Microthrix parvicella, a Filamentous Bacterium from Activated Sludge: Growth on Tween 80 as Carbon and Energy Source

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Abstract
M. parvicella, cultivated in a medium with Tween 80 and Casamino acids, utilized only the oleic acid moiety of Tween 80 as C and energy source. The cell yield from Tween 80 was .apprx. 0.32 g dry wt of cells/g of Tween 80 consumed. As only the oleic acid moiety of Tween 80 was utilized, the cell yield from oleic acid was 1.3 g dry wt of cells/g oleic acid consumed. The amount of C produced as CO2 was < 30% of the oleic acid-C and this low value was in agreement with the high cell yield. In batch culture M. parvicella stored large amounts of lipid material during the early growth phase. The fatty acids of the lipid globules were similar to the fatty acids supplied as C source. The percentage composition of the biomass changed to give C/N percentage ratios of about 15 during the early growth phase due to the high concentration of internal lipids and the low concentration of protein. The growth rate in batch culture was about 0.016 h-1 but was affected by the concentration of Casamino acids in the medium.

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