Gram-Negative Aerobic Rods and Cocci

**Definition:** A group of gram-negative bacteria consisting of rod- and coccus-shaped cells. They are both aerobic (able to grow under an air atmosphere) and microaerophilic (grow better in low concentrations of oxygen) under nitrogen-fixing conditions but, when supplied with a source of fixed nitrogen, they grow as aerobes.

**Tree numbers:** - B03.440.400.425

**Synonyms:** - Gram Negative Aerobic Rods and Cocci