Ochnaceae s.s., Quiinaceae e Medusagynaceae são filogeneticamente relacionadas e por vezes consideradas como Ochnaceae s.l., sendo apenas as duas primeiras conhecidas para o Brasil. Ochnaceae s.s. ocorre nas regiões tropicais e subtropicais, enquanto Quiinaceae é exclusivamente neotropical e predominantemente amazônica. No nordeste do Brasil, estão registrados os gêneros Elvasia DC., Luxemburgia A.St.-Hil., Ouratea Aubl., Sauvagesia L. (Ochnaceae s.s.) e Lacunaria Ducke e Quiina Aubl. (Quinaceae). Na Usina São José (USJ), Ochnaceae está representada por Ouratea castaneifolia (DC.) Engl., O. crassa Tiegh., O. hexasperma (A.St.-Hil.) Baill. e Sauvagesia erecta L., e Quiinaceae por Q. florida Tul. O trabalho inclui chave de identificação, descrições, comentários gerais sobre distribuição geográfica e habitats, caracteres diagnósticos e ilustrações.

Ochnaceae s.s., Quiinaceae and Medusagynaceae are phylogenetically related and sometimes treated as Ochnaceae s.l., but only the first ones are recorded to Brazil. Ochnaceae s.s. occurs in tropical and subtropical while Quiinaceae is exclusively neotropical and predominantly distributed in the Amazon forest. In northeastern Brazil, the recognized genera are Elvasia DC., Luxemburgia A.St.-Hil., Ouratea Aubl., and Sauvagesia L. (Ochnaceae s.s.), and Lacunaria Ducke and Quiina Aubl.(Quinaceae). In the Usina São José is represented by Ouratea castaneifolia (DC.) Engl., O. crassa Tiegh., O. hexasperma (A.St.-Hil.) Baill., and Sauvagesia erecta L. (Ochnaceae s.s.), and Quiina florida Tul. (Quiinaceae). This study includes identification key, descriptions, general comments about the species and habitats, and illustrations.

The post-preparative size-selective precipitation technique was applied in CdTe and CdSe semiconductor nanocrystals prepared via colloidal route in water. The synthesis of CdTe and CdSe nanoparticles and the effect of the post-preparative size-selective precipitation have been characterized mainly by mean of ultraviolet and visible absorption spectroscopy (UV-Vis). It was demonstrated that the size-selective precipitation are able to isolate particles of different sizes and purify the nanoparticles as well.

Colloidal semiconductor nanocrystals, also known as quantum dots, have attracted great attention since they have interesting size-dependent properties due to the quantum confinement effect. These nanoparticles are highly luminescent and have potential applications in different technological areas, including biological labeling, light-emitting diodes and photovoltaic devices. The synthetic methods of semiconductor nanocrystals have progressed in the last 30 years, and several protocols were developed to synthesize monodisperse nanocrystals with good optical properties, different compositions and morphologies. This review describes the main methods used to synthesize nanocrystals in the II-VI and III-V systems, and the recent approaches in this field of research.