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. 2001 Sep 4;98(19):10620–10623. doi: 10.1073/pnas.181341298

Table 3.

Decrease in ornithine decarboxylase activity after addition of spermidine to a Δspe1Δspe2 culture containing the pVT101U/SPE1 plasmid (Y465)

Specific activity*
No spermidine addition 3,200
1.5 hr after spermidine addition 1,900
3.3 hr after spermidine addition 1,900
*

nmol CO2 formed/hr/mg protein. 

 Y465 was grown in SD medium containing 10−9 M spermidine, as described in Materials and Methods. The doubling time in 10−9 M spermidine was approximately 5 hr. At zero time, spermidine was added to a final concentration of 10−4 M. Only a small increase in optical density was observed during the 3.3 hr after the spermidine addition.