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Definition of a biofilm

Robert J. Palmer Jr. rjpalmer at utkux.utcc.utk.edu
Thu Jul 29 01:20:22 EST 1999

A resounding second of this motion...
The best definition of "what is a biofilm" is the expression of a "biofilm
phenotype" - so maybe we ought to start defining that...
 >Dear all,
 >I think that two things must be taken into consideration:
 >1) Bacterial cells(how much ?) accumulated to form a colony or a film
 >inside (or not) an organic matrix.
 >2) Physiological expression of characters which would be characterictic of
 >bacteria living in biofilm.
 >A lot of knowledge is accumulated on morphology of biofilms. Knowledge
 >about physiology is not sufficient. Actually, who is able to show that
 >there are physiological differences between bacteria OF THE SAME AGE in
 >stationnary phase of growth(planctonic cells) and in biofilms. Recent
 >studies of my lab show (on Listeria monocytogenes and E coli O157 H7) that
 >the same resistance to desinfection (for example)is observed.
 >We need physiological studies to specify the biofilm phenotype if it exists
 >and when it is expressed during growth. Definition would have to take into
 >account morphological aspects of bacteria expressing the phenotype.
 >J. Labadie.
 >Jean Labadie
 >Directeur Adjoint SRV
 >(Deputy Director Meat Research Laboratory).
 >U R Microbiologie
 >INRA de Theix
 >63122 St Genes Champanelle
 >tel 04 73 62 41 57
 >Fax 04 73 62 42 68

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