TABLE 5.

Subpopulations in a mixture of three bacterial cultures according to biomass and DNA content^a

Culture	Subpopulationb	Population (106 cells/ ml)	Cell mass (pg/cell)		Biomass (μg/liter)		DNA content (fg/cell)
			Dryc	Wetd	Drye	Wetf
C. oligotrophus	Total	0.484	0.042	0.234	20.2	113.2	5.0
	1 n	0.191	0.027	0.151	5.2	28.8	3.2
	2 n	0.173	0.040	0.223	7.0	38.6	5.8
	3 n	0.015	0.073	0.408	1.1	6.1	8.9
	C phase	0.074	0.032	0.179	2.4	13.2	4.2
Marinobacter sp. strain T2	Total	0.434	0.172	0.896	74.6	388.8	4.1
E. coli	Total	0.492	0.497	1.74	244.5	856.1	8.7
	1 n	0.117	0.368	1.29	43.1	150.9	5.4
	2 n	0.263	0.488	1.71	128.3	449.7	10.2
	3 n	0.010	0.688	2.41	6.9	24.1	14.9
	4 n	0.014	0.811	2.84	11.4	39.8	20.6
	Dim	0.048	0.500	1.75	24.0	84.0	1.7

^aMixture of C. oligotrophus, Marinobacter sp. strain T2, and E. coli, as shown in Fig. 4. 

^bTotal includes all cells from a region; n indicates the number of chromosomes per cell; C phase indicates cells undergoing chromosome replication; Dim indicates cells with very low fluorescence. The sum of values for the subpopulations is >91% the total for all organisms in regions electronically bounded as shown. 

^cFrom flow cytometry as shown in Fig. 2, with corrections for E. coli in M9 medium. 

^dDry mass divided by (X_dry/X_wet) (Table 4; 17.9% for C. oligotrophus). 

^ePopulation density × dry mass per cell. 

^fPopulation density × wet mass per cell.