TABLE 4.

Stability within CVD 908-htrA of ori15A replicons, containing plasmid maintenance systems of increasing complexity, grown without selection and in the presence of increasing osmolarity^a

Strain or plasmid	Stability result with NaCl concn:
	50 mM			150 mM			300 mM
	OD600b	% Fluorescing bacteria	Mean fluorescence intensityc	OD600	% Fluorescing bacteria	Mean fluorescence intensityc	OD600	% Fluorescing bacteria	Mean fluorescence intensityc
Strain
CVD 908-htrA	0.98	100	0.6	1.11	100	0.6	1.12	100	0.6
Plasmids
pGEN91	1.00	13.2	28.6	1.17	11.4	42.9	1.26	10.9	65.5
pGEN111	1.26	47.4	51.8	1.17	28.9	93.6	1.12	42.4	65.1
pGEN121	1.01	80.5	53.3	1.20	73.8	74.0	1.15	56.7	105.3
pGEN193	1.11	71.4	50.9	1.24	65.2	64.7	1.22	53.7	90.8
pGEN222	1.01	96.8	52.1	1.28	93.3	67.8	1.13	95.3	89.2

^aThese data are represented by histograms in Fig. 2. 

^bOD₆₀₀, optical density at 600 nm. 

^cAll standard error values are <0.6.