Crick was supposed to be completing a thesis on the X-ray diffraction of large molecules.

而克里克则称在完成一篇用X射线衍射大型分子的论文。

DNA is a polymer because it is a large molecule composed of repeated subunits, the nucleotides.

DNA 是一种聚合物，因为它是由重复的亚基，即核苷酸组成的大分子。

Mucins are the primary large molecules in mucus and are essential for giving mucus its slippery feel.

黏蛋白是黏液中最大的分子它们让黏液有滑溜的感觉。

These normally have small gaps between them and have a negative electrical charge, both of which prevents large molecules from filtering through.

通常在它们之间具有小间隙，并带有负电荷，这两者都是为了防止大分子滤过。

When used in digestion, enzymes break down the large molecules in your food into the building blocks that your cells can actually absorb.

当用于消化时，酶将食物中的大分子分解成细胞可以真正吸收的“积木”。

This heme is a large molecule that's made up of four pyrrole subunits that form a ring, and this structure is called a porphyrin.

血红素是一个由4个吡咯亚基形成的环状大分子，这种结构称之为卟啉。

This heme is a large molecule that's made up of four pyrrole subunits that forms a ring, and this structure is called a porphyrin.

血红素是个大分子，由四个吡咯亚基形成环形，这个结构叫作卟啉。

Those large molecules are called biological molecules — also known as macromolecules — and everything that you eat, I hope, is at least partially made of them.

这些大分子被称为生物分子——也被称为大分子——你吃的所有东西，（我希望）至少部分是由它们组成的。

The word 'plastic' can describe any material made of polymers, which are just the large molecules consisting of the same repeating subunit.

“塑料”一词可以描述任何由聚合物制成的材料，聚合物只是由相同的重复亚基组成的大分子。

When damaged, therefore, membrane permeability increases and large molecules are allowed to be filtered into the urine like proteins, called proteinuria, and even red blood cells, called hematuria.

当足突细胞受损时，膜通透性增加，大分子被允许过滤到尿液中：像是蛋白质，造成蛋白尿；甚至是红细胞，造成血尿。

The pulses can also be used to nudge large molecules, which then go on to emit characteristic radiation that depends on their precise chemical make-up.

这些脉冲还可用于推动大分子，然后大分子继续发射取决于其精确化学组成的特征辐射。

The lymphatic system has key advantages: for example it can pick up larger molecules, like hormones, that are too large to get into the capillaries, and get them into the bloodstream.

淋巴系统具有关键的优点：它能收集更大的分子，如对进入毛细血管来说太大的激素，且能够将它们带入血流。

The resulting glucose can then be used for the plant's energy needs or built up into larger molecules like starch and cellulose, the primary structural component of plant cell walls.

由此产生的葡萄糖可用于满足植物的能量需求或形成较大的分子，如淀粉和纤维素，植物细胞壁的主要结构成分。

Five weeks after the experiment began, all the plants were covered by bags that allowed carbon dioxide, oxygen and water vapour in and out, but stopped the passage of larger molecules, of the sort a beanstalk might use for signalling.

五周过后，实验人员给所有的蚕豆都罩上了袋子，这种袋子允许二氧化碳、氧气和水蒸气出入，但那些豆茎可能用来发送信号的大分子物质，却无法通过。

And so even though London dispersion forces are the weakest, if you have larger molecules and you sum up all those extra forces, it can actually turn out to be rather significant when you're working with larger molecules.

因此，即使伦敦色散力最弱，如果你有更大的分子， 并且你将所有这些额外的力加起来， 当你处理更大的分子时， 它实际上会变得相当重要。

Evolution has provided a goodly range of these in the form of enzymes, which are large, complicated and sometimes temperamental protein molecules, but which have the advantage that they can create pure versions of what are known as optical isomers.

进化以酶的形式提供了大量的这类物质，这些酶是大型的、复杂的、有时还会变化无常的蛋白质分子，但它们的优点是可以产生被称为光学异构体的纯净版本。

But the greatest example of thioacetone's silent-but-deadly strength comes from the German city of Freiburg where in 1889, chemists at a soap factory were, reportedly, working on a larger molecule known as tri-thioacetone, which is used as a flavoring and a fragrance.

关于丙硫酮沉默却要命的力量，最佳例子来自德国弗莱堡市，那是1889年，据记载一家肥皂厂的化学人员正研究一种叫做“三聚硫酮”的大分子，以作为调料和香味剂。