aster

(redirected from Asters)
Also found in: Dictionary, Thesaurus, Encyclopedia.

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 ?
To prevent asters losing their shape, pinch out the outside shoots of the aster when they are about 6in tall to produce a dome-shaped plant.
Aster x frikartii Huge clumps of tall, woody stems branch to form enormous mushrooms of vivid purple, pink, crimson and white flowers with sumptuous golden centres, each many-petalled daisy with its own shaggy, green ruff.
Asters should also be sprayed at the same time as roses because powdery mildews are found on the plant surface and are easily targeted.
All asters do well in sun or light shade in reasonable soil, but need to be kept well watered in dry soils.
There are other beautiful species of asters which are unaffected by mildew.
Most of our asters have a central disk of florets that maximize cross-pollination.
Or send cheques/POs, payable to Eastfields Nursery, to: People Asters Offer, Eastfields Nursery, Rookery Farm, Holbeach St Johns, Spalding, PE12 8SG.
These asters make excellent backdrops for larger flowers in bouquets, but we also like letting them shine on their own--toward the fronts of borders or in small, densely planted beds.
- The amount of pollen available to pollinators was quantified in both yellow and red disk asters. For 10 flowers of each color, 10 anthers were removed from disk florets and placed in microcentrifuge tubes with 10 ml basic fuchsin in solution to stain the pollen for viewing with a light microscope (Kearns and Inouye, 1993).