abscission

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ab·scis·sion

(ab-si'shŭn), Avoid the mispronunciation ab-si'zhŭn.
Cutting away.
[L. ab-scindo, pp. -scissus, to cut away from]
Farlex Partner Medical Dictionary © Farlex 2012

abscission

(ăb-sĭzh′ən)
n.
The act of cutting off.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

abscission

An antiquated term for cutting; in modern medicine it has been replaced by the term excision, see there.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

ab·scis·sion

(ab-sish'ŭn)
Cutting away.
[L. ab-scindo, pp. -scissus, to cut away from]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

abscission

The act of cutting off.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
Abscissionclick for a larger image
Fig. 4 Abscission . Abscission layer in a leafstalk.

abscission

the process by which plant organs are shed. This process occurs in the stalks of unfertilized flowers, in ripe fruits and in the base of the petiole of deciduous leaves in autumn, or in diseased leaves at any time. It is due to the formation of an abscission layer of thin-walled cells in the stalk base which rupture under strain produced by e.g. wind. A layer of cork forms beneath the abscission layer to seal the plant surface. Abscission is controlled by plant hormones present: a low concentration of AUXIN, high amounts of ETHYLENE, and (in some plants) a high concentration of ABSCISIC ACID all stimulate production of the abscission layer.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

ab·scis·sion

(ab-sĭ'zhŭn)
Cutting away.
[L. ab-scindo, pp. -scissus, to cut away from]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
lanatus exhibit a form of serotiny (canopy seed storage) in that the cones do not disintegrate, but gradually dry out, retaining the partially exposed abscised seeds within the desiccated cone (Grobbelaar, 1989, 2004).
Recently abscised buckthorn leaves have a relatively low C:N ratio (e.g., 19.6 - 20.6 for leaf litter collected in WI; Miller, 2010), largely due to high concentrations of nitrogen in the leaves (Knight et al., 2007; Heneghan et al., 2002, 2006).
Dimensions: Abscised part of clitellate lectotype >70 mm long, 10 mm wide at 10, 14 mm in region of tubercula pubertatis.
"The levels of heavy metals in abscised leaves are also raised, and they are clearly there to be excreted rather than stored," The Telegraph quoted Ford as saying.
This symptom makes it difficult to use old (>1 year old) foliage in carbon distribution studies, unless the amount of foliar biomass abscised has been measured.
After the indicated interval of time the explants were temporarily removed from the chamber and petioles that fell off with a gentle touch were recorded as abscised. To check for ethylene-induced chlorosis in healthy recently expanded trifoliate leaves, excised leaves were placed on moist paper towels in a dark chamber at 23[degrees]C, the air was brought to 10 [micro]L [L.sup.-1] ethylene by injection with a known amount of pure ethylene, and leaves were then visually checked for signs of chlorosis at the indicated number of days after start of the ethylene treatment.
During the present study, these two forms occur notably as abscised pinnules, very rarely as ultimate pinnae of which three were collected.