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Effects of a Quaternary Amine on the Activity of Fresh Water Sediment Communities Measured as Changes in Thermal Power
No. 36, Ecotoxicology: Proceedings of the Third Oikos Conference Held 30 November: 2 December, 1982, in Copenhagen, Denmark (1984), pp. 130-134
Published by: Oikos Editorial Office
Stable URL: http://www.jstor.org/stable/20112915
Page Count: 5
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The total activity of a natural sediment decomposition community can be measured with microcalorimetric techniques. The power-time curves for samples affected by Aliquat 336, compared with control samples, revealed an initial inhibition followed by a marked activation. It is suggested that the activation partly results from an increased amount of easily metabolizable substrates liberated from the cells by Aliquat-provoked injury of the cell membrane. In a study of the effects of Aliquat on bacterial cellulolysis by a Cellulomonas sp., the utilization of cellulose, a glucose polymer, was more affected than that of the glucose monomer at the same concentration of Aliquat. As mere bacteria adhered to cellulose fibre and the affinity for cellulose was higher in the presence of Aliquat it is suggested that an Aliquat-"shell" surrounds the bacterium as an enzyme barrier. In natural sediment samples a similar effect as in the Cellulomonas study was obtained when soluble and solid substrates, respectively, were added to samples affected by Aliquat.
Ecological Bulletins © 1984 Oikos Editorial Office