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

它也会细胞产生嘶嘶声，因为细胞中也含有过氧。

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

腐生葡萄球菌是过氧阳性，它能产生一种称为过氧。

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

还会细胞嘶嘶作响，因为其中也含有过氧。为什么？

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

主要是过氧物与细菌内部称作过氧一种在进行反应，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）一般都缺乏过氧或超氧物歧；因此氧气对他们有毒害。

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

但是，当过氧物从体外进入到细胞内部时，过氧并无法起到保护作用。

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

它还会使您细胞发出嘶嘶声，因为您细胞中也含有过氧。

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

将几滴过氧添加到待测细菌菌落中，可以对过氧进行测试。

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

但是，当过氧物从外部进入您细胞时，过氧无法保护它们。

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

这主要是过氧物与细菌内一种反应，称为过氧，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阴性细菌。

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

所以细胞中存有过氧，以帮助这些过氧转换成水和氧气，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.

如果存在过氧（如腐生葡萄球菌），它会使过氧分解成水和氧气，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.

我们毛球中细胞会产生一点过氧, 这是一种代谢副产物, 通常有一种叫做过氧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，过氧水平会下降，这会导致毛球中过氧积聚，从而损害和破坏头发黑色素细胞或产生色素细胞。

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、兼性细胞内寄生、氧和过氧阳性细菌；最佳观察方式是银染色；在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。

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、兼性厌氧细菌，无运动能力、不形成孢子，且过氧阳性、凝固阴性、脲阳性，对新生霉素耐药，它是已知会阴常菌群一部分。

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细菌，需要氧气才能存活，也是兼性细胞内寄生菌，即它在细胞内外均可生存，氧和过氧阳性，即它可以产生这两种。