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

Inhibitory Effect of Tea (Camellia Sinensis (L.) O. Kuntze, Theaceae) Flower Extracts on Oleic Acid-Induced Hepatic Steatosis in Hepg2 Cells

Xinghai Zhang, Ying Gao, Jinwei Xu, Xiaohui Liu, Feng Jin, Bo Li, Youying Tu

Journal of Food and Nutrition Research. 2014, 2(10), 738-743 doi:10.12691/jfnr-2-10-13