MeSH definition : A genus of gram-negative, aerobic, spherical cells usually occurring in pairs. The
resting stage is considered a cyst. (From Bergey's Manual of Determinative Bacteriology,
9th ed);
A genus of gram-negative, aerobic, spherical cells usually occurring in pairs. The
resting stage is considered a cyst. (From Bergey's Manual of Determinative Bacteriology,
9th ed)