background: sigma factors are proteins that regulate transcription in bacteria. sigma factors can be activated in response to different environmental conditions. the rpos (rna polymerase, sigma s) gene encodes sigma-38 (σ38, or rpos), a 37.8 kda protein in pseudomonas aeruginosa (p. aeruginosa) strains. rpos is a central regulator of the general stress response and operates in both retroactive ...

In this paper we proceed with the multiscale analysis of semilinear damped stochastic wave motions. The is made by combining well-known sigma convergence method its counterpart, associated to some compactness results such as Prokhorov and Skorokhod theorems. We derive equivalent model, which same type micro-model. One novelties work that corrector problem solved in classical sense distributions...

In this paper, at first for a given set of real or complex numbers $sigma$ with nonnegative summation, we introduce some special conditions that with them there is no nonnegative tridiagonal matrix in which $sigma$ is its spectrum. In continue we present some conditions for existence such nonnegative tridiagonal matrices.

Two sigma factors, sigma 35 and sigma 28, direct transcription from the Bt I and Bt II promoters of the cryIA(a) gene of Bacillus thuringiensis; this gene encodes a lepidopteran-specific crystal protoxin. These sigma factors were biochemically characterized in previous work (K. L. Brown and H. R. Whiteley, Proc. Natl. Acad. Sci. USA 85:4166-4170, 1988; K. L. Brown and H. R. Whiteley, J. Bacteri...

As Bacillus subtilis proceeds through sporulation, the principal vegetative cell sigma subunit (sigma(A)) persists in the cell but is replaced in the extractable RNA polymerase (RNAP) by sporulation-specific sigma factors. To explore how this holoenzyme changeover might occur, velocity centrifugation techniques were used in conjunction with Western blot analyses to monitor the associations of R...

In this paper, we propose a novel computational method for solving non-linear optimal control problems. The is based on the use of Fourier–Hermite series approximating action-value function arising in dynamic programming instead conventional Taylor-series expansion used differential (DDP). coefficients can be numerically computed by using sigma-point methods, which leads to class methods. We al...

The causes behind achieving different economic growth rates have been a major focus of economic research for a long time now, the result of which are various growth theories: from the Harrod-Domar model based on the capital accumulation to the modern, endogenous theories that emphasize the role of technological progress (Romer, 1986, 1990 ) and human capital (Lucas, 1988). It is well known that...