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It's very water soluble and it's a big molecule, a very big molecule; it can't naturally get inside cells on its own.
它是一个水溶性极强的大分子,非常非常大的分子,质粒在自然状态下并不能自己进入细胞
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It turns out that getting large molecules like this, particularly large charged molecules like nucleic acids, inside of cells is not so easy.
后来证实,将这样的大分子物质,尤其是像核酸这样带有大量电荷的分子,送入细胞不是一件容易的事
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So we're going to finish talking about molecular orbital theory, we'll switch over to discussing bonding in larger molecules, even larger than diatomic, so we'll move on to talking about valence bond theory and hybridization.
我们要结束关于分子轨道理论的讨论，转向讨论大分子的成键，比二原子分子更大的分子，我们会继续讨论价电子成键理论,和杂化。
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The big Pharma hasn't really done research for years but then he married in the biotech area and therefore biotech companies aren't that well run but they spent a great deal in research for the large molecule drugs.
大型制药企业已经很多年没有做过相关研究,但它却与生物技术领域合作,因此导致众多生物技术公司经业绩下降,但生物技术公司在大分子药物的研究上,却投入了很多。
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Because of that you can't count on molecules moving rapidly over the size of a cell that's ten to 30 Microns in diameter.
因此不要对生物大分子能在,直径十到三十微米的,细胞里高速穿行抱有任何指望
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Hormones can be proteins, endocrine hormones can be proteins, meaning they're large molecules that are usually fairly water soluble, or they can be steroids.
激素可以是蛋白,内分泌激素可以是蛋白,这意味着激素是大分子,并且通常是水溶性的,激素也可以是类固醇
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They'd like to be able to refer to each carbon separately so they can talk about reactions with this molecule, so they number the carbons.
为了在探讨这种大分子的,化学反应时能清楚地,表示每一个碳原子,人们对碳原子进行了编号
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This is a convention that organic chemist's use when they're describing molecules like this.
这种称谓是一种惯例,是有机化学中描述像这样的,大分子时使用的
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This is incredibly important because if you picture having a double bond in a very large molecule, you could have all sorts of other atoms off this way and all sorts of other atoms off this way, and you can picture the shape would be very different if you have one confirmation versus another confirmation.
这是十分重要的,因为如果你想象在一个大分子里有一个双键，你可以在这里有各种各样的其它原子,在这里也有各种各样的其它原子，你可以想象一个构型,和另外一个构型之间的形状差别是非常大的。
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One of the reasons why you would want to segregate things into certain regions is that molecules have to move in order to accomplish these things; molecules have to move from one place to another.
将细胞功能定位于某个固定区域的,另一个原因是,生物大分子需要移动,以完成某些功能,分子从一个地方移动到另一个地方
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A polymer is just a large molecule that's made up of repeated units.
聚合物就是由,重复单位构成的大分子
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Cross-linked is not the right word-- that is chemically bonded with repeat units to make large molecules so that when you have a bunch of large molecules together they have certain physical properties like the solid property of the plastic that you're sitting on.
交联这个词不确切,应该是由化学键连接的,重复单位构成大分子,当许多分子聚合在一起后,它们就会具有某种物理特性,就像你们正坐着的,塑料一样,具有固体特性
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