Dictionary » B » Barrels

Barrels

Barrel

1. A round vessel or cask, of greater length than breadth, and bulging in the middle, made of staves bound with hoops, and having flat ends or heads.

2. The quantity which constitutes a full barrel. This varies for different articles and also in different places for the same article, being regulated by custom or by law. A barrel of wine is 31 1/2 gallons; a barrel of flour is 196 pounds.

3. A solid drum, or a hollow cylinder or case; as, the barrel of a windlass; the barrel of a watch, within which the spring is coiled.

4. A metallic tube, as of a gun, from which a projectile is discharged.

5. A jar.

6. (Science: zoology) The hollow basal part of a feather.

(Science: anatomy) barrel bulk, the tympanum, or tympanic cavity. Barrel organ, an instrument for producing music by the action of a revolving cylinder. Barrel vault. See vault.

Origin: oe. Barel, f. Baril, prob. Fr. Barre bar. Cf. Barricade.


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Re: Why so few beta-sheet membrane proteins?

As I remember alpha helices slide past others and they're more convenient for signal transduction or transport...beta barrels are rigid structures...

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by zami'87.
Mon Feb 22, 2010 4:11 pm
 
Forum: Cell Biology
Topic: Why so few beta-sheet membrane proteins?
Replies: 3
Views: 2670

Why so few beta-sheet membrane proteins?

... there so few membrane proteins with beta-sheets? 99% seems to be alfa-helices And the few few that exists, why are they only very complicated beta-barrels? Why not like transmembrane alfa-helices but with beta-sheets /Thanks

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by poobear
Sat Feb 20, 2010 11:45 pm
 
Forum: Cell Biology
Topic: Why so few beta-sheet membrane proteins?
Replies: 3
Views: 2670

Re: can anyone help with a mosquito borne infection

... vector of Dengue is Aedies Egyptii (sp). This is an urban insect requiring still, predator free water as found in old tyres, plant pots, water barrels etc hence urban not rural. The dengue virus requires a large concentrated human population in order to replicate. So while in the Brasilian ...

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by ManfromManaus
Mon Feb 01, 2010 11:55 pm
 
Forum: General Discussion
Topic: can anyone help with a mosquito borne infection
Replies: 2
Views: 1584

A Monkey's Uncle

... pigeons were so numerous that flocks would literally darken the sky with their passing and their passing sometimes took days. It is reported that barrels of Passenger pigeon tongues, and only the tongues, were sent back to England in shipload quantities. By the time any alarm bells began to ring, ...

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by narrowstaircase
Wed Mar 14, 2007 3:46 am
 
Forum: Evolution
Topic: A Monkey's Uncle
Replies: 26
Views: 57293

A Monkey's Uncle

... pigeons were so numerous that flocks would literally darken the sky with their passing and their passing sometimes took days. It is reported that barrels of Passenger pigeon tongues, and only the tongues, were sent back to England in shipload quantities. By the time any alarm bells began to ring, ...

See entire post
by JDavidE
Sat Mar 10, 2007 9:39 pm
 
Forum: Evolution
Topic: A Monkey's Uncle
Replies: 26
Views: 57293
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