1. [TA] SYN: hair (1). 2. A fine filamentous appendage, somewhat analogous to the flagelium, that occurs on some bacteria. Pili consist only of protein and are shorter, straighter, and much more numerous and may be chemically similar to flagella; specialized pili (F pili, I pili, and other conjugative pili) seem to mediate bacterial conjugation. SYN: fimbria (2). SEE ALSO: conjugative plasmid. [L.]
- pili annulati SYN: ringed hair.
- F pili p. (2).
- F p. a structure responsible for attachment of individual male (F+) to female (F) bacteria, forming conjugal pairs.
- I pili p. (2).
- pili multigemini the presence of several hairs in a single follicle.
- R pili specialized pili found on bacterial cells, similar to F pili and associated with R plasmids.
- pili torti a condition in which many hair shafts are twisted on the long axis, congenital or acquired as a result of distortion of the follicles from a scarring inflammatory process, mechanical stress, or cicatrizing alopecia; the hair shafts resemble spangles in reflected light, are brittle, and break at varying lengths with many areas appearing bald with a dark stubble; as a developmental defect it can be manifested in such syndromes as Bjornstad, Crandall, and Menkes. SYN: twisted hairs.

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pi·lus 'pī-ləs n, pl pi·li -.lī a hair or a structure (as on the surface of a bacterial cell) resembling a hair

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a hair. See also pili.

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pi·lus (piґləs) gen. and pl. piґli [L.] 1. hair. 2. in microbiology, one of the minute filamentous appendages of certain bacteria; they are considerably smaller and less rigid than flagella and are associated with antigenic properties and sex functions of the cell; called also fimbria.

Medical dictionary. 2011.

Look at other dictionaries:

  • Pilus — Saltar a navegación, búsqueda Esquema de la conjugación bacteriana. 1 La célula donante genera un pilus. 2 El pilus se une a la célula receptora y ambas células se aproximan. 3 El plásmido móvil se desarma y una de las cadenas de ADN es… …   Wikipedia Español

  • PILUS — a PELLE cuiinhaeret, ana Graeco πίλος, de quo supra, an a πτίλον, i. e. pluma, an a φύλλον, folium etc. vilitate suâ in proverbium abiit, apud Latinos, Pili non facio, Cicer, ad Fratrem, et Graecos, Α῎ξιος τριχὸς, dignus pilô, inhominem nihili,… …   Hofmann J. Lexicon universale

  • Pilus — (ou fimbriae, pluriel pili) : Appendice se situant à la surface de la paroi de nombreuses bactéries à Gram négatif (et exceptionnellement des bactéries à Gram positif), plus courts et plus fins que des flagelles, ils peuvent également être… …   Wikipédia en Français

  • pilus — pilus. См. пилус. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • pilus — pilus. = fimbria (см.). (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Pilus [1] — Pilus (lat.), Haar …   Pierer's Universal-Lexikon

  • Pilus [2] — Pilus (röm. Ant.), Compagnie der Triarier; daher Primipilus, die erste Compagnie u. der erste Centurio derselben …   Pierer's Universal-Lexikon

  • Pilus — (lat.), Haar (s. Haare) …   Meyers Großes Konversations-Lexikon

  • pilus — [pī′ləs] n. pl. pili [pī′lī΄] a hair or hairlike structure …   English World dictionary

  • Pilus — Pili bei E. coli. Der Pilus (von lateinisch pilus „Haar, Faser“, Plural: Pili, auch Fimbrien genannt) ist ein bei Prokaryoten vorkommendes, außerhalb der Zelle als Zellfortsatz befindliches, fadenförmiges, aus einem Protein bestehendes Anhängsel …   Deutsch Wikipedia

  • Pilus — Schematic drawing of bacterial conjugation. 1 Donor cell produces pilus. 2 Pilus attaches to recipient cell, brings the two cells together. 3 The mobile plasmid is nicked and a single strand of DNA is then transferred to the recipient cell. 4… …   Wikipedia

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