Ethanol stimulates the flocculation of Zymomonas mobilis |
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| Authors: | M.A.P.F. Palha C.E. Lopes N. Pereira Jr. |
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| Affiliation: | (1) Departamento de Engenharia Química, Universidade Federal de Pernambuco, Cidade Universitaria, Recife PE, Brazil, CEP: 50670-901;(2) Departamento de Antibióticos, Universidade Federal de Pernambuco, Pernambuco, Brazil, CEP: 50670-901;(3) Departamento de Engenharia Bioquímica, Universidade Federal do Rio de Janeiro, Janeiro, Brazil, CEP: 21910-900 |
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| Abstract: | When flocculating cells of Zymomonas mobilis were put in contact with increasing concentrations of ethanol, flocculation was intensified. The settling velocity increased 5.3-fold when the ethanol concentration rose from 0 to 12% v/v. Additionally, the percentage of free-cells diminished considerably (from 33 to 10%), denoting an increase on the extent of flocculation. The stress provoked by ethanol possibly leads to the activation of genes responsible for aggregation. |
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