>
o
o
<
>
6 (A)
o
3
4
TIME (HR.) ;
IRTU(C)
4
5
6
TIME (HR.)
(B)
TIME (HR.)
Ί RTUFIG. 7. Time course plots of radiochemical recoveries
in C0
2 from metabolizing specifically labeled glucose.
(A) Zymomonas mobilis (formerly called Pseudomonas
lindneri). 1 RTU = 4 hours. (B) Acetobacter
suboxydans. 1 RTU = 4 hours. (C) Bacillus subtilis. 1 RTU
= 4.5 hours. In all systems, the following legends are
employed:
, glucose-1-C
14
;
, glucose-2C
14
;
, glucose-3,4-C
14
,
, glucose-4-C
14
,
—·—·—·—·—, glucose-6-C
14
. For the definition of the
relative time unit (RTU) see the text. Insets: cumulative recoveries of C
14
0
2 .
The rate of utilization of glucose has been shown
to be constant in microbial systems (165). Similar relations may not be realized in animal or plant tissue.