岡山大学文学部Acta Medica Okayama0285-4864742021建保三年『内裏名所百首』小考122144ENHirokiTanaka10.18926/okadai-bun-kiyou/63070No potential conflict of interest relevant to this article was reported.岡山大学文学部国語国文学研究室Acta Medica Okayama0386-3123241996藤原俊成の藤原基俊への入門をめぐって―伊通と雅定―120EN10.18926/okadaironkou/60254No potential conflict of interest relevant to this article was reported.岡山大学文学部日本語日本文学研究室Acta Medica Okayama0386-3123302002西園寺公経の和歌と王朝物語――正治・建仁期を中心に――7081EN10.18926/okadaironkou/60168No potential conflict of interest relevant to this article was reported.岡山大学文学部言語国語国文学会Acta Medica Okayama0386-3123342006三宮惟明親王の正治初度百首詠について2538EN10.18926/okadaironkou/60093No potential conflict of interest relevant to this article was reported.岡山大学文学部Acta Medica Okayama0285-4864622014『三百六十番歌合』再考122101ENHirokiTanaka10.18926/okadai-bun-kiyou/53089No potential conflict of interest relevant to this article was reported.岡山大学文学部Acta Medica Okayama0285-4864582012藤原定家の「藤河百首」について144117ENHirokiTanaka10.18926/okadai-bun-kiyou/49075No potential conflict of interest relevant to this article was reported.日本分析化学会Acta Medica Okayama0910-63401311997Ion Association Reaction between Divalent Anionic Azo Dyes and Hydrophobic Quaternary Ammonium Ions in Aqueous Solution as Studied by Capillary Zone Electrophoresis1118ENToshioTakayanagiShojiMotomizuIon association properties of four kinds of anionic divalent azo dyes were investigated in an aqueous solution containing hydrophobic quaternary ammonium ions. The dyes used in this study possessed a hydroxy and a sulfonate group, which existed as a divalent anion in an alkaline solution. In capillary electrophoresis measurements, the apparent electrophoretic mobility of the dyes decreased along with an increase in the concentration of quaternary ammonium ion (Q(+)) in a migrating solution. Ion association constants of the dyes with Q(+), K(ass), were determined by a simulation method of the mobility change using a non-linear least square method, when 1:1 ion associates formed. The increase in log K(ass) was about 0.07 log unit per one methylene group; that is, the hydrophobicity of a pairing ion played an important role in the ion association reaction in aqueous solutions, as well as ion association in solvent extraction systems. Nitro groups of the dyes slightly affected the ion association constants, whereas the position of the sulfonate group in the azo dyes showed a significant change in ion association constants.No potential conflict of interest relevant to this article was reported.日本分析化学会Acta Medica Okayama0910-634017112001Highly Sensitive Determination Method for Total Carbonate in Water Samples by Flow Injection Analysis Coupled with Gas-Diffusion Separation12851290ENMitsukoOshimaYanlinWeiMasakiYamamotoHirokiTanakaToshioTakayanagiShojiMotomizuA spectrophotometric method for the determination of total carbonate in water samples was developed. The method is based on the color change of an acid-base indicator in relation to the concentration of permeable gas substances through a membrane. By using a new portable FIA system equipped with a gas-diffusion unit, a highly sensitive and on-site determination of total carbonate in aqueous solutions was investigated. A new color-change system with 4-(2',4'-dinitrophenylazo)-1-naphthol-5-sulfonic acid (DNN5S) was developed. Absorbance changes of the reagent solution were measured at 450 nm with a light-emitting diode (LED) as a light source. A new type of gas-diffusion unit was used, and was constructed with double tubing: the inner tubing was a micro porous PTFE (polytetrafluoroethylene) tubing (1.0 mm inner diameter and 1.8 mm outer diameter, pore size 2 μm, porosity 50%); the outer tubing was made of glass with 2.0 mm inner diameter. The optimized system conditions were as follows: the sample size was 200 μl, the temperature of the air bath for the gas-diffusion unit was 25℃, and the length of the gas-diffusion unit was 15 cm; each flow rate was 0.3 ml min(-1). For measuring carbonate at low concentrations, a method for preparing water with less carbonate was proposed: the carbonate content of the water was decreased down to 5×10(-7) M. The calibration graph was rectilinear from 1×10(-6) M to 10(-3) M, and the detection limit (corresponding to a signal-to-noise ratio of 3) was 1×10(-6) M of carbonate. The relative standard deviation (RSD) of ten measurements of 2.3×10(-5) M Na(2)CO(3) solution was 1.9%. The total carbonate in various kinds of water (such as river, sea, rain, distilled and ultra purified) was determined.No potential conflict of interest relevant to this article was reported.岡山大学文学部Acta Medica Okayama200612006藤原定家の十体論について ―その概略と定家の幽玄観について―1127ENHirokiTanakaNo potential conflict of interest relevant to this article was reported.