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Michino Tomohiro,Tanabe Kumiko,Takenaka Motoyasu,Akamatsu Shigeru,Uchida Masayoshi,Iida Mami,Iida Hiroki 대한마취통증의학회 2021 Korean Journal of Anesthesiology Vol.74 No.6
Background: Cerebral blood flow (CBF) has direct effects on neuronal function and neurocognitive disorders. Oxidative stress from abdominal aortic surgery is important in the pathophysiology of CBF impairment. We investigated the effect of edaravone on the pial arteriolar diameter changes induced by abdominal aortic surgery and the involvement of the endothelium in the changes.Methods: The closed cranial window technique was used in rabbits to measure changes in pial arteriolar diameter after the unclamping of abdominal aortic cross-clamping with an intravenous free radical scavenger, edaravone (control group [n = 6], edaravone 10 μg/kg/min [n = 6], 100 μg/kg/min [n = 6]). Pial vasodilatory responses to topical application of acetylcholine (ACh) into the cranial window were investigated before abdominal aortic cross-clamping and after unclamping with intravenous administration of edaravone (control group [n = 6], edaravone 100 μg/kg/min [n = 6]).Results: Aortic unclamping-induced vasoconstriction was significantly attenuated by continuous infusion of edaravone at 100 μg/kg/min. Topical ACh after unclamping did not produce any changes in pial arteriolar responses in comparison to before aortic cross-clamping in the control or edaravone groups. The changes in the response to topical ACh after unclamping in the saline and edaravone groups did not differ significantly.Conclusions: Free radicals during abdominal aortic surgery might have contracted cerebral blood vessels independently of endothelial function in rabbits. Suppression of free radicals attenuated the sustained pial arteriolar vasoconstriction after aortic unclamping. Thus, the free radical scavenger might have some brain protective effect that maintains CBF independently of endothelial function.
Degradation of Fuel Cell Characteristic in PEFC by Hydrogen Peroxide
Namsun Choi,Ayami Kameda,Shinji Kato,Tomohiro Tanabe,Kazuhiko Noda,Hachiro Imai 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
The hydrogen peroxide made by the reaction in a fuel cell may degrade the conductivity in polymer electrolyte fuel cells (PEFC) . The degradation behavior of solid polymer electrolyte membrane in PEFC is investigated by using membrane that was immersed into hydrogen peroxide solutions as sample for each measurement. The measurement of the proton diffusion rate in the membrane was performed for the proton conductivity measurement. The current-cell voltage curve measurement was performed for the investigation of a fuel cell performance. The measurement of proton diffusion rate of a solid polymer electrolyte membrane can be applied to evaluate conductivity in a fuel cell.