二戊烯

Regulation of the supply of precursors and expression levels can contribute to the heterologous biosynthesis systems as well.

过度的几个基因的上游，在类异戊二烯生物合成的结果是确定和克服的瓶颈，在这方面的门路。

ROMP of DCPD initiated by the well-definined carbene complex RuCl〓 was conducted for the first time. Influence of polymerization conditions was investigated.

首次以结构明确、组分单一的催化剂〓催化双环戊二烯活性ROMP反应，考察了聚合反应条件对反应结果的影响。

By splicing in genes from other bugs, the company was able to engineer synthetic metabolic pathways—ones that do not exist in nature—that enable the bacteria to produce isoprene from the sugars found in plant materials such as sugar cane, corn cobs and switchgrass, a tall-growing variety native to North America.

Genecor的科学家们将其它细菌的基因拼接到大肠杆菌上，从而在大肠杆菌上制造出一种自然界中不存在的代谢物合成途径。它使细菌能从植物材料中的糖分生产出异戊二烯——这些含有糖类的植物包括甘蔗、玉米芯，还有原产于北美洲的高个儿品种柳枝稷。

Because of its structure, the length of the different isoprenoid side chain can form different coenzyme Q.

因其结构中，类异戊二烯侧链的长度不同，可形成不同的辅酶Q。

Linear solvation energy relation was firstly introduced in the paper, and the method and step of gaining the special parameters of solvent and solute were introduced in detail, and these special parameters were used to selection and optimization of extractive agent in extractive distillation. The model of predicting activity coefficient at infinite dilution was established by linear solvation energy relation. By the above theory, several candidate solvents were selected to separate C5 fraction, and by experiment of vapor-liquid phase equilibrium at atmosphere pressure, the mixture of N-methyl-pyrrolidone including 4% water was used extractive agent of separating C5 fraction. Then binary vapor-liquid phase equilibrium of the some compound in C5 fraction and N-methyl-pyrolidone were determined at atmosphere pressure and correlated by NRTL equation. Isoprene being objective compound, experiments were operated in the laboratory-scale column; the processes were simulated by RadFrac model in ASPEN PLUS. And by the combination of experiment and simulation, the new process of separation of C5 was established.

本文首先对线性溶剂化能关系进行了分析介绍，也介绍了采用溶剂化能关系得到溶质溶剂特性参数的方法步骤，并将这些参数用于萃取精馏萃取剂的选择与优化；也通过线性溶剂化能关系式建立无限稀释活度系数预测模型，取得了一定的预测精度；将通过上述方法初选的溶剂进行了常压汽液平衡的测定研究，通过实验研究选定含水4%的N-甲基吡咯烷酮溶液做为C5分离的萃取剂，测定了大量N-甲基吡咯烷酮与C5组分的二元平衡数据，并进行关联计算；以异戊二烯为目标产物在实验室规模的精馏塔内进行了C5分离的实验研究，取得大量塔内数据；通过选用合适的热力学模型，采用ASPEN中RadFrac模块对分离过程进行模拟研究，通过实验与模拟相结合，建立了C5分离的新工艺，为将来的工业化打下了坚实的基础。

According to people who had moustaches, inhaling the air component quantitative analysis and found that the air sucked into the presence of dozens of hazardous substances, including phenol, toluene, acetone, isoamyl asked diene, and other carcinogens,, Who had moustaches, who inhaled the air pollution index, is 4.2 times that of ordinary air.

据对留有胡子的人吸入的空气成分进行定量分析，发现吸进的空气中含有几十种有害物质，其中包括酚、甲苯、丙酮、异戊问二烯等多种致癌物，留有胡子的人吸入的空气污染指数，是普通空气的4.2倍。

RESULTS: The total GKB yields were enhanced 69%, 13.8%and 11.4%compared with the control by adding 100 mg.L-1 of isoprene and low concentrations (10 and 50 mg.L-1) of geraniol in the medium, respectively.

结果：于培养基中添加100 mg.L-1异戊二烯及低浓度(10 mg.L-1，50 mg.L-1)的牛儿醇能提高GKB的产量，分别比对照增加了69%，13.8%和11.4%。

By the cultivation of Hevea brasiliensis in Brazil, harvesting of the latex obtained, the basic chemical composition of cis - polyisoprene.

由种植的巴西三叶橡胶树割取的胶乳制得，基本化学成分为顺－聚异戊二烯。

Theoretical investigation of the solvent effects on the mechanism of the reaction of pentafulvenone with hydrocyanic acid to produce the main product of acid of type b was carried out at B3LYP/6-311+G** level via the conductor-like polarizable continuum model.

在B3LYP/6-311+G**计算水平上，采用导体极化连续模型研究了溶剂化效应对6-亚甲基环戊二烯酮与HCN反应生成主要产物b类酸的反应机理的影响。

Theoretical investigation of the solvent effects on the mechanism of the reaction of pentafulvenone with hydrocyanic acid to produce the main product of acid of type b was carried out at B3LYP/6-311+G(superscript **) level via the conductor-like polarizable continuum model.

在B3LYP/6-311+G计算水平上，采用导体极化连续模型研究了溶剂化效应对6-亚甲基环戊二烯酮与HCN反应生成主要产物b类酸的反应机理的影响。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。