And it'll also make your cells fizz, because your cells also have catalase in them.

也会让你细胞产生嘶嘶声，因为你细胞中也含有过氧化氢酶。

And it'll also make your cells fizz, because your cells also have catalase in them. Why?

还会让你细胞嘶嘶作响，因为其中也含有过氧化氢酶。为什么？

But, when peroxide comes at your cells from the outside, the catalase can't protect them.

是，当过氧化物从体外进入到你细胞内部时，过氧化氢酶无法起到保护作用。

Staph saprophyticus is catalase positive, so it makes an enzyme called catalase.

腐生葡萄球菌是过氧化氢酶阳，能产生一种称为过氧化氢酶酶。

That's mostly the peroxide reacting with an enzyme inside the bacteria, called catalase, forming water and oxygen gas.

主要是过氧化物与细菌内部称作过氧化氢酶一种酶正在进行反应，形成水和氧气。

Anaerobes, clostridia included, tend to lack the enzymes catalase or superoxide dismutase, so oxygen is actually toxic to them.

厌氧菌（包括梭菌）一般都缺乏过氧化氢酶或超氧化物歧化酶；因此氧气对他们有毒害。

And it’ll also make your cells fizz, because your cells also have catalase in them.

而且还会让你细胞起泡，因为你细胞中也含有过氧化氢酶。

And so when we do it in class we're using catalase.

因此，在课堂上进行实验时，我们使用是催化酶。

Now when we do the enzyme lab we are using catalase.

在我们进行酶实验时，使用是催化酶。

I'm taking hydrogen peroxide and then I'm simply adding a catalase to it.

我正在使用过氧化氢，然后我只是向其中添加了催化剂。

But, when peroxide comes at your cells from the outside, the catalase can’t protect them.

当过氧化氢从外部接触到细胞时，过氧化氢酶就无法保护们了。

Our enzyme that we talked about is called catalase.

我们讨论过那种酶叫做催化酶。

So, if catalase is present, like in staph saprophyticus, it makes hydrogen peroxide dissociate into water and oxygen, making the mixture foam.

如果存在过氧化氢酶（如腐生葡萄球菌），会使过氧化氢分解成水和氧气，使混合物出现泡沫。

We can use this to differentiate Staph saprophyticus from other gram positive cocci, like streptococci and enterococci, which are catalase negative.

我们可以利用这一特来区分腐生葡萄球菌和其他革兰氏阳球菌，如链球菌和肠球菌这一类过氧化氢酶阴细菌。

That’s mostly the peroxide reacting with an enzyme inside the bacteria, called catalase, forming water and oxygen gas.

那主要是过氧化氢与细菌内一种酶——过氧化氢酶——反应，生成水和氧气。

So catalase is going to be a protein.

所以催化酶是一种蛋白质。

So your cells are stocked with catalase to help turn that hydrogen peroxide into water and oxygen before it can do any harm.

所以你细胞中存有过氧化氢酶，以帮助这些过氧化氢转换成水和氧气，以免产生任何危害。

One of the major ones we'll talk about this year in AP bio is called catalase.

今年在AP生物课上我们将讨论一个重要概念叫做催化酶。

And it uses catalase to do that.

且使用催化酶来完成这个过程。

I was reading that 40 million hydrogen peroxides will go into a catalase and be broken down into water and oxygen, 40 million every second.

我读到过，每秒有四千万个过氧化氢分子进入催化酶中，被分解成水和氧气。