Results 221 to 230 of about 2,431 (270)
Gene syntax defines supercoiling-mediated transcriptional feedback
Johnstone CP +14 more
europepmc +1 more source
Computing the Writhe of a Knot
Journal of Knot Theory and Its Ramifications, 2001 We study the variation of the Tait number of a closed space curve according to its different projections. The results are used to compute the writhe of a knot, leading to a closed formula in case of polygonal curves.
David Cimasoni
exaly +8 more sources
Conformal Invariance of the Writhe of a Knot [PDF]
Journal of Knot Theory and Its Ramifications, 2010 We give a new proof of the conformal invariance of the writhe of a knot from a conformal geometric vewpoint.
Langevin, R., O'Hara, J.
exaly +5 more sources
The Writhe of Knots in the Cubic Lattice
Journal of Knot Theory and Its Ramifications, 1997 The writhe of a knot in the simple cubic lattice [Formula: see text] can be computed as the average linking number of the knot with its pushoffs into four non-antipodal octants. We use a Monte Carlo algorithm to generate a sample of lattice knots of a specified knot type, and estimate the distribution of the writhe as a function of the length of the ...
Maria Carla Tesi +2 more
exaly +4 more sources
Writhe in the Stretch-Twist-Fold Dynamo [PDF]
Geophysical and Astrophysical Fluid Dynamics, 2009 This article looks at the influence of writhe in the stretch-twist-fold dynamo. We consider a thin flux tube distorted by simple stretch, twist, and fold motions and calculate the helicity and energy spectra. The writhe number assists in the calculations,
Mahboubeh Asgari-Targhi +1 more
exaly +5 more sources
Nullification Writhe and Chirality of Alternating Links
Journal of Knot Theory and Its Ramifications, 1997 In this paper, we show how to split the writhe of reduced projections of oriented alternating links into two parts, called the nullification writhe ω x, and the remaining writhe ω y, such that the sum of these quantities equals the writhe w and each ...
Corinne Cerf
exaly +1 more source
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Formulae for the Calculation and Estimation of Writhe
Journal of Knot Theory and Its Ramifications, 1995Detailed analyses and proofs of various formulae used for the calculation and estimation of the writhe of a space curve are given. A new formula for calculating the rate of change of writhe under smooth deformation is presented. This latter result is used to show that the writhe of a closed curve evolving under certain nonlinear evolution equations is
Michael Tabor
exaly +3 more sources
The Writhe of Oriented Polygonal Graphs
Journal of Knot Theory and Its Ramifications, 2008Given an edge-oriented polygonal graph in ℝ3, we describe a method for computing the writhe as the average of weighted directional writhe numbers of the graph in a few directions. These directions are determined by the graph and the weights are determined by areas of path-connected open regions on the unit sphere.
Laing, Christian, Sumners, De Witt
exaly +2 more sources
Möbius molecules with twists and writhes
Chemical Communications, 2013Möbius molecules do not have to be highly strained. There are general strategies to design their synthesis, and to analyze their topology.
Gaston R, Schaller, Rainer, Herges
openaire +2 more sources