| Comments |
"An apparent excess of ribosomes in ultramicrobacteria (cell
volume=0.09µm^3) has also been observed in the parasite
Rickettsia prowazekii (29). The rickettsiae have a generation
time of about 10 h (µ=0.07 cell/hour) when growing in the
cytoplasms of their eucaryotic hosts. Their low rate of growth
correlates well with a low number of ribosomes (1,500 per
cell). However, the cellular concentration is 17,000 per µm^3 (Table
3) (30)." Sphingomonas sp. strain RB2256, E. coli, Rickettsia prowazekii |