Now, chlorine I have to do a little bit more heavy lifting here because chlorine starts as a diatomic molecule.
现在,对于氯,我将会做更多的说明,因为氯元素起初存在于双原子分子中。
So where we had left off with was we'd fully discussed up to the point of considering homonuclear diatomic molecules, so molecules that both have the same nucleus.
我们上次,讲到了我们,已经讨论过同核双原子分子,也就是有相同原子和的分子。
That there are other molecules in the lipid bilayer and they're important for cells getting information or getting molecules from outside.
还有一些其它分子在这个脂质双分子层上,它们对于细胞接收信息,和接受外来分子十分重要
So we're going to limit in our discussion in 511-1 for molecular orbital theory to diatomic molecules.
我们在这个课堂上对分子轨道1,理论的讨论仅限于双原子分子。
Then we're going to actually use MO theory to describe bonding within these molecules, and we'll start with homonuclear diatomic molecules.
然后我们要利用MO理论,来描述这些分子内的成键,我们要讨论同核双原子分子。
I mentioned a little bit that this membrane is not just lipid bilayer but there's also proteins that are inserted into the membrane.
我之前说过,这层膜不仅仅是一层脂质双分子层,而是有很多蛋白质嵌插在膜上的
I've already mentioned many times that the lipid bilayer, the cell membrane, isn't just a lipid bilayer.
我已经讲过很多遍这个脂质双分子层了,细胞膜它不只是一个脂质双分子层
If a cell membrane was indeed just a lipid bilayer, then glucose could never enter the cell because it can't permeate through cell membranes.
如果细胞膜只是一个脂质双分子层的话,葡萄糖就不可能进入细胞,因为它不能渗透过细胞膜
Then at the end, we'll look at an example with a heteronuclear diatomic molecules.
在最后,我们会看一个,异核双原子分子的例子。
And where we had left off was we were going to start one example of thinking about now where we have a heteronuclear diatomic molecules, so two different atoms in terms of forming the molecule.
我们还剩下一个,异核双原子分子的例子没讲,这里组成分子的原子,是不同的。
So they like to be in the membrane and they're stable there and they won't come out because their structure allows them to exist in these unique spaces.
所以它们在膜里稳定存在,而且也不会脱离膜,因为这些蛋白质的结构使其能存在于,磷脂双分子层这个独特的环境中
On the side over here shows a cell membrane and so this is outside the cell above it, and this is inside the cell below, and this is the lipid bilayer that separates the outside of the cell from the inside of the cell.
这边这个表示细胞膜,它的上面代表细胞外部,下面代表细胞内部,这个是脂质双分子层,将细胞内外分开
So, I will point out, in terms of MO theory, because it rigorously does take into account quantum mechanics, it starts to become complicated once we go beyond diatomic molecules.
我要指出的是,对于MO理论,以为它严格的遵守量子力学,所以一旦超过双原子分子,就变得十分复杂了。
The result of this process if this replication went down the whole length of the DNA would be to form two identical, double stranded DNA molecules.
如果复制过程在整条链上持续进行的话,将生成两条完全一样的,双链DNA分子
Now, in your book, there's an example of plasmid where I've given you the exact sequence of nucleotides that makes up the whole double stranded DNA molecule.
现在在你们书里,有个质粒样本,我将组成这个双链DNA分子的,核苷酸序列写在这里了
It has to do with the nature of this complementary binding between double stranded DNA and the fidelity of this base pair matching in forming stable DNA molecules.
这些特性能从根本上解释,为何DNA双链的碱基能互补配对,以及在形成稳定的DNA分子结构时,碱基互补配对为何具有一致性
That tells you something about the physical chemistry of the molecule; that it's these hydrogen bonds that hold the double strands and I can break those down under certain conditions.
我们从中可以知道一些,DNA分子的理化特点,双链是由氢键连接在一起,在一定条件下这些氢键可以断裂
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