Dictionary » S » Shear



1. To cut, clip, or sever anything from with shears or a like instrument; as, to shear sheep; to shear cloth.

It is especially applied to the cutting of wool from sheep or their skins, and the nap from cloth.

2. To separate or sever with shears or a similar instrument; to cut off; to clip (something) from a surface; as, to shear a fleece. Before the golden tresses . . . Were shorn away. (Shak)

3. To reap, as grain.

4. To deprive of property; to fleece.

5. (Science: mechanics) To produce a change of shape in by a shear. See Shear.

Origin: Sheared or Shore; Sheared or Shorn; Shearing] [OE. Sheren, scheren, to shear, cut, shave, AS. Sceran, scieran, scyran; akin to D. & G. Scheren, Icel. Skera, Dan. Skire, Gr. Cf. Jeer, Score, Shard, Share, Sheer to turn aside.

1. A pair of shears; now always used in the plural, but formerly also in the singular. See Shears. On his head came razor none, nor shear. (Chaucer) Short of the wool, and naked from the shear. (Dryden)

2. A shearing; used in designating the age of sheep. After the second shearing, he is a two-sher ram; . . . at the expiration of another year, he is a three-shear ram; the name always taking its date from the time of shearing. (Youatt)

3. (Science: engineering) An action, resulting from applied forces, which tends to cause two contiguous parts of a body to slide relatively to each other in a direction parallel to their plane of contact; also called shearing [[s 9d0 tress]], and tangential stress.

4. (Science: mechanics) A strain, or change of shape, of an elastic body, consisting of an extension in one direction, an equal compression in a perpendicular direction, with an unchanged magnitude in the third direction. Shear blade, one of the blades of shears or a shearing machine. Shear hulk. See Hulk. Shear steel, a steel suitable for shears, scythes, and other cutting instruments, prepared from fagots of blistered steel by repeated heating, rolling, and tilting, to increase its malleability and fineness of texture.

Origin: AS. Sceara. See Shear.

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Need your help on these biology topics please:(

... cell model? 3)Some main facts about the proteins in endothelial cell(mainly considering Rac and Rho) 4)Facts on fluid flow in endothelial cell? 5)Shear stress in endothelial cells due to fluid flow(eg when blood flows) 6) Any information on Rac1 activation in endothelial cells due to fluid flow ...

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by kajas2624
Sun Dec 18, 2011 12:19 pm
Forum: General Discussion
Topic: Need your help on these biology topics please:(
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Views: 4742


To shear it in small and relatively constant fragment before say cloning. You can also use a fine needle or a nebulizer. it is cheaper and less sequence specific than restriction enzyme, with break point that should be entirely ...

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by canalon
Thu Nov 18, 2010 1:56 pm
Forum: Molecular Biology
Replies: 5
Views: 6599

Electron Transport Chain

... I believe there is some kind of energy cost to transporting them into the mitochondria. I assume it all somehow balances out in the end, given the shear number of metabolic pathways all tied into this. ;) [EDIT -- cut from above] However, you then use another H2O (-1) going from Succinyl-CoA to ...

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by mamoru
Mon Mar 15, 2010 12:47 pm
Forum: Molecular Biology
Topic: Electron Transport Chain
Replies: 3
Views: 6151

Smeary restriction digest of genomic DNA

... complete with low molecular weight bands indicative of histonal DNA. I'm pretty sure it's more due to nuclease contamination than mechanical shearing, though there may some shear as well. The original preps were also run on the gel, and look fine for all samples. Because the same reagents ...

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by icequeen11
Tue May 22, 2007 7:43 pm
Forum: Molecular Biology
Topic: Smeary restriction digest of genomic DNA
Replies: 1
Views: 1886


It has to do with the amount and shear size of he parent molecule. The primers are small and present in way over abundance. The parent molecule is huge compared to the primer (and all basepairs have to match up). I recall that the textbook ...

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by Vagabond
Wed Feb 28, 2007 12:51 pm
Forum: Genetics
Topic: PCR
Replies: 9
Views: 4115
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