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. 2017 Apr 18;14:47–53. doi: 10.1016/j.btre.2017.04.001

Table 2.

The five studied variables and their levels.

Levels Variables
Nitrogen Source (%v/v) pH Inoculum size (cell/ml) Incubation period (Days) Temperature (°C)
High Level (+1) 1 9 ∼109 6 28
Low Level (-1) 0 6 ∼106 3 22