著者

Yamamoto Ikuo Iio Katsunori Nagata Kazukiyo

出版者

一般社団法人日本物理学会

雑誌

Journal of the Physical Society of Japan (ISSN:00319015)

巻号頁・発行日

vol.49, no.5, pp.1756-1759, 1980-11-15

被引用文献数

6

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Magnetic anisotropies of several mangane secryst,als have been naeasured accu-rately between 77 K and 300 K by using a high sensitive torque-naeter. ,As ispredicted by the high temperature expansion th<cory, the observed naagneticanisotropies vary as the inverse square of the tempe.rature. The crystal field split-ting parameters D and E have been obtained for<>ach pure magnetically densesanuple. In compounds having the octahedron witla two water molecules alongthe axial direction, the splitting parameters D have been found to be about -0.1cm-', which value is two tiznes or one order of mag;nitude larger than the typicalvalue of Mn" surrounded by a distorted octaheclron composed of six si.milarligands. Especially, the value 17)l =0.368 cm ' fo'ar [(CH.).NlI]MnBr.2I-[.0 isthe largest one reported to date.

著者

DEMURA REIKO TSUKADA SHIRO SHIGA KIMIKO YAMAMOTO IKUO

出版者

公益社団法人日本薬学会

雑誌

衛生化学 (ISSN:0013273X)

巻号頁・発行日

vol.32, no.3, pp.219-225, 1986-06-30

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A fluorometric determination of H_2O_2 based on the formation of amprochrome was developed. Amprochrome is an oxidation product of amprolium, an agent used for treating coccidiosis of chickens, and has a strong fluorescence. Though potassium ferricyanide has been used for oxidizing amprolium, H_2O_2 is also considered to be useful for the reaction. The analytical procedure was as follows. To a sample solution containing a suitable quantity of H_2O_2,1 ml of amprolium (500 μg/ml), NaOH (10%) and peroxidase solution (20 units/ml) were added. The mixture was shaken for 45 min at room temperature and amprochrome produced was extracted with 10 ml of isoBuOH after saturating the solution with sodium sulfate. Relative fluorescence intensity of the separated isoBuOH layer was measured (excitation wavelength 400 nm and emission wavelength 460 nm) against that of 10^<-6>M quinine sulfate in 0.1 N H_2SO_4. The calibration plot was linear up to H_2O_2 0.2 μg/tube. On the basis of the proposed method, remaining H_2O_2 in Japanese noodles (udon) could be determined with a recovery of 82.4-108%.