A morphological observation of a fungal fermentation shows the following two contrasting patterns: 1) the mycelia forming aggregates called "pellets" aa fermentation progresses; and 2) the original mycelial broth remains "pulpy" per se. It is claimed by Takahashi et al. that even the same species of mycelia becomes either pellet or pulpy, depending on an inoculum condition of the fermentation. 1

SummaryFollowing previous work in which a mass and monoxenons culture of Vorticella microstoma had been snccessfully established (Water Res., 7 , 615 (1973)) another species of Ciliata, Colpidium campylum was subjected to continuous cultivation using Alcaligenes faecalis as the sole bacterial food and asparagine as the limiting substrate. This work was primarily undertaken to reveal the interaction and biological oscillation between these two types of organisms which simulate the ecological behavior of activated sludge.The fact that the bacteria tended to flocculate and/or deflocculate, depending on the protozoan population was incorporated into the rate equations to account for the oscillation in individual population density of the predator-prey system. The mathematical approach presented earlier by Canale and other workers for biological oscillation used a homogeneously mixed system ; while nonhomogeneity originating from flocculation and defloccrilation of the bacterial food was overlooked in the earlier pnblication.

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