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Yamamoto Y.,Tohoku University | Chikawa J.,Hyogo Science and Technology Association | Uegaki Y.,Yamanashi Prefectural Fuji Industrial Technology Center | Usuda N.,Aichi University | And 2 more authors.
Cancer Science | Year: 2010

Exposure to internally deposited radionuclides is known to induce malignant tumors of various histological types. Thorotrast, a colloidal suspension of radioactive Thorium dioxide (232ThO2) that emits alpha-particles, was used as a radiographic contrast during World War II. Thorotrast is known to induce liver tumors, particularly intrahepatic cholangiocarcinoma (ICC) and angiosarcoma (AS), decades after injection. Therefore, patients injected with Thorotrast comprise a suitable study group to understand biological effects of internal ionizing radiation injury. Autoradiography and X-ray fluorescence spectrometry (XRF) were carried out on non-tumorous liver sections from Thorotrast-induced ICC (T-ICC) and Thorotrast-induced AS (T-AS). Autoradiography revealed that the slope of the regression line of the number of alpha tracks for the amount of deposited Thorium (232Th) was higher in non-tumorous parts of the liver with T-ICC than those with T-AS. XRF showed that the intensity ratio of Radium (Ra) to Thorium (Th) in non-tumorous liver tissue with T-ICC was significantly higher than that with T-AS. Furthermore, the mean 228Ra/232Th radioactivity ratio at the time of death calculated was also significantly higher in T-ICC cases than in T-AS cases. These suggest that the metabolic behavior of radionuclides such as relocation and excretion, as well as the content of deposited radionuclides, is a major factor in determining the histological type of Thorotrast-induced liver tumors. © 2009 Japanese Cancer Association.

Uegaki Y.,Yamanashi Prefectural Fuji Industrial Technology Center | Sato T.,Yamanashi University
Journal of the Japan Research Association for Textile End-Uses | Year: 2015

The technique to dye fibers green by using plant dyes, traditionally pre-mordanted by iron acetate, should be considered from the viewpoint of deepness and light-fastness of the hue. We have therefore investigated the use of vanadium as an alternative mordanting material, as it represents a transition element that is in the same period as iron. Wool fibers were dyed using tetravalent vanadium solutions, with solutions of 5 ×10-3 mol/L vanadyl sulfate found to produce a deep green color and light fastness with a natural plant dye yashabushi 50 % owf. Electron spin resonance spectrum of vanadium on the wool was identified as signal associated with complex of oxovanadium remained in wool. It was shown that the wool dyed green by vanadium has low irritation to skin and the vanadium is effective as the new mordant which could reduce environmental load. ©2015 Jpn.Res.Assn.Text.End-Uses.

Kijima K.,Yamanashi Prefectural Industrial Technology Center | Kijima K.,Yamanashi University | Abe O.,Yamanashi Prefectural Fuji Industrial Technology Center | Shimizu A.,Yamanashi Prefectural Industrial Technology Center | And 5 more authors.
Optical Review | Year: 2015

A novel electro-optical radio frequency field sensor with simple structure and high sensitivity is realized using single total internal reflection in electro-optical crystals. Without employing any waveguide structures, the minimum detectable electric field strength of the total internal reflection electro-optical-sensor is estimated to 86.52 dB μV/m (21.18 mV/m) at a resolution band width of 100 Hz for a short interaction length. © 2015, The Optical Society of Japan.

Uegaki Y.,Yamanashi Prefectural Fuji Industrial Technology Center | Watanabe M.,Yamanashi Prefectural Fuji Industrial Technology Center | Sato T.,Yamanashi University | Koizumi M.,Japan Institute for Environmental Sciences | Hasegawa T.,Japan Institute for Environmental Sciences
Journal of the Japan Research Association for Textile End-Uses | Year: 2014

We have discussed in detail the optimum pre-mordanting conditions of vanadium in the dyeing of wool with sumac gallnut as a natural plant dye. The optimum conditions of pre-mordanting were 5 mM of vanadium at 100 °C and 50 % owf of sumac gallnut. After mordanting, vanadium was distributed over the wool epidermis. The resultant vanadium black complex plays an important role in developing the colored products, with sumac gallnut having a low affinity for wool. To develop the dyeing method with excellent utility, we compared the toxicities of vanadyl sulfate with those of copper sulfate to Oryzias latipes. We showed that vanadyl sulfate is less toxic than copper sulfate. Moreover, experimental calculations of vanadium concentration showed that the low concentration of vanadium used in the present study has toxicity similar to that found in nature. © 2014 Jpn. Res. Assn. Text. End-Uses.

Uegaki Y.,Yamanashi Prefectural Fuji Industrial Technology Center | Watanabe M.,Yamanashi Prefectural Fuji Industrial Technology Center | Utada M.,Yamanashi Prefectural Fuji Industrial Technology Center | Sato T.,Yamanashi University | And 2 more authors.
Sen'i Gakkaishi | Year: 2013

Mordant technology is often required for dyeing by natural dyes. The major problem with natural dyes is deepness of black color. So we analyzed the characteristic chromaticness with four kinds of natural dyes and three metals to improve it. We focused on vanadium, which is a transition element in a same period with iron or copper. Effective methods were found for the improvements of the dyeings with tetravalcnt vanadium compounds, vanadyl sulfate and tannin. Especially, tannic acid and gallic acid were hypochromically and fastly dyed on wool for the first time in the history of dyeing.

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