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，它能产生一种称为过氧化氢酶酶。

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

还会让胞嘶嘶作响，因为其中也含有过氧化氢酶。为什么？

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

主要是过氧化物与菌内部称作过氧化氢酶一种酶正反应，形成水和氧气。

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

它也会让胞产生嘶嘶声，因为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，当过氧化物从体外入到胞内部时，过氧化氢酶并无法起到保护作用。

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.

它还会使您胞发出嘶嘶声，因为您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，当过氧化物从外部入您胞时，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菌内一种酶反应，称为过氧化氢酶，形成水和氧气。

To test for this, a few drops of hydrogen peroxide are added to the colony of the suspected bacteria.

将几滴过氧化氢添加到待测菌菌落中，可以对过氧化氢酶测试。

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菌。

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。

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

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

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.

我们毛球中胞会产生一点过氧化氢, 这是一种代谢副产物, 通常有一种叫做过氧化氢酶酶将其分解为水和氧气。

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.

但随着年龄增长，过氧化氢酶水平会下降，这会导致毛球中过氧化氢积聚，从而损害和破坏头发黑色素胞或产生色素胞。

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、兼性胞内寄生、氧化酶和过氧化氢酶阳性菌；最佳观察方式是银染色；BCYE培养基供给半胱氨酸和铁情况下生长良好，可形成雕花玻璃样灰白色菌落。

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，也是兼性胞内寄生菌，即它胞内外均可生存，氧化酶和过氧化氢酶阳性，即它可以产生这两种酶。

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、革兰染色阳性、兼性厌氧菌，无运动能力、不形成孢子，且过氧化氢酶阳性、凝固酶阴性、脲酶阳性，对新生霉素耐药，它是已知会阴正常菌群一部分。