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• W2488705529 abstract "The size of the area or territory which encompasses the amoebae that enter into an aggregate of a cellular slime mold is related to the process of initiation of aggregation as well as the size of the sorocarp. Each territory represents one aggregation and therefore one initiation event, and the size of any one fruiting body, or sorocarp, is primarily determined by the number of amoebae that enter an aggregation center. It is true that some of the cells may divide after the beginning of aggregation (Wilson, 1952; Bonner, 1960) but since all intake of food ceases some time before aggregation, there is no increase in bulk during the morphogenetic phases of the life-cycle, that is, while the aggregated cell mass progressively becomes transformed into a fruiting body. It will be shown that regardless of the density of the amoebae, the territory size, under controlled environmental conditions, remains constant for any one species. This means that sorocarp size is largely controlled by cell density and that the problem of initiation is identical with the problem of the establishment of these rigid aggregation territories. A simple method was used for the control of the amoeba density within a culture by controlling, in turn, the amount of bacterial food supply. Two per cent Bacto agar containing 6.2 tug./ml. of dihydrostreptomycin sulphate (Lilly) was poured into plastic Petri dishes which were marked on the bottom surface with squares of .102 cm2. A few loopfuls of Escherichia coli taken from a stock culture (grown on 1% dextrose, 1%o peptone, 2% Bacto agar) were placed in 2 to 7 ml. of sterile distilled water. The density of the suspension was then determined in a Bausch & Lomb Spectrometer 20 at 550 m/l. Appropriate dilutions were made to achieve a particular density and .09 ml. of this final suspension was evenly spread (with the help of an electric turntable and a sterile, bent glass rod) on the surface of one of the streptomycin agar Petri plates. In this way it was possible to obtain a range in food supply on the plates from approximately 500,000 bacterial cells/mm.2 (= an optical density of 6.0) to 5000 bacterial cells/mm.2 (= an optical density of 0.1). The spores of the slime mold were inoculated in three marked spots on each plate with a very fine, glass needle" @default.
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• W2488705529 date "1962-02-01" @default.
• W2488705529 modified "2023-09-26" @default.
• W2488705529 title "AGGREGATION TERRITORIES IN THE CELLULAR SLIME MOLDS" @default.
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• W2488705529 doi "https://doi.org/10.2307/1539317" @default.
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