Faculty of Biology, University of Latvia
EEB
Hard copy: ISSN 1691–8088
On-line: ISSN 2255–9582
Env Exp Biol (2012) 10: 77–80
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Environmental and
Experimental
Biology

Env Exp Biol (2012) 10: 77–80

Original Article

Factors influencing adhesion of Pseudomonas putida on porous clay ceramic granules

Vizma Nikolajeva1*, Tatjana Griba2, Zaiga Petriņa2
1Department of Microbiology and Biotechnology, Faculty of Biology, University of Latvia, Kronvalda Bulv. 4, Riga LV–1586, Latvia
2Institute of Microbiology and Biotechnology, University of Latvia, Kronvalda Bulv. 4, Riga LV–1586, Latvia
*Corresponding author, E-mail: vizma.nikolajeva@lu.lv

Abstract

The aim of the study was to determine factors affecting adhesion of bacteria Pseudomonas putida on porous clay ceramic granules. The number of colony-forming units (CFU) of P. putida on Devonian clay granules sintered at temperature of 1100°C after 4-h-long incubation was estimated. The level of the adhesion significantly (P < 0.05) depended on temperature, pH value, ionic strength of the medium and initial bacterial concentration. The optimum pH for bacterial adhesion was about pH 6. Temperature of 30°C was more appropriate for the adhesion than temperature of 20°C. Negative correlation was observed between the number of adhered bacteria and ionic strength (r = –0.84) in the medium and between the number of bacterial CFU in the suspension and ionic strength (r = –0.77) in the medium over the range from 0 to 200 mM NaCl. Investigated concentrations of bacterial suspension up to 11 log CFU mL–1 did not reach saturation of bacteria on the surface of granules. The adhesion intensity appears to be sufficient for subsequent development of bacterial colonies in adequate environmental conditions.

Key words: adhesion, Pseudomonas putida, porous clay ceramic granules

 
Env Exp Biol (2012) 10: 77–80
 DOI: http://doi.org/10.22364/eeb
EEB

Editor-in-Chief
Prof. Gederts Ievinsh



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University of Latvia

 
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