Universidade Federal do Maranhão

Crystallographic and Spectroscopic Evidence of High-Pressure Phase Transition of l -Histidine Methyl Ester Dihydrochloride

Abstract We investigate the dependence of the structural and vibrational properties of l-histidine methyl ester dihydrochloride (LHMED) on high-pressure conditions in the range of 0.0–8.2 GPa. Combining single-crystal X-ray diffraction (SCXRD) and Raman spectroscopy, we found a r...

Thermal Cycle–Microstructure–Property Relationships in Rail Steel Heat‐Affected Zone Simulated by Gleeble

This study investigates the microstructural evolution and mechanical response of premium rail steel subjected to heat‐affected zone (HAZ) thermal cycles representative of flash butt welding (FBW). Dilatometry experiments were performed using a Gleeble thermomechanical simulator....

Thermodynamic analysis of charged anti-de Sitter black holes with cloud of strings in Einstein-bumblebee gravity via Bekenstein–Hawking and Tsallis entropies

Abstract We investigate the thermodynamic properties of charged anti-de Sitter (AdS) black holes surrounded by a cloud of strings in bumblebee gravity. In this framework, the cloud-of-strings parameter α and the Lorentz-violating parameter ℓ modify the horizon structure, the Hawk...

Evolution of Outcome Assessment in Chronic Low Back Pain Clinical Trials Throughout the 20th and 21st Centuries: A Scoping Review

OBJECTIVE: To identify, map, and synthesise the outcomes reported in patients with Chronic Low Back Pain (CLBP) and describe how these outcomes have changed over time throughout the 20th and 21st centuries. METHODS: A scoping review was conducted according to the Joanna Briggs In...

Synthetic twist geometry in mesoscopic quantum circuits: geometric capacitance and chiral mode splitting

Abstract We propose a route for encoding a helicoidally twisted synthetic geometry in mesoscopic quantum circuits. A torsionless spatial metric with twist parameter Ω defines an electrostatic capacitance kernel whose angular–axial sector contains the chiral coupling −2Ωmk. We sho...

Silicon Fertigation and Azospirillum brasilense Modulate the Microbiological Profile of Total Mixed Ration Silage for Dairy Goats

The objective of this study was to evaluate the effects of fertigation with silicon (Si) combined with inoculation with Azospirillum brasilense during off-season corn cultivation on the fermentation profile, microbiological quality, and chemical and bromatological composition of...

Holographic Complexity as a Probe of Boundary Entropy in AdS/BCFT

We investigate how the sewing operations familiar from topological quantum field theory provide a useful organizational framework for semiclassical AdS/BCFT path integrals. Our purpose is not to identify AdS/BCFT with a topological field theory: the bulk geometry, the end-of-the-...

Adjunctive mild controlled hypothermia for moderate necrotizing enterocolitis in very low birth weight infants: a prospective cohort study with external contemporaneous controls

Abstract Necrotizing enterocolitis (NEC) is a severe condition in preterm infants. Few therapies are available to slow disease progression or reduce the need for surgery. This study aims to assess if mild controlled hypothermia as an adjunctive treatment reduces surgical interven...

Robustness, convergence, and homoclinic classes in the dynamics of the Hénon map

We analyze the dynamics of the Hénon map 𝑇 𝑎 , 𝑏 ⁡ ( 𝑥 , 𝑦 ) = ( 𝑦 + 1 − 𝑎 ⁢ 𝑥 2 , 𝑏 ⁢ 𝑥 ) from three complementary perspectives. First, we prove the persistence of a trapping region for parameters ( 𝑎 ′ , 𝑏 ′ ) near ( 1 . 4 , 0 . 3 ) , showing that the associated attractor 𝛬 𝑎 ′...

Bioactive hydrophobic bonding resins containing fluoroaluminosilicate particles and polyacrylic acid for experimental two-step self-etch adhesive systems: Mechanical behavior, ion release, cell viability, and calcium phosphate surface precipitation

Objective To develop and characterize experimental bioactive hydrophobic bonding resins containing non-silanized fluoroaluminosilicate particles (Bio F) and polyacrylic acid (PAA) as part of a two-step self-etch adhesive system. Methods Non-silanized Bio F particles at 5 wt% or 1...

Bisexual population of the parthenogenetic tick Amblyomma rotundatum: bioecological data from the field and laboratory

The tick Amblyomma rotundatum parasitizes primarily cold-blooded animals and is widely distributed in the Neotropics. This tick is considered parthenogenetic, with rare reports of males in nature. In the present study, we identified for the first time a bisexual population of A....

First Report on Metal Contamination and Associated Human Health Risks in the Smooth Butterfly Ray Gymnura cf. micrura (Myliobatiformes: Gymnuridae) from the Brazilian Amazon Coast

Metal accumulation in batoids reflects both environmental exposure and physiological regulation, although studies concerning this group are still scarce. The Smooth butterfly ray (Gymnura cf. micrura) is consumed in northeastern Brazil, yet information on metal contamination and...

Efficacy and Pharmacokinetics of Guanidine Derivative LQOF-G2 in an In Vivo Leishmania (Viannia) braziliensis Model

Background/Objectives: Due to their toxicity and the limited efficacy of current therapies, Leishmaniases represent a major public health challenge. The search for new treatments is urgent. LQOF-G2 is a synthetic guanidine compound whose in vitro leishmanicidal potential has alre...

Mapping ESG evolution in Brazilian ports: A text-mining approach to sustainability reporting

The alignment of port sustainability governance with international maritime policy frameworks requires ports to move beyond compliance-oriented reporting towards substantive climate performance disclosure. This study investigates the evolution of ESG disclosures in Brazilian port...

Association of sleep efficiency with cardiac autonomic modulation in young and professional soccer players during pre-season

Abstract Objective This study investigated the association between sleep efficiency and cardiac autonomic modulation in young and professional soccer players during pre-season. Methods A cross-sectional quantitative study was conducted with 53 male soccer players divided into thr...

Rapid increase of climate extremes reveals new areas of concern in Amazonia

Abstract Amazonia is highly sensitive to climate extremes, yet we lack an Amazon-wide assessment that examines the spatial-temporal changes in these extreme conditions. We address this within seasons and across the hydrological year, using a quantiles approach that integrates the...

Green Chemistry Oriented Pluronic F127/Carbopol Nanogel Platform (NGLp) Encapsulating Lippia pedunculosa Essential Oil for Aedes aegypti Larval Control

Abstract Control of Aedes aegypti larvae is essential to reduce arbovirus transmission; however, increasing insecticide resistance and environmental concerns highlight the urgent need for sustainable alternatives. In this study, a solvent-free thermoresponsive nanogel (NGLp), bas...

Effects of a Cycling‐Based Aerobic Exercise Program Versus a Resistance and Neuromuscular Exercise Program on Exercise‐Induced Hypoalgesia in Knee Osteoarthritis: A Study Protocol for a Randomized Clinical Trial

ABSTRACT Background and Purpose Exercise therapy is a core treatment for knee osteoarthritis (KOA), but the effects of different exercise modalities on endogenous pain modulation remain unclear. This trial will compare a cycling‐based aerobic exercise program with a resistance an...

Deep Learning-Based Hydrothermal Scheduling Integrating Wind Power and Pumped-Storage Hydropower for Low-Carbon Economic Dispatch

The increasing penetration of variable renewable energy sources into electric power systems requires advanced optimization tools to address the complexity of hybrid hydrothermal scheduling while minimizing generation costs and carbon emissions. This study investigates the applica...

Thermodynamics and orbital structure of anti-de Sitter black holes in Palatini-inspired nonlinear electrodynamics

Abstract We construct a consistent anti-de Sitter completion of the static and spherically symmetric black-hole solution sourced by the Palatini-inspired nonlinear electrodynamics $$Y^n$$ Y n model. Here, “Palatini-inspired” denotes exclusively a first-order formulation of the el...