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Quantification, Viability Assessment, and Visualization Strategies for Acinetobacter Biofilms
Published on: August 4, 2023
Intergeneric coaggregation of non-flocculating Acinetobacter spp. isolates with other sludge-constituting bacteria
Kimchhayarasy Phuong1, Kazuo Kakii, Toshiyuki Nikata
1Department of Material Science and Engineering, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Japan.
Journal of Bioscience and Bioengineering
|April 1, 2009
Summary
Non-flocculating Acinetobacter species coaggregate with other sewage sludge bacteria. Hydrophobic interactions are key drivers of this intergeneric coaggregation, influencing bacterial community structure in wastewater treatment.
Area of Science:
- Microbiology
- Environmental Science
- Biotechnology
Background:
- Wastewater treatment relies on microbial communities, where bacterial aggregation influences efficiency.
- Acinetobacter species are common in sewage sludge but their aggregation behavior is not fully understood.
- Understanding intergeneric coaggregation is crucial for optimizing sludge processes.
Purpose of the Study:
- To investigate the coaggregation potential of non-flocculating Acinetobacter isolates with other sewage sludge bacteria.
- To determine the role of cell surface hydrophobicity in Acinetobacter coaggregation.
- To identify bacterial partners involved in coaggregation with Acinetobacter.
Main Methods:
- Spectrophotometric assay to quantify coaggregation between Acinetobacter isolates and other bacterial strains.
- Sequencing of 16S rRNA genes for bacterial identification.
- Microbial Adhesion to Hydrocarbon (MATH) assay to measure relative cell surface hydrophobicity (RCSH).
Main Results:
- Acinetobacter johnsonii S35 and Acinetobacter junii S33 showed significant coaggregation with multiple bacterial strains.
- Coaggregation ability correlated positively with the relative cell surface hydrophobicity (RCSH) of the partner strains.
- Hydrophilic Acinetobacter mutants exhibited no coaggregation, confirming the role of hydrophobicity.
Conclusions:
- Hydrophobic interactions are critical for the intergeneric coaggregation of Acinetobacter species with other sludge bacteria.
- This finding has implications for understanding and manipulating microbial consortia in wastewater treatment.
- Cell surface properties significantly influence bacterial community dynamics in sewage sludge environments.
