We compared the ultraviolet radiation-induced reversion of nonsense (lacZ53) and missense (leuB19) mutations in uvrB5, uvrB5 uvrD3, uvrB5 recB21, and uvrB5 uvrD3 recB21 strains of Escherichia coli K-12. Nonsense (trpE65) reversion was also compared in similar derivatives of E. coli B/r uvrA155. The uvrD mutation reduced mutagenesis in very case, but had its main effect in cells ultraviolet irra...

Title of thesis: COMPARING REGIME-SWITCHING MODELS IN TIME SERIES: LOGISTIC MIXTURES: vs. MARKOV SWITCHING Dimitrios V. Paliouras Master of Science, 2007 Thesis directed by: Professor Benjamin Kedem Department of Mathematics The purpose of this thesis is to review several related regime-switching time series models. Specifically, we use simulated data to compare models where the unobserved stat...

austenitic stainless steels are extensively used in various applications requiring good corrosion resistance and formability. in the current study, the formation of nano/ ultrafine grained austenitic microstructure in a microalloyed aisi 304l stainless steel was investigated by the advanced thermomechanical process of reversion of strain-induced martensite. for this purpose, samples were subjec...