Fimbria

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fimbria

[′fim·brē·ə]
(anatomy)

Fimbria

 

a long, thin, straight appendage of hydrophobic protein present in large numbers, sometimes as many as several thousand, on the cell surface of gram-negative bacteria. A fimbria measures as much as 12 micrometers in length and less than 100 angstroms in width. It is much finer and shorter than a flagellum. Male bacterial cells (donors) may have one to three sex fimbriae, or pili, that attach themselves to female cells (recipients) to form hollow bridges through which DNA may be transferred during bacterial conjugation. Fimbriae may be found in both motile and nonmotile bacteria. They usually originate from the basal granule in the cytoplasmatic membrane and pass to the exterior through the cell wall. Fimbriae enable a bacterial cell to adhere indiscriminately to solid surfaces of cells and tissues.

A. A. IMSHENETSKII

References in periodicals archive ?
coli is reduced after oral immunisation of pigs with a FedF and F4 fimbriae conjugate.
Transferrin associated with the porcine intestinal mucosa is a receptor specific for K88ab fimbriae of Escherichia coli.
The plasmid exhibits >99% identity with p55989 and encodes the aggregative adhesion fimbriae cluster that is a defining features of enteroaggregative E.
coli with type 1 fimbriae (mannose specific) and P fimbriae [specific for alpha-D-Gal(1-4)-beta-D-Gal], but had no effect on a diarrheal isolates expressing a CFA/I adhesin.
Inhibition of adhesion of enterotoxigenic Escherichia-coli-cells expressing F-17 fimbriae to small-intestinal mucus and brush-border membranes of young calves.
Further, biochemical studies have revealed that in addition to causing the fimbriae on the surface of the bacteria to become compressed, reducing their adhesion, the proanthocyanidins in cranberry may change the shape of the bacteria from rods to spheres and cause chemical changes to their surface membranes (Camesano, 2006).
The type 2 fimbriae also attach the bacteria to a carbohydrate receptor on white blood cells, which are found in pockets between teeth and the surrounding gum.
Genes for toxins, virulence factors, flagella and fimbriae have also been removed to seek to improve product purity and safety.
This reduction may be due to the ability of mannose in MOS to bind to mannose-binding lectins of Gram-negative bacteria expressing type 1 fimbriae, which consequently, reduces bacterial attachment to the intestinal epithelial cells (Ganner and Schatzmayr, 2012).
We will concentrate in viral receptors CD4 and bacterial fimbriae proteins (Fim).
The type-3 fimbriae cluster mrkABCDF was almost universally present, and plasmid-associated clusters pcoABCDERS (copper resistance) and silCERS (silver resistance) were widely distributed.