Writhe - определение. Что такое Writhe
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Что (кто) такое Writhe - определение

INVARIANT OF A KNOT DIAGRAM, BUT NOT OF KNOTS
Writhing number
  • A Type I [[Reidemeister move]] changes the ''writhe'' by 1
  • A simulation of an elastic rod relieving torsional stress by forming coils
Найдено результатов: 10
writhe         
I. v. a.
Twist, distort, contort, make awry.
II. v. n.
Wriggle, squirm, be distorted.
writhe         
[r???]
¦ verb twist or squirm in pain or as if in pain.
Origin
OE writhan 'make into coils, plait', of Gmc origin.
writhe         
v. (D; intr.) to writhe in (to writhe in pain)
writhe         
(writhes, writhing, writhed)
If you writhe, your body twists and turns violently backwards and forwards, usually because you are in great pain or discomfort.
He was writhing in agony...
The shark was writhing around wildly, trying to get free.
VERB: V, V adv/prep
Writhe         
·vi To twist or contort the body; to be distorted; as, to writhe with agony. Also used figuratively.
II. Writhe ·vt To Extort; to Wring; to Wrest.
III. Writhe ·vt To Wrest; to Distort; to Pervert.
IV. Writhe ·vt To Twist; to Turn; now, usually, to twist or turn so as to distort; to Wring.
Writhe         
In knot theory, there are several competing notions of the quantity writhe, or \operatorname{Wr}. In one sense, it is purely a property of an oriented link diagram and assumes integer values.
John Writhe         
ENGLISH DIPLOMAT
John Wrythe; John Wriothesley; Writhe, John
John Writhe (died 1504) was a long-serving English officer of arms. He was probably the son of William Writhe, who represented the borough of Cricklade in the Parliament of 1450–51, and is most remembered for being the first Garter King of Arms to preside over the College of Arms.
Writhing      
·p.pr. & ·vb.n. of Writhe.
Writhed      
·p.p. of Writhe.
II. Writhed ·Impf of Writhe.
DNA supercoil         
  • Supercoiled structure of circular DNA molecules with low writhe. The helical nature of the DNA duplex is omitted for clarity.
  • Figure showing the various conformational changes which are observed in circular DNA at different pH.  At a pH of about 12 (alkaline), there is a dip in the sedimentation coefficient, followed by a relentless increase up to a pH of about 13, at which pH the structure converts into the mysterious "Form IV".
  • Stochastic, prokaryotic model of the dynamics of RNA production and transcription locking at the promoter region, due to PSB.
  • Drawing showing the difference between a circular DNA chromosome (a plasmid) with a secondary helical twist only, and one containing an additional tertiary superhelical twist superimposed on the secondary helical winding.
  • Supercoiled structure of linear DNA molecules with constrained ends. The helical nature of the DNA duplex is omitted for clarity.
  • Illustration of how cold shock affects the supercoiling state of the DNA, by blocking the activity of Gyrase. The signs ‘ − ’ and ‘+’ represent negative and positive supercoiling, respectively. Created with BioRender.com. Also shown is a stochastic model of gene expression during cold shock as a function of the global DNA supercoiling state. The transition from ON to OFF of the promoter (P) causes the locking of transcription (i.e. RNA production). When ON, the promoter can produce RNA, from which proteins can be produced. RNA and proteins are always subject to degradation or dilution due to cell division.
COMPRESSED DNA LOOP SUPERCOILED BY PROKARYOTES TO FIT WITHIN A SMALL SPACE
Supercoil; Supercoiling; Dna, circular; Supercoiling of DNA; Positive supercoiling; Twist (DNA); Writhe (DNA); Supercoiled; Superhelical DNA energetics; Surface wrapping of DNA; DNA supercoiling; Circular genome; Supercoiled DNA; Superhelical DNA; Supertwisted DNA; Plectonemic supercoil; Linking number of DNA; Negative supercoiling; Superhelical dna
DNA supercoiling refers to the amount of twist in a particular DNA strand, which determines the amount of strain on it. A given strand may be "positively supercoiled" or "negatively supercoiled" (more or less tightly wound).

Википедия

Writhe

In knot theory, there are several competing notions of the quantity writhe, or Wr {\displaystyle \operatorname {Wr} } . In one sense, it is purely a property of an oriented link diagram and assumes integer values. In another sense, it is a quantity that describes the amount of "coiling" of a mathematical knot (or any closed simple curve) in three-dimensional space and assumes real numbers as values. In both cases, writhe is a geometric quantity, meaning that while deforming a curve (or diagram) in such a way that does not change its topology, one may still change its writhe.