It consists of peptidoglycan which usually helps differentiate whether bacteria are gram positive or gram negative.

细胞壁由肽聚糖组成，通常可以帮助区细菌的种，判断它们是阳性菌还是阴性菌。

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腐生葡萄球菌和其他阳性球菌，如链球菌和肠球菌这一化氢酶阴性的细菌。

Bacteria with no membrane, gram positive, retain the purple staining visible under a microscope.

无膜的阳性菌在显微镜下可见保留紫色染色。

In gram positive bacteria this layer forms part of the cell wall, so penicillin can easily attack it.

在阳性细菌中， 这一层构成了细胞壁的一部，因此青霉素能够轻易攻击它。

They have a cell wall which protects the bacteria, determines whether they are gram positive or gram negative bacteria and also helps maintain their shape.

保护细菌的细胞壁决定了细菌是阳性菌还是阴性菌，并且参与维持细菌的形状。

When doing a Gram stain, Clostridium tetani stains purple— or gram positive— and it's a bacillus, meaning that it looks like a big cylinder or rod under the microscope.

染色中，破伤风梭菌显紫色（染色阳性），呈棒状：显微镜下外观像一个巨大的圆柱体或棒子。