Universidade Federal do Pará

Atmosphere-Driven Phase Engineering in MoO x : From α-MoO3 Microbelts to MoO2 Revealed by Atomic-Scale Hyperfine Probes

Abstract This work reports a comprehensive investigation of the structural, morphological, and local-scale evolution of molybdenum oxides (MoOx) derived from a chelated precursor obtained via thermal decomposition of molybdenum(II) acetate. By systematically controlling annealing...

Geogenic controls and anthropogenic inputs on the seasonal hydrogeochemical variability of the Paraopeba River basin, Brazil

Abstract This study investigates the combined effects of geology, land use and land cover, hydrological seasonality, and disturbance history on the hydrogeochemistry of surface waters in the Paraopeba River Basin (PRB), located in Minas Gerais State, southeastern Brazil, and form...

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...

Retrohepatic inferior vena cava injuries: surgical anatomy and operative maneuvers the trauma surgeon needs to know

Injuries of the retrohepatic inferior vena cava are among the most lethal encountered in abdominal trauma. They are anatomically unforgiving: the retrohepatic cava is a short venous segment embedded within the liver, tethered by numerous fragile tributaries that drain downstream...

High Doses of N ‐Acetyl‐ P ‐Aminophenol Cause Acute Changes in Electroencephalographic and Electrocardiographic Activities in Wistar Rats

ABSTRACT N ‐acetyl‐ p ‐aminophenol (APAP), or acetaminophen, is the most prescribed analgesic and antipyretic, even used in association with other drugs. Because it is easily bought in drugstores, much evidence about its toxic effects is known due to high doses or continuous use,...

From Conflict to Conservation: The Medicinal Use of Eunectes murinus Fat in the Amazon Floodplain

Phytotherapy and zootherapy remain widely used by traditional populations, often as the only alternative due to limited access to pharmacies and hospitals. This scenario has contributed to the development of generational knowledge about the medicinal properties of plants and anim...

Antifungal Activity of Essential Oils from Five Piper Species against Botrytis cinerea from Strawberry

Abstract Strawberry (Fragaria × ananassa Duch.) is susceptible to several fungal diseases, such as gray mold, caused by Botrytis cinerea, that compromise fruits during and after harvest. Disease control usually involves synthetic fungicides; however, the frequent selection of iso...

Spatial distribution and spatiotemporal clustering of AIDS notifications among men in Brazil, 2014–2023: an ecological study

This study aimed to analyse the spatial distribution and spatiotemporal clustering of AIDS notifications among men in all 5570 Brazilian municipalities between 2014 and 2023. Using an ecological design, data on AIDS notifications among men (≥ 13 years) were retrieved from Brazil’...

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...

Meta-analysis of NPC2-mediated cholesterol transport in human cancers as a prognostic biomarker with therapeutic implications

NPC2 is a lysosomal cholesterol transporter involved in intracellular lipid trafficking and cholesterol homeostasis, processes that have been increasingly implicated in cancer biology. To quantify the clinical impact of NPC2 expression across human malignancies, we analyzed survi...

Cladocerans and macrophytes: network and resistance to extinctions

Abstract Macrophytes are important in structuring various aquatic communities, particularly cladocerans. Our findings highlight that plant structural complexity and functional life forms (specifically free-floating and submerged species) act as key drivers of interaction density...

Cold Quantum Gravimeters: An Introduction for Geophysicists

Abstract This paper aims at providing an accessible introduction to cold quantum gravimeters tailored for geophysicists. We do not focus here on geophysical applications, as these are already well known to geophysicists, but rather provide a pedagogical exposition of the quantum-...

Mining waste into environmental remediation: sustainable Mg/Fe-LDH derived from Amazonian copper residues for efficient Congo red removal

Abstract The improper disposal of mining residues poses significant environmental challenges, particularly in ecologically sensitive regions such as the Amazon. In this study, Amazonian copper mining residues (ACMR) were employed as a sustainable source of ferric iron (Fe 3 ⁺) fo...

Warming causes higher bilateral asymmetry in aquatic hemipterans from geothermal streams

Abstract Increase in temperature associated with climate change may alter community structure and disrupt developmental stability in ectothermic organisms. Using a natural geothermal gradient (20.6–40.3 °C) in Neotropical streams in central-western Brazil, we investigated how war...

A cytogenetic analysis with chromosome painting in typical antbirds (Passeriformes, Thamnophilidae) and an inference on chromosome evolution in Passeriformes

Abstract The typical antbirds (Passeriformes, Thamnophilidae) are a monophyletic group comprising 225 species in 45 genera, primarily distributed in the lowland forests of the Neotropics. There is limited karyotypic information for this bird family, including chromosome morpholog...

Scalar fields, impurities and supersymmetry

Abstract We develop a rigid $$\mathcal {N}=(1,1)$$ N = ( 1 , 1 ) superspace formulation for multifield scalar models coupled to localized impurities through spurion superfields in two-dimensional spacetime. The spurionic completion gives a manifestly supersymmetric action and pro...

Gross Agricultural Emissions and Unequal Mitigation Pathways in the Brazilian Legal Amazon: Implications for Climate Justice and the Sustainable Development Goals

ABSTRACT Climate mitigation policies in the Brazilian Legal Amazon have largely focused on aggregate or net emissions, providing limited evidence on how gross agricultural emissions reveal the intensity of productive emission sources independently of carbon removals. This gap con...

Extraction of Phenolic Compounds from the Pulp of Myrciaria dubia Using Eco-Friendly Solvents: Extraction Kinetics and Determination of Mass Transfer and Thermodynamic Parameters

Abstract Sustainable extraction of bioactive compounds from Amazonian fruits is essential for green chemistry, but integrated kinetic, thermodynamic, economic, and sustainability assessments for Myrciaria dubia (camu–camu) phenolics remain limited. This study investigated phenoli...

Factors associated with tuberculosis-attributed mortality in the Brazilian Amazon: a population-based retrospective cohort study with survival and competing-risk analyses

Abstract Background Tuberculosis mortality remains a major public health challenge in the Brazilian Amazon, where clinical vulnerability, social inequities, and heterogeneous access to healthcare may contribute to poor outcomes. This study aimed to identify factors associated wit...

A systematic review and individual patient data meta-analysis to determine the effect of primaquine dose on efficacy, tolerability and safety in uncomplicated Plasmodium vivax malaria in Latin America

Background Primaquine is widely used to prevent relapses of Plasmodium vivax malaria, but the optimal dose in Latin America is unknown. We undertook a systematic review and individual patient data meta-analysis to investigate the efficacy, tolerability and safety of different pri...