aster

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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

(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.
References in periodicals archive ?
ASTER monch is the best blue Michaelmas daisy. It has long-lasting flowers with orange centres that appear when the days shorten.
Those to leave tend to be late-flowering kinds, including agapanthus, asters the Michaelmas daisy types, chrysanthemums, delphiniums, day lilies and hostas.
Byline: The Journal's environment editor, a man who knows his mimulus from his Michaelmas daisy.
There are also dwarf, spreading forms for the rockery and Michaelmas daisy types for the herbaceous border.
Borage, Lobelia, Viola, Salvia Patens, Nigella, Ageratum, Nemophila, Centaurea, Brachycome, Felicia, Anchusa, Delphinium, Geranium, Gentian, Michaelmas Daisy. BULBS: Agapanthus, Allium.