1,674 results match your criteria: "Federal University of Maranhao.[Affiliation]"

Dichloro(l-histidine)copper(II) crystal ([Cu(l-His)Cl] complex) was obtained by the slow evaporation method and characterized concerning its thermal stability, phase transformations, and electronic and vibrational properties. X-ray diffraction (XRPD) confirmed that this complex crystallizes with an orthorhombic structure (222 space group). Thermal analyses (TG and DTA) demonstrate stability from ambient temperature up to 460 K, followed by a phase transition from the orthorhombic structure to the amorphous form around 465 K, as confirmed by temperature-dependent XRPD studies.

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  • Penile squamous cell carcinoma (PSCC), mainly affecting poorer regions, has risk factors such as low socioeconomic status, phimosis, and HPV infection, but its immune response and treatment options are still unclear.
  • The study collected data from 30 PSCC patients (mostly HPV-positive) and 19 healthy donors to analyze immune cell behavior and utilize a tumor-mimicking environment created from HPV-positive tumor cultures.
  • Results indicated that HPV-positive tumors had fewer T lymphocytes and that dendritic cells in these patients were less mature and had lower activation compared to healthy controls, potentially affecting the immune response and disease progression.
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GSTM1 and GSTT1 deletions in penile cancer are associated with TNM stage but not with HPV DNA status.

Pathol Res Pract

December 2024

Post-Graduate Program in Adult Health (PPGSAD), Federal University of Maranhão (UFMA), Av. dos Portugueses, 1966, São Luís, Maranhão 65080-805, Brazil. Electronic address:

Deletions of the GSTT1 and GSTM1 are associated with chemical carcinogenesis and genitourinary malignancies like bladder cancer, where they correlate with increased tumor aggressiveness. In uterine cervical lesions, GSTT1 and GSTM1 deletions have also been suggested to facilitate the persistence of human papillomavirus (HPV) infection and HPV-induced carcinogenesis. This work addresses the hypothesis that GSTT1/GSTM1 deletions are associated with presence of HPV DNA and aggressiveness in penile cancer, a rare malignancy with HPV+ and HPV- subtypes.

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  • The study investigated how the consumption of ultra-processed foods (UPF) relates to dental caries (decayed teeth) in adolescents, considering factors like muscle mass, bone mineral density, and oral hygiene habits as potential mediators.
  • Conducted with 2,515 adolescents aged 18-19, the findings revealed that higher UPF intake directly correlates with increased dental caries, with oral hygiene habits significantly influencing this relationship.
  • The study highlights the need for improved oral hygiene education, healthy eating practices, and equitable public policies in Brazil to prevent dental caries, especially in middle and low-income communities.
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Syngas enhancement for Fischer-Tropsch integration via solid oxide electrolyzer cell co-electrolysis with or without methane.

iScience

October 2024

LIPCAT (Laboratório de Intensificação de Processos e Catálise), Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro 21941-594, RJ, Brazil.

The transition toward a sustainable energy framework requires developing innovative methods for fuel generation that utilize renewable resources and decrease carbon footprints. Thus, the review overviews current advancements in solid oxide electrolysis cell (SOEC) technology, specifically focusing on its application in co-electrolysis processes to produce syngas with different H:CO ratios, essential for Fischer-Tropsch synthesis. It emphasizes the potential of integrating partial methane oxidation reaction into the electrolysis process.

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  • Otoliths play a crucial role in marine biology, aiding in studies related to fish metabolism, age, growth, and stock identification for sustainable management.
  • The research utilizes micro-computed tomography to analyze otolith density variations but notes a lack of methodologies for comparative studies, leading to the application of the Ball Mapper technique in this analysis.
  • This study emphasizes reducing computational costs through probabilistic sampling, validating sample representativeness, and uncovering significant correlations between age and network properties, showcasing the effectiveness of the Ball Mapper in processing tomographic images.
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In response to the COVID-19 pandemic, scientific authorities were routinely consulted by mainstream media outlets through interviews, statements and/or supporting images. In this framework, our goal in this study was to analyze the media representation of scientists in Brazil during the first year of this global public health crisis. To this end, we applied a research protocol and, using statistical techniques, quantitatively analyzed newscasts on the country's main TV news program, Jornal Nacional.

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This article aims to evaluate the sociodemographic determinants of ultra-processed foods (UPF) consumption in the Brazilian population ≥ 10 years of age. The study used data from the personal and resident food consumption module of the Family Budget Surveys, grouping foods according to the NOVA classification of food processing. The classification and regression tree (CART) was used to identify the factors determining the lowest to highest percentage participation of UPF in the Brazilian population.

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Background/objectives: Arboviruses, transmitted by mosquitoes like , pose significant public health challenges globally, particularly in tropical regions. The rapid spread and adaptation of viruses such as Dengue, Zika, and Chikungunya have emphasized the need for innovative control methods. Essential oils from plants, such as (Gardner) Sch.

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  • - Type 1 diabetes (T1D) is a chronic condition where the immune system attacks beta cells in the pancreas that produce insulin; C-peptide, released alongside insulin, is a helpful marker for evaluating pancreatic function due to its longer lifespan in the body.
  • - A study involving 95 T1D patients focused on the levels of C-peptide and its relationship with factors like age, revealing that nearly 30% had some remaining insulin secretion, primarily linked to their age at diagnosis.
  • - No significant differences were found in metabolic control or microvascular complications based on C-peptide levels, and it was noted that ancestry did not affect residual C-peptide function; future research should explore additional factors like HLA and pancreatic auto
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Introduction: Pituitary adenomas (PAs) are benign tumors with high prevalence and, occasionally, aggressive course. The tumorigenesis of these lesions is not completely understood at the molecular level. BAK1 and BAX proteins play fundamental roles in apoptosis and seem to interact with VDAC proteins, whose expressions have been markedly altered in cancer, impacting their prognosis.

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Although heart rate variability (HRV) is a valid method to evaluate the behavior of the autonomic nervous system in individuals with temporomandibular disorder (TMD), the measurement can easily be biased by factors involving the analysis methodology, such as the removal of artifacts. Therefore, the objective of this investigation is to evaluate the impact of using different levels of threshold-based artifact correction to process HRV data in individuals with TMD. This cross-sectional observational study.

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The biodiversity of Brazil provides an excellent climate and favorable pollination conditions for L., especially in the Eastern Amazon region, which boasts vast floral wealth, including an abundance of açaí () flowers and fruits. In the present study, seven types of honey were evaluated: three containing floral nectar from açaí (Açaí honey) collected in the Eastern Amazon region (Açaí honey from Breu Branco (AH1 and AH2) and Açaí honey from Santa Maria (AH3), both from the state of Pará, Brazil) and four honeys from different regions of Brazil (Aroeira honey from Minas Gerais, Cipó-Uva honey from Distrito Federal, Mangue honey from Pará, and Timbó honey from Rio Grande do Sul).

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A global chromoblastomycosis strategy and development of the global chromoblastomycosis working group.

PLoS Negl Trop Dis

October 2024

Department of Infectious Diseases and Infection Control, Universidade Federal do Maranhão, Maranhão, Brazil.

Chromoblastomycosis, an implantation mycosis, is a neglected tropical disease that causes decreased quality of life, stigma, and disability. The global burden of disease is unknown and data on disease epidemiology and outcomes are severely limited by a lack of access to needed diagnostic tools and therapeutics. The World Health Organization outlined targets for chromoblastomycosis in the Road Map for Neglected Tropical Diseases 2021-2030, but little progress has been made in initiating and implementing an effective control program globally.

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Diabetes Mellitus (DM) is a disease characterized by high blood glucose levels, known as hyperglycemia. Diabetes represents a risk factor for the development of neurodegenerative diseases, such as Alzheimer's Disease (AD), one of the most prevalent neurodegenerative diseases worldwide, which leads to progressive mental, behavioral, and functional decline, affecting many brain structures, especially the hippocampus. Here, we aim to characterize the ultrastructural, nanomechanical, and vibrational changes in hyperglycemic hippocampal tissue using atomic force microscopy (AFM) and Raman spectroscopy.

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  • - Multiple myeloma (MM) is a rare cancer often treated with bisphosphonates, which help reduce bone loss and prevent complications, and this study focused on identifying imaging patterns related to this treatment in MM patients.
  • - The study reviewed six research articles involving 669 MM patients, of which 447 were treated with bisphosphonates like pamidronate and zoledronate; many patients developed medication-related osteonecrosis of the jaw (MRONJ), primarily affecting the mandible with specific radiographic features.
  • - The findings highlight distinct radiographic patterns of bone lesions in MM patients undergoing bisphosphonate therapy, which are important for early diagnosis and improving treatment outcomes.
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Purpose: The aim of this study was to investigate the impact of malocclusion and oral habits on oral health-related quality of life and sleep disturbance in young adults.

Methods: A cross-sectional study was conducted with a sample of 213 young adults aged 18-30 years. Dental occlusion data were assessed through clinical examination.

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Impact of gluten-free diet (GFD) on some of cardiovascular risk factors: a systematic review and meta-analysis.

J Nutr Sci

September 2024

Pediatric Gastroenterology and Hepatology Research Center, Pediatrics Centre of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran.

A gluten-free diet (GFD) may have a stronger potential impact on reducing cardiovascular (CV) risk factors, according to research evidence. We investigated the impact of GFD on CV risk variables by doing a systematic review and meta-analysis for this reason. We conducted a thorough database search starting on January 1, 2000, and ending on July 12, 2022.

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Laser acupuncture regulates energy flow and restores body fluid metabolism. To evaluate the effects of the laser acupuncture protocol (LAP) on hepatic and renal metabolism in sedentary people. Longitudinal, double-blind, and randomized clinical trial with 29 participants, adults, both sexes, sedentary, without pre-existing metabolic diseases, subdivided into control and laser groups.

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The production of açaí seed waste from the commercial and extractive exploitation of the Euterpe oleraceae palm tree is a serious problem that contributes to environmental contamination and production of greenhouse gases, a fact that suggests the need for an environmentally correct destination for this waste produced on a large scale. To this end, this study was conducted to evaluate the potential of acaí seed biochar (BCA) in mitigating the toxic effects of copper in Brazilian mahogany plants, analyzing biometrics and gas exchange. The experimental design was in randomized blocks, with five blocks, in a 4 × 3 factorial scheme, corresponding to the control (without Cu) and three concentration of Cu (200, 400, and 600 mg Cu kg) and three levels of BCA (0%, 5% and 10%) proportional to the amount of soil in the pots, totaling sixty experimental units.

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Background: Noncommunicable diseases (NCDs) predominantly affect adults, but pathophysiological changes begin decades earlier, as a continuum, with initial events apparent in adolescence. Hence, early identification and intervention are crucial for the prevention and management of NCDs. We investigated the complex network of socioeconomic, behavioral, and metabolic factors associated with the presence of NCD in Brazilian adolescents.

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In this work, we developed a smart drug delivery system composed of poly (ethylene glycol)--poly (ε-caprolactone) (PEG-PCL)-based polymersomes (Ps) loaded with doxorubicin (DOX) and vemurafenib (VEM). To enhance targeted delivery to malignant melanoma cells, these drug-loaded nanovesicles were conjugated to the oxalate transferrin variant (oxalate Tf) and incorporated into three-dimensional chitosan hydrogels. This innovative approach represents the first application of oxalate Tf for the precision delivery of drug-loaded polymersomes within a semi-solid dosage form based on chitosan hydrogels.

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Background: Surgical site infection (SSI) remains a challenge in healthcare, contributing to prolonged hospital stays, increased healthcare costs, and adverse patient outcomes, including mortality. Effective preoperative skin disinfection interventions, such as povidone-iodine (PVI) and chlorhexidine (CHG), are widely used but their efficacy remains debated. To address this gap, this meta-analysis aims to evaluate the efficacy of PVI and CHG.

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