Publications by authors named "Byoung-Min Choi"
Complete oxidation of ethylene over supported gold nanoparticle catalysts.
J Nanosci Nanotechnol
November 2006
Article Synopsis
- Complete oxidation of ethylene was studied using various noble metal and transition metal oxide catalysts, particularly gold nanoparticles on Al2O3 and MxOy, under atmospheric pressure.
- Gold nanoparticles prepared via different methods (impregnation, coprecipitation, deposition) varied in size, with deposition yielding the most uniform and smallest particles at 4-5 nm, leading to higher catalytic activity.
- The activity ranking of the catalysts based on preparation methods was deposition > coprecipitation > impregnation, with Au/Co3O4 showing the highest performance, largely due to gold's role in enhancing oxygen adsorption and catalyst reoxidation.
Nitric oxide (NO), produced from L-arginine and molecular oxygen in a reaction catalyzed by one of three NO synthase isoenzymes, can prevent or induce neuronal apoptosis depending on its concentration and cellular redox state. This molecule affords neuroprotection by post-translational S-nitrosylation of NMDA receptor, caspases and p21ras, and increases the expression of cytoprotective genes such as HSP70, heme oxygenase and Bcl-2. Moreover, the NO/cGMP pathway activates the anti-apoptotic serine/threonine kinase Akt by protein kinase G-dependent activation of phosphatidylinositol 3-kinase.
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