Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Factor levels of the 25−1 fractional experimental design used for the optimization of protease production by R. mucilaginosa CBMAI 1528 using different organic nitrogen sources.
| Variable | Symbol parameter | Level |
|
|---|---|---|---|
| Low (-1) | High (+1) | ||
| Casein tryptone (g/L) | X1 | 0 | 2.5 |
| Peptone from animal tissue (g/L) | X2 | 0 | 2.5 |
| Yeast extract (g/L) | X3 | 0 | 2.5 |
| Casamino acids (g/L) | X4 | 0 | 2.5 |
| Peptone from gelatin (g/L) | X5 | 0 | 2.5 |
