Universidade Federal do Amazonas

Racial and Socioeconomic Inequities in COVID-19 In-Hospital Mortality in Brazil in the Post-Emergency Era: A National Cohort Study of 19,718 Hospitalized Adults in 2024

Abstract Background In 2024, COVID-19 entered a post-emergency phase, but in-hospital mortality remains a relevant public health concern in Brazil. As population immunity, vaccination, and clinical management evolved, the hierarchy of mortality predictors may have shifted from tr...

The domestic violence myth acceptance scale in Brazil: cross-cultural adaptation and initial construct-validity evidence

Domestic violence against women constitutes a structural public health problem. The original scale measures the endorsement of these beliefs but requires adaptation and psychometric validation for Brazilian Portuguese individuals. The aim of this study was to culturally adapt and...

Measuring the Azorean blue economy: a value chain approach

Economic activities associated with marine and coastal resources – commonly referred to as the blue economy – play a central role in coastal regions such as Portugal. Despite the Azores' small population and structural constraints, the blue economy holds significant potential for...

Bioactivity and nutritional profiling of underexplored unconventional food plants with potential for applications as functional foods

Abstract This study evaluated the bioactive and nutritional properties of six Amazonian unconventional food plants: Piper peltatum , Mansoa alliacea , Leuenbergeria bleo , Bidens bipinnata , Costus spiralis , and Urera caracasana . The phenolic compounds were identified and quant...

Xylem anatomical and hydraulic responses to light conditions guide regeneration management in tropical tree species

Light limits juvenile tree performance in tropical forests, yet we still lack anatomical criteria to predict hydraulic function across contrasting light environments. Understanding how xylem structure adjusts is essential for identifying hydraulic traits that indicate species wit...

Echo Intensity Band Analysis for Assessing Skeletal Muscle Quality in Older Women with Type 2 Diabetes and Peripheral Arterial Disease

Background: Type 2 Diabetes Mellitus (T2DM) and Peripheral Arterial Disease (PAD) are associated with impaired skeletal muscle quality; however, the impact of T2DM alone and the additional burden of concomitant PAD on echo intensity (EI) band distribution remain unclear. This stu...

Reproducible Multicriteria Reanalysis of a Four-Criterion UASB-Oriented Source Matrix for WWTP Biogas-Recovery Prioritization

This study performs a computationally reproducible multicriteria reanalysis of a four-criterion, UASB-oriented source matrix reported in a 2015 MSc dissertation. Two author-generated numerical scenarios, each containing six WWTP alternatives, are treated as constructed cases rath...

Utilization of guarana (Paullinia cupana) biowaste from the Amazon for supercapacitor electrode production

Abstract The valorization of Amazonian biomass residues into porous carbon materials represents a sustainable strategy for the development of energy storage technologies. In this study, guarana ( Paullinia cupana ) husk, an agro-industrial by-product, was converted into activated...

Traceability of Manilkara huberi Using Stable Isotope Ratio Analysis to Support Deforestation Prevention in the Amazon

Abstract Illegal deforestation represents one of the main challenges to the integrity of the Amazon rainforest, warranting the use of reliable tracking methods to identify the geographical origin of timber species inspected during commercial transactions. This study utilizes stab...

Floral dynamics in the protandrous flowers of Bauhinia variegata (Fabaceae): phase-specific morphology, scent, and nectar production

Abstract Main conclusion Protandry in Bauhinia variegata is expressed through coordinated changes in floral morphology, scent composition, secretory activity, and nectar presentation, whereas petal reflectance remains stable; molecular docking further indicates that key phase-ass...

Factors affecting patient safety in teleconsultations for health services: a scoping review protocol.

OBJECTIVE: This review will map the factors affecting patient safety in teleconsultations for health care services. INTRODUCTION: The use of communication technologies has gained prominence in the new paradigm of health care delivery. However, despite this expansion, patient safe...

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...

Extensive and differential platinum chemotherapy mutagenesis in livers of children

Childhood cancer survivors often experience late adverse effects that may be linked to chemotherapy mutagenesis. We studied chemotherapy mutagenesis in normal pediatric tissues using duplex sequencing (NanoSeq) to enable the detection of mutations from single DNA molecules. We fo...

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...

Free-Energy and Position-Dependent Diffusion Profiles Shape Passive Permeation of a Semisynthetic Naphthoquinone across a Model Lipid Bilayer

Abstract Passive membrane permeation depends on both solute partitioning and coordinate-dependent mobility, but their separate and spatial-coupling contributions are rarely quantified within a common resistance framework. CNFD (6b,7-dihydro-5H-cyclopenta[b]naphtho[2,1-d]furan-5,6...

Neural-assisted in-motion self-heading alignment for marine vehicles

Autonomous platforms operating in the oceans require accurate navigation to successfully complete their missions. In this regard, the initial heading estimation accuracy and the time required to achieve it play a critical role. The initial heading is commonly estimated using mode...

Urban landscape composition drives species-specific responses of aerial insectivorous bats in an Amazonian megacity

Abstract Urbanization profoundly impacts natural landscapes, altering species composition and ecosystem structure. In the Amazon, this process occurs amid large areas of native forest, which may favor biodiversity conservation in urban surroundings. Among tropical vertebrates, ba...

Variation in apparent wood density of Tachigali vulgaris as affected by tree diameter, height, forking, and soil conditions in Amazonian plantations

Abstract Tachigali vulgaris has potential for energy purposes in the Amazon, but the relationship between several silvicultural factors and wood quality requires further investigation. This study evaluated the variation in the apparent density of T. vulgaris wood in two pure plan...

Assessing fish diversity in the Amazon: The impact of primers and reference libraries in eDNA surveys

Abstract Selecting primers for DNA amplification poses a challenge in environmental DNA (eDNA) studies, particularly in biodiverse tropical ecosystems. Researchers must balance taxonomic coverage, primer specificity, and study feasibility when choosing between a single primer pai...

Habitat insularization alters taxonomic and functional beta diversity of understorey birds in Amazonian forest islands

Abstract Habitat fragmentation can profoundly alter the composition of biological communities, modifying patterns of beta diversity among areas. These effects are manifested through different components of beta diversity: differences in richness, which reflect variation in specie...