Results 41 to 50 of about 5,620 (189)

In Hyphomicrobium denitrificans Two Related Sulfane‐Sulfur Responsive Transcriptional Repressors Regulate Thiosulfate Oxidation and Have a Deep Impact on Nitrate Respiration and Anaerobic Biosyntheses

Molecular Microbiology, Volume 124, Issue 3, Page 204-220, September 2025.
In Hyphomicrobium denitrificans, the use of thiosulfate as a supplemental electron donor is regulated by two homologous sulfane‐sulfur responsive ArsR‐type transcriptional repressors, sHdrR and SoxR, that act cooperatively. Remarkably, the regulation by sHdrR/SoxR extends far beyond sulfur oxidation and deeply affects anaerobic metabolism, particularly
Jingjing Li, Nora E. Schmitte, Kaya Törkel, Christiane Dahl   +3 more
wiley   +1 more source

Problems with Missing Tricomi Condition and Analog of Frankl Condition for One Class of Mixed Type Equations

Mathematics
In this paper, for a mixed elliptic-hyperbolic type equation with various degeneration orders and singular coefficients, theorems of uniqueness and existence of the solution to the problem with a missing Tricomi condition on boundary characteristic and ...
Assel Makulbay, Mirakhmat Mirsaburov, Abdumauvlen Berdyshev, Gulbakhor Mirsaburova   +3 more
doaj   +1 more source

The Dynamics of Fast and Slow Earthquake Ruptures in Viscoelastic Materials

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 6, June 2025.
Abstract Classical theories using linear elasticity predict that crack propagation asymptotically approaches a limiting speed, beyond which the energy balance becomes unphysical. However, geophysical and laboratory observations show that ruptures can propagate at either a very low, stable speed or a significantly high speed.
Huihui Weng
wiley   +1 more source

Irreversible Investment under L\'evy Uncertainty: an Equation for the Optimal Boundary [PDF]

, 2014
We derive a new equation for the optimal investment boundary of a general irreversible investment problem under exponential L\'evy uncertainty. The problem is set as an infinite time-horizon, two-dimensional degenerate singular stochastic control problem.
Ferrari, Giorgio, Salminen, Paavo
core  

Quaternary stabilization of a GH2 β‐galactosidase from the psychrophile A. ikkensis, a flexible and unstable dimeric enzyme

Protein Science, Volume 34, Issue 5, May 2025.
Abstract Studies of cold‐active enzymes may elucidate the basis for low‐temperature activity and contribute to their wider application in energy‐efficient processes. Here we investigate the cold‐active GH2 β‐galactosidase from the psychrophilic bacterium Alkalilactibacillus ikkensis (AiLac).
Jan S. Nowak, Nikoline Kruuse, Helena Ø. Rasmussen, Pengfei Tian, Julie Astono, Søren Schultz‐Nielsen, Mariane S. Thøgersen, Peter Stougaard, Jan Skov Pedersen, Daniel E. Otzen   +9 more
wiley   +1 more source

Topological coordination numbers and coordination reciprocity from electron‐density distributions

Acta Crystallographica Section A, Volume 81, Issue 3, Page 221-244, May 2025.
An approach is presented to calculate topological coordination numbers (tCNs) obeying the principle of coordination reciprocity from solid angles subtended by the interatomic surfaces of electron density (QTAIM) atomic domains. The tCN approach characterizes a compound's coordination situation as a set of sub‐coordination scenarios with associated ...
Frank R. Wagner, Riccardo Freccero, Yuri Grin   +2 more
wiley   +1 more source

The approximate solution of Wiener-Hopf integral equations

Journal of Mathematical Analysis and Applications, 1972
AbstractThis paper develops an explicit approximate method of solving the integral equation (∗) f(x) = ∫0∞ h1(x − t)f(t) dt + g(x), x > 0, where g(x), h1(x) ϵ L1(R) ∩ L2(R),f(x) = g(x) = 0 if x < 0. The approximate solution depends upon 2 parameters, h > 0 and k ϵ (0, 1).
openaire   +2 more sources

Optimized Hybrid Probabilistic and Geometric Constellation Shaping for Coherent Optical Communication Systems Using End‐to‐End Learning

Advanced Photonics Research, Volume 6, Issue 4, April 2025.
In this article, hybrid probabilistic and geometric constellation shaping to enhance spectral efficiency in coherent optical communication systems, particularly under a Wiener phase noise channel, is investigated. By integrating a two‐stage phase search algorithm with digital signal processing and gradient descent, the method outperforms geometrically ...
Zhiyang Liu, Lu Zhang, Xiaoyu Liu, Shilin Xiao, Weiying Yang, Weisheng Hu   +5 more
wiley   +1 more source

Asymptotics of block Toeplitz determinants with piecewise continuous symbols

Communications on Pure and Applied Mathematics, Volume 78, Issue 1, Page 120-160, January 2025.
Abstract We determine the asymptotics of the block Toeplitz determinants detTn(ϕ)$\det T_n(\phi)$ as n→∞$n\rightarrow \infty$ for N×N$N\times N$ matrix‐valued piecewise continuous functions ϕ$\phi$ with a finitely many jumps under mild additional conditions.
Estelle Basor, Torsten Ehrhardt, Jani A. Virtanen   +2 more
wiley   +1 more source

A fast realization of preconditioned Conjugate Gradients for Wiener-Hopf integral equations

Applied Mathematics Letters, 1995
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Gohberg, I., Koltracht, I.
openaire   +2 more sources