pilus

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pilus

 [pi´lus] (L.)
1. hair. adj., adj pi´lial.
2. one of the minute filamentous appendages of certain bacteria associated with antigenic properties and sex functions of the cell. Called also fimbria. adj., adj pi´liate.
pi´li cunicula´ti a condition characterized by burrowing hairs.
F pilus in bacterial genetics, a hollow tubular pilus possessed by (male) F+ cells, the carrier of the F plasmid (fertility plasmid). It forms a connection with a (female) F cell in bacterial conjugation to allow the transfer of genetic material.
pi´li incarna´ti a condition characterized by ingrown hairs.
pi´li tor´ti a condition characterized by twisted hairs.

pi·lus

, pl.

pi·li

(pī'lŭs, pī'lī), [TA]
1.
See also: conjugative plasmid. Synonym(s): hair (1)
2. A fine filamentous appendage, somewhat analogous in function to the flagellum, which occurs on some bacteria. Although they can be chemically similar to flagella, pili consist only of protein and are shorter, straighter, and more numerous. Specialized pili (F pili, I pili, and other conjugative pili) seem to mediate bacterial conjugation and bacterial attachment to host cells during the infective process.
See also: conjugative plasmid. Synonym(s): fimbria (2)
[L.]

pilus

/pi·lus/ (pi´lus) pl. pi´li   [L.]
1. a hair.pi´lial
2. one of the minute filamentous appendages of certain bacteria, associated with antigenic properties of the cell surface.pi´liate

pi´li cunicula´ti  a condition characterized by burrowing hairs.
pi´li incarna´ti  a condition characterized by ingrown hairs.
pi´li tor´ti  a condition characterized by twisted hairs.

pilus

(pī′ləs)
n. pl. pi·li (-lī′)
A hair or hairlike structure, especially a proteinaceous structure projecting from the surface of a bacterium that is smaller than a flagellum and functions in DNA transfer during conjugation and, usually with other such structures, in adhesion.

pilus

[pē′ləs] pl. pili
Etymology: L, hair
1 a hair or hairlike structure.
2 (in microbiology) a fine filamentous appendage found on certain bacteria and similar to flagellum except that it is shorter, straighter, and found in greater quantities in the organism. Pili consist solely of protein and are associated with antigenic properties of the cell surface.

pi·lus

, pl. pili (pī'lŭs, -lī) [TA]
1. One of the fine, keratinized, filamentous epidermal growths arising from the skin of the body of mammals except the palms, soles, and flexor surfaces of the joints; the full length and texture of the hair varies markedly in different body sites.
2. A fine filamentous appendage, somewhat analogous to the flagellum, that occurs on some bacteria.
Synonym(s): fimbria (2) .
See also: conjugative plasmid
[L.]

pilus

a hair-like structure on the surface of bacteria which may be associated with bacterial CONJUGATION (the sex pilus) or with adhering bacteria to surfaces. See also FIMBRIA.

pilus

pl. pili [L.]
1. a hair.
2. fine, filamentous appendage found on the surface of many gram-negative bacteria, shorter, thinner and straighter than flagella. There are two kinds of pili: (a) a larger form that is hollow and found on male bacterial cells only; it is used in bacterial cell conjugation, and (b) a smaller form which is of major significance in adherence of bacterial cells to epithelial surfaces such as the intestinal mucosa or mammary gland epithelium. Antipilus antibody can provide protection against disease. Called also fimbria.

pilus cuniculatus
pl. pili cuniculati; burrowing hair.
pilus incarnatus
pl. pili incarnati; ingrown hair.
pilus lanei
wool fiber.
pilus tacti
tactile hairs about the lips, nostrils and eyes.
pilus tortus
pl. pili torti; twisted hair; see also pili torti.