Milani P, Palladini G. doxycycline pronunciation Importantly, concentrations of doxycycline below 30 Ојg ml could be used to manipulate the degree of hygromycin resistance; at 5 Ојg ml and 2 Ојg ml of doxycycline, the radial growth rate of the organism was reduced by 68 and 55, respectively data not shown.