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）一般都缺乏过氧氢酶或超氧歧酶；此氧气对他们有毒害。

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

腐生葡萄球菌是过氧氢酶阳性的，它能产生一种称为过氧氢酶的酶。

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

它也会让你的产生嘶嘶声，为你的也含有过氧氢酶。

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

还会让你的嘶嘶作响，为其也含有过氧氢酶。为什么？

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

但是，当过氧体外进入到你的内部时，过氧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.

主要是过氧与菌内部称作过氧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.

它还会使您的发出嘶嘶声，为您的也含有过氧氢酶。

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氢酶阴性的菌。

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

但是，当过氧外部进入您的时，过氧氢酶无法保护它们。

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

这主要是过氧与菌内的一种酶反应，称为过氧氢酶，形成水和氧气。

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

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

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

所以你的存有过氧氢酶，以帮助这些过氧氢转换成水和氧气，以免产生任何危害。

The cells in our hair bulb produce a little bit of hydrogen peroxide, which is a metabolic byproduct, and typically there's an enzyme called catalase that breaks this down to water and oxygen.

我们毛球的会产生一点过氧氢, 这是一种代谢副产, 通常有一种叫做过氧氢酶的酶将其分解为水和氧气。

It's a non-spore forming, aerobic, facultative intracellular, catalase and oxidase positive bacteria that is best visualized with silver stain and grows well on BCYE agar with cysteine and iron into grey-white colonies with a cut-glass appearance.

它是非芽孢、需氧、兼性内寄生、氧酶和过氧氢酶阳性的菌；最佳观察方式是银染色；在BCYE培养基供给半胱氨酸和铁的情况下生长良好，可形成雕花玻璃样的灰白色菌落。

But as we age, there's declining levels of catalase, and this allows the build-up of hydrogen peroxide in the hair bulb, which damages and destroys the melanocytes, or the pigment producing cells, of our hair.

但随着年龄的增长，过氧氢酶的水平会下降，这会导致毛球过氧氢的积聚，而损害和破坏头发的黑色素或产生色素的。

Alright, as a quick recap: Staphylococcus saprophyticus is round, gram-positive, facultative anaerobic, non-motile, non-spore forming, catalase positive, coagulase negative, urease positive, and novobiocin resistant bacterium, which is known to be part of the normal flora of the perineum.

得！来快速回顾一下：腐生葡萄球菌是一种圆形的、革兰染色阳性的、兼性厌氧菌，无运动能力、不形成孢子，且过氧氢酶阳性、凝固酶阴性、脲酶阳性，对新生霉素耐药，它是已知的会阴正常菌群的一部分。

Legionella pneumophila is non-spore forming, aerobic, which means it needs oxygen to survive, facultative intracellular, which means it can survive both inside and outside the cell, and oxidase and catalase positive, which means it produces both of these enzymes.

嗜肺军团菌是一种非芽孢好氧菌，需要氧气才能存活，也是兼性内寄生菌，即它在内外均可生存，氧酶和过氧氢酶阳性，即它可以产生这两种酶。