【摘要】 从六份城市生活污水样品中，分离筛选出一菌株，具如下主要特征：杆菌，0．85～1．2×2．0～5．0μm；革兰氏染色阴性；具衣鞘，细胞包在鞘里，丝状体很长，但无分枝；亚端生鞭毛；胞内具PHB颗粒和异染颗粒；液化明胶微弱；菌落为光滑型和丝状两种。经鉴定该菌株为浮游球衣细菌（Sphaerotilusnatans）。该菌在28℃条件下生长良好，细菌细胞大，PHB颗粒很大，有的可以充满整个细胞。经培养的菌种于培养液中在室温下保存近一年，方法简便效果好。更多还原

【Abstract】 A Strain of sphaerotilus natans from six polluted water sampleswas isolated. The strain has some main features as followst bacillus, 0.85~1.2 ×2.0~ 5.0μm; Gramnegahve bacteria; it has sheath that cells in it,the hypha is vare long but no divaricahon; subterminal--flagellum; there are metachromatic granules and PHB granules in cells; there are two kind of colony, the one is smooth, and the other is silk The strain can grow properly Under condition 28℃ and produce big PHB granules.The strain was kept in cultivating liquid under home temperature near to a year, this is a good and handy way.更多还原