TABLE 2.

Physiological characteristics of C. oligotrophus and conventional isolates

Organism	% ln chromo-some cells (no. of cultures)	Mean dry mass ± SD (fg/cell)	Solids (% wet wt)	Density (g/cm3)a	Genome size (Mbp)	DNA (% dry wt)	No. of ribosomal operons	No. of membrane proteins/no. of cytoplasmic proteinsa
Cycloclasticus oligotrophus (RB1)	30–80 (10)	40.1 ± 8	16	1.07 ± 0.01	2.9	14	1	210/170
Marinobacter arcticus (Pseudomonas sp. strain T2)	65–85 (3)	52 ± 4	20	1.075 ± 0.00	4.1	11	2	300/290
Escherichia coli	65–85 (10)	352 ± 147	29	1.10 ± 0.005	4.7	2.2	7	860b

^a Values are means ± standard deviations. 

^b Total number of resolved proteins (56).