Publications by authors named "Marcelo Fernandes"

Most of the rapid inhibitory neurotransmission in the brain is mediated through activation of the γ-aminobutyric acid (GABA) type A (GABA) receptor, which is a ligand-gated ion channel. GABA receptor activation via GABA binding allows for an intracellular influx of Cl ions, thus inducing cellular hyperpolarization. Each GABA receptor consists of a combination of five subunits, and several subunits have been proposed as biomarkers and therapeutic targets in cancer.

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Article Synopsis
  • - Changes in epigenetic processes like histone acetylation are important for the function and progression of pediatric brain tumors, with drugs like valproic acid (VPA) showing potential as anticancer therapies by inhibiting histone deacetylases (HDACs).
  • - VPA treatment resulted in reduced viability of medulloblastoma (MB) cells, induced cell cycle arrest, and altered gene expression related to oncogenes and differentiation, alongside morphological changes that suggest neuronal differentiation.
  • - The effects of VPA on MB cells included modifications in histone acetylation patterns that correlated with patient outcomes, suggesting its potential to influence clinical prognosis by targeting stemness and differentiation in specific MB subgroups.
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Background: Global pediatric healthcare reveals significant morbidity and mortality rates linked to respiratory, cardiac, and gastrointestinal disorders in children and newborns, mostly due to the complexity of therapeutic management in pediatrics and neonatology, owing to the lack of suitable dosage forms for these patients, often rendering them "therapeutic orphans". The development and application of pediatric drug formulations encounter numerous challenges, including physiological heterogeneity within age groups, limited profitability for the pharmaceutical industry, and ethical and clinical constraints. Many drugs are used unlicensed or off-label, posing a high risk of toxicity and reduced efficacy.

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Purpose: In this study, we present DeepVirusClassifier, a tool capable of accurately classifying Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) viral sequences among other subtypes of the coronaviridae family. This classification is achieved through a deep neural network model that relies on convolutional neural networks (CNNs). Since viruses within the same family share similar genetic and structural characteristics, the classification process becomes more challenging, necessitating more robust models.

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This work proposes an implementation of the SHA-256, the most common blockchain hash algorithm, on a field-programmable gate array (FPGA) to improve processing capacity and power saving in Internet of Things (IoT) devices to solve security and privacy issues. This implementation presents a different approach than other papers in the literature, using clustered cores executing the SHA-256 algorithm in parallel. Details about the proposed architecture and an analysis of the resources used by the FPGA are presented.

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Retinoic acid (RA) regulates stemness and differentiation in human embryonic stem cells (ESCs). Ewing sarcoma (ES) is a pediatric tumor that may arise from the abnormal development of ESCs. Here we show that RA impairs the viability of SK-ES-1 ES cells and affects the cell cycle.

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  • Rapid neuronal inhibition in the brain involves GABA activation of its receptors, with specific gene subunits linked to aggressive medulloblastoma, yet their role in gliomas remains unclear.
  • This study analyzed GABA receptor subunit gene expression in gliomas using data from the French and TCGA-LGG datasets, finding that higher expression correlates with better overall survival in patients.
  • The results suggest that down-regulation of GABA receptors may promote glioma progression, indicating potential for GABA receptors as therapeutic targets.
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  • Gliomas are the most common type of central nervous system tumors, significantly impacting both adults and children, with glioblastoma (GBM) being the most critical and aggressive form in adults with a poor survival outlook.
  • The protein CD114 acts as a receptor related to granulocyte colony stimulating factor (GCSF) and is known as a cancer stem cell marker, showing higher expression in various cancers, including certain gliomas.
  • Our research indicates that higher levels of CD114 mRNA in gliomas, particularly astrocytomas and GBM, correlate with worse overall survival (OS) for patients, suggesting that CD114 could serve as a potential prognostic marker for GBM.
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A high risk patient with evisceration underwent to abdominal wall reconstruction without mesh or drains. We present a case of a 62 years-old female patient with a significant medical history of Wilson's disease-related hepatopathy Child-Pugh class B classification, sequelae of a stroke, and relevant surgical background including total hysterectomy, oophorectomy, and Hartmann's procedure for ovarian neoplasm stage 3. The patient developed a large incisional hernia in the midline incision while undergoing Bevacizumab (Avastin) treatment for clinical oncology.

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Boyde et al. (2023) stated that Moura et al. (2021) did not explain how fleas generated cavities in armadillo osteoderms, which is wrongly stated, also presenting a misrepresentation of what is written about this in Moura et al.

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Purpose: To compare visual performance and photic visual disturbances of patients implanted with 2 different extended depth-of-focus (EDOF) intraocular lenses (IOLs) using mini-monovision.

Setting: Ambulatory surgical center at the University of São Paulo in Ribeirão Preto, Brazil.

Design: Prospective, examiner-masked, randomized clinical trial.

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Background: Systems of care have been developed across the United States to standardize care processes and improve outcomes in patients with ST-segment-elevation myocardial infarction (STEMI). The effect of contemporary STEMI systems of care on racial and ethnic disparities in achievement of time-to-treatment goals and mortality in STEMI is uncertain.

Methods: We analyzed 178 062 patients with STEMI (52 293 women and 125 769 men) enrolled in the American Heart Association Get With The Guidelines-Coronary Artery Disease registry between January 1, 2015, and December 31, 2021.

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One of the most remarkable features in sauropod dinosaurs relates to their pneumatized skeletons permeated by a bird-like air sac system. Many studies described the late evolution and diversification of this trait in mid to late Mesozoic forms but few focused on the origin of the invasive respiratory diverticula in sauropodomorphs. Fortunately, it is possible to solve this thanks to the boom of new species described in the last decade as well as the broad accessibility of new technologies.

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Background: In December 2019, the first case of COVID-19 was described in Wuhan, China, and by July 2022, there were already 540 million confirmed cases. Due to the rapid spread of the virus, the scientific community has made efforts to develop techniques for the viral classification of SARS-CoV-2.

Results: In this context, we developed a new proposal for gene sequence representation with Genomic Signal Processing techniques for the work presented in this paper.

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Background: Intravenous leiomyomatosis (IVL) is a rare, benign smooth muscle cell tumour that extends beyond the pelvis. These tumours grow within vascular channels and can progress to involve the heart and pulmonary vasculature.

Case Summary: A 44-year-old female initially presented to her primary care physician for subacute bloating.

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This work aimed to develop a real-time test platform for systems associated with the tactile internet area. The proposal comprises a master device, a communication channel and a slave device. The master device is a tactile glove (wearable technology) that works as a tactile interface based on vibratory feedback.

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Since December 2019, the world has been intensely affected by the COVID-19 pandemic, caused by the SARS-CoV-2. In the case of a novel virus identification, the early elucidation of taxonomic classification and origin of the virus genomic sequence is essential for strategic planning, containment, and treatments. Deep learning techniques have been successfully used in many viral classification problems associated with viral infection diagnosis, metagenomics, phylogenetics, and analysis.

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The origin of the air sac system present in birds has been an enigma for decades. Skeletal pneumaticity related to an air sac system is present in both derived non-avian dinosaurs and pterosaurs. But the question remained open whether this was a shared trait present in the common avemetatarsalian ancestor.

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Tactile internet applications allow robotic devices to be remotely controlled over a communication medium with an unnoticeable time delay. In bilateral communication, the acceptable round trip latency is usually 1 ms up to 10 ms, depending on the application requirements. The communication network is estimated to generate 70% of the total latency, and master and slave devices produce the remaining 30%.

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COVID-19, the illness caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) virus belonging to the family, a single-strand positive-sense RNA genome, has been spreading around the world and has been declared a pandemic by the World Health Organization. On 17 January 2022, there were more than 329 million cases, with more than 5.5 million deaths.

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Stability of π-conjugated organic materials remains a critical issue for applications in which these materials and devices based on them are exposed to ambient conditions. Particularly, the initial steps of the reversible and irreversible degradation by molecular oxygen exposure are still not fully explored. Here we present a theoretical study using density functional theory (DFT) to investigate the oxygen effects on the electronic properties of poly(3-hexylthiophene-2,5-diyl) (P3HT).

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In bioinformatics, alignment is an essential technique for finding similarities between biological sequences. Usually, the alignment is performed with the Smith-Waterman (SW) algorithm, a well-known sequence alignment technique of high-level precision based on dynamic programming. However, given the massive data volume in biological databases and their continuous exponential increase, high-speed data processing is necessary.

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Objectives: to analyze factors associated with the quality of life of multi-professional health residents.

Methods: cross-sectional and analytical design, carried out with 94 residents who answered a questionnaire containing general data, the Maslach Burnout Inventory, the Self Reporting Questionnaire, and the World Health Quality of Life. Data was submitted to multiple linear regression, considering p < 0.

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Tactile Internet (TI) is a new internet paradigm that enables sending touch interaction information and other stimuli, which will lead to new human-to-machine applications. However, TI applications require very low latency between devices, as the system's latency can result from the communication channel, processing power of local devices, and the complexity of the data processing techniques, among others. Therefore, this work proposes using dedicated hardware-based reconfigurable computing to reduce the latency of prediction techniques applied to TI.

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Preterm birth (PTB) is a phenomenon that brings risks and challenges for the survival of the newborn child. Despite many advances in research, not all the causes of PTB are already clear. It is understood that PTB risk is multi-factorial and can also be associated with socioeconomic factors.

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