Free-living cells produced colonies more rapidly than particle-associated ones when a pure culture of Desulfovibrio desulfuricans containing sediment particles was inoculated on an agar medium. The time required for the appearance of the first colony, trof the first order reation model  was 53 h for free-living cells and 112 h for particle-associated ones. The value of trmay be determined from the growth rate and sulfate reduction activity because the activity of free-living cells was much higher than that of aggregating ones. © 1990.
Fukui, M., & Takii, S. (1990). Colony formation of free-living and particle-associated sulfate-reducing bacteria. FEMS Microbiology Letters, 73(1), 85–89. https://doi.org/10.1016/0378-1097(90)90727-8