Binary black hole spacetimes with a helical Killing vector, which are discussed as an approximation for the early stage of a binary system, are studied in a projection formalism. In this setting the four dimensional Einstein equations are equivalent to a three dimensional gravitational theory with a SL(2, C)/SO(1, 1) sigma model as the material source. The sigma model is determined by a complex...

The stability and other physical properties of a class regular black holes, quasiblack electrically charged compact objects are investigated in the present work. obtained by solving Einstein-Maxwell system equations assuming spherical symmetry static spacetime. spacetime is split two regions surface coordinate radius $a$. interior region contains nonisotropic fluid with de Sitter type equation ...

We construct a sigma model in two dimensions with Galilean symmetry in flat target space similar to the sigma model of the critical string theory with Lorentz symmetry in 10 flat spacetime dimensions. This is motivated by the works of Gomis and Ooguri[1] and Danielsson et. al.[2, 3]. Our theory is much simpler than their theory and does not assume a compact coordinate. This Non-Relativistic str...

We present the experimentally determined 3D structure of an intact activator-dependent transcription initiation complex comprising the Escherichia coli catabolite activator protein (CAP), RNA polymerase holoenzyme (RNAP), and a DNA fragment containing positions -78 to +20 of a Class I CAP-dependent promoter with a CAP site at position -61.5 and a premelted transcription bubble. A 20-A electron ...

Binary black hole spacetimes with a helical Killing vector, which are discussed as an approximation for the early stage of a binary system, are studied in a projection formalism. In this setting the four dimensional Einstein equations are equivalent to a three dimensional gravitational theory with a SL(2, C)/SO(1, 1) sigma model as the material source. The sigma model is determined by a complex...

In response to starvation, Myxococcus xanthus initiates a developmental program that results in the formation of spore-filled, multicellular fruiting bodies. Many developmentally regulated genes in M. xanthus are transcribed from sigma(54) promoters, and these genes require enhancer-binding proteins. Here we report the finding of an unusual group of 12 genes encoding sigma(54)-dependent enhance...

Factor analysis (FA) or principal component (PCA) models the covariance matrix of observed data as R = SS' + {\Sigma}, where is low-rank factors (aka latent variables) and {\Sigma} diagonal noise. When noise anisotropic nonuniform in signal processing literature heteroscedastic statistical literature), elements cannot be assumed to identical they must estimated jointly with SS'. The problem est...

The formation of low stratus cloud over idealized hills is investigated using numerical model simulations. main driver for the radiative cooling due to outgoing longwave radiation. Despite a purely horizontal flow, advection terms in prognostic equations heat and moisture produce vertical mixing across upper edge, leading loss water content. This behavior depicted via budget analysis. More prec...

By a quantitative Western immunoblot analysis, the intracellular levels of two principal sigma subunits, sigma 70 (sigma D, the rpoD gene product) and sigma 38 (sigma S, the rpoS gene product), and of two minor sigma subunits, sigma 54 (sigma N, the rpoN gene product) and sigma 28 (sigma F, the rpoF gene product), were determined in two Escherichia coli strains, W3110 and MC4100. The results in...