查询词典 2-butene

Petals golden yellow, sometimes tinged red, obovate-oblanceolate, 2-2.5 × 1.2-1.5 cm,(1.5-) 2.5-3 × as long as sepals; margin entire, eglandular; apiculus acute to obtuse.

花瓣金黄色，有时微染红色，倒披针形， 2-2.5 * 1.2-1.5 厘米，长为萼片的( 1.5-) 2.5-3倍；边缘全缘，无腺体；细尖的锐尖到钝。

The half-life of 35S-methamidophos on the Azolla, water,fish and straw are 1.5, 2.8, 6.2 and 2.2 days respectively.

35S-甲胺磷在模拟共生体系中按指数回归消失，它在萍、水、鱼和稻草上的半衰期分别为1.25、2.8、6.2和2.2天。

In Chapter 6, we show that H(G_1)= H(G_2)= x~2(x + 1)~2H_3(G_1 - H_3(G_2), H_2(G_1)- H_2(G_2)=(x~2 + x - 1)~2H_3(G_1 - H_3(G_2) and H_(23)(G_1)-H_(23)(G_2)= 2(x~2+x -1) H_3(G_1—H_3(G_2) for arbitrary catacondensed benzenoid graphs G_1 and G_2 with equal number of hexagons.

在第六章中我们证明了：对于任意的有同样多六角形的cata-型苯系统G_1和G_2，有H(G_1)-H(G_2)=x~2(x+1)~2H_3(G_1-H_3(G_2)，H_2(G_1)-H_2(G_2)=(x~2+x-1)~2H_3(G_1-H_3(G_2)和H_(23)(G_1)-H_(23)(G_2)=2(x~2+x-1)H_3(G_1-H_3(G_2)。

The results of bioassay suggest that 2-methylthio-6-methyl-4-substituted pyrimidine and 4, 6-dimethoxy-2-substituted pyrimidine derivatives show herbicidal activity. In these target compounds, 4, 6-dimethoxy-2-substituted pyrimidine benzylamine and 4, 6-dimethoxy-2-Substituted pyrimidine benzylidene amine exhibit good herbicidal activity, and the herbicidal will be affected by the substituents in the benzene ring.

对分子库中的目标分子进行了生物活性筛选研究，发现其中的2-甲硫基-6-甲基-4-取代嘧啶衍生物和4，6-二甲氧基-2-取代嘧啶类化合物显示出除草活性，其中4，6-二甲氧基-2-取代嘧啶苄胺类化合物和4，6-二甲氧基-2-取代嘧啶亚苄胺类化合物具有较好的除草活性，而且其活性和苯环上的取代基有关。

The separation of optical isomers of 2, 2'-dihydroxy-1, 1'-binaphthyl and 2, 2'-diamino-1, 1'-binaphthyl was studied by reversed-phase high performance liquid chromatography on a chiral stationary phase consisting of-hydroxypropyl-β-cyclodextrin (Cyclobond Ⅰ 2000 SP)using methanol/water as the mobile phase. The effects of mobile phase ratio, flow rate and column temperature on separation of optical isomers of DHBN and DABN were investigated.

在S-羟丙基－β-环糊精手性柱(CyclobondⅠ2000 SP)上用反相高效液相色谱法研究了2，2'-二氨基－1，1'-联萘和2，2'-二羟基－1，1'-联萘光学异构体的分离，考察了流动相组成、流速以及柱温等对联二萘胺和联二萘酚光学异构体分离的影响。

From the optically active 2, 2'-dihydroxy-1,1 '-binaphthyl, through esterification, Kumada coupling, bromization, hydrolization and Wittig elimination reaction, 2,2'-diethynyl-1,1'-binaphthyl was obtained.

从光学活性的2，2'-二羟基-1，1'-联萘出发，经过酯化，Kumada偶联，溴化，水解和Wittig消除反应五个步骤，成功地获得了具有单一手性的的2，2'-二乙炔基-1，1'-联萘。

The chiral polymer P-1 shows strong blue fluorescence due to the extended π-electronic structure between the chiral repeating unit-6,6'-di(4-trifluoromethyl-phenyl)-2,2'-bisoctoxy-1,1'-binaphthyl and the conjugated linker 2,2'-bipyridyl group via vinylene bridge.

手性高分子P-1能发射强的蓝色荧光，这是由于手性重复单元-6，6′-二(4-三氟甲基苯基)-2，2′-二正辛氧基-1，1′-联萘和单元2，2′-联吡啶通过亚乙烯基桥连形成共轭高分子结构造成的。

The crystal structures of two complexes have been determined by X-ray diffraction as: complex (11) is distorted octahedron configuration,α=15. 9002 (6), b=16. 2413 (5), c=23. 4401 (8)〓,β=90°, V=6053. 2 (4)〓, Z=8 and R=0.0531; complex (8) is trigonal bipyramidal configuration,α=9. 3476 (8), b=17. 4236 (13), c=9. 7836 (8)〓,β=91. 197 (3)°, V=1593. 1 (2)〓, Z=2 and R=0.0325, which shows that three secondary amine groups (N-1, N-2, N-3) of the glycosylamine ligand forms the equatorial plane, and the tertiary amine (N-4) and one Cl〓 are pointed on the apical positions.

分别对其进行X-ray衍射分析可以得出：配合物(11)的晶体数据为α=15.9002(6)，b=16.2413(5)，c=23.4401(8)〓，β=90°，V=6053.2(4)〓，Z=8 and R=0.0531，为畸变的八面体构型，而配合物(8)中，α=9.3476(8)，b=17.4236(13)，c=9.7836(8)〓，β=91.197(3)°，V=1593.1(2)〓，Z=2 andR=0.0325，为三角双锥构型，糖胺配体的三个氮原子（N-1，N-2，N-3）位于赤道平面上，而另外一个氮原子（N-4）和一个Cl〓位于轴向上。

In the procedures of syntheses, we chose 2,2"-bipyridine (2,2"-bipy), 4,4"-bipyridine (4,4"-bipy), 1,10-phenanthroline (1,10-phen) and 8—hydroxyquinoline as neutral ligands, and lead, copper, zinc, cadmium and manganese as metal ions in our research.

使用的中性配体为2，2′-联吡啶(2，2′-bipy)、4，4′-联吡啶(4，4′-bipy)、1，10-邻菲罗啉(1，10-phen)和8—羟基喹啉，研究的金属离子为主族金属Pb以及过渡金属Cu、Zn、Cd和Mn。

Female flowers solitary or several and male mixed in axillary cluster; pedicels 2-6 cm; calyx yellow-green, 6-lobed; sepals slightly thick, biseriate, outer obovate or subspatulate, ovate-elliptic, 6-7 × 3-4 mm, inner shorter, obovate, ca. 5 mm, with purple stripes; disk absent; pistil depressed globose, ca. 2 × 2.7 mm, 3-locular; styles 3, bifid at apex, arms recurved.

雌花单生或数个雌花和雄花在腋生簇束里混生；花梗2-6厘米；花萼黄绿色，6裂；萼片稍厚， 2列，外部倒卵形或近匙形，卵状椭圆形， 6-7 * 3-4 毫米，内部的短，倒卵形，长约5毫米，有紫色条纹；花盘无；雌蕊扁球形，约2×2.7毫米，3室；花柱3，在先端2裂，裂片下弯。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。