Investigating residual rhoticity in a non-rhotic accent

This paper reports on preliminary findings of a study conducted in the Black Country area of the west midlands of England. The small number of linguistic studies carried out in this region in the last 40 years have not found evidence of the continuing existence of variable rhoticity in the local speech variety. The Survey of English Dialects in the 1950s found low levels of rhoticity among speakers in the location closest to the Black Country, and I examine here similar findings from a detailed study of the variety, carried out between 2003-2006.

A model for the modular evolution of rna addressing open questions on the origin of life

A main unsolved problem in the RNA world scenario for the origin of life is how a template-dependent RNA polymerase ribozyme emerged from short RNA oligomers generated by random polymerization of ribonucleotides (Joyce and Orgel 2006). Current estimates establish a minimum size about 165 nt long for such a ribozyme (Johnston et al. 2001), a length three to four times that of the longest RNA oligomers obtained by random polymerization on clay mineral surfaces (Huang and Ferris 2003, 2006). To overcome this gap, we have developed a stepwise model of ligation-based, modular evolution of RNA (Briones et al. 2009) whose main conceptual steps are summarized in Figure 1. This scenario has two main advantages with respect to previous hypotheses put forward for the origin of the RNA world: i) short RNA....