Isolement et propriétés de nouvelles bactéries appartenant au premier groupe morphologique du genre Bacillus et dont le DNA contient près de 55 mol% de guanine + cytosine

F. Pichinoty , M. Mandel
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Abstract

Ten endospore-forming, aerobic strains were isolated from pasteurized soil samples by enrichment at 32 °C in a minimal medium containing crotonate, phenylacetate or 2,3-butanediol as sole carbon and energy source. They are rods with a diameter greater than 1 μm, Gram variable, very motile, and peritrichous. The endospores are oval and non-deforming, thus placing the strains in the first morphological group of the genus Bacillus. Poly-β-hydroxybutyrate is not produced in appreciable quantities. The maximum growth temperature is between 48°C and 60°C. They neither ferment glucose nor use nitrate as an electron acceptor. The oxidase reaction is positive. They hydrolyze gelatin and “Tween 80”. All the strains use 23 compounds as sources of carbon and energy. Many characters vary from one strain to another. The average guanine + cytosine content of the DNA is 54.9 ± 1.4mol%. The 10 cultures described differ clearly from Bacillus megaterium and perhaps represent a large new mesophilic, thermotolerant, omnivorous species, sensu Stanier (1976).

芽孢杆菌属第一形态群新细菌的分离和特性,其DNA中含有近55 mol%的鸟嘌呤+胞嘧啶
从巴氏灭菌的土壤样品中分离出10株内生好氧菌株,在32°C的最低培养基中富集,培养基中含有巴氏酸盐、苯乙酸盐或2,3-丁二醇作为唯一的碳和能量来源。它们是直径大于1 μm的棒状物质,具有克变量,具有很强的运动性和腐蚀性。内孢子呈椭圆形且不变形,因此将菌株置于芽孢杆菌属的第一形态组。聚β-羟基丁酸酯的产量并不可观。最高生长温度在48℃~ 60℃之间。它们既不发酵葡萄糖,也不利用硝酸盐作为电子受体。氧化酶反应是阳性的。他们水解明胶和" Tween 80 "所有菌株都使用23种化合物作为碳和能量的来源。许多字符在不同的品系中都不同。DNA中鸟嘌呤+胞嘧啶的平均含量为54.9±1.4mol%。所描述的10种培养物与巨型芽孢杆菌明显不同,可能代表了一种新的大型中温、耐热、杂食性物种,sensu Stanier(1976)。
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