from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The part of a cell nucleus that remains less colored than the rest of the nucleus when stained or dyed.
from The Century Dictionary.
- noun In botany, that portion of the basic substance of the nucleus of a vegetable-cell which, under the action of staining agents, becomes less highly colored than the rest.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Biol.) Tissue which is not stained by fluid dyes.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biology Tissue which is not stained by fluid dyes.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the part of a cell nucleus that is relatively uncolored by stains or dyes
from The American Heritage® Dictionary of the English Language, 4th Edition
Researches, chiefly due to Flemming, have shown that the nucleus in very many tissues of higher plants and animals consists of a capsule containing a plasma of "achromatin," not deeply stained by re-agents, ramifying in which is a reticulum of "chromatin" consisting of fibres which readily take a deep stain.
They are: the chromatin, or coloured nuclear substance, which has a peculiar property of tingeing itself deeply with certain colouring matters (carmine, haematoxylin, etc.), and the achromin (or linin, or achromatin), a colourless nuclear substance that lacks this property.
Now the two groups diverge, and in many cases a striated appearance of the achromatin substance between the two groups of chromatin loops is observable (H).
In some cases (especially egg-cells) this striated arrangement of the achromatin is then termed a "nucleus-spindle," and the group of chromatin loops (G, _a_) is known as "the equatorial plate."
In G the chromatin fibres are marked _a_, and correspond to the "equatorial plate"; _b_, achromatin fibres forming the nucleus-spindle; _c_, granules of the cell-protoplasm forming a "polar star."
Each of the attraction-spheres has divided into two, which are joined by fibres of achromatin, and connected with the periphery of the cell in the same way as in the original or parent sphere, III.]