Two-flux Colliding Plane Waves in String Theory

We construct the two-flux colliding plane wave solutions in higher dimensional gravity theory with dilaton, and two complementary fluxes. Two kinds of solutions has been obtained: Bell-Szekeres(BS) type and homogeneous type. After imposing the junction condition, we find that only Bell-Szekeres type solution is physically well-defined. Furthermore, we show that the future curvature singularity is always developed for our solutions.Comment: 16 pages, Latex; typoes corrected; references added, minor modification

The taming of the cat

Unlike other domesticated creatures, the house cat contributes little to human survival. Researchers have therefore wondered how and why cats came to live among people. Experts traditionally thought that the Egyptians were the first to domesticate the cat, some 3,600 years ago. But recent genetic and archaeological discoveries indicate that cat domestication began in the Fertile Crescent, perhaps around 10,000 years ago, when agriculture was getting under way. The findings suggest that cats started making themselves at home around people to take advantage of the mice and food scraps found in their settlements

Molecular characterisation of an outbreak strain of multiresistant Salmonella enterica serovar Typhimurium DT104 in the UK

ABSTRACTA major national outbreak of multiresistant Salmonella enterica serovar Typhimurium definitive phage type 104 (MR DT104) occurred in England and Wales in the summer of 2000. Isolates of MR DT104 were characterised by antimicrobial resistance type (R-type), pulsed-field gel electrophoresis (PFGE), plasmid profiling and fluorescent amplified fragment length polymorphism (fAFLP) analysis. Results of R-type, PFGE and fAFLP showed that summer 2000 outbreak-associated isolates were indistinguishable from most MR DT104 isolates collected in England and Wales during the 1980s and 1990s. However, outbreak-associated isolates all had an additional 2-MDa plasmid (PP D), and this distinct profile allowed outbreak cases to be distinguished from background MR DT104 infections, thereby facilitating the epidemiological investigation by improving the specificity of the case definition. The study demonstrated the highly clonal nature of MR DT104 and the importance of a hierarchical approach to molecular subtyping for outbreak investigations