Results 51 to 60 of about 7,566,926 (308)
Time after time – circadian clocks through the lens of oscillator theory
FEBS Letters, EarlyView.Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo +2 more
wiley +1 more source
Extinction of solutions to a diffusion problem with nonlinear sources and variable density
Results in Applied Mathematics, 2022 In this paper, we investigate the extinction of solutions to a diffusion problem with a variable density as follows, (0.1) ρ(x)ut=Δum+ρ(x)u∫Ωupdx(x,t)∈Ω×[0,T),u(x,t)=0(x,t)∈∂Ω×[0,T),u(x,0)=u0(x)x∈Ω.We give some sufficient conditions for the extinction of
Weijie Jiang, Junhui Xie
doaj +1 more source
On comparison principle and strict positivity of solutions to the nonlinear stochastic fractional heat equations [PDF]
, 2014 In this paper, we prove a sample-path comparison principle for the nonlinear stochastic fractional heat equation on $\mathbb{R}$ with measure-valued initial data. We give quantitative estimates about how close to zero the solution can be.
Le Chen, Kunwoo Kim
semanticscholar +1 more source
Comparison principles for nonlocal Hamilton-Jacobi equations
Discrete and Continuous Dynamical Systems, 2022 <p style='text-indent:20px;'>We prove the comparison principle for viscosity sub and super solutions of degenerate nonlocal operators with general nonlocal gradient nonlinearities. The proofs apply to purely Hamilton-Jacobi equations of order <inline-formula><tex-math id="M1">\begin{document}$ 0<s<1 $\end{document}< ...
openaire +2 more sources
FEBS Letters, EarlyView.We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee +3 more
wiley +1 more source
Generalized spreading speeds for lattice differential equations with time and space dependence
Electronic Journal of Differential Equations, 2019 This article concerns the spatial spreading speeds for lattice differential equations with general time and space dependence. Firstly, we give the concept of spreading speed intervals.
Ning Wang, Zhi-Cheng Wang
doaj
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
Positivity and nonexistence of solutions for quasilinear inequalities
Electronic Journal of Differential Equations, 2016 We prove a positivity property and a nonexistence theorem for weak solutions of quasilinear differential equalities in R^N. To obtain our results, we use a comparison principle.
Xiaohong Li
doaj
FEBS Letters, EarlyView.We identified a systemic, progressive loss of protein S‐glutathionylation—detected by nonreducing western blotting—alongside dysregulation of glutathione‐cycle enzymes in both neuronal and peripheral tissues of Taiwanese SMA mice. These alterations were partially rescued by SMN antisense oligonucleotide therapy, revealing persistent redox imbalance as ...
Sofia Vrettou, Brunhilde Wirth
wiley +1 more source
Minimal wave speed of traveling wavefronts in delayed Belousov-Zhabotinskii model
Electronic Journal of Qualitative Theory of Differential Equations, 2012 This paper is concerned with the traveling wavefronts of Belousov-Zhabotinskii model with time delay. By constructing proper upper and lower solutions and applying the theory of asymptotic spreading, the minimal wave speed is obtained under the weaker ...
Shuxia Pan, Jie Liu
doaj +1 more source