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性的，它能产生一种称为过氧化氢酶的酶。

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. Why?

还会让你的细胞嘶嘶作响，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.

但是，当过氧化物从体外进入到你的细胞内部时，过氧化氢酶并无法起到保护作用。

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的一种酶正在进行反应，形成水和氧气。

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

它也会让你的细胞产生嘶嘶声，因为你的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.

它还会使您的细胞发出嘶嘶声，因为您的细胞中也含有过氧化氢酶。

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

但是，当过氧化物从外部进入您的细胞时，过氧化氢酶无法保护它们。

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

这主要是过氧化物与细菌内的一种酶反应，称为过氧化氢酶，形成水和氧气。

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性来区分腐生葡萄球菌和其他革兰氏阳性球菌，如链球菌和肠球菌这一类过氧化氢酶阴性的细菌。