1887

Abstract

Summary: The physico-chemical cell-surface properties of Al and its adhesion to silicone rubber under flow were compared for cells suspended in phosphate-buffered saline (PBS) or PBS supplemented with 2% nutrient broth. Addition of 2% nutrient broth to cells suspended in PBS yields minimal growth and did not significantly change the mean zeta potential of the organisms, which was around -13 mV. However, a comparatively larger proportion of the organisms had more negative zeta potentials in the presen of nutrient broth. This change was concurrent with a slight decrease in cell-surface hydrophobicity, as measured by water contact angles, from 119° to around 112°. The initial deposition rate of AK1 to silicone rubber, as studied in a parallel plate flow chamber, increased from 344 cm s in the absence of nutrient broth to 505 cm s in its presence. No stationary level of adhesion was observed in the presence of nutrient broth, instead the number of adhering cells increased steadily at a rate of approximately 85 cm s. Fluorescent staining of adhering cells demonstrated that for adhesion from buffer only 2% of the adhering cells were metabolically active, whereas in case of deposition from PBS supplemented with nutrient broth, 67% of the adhering cells were metabolically active. It is concluded that the deposition rates measured in the parallel plate flow chamber with 2% nutrient broth added to the PBS suspension represent an interplay of adhesion and surface-associated growth.

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/content/journal/micro/10.1099/00221287-143-8-2569
1997-08-01
2019-11-21
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http://instance.metastore.ingenta.com/content/journal/micro/10.1099/00221287-143-8-2569
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