Affiliation:
1. Research Service, Veterans Administration Hospital, Albany, New York 12208
2. Biology Department, Rensselaer Polytechnic Institute, Troy, New York 12180
Abstract
Unlike
Escherichia coli, Bacillus cereus
T appears to accumulate Mg
2+
in its cell sap against a concentration gradient. Over a range of Mg
2+
in the growth medium from 5 × 10
−5
to 1.35 × 10
−2
m
, the concentration of Mg
2+
in the cell sap of
B. cereus
T was maintained at about 6 × 10
−3
m
, and ribosome-bound Mg
2+
and spermidine, as well as the spermidine concentration in the cell sap, appear to be unaffected by the concentration of Mg
2+
in the growth medium. Inhibition of growth of
E. coli
by streptomycin is progressively reversed by increasing the concentration of Mg
2+
in the growth medium above 5 m
m
. The finding that similar increases of Mg
2+
in the growth medium did not reverse the inhibition of
B. cereus
T is also consistent with the conclusion that
B. cereus
T, unlike
E. coli
, accumulates Mg
2+
to a constant concentration in its cell sap.
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
Cited by
12 articles.
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