Effect of excess Au on antiphase domain growth in Cu \u3c inf\u3e 3 Au

The kinetics of antiphase domain growth have been studied in three nonstoichiometric Cu3Au alloys containing nominally 26, 28, and 31.5 at. pct Au. During isothermal annealing of disordered samples below the critical temperatures, the domain growth in all of the alloys initially followed the same t 1/2 dependence found previously for stoichiometric Cu3Au. At long times, the two alloys furthest off stoichiometry reached limiting domain sizes which decreased with increasing Au content. Although the role of the excess Au in determining these limiting sizes is not clear, it is evident that most of the excess Au is accommodated within the domains. The antiphase domain size distributions in the alloys agree with those found for the stoichiometric alloy. © 1975 The Minerals, Metals & Materials Society - ASM International - The Materials Information Society

Untersuchung zur Wirkung ultravioletter Strahlung im Bereich zwischen 289 nm und 334 nm auf eukariontische Zellen Schlussbericht

In a study on the effect of monochromatic and polychromatic UV light on eukaryontic cells the following action spectra were determined: (I) Action spectras for the inactivation and mutation induction for the ouabain resistance in Chinese hamster cells between 254 nm and 313 nm, as well as under simulated sunlight, (II) action spectra for the induction of sister chromatid exchanges in Chinese hamster cells, (III) action spectra for the inactivation and mutation induction for cavanine resistance in yeast between 254 nm and 334 nm, as well as under simulated sunlight. Action spectra III closely resemble the absorption spectra of DNA, which is regarded as the primary chromophore. Discrepancies between calculated and measured actions of simulated sunlight point to an effective repair mechanism in yeast cells. Spectra II and I are interpreted by assuming another chromophore. In addition, in the case II an absorption by proteins is discussed. The effect of natural sunlight can be described as an additive action by light of the different wavelengths. An interaction with UV light cannot be excluded. (WEN)Available from TIB Hannover: F94B1847+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman