Expression of RhlI could restore the production of several exoproducts such as elastase, pyocyanin, hemolysin and rhamnolipids, and both RhlI and RhlR are required for the full activation of the rhlABR and lasB promoters (Brint and Ohman, 1995; Ochsner and Reiser, 1995).
Bacterial cooperation may take the form of the excretion of "public goods": exoproducts such as virulence factors, exoenzymes or components of the matrix in biofilms, to yield significant benefit for individuals joining in the common effort of producing them.
In both P. aeruginosa PAO1 and P. fluorescens CHA0 the Gac/Rsm cascade regulates the expression of exoproducts such as HCN.
These data add to the small but growing body of literature [ 7, 17, 22– 24] suggesting that microbial exoproducts are important for social interactions in natural populations (but see Bozdag & Greig [ 25]).
Note that in these cocultures, TO was added at the time of inoculation, whereas TOB was added after 10 h to allow possible accumulation of some P. aeruginosa exoproducts such as HQNO and LasA.
As part of the quorum sensing machinery this regulatory system not only controls the expression of genes specifying exoproducts such as HCN, pyocyanin and elastase, but also upregulates the expression of the rhlI gene, which codes for the enzyme synthesizing the quorum sensing signal N-butanoyl-homoserine lactone [ 17, 18].
Presents microbial analyses, such as metagenomics.
Studying cheese rinds could provide insight into other microbial communities, such as those found on skin, the authors say.
Severe microbial infections, such as tuberculosis and MRSA, often require treatment with three (or more) drugs.
Microbial flocculants are mainly divided into three types according to their compositions [12]: (1) microbial cells such as some bacteria; (2) microbial cell extracts such as yeast cell wall glucan; and (3) microbial metabolites.
