Topochemical synthesis and photocatalytic activity of 3D hierarchical BaTiO microspheres constructed from crystal-axis-oriented nanosheets.

Novel BaTiO hierarchical porous microspheres were achieved by using HTiO·HO (HTO) hierarchical microspheres as a precursor template via a facile solvothermal method. Interestingly, the BaTiO microspheres were constructed with two-dimensional (2D) nanosheets, which were composed of many order nanocrystals with crystal-axis-orientation. The special hierarchical structure, which is both macroporous and mesoporous, exhibits a large specific surface area and a high total pore volume.

[Study on activation of benzo(a)pyrene and DNA damage mediated by lipoxygenase in human bronchial epithelial cells].

Objective: The oxidation of benzo (a) pyrene mediated by 5-lipoxygenase (5-LOX) were investigated in HBE cells in order to provide further proof that lipoxygenase is the alternative pathway for the oxidation of xenobiotics.

Methods: Enzymic experiment: Soybean lipoxygenase (SLO), substrate (benzo[a] pyrene) and other component react in the enzymic system and the reaction product are detected by spectrophotometry. At the same time, in vitro detect of benzo (a) pyrene-DNA adducts with a UV spectrophotometer and HPLC.