granule

(redirected from Alpha granules)
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granule,

in astronomy: see photospherephotosphere,
luminous, apparently opaque layer of gases that forms the visible surface of the sun or any other star. The photosphere lies between the dense interior gases and the more attenuated gases of the chromosphere.
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granule

[′gran·yül]
(astronomy)
A convective cell in the solar photosphere, about 600 miles (1000 kilometers) in diameter.
(geology)
A somewhat rounded rock fragment ranging in diameter from 2 to 4 millimeters; larger than a coarse sand grain and smaller than a pebble.

granule

Geology a single rock fragment in gravel, smaller than a pebble but larger than a sand grain
References in periodicals archive ?
By electron microscopy, platelets are enlarged and alpha granules are not present; however, dense granules, mitochondria, and lysosomes appear normal.
Intracellular signaling processes lead to increased cytoplasmic calcium and then initiate a secretory release reaction, whereby products from the alpha granules (platelet factor 4, [beta]-thromboglobulin, thrombospondin, platelet-derived growth factor, fibrinogen, VWF) and dense granules (adenosine diphosphate [ADP], serotonin) are released into the surrounding milieu.
In addition, [alpha]-SPD (Gray platelet syndrome) has decreased alpha granules and is usually considered a macrothrombocytopenia.