Cabinet des modes, ou les Modes nouvelles, décrites d'une manière claire & précise, & représentées par des planches en taille-douce, enluminées

1786/04/15 (N11).

Cabinet des modes, ou les Modes nouvelles, décrites d'une manière claire & précise, & représentées par des planches en taille-douce, enluminées

1786/03/01 (N8).

Cabinet des modes, ou les Modes nouvelles, décrites d'une manière claire & précise, & représentées par des planches en taille-douce, enluminées

1786/10/01 (N22).

Cabinet des modes, ou les Modes nouvelles, décrites d'une manière claire & précise, & représentées par des planches en taille-douce, enluminées

1786/10/15 (N23).

Cabinet des modes, ou les Modes nouvelles, décrites d'une manière claire & précise, & représentées par des planches en taille-douce, enluminées

1786/03/15 (N9).

Cabinet des modes, ou les Modes nouvelles, décrites d'une manière claire & précise, & représentées par des planches en taille-douce, enluminées

1786/02/01 (N6).

Cabinet des modes, ou les Modes nouvelles, décrites d'une manière claire & précise, & représentées par des planches en taille-douce, enluminées

1786/09/01 (N20).

Cabinet des modes, ou les Modes nouvelles, décrites d'une manière claire & précise, & représentées par des planches en taille-douce, enluminées

1786/09/15 (N21).

Cabinet des modes, ou les Modes nouvelles, décrites d'une manière claire & précise, & représentées par des planches en taille-douce, enluminées

1786/07/15 (N17).

Monomer conversion of composite dental resins photoactivated by a halogen lamp and a LED: a FT-Raman spectroscopy study

Eighteen circular blocks of resins cured either by a LED or a halogen lamp (20, 40 and 60 s), had their top (T) and bottom (B) surfaces studied using a FT-Raman spectrometer. Systematic changes in the intensity of the methacrylate C=C stretching mode at 1638 cm-1 as a function of exposure duration were observed. The calculated degree of conversion (DC) ranged from 45.0% (B) to 52.0% (T) and from 49.0% (B) to 55.0% (T) for the LED and halogen lamp, respectively. LED and halogen light produced similar DC values with 40 and 60 s of irradiation.

Estresse oxidativo: relação entre geração de espécies reativas e defesa do organismo

This work describes the mechanism of action of some reactive oxygen species (ROS) and reactive nitrogen species (RNS) in the oxidative stress of the human body, and their consequences on damage to DNA, RNA, proteins and lipids. It also illustrates the defense system of our organism against these ROS and RNS species. The action of nonenzymatic protection systems is reported, with emphasis on micromolecules like Q10 coenzyme, vitamin C, alpha-tocopherol, carotenoids and flavonoids. The importance of flavonoids is also emphasized, and their body protection mechanism is detailed.

Antimycobacterial and cytotoxicity activity of synthetic and natural compounds

Antimycobacterial and cytotoxicity activity of synthetic and natural compounds. Secondary metabolites from Curvularia eragrostidis and Drechslera dematioidea, Clusia sp. floral resin, alkaloids from Pilocarpus alatus, salicylideneanilines, piperidine amides, the amine 1-cinnamylpiperazine and chiral pyridinium salts were assayed on Mycobacterium tuberculosis H37Rv. N-(salicylidene)-2-hydroxyaniline was the most effective compound with a minimal inhibitory concentration (MIC) of 8 µmol/L. Dihydrocurvularin was moderately effective with a MIC of 40 µmol/L. Clusia sp. floral resin and a gallocatechin-epigallocatechin mixture showed MIC of 0.02 g/L and 38 µmol/L, respectively. The cytotoxicity was evaluated for N-(salicylidene)-2-hydroxyaniline, curvularin, dihydrocurvularin and Clusia sp. floral resin, and the selectivity indexes were > 125, 0.47, 0.75 and 5, respectively.

Fatores químicos e físicos que afetam a contaminação por chumbo e cobre em água potável: uma abordagem para o estudo de caso em química analítica

Lead and copper concentrations in drinking water increase considerably on going from municipality reservoirs to the households sampled in Ribeirão Preto (SP-Brazil). Flushing of only 3 liters of water reduced metal concentrations by more than 50%. Relatively small changes in water pH rapidly affected corrosion processes in lead pipes, while water hardness appeared to have a long-term effect. This approach aims to encourage University teachers to use its content as a case study in disciplines of Instrumental Analytical Chemistry and consequently increase knowledge about drinking water contamination in locations where no public monitoring of trace metals is in place.

A validated HPLC analytical method for the analysis of solasonine and solamargine in in vitro skin penetration studies

To assess topical delivery studies of glycoalkaloids, an analytical method by HPLC-UV was developed and validated for the determination of solasonine (SN) and solamargine (SM) in different skin layers, as well as in a topical formulation. The method was linear within the ranges 0.86 to 990.00 µg/mL for SN and 1.74 to 1000.00 µg/mL for SM (r = 0.9996). Moreover, the recoveries for both glycoalkaloids were higher than 88.94 and 93.23% from skin samples and topical formulation, respectively. The method developed is reliable and suitable for topical delivery skin studies and for determining the content of SN and SM in topical formulations.