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.
The coded and actual values of experimental variables used in the central composite design (CCD).
| Independent Variables | Symbols | Levels | ||||
|---|---|---|---|---|---|---|
| −1.68 * | −1 | 0 | 1 | 1.68 * | ||
| Temperature (°C) | X 1 | 17.8 | 23.8 | 32.5 | 41.3 | 47.2 |
| pH | X 2 | 4.5 | 5.5 | 7.0 | 8.5 | 9.5 |
| [NaCl]% (w/v) | X 3 | 5.15 | 9.75 | 16.50 | 23.25 | 27.85 |
* Alpha values used for axial points in this study.
