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aster

 [as´ter]
a structure occurring in dividing cells, composed of microtubules radiating from a centrosome. The two asters are the poles of the spindle apparatus.
 Asters separating in prophase of mitosis. From Dorland's, 2000.

as·tro·sphere

(as'trō-sfēr),
A set of radiating microtubules extending outward from the cytocentrum and centrosphere of a dividing cell.
[G. astron, star, + sphaira, ball]

aster

/as·ter/ (as´ter) [L.] a system of microtubules arranged in starlike rays around each pair of centrioles during mitosis.
Enlarge picture
Asters separating in prophase of mitosis.

aster

(ăs′tər)
n.
Biology A star-shaped structure formed in the cytoplasm of an animal cell during mitosis, having raylike microtubules that surround the centrosome.

as·tro·sphere

(as'trō-sfēr)
A set of radiating microtubules extending outward from the cytocentrum and centrosphere of a dividing cell.
Synonym(s): aster, attraction sphere.
[G. astron, star, + sphaira, ball]
Asterclick for a larger image
Fig. 54 Aster . Generalized form.

aster

a group of blind-ending SPINDLE MICROTUBULES radiating out from the CENTRIOLES of dividing cells in lower plants and all animals. The aster function is uncertain, but does not seem to be concerned with spindle formation.

Aster

genus of selenium indicator plants in the family Asteraceae; preferentially accumulates selenium from the soil. Includes A. adscendens, A. coerulescens, A. commutatus, A. ericoides, A. glaucoides, A. laevis var. geyeri. See also xylorrhiza.

aster

a structure occurring in dividing cells, composed of microtubules radiating from a centrosome. The two asters are the poles of the mitotic spindle.
References in periodicals archive ?
The name aster comes from the Greek word for star, so we've got a star offer for you.
Like most asters, 'Cape God' and 'Little Car low' are easy to grow.
Aster 'Coombe Fishacre' is another attractive aster high on deportment and generally well-behaved, with appealing soft pink flowers featuring crimson centres.
Aster AS all other perennials seem to have faded, my lavender-blue Aster x frikartii 'Monch' have come into their own, bringing a welcome burst of colour with their daisy-like flowers with yellow centres.
Anyone growing tall asters - and the majority are three feet plus - in the more carefully tended areas of the garden such as the herbaceous border will always need to stake them.
The New England asters (Aster novae-angliae) seem to be immune to mildew which often attacks other types.
Most of the year asters are just a promise, just a nice clump of green foliage," he says.
Aster amellus, which also has a fine range of colours, is a neat, small plant, ideal for edging, or as a bedding display.
For tough-stemmed plants like asters, split the end of the stem before dipping it in boiling water.
The season is still epitomised for many by the much-maligned aster, a plant that seems to flourish everywhere and in all conditions, the commonest blue variety more often than not encased in a shroud of white powdery mildew.