JBCS

Alumina-supported Ce_0.33Mn_0.67O₂ achieved a total combustion of n-hexane at a lower temperature than did the bulk sample with the same metallic surface density, probably due to the interaction of Ce⁴⁺ with Mn⁴⁺ species, which led to an active phase with easy reducibility and labile oxygen.

The phytochemical study of Tabebuia caraiba led to the isolation of triterpenes and iridoids. The chemical profile by HPLC/MS showed the presence of other constituents, however, most of the isolated compounds could not be detected.

This article access air emissions in two real asphalt paving occasions at the Londrina City. Particulate Matter (PM), Black Carbon (BC) and Polycyclic Aromatic Hydrocarbons (PAHs) are discussed. Health, environment and climate change are related.

Articles available about Endopleura uchi species is mainly address bark studies. For this work, we report the first chemical and biological experiments using the leaf and twig of the species.

Six known terpenes, five diterpenes and one sesquiterpene were isolated from the leaves of Xylopia laevigata (Annonaceae). Additionally, their cytotoxicities were  assessed by the Alamar blue assay. The isolated diterpenes are described here for the first time for X. laevigata.

Kinetic parameters for coffee husks pyrolysis were determined using thermogravimetric analyses and different kinetic models. The presence of six different reactions was identified using the model of parallel and independent reactions. This is the first work using this model for coffee husks pyrolysis.

The optimized conditions established in this study will help to extract the largest number of volatile compounds in roasted beef.

High concentrations of parabens were found in Brazilian baby wet wipes.

Samples were collected in two sites inside Rebouças tunnel to calculate the emission factors of urban vehicles in real conditions.

Application of immobilized trypsin in different forms and supports for modulation of proteomic assays.

A sensitive UPLC-MS/MS method for the determination of Docetaxel and metabolites (M1+M3) in human plasma samples was developed and validated. The method employs a liquid-liquid extraction and a reversed-phase separation with electrospray ionization.

Construction of an accessory coupled to the extruder for winding the filaments of 3D printer.

Pedagogical link-making among chemical concepts and a historical fact involving these concepts can contribute significantly to the engagement of students with the content and, as a result, with knowledge.

The PROFQUI was projected for high school teachers of chemistry. The objectives are to raise difficulties and propose perspectives for chemistry teaching based on the elaboration of innovative educational products for the different school contexts.

Anthropocene: the Atomic Age.

Wastewater-based epidemiology is an emerging and relatively inexpensive strategy for monitoring contagion curves in near real time and creating early warning systems, especially in regions where clinical trials are scarce