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'The global importance of ethanol, as a renewable fuel, encourages the improvement of its production. In Brazil, obtaining anhydrous ethanol by azeotropic, extractive, and adsorption systems through molecular sieves stand out, and its particularities will be presented

Measurements of hydrodynamic diameter, rheology and zeta potential demonstrated that xanthans behave like polyelectrolytes that undergo different levels of aggregation in solution, at two critical concentrations, named overlap concentration (c* ≈ 0.1 g/L) and aggregation concentration (c** ≈ 0.75 g/L). Until c*, xanthans suffer a sharp aggregation, which is stabilized between c* and c** critical concentrations. Above c**, they form 3D molecular tangles

We dried the material until 12% moisture content and, we made the proximate analysis and the briquettes. It measured the volumetric expansion, mechanical resistance and durability test.

Sisal fibers were covered with lignosulfonate and used as reinforcement in fiber cement composites. The preparation of composites was done simulating the Hatschek process. The physical and morphological properties of the composites were evaluated. The proposed treatment was effective in improving the performance of fiber cement composites

The process of detecting latent fingerprints using chemical and physical developers followed by their analysis by software in order to be used as criminal evidence

M. oleifera cultivated in Teresina-PI had its ethanolic and hexane extracts of its leaves investigated through the techniques of GC-EM and HPLC to identify the secondary metabolites present in this plant.

The enzymatic extract of Ananas comosus was immobilized by entrapment in polyacrylate microcapsules, for further esterification of rac-butan-2-ol in 2-acetoxybutane, using CG/MS as structural elucidation equipment and 2³ Factorial Planning as a tool for optimization of conversion rates

The presence of alachlor in surface waters, in a region with suspected contamination by pesticides, was proven after the development and validation of an analytical method consisting of SPE followed by HPLC/DAD. It was also possible to verify the persistence of alachlor.

Radon is a natural gas that in poorly ventilated environments can pose risks to public health. This work sought to carry out a review of the natural radioactivity resulting from indoor radon in these environments in Brazil, highlighting the information gap in some Brazilian regions

Oxidation of the main unsaturated fatty acids in fish meat at low storage temperature

Niobium is a metal whose major reserves are found in Brazil. The majority of articles dealing with niobium employs niobium pentachloride, however, several other Nb-catalysts are currently available, which are more selective, stable and even water-soluble

The non-pharmacological measures of containment of the propagation of the new Coronavirus SARS-CoV-2 (causer of COVID-19) negatively impacted the teaching of Chemistry, Biology, and Physics in basic education in Rio de Janeiro

The article apply the AHP Method to assist in the decision making of the best methodology for determining contaminants emerging in surface water, comparing SPE and LC-MS/MS, X-Ray Fluorescence Spectrometry and Raman Spectroscopy

The review presents structures, properties, and synthesis methods of ionic liquids, as well as their applications in the fractionation and conversion of biomass

2-mercaptobenzimidazole (2-MBI) derivatives are compounds that present essential biological activities such as antimicrobial, antitumor, antiviral, and others. This work presents the main syntheses of 2-MBI derivatives with antibacterial activity described in the literature in the last decade

This work describes the potential of LASSBio-1587, an N-acylhydrazone, to attenuate the nociception and inflammation in mice using the following methodologies: acetic acid induced abdominal writhing test, formalin test and migration of leukocytes in the peritoneal cavity. It was observed that this molecule presents antinociceptive and anti-inflammatory activity