cleavage

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cleavage

 [klēv´ij]
1. division into distinct parts.
2. the early successive splitting of a fertilized ovum (zygote) into smaller cells (blastomeres) by mitosis.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

cleav·age

(klēv'ij),
1.
See also: cleavage division.
See also: Langer lines, tension lines. Synonym(s): intermammary cleft
2. Series of mitotic cell divisions occurring in the oocyte immediately following its fertilization.
See also: cleavage division.
See also: Langer lines, tension lines. Synonym(s): segmentation (2)
3. Splitting of a complex molecule into two or more simpler molecules.
See also: Langer lines, tension lines. Synonym(s): scission (2)
4. Linear clefts in the skin indicating extrinsic stresses being applied in that area.
See also: Langer lines, tension lines.
5. The tendency of a crystal to break along a preferred direction or plane.
Farlex Partner Medical Dictionary © Farlex 2012

cleavage

(klē′vĭj)
n.
1. Embryology
a. The series of mitotic cell divisions that produces a blastula from a fertilized ovum. It is the basis of the multicellularity of complex organisms. Also called segmentation.
b. Any single cell division in such a series.
2. Chemistry The splitting of a complex molecule, such as a polysaccharide, into simpler molecules.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

cleavage

Embryology
The mitotic divisions of a zygote (fertilised egg) to form a blastomere (cleavage cells).
 
Vox populi
The act of splitting or cleaving.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

cleav·age

(klēv'ăj)
1. Series of mitotic cell divisions occurring in the oocyte immediately after its fertilization.
See also: cleavage division
2. Splitting of a complex molecule into two or more simpler molecules.
Synonym(s): scission (2) .
3. Linear clefts in the skin indicating the direction of the fibers in the dermis.
See also: cleavage lines
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

cleavage

1. The process of splitting, especially the repeated stages of cell division that produce a BLASTULA from an ovum that has been fertilized by a spermatozoon.
2. The breaking down of a complex molecule into smaller parts.
3. The vertical furrow between a woman's breasts visible when low-cut garments are worn.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
Cleavageclick for a larger image
Fig. 109 Cleavage . Radial and spiral cleavage.

cleavage

the division of the cytoplasm during nuclear division (see MEIOSIS, MITOSIS following FERTILIZATION of the egg to form the ZYGOTE. Holoblastic cleavage occurs in animals where there is little yolk, and here the entire zygote is involved; meroblastic cleavage occurs where the yolky part of the zygote fails to divide, only part of the zygote undergoing cleavage. BILATERAL CLEAVAGE gives rise to a bilaterally symmetrical arrangement of blastomeres, as opposed to spiral cleavage which gives rise to a spiral arrangement of blastomeres. Bilateral cleavage occurs in chordates, echinoderms and a few smaller groups, indicating their common origins whereas most other invertebrate phyla have spiral cleavage.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
To evaluate the percentage of cleaved PS vs total PS, we quantified the two molecular forms of PS in the pool vs calibration curves constructed, respectively, by adding purified PS and purified FXa-cleaved PS to PS-depleted plasma (Diagnostica Stago).
Plasma samples from 87 patients with a history of VTE and from 174 controls were analyzed for cleaved PS, total PS, free PS evaluated by ELISA and ELSA, and PS APC cofactor activity.
Cleaved PS was measured (11) with a homemade ELISA based on a mAb (mAb 5A5G2) specific for cleaved PS.
The follicles were composed of a monotonous population of small cleaved cells similar to the follicular lymphoma diagnosed 13 years previously.
The combination of 2 different types of NHL composed of small cleaved cell lymphoma and diffuse large cell lymphoma is the most common variant, accounting for up to 58% of cases.[3] Composite lymphomas, composed of HD and one of the components of NHL, are very rare.
In composite lymphomas of HD and NHL, the least described variant of NHL is follicular small cleaved cell lymphoma.
Third, the incorporation of oxidizing agents in the coolant which would reoxidize the cleaved sulfur-sulfur bonds, is a possibility.
The envelope protein, called gp160, is normally cleaved into two pieces during virual replication inside white blood cells.
The hemagglutinins of viral strains whose infectivity was not activated by the bacterial enzyme were not cleaved by the bacterial enzyme.
Seed proteins are often made out of components cleaved from a precursor molecule.