Results 51 to 60 of about 682,080 (270)

Max-Weight Revisited: Sequences of Non-Convex Optimisations Solving Convex Optimisations [PDF]

, 2014
We investigate the connections between max-weight approaches and dual subgradient methods for convex optimisation. We find that strong connections exist and we establish a clean, unifying theoretical framework that includes both max-weight and dual ...
Leith, Douglas J., Valls, Víctor
core   +1 more source

Structural biology of ferritin nanocages

FEBS Letters, EarlyView.
Ferritin is a conserved iron‐storage protein that sequesters iron as a ferric mineral core within a nanocage, protecting cells from oxidative damage and maintaining iron homeostasis. This review discusses ferritin biology, structure, and function, and highlights recent cryo‐EM studies revealing mechanisms of ferritinophagy, cellular iron uptake, and ...
Eloise Mastrangelo, Flavio Di Pisa
wiley   +1 more source

Stable bundles on hypercomplex surfaces

, 2009
A hypercomplex manifold is a manifold equipped with three complex structures I, J, K satisfying the quaternionic relations. Let M be a 4-dimensional compact smooth manifold equipped with a hypercomplex structure, and E be a vector bundle on M.
A. Besse, A.N. Tyurin, C.P. Boyer, D. Joyce, D. Kaledin, F. Thomas, G. Grantcharov, H. Pedersen, J.M. Bismut, M. Lübke, M. Obata, M. Verbitsky, Ma. Kato, Misha Verbitsky, N. Hitchin, N. Hitchin, N.P. Buchdahl, P. Gauduchon, P. Gauduchon, P. Gauduchon, P.J. Braam, P.S. Howe, Ruxandra Moraru, S. Ivanov, S.J. Gates Jr., V. Apostolov   +25 more
core   +1 more source

Poisson-Lie T-duality of String Effective Actions: A New Approach to the Dilaton Puzzle [PDF]

, 2018
For a particular class of backgrounds, equations of motion for string sigma models targeted in mutually dual Poisson-Lie groups are equivalent. This phenomenon is called the Poisson-Lie T-duality.
Jurco, Branislav, Vysoky, Jan
core   +3 more sources

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source

Boundary Conditions and Unitarity: the Maxwell-Chern-Simons System in AdS_3/CFT_2 [PDF]

, 2012
We consider the holography of the Abelian Maxwell-Chern-Simons (MCS) system in Lorentzian three-dimensional asymptotically-AdS spacetimes, and discuss a broad class of boundary conditions consistent with conservation of the symplectic structure.
AJ Amsel, AP Balachandran, AS Schwarz, CD Fosco, D Birmingham, D Marolf, E D’Hoker, E Witten, E Witten, G Barnich, G Barnich, G Compere, G Mack, GW Moore, H-U Yee, J Lee, J Ren, JD Brown, Juan I. Jottar, K Jensen, K Skenderis, K Skenderis, M Berkooz, M Bos, M Bos, M Fujita, N Lashkari, P Kraus, P Kraus, P Minces, RG Leigh, RM Wald, RM Wald, RM Wald, Robert G. Leigh, S Carlip, S Deser, S El-Showk, S Elitzur, S Gubser, S Minwalla, SA Hartnoll, SA Hartnoll, SS Gubser, SS Gubser, T Andrade, T Hartman, Tomás Andrade, V Balasubramanian, V Balasubramanian, V Iyer, XG Wen, Y Liu   +52 more
core   +2 more sources

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

Nonparametric Information Geometry: From Divergence Function to Referential-Representational Biduality on Statistical Manifolds

Entropy, 2013
Divergence functions are the non-symmetric “distance” on the manifold, Μθ, of parametric probability density functions over a measure space, (Χ,μ). Classical information geometry prescribes, on Μθ: (i) a Riemannian metric given by the Fisher information;
Jun Zhang
doaj   +1 more source

The inter-connections between self-harm and aggressive behaviours: A general network analysis study of dual harm

Frontiers in Psychiatry, 2022
Dual harm is the co-occurrence of self-harm and aggression during an individual’s lifetime. This behaviour is especially prevalent within criminal justice and forensic settings.
Matina Shafti, Matina Shafti, Sarah Steeg, Sarah Steeg, Derek de Beurs, Daniel Pratt, Daniel Pratt, Daniel Pratt, Andrew Forrester, Roger T. Webb, Roger T. Webb, Roger T. Webb, Peter James Taylor, Peter James Taylor   +13 more
doaj   +1 more source

Algebra of Lax Connection for T-Dual Models

, 2008
We study relation between T-duality and integrability. We develop the Hamiltonian formalism for principal chiral model on general group manifold and on its T-dual image. We calculate the Poisson bracket of Lax connections in T-dual model and we show that
Alday L F, Alday L F, Alday L F, Bedoya O A, Beisert N Ricci R Tseytlin A A Wolf M, Berkovits N, Berkovits N, Berkovits N, Berkovits N, Berkovits N, Berkovits N, Bianchi M, Chandia O, Dolan L, Dolan L Nappi C R Witten E, Dorey N, Drummond J M Henn J Korchemsky G P Sokatchev E, Forgacs P, Frolov S, Gomes J F, Grassi P A, Grassi P A, Guttenberg S, Hatsuda M, J Klusoň, Kluson J, Linch W D Vallilo B C, Magro M, Makeenko Y, Mikhailov A Schafer-Nameki S, Minahan J A, Minahan J A, Okamura K, Plefka J, Puletti V G M, Puletti V G M, Ricci R, Tseytlin A A, Vallilo B C, Vallilo B C, Vicedo B   +40 more
core   +1 more source