Cystite formation of Arthrobacter ureafaciens NRIC 0157^T

Abstract

The cystite formation of Arthrobacter ureafaciens NRIC 0157^T was studied by the use of a newly designed CT medium composed of 2.0% D-glucose, 0.28% NH₄H₂PO₄, 0.136% K₂HPO₄, 0.136% KH₂PO₄, 0.0005% MgSO₄·7H₂O, and 0.0007% CaCl₂·2H₂O. Cystites are drumstick-shaped and oval cells and are larger than vegetative cells. Cystites are Gram-negative, whereas vegetative cells are Gram-positive by the KOH reaction. The concentration and ratio of K⁺ and Mg²⁺ in CT medium mainly affected the cystite formation. Cystites are considered aberrant forms produced by nutritional imbalance.