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. 2012 Aug 7;3(3):187–194. doi: 10.1007/s13205-012-0082-4

Fig. 1.

Fig. 1

Three-dimensional response surface curve showing the effect of interactions of a pH and tryptone, b pH and l-tyrosine, c pH and CuSO4, d tryptone and l-tyrosine, e tryptone and CuSO4, fl-tyrosine and CuSO4