螺旋形成

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。

The distribution of the liquid film was got, and the effects of helix angle, geometry of the channel, liquid mixing and liquid properties on the liquid film was also studied.

考虑表面张力和重力的作用，利用流体力学的基本方程建立单组分流体在水平螺旋槽管的管壁形成液膜的拟线性模型 3。

More fine and lighter dust particles are fetched into the upper by the upper spiral airflow, forming strong spirally ash hoop at the inside of the top gap and bringing forth the accumulation of the dust particles, then are drawn forth from the upper entrance of special dust insulator, through the lower helical groove of dust insulator, tangential admission to the dust collector from the air return mouth of the dust collector's outside.

较细较轻的灰粒，由上旋涡气流带往上部，在顶盖下面形成强烈旋转的灰环，产生灰粒的集聚，并被从特设的灰尘隔离室上部洞口引出，经过灰尘隔离室的下部螺旋槽，从除尘器外壁回风口切向引入除尘器，筒体下部与内部气流汇合，灰粒被分离而落入灰斗。

Peptide bonds composed of glycine form interchain hydrogen bonds with two other collagen polypeptide chains, and this results in a stable triple helix.

例如，某些蛋白质中包含了有α-螺旋结构存在的区域和另外不能形成这种结构的区域。

PURPOSE: To assess the value of combined spiral CT pulmonary angiography and venography in the diagnosis of pulmonary embolism and deep venous thrombosis.

目的：探讨螺旋CT肺动脉与静脉联合造影在肺栓塞及深静脉血栓形成中的诊断价值。

VF speedregulating motor is adopted (in combination with planet differential gear) to form a rotation differential of 0.0167~ 0.025 r/min between the spiral propeller and the drum.

采用变频调速电动机（与行星齿轮差速器配套使用），使螺旋推进器与滚筒之间形成0.016 7～0.025 r/min的转速差。

The original contact surface is a helical plane tooth surface of which the solid model can be easily obtained, and the new contact surface is a complicated curved surface formed by the so-called new contact lines.

原来的接触面是螺旋面牙齿表面的实体模型，可以轻易取得，而新的接触面，是一项复杂的曲面形成了所谓新的联络线。

Behind the enzyme, the DNA double helix re-forms, stripping off the newly synthesized RNA strand.

在多聚酶后， DNA 双螺旋又重新形成，新合成的 RNA 链也从 DNA 分子上脱落。

To look for ones that might preent the conformational changes that lead to the formation of this bundle.

为了寻找一个能够阻止螺旋束形成的构想变化的复合物。

The Helix planetary nebula is constructed from matter ejected by a dying Sun-like star, almost 690 light-years away.

这种螺旋行星状星云是由一颗即将消逝的恒星所喷发出来的大量物质所有形成的，大概距离地球690光年。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失