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 ?
Eisenstein, "An invertible element of DNA controls phase variation of type 1 fimbriae of Escherichia coli," Proceedings of the National Acadamy of Sciences of the United States of America, vol.
Recently it has been found that ribonucleic acid (RNA) polymerase, sigma S(RpoS), a sigma factor, influences type 1 fimbriae gene expression.13
Fimbriae are filamentous appendices, naturally localized on the bacterial surface, and are commonly responsible for mediating adhesion to the host cells and can promote specific binding to the receptors on surface of host cells [19].
While omental wrapping of the line is one main cause of catheter malfunctioning (Xie, Ren, Kiryluk, & Chen, 2010), only anecdotal cases of peritoneal catheter obstruction by tubaric fimbriae are described in the literature (Abidin, Spector, & Kittur, 1990; Macallister & Morgan, 1993; Moreiras-Plaza & Caceres-Alvarado, 2004; Sinha & Dastidar, 2011; Uchiyama, Fujikawa, Suga, & Naito, 2001), none of them involving adult patients with complex malformative syndrome.
The denticles (fimbriae) forming the echinate border were increasingly longer on cells further from the base and closer to the apex, with denticles from cells in the middle region of a scale exceeding lengths of 10 [micro]m (Fig.
Pasteurella multocida (type D and type A) and atrophic rhinitis of pigs hemagglutination fimbriae and adhesion in vitro to nasal mucosa of neonatal pigs (in German).
In the present study, biofilm inhibition by coumarins was partially elucidated as being caused by the repressions of curli genes and motility genes by coumarin and by umbelliferone, and resultant reductions in fimbriae production (Fig.
nucleatum's byproducts of lipopolysaccharide, fimbriae, proteinases and at least five different short-chain fatty acids (SCFA): butyric acid, isobutryic acid, isovaleric acid, propionic acid and acetic acid.
Pili which are also known as fimbriae have been detected in Gram-positive bacteria [13-15].