|
| Table 1. Levels of experiments variables. |
Symbol |
Parameters (unit) |
Levels |
||
|
|
-1 |
0 |
1 |
X1 |
DNA (µg/mL) |
0.5 |
1.75 |
3 |
X2 |
PEI (µg/mL) |
5 |
8.5 |
12 |
X3 |
Incubation time (min) |
3 |
11.5 |
20 |
|
|
|