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土成, 昭弘 ; 保木井, 利之 ; 下林, 修 ; 金岡, 千嘉男
概要:
In a permeable MgO ceramic containing TiO_2 and Al_2O_3 as matrix MgO ・ Al_2O_3-2MgO・TiO_2 solid solutions were detected
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and no Al_2O_3・TiO_2 was observed. Therefore, the solid state reaction among MgO, TiO_2 and Al_2O_3 with excess MgO was studied at various firing temperatures. The formation mechanism of MgO・Al_2O_3-2MgO・TiO_2 solid solutions was studied from the results of interface reactions between MgO-TiO_2 and MgO-Al_2O_3. MgO・Al_2O_3-2MgO・TiO_2 solid solutions were detected at 1573-1673 K and increased with the firing temperature. 2MgO・TiO_2 was formed in the system MgO-TiO_2, but was not produced in the system MgO-TiO_2-Al_2O_3, because the amount of Mg diffusion at the interface of aggregate and matrix additives was not enough due to the large aggregate size of MgO. MgO・Al_2O_3 and 2MgO・TiO_2 formed at the interface between MgO-TiO_2 and MgO-Al_2O_3 decreased with the firing time at 1873 K. On the other hand, MgO・Al_2O_3-2MgO・TiO_2 solid solutions increased. Mg was recognized in the matrix without addition of MgO as a matrix. Al diffused in the layer of MgO-TiO_2, in opposition Ti diffused in the layer of MgO-Al_2O_3 by EPMA analysis. From the above results, the formation mechanism of a MgO・Al_2O_3-2MgO・TiO_2 solid solution was proposed; (1) Mg diffusion at the interface of MgO aggregate and matrix additives, (2) formation of MgO・TiO_2 and MgO・Al_2O_3, (3) formation of 2MgO・TiO_2 due to the reaction with MgO・TiO_2 and MgO, (4) reaction of the solid solution with MgO・Al_2O_3 and 2MgO・TiO_2. In the reactions between MgO・TiO2 and MgO-Al_2O_3 the product layer of MgO・Al_2O_3-2MgO・TiO_2 solid solution increased as the firing time increased. The diffusion coefficient of Mg was about 4.8×10^<-7>(cm^2/s), in a good agreement with that of Mg which was reported.
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谷野, 淳
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加野, 軒作 ; 植竹, 厚子 ; 清水, 栄 ; 新田, 啓一 ; 山本, 譲
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Metabolism of 6-methyl-2-thiouracil was studied in rats by using ^<14>C-labeled compound. Following the oral administration of 6-methyl-2-thiouracil [2-^<14>C] (490 mg/kg), the about 68% of the administered radioactivity was excreted in
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urine, 27% in feces, and 1.2% in respiratory CO_2 within 72 hr. After oral ingestion of the radioactive compound, radioactive substances excreted in urine after 48 hr were 6-methyl-2-thiouracil, 6-methyl-uracil, 6-methyl-2-methylthiouracil, 6-methyl-4-oxo-pyrimidine, 2-amino-6-methyl-4-oxopyrimidine, and urea which were present in about 46.2,9.1,1.6,1.8,0.2,and 0.8% of total radioactivity in the urine, respectively. In in vitro tests using rat liver slices, radioactivity was also detected in 5,6-dihydro-6-methyluracil along with the above metabolites.
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Ialnazov, Dimiter
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倉田, 悟
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金沢大学考古学研究会
概要:
能美丘陵周辺遺跡分布図
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宮下, 英明
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上野, 英雄
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