Table 1.

Number of origins and origin foci per cell, and the period of colocalization under various growth conditions

Medium	Td (min)	Average number of origins per cell, O	Average number of origin foci per cell, F	Origins per origin focus, O/F	Period of colocalizationa, P (min)	Period of colocalizationa, as a percentage of Td (%)
LB	33	6.2	2.5b	2.5	43	130
Glu-CAA	42	4.4	2.2b	2.0	42	100
Glu-thy	102	2.5	2.0b	1.3	33	32
Gly-aac	115c	2.0c	1.9c	1.1	8 (25c)	7 (20c)
aThe period of colocalization (P) was calculated from the relationship O/F=2P/Td.
bNumber of cells examined (N=403 in LB, N=77 in glu-CAA, N=59 in glu-thy).
cData obtained from Nielsen et al (2006). Numbers discussed by Nielsen et al (2006) are given in parenthesis.