Table 3.

Effect of lactose and IPTG on enzyme activity

Inducer	C (mmol/L)	Enzyme activity (U/mg of recombinant bacterial cells)
		DUD		DAD		TAD		TUD
		PNPase	UPase	PNPase	TPase	PNPase	TPase	PNPase	UPase
IPTG	0.1	214	3641	520	5300	282	6637	227	3465
	0.3	209	3756	550	5498	289	6598	214	3562
	0.5	224	3710	536	5521	296	6600	205	3514
1.0	210	3512	521	5315	279	6614	220	3419
Lactose	0.1	27	291	30	288	25	331	26	318
	0.3	157	2456	488	3785	176	4987	143	2895
	0.5	221	3689	513	5477	279	6632	216	3531
1.0	207	3635	520	5410	281	6651	229	3499
None-inducer		26	287	29	295	27	299	23	311