Figure 1. Surface response for lipase activity obtained by mutant Aspergillus niger as a function of the variables nitrogen concentration and volume of ammonium sulfate solution

From

Lipase Production by Aspergillus niger 11T53A14 in Wheat Bran Using Experimental Design Methodology

Regiane Ribeiro dos Santos, Lívia Nolasco Macedo Muruci, Mônica Caramez Triches Damaso, Janine Passos Lima da Silva, Lucielen Oliveira Santos

Journal of Food and Nutrition Research. 2014, 2(10), 659-663 doi:10.12691/jfnr-2-10-1