Oxygen Profiles in, and in the Agar Beneath, Colonies of Bacillus Cereus, Staphylococcus Albus and Escherichia Coli

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Abstract
This paper reports the use of microelectrodes to measure O2 penetration in different aged colonies of Bacillus cereus, Escherichia coli and Staphylococcus albus. In young (18 h) colonies of B. cereus and E. coli O2 disappeared at depths of 25-30 .mu.m and 35-40 .mu.m respectively. In young S. albus colonies, O2 reached a minimum but was never completely absent. As colonies aged (24-168 h) the depth to which O2 penetrated increased.

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