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.

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.

cleavage

/cleav·age/ (klēv´ij)
1. division into distinct parts.
2. the early successive splitting of a zygote into smaller cells (blastomeres) by mitosis.

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.

cleavage

[klē′vij]
Etymology: AS, cleofan, to split
1 the series of repeated mitotic cell divisions that occur in an ovum immediately after fertilization. It transforms the single-celled zygote into a multicellular embryo capable of growth and differentiation. During cleavage, the embryo remains uniform in size as its cells, or blastomeres, become smaller with each division. Kinds of cleavage include determinate cleavage, equal cleavage, indeterminate cleavage, partial cleavage, total cleavage, and unequal cleavage.
2 the act or process of splitting, primarily a complex molecule into two or more simpler molecules. cleave, v.

cleavage

Embryology
The mitotic divisions of a zygote (fertilised egg) to form a blastomere (cleavage cells).
 
Vox populi
The act of splitting or cleaving.

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

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.
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.

cleavage

1. division into distinct parts, e.g. the double helix.
2. the early successive splitting of a fertilized ovum into smaller cells (blastomeres) by mitosis. See also holoblastic, meroblastic.

cleavage site
the places on a strand of DNA where the restriction enzyme cleaves the DNA.
References in periodicals archive ?
Cleavage Therapy(TM) is done under local anesthesia, so patients have little or no downtime before they can enjoy more ample cleavage," says Dr.
In fact, 35% would choose to wear the lowest level of cleavage enhancement on a first date, perhaps concerned with looking like they are trying too hard.
Results for each peptide are expressed as percent cleavage by furin compared with the canonical sequence.
Hypothesis 1: In countries where the vast majority of the population shares the same national and religious identity, religion is less likely to be an important cleavage and religious conflict less likely to take place.
Earlier this year, one of America's most popular TV shows, The Ellen DeGeneres Show, presented the anti-wrinkle bra as the cure for wrinkles in your cleavage.
Often called “builder's bum,” buttock cleavage is usually due to ill-fitting trousers and careless bending over.
the lowdown Remember the golden rule - legs OR cleavage.
Ian Paterson left a small amount of breast tissue around the cleavage on some patients for cosmetic reasons.
As follows from our previous data (10), O-glycosylation of the threonine 71 residue, located close to the proBNP cleavage site, has a pronounced suppressive effect on the processing efficiency and should be considered when studying proBNP processing (Fig.
Currently, if there is a questionable cleavage matter in the junior high, the offending student will be pulled aside and the topic will be privately and delicately dealt with, she said.
BEFORE AND AFTER: Images promoting curvy actress Kelly Brook''s new play which had to be changed because the buns covering her cleavage were deemed too small
The second cleavage crenulates and transposes the first, which typically carries a slicken lineation where lithons are deformed by crenulation.