Results 71 to 80 of about 605,731 (305)

Heterotropic regulation and negative homotropic cooperativity

FEBS Open Bio, EarlyView.
We identified a structural module common to some proteins that couple negative cooperativity with heterotropic regulation, two features that rarely coexist. These proteins are ring‐like and present an ordered asymmetry whereby noncontacting subunits are symmetric, and their tertiary structure differs from that of contacting subunits.
Veronica Morea, Francesco Angelucci, Federica Arnesano, Gianmarco Pascarella, Patrizio Di Micco, Andrea Bellelli   +5 more
wiley   +1 more source

Spectral extremal graphs for fan graphs

Discrete Mathematics
21 pages,2 ...
Loujun Yu, Yongtao Li, Yuejian Peng
openaire   +4 more sources

Color the cycles [PDF]

, 2013
The cycles of length k in a complete graph on n vertices are colored in such a way that edge-disjoint cycles get distinct colors.
Katona, Gyula, Tuza, Zsolt
core   +1 more source

Comparative assessment of crystallographic and cryo‐EM models in the Protein Data Bank

FEBS Open Bio, EarlyView.
Raw data obtained by X‐ray crystallography or cryo‐EM result in experimental maps, ultimately fitted by atomic models. Although the physical principles are different, the final results can be viewed, compared, and evaluated in the same way. With cryogenic electron microscopy (cryo‐EM) on track to surpass X‐ray crystallography as the preferred method ...
Alexander Wlodawer, Pawel Rubach, Zbigniew Dauter, Wojciech Dec, Dariusz Brzezinski, Marta Kulik, Wladek Minor, Mariusz Jaskolski   +7 more
wiley   +1 more source

Extremal Matching Energy of Random Polyomino Chains

Entropy, 2017
Polyomino graphs is one of the research objectives in statistical physics and in modeling problems of surface chemistry. A random polyomino chain is a subgraph of a polyomino graph.
Tingzeng Wu, Huazhong Lü, Xuexin Zhang
doaj   +1 more source

Spectral extremal graphs for the bowtie

Discrete Mathematics, 2023
22 pages, 6 figures.
Yongtao Li, Lu Lu, Yuejian Peng
openaire   +2 more sources

The extremal algebra on two hermitians with square 1 [PDF]

, 2002
Let Ea(u,v) be the extremal algebra determined by two hermitians u and v with u2 = v2 = 1. We show that: Ea(u,v) = {f=gu:f,g ε C(T)}, where T is the unit circle; Ea(u,v) is C*-equivelant to C*(G), where G is the infinite dihedral group; most of the
Duncan, J., Crabb, M.J., McGregor, C.M.
core   +1 more source

Problems in Ramsey theory, probabilistic combinatorics and extremal graph theory [PDF]

, 2015
In this dissertation, we treat several problems in Ramsey theory, probabilistic combinatorics and extremal graph ...
Narayanan, Bhargav
core   +3 more sources

Relationship Between Neurologic Symptoms and Signs and FMR1 Genotype in Premutation Carriers

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Background and Objectives Fragile X‐associated Tremor/Ataxia Syndrome (FXTAS) is the most severe late‐onset condition caused by a premutation in the FMR1 gene, characterized by expanded CGG triplet repeats of 55–200. Clinical presentations of FXTAS, including gait ataxia, kinetic tremor, cognitive decline, and rare Parkinsonism, are linked to ...
Flora Tassone, Freddy Chafota, Miguel E. Rentería, Randi J. Hagerman, Ellery Santos, Anna Atkinson, Nicholas G. Martin, Elsdon Storey, Danuta Z. Loesch   +8 more
wiley   +1 more source

Extremals of functions on graphs with applications to graphs and hypergraphs

Journal of Combinatorial Theory, Series B, 1982
AbstractThe method used in an article by T. S. Matzkin and E. G. Straus [Canad. J. Math. 17 (1965), 533–540] is generalized by attaching nonnegative weights to t-tuples of vertices in a hypergraph subject to a suitable normalization condition. The edges of the hypergraph are given weights which are functions of the weights of its t-tuples and the graph
T. Sós, Vera, Straus, E. G.
openaire   +4 more sources