Universidade Federal da Paraíba

Neutrino oscillations in a Kalb–Ramond black hole background

Abstract The analysis examines how neutrinos behave when their trajectories unfold around a black hole sourced by a Kalb–Ramond field, where spontaneous Lorentz symmetry-breaking reshapes the surrounding geometry. Instead of following the conventional order, the study focuses fir...

Fractional counterpart of a higher-order abstract Cauchy problem

Abstract In this paper, we consider the fractional powers of a linear operator associated with a higher-order abstract Cauchy problem defined by a linear parabolic equation. We also characterize the domain of the fractional powers and discuss the solvability of the fractional equ...

Liouville-type theorems and existence of solutions for quasilinear elliptic problems

This study establishes Liouville-type theorems for indefinite quasilinear elliptic equations in the upper half-space. Additionally, we demonstrate the existence of solutions for this class of problems using the fibering method. Our approach relies on a novel weighted Sobolev embe...

Geometric spaceability in sequence classes and operator ideals

Abstract This paper investigates advanced notions of lineability and spaceability within the frameworks of sequence spaces and operator ideals. We propose the notion of Standard Sequence Classes to provide an environment that unifies numerous classical sequence spaces while prese...

Antimicrobial Resistance, Metal Tolerance, and Virulence Determinants in Gram-negative Opportunistic Pathogens Isolated from Brazilian Groundwater

Abstract Groundwater is a critical freshwater resource, but its quality can be compromised by anthropogenic contamination. Metals may exert selective pressure on microbial communities, promoting metal-tolerant bacteria carrying metal tolerance genes (MTGs), which are often associ...

Potassium Humate and Bacillus aryabhattai Modulate Osmotic and Oxidative Homeostasis and Promote Cowpea Yield Under Drought

Global climate change has intensified prolonged droughts, making the development of sustainable agricultural technologies essential. Although potassium humate (KH) and Bacillus aryabhattai (BA) are recognized individually as effective biostimulants, their joint application repres...

Woven endobridge device compared to stent-assisted coiling and microsurgical clipping for intracranial aneurysms

Background: Endovascular techniques and devices, including Woven EndoBridge (WEB) and stent-assisted coiling (SAC), expand the choice of therapies for complex aneurysms, while the evidence directly comparing them to microsurgical clipping (MSC) remains very limited. This meta-ana...

Topological Compressibility of the Yang-Mills Vacuum: A Semiclassical Prediction for Lattice QCD

We treat the areal density of centre vortices as the order parameter of a homogeneous Ginzburg-Landau functional for the SU(3) vacuum. The quadratic coefficient is fixed, with no free parameters, by the one-loop thick-vortex effective action of Diakonov and Maul, which is negativ...

Topological Compressibility of the Yang-Mills Vacuum: A Semiclassical Prediction for Lattice QCD

We treat the areal density of centre vortices as the order parameter of a homogeneous Ginzburg-Landau functional for the SU(3) vacuum. The quadratic coefficient is fixed, with no free parameters, by the one-loop thick-vortex effective action of Diakonov and Maul, which is negativ...

The Potential of N ‐Benzyl Spiro‐Oxindole Hydantoins as Antileishmanial Agents Against Leishmania infantum

ABSTRACT Leishmaniasis, caused by protozoa of the genus Leishmania remains a significant public health concern due to the high lethality of the visceral form if untreated. Current therapies have important limitations, including toxicity and the availability of only a single appro...

The Scalar Glueball and the Trace Anomaly: Phenomenological Outlook and Open Lattice Challenges for a Dilaton Eective Model of Pure SU(3)

A dilaton effective model of pure SU(3) gauge theory, whose logarithmic potential is fixed by trace-anomaly matching rather than assumed, is confronted with continuum lattice data. Inverting the anomaly relation gives the dilaton vacuum expectation value χ0 = 304 ± 30 MeV, the st...

Alcoholic beer fermentation: impact of glutathione and peroxidase fortification on deoxynivalenol reduction

Abstract The use of contaminated cereals in fermentation processes can elicit a marked response from yeasts in the presence of mycotoxins, as indicated by the production of defense compounds such as peroxidase (PO) and glutathione (GSH) to reduce mycotoxin damage. The objective o...

Glucose Transporter Deficiency Syndrome Type 1 (Glut1‐ DS ): New Insights From a Brazilian Cohort of Patients

ABSTRACT Glucose transporter deficiency syndrome type 1 (Glut1‐DS) is a rare neurometabolic disorder caused by pathogenic variants in SLC2A1 , characterized by epilepsy, neurodevelopmental delay, movement disorders, dysarthria, intellectual disability, and postnatal microcephaly....

One-loop contributions in Lorentz-violating scalar QED with nonminimal coupling

Abstract In the context of perturbative aspects of Lorentz-violating theories, we study the divergent one-loop two-point functions of a Lorentz-violating (LV) extension of scalar QED containing a dimension-five CPT-odd nonminimal coupling. The model is defined through a generaliz...

Machine learning survival models for colorectal cancer: advantages of random survival forests over classification algorithms

Colorectal cancer remains a major cause of cancer-related mortality worldwide, motivating the development of accurate prognostic models. Despite advances in machine learning for survival prediction, a common practice in the literature reformulates time-to-event outcomes as binary...

Macroecological invisibility in apple snails (Gastropoda: Ampullariidae): uneven occurrence and molecular coverage across public repositories

Abstract Apple snails (Ampullariidae) are freshwater gastropods of ecological and economic importance, but their digital representation remains uneven across taxa, regions and data types. Using a 171-species taxonomic reference, we integrated global occurrence and molecular data...

Sexual dimorphism of the human calcaneus: a cross-sectional morphometric study

Sex estimation from skeletal remains is a fundamental step in forensic anthropology. The calcaneus, the largest tarsal bone, is robust and may serve as an alternative indicator when the skull and pelvis are unavailable. This study evaluated sexual dimorphism in the calcaneus of a...

Mapping the IntermolecularInteraction Landscape ina New Nicotinamide–Undecanoic Acid Cocrystal: SupramolecularStructure, Spectroscopic Analyses, and Computational Studies

Abstract A novel cocrystal composed of nicotinamide (NA) and undecanoic acid (UA) in a 1:1 stoichiometry has been successfully synthesized via slow evaporation and comprehensively characterized through a multidisciplinary approach combining experimental and computational methods....

Investor sentiment, IFRS and market mispricing in emerging economies

Purpose This study investigates whether the adoption of International Financial Reporting Standards (IFRS) moderates the relationship between investor sentiment, both local and global, and subsequent asset returns in emerging markets. We explore whether IFRS adoption mitigates th...

Black Hole Gravitational Phenomena in Higher-Order Curvature–Scalar Gravity

This work aims to explore the gravitational consequences of a recently proposed black hole solution previously introduced, which incorporates quantum gravitational corrections of General Relativity. We initiate our analyses by taking into account the horizon structure, focusing o...