1.
J Appl Bacteriol
; 48(3): 349-57, 1980 Jun.
Article
in English
| MEDLINE
| ID: mdl-6997255
2.
J Gen Microbiol
; 115(2): 325-31, 1979 Dec.
Article
in English
| MEDLINE
| ID: mdl-393801
ABSTRACT
The minimal nutritional requirements of Escherichia coli have been quantitatively determined in batch culture for cells with (R+) and without (R-) the R plasmid RP1. In these conditions R+ cells have a greater requirement than R- for several nutrients, particularly Mg2+, K+, Fe2+ and PO43-. The maximum growth rate in a simple salts medium was the same for R+ and R- cells. At low concentrations of phosphate, the specific growth rate of R+ cells differed from that found for R- cells. The R plasmid was stable in simple salts medium, irrespective of the nutrient ultimately depleted by growth, but, on storage, R+ cells survived for a shorter time than R- cells.