Marcus model-based analysis of the photo-quenching mechanism of a boronic acid fluorophore: water concentration dependence of electron transfer rate.

The photo-quenching mechanism of 2-(4-phenylboronic acid)-1-pyrenemethamide (C1-APB), which has potential application as a saccharide-recognition sensor, was investigated. By performing temperature-dependent time-resolved photoluminescence measurements, we determined the mechanism responsible for the photo-quenching properties of C1-APB to be a photoinduced electron transfer (PET). Moreover, the dependence of the electron transfer rate (k) on the solvent water concentration was explored in detail, and it was found that k increased by many orders of magnitude with increasing water concentrations.

[ECG changes during emergence from anesthesia in a patient with LEOPARD syndrome].

LEOPARD syndrome is a rare congenital disease characterized by seven features. Besides the original clinical manifestations, hypertrophic cardiomyopathy was reported as an additional laboratory finding recently. We gave general anesthesia to a child of this syndrome, and encountered ECG changes during emergence from anesthesia.