Intratumoral temperature and morphological change were studied in rat brain tumor model to assess the cause of anti-tumor effect by BPD photoradiation therapy.
At lower power density of the laser it was strongly suggested that tumor destruction was attributed to a photochemical reaction alone, but at high power density it was attributed to the effects of conbined photochemical reaction and hyperthermia.

抄録全体を表示

Stripping voltammetry is one of the most sensitive methods to determine metal ions in natural waters. Usually mercury electrodes are employed as working electrodes. If electrodes as good as mercury electrodes are available, it is desirable to use them owing to the toxicity of mercury. Glassy carbon is considered to be a suitable alternative. In this report anodic stripping voltammetry of lead at a glassy carbon electrode without any mercury coating was investigated. The effect of potential scan rate on stripping voltammograms was investigated from 5 to 9000 mV/s. It was found that 1000 mV/s gave the best results. The most suitable supporting electrolyte was 0.1 M HCl. The most suitable preconcentration time and preconcentration potential were 10 min and -0.8 V vs. SCE, respectively. The calibration curve was linear up to 0.1 mM lead. The detection limits were 20 nM (10 min preconcentration) and 8 nM (30 min preconcentration). The relative standard deviation was 5.87% at 50 nM Pb. Lead in a river water sample was determined to be 14 nM using the preconcentration by ion exchange resin.

抄録全体を表示

混合電解質塩橋液を用いたガラス・比較電極セル中でのpH測定から,規約液間電位差を検討し,JISに基づくpH測定用の推奨塩橋組成を提案した。使用した塩橋液は,ほぼ0.5の輸率をもつ第1成分(KCl,CsClまたはKNO3)と輸率調整用の第2成分(酢酸塩またはハロ酢酸塩)よりなる。二つのpH標準液(フタル酸塩および中性リン酸塩)を用いて決定した電極の見かけの応答勾配は,第2電解質の添加とともに増加した。二つのpH標準液中での規約液間電位差の差(ΔE5J(convent.))は,一定イオン強度下で,第2電解質のモル分率(x2)の関数で表される;ΔE5J(c◎nvent.)=A-Bx2/(x2+C)。ここで,Aは第1電解質の性質に,Bは第1,第2電解質の組み合わせに,Cは主として第2電解質の性質に依存する定数である。上式は,Henderson式と混合電解質の輸率から半定量的に導出される。3.903mol・dm-3KCl-0.097mol・dm-3CH3CO2K,2.41mol・dm-3KNO3-0.59mol・dm-3KC1および1.13mol・dm-3KNO3-1.87mol・dm-3KClの塩橋液は,三つのpH標準液(それぞれ,シュウ酸塩・フタル酸塩・中性リン酸塩,フタル酸塩・中盤リン酸塩・ホウ酸塩および中性リン酸塩・ホウ酸塩・炭酸塩)のpH領域における測定に推奨される(それらの応答勾配はNernst値より低いが,これら3標準液についてa実験誤差範囲内で直線検量線が得られる)

抄録全体を表示