Tatsuhiko Yajima

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It was observed in our laboratory that methoxyacetaldehyde induced strong fluorescence with L-tryptophan in the presence of NaNO2 at pH 2.75. The reaction mixture was heated at 80 degrees C for 15 min and the fluorescence was measured at the excitation wavelength, 253 nm and the emission, 450 nm. Amino acids other than L-tryptophan did not produce(More)
Recent reports suggest that skin barrier function and atopic dermatitis are related to skin surface pH. We are developing a portable multifunctional skin measurement system for evaluating data such as skin pH and water content. The system uses a non-invasive method for measuring the skin’s surface pH and does not require addition of water. Previously, we(More)
Multivalent cation rechargeable batteries are expected to perform well as high-capacity storage devices. Rechargeable magnesium batteries have an advantage in terms of resource utilization and safety. Here, we report on sulfur-doped vanadium pentoxide (S-V₂O₅) as a potential material for the cathodes of such a battery; S-V₂O₅ showed a specific capacity of(More)
We have developed a highly sensitive and simple precolumn derivatization method for simultaneous determination of 5-hydroxyindoles (5HIs) and catecholamines (CAs) with 4-dimethylaminobenzylamine (DMBA). The method was successfully applied to the determination of 5HIs and CAs in plasma and urine.
We used dibasic acid esters as the absorbent for a volatile organic compounds (VOC) recovery and reuse system geared mainly toward VOCs from painting and presswork. The system consists of three elements: absorption using dibasic acid esters, separation by vacuum spray flash method, and recovery by condensation. The concentration of both ethyl acetate (EtAc)(More)
The decomposition of a poly(amide-imide) thin film coated on a solid copper wire was attempted using atmospheric pressure non-equilibrium plasma. The plasma was produced by applying microwave power to an electrically conductive material in a gas mixture of argon, oxygen, and hydrogen. The poly(amide-imide) thin film was easily decomposed by argon-oxygen(More)
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