Resumo: Este trabalho investiga quantitativamente a trajetória da blogosfera científica brasileira através de dados estatísticos. A amostra é constituída por 346 blogs científicos do banco de dados Anel de Blogs Científicos, que compreende grande parte dos blogs científicos no Brasil, verificando a atividade destes entre as datas da primeira postagem e a postagem mais recente até novembro de 2015. São analisados dados sobre gêneros de blogueiros, temática científica, distribuição regional e tempo de atividade dos blogs, e curva de crescimento dos blogs ativos. Os resultados mostram que em 37% dos blogs participam mulheres e em 74% dos blogs participam homens; a temática predominante é a de Ciências da Vida; a maioria dos blogs se concentra nas regiões Sul e Sudeste do país; e a vida média sobre todos os blogs é de 4,8 anos, com um coeficiente de variação de 0,58. Um achado importante é que o número de blogs ativos parece ter diminuído nos últimos anos. Conjecturamos que esse fenômeno é devido à concorrência com
CNFD (6b,7-dihydro-5H-cyclopenta[b]naphtho[2,1-d]furan-5,6(9aH)-dione) is a semisynthetic naphthoquinone derived from lawsone that has cytotoxic action in different tumor lines and anticancer activity in vivo. Therefore, this molecule is a relevant candidate for drug development, but there is still no information on its human metabolism and systemic elimination. This study aimed to investigate the in vitro metabolism of this naphthoquinone by human liver microsomes. Initially, in order to determine the in vitro enzymatic kinetic parameters, a high performance liquid chromatography (HPLC) method to quantify the CNFD was developed and validated. In addition, the enzymatic kinetic data, the predicted pharmacokinetic in vivo parameters and the phenotyping study were presented. The main metabolism sites and metabolites have been suggested in silico. The developed HPLC method was linear, reproducible, selective, accurate, and stable. The enzymatic kinetic parameters revealed a sigmoidal profile. In vitro to in vivo extrapolation hepatic metabolic clearance was 10.39 mL min-1 kg-1 protein and the liver extraction rate was 51%. The clearance in vivo associated with a hepatic extraction ratio indicates that the hepatic metabolism is the main route of elimination. Although all cytochrome P450 enzymes evaluated metabolized CNFD, CYP2C9 and CYP3A4 showed higher metabolic capacity. For the first time, metabolism studies of CNFD were demonstrated.
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