Table 1.

Factors and their levels in the uniform design.

Factors	Level of Factors
X1 inoculation size (%)	1	2	4	8
X2 cultivation temperature (°C)	20	28	36
X3 cultivation time (d)	2	6	10
X4 pH of medium	6	7	8	9	10
X5 content of seawater (%)	0	20	40	60	80	100
X6 yeast extract (g/L)	1	2	3	4	5	6	7	8
X7 maltose (g/L)	2	4	8	10	12	14	16	20
X8 glucose (g/L)	1	2	4	8	12