Publications by authors named "Bittencourt C"

Article Synopsis
  • The paper discusses the creation of sensors using tungsten trioxide nanowires with osmium oxide nanoparticles, fabricated through the aerosol-assisted chemical vapor deposition (AACVD) method.
  • Various techniques like FESEM, HR-TEM, and ToF-SIMS were used to analyze the morphological, chemical, and structural properties of the sensors.
  • The study evaluated the gas sensing capabilities of both pure and osmium-loaded tungsten trioxide sensors, demonstrating effective performance in identifying and quantifying gases like nitrogen dioxide, hydrogen, and ethanol.
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La-decorated BiOCO (BCO-La) microspheres are synthesized using a facile wet chemical strategy for sensing low-concentration nonanal (CHO) at room temperature. These BCO-La gas sensors are applied to evaluate agricultural product quality, specifically for cooked rice. The sensitivity of the BCO-6La sensor significantly surpassed that of the pure BCO sensor, achieving a response value of 174.

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Article Synopsis
  • - Nanostructured transition metal dichalcogenides, like tungsten disulfide (WS), have potential for use in sensors due to their unique structure and high surface area, but producing them in large quantities on various surfaces has been a challenge.
  • - This study successfully synthesized WS sheets in quantities of hundreds of milligrams using a chemical vapor deposition method, allowing for easy application onto different substrates through printing techniques.
  • - The WS sensors demonstrated excellent ammonia detection capabilities, achieving full response at 5 ppm and maintaining stability in humid conditions, while also showing high selectivity against other gases, with theoretical simulations supporting the experimental results.
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The objective of the present study was to evaluate the substitution of soybean meals by biodiesel co-products on the performance and nutrient balance of lactating cows on pasture. Twelve dairy cows (7/8 Holstein-Gir) in early lactation were included in this feeding trial. These animals had an average daily milk yield of 21.

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Ambient pressure X-ray photoelectron spectroscopy (APXPS) is combined with simultaneous electrical measurements and supported by density functional theory calculations to investigate the sensing mechanism of tungsten disulfide (WS)-based gas sensors in an dynamic experiment. This approach allows for the direct correlation between changes in the surface potential and the resistivity of the WS sensing active layer under realistic operating conditions. Focusing on the toxic gases NO and NH, we concurrently demonstrate the distinct chemical interactions between oxidizing or reducing agents and the WS active layer and their effect on the sensor response.

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Objective And Design: Kinin B1 receptor (B1R) has a key role in adipocytes to protect against obesity and glycemic metabolism, thus becoming a potential target for regulation of energy metabolism and adipose tissue thermogenesis.

Material Or Subjects: Kinin B1 knockout mice (B1KO) were subjected to acute induction with CL 316,243 and chronic cold exposure.

Methods: Metabolic and histological analyses, gene and protein expression and RNA-seq were performed on interscapular brown adipose tissue (iBAT) and inguinal white adipose tissue (iWAT) of mice.

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Article Synopsis
  • This study explores decorating vertically aligned molybdenum disulfide (MoS) nanostructures with silver nanoparticles and applying nitrogen functionalization to enhance its properties.
  • Nitrogen functionalization was performed using physical vapor deposition to introduce p-type characteristics in MoS, while silver nanoparticles formed three-dimensional structures on the surface during sputtering.
  • Characterization techniques like X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) confirmed the successful decoration and revealed that the deposition time influenced the size and distribution of the silver nanoparticles on MoS.
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Quantifying microplastics (MPs) in marine environments is challenging due to the complexities of differentiation from other materials. This study aims to distinguish petro-sourced plastic microfilaments from organic ones in environmental samples using scanning electron microscope coupled with energy dispersive X-ray (SEM-EDX) analysis. Therefore, 38 particles resembling MPs (PRMPs) from sediments and organisms in Madagascar were analyzed.

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Importance: Infections due to multidrug-resistant organisms (MDROs) are associated with increased morbidity, mortality, length of hospitalization, and health care costs. Regional interventions may be advantageous in mitigating MDROs and associated infections.

Objective: To evaluate whether implementation of a decolonization collaborative is associated with reduced regional MDRO prevalence, incident clinical cultures, infection-related hospitalizations, costs, and deaths.

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The impact of different synthesis parameters, such as thickness, postsynthesis annealing temperature, and oxygen gas flow rate, upon the electronic structure is discussed in detail in the present experimental investigation. X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge structure (XANES) spectroscopy techniques are used to evaluate the surface electronic properties along with the presence and stability of the CdO surface oxide in CdZnO ( = 0.4) composite thin films.

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Background: Environmental contamination is suspected to play an important role in Candida auris transmission. Understanding speed and risks of contamination after room disinfection could inform environmental cleaning recommendations.

Methods: We conducted a prospective multicenter study of environmental contamination associated with C.

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Background: Chagas disease (CD) is a parasitic disease that affects ∼300 000 people living in the United States. CD leads to cardiac and/or gastrointestinal disease in up to 30% of untreated people. However, end-organ damage can be prevented with early diagnosis and antiparasitic therapy.

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Background: Nursing home residents are at high risk for infection, hospitalization, and colonization with multidrug-resistant organisms.

Methods: We performed a cluster-randomized trial of universal decolonization as compared with routine-care bathing in nursing homes. The trial included an 18-month baseline period and an 18-month intervention period.

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In this study, we aimed to examine the impact of high endurance training on vascular health parameters and immune-endocrine responses against modified low-density lipoprotein (LDL) particles. This observational, cross-sectional study included high endurance-trained and healthy non-trained subjects. Vascular ultrasound was used to assess vascular health parameters based on carotid intima-media thickness and endothelial function (flow-mediated dilation).

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Healthy brains display a wide range of firing patterns, from synchronized oscillations during slow-wave sleep to desynchronized firing during movement. These physiological activities coexist with periods of pathological hyperactivity in the epileptic brain, where neurons can fire in synchronized bursts. Most cortical neurons are pyramidal regular spiking (RS) cells with frequency adaptation and do not exhibit bursts in current-clamp experiments (in vitro).

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Healthy brains display a wide range of firing patterns, from synchronized oscillations during slowwave sleep to desynchronized firing during movement. These physiological activities coexist with periods of pathological hyperactivity in the epileptic brain, where neurons can fire in synchronized bursts. Most cortical neurons are pyramidal regular spiking cells (RS) with frequency adaptation and do not exhibit bursts in current-clamp experiments ( ).

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An oil palm ( Jacq.) bud rod disorder of unknown etiology, named Fatal Yellowing (FY) disease, is regarded as one of the top constraints with respect to the growth of the palm oil industry in Brazil. FY etiology has been a challenge embraced by several research groups in plant pathology throughout the last 50 years in Brazil, with no success in completing Koch's postulates.

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Article Synopsis
  • CeO-TiO is a key mixed oxide known for its catalytic properties, particularly in photocatalysis, and this study explores a method to create 1D TiO nanostructures with CeO nanoparticles attached.
  • The precursor used was HTiO nanoribbons, which were produced from sodium titanate through ion exchange, with different cerium oxidation states (+3 and +4) applied to form the mixed oxide.
  • Calcination processes showed that cerium influences the conversion temperatures of HTiO to TiO-B and inhibits the formation of rutile while both +3 and +4 oxidation states of cerium were detected in all samples after calcination.
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Objective And Design: Circulating enzymatic activity and RAAS regulation in severe cases of COVID-19 remains unclear, therefore we measured the serum activity of several proteases as potential targets to control the SARS-CoV-2 infection.

Material Or Subjects: 152 patients with COVID-19-like symptoms were grouped according to the severity of symptoms (COVID-19 negative, mild, moderate and severe).

Methods: Serum samples of COVID-19 patients and controls were subjected to biochemical analysis and enzymatic assays of ACE2, ACE, DPPIV, PREP and CAT L.

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Nanostructured tungsten disulfide (WS) is one of the most promising candidates for being used as active nanomaterial in chemiresistive gas sensors, as it responds to hydrogen gas at room temperature. This study analyzes the hydrogen sensing mechanism of a nanostructured WS layer using near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) and density functional theory (DFT). The W 4f and S 2p NAP-XPS spectra suggest that hydrogen makes physisorption on the WS active surface at room temperature and chemisorption on tungsten atoms at temperatures above 150 °C.

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A novel reusable, high-compressible cotton regenerated cellulose/chitosan composite aerogel (RC/CSCA) was prepared using N-methylmorpholine-N-oxide (NMMO) as the green cellulose solvent, and glutaraldehyde (GA) as the crosslinking agent. The regenerated cellulose obtained from cotton pulp could chemically crosslink with chitosan and GA, to form a stable 3D porous structure. The GA played an essential role in preventing shrinkage and preserving the deformation recovery ability of RC/CSCA.

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Green chromium and red iron oxides are technically important pigments due to their high color intensity, good dispersibility in paints, and superior hiding power. We report on the synthesis of colored pigments of mixed oxides with a corundum-type structure. The pigments are obtained via the addition of coloring ions to boehmite from recycled metallic aluminium.

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Co-abietate and Cu-abietate complexes were obtained by a low-cost and eco-friendly route. The synthesis process used resin and an aqueous solution of CuSO/CoSO at a mild temperature (80 °C) without organic solvents. The obtained complexes are functional pigments for commercial architectural paints with antipathogenic activity.

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Article Synopsis
  • Developing strategies for green synthesis of new materials like blue pigments can help reduce the heat island effect caused by urbanization.
  • The study focuses on synthesizing blue pigments using recycled aluminum, with promising reflective properties for near-infrared radiation.
  • Characterization results show that these pigments have a specific crystalline structure and high solar reflectance, making them potential energy-saving additives for coatings.
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