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Coaggregation between Acinetobacter johnsonii S35 and Microbacterium esteraromaticum strains isolated from sewage
Anushree Malik1, Masashi Sakamoto, Taishiro Ono
1Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya 321-8585, Japan.
Journal of Bioscience and Bioengineering
|October 20, 2005
Summary
This study investigated bacterial coaggregation in sludge, finding that proteins on one bacterium interact with carbohydrates on another. This interaction is crucial for non-flocculating sludge bacteria to aggregate.
Area of Science:
- Microbiology
- Environmental Science
- Biotechnology
Background:
- Sludge bacteria play a critical role in wastewater treatment processes.
- Understanding intergeneric coaggregation is vital for optimizing sludge settleability and treatment efficiency.
Purpose of the Study:
- To investigate the mechanisms of intergeneric coaggregation between non-flocculating sludge bacteria.
- To identify the surface components involved in the coaggregation process.
Main Methods:
- Examined coaggregation between Acinetobacter johnsonii S35 and Microbacterium esteraromaticum strains.
- Assessed the impact of electrolyte concentration, EDTA, and proteases (Actinase E) on coaggregation.
- Investigated the effect of surface pretreatment with Actinase E and periodate.
Main Results:
- Electrolyte concentration had minimal impact on the aggregation index (A.I.).
- EDTA and Actinase E significantly reduced A.I. by 35-58%, indicating involvement of divalent cations and proteins.
- Pretreatment experiments suggested a protein-carbohydrate interaction mechanism.
Conclusions:
- Coaggregation between these non-flocculating sludge bacteria involves surface proteins interacting with carbohydrate moieties.
- This protein-carbohydrate interaction is a key factor in the formation of bacterial aggregates in sludge environments.