Helena Antipoff: razão e sensibilidade na psicologia e na educação

ESTE ESTUDO trata da biografia intelectual da psicóloga e educadora Helena Antipoff (1892-1974), enfatizando os diferentes momentos de sua trajetória e a formação progressiva de seu pensamento, com base na perspectiva interacionista da psicologia genebrina e na corrente socioistórica da psicologia soviética. Este pensamento, elaborado no processo de adaptação a culturas diversas em épocas de grandes transformações socioculturais, na Rússia, França, Suíça e Brasil, caracteriza-se pela informação científica avançada e progressista, aliada a um grande sentido prático, e ao compromisso com a convivência democrática.<br>THIS IS A STUDY of the intellectual biography of the psychologist and educator Helena Antipoff (1892-1974), presenting the successive moments of her life and work and the progressive elaboration of her thought, drawing on Genevan interactionism and Soviet social and historical psychology. Her ideas, shaped in the process of adaptation to different cultures in times of great sociocultural transformations, in Russia, France, Switzerland and Brazil, is characterized by advanced and progressivist scientific information, associated to a pragmatic sense and a compromise with democratic conviviality

Versatile magnetic carbon nanotubes for sampling and pre concentration of pesticides in environmental water

International audienceThis article describes a simple, efficient, and versatile magnetic carbon nanotubes (MCNT) method for sampling and pre-concentration of pesticides in environmental water samples. The multi-walled magnetic carbon nanotubes were obtained by chemical deposition vapor (CVD) process. The MCNTs structures are formed of hydrophobic and hydrophilic fractions that provide great dispersion at any water matrix allowing simultaneously a high efficiency of pesticides sorption. Following the extraction, analytes were desorbed with minor amounts of solvent and analyzed by gas chromatography coupled mass spectrometry (GC/MS). The parameters amount of MCNTs used to extraction, desorption time, and desorption temperature were optimized. The method showed good linearity with determination coefficients between 0.9040 and 0.9733. The limits of detection and quantification were ranged between 0.51 and 2.29 µg L−1 and between 1.19 and 5.35 µg L−1 respectively. The recovery ranged from 79.9% to 111.6%. The method was applied to the determination of fifteen multiclass pesticides in real samples of environmental water collected in Minas Gerais, Brazil