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Table 2 Comparison of results obtained for the tryptophan model with different methods. All the results that violate the lower bound for X3 were reproduced with GP by relaxing such bound. Constraint violations are shown in boldface.

From: Optimization of biotechnological systems through geometric programming

    iterative Modified   
  basal IOM IOM IOM GP SQP
X 1 0.18465 1.198 |X1|0 1.198 |X1|0 1.198 |X1|0 1.199 |X1|0 1.2 |X1|0
X 2 7.9868 1.071 |X2|0 1.095 |X2|0 1.055 |X2|0 1.148 |X2|0 1.180 |X2|0
X 3 1418 0.347 |X3|0 0.465 |X3|0 0.273 |X3|0 0.8 |X3|0 0.825 |X3|0
X 4 0.00312 0.0058 0.0053 0.062 0.00414 0.0035
X 5 5 4 4 4 4 4
X 6 2283 5000 5000 5000 5000 2384
X 7 430 1000 1000 1000 1000 1000
V trp 1.310 4.26 |V trp |0 3.884 |V trp |0 4.54 |V trp |0 3.062 |V trp |0 2.61 |V trp |0