K extraction induced phase evolution of KFeO.

Orthorhombic KFeO has a unique structure where K cations can migrate inside the Fe-O skeleton, thus making it a promising material for heterogeneous catalysis and electrochemical energy storage devices. However, KFeO is sensitive to conditions such as moisture and carbon dioxide, which would trigger severe phase evolution and consequently deteriorate the performance. In this work, we investigated the phase evolution using freshly prepared KFeO and KFeO after exposure to ambient air and after immersion in water, respectively.

Preparation of Crystalline LaFeO Nanoparticles at Low Calcination Temperature: Precursor and Synthesis Parameter Effects.

Substantial effort has been devoted to fabricating nanocrystalline lanthanum ferrite (LaFeO), and calcination is the crucial process of crystallization in both high-temperature strategies and wet chemical methods. Lowering the calcination temperature gives the ability to resist the growth and agglomeration of nanoparticles, therefore contributing to preserve their unique nanostructures and properties. In this work, we prepared crystalline LaFeO nanoparticles with a calcination process at 500 °C, lower than the calcination temperature required in most wet chemistry methods.

The memory enhancement effect of Kai Xin San on cognitive deficit induced by simulated weightlessness in rats.

Ethnopharmacological Relevance: It is vital for astronauts to develop effective countermeasures to prevent their decline of cognitive performance in microgravity to make space-flight missions successful. The traditional Chinese herbal formula Kai Xin San (KXS) has been used to treat amnesia for thousands years. It is a traditional complex prescription comprising of ginseng (Panax ginseng C.

[Study on anti-proliferation activity and the mechanisms of alkaloid monomers from Gelsemium elegans on HepG2 cell in vitro].

Objective: To investigate the effects of alkaloid monomers from Gelsemium elegans on proliferation of HepG2 cell in vitro and the possible mechanism.

Methods: MTT assay was used to measure the inhibitory of three alkaloid monomers on HepG2 cell in vitro. The most effective fraction was chosen to test whether the effect was in time-and dose-dependent manner.