Table 2
Compar ison of antimicrobial activity of Oenothera biennis obtained by different extraction methods

Samples1)	Gram’s positive		Gram’s negative
	Bacillus cereus	Staphylococcus aureus	Escherichia coli	Salmonella typhimurium
SE	++2)	-	-	-
USE	++	-	-	-
RE	++	-	-	-
AE	++	-	-	-
LE	++	-	-	-

SE, stirrer extraction; USE, ultrasonification extraction; RE, reflex extraction; AE,autoclave extraction; LE, low temperature high pressure extraction.
+, 8~10 mm; ++, 10~12 mm; +++, above 12 mm; -, negative.