Hydrothermal-mediated in-situ nitrogen doping to prepare biochar for enhancing oxygen reduction reactions in microbial fuel cells.

Nitrogen-doped carbon materials are deemed promising cathode catalysts for microbial fuel cells (MFCs). The challenge lies in reducing costs and enhancing the proportion of electrocatalytically active nitrogenous functional groups. This study proposes a hydrothermal-mediated in-situ doping method to produce nitrogen-doped biochar from aquatic plants.

Microstructure Evolution during Dissimilar Friction Stir Welding of AA7003-T4 and AA6060-T4.

In this work, the dissimilar joint of AA7003-T4 and 6060-T4 alloy has been produced by friction stir welding (FSW). The microstructure was examined by optical microscope (OM), electron back scattered diffraction (EBSD), transmission electron microscopy (TEM), and the mechanical properties of the joint were investigated. It is demonstrated that sound dissimilar joint can be produced through FSW.

[Expression of follistatin, activin A and BMP-4 in rats with hypoxic-ischemic brain damage].

Objective: To investigate the expression and significance of follistatin, activin A and bone morphogenetic protein-4 (BMP-4) in normal brain tissues of rats and the brain tissues with hypoxic and ischemicgin.

Methods: Sixty conception SD rats were divided into normal and model group (with 30 for each). According to the development of fetal rats in each group, they were randomly divided into six subgroups (embryonic stage 8.