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Wiktionary
microtubule

n. small tubes made of protein and found in cells; part of the cytoskeleton.

WordNet
microtubule

n. a microscopically small tubule

Wikipedia
Microtubule

Microtubules (micro- + tube + -ule) are a component of the cytoskeleton, found throughout the cytoplasm. These tubular polymers of tubulin can grow as long as 50  micrometres and are highly dynamic. The outer diameter of a microtubule is about 24  nm while the inner diameter is about 12 nm. They are found in eukaryotic cells, as well as some bacteria, and are formed by the polymerization of a dimer of two globular proteins, alpha and beta tubulin.

Microtubules are very important in a number of cellular processes. They are involved in maintaining the structure of the cell and, together with microfilaments and intermediate filaments, they form the cytoskeleton. They also make up the internal structure of cilia and flagella.They provide platforms for intracellular transport and are involved in a variety of cellular processes, including the movement of secretory vesicles, organelles, and intracellular macromolecular assemblies (see entries for dynein and kinesin). They are also involved in chromosome separation ( mitosis and meiosis), and are the major constituents of mitotic spindles, which are used to pull apart eukaryotic chromosomes.

Microtubules are nucleated and organized by microtubule organizing centers (MTOCs), such as the centrosome found in the center of many animal cells or the basal bodies found in cilia and flagella, or the spindle pole bodies found in fungi.

There are many proteins that bind to microtubules, including the motor proteins kinesin and dynein, severing proteins like katanin, and other proteins important for regulating microtubule dynamics. Recently an actin-like protein has been found in a gram-positive bacterium Bacillus thuringiensis, which forms a microtubule-like structure and is involved in plasmid segregation.

Usage examples of "microtubule".

The fabric is a microtubule material that accommodates the flow of coolant throughout the suit.

The microtubules are actually full of a special kind of water, absolutely pure.

Lynn tried to remember what she knew about microtubules but felt tired.

Looked at in this way, I could be taken for a very large, motile colony of respiring bacteria, operating a complex system of nuclei, microtubules, and neurons for the pleasure and sustenance of their families, and running, at the moment, a typewriter.

Specifically, he and an anesthesiologist named Hameroff argue that quantum superposition of isolated electrons in the microtubules of brain cells creates the phenomenon of consciousness.

At the cellular level the morphogenetic field orders the crystallization of microtubules and other processes which are necessary for the coordination of cell division.

After her own presentation about microtubules in the brain, mystic input had come from a Sufi speaker.

In which case, my microtubules had about as much chance of exploiting quantum effects as I had of playing a game of squash with a version of myself from a parallel universe.

They came out of the egg transparent, so we could inspect them for fit and flaws, and except for the barely visible tracery of microtubules that carried coolant and such around them, they looked like an extra layer of skin.

In that finer-grained appraisal they had begun investigating the cytoskeletons of neuron cells, which were internal arrays of microtubules, with protein bridges between the microtubules.

At an extremely fine level of structure in the brain, much of one’s past was contained, encoded in a unique complex network of synapses, microtubules, dimers and vicinal water and amino-acid chains, all small enough and near enough together to have quantum effects on each other.

At an extremely fine level of structure in the brain, much of one's past was contained, encoded in a unique complex network of synapses, microtubules, dimers and vicinal water and amino-acid chains, all small enough and near enough together to have quantum effects on each other.

They are more like bundles of actin or myosin fibrils, surrounded by networks of macrotubules which transport cytoplasmic components, much as do microtubules in our familiar cellular structure.