Table 1.

Doubling times and rRNA/protein ratios of Δ7 prn cells expressing E. coli or hybrid ribosomes

rRNA-producing plasmid	rRNA species		Doubling time, min	rRNA/protein ratio, relative value
	16S	23S
pSTL102	Ec	Ec	47.9 ± 1.5	1.00 ± 0.02
pSt1-Km	St	St	52.6 ± 2.4	0.99 ± 0.02
pPM2	Pv	Pv	55.6 ± 1.1	0.97 ± 0.02
pWM1	Ec	Ec/yeast	61.8 ± 1.6	0.93 ± 0.05

Ec, E. coli; St, S. typhimurium; Pv, P. vulgaris; Ec/yeast, E. coli/yeast hybrid.