microtubules
(mi"kro-tu\'buls)
Small cylinders, about 25 nm in diameter, made of tubulin proteins and present in the cytoplasmic matrix and flagella of eucaryotic cells; they are involved in cell structure and movement.

Microbiology. . 2009.

Look at other dictionaries:

  • Microtubules — Microtubule Les microtubules sont des fibres constitutives du cytosquelette, au même titre que les microfilaments d actine et que les filaments intermédiaires. Ils ont un diamètre d environ 25 nm et une longueur variable du fait de leur dynamique …   Wikipédia en Français

  • microtubules — n. pl. [Gr. mikros, small; L. tubulus, small water pipe] Minute tubules in cells that are often cross linked; found in cilia, spindle fibers, and in the cytoplasm where they form the cytoskeleton …   Dictionary of invertebrate zoology

  • microtubules — n. thin tube like organ in a cell that is used for transporting material within a cell …   English contemporary dictionary

  • doublet microtubules — Microtubules of the axoneme. The outer nine sets are often referred to as doublet microtubules, although only one (the A tubule) is complete and has 13 protofilaments. The B tubule has only 10 or 11 protofilaments, and shares the remainder with… …   Dictionary of molecular biology

  • interpolar microtubules — microtubules of the mitotic spindle whose minus ends terminate near the pole and whose plus ends extend beyond the chromosomes so that they interdigitate with microtubules extending from the opposite pole. Called also polar m s …   Medical dictionary

  • astral microtubules — microtubules that radiate outward from the mitotic spindle pole, forming the aster; they interact with the cellular cortex to orient the spindle in the cell …   Medical dictionary

  • kinetochore microtubules — microtubules of the mitotic spindle, organized into bundles (kinetochore fibers), that attach to the kinetochore, oriented so that their plus ends are embedded in the kinetochore and their minus ends are at or near the spindle pole …   Medical dictionary

  • Astral microtubules — are a subpopulation of microtubules, which only exist during and immediately before mitosis. They emanate from centrosomes, but are not associated with kinetochores. They are organized into radial arrays around the centrosomes. The turn over rate …   Wikipedia

  • subpellicular microtubules — the microtubules (24 to 26) radiating posteriorly from the polar rings, directly beneath the pellicle, forming part of the apical complex in certain protozoa …   Medical dictionary

  • polar microtubules — interpolar m s …   Medical dictionary

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