2,383 results match your criteria: "Mathematical Institute[Affiliation]"

Patterning of nonlocal transport models in biology: The impact of spatial dimension.

Math Biosci

October 2023

Wolfson Centre for Mathematical Biology, Mathematical Institute, University of Oxford, Andrew Wiles Building, Radcliffe Observatory Quarter, Woodstock Road, Oxford, OX2 6GG, United Kingdom. Electronic address:

Throughout developmental biology and ecology, transport can be driven by nonlocal interactions. Examples include cells that migrate based on contact with pseudopodia extended from other cells, and animals that move based on their awareness of other animals. Nonlocal integro-PDE models have been used to investigate contact attraction and repulsion in cell populations in 1D.

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Background: Children and young adults needing surgery for a primary malignant bone tumour around the knee face a difficult, life-changing decision. A previous study showed that this population wants to be involved more in the decision-making process and that more involvement leads to less decisional stress and regret. Therefore, a well-designed and standardized decision-making process based on the principles of shared decision-making needs to be designed, implemented, and evaluated.

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Categorical Landau Paradigm for Gapped Phases.

Phys Rev Lett

October 2024

Mathematical Institute, University of Oxford, Woodstock Road, Oxford, OX2 6GG, United Kingdom.

We propose a unified framework to classify gapped infrared phases with categorical symmetries, leading to a generalized, categorical Landau paradigm. This is applicable in any dimension and gives a succinct, comprehensive, and computationally powerful approach to classifying gapped symmetric phases. The key tool is the symmetry topological field theory, which is a one dimension higher topological field theory with two boundaries that we choose to be topological.

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Article Synopsis
  • HIV-1 transmission typically starts with a single genetic variant in 75% of new infections, leading to a genetic bottleneck.
  • Studies on multiple variant infections suggest they might elevate viral load and speed up CD4 T cell decline, but results have been inconsistent.
  • Our analysis shows many studies lacked the statistical power to confirm these effects, and our models indicate that a faster CD4 decline isn't automatically linked to multiple variant infections without a clear cause-and-effect relationship.
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Due to the relatively advanced age and high mortality rate of patients with high-grade chondrosarcoma (CS), it is important to holistically assess patient- and tumor characteristics in multidisciplinary team and shared decision-making with regard to treatment options. While current prognostic models include multiple tumor and treatment characteristics, the only patient characteristics that are commonly included are age and gender. Based on clinical experience, we believe that factors related to patient preoperative systemic health status such as the American Society of Anesthesiologists (ASA) score may be equally important prognostic factors for overall survival (OS).

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Surrogate optimisation holds a big promise for building energy optimisation studies due to its goal to replace the use of lengthy building energy simulations within an optimisation step with expendable local surrogate models that can quickly predict simulation results. To be useful for such purpose, it should be possible to quickly train precise surrogate models from a small number of simulation results (10-100) obtained from appropriately sampled points in the desired part of the design space. Two sampling methods and two machine learning models are compared here.

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Convolution identities for divisor sums and modular forms.

Proc Natl Acad Sci U S A

October 2024

Mathematical Department, University of Lille, Villeneuve d'Ascq Cedex 59655, France.

We consider certain convolution sums that are the subject of a conjecture by Chester, Green, Pufu, Wang, and Wen in string theory. We prove a generalized form of their conjecture, explicitly evaluating absolutely convergent sums [Formula: see text]where [Formula: see text] is a Laurent polynomial with logarithms. Contrary to original expectations, such convolution sums, suitably extended to [Formula: see text], do not vanish, but instead, they carry number theoretic meaning in the form of Fourier coefficients of holomorphic cusp forms.

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Background & Aims: Smell and taste changes are frequently reported bothersome treatment symptoms during treatment for childhood cancer and assumed to influence outcomes such as food intake. Since nutritional status of children with cancer is already vulnerable, any detrimental effects on food intake should be prevented. Therefore, understanding the exact relationship between chemosensory changes and dietary intake, eating behavior, and other domains such as health-related quality of life (HRQoL), is important for improving outcomes.

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A Particle Method for the Multispecies Landau Equation.

Acta Appl Math

October 2024

Department of Applied Mathematics, University of Washington, Seattle, WA 98195 USA.

The multispecies Landau collision operator describes the two-particle, small scattering angle or grazing collisions in a plasma made up of different species of particles such as electrons and ions. Recently, a structure preserving deterministic particle method (Carrillo et al. in J.

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Translation regulation by RNA stem-loops can reduce gene expression noise.

BMC Bioinformatics

October 2024

Department of Electrical and Computer Engineering, University of Delaware, Newark, 19716, USA.

Background: Stochastic modelling plays a crucial role in comprehending the dynamics of intracellular events in various biochemical systems, including gene-expression models. Cell-to-cell variability arises from the stochasticity or noise in the levels of gene products such as messenger RNA (mRNA) and protein. The sources of noise can stem from different factors, including structural elements.

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The structure of a complex network plays a crucial role in determining its dynamical properties. In this paper , we show that the the degree to which a network is directed and hierarchically organized is closely associated with the degree to which its dynamics break detailed balance and produce entropy. We consider a range of dynamical processes and show how different directed network features affect their entropy production rate.

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Localization of the Free Energy in Supergravity.

Phys Rev Lett

October 2024

Mathematical Institute, University of Oxford, Woodstock Road, Oxford OX2 6GG, United Kingdom.

We derive a general formula for the gravitational free energy of Euclidean supersymmetric solutions to D=4, N=2 gauged supergravity coupled to vector multiplet matter. This allows one to compute the free energy without solving any supergravity equations, just assuming the solutions exist. As well as recovering some known results in the literature with ease, we also present new supergravity results that match with holographically dual field theory computations.

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Background: In group-sequential designs, it is typically assumed that there is no time gap between patient enrollment and outcome measurement in clinical trials. However, in practice, there is usually a lag between the two time points. This can affect the statistical analysis of the data, especially in trials with interim analyses.

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Purpose: Standard of care for various retinal diseases involves recurrent intravitreal injections. This motivates mathematical modeling efforts to identify influential factors for ocular drug residence time, aiming to minimize administration frequency. We sought to describe the vitreal diffusion of therapeutics in nonclinical species frequently used during drug development assessments.

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Despite the achievements of modern medicine, tuberculosis remains one of the leading causes of mortality globally. The difficulties in differential diagnosis have particular relevance in the case of suspicion of tuberculosis with other granulomatous diseases. The most similar clinical and radiologic changes are sarcoidosis.

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In this paper we study bifurcations in mass-action networks with two chemical species and reactant complexes of molecularity no more than two. We refer to these as planar, quadratic networks as they give rise to (at most) quadratic differential equations on the nonnegative quadrant of the plane. Our aim is to study bifurcations in networks in this class with the fewest possible reactions, and the lowest possible product molecularity.

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Agrarian and -Betti numbers of locally indicable groups, with a twist.

Math Ann

March 2024

Mathematical Institute, University of Oxford, Andrew Wiles Building, Radcliffe Observatory Quarter, Woodstock Road, Oxford, OX2 6GG UK.

We prove that twisted -Betti numbers of locally indicable groups are equal to the usual -Betti numbers rescaled by the dimension of the twisting representation; this answers a question of Lück for this class of groups. It also leads to two formulae: given a fibration with base space having locally indicable fundamental group, and with a simply-connected fiber , the first formula bounds -Betti numbers of in terms of -Betti numbers of and usual Betti numbers of ; the second formula computes exactly in terms of the same data, provided that is a high-dimensional sphere. We also present an inequality between twisted Alexander and Thurston norms for free-by-cyclic groups and 3-manifolds.

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Currently liver transplantation is the only treatment option for liver disease, but organ availability cannot meet patient demand. Alternative regenerative therapies, including cell transplantation, aim to modulate the injured microenvironment from inflammation and scarring towards regeneration. The complexity of the liver injury response makes it challenging to identify suitable therapeutic targets when relying on experimental approaches alone.

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Article Synopsis
  • Helicobacter pylori (H. pylori) is a type of bacteria that can live in the human stomach and make people sick by causing infections.
  • This bacteria has clever ways to hide from the body's immune system, such as changing its surface to avoid detection and blocking important signals that help fight infections.
  • Scientists used a special imaging technique on mice to see how immune cells, like neutrophils and macrophages, react to H. pylori in real-time, which helps them understand how infections work better.
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Study of impacts of two types of cellular aging on the yeast bud morphogenesis.

PLoS Comput Biol

September 2024

Department of Mathematics, University of California, Riverside, California, United States of America.

Article Synopsis
  • Understanding how cells age is important for extending lifespan and studying age-related diseases.
  • Yeast cells serve as a useful model due to their genetics and short cell cycle, revealing two distinct aging modes linked to nucleolar and mitochondrial declines.
  • A developed model suggests that aging affects how yeast cells grow and stabilize their buds, specifically how they insert new materials at the bud tip, potentially influencing the shape and growth of these buds.
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On the profinite rigidity of free and surface groups.

Math Ann

January 2024

Mathematical Institute, University of Oxford, Radcliffe Observatory, Andrew Wiles Building, Woodstock Rd, Oxford, OX26GG UK.

Let be either a free group or the fundamental group of a closed hyperbolic surface. We show that if is a finitely generated residually- group with the same pro- completion as , then two-generated subgroups of are free. This generalises (and gives a new proof of) the analogous result of Baumslag for parafree groups.

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Correction: Morzhin, O.V.; Pechen, A.N. Control of the von Neumann Entropy for an Open Two-Qubit System Using Coherent and Incoherent Drives. 2024, , 36.

Entropy (Basel)

September 2024

Department of Mathematical Methods for Quantum Technologies & Steklov International Mathematical Center, Steklov Mathematical Institute of Russian Academy of Sciences, 8 Gubkina Str., 119991 Moscow, Russia.

In the published article [...

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Risk factors for dysphoric milk ejection reflex.

Am J Obstet Gynecol

February 2025

Department of Pediatric Oncology and Hematology, Hannover, Germany; RESIST Cluster of Excellence, Hannover, Germany; Biomedical Research in End-stage and Obstructive Lung Disease Hannover (BREATH), German Center for Lung Research (DZL), Hannover, Germany.

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Article Synopsis
  • The text discusses advancements in single-particle cryo-electron microscopy (cryo-EM), specifically focusing on common lines between projection images of molecules.
  • It introduces a new low-rank constraint on a matrix that holds scaled basis vectors, which helps in denoising the common lines and recovering unknown 3D rotations of the images.
  • Furthermore, the paper presents a clustering algorithm to group noisy images into similar communities, effectively addressing the issue of discrete heterogeneity in cryo-EM, with results shown on both synthetic and real datasets.
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A standard practice in statistical hypothesis testing is to mention the -value alongside the accept/reject decision. We show the advantages of mentioning an e-value instead. With -values, it is not clear how to use an extreme observation (e.

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