Universidade Federal de Ouro Preto

Phytochemical Screening and Protective Effects of Hancornia speciosa Leaf Extract Against Fatty Acid-Induced Lipotoxicity in HepG2 Cells

Hepatic steatosis is the hallmark of metabolic dysfunction-associated steatotic liver disease (MASLD), the most prevalent chronic liver disease worldwide. Lipotoxicity, resulting from excessive accumulation of fatty acids and bioactive lipid intermediates, is associated with incr...

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...

SCoRE-Layer: a structured method for relational analysis of results in scoping reviews.

INTRODUCTION: Scoping reviews are widely used to map the extent of the available literature and to organize the main concepts that structure a given topic. However, their results are usually presented as descriptive categories, with limited emphasis on how these dimensions appear...

“Buy the rumor, sell the fact”: political narratives and stock prices in an emerging equity market

Purpose This paper asks whether political narratives can generate large, temporary price movements in an emerging equity market, not fully explained by observable fundamentals and benchmark movements, using Taurus Armas S.A. (TASA4), Brazil's only listed firearms manufacturer, ar...

Effects of isolated and combined supplementation of caffeine and capsaicin on a self-paced 10-km running performance

Abstract Purpose To investigate the acute effects of isolated and combined caffeine and capsaicin supplementation on performance and physiological, perceptual, and subjective responses during a self-paced 10-km run. Methods This randomized, double-masked, placebo-controlled cross...

Characterisation of lithium-bearing minerals for dense media separation

Lithium-bearing minerals from a tantalite processing plant in Minas Gerais, Brazil, with a head grade of 1.06% Li 2 O, were characterised to evaluate the potential of dense medium separation for spodumene pre-concentration in the −850/+500 μm size fraction, selected to evaluate t...

Counterion-Mediated Humidity Modulation of Electronic Transport in Pristine MWCNT/TOCNF Composites

Abstract Humidity-driven electrical responses in carbon-cellulose composites are commonly attributed to matrix swelling. However, in TEMPO-oxidized nanocellulose (TOCNF), water uptake also releases Na+ counterions from carboxylate residues, enabling interfacial polarization via i...

Biofunctionalized hierarchical mesoporous zeolite 5A–maghemite hybrids for Cd(II) adsorption: Surface chemistry and interfacial binding mechanisms

Cadmium contamination of water requires adsorbents that combine high removal efficiency, rapid kinetics, and easy recovery after treatment. In this work, two families of biofunctional magnetic nanohybrids, MCZO and MCZ1, were prepared by combining zeolite 5A with γ-Fe 2 O 3 nanop...

Tailings piles and the Global Industry Standard on Tailings Management: evaluating the distribution of risks within the standard

Abstract Disasters involving tailings dams in Brazil have highlighted gaps in risk management and control systems, encouraging the adoption of alternatives such as dry-stacked tailings facilities. In this context, the Global Industry Standard on Tailings Management (GISTM) establ...

Lean management in a low-digitalization context: implementing manual time and motion analysis in a public hospital emergency department

Purpose This study aims to describe the challenges and adaptive strategies involved in implementing a manual chronoanalysis instrument at the entrance of a medium-sized public emergency department in a nondigital context, from a Lean in Emergency Care perspective. Design/methodol...

Effect of the area on the performance of low impact development practices placed at catchment-scale under long-term simulation

Abstract Previous studies highlighted the effectiveness of Low Impact Development (LID) practices in reducing urban surface runoff, but their long-term performance at different implementation areas remains unclear. This study addresses this gap by simulating surface runoff reduct...

The Colina do Horto Geosite in the Araripe UNESCO Global Geopark, Brazil: Archaeology of the Contemporary and Cultural Landscape

Abstract This article analyzes the Colina do Horto Geosite, located within the Araripe UNESCO Global Geopark (Northeastern Brazil), through an integrated approach that combines geodiversity, archaeology, and cultural landscape approaches, grounded in the theoretical and methodolo...

Development of magnesium silicate hydrate (M-S-H) cements from a low-purity magnesium oxide source

The performance of a low-purity magnesium oxide (magnesia) source for the synthesis of magnesium silicate hydrate (M-S-H) cements was evaluated. Magnesia-rich precursors were produced from a raw magnesite containing significant levels of impurities (e.g. silicon dioxide, aluminiu...

Decoding complex gold mineralization in the Pitangui Greenstone Belt, Brazil: overprinting systems revealed by pyrite trace elements and sulfur isotopes

Tracing the sources of metals and sulfur in orogenic gold deposits remains debated due to the diversity of these systems. This study constrains the origin and evolution of mineralizing fluids through trace element and sulfur isotope (δ34S) analyses of pyrite from the Papagaios go...

Phylogeography of the endangered ant species Atta robusta Borgmeier, 1939 (Formicidae: Myrmicinae): insights into genetic structure, demographic history, and conservation priorities

Abstract Atta robusta is a narrow endemic leaf-cutting ant restricted to restinga habitats along Brazil’s southeastern coast. Despite its conservation status, little is known about its evolutionary history and genetic structure. Here, we investigate patterns of genetic variation...

Activity-based accident analysis: from blame attribution to organizational learning

This paper proposes Activity-Based Accident Analysis (ABAA) as a methodological framework that integrates organisational accident analysis with the reconstruction of situated work activity. While systemic approaches have advanced the understanding of organisational accidents, the...

Using time-dependent density functional theory to simulate UV-visible absorption spectra and calculate corrected emission energies of 2,1,3-benzotelluradiazoles

Abstract Luminescent benzochalcogenadiazole liquid crystals have attracted considerable interest owing to their combination of photophysical and mesomorphic properties. These compounds consist of central heterocycles containing oxygen, sulfur or selenium, linked to phenyl groups...

The Effects of Fiscal Policy on Forest Cover Conditions and Dynamics: Evidence from Tanzania

Forest cover conditions in Tanzania remain predominantly negative, with significant implications for biodiversity, rural livelihoods, and climate stability. Despite national forest management policies, traceability systems, afforestation programs, REDD+ initiatives, and the Natio...

An outer approximation-Benders’ decomposition approach for the competitive facility location problem with limited choice rule

Abstract In this study, we propose a new exact approach to the competitive facility location problem with a limited choice rule. The problem consists in locating facilities to capture a market share that maximizes the profits of a new company entering into a competitive marketpla...