Successive Nonstatistical and Statistical Approaches for the Improved Antibiotic Activity of Rare Actinomycete Nonomuraea sp. JAJ18

Table 1

Low and high levels of each variable used in Plackett-Burman design.

Variables	Medium components	+ values (g/L)	− values (g/L)
	Starch	20	2.0
	(NH4)2SO4	4	0.4
	Yeast extract	8	0.8
	NaCl	10	1.0
	MgSO4·7H2O	2	0.2
	K2HPO4	2	0.2
	CaCO3	4	0.4
	FeSO4·7H2O	0.004	0.0004