Abstract
Bacillus subtilis and Escherichia coli K12 (both transformed for human leukocyte interferon production) and Escherichia coli B/r and Sporotrichum thermophile (a deuteromycete) were cultivated in submersed culture and the culture fluorescence recorded on-line using a fluorometer. During the cultivation of B. subtilis the signal from the fluorometer correlated with cell density and interferon production and thus could be used for process control (interferon production). However, the culture fluorescence of the other organisms did not increase ( S. thermophile), was too weak to be measured with the fluorometer used ( E. coli transformed for interferon production), or the signal from the fluorometer was not an accurate measure of the culture fluorescence because of the accumulation of a fluorophor in the culture medium ( E. coli B/r).
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