Results 41 to 50 of about 756,745 (314)

Pontryagin invariants and integral formulas for Milnor's triple linking number [PDF]

J. Math. Phys. 54 (2013) no. 1, 2011
To each three-component link in the 3-sphere, we associate a geometrically natural characteristic map from the 3-torus to the 2-sphere, and show that the pairwise linking numbers and Milnor triple linking number that classify the link up to link homotopy correspond to the Pontryagin invariants that classify its characteristic map up to homotopy.
arxiv   +1 more source

Vacuum Solutions of Classical Gravity on Cyclic Groups from Noncommutative Geometry [PDF]

, 2001
Based on the observation that the moduli of a link variable on a cyclic group modify Connes' distance on this group, we construct several action functionals for this link variable within the framework of noncommutative geometry.
Dai, Jian, Song, Xing-Chang
core   +6 more sources

Wind Direction Retrieval Using Spaceborne GNSS-R in Nonspecular Geometry

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020
A wind direction retrieval algorithm using spaceborne global navigation satellite system reflectometry (GNSS-R) in nonspecular geometry is presented. This article first focuses on investigating the influence of wind direction on the scattering strength ...
Guodong Zhang, Dongkai Yang, Yongqing Yu, Feng Wang   +3 more
doaj   +1 more source

Reconstructing Quantum Geometry from Quantum Information: Spin Networks as Harmonic Oscillators

, 2005
Loop Quantum Gravity defines the quantum states of space geometry as spin networks and describes their evolution in time. We reformulate spin networks in terms of harmonic oscillators and show how the holographic degrees of freedom of the theory are ...
Ashtekar A, Baez J, Barrett J W, Brunnemann J Thiemann T, Connes A, Corichi A, Dreyer O Markopoulou F Smolin L, Etera R Livine, Florian Girelli, Girelli F Livine E R Terno D, Goodman R, Krasnov K, Landi G, Livine E R, Livine E R Oriti D Speziale S, Madore J, Madore J Saeger L A, Markopoulou F Smolin L, Marzuoli A Rasetti M, Marzuoli A Rasetti M, Perelomov A, Reisenberger M, Rovelli C, Schucker T, Smolin L, Smolin L, Stachel J Iftime M, Swain J, Taylor W, Thiemann T   +29 more
core   +2 more sources

Functional variation among LPMOs revealed by the inhibitory effects of cyanide and buffer ions

FEBS Letters, EarlyView.
This study addresses the inhibition of lytic polysaccharide monooxygenases (LPMOs) by cyanide and explains how and why the magnitude of observed inhibitory effects depends on the way LPMO reactions are setup and on the type of LPMO. Enzymes known as lytic polysaccharide monooxygenases (LPMOs) are mono‐copper polysaccharide‐degrading peroxygenases that ...
Ole Golten, Lorenz Schwaiger, Zarah Forsberg, Kelsi R. Hall, Anton A. Stepnov, Tom Z. Emrich‐Mills, Iván Ayuso‐Fernández, Morten Sørlie, Roland Ludwig, Åsmund Kjendseth Røhr, Vincent G. H. Eijsink   +10 more
wiley   +1 more source

Noncommutative Schwarzschild geometry and generalized uncertainty principle

European Physical Journal C: Particles and Fields, 2019
We discuss a possible link between the deformation parameter $$\Theta ^{\mu \nu }$$ Θμν arising in the framework of noncommutative geometry and the parameter $$\beta $$ β of the generalized uncertainty principle (GUP). We compute the shift of the Hawking
T. Kanazawa, G. Lambiase, G. Vilasi, A. Yoshioka   +3 more
doaj   +1 more source

The apo LETM1 F‐EF‐hand adopts a closed conformation that underlies a multi‐modal sensory role in mitochondria

FEBS Letters, EarlyView.
We present the first solution structure of the Ca2+‐depleted LETM1 F‐EF‐hand through a D676A/N678A Ca2+ binding‐deficient mutant, revealing a closed hydrophobic cleft caused by a unique F1‐helix pivot. The apo LETM1 F‐EF‐hand exhibits regiospecific hot and cold unfolding, sensitivity to physiological pH changes and potential for promiscuous heterotypic
Qi‐Tong Lin, Danielle M. Colussi, Peter B. Stathopulos   +2 more
wiley   +1 more source

Shape and fluctuations of frustrated self-assembled nano ribbons

Nature Communications, 2019
Supramolecular assemblies achieve nontrivial structures but there is no general framework to link their formation to molecular properties. Here the authors propose a model that relates molecular geometry and interactions to nanoribbon formation ...
Mingming Zhang, Doron Grossman, Dganit Danino, Eran Sharon   +3 more
doaj   +1 more source

Positive Braid Links with Infinitely Many Fillings [PDF]

arXiv, 2020
We prove that any positive braid Legendrian link not isotopic to a standard finite type link admits infinitely many exact Lagrangian fillings.
arxiv  

The solution supramolecular structure of α2 → 8 polysialic acid suggests a structural cause for its low immunogenicity

FEBS Letters, EarlyView.
α2 → 8 polysialic acid elicits poor immunogenicity. Small‐angle scattering shows a supramolecular structure with parallel‐chain binding, although in different forms at μm and mm calcium. The major histocompatibility complex requires molecular weights around 2000 Da to produce antibodies, and 2000 Da polysialic oligomers will bind in these structures ...
Kenneth A. Rubinson
wiley   +1 more source