Zymomonas

**Definition:** A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria that is not known to be pathogenic for man, animals, or plants. Its organisms are spoilers for beers and ciders and in sweet English ciders they are the causative agents of a secondary fermentation known as cider sickness. The species Z. mobilis is used for experiments in molecular genetic studies.

**Tree numbers:** - B03.440.450.980 - B03.660.050.800.990