JBCS

Proteomic and histochemical approaches aimed to identify the main biosynthetic pathways active in M. ilicifolia and provide evidences of differential compartmentalization of quinonemethide triterpenes and sesquiterpene pyridine alkaloids.

Molecular imprinting of polypyrrole on glassy carbon electrode modified with reduced graphene oxide and gold nanoparticles for the selective and sensitive determination of isoamyl alcohol.

Aquatic humic substances (AHSs) were extracted from two blackwater rivers (Negro and Carú) of the Amazon region and their complexation capacities (CC) with Ni^II, Cd^II and Pb^II were determined using ultrafiltration system with tangential flow. The seasonal influence was observed in AHS from Carú River, which during dry season showed low humification degree. AHS from Negro River had the highest CC for all metal ions tested. Transport, bioavailability and toxicity of the metal ions tested can be different in these blackwater rivers.

Molecularly imprinted polymer was synthesized on the surface of a triangular paper to provide enhanced analysis of methamphetamine in urine by paper spray ionization mass spectrometry.

A new approach using disposable pipette extraction technique to determine polycyclic aromatic sulfur heterocycles in lagoon water samples and leachate of solid petrochemical residues.

Cu-Co-containing cellulose-based carbon composite materials were formed by the matrix isolation method. Composites are highly active in the synthesis of alcohols from CO and H₂.

Staring Bay has been contaminated by Pb and Fe due to anthropogenic activities (industries and brackish ponds) around the bay.

A colorimetric method based on biuret assay was performed on wax printed polyester microzone plates for total serum protein analysis.

Nanoparticle of Fe₃O₄@Al₂O₃ was prepared through co-precipitation of magnetic iron oxide nanoparticle and followed by coating process of alumina on the surface of magnetic iron oxide nanoparticle.

Copper determination by graphite furnace atomic absorption spectrometry (GF AAS) in gasohol samples after extraction induced by emulsion breaking to separate the analyte from the organic phase.

Determination of mineral nutrient concentrations in healthy leaves and vegetative broom leaves in cocoa, relationship between disease and nutritional composition.

Modification of Morita-Baylis-Hillman adducts (MBHA) with 7-chloroquinoline giving derivatives with improved anticancer activity in relation to the MBHA previously reported and used.

Poly(3-hydroxybutyrate) (PHB) obtained from sugarcane was modified by reactive extrusion with poly(ε-caprolactone) (PCL), producing copolymer that can be electrospun, resulting in ultrafine fibrous mats.

Indoor and outdoor fine particulate matter (PM2.5) concentration and chemical composition were investigated in a classroom of a rural city in the Amazon region. The picture represents the main sources of PM_2.5, the infiltration of particles through the windows and their accumulation inside the classroom.

Energy level diagrams for Er³⁺ and Yb³⁺, detail of the thermally coupled level. The figure shows the up-conversion mechanism between Er³⁺ and Yb³⁺ lanthanides and the thermally coupled level that enables the application of the system as thermometer.

Seasonality and extraction method effects on chemical profile of Croton grewioides Baill. and isolation of a new triglycosylated flavonoid derivative.

The reactivity of phenyl radicals toward enol acetates could be explained by the influence of polar and steric effects in the early transition state.

This model presents an alternative way of discussing electronegativity based on how ions organize themselves, through the packing factor, and how electrons are transferred in the process of chemical bonding, through the charge factor.

The cumaru extract proved to be an excellent corrosion inhibitor. The high molecular weight fraction (HMWF) showed an inhibition efficiency better than the aqueous extract, which suggests that the macromolecules are responsible for inhibiting corrosion.

Molecular structure of 1,4-pentadien-3-one, (1E,4E)-1,5-diphenyl-2-(2,4-dinitrophenyl)hydrazone, analyzed by X-ray crystallography.

The biosorbent (BMC) produced from yellow mombin (Spondias mombin L.) was characterized and then used for removing chromium(VI) in an aqueous solution. The kinetic data were better suited to the Elovich model.

Five acetylene derivatives (1-5), including three unknowns (1, 3 and 4), were isolated from seeds of Porcelia macrocarpa (Annonaceae). All isolated compounds demonstrated selectivity towards intracellular amastigotes of Leishmania (L.) infantum, especially compounds 2-4 with superior activity of that determined to positive control miltefosine. These compounds could be considered as candidates in the development of new drugs for treatment of neglected diseases.