Selection of an adhesive phenotype of Streptococcus salivarius subsp. thermophilus for use in fixed-bed reactors |
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Authors: | A Ragout F Siñeriz R Kaul D Guoqiang B Mattiasson |
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Institution: | (1) PROIMI MIRCEN, Avenida Belgrano y Pasaje Caseros, 4000 San Miguel de Tucumán, Argentina, AR;(2) Cat. Microbiología Superior, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, S.M. De Tucuman, Argentina, AR;(3) Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, Box 124, S-221 00 Lund, Sweden. Fax: +46 46 222 47 13, SE |
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Abstract: | Streptococcus salivarius subsp. thermophilus was cultivated in a chemostat in order to obtain an adhesive phenotype of this strain. When the system was operated at low
dilution rates (D<0.2 h-1) for about 4 weeks, the strain formed a visible film on the surface of the culture vessel. The biofilm cells were not washed
out even when dilution rates were increased (D=6.9 h-1), and this resulted in a high biomass productivity (P=4.1 g l-1h-1). On the other hand, when the culture was grown at dilution rates faster than 0.2 h-1, only the free suspended cells were present in the culture broth, and were washed out at velocities of about 1.0 h-1. The biomass productivity was consequently lower (P=1.33 g l-1h-1) than in the previous case. The selected adhesive phenotype was grown on different glass beads and the possibility of lactate
fermentation in a continuous and semicontinuous mode was demonstrated.
Received: 16 August 1995/Received revision: 18 March 1996/Accepted: 25 March 1996 |
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