51问答网 > 大肠杆菌和金黄色葡萄球菌分离纯化实验报告

大肠杆菌和金黄色葡萄球菌分离纯化实验报告

2025-03-15 07:30:09
推荐回答（1个）
回答1：

金黄色葡萄球菌呈圆形
,表面光滑、凸起、湿润
,直径
2
3mm
.灰黑色至黑色
,有光泽
,常有浅色
(
非白色
)
的边缘
,周围绕以不透明圈
(
沉淀
),其外常有一清晰带
(
卵磷脂环
)
.当用接种针触及菌落时具有黄油样粘稠感.有时可见到不分解脂肪的菌株
,除没有不透明圈和清晰带外
,其他外观基本相同.从长期贮存的冷冻或脱水食品中分离的菌落
,其黑色常较典型菌落浅些
,且外观可能较粗糙
,质地较干燥.
大肠杆菌为两端钝圆的短小杆菌,一般约0.5-0.8μm*1.0-3.0
μm,多单独存在或成双,但不呈长链排列.约50%的菌株有周生鞭毛,但多数只有1-4根,一般不超过10根,故菌体动力弱.多数菌株有菌毛,有的有荚膜或微荚膜,不形成芽孢,对普通碱性染料着色良好,革兰氏染色阴性.

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