵌段共聚物，其中的氯亚甲基侧基经叠氮化反应后与丙炔醇进行点击反应，最终得到了含有1，2，3-三氮唑官能团的聚苯乙烯二嵌段共聚物，核磁共振谱表征结果证明，PS-b-PCVB中的氯亚甲基完全转变成了1，2，3-三氮唑基团。

In addition, we found that 4-phenyl-l,2,4-triazolinium N-ylides reacted withvarious electron-deficient olefins to afford pyrrole derivatives in good yields via 1,3-dipolar cycloaddition oxidative ring fission, In some cases, tetrahydropyrrolo[1,2-b]triazole and pyrrolo[1,2-b]triazole, which are stable and are not aromatized orcleaved in the reaction conditions, could be isolated, This is a facile and novel route forthe synthesis of pyrrole derivatives.

此外，本文研究了五员三氮杂环化合物4-苯基1，2，4-三氮唑的N-叶立德，发现在氧化剂存在下与缺电子烯烃发生1，3-偶极环加成反应生成的吡咯并[1，2-b]三氮唑，在大多数情况下开环生成吡咯衍生物，反应条件温和，收率良好，是合成吡咯衍生物的一个新的途径。

If only enough rope is available for a belay from one bank, A crosses as above. C ties into the main belay rope and also ties on alight retrieving cord held by Band is belayed by A. This retrieving line is necessary since it would probably be impossible to throw the rope back to B after C crosses.

如果绳子的长度只够从一边作确保，A仍像上述过溪，C要套入胸部绳圈中由A作确保工作，同时要有另外一条回收绳连接到B手上作主绳的回收工作，这条回收绳是必要的因为C过溪之后几乎不可能将主绳抛回去给B。

Methods 414 patients who underwent ERCP were divided at random into 3 groups; group A (n=158) receiving perioperative intravenous cimetidine, 800mg/day for 3 days; group B (n=147) having hypodermic octreotide, 0.1mg, 30 minutes before and 4 hours after ERCP; group C (n=109) being given boluses of placebo.

方法将414例患者随机分为A、B、C三组，A组(158例)分别于术前一日、当日及术后一日给予西咪替丁(800mg/d，静脉滴注)，B组(147例)分别于术前30min及术后4h内给予生长抑素类似物奥曲肽0.1mg皮下注射，C组(109例)给予安慰剂。

Therefore, due to the fact that the (111) pole density in the subsurface of decarburized bands still have a higher intensity, adding Mo into Hi-B steels could lower the slab reheating temperature.

本文采用X射线极密度和取向分布函数方法，证明含Mo Hi-B钢采用1310℃低温铸坯加热时，其热轧板表层织构特征与不含Mo并在1380℃高温铸坯加热时相似，为典型的剪切形变织构，两者的热轧板与脱碳板表层织构特征也极为相似，而含Mo Hi-B钢在1380℃铸坯加热时却没有以上这些相似性。

Using modified conventional powder metallurgy process for sintered Nd-Fe-B magnets , including annealing of ingot alloy, hydrogen decrepitating, modified jet mill and adding additive during jet milling, we have mass-produced high performance and high corrosion resistance sintered Nd-Fe-B magnets from a conventional ingot alloy without strict protections against oxidation.

利用改进的传统粉末冶金工艺(铸锭热处理、氢爆、改进型气流磨设备以及在气流磨中掺入添加剂等)，在无严格的防氧保护情况下，从传统合金铸锭出发，工业化生产出具有高耐蚀性的N48～50档烧结Nd-Fe-B 磁体。

AIM: To investigate the expression of human β-defensin-2 (hBD-2) mRNA and the changes of NF-κB activity induced by lipopolysaccharide in human primary epitheliums. METHODS: The pulmonary primary epitheliums from human were stimulated with LPS and the expression of hBD-2 mRNA was detected by reverse transcription polymerase chain reaction.

目的：观察脂多糖诱导人气道上皮细胞人β防御素－2(hBD-2)的表达及核转录因子κB活性的变化，探讨NF-κB在LPS诱导人气道上皮细胞hBD-2表达中的作用。

Group B apply with the treatment of fumigating with traditional Chinese medicine.

90例患者，随机分为A、B两组，各45例。A组：采用骨通贴膏外敷结合磁振热治疗仪脉冲治疗方法；B组：采用中药熏蒸治疗的方法。

In this study,the muscarinic current was induced by carbachol(50 umol/ L) or GTPYB(0.5 mmol/L).The results showed that hyposmotic superfusate(202mOsmol/ L) increased carbachol-induced current by 145士27%and increased GTPYS-induced current by 183士30%;but in the presence of cytochalasirr B(cyt- B,20 umol/ L),an actin cytoskeleton disrupter,posmotic membrane stretch increased 1CC6 by 70士6%.However,hypos motic membrane tretch induced increase in 1CC6 was potentiated to 545士81% by phalloidin(20 umol/ L),an actin microfilament stabilizer.

当豚鼠胃窦平滑肌细胞的膜电位钳制在一20 m V时，灌流液中50umol/ L卡巴胆碱(carbachol ， CCh)或电极内液中0.5 mmol/L GTPYS均可引导毒覃碱电流，2 m Os mol/ L分别使其增加145士27%和183士30；当电极内液中加入20 umol/ L的细胞松弛B时，低渗牵张使1 cce只增加70士6；而电极内液中加入20 umol/ L的鬼笔环肤则使Icce增加了545士81。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。