The solutions of Einstein’s equations admitting one non-null Killing vector field are best studied with the projection formalism of Geroch. When the Killing vector is lightlike, the projection onto the orbit space still exists and one expects a covariant theory with degenerate contravariant metric to appear, its geometry is presented here. Despite the complications of indecomposable representat...

1. Among the commonest sexual signals of birds are the red-yellow traits pigmented by carotenoids, but how they reliably advertise individual quality remain poorly understood. Here we tested the hypothesis that carotenoid-based signalling is enhanced by testosterone but reduced by parasites, and that the dual action of testosterone on ornament expression and parasite resistance ensures reliable...

Abstract In recent years the quest for a circular economy approach and upcycling of secondary raw materials have been pushed in global political agenda. Increased interest has taken by recovery from sludges, brines, contaminated waters other media, all included larger umbrella identified as “low-grade” mineralisation. Contaminated soils an interesting role this process, various methodologies de...

We present a global analysis of the geometries that arise in non-compact current algebra (or gauged WZW) coset models of strings and particles propagating in curved space-time. The simplest case is the 2d black hole. In higher dimensions these geometries describe new and much more complex singularities. For string and particle theories (defined in the text) we introduce general methods for iden...

Prokaryotic autotrophs have a key role in maintaining the sustainability of nature. Their secondary metabolites and stored chemicals wide utility human life. Cyanophytes, primitive producers, can become necessity modern world as they enormous unexplored features. Candida albicans, an opportunistic pathogen having multidrug resistance, fallout health concerns animal hosts. This study focused on ...