JBCS

Using the development of a biodiesel process, this paper discusses the hard way to transform science in technology. It is described the initial development in a laboratory scale and the long way to achieve a laboratory pilot plant scale

Natural Brazilian clay-based catalysts were prepared, characterized, and their catalytic activity was assessed in esterification reactions. The reactions were performed without a Dean-Stark apparatus or co-solvent, at atmospheric pressure in a short reaction time. The acid-activated clays provided good yields for various carboxylic acids and alcohols

Neutral oximes, with better hematoencephalic barrier permeation than cationic oximes commercially used as chemical warfare defense agents, display capacity to reactivate human acetylcholinesterase inhibited by neurotoxic organophosphorus compounds

Six types of resins derived from glycerol were produced and resulting in oligomers with average molecular weights ranging from 1800-2800 Da and polydispersity indexes (PDI) from 1.3 to 1.8. Resins derived from carboxylic acids are thermally more stable than resins derived from formaldehyde

The plant species Mabea fistulifera Mart.

Two new flavonoids, 3,4,10-trihydroxy-9-methoxypterocarpan (1) and 2',4'-dihydroxy-4-methoxy-β-hydroxychalcanonol (2), were isolated from Platymiscium floribundum in addition to several flavonoids and coumarins

This study reports the advantages presented by the microencapsulation of products obtained from P. pubescens on the antinociceptive activity provided by the crude extract and isolated furanditerpenes

This study is applied to the uranium extraction from Korean domestic low grade ore leach liquors using Alamine 336 as extractant. It has successfully achieved 99.83% uranium recovery with zero interfere

Sampling points with available ²¹⁰Pb based sedimentation rates data in the literature and additional data obtained in the present work (BG sampling points)

Three new 8-O-4'-neolignans, fargesiphenols A-C (1-3), together with six known neolignans, were isolated from the flower buds of Magnolia fargesii. The structures were elucidated by spectroscopic methods, including extensive 1D and 2D-NMR techniques. Compounds were also tested for their anti-HIV-1 activities and cytotoxicities

Muscular mercury and selenium were assessed in cutlassfish from three coastal areas presenting different environmental conditions in Southeastern Brazil. Regional differences were observed in mercury concentrations and Se:Hg molar ratios. A large excess of selenium in relation to mercury was observed. Cutlassfish is suitable for human consumption

The complexation behavior of aqueous precursor formulations with a minimal amount of organic compounds was studied for the preparation of YBa₂Cu₃O_7-x superconducting perovskites. The products were obtained from inexpensive and easily available chemicals and displayed good long-term stability together with excellent application properties

LiFePO₄ was synthesized with both carbon-coating and Mn-doping by a simple solid-state reaction. The as-prepared particles presented a size range of 100-200 nm and uniform carbon webs. The LiFe_0,9Mn_0,1PO₄/C composite delivered initial discharge capacities of 154.1 and 94 mA h g^-1 at current rates of 0.1 and 10.0 C (C = 170 mA g^-1), respectively

Cluster models employed in the atomic charge distribution and HOMO-LUMO energy gap analysis. This work presents evidence for the unsynchronized resonance of covalent bonds in the superconducting state, according to predictions of the RVB theory developed by L. Pauling

Ratio spectra-CWT for determination of ions, based on complexation with PAN, was introduced and advantage of CWT for simultaneous determination of ions was examined. The method was validated by determination of ions in tea, barley, spinach, chocolate and milk powder samples

Monitoring of heavy metal concentrations by stripping voltammetry with bismuth film microelectrode in the Cananéia-Iguape Estuarine-Lagoon region (São Paulo State, Brazil)

Target analytes were extracted into ionic liquid from aqueous phase. Extraction, concentration and purification were done in one-step. After centrifugation, ionic liquid phase was sedimented at the bottom of the tube

Molecular dynamics simulations of the complex involving short DNA fragments and proflavin and phenanthroline substituted Tröger bases point out to a mixed binding mode, with one substituent intercalated and minor groove binding for the other

Roasted and ground 38 commercial coffees were studied for assessing the addition of robusta coffee in commercial products which are blends of two coffee species (arabica and robusta). Thermostable parameters (caffeine, kahweol, cafestol) had high discriminative potential between the species. The use of the parameters kahweol/cafestol and caffeine/kahweol ratios was suggested

Micrographs of polarized light of the pitches submitted to the thermic treatment and other techniques for evaluation of the mesophase evolution

The experimental results show that there is an increase in the removal rate of organic carbon depending on the concentration of Zn2+. Due to the increased persistence of the semiquinone radical of catechol in aqueous solution, Fe2+ is regenerated for a longer time and more HO. radicals are generated

Decalin was used as a test reactant to study the formation of aromatics in liquid products of the FCC process. Isomerization, ring opening and direct hydrogen transfer were the most important reactions at very short contact times. Diffusion restrictions did not prevail in FCC catalysts with different accessibilities. A mechanism was proposed for the formation of aromatic hydrocarbons

Soil samples at the vicinity of Antarctic scientific stations are clearly impacted by Cu and Zn deposition, related to diesel-generator burning

Chemoenzymatic resolution of (±)-mandelonitrile produced the (S)-mandelonitrile acetate with 92% ee, enantiomeric excess) and 35% yield, and the unreacted (R)-mandelonitrile was partially converted into benzaldehyde by spontaneous chemical equilibrium under microwave irradiation. Conventional transesterification of (±)-mandelonitrile in an orbital shaker produced the unreacted (R)-mandelonitrile (51% ee) and the (S)-mandelonitrile acetate (98% ee)

This work presents the experiments taken to the adoption of the ABNT NBR 15556 norm, a Brazilian norm for the determination of Na, K, Ca and Mg in biodiesel