Contact angle measurement and cell hydrophobicity of granular sludge from upflow anaerobic sludge bed reactors.

Applied and Environmental Microbiology
D DaffonchioW Verstraete

Abstract

The contact angle, which is generally used to evaluate the hydrophobicities of pure bacterial strains and solid surfaces, was used to study mixed cell cultures of bacteria involved in anaerobic digestion. Previously published data and data from this study showed that most acidogens are hydrophilic (contact angle, <45(deg)) but most of the acetogens and methanogens isolated from granular sludge are hydrophobic (contact angle, >45(deg)). The hydrophobicities of mixtures of hydrophilic and hydrophobic cells were found to be linearly correlated with the cell mixing ratio. The hydrophobicities of cells present in effluents from upflow anaerobic sludge bed reactors which were treating different types of substrates were different depending on the reactor conditions. When the reactor liquid had a high surface tension, cells sloughing off from sludge granules, as well as cells present on the outer surfaces of the granules, were hydrophobic. Short-term batch enrichment cultures revealed that proteins selected for highly hydrophilic cells. Long-term in-reactor enrichment cultures revealed that sugars selected for hydrophilic acidogens on the surfaces of the granules, while fatty acids tended to enrich for hydrophobic methanogens. When lin...Continue Reading

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Citations

May 1, 1996·World Journal of Microbiology & Biotechnology·W VerstraeteP Lens
Jun 14, 2019·Applied Microbiology and Biotechnology·Kazuki FujinawaKazuya Watanabe
Sep 1, 2009·Microbial Biotechnology·M Madalena AlvesAlfons J M Stams
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Jan 17, 2017·Applied Microbiology and Biotechnology·Yuyan ZhangKaiming Peng
Mar 15, 2019·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Samuel C Uzoechi, Nehal I Abu-Lail
Jun 18, 2020·Materials·Dominika Czerwińska-GłówkaKatarzyna Krukiewicz
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Mar 25, 2009·Applied Microbiology and Biotechnology·Pieter Van den AbbeeleTom Van de Wiele
Mar 17, 2020·Frontiers in Microbiology·Maria Cristina GaglianoCaroline M Plugge
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Dec 4, 2020·Microorganisms·Carsten NachtigallDoris Jaros
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