Fig. 2
From: A microbubble-sparged yeast propagation–fermentation process for bioethanol production
Mass transfer performance of the control and microbubble fermenters. Mass transfer (kLa) was determined using a dissolved O2 probe located at several positions of the fermenters at 35 °C in YPD medium. The data are the means and standard deviation (n = 3 for RB; for MB, n = 7 for the depths 1 and 6 cm, and n = 3 for 4 cm and n = 2 for 8 cm depth.). Open square represents the value that was calculated through interpolation (see text)