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What does CFF stand for?

CFF stands for cell-free filtrates

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a heat-stable toxin present in the intact bacterial cell but not in cell-free filtrates of cultures of intact bacteria. It is the lipopolysaccharide (LPS) of gram-negative outer membranes. Also called O antigen. It is pyrogenic and increases capillary permeability through stimulation of tumor necrosis factor alpha release.
a heat-stable toxin present in the intact bacterial cell but not in cell-free filtrates of cultures of intact bacteria. It is the lipopolysaccharide (LPS) of gram-negative outer membranes. Also called O antigen. It is pyrogenic and increases capillary permeability through stimulation of tumor necrosis factor alpha release.
was obtained by alcohol precipitation from the supernatant fraction of centrifuged cell suspensions. This material induced curling and deformation of clover (Trifolium fragiferum) root hairs in a manner characteristic of that previously shown to be induced by rhizobia and cell-free filtrates. The extent of deformation was proportional to the concentration of the crude polysaccharide in the plant growth medium.
Moreover, the use of more than one LAB bacteriocin as a combination of biopreservative may have major applications in improving food safety [1]. In the present study, the inhibitory effect of the cell-free filtrates of each of the 20 isolates was evaluated. Antimicrobial activity was observed for 6 isolates, and only against Gram positive bacteria. The biochemical nature of the antibacterial molecule produced by S.