螺旋键

Following this discovery, a variety of neurotoxins were characterized and their amino acids sequences, secondary structure and tertiary structure were also characterized. These toxins are polypeptides of single chain and consist of 46-49 amino acids, cross-linked by three disulfide bridges. The ordered secondary structure has been determined on the basis of NMR studies. The dominant feature is a four-stranded anti-parallel β-sheet, linked with three loop.

随后，又有多种海葵毒素被发现，并做了氨基酸序列测定，以及二级、三级结构的分析，从已报道的海葵神经毒素的一级结构来看，大都是由46-49个氨基酸组成的单链多肽，分子量5kD左右，有6个cys残基，形成3对二硫键，它们的二级结构中不存在α螺旋结构，而是4链反向β折叠，β折叠由3个大小不同的环结构相连。

Transmission movement and energy belt transmission, friction wheel drive, key transmission, harmonic drive, gear drive, rope driving and screw drive and so on mechanical drive, as well as drive shaft, shaft coupling, coupling and brake and so on corresponding shafting zero.

传递运动和能量的带传动、摩擦轮传动、键传动、谐波传动、齿轮传动、绳传动和螺旋传动等机械传动，以及传动轴、联轴器、离合器和制动器等相应的轴系零件。

Transmission movement and energy belt transmission, friction wheel drive, key transmission, harmonic drive, gear drive, rope driving and screw drive and so on mechanical seal drive, as well as drive shaft, shaft coupling, coupling and brake and so on corresponding shafting zero.

传递运动和能量的带传动、摩擦轮传动、键传动、谐波传动、齿轮传动、绳传动和螺旋传动等机械传动，以及传动轴、联轴器、离合器和制动器等相应的轴系零件。

Outer boxes Genes of interest are shown around the ring as operons for sulfate reduction, carbon fixation via acetyl-CoA synthesis pathway, and nitrogen fixation.

在单股DNA链中，碱基之间的相互作用是一个堆叠在另一个之上，而且在双螺旋中，两个互补单股的碱基对之间的氢键发挥了关键作用。

Changsha, Hunan Tianming Machinery Industrial Co., Ltd. is a transmission gear, rack, chain wheel, crane slewing reducer, coupling, machine tool accessories, dual-metal bushing, pulley, bevel gear, helical gear, charcoal machine, worm gear, non - Standard design and processing, construction of the lift gear, manual steam valve, screw and nut, machine, ring gear, spline shaft and other products Co., Ltd. specializes in processing, the company is headquartered in Changsha, Hunan, Changsha, Hunan Tianming transmission machinery Industrial Co., Ltd. has a complete and scientific quality management system.

湖南长沙天明传动机械实业有限公司是齿轮、齿条、链轮、塔吊回转减速机、联轴器、机床配件、双金属衬套、皮带轮、锥齿轮、螺旋齿轮、木碳机、蜗轮蜗杆、非标设计及加工、施工电梯齿轮、手动汽阀、丝杆及螺母、分切机、内齿轮齿圈、花键传动轴等产品专业生产加工的股份有限公司，公司总部设在湖南长沙，湖南长沙天明传动机械实业有限公司拥有完整、科学的质量管理体系。

Enzyme that separates the two strands of the double helix by breaking hydrogen bonds between the two strands.

通过打断两条链之间的氢键而将双螺旋的两条链分开的酶。

The secondary structure is assigned based on hydrogen bonding patterns as those initially proposed by Pauling et al.

如果螺旋或折叠的氢键模式太短，就会分别以T或B来编码。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。