[en] ¹⁹⁷Au Moessbauer spectroscopy has been applied for the low-temperature β-phases of ternary systems, Ag_2-xAu_xX (X=S, and Se; x=0.2 and 0.5). The nature of linear X-Au-X bonds present in these systems is discussed on the basis of the Moessbauer data and the bond distances. (author)

[en] Purpose: The correlation between the DNA content, determined using fresh tumor tissues, and the macroscopic presentation of the lesion was studied prospectively in patients with T1 glottic carcinoma. Methods and Materials: DNA flow cytometry and fiber-optic endoscopic examination were performed for 30 previously untreated patients with T1 glottic carcinoma. The patients received radical radiotherapy at Aichi Cancer Center Hospital. Results: In regard to the type of lesion, 4 (80%) were aneuploid, and 1 (20%) was diploid for the invasive type. There was a tendency to show an invasive appearance in aneuploid tumors. With respect to clinical outcome, there were 3 (43%) local recurrences among the aneuploid tumors that invaded the entire length of one vocal cord, 0 (0%) for medium-sized lesions, and 1 (17%) for small lesions. Aneuploid tumors showed a high correlation between lesion size and local control. Conclusions: The correlation was not strong enough to conclude that DNA content can replace the macroscopic presentation of the lesion. However, the combination of DNA content and tumor size may help predict radiation sensitivity

[en] ¹⁹⁷Au and ¹²⁵Te Moessbauer spectroscopy has been applied for the low-temperature β-phase of Ag₃AuX₂ (X=S, Se, and Te). The values of I. S. and Q. S. for ¹⁹⁷Au suggest that the gold atoms, linearly coordinated by two chalcogen atoms in these phases, exist as monovalent cations. The ¹²⁵Te Moessbauer spectra suggest that the tellurium atoms are substantially ionic for both Ag₂Te and Ag₃AuTe₂. The nature of X-Au_x bonds is discussed on the basis of the Moessbauer data and the bond distances. (orig.)