flagellum


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flagellum

 [flah-jel´um] (pl. flagel´la) (L.)
a long, mobile, whiplike appendage arising from a basal body at the surface of a cell, serving as a locomotor organelle; in eukaryotic cells, flagella contain nine pairs of microtubules arrayed around a central pair; in bacteria, they contain tightly wound strands of flagellin.

fla·gel·lum

, pl.

fla·gel·la

(flă-jel'ŭm, -ă),
A whiplike locomotory organelle of constant structural arrangement consisting of nine double peripheral microtubules and two single central microtubules; it arises from a deeply staining basal granule, often connected to the nucleus by a fiber, the rhizoplast. Although characteristic of the protozoan class Mastigophora, comparable structures are commonly found in many other groups, for example, in sperm.
[L. dim. of flagrum, a whip]

flagellum

(flə-jĕl′əm)
n. pl. fla·gella (-jĕl′ə)
A long, whiplike appendage that functions as a cellular organ of locomotion, found in certain bacteria, protozoans, and specialized eukaryotic cells such as motile sperm.

fla·gel·lum

, pl. flagella (flă-jel'ŭm, -ă)
A whiplike locomotory organelle of constant structural arrangement consisting of nine double peripheral microtubules and two single central microtubules; it arises from a deeply staining basal granule, often connected to the nucleus by a fiber, the rhizoplast.
[L. dim. of flagrum, a whip]

flagellum

A long, whip-like, filamentary process used for locomotion and present on a number of PROTOZOA and other organism, especially the class Mastigophora that includes Trichomonas vaginalis , a common cause of vaginal discharge, and Trypanosma species that cause TRYPANOSOMIASIS.

flagellum

(pl. flagella) a fine, hair-like process of a cell, associated with locomotion in unicellular organisms. The eukaryotic flagellum is similar in structure to the CILIUM; however, it can be distinguished from cilia by its occurrence in smaller numbers and by generally being longer. The prokaryotic flagellum has a simpler structure, consisting of a filament made out of protein subunits called flagellin, arranged in several chains to form a helix around a hollow core. The filament is anchored through a rotating hook and a basal body to the bacterial cell membrane and cell wall. The number of flagella may vary from one to many, depending on the bacterial species. flagella occur in the flagellates, in most motile gametes, in ZOOSPORES, in BACTERIA and occasionally in METAZOANS, as in the ENDODERM of some COELENTERATES.

fla·gel·lum

, pl. flagella (flă-jel'ŭm, -ă)
Whiplike locomotory organelle of constant structural arrangement consisting of nine double peripheral microtubules and two single central microtubules.
[L. dim. of flagrum, a whip]
References in periodicals archive ?
Antennal flagellum weakly crenulate on posterior surface, without deep concavity between flagellomeres; mandible distinctly broad apically; posterior hypostomal carina with strong tooth; protibial spur with apex long, about three-fourths of malus length, with a distinct row of 10 elongate branches (not including apical portion of rachis); S3-S4 with distal margins gently convex; S5 with midapical row of spines straight, not medially projecting (Ecuador: Napo).
Four of these clades are represented by adult male specimens, and the morphological details of the flagellum (shape and setal positions) were sufficiently distinct from each other to warrant their recognition as different species.
Each flagellum contains a high number of segments, or annuli, that provide the entire organ with the necessary articulation for flexibility.
The intracellular concentration of [Ca.sup.2+] in activated sperm flagella is approximately [10.sup.-8]M; (17) thus, two types of microtubule sliding must work in a sperm flagellum: the sliding of a long, thick fiber (synchronous sliding) and that of short, thin fibers (metachronal sliding).
Groups 1 2 Age (days) 180 360 180 360 Acrosome anomalies 13.64 12.50 -- -- (inflated acrosome), % of ill-defined cells Flagellum middle 9.09 12.50 13.33 -- part deviations and a droplet on the flagellum, % of ill-defined cells The loop form of 31.82 31.25 26.67 36.36 the flagellum end, % of ill-defined cells An uneven contour 18.18 18.75 26.67 27.27 of the middle part, % of ill-defined cells With a cytoplasmic 31.82 31.25 26.67 36.36 droplet on the flagellum, % of ill-defined cells The number of 89.00 92.00 92.50 94.50 morphologically normal sperms, % TZI 1.82 1.75 1.47 1.27
Harshey, "Sensing wetness: a new role for the bacterial flagellum," EMBO Journal, vol.
One free flagellum (AF) was 14.6 +- 0.57 u m long and anteriorly directed.
In 1458, the Dominican inquisitor Nicolas Jacquier wrote the Flagellum haereticorum fascinariorum (The Scourge of Heretical Bewitchers).
The cake was jointly developed by Euglena Co., a venture firm specializing in the study of the organism with a single flagellum at the University of Tokyo, and Soke Kutsuwado, a confectioner based in Takamatsu, Kagawa Prefecture.