introduction: streptomyces species are mycelial, aerobic gram-positive bacteria that are isolated from soil and produce a diverse range of antibiotics. streptomyces griseus produces the antibiotic, streptomycin and forms spores even in a liquid culture. the gene cluster for the production of streptomycin antibiotic contains strr gene that encodes strr, a pathway-specific regulator. then, this p...

Transduction of R factor 222, which carries four drug resistance markers (~0, strR, camR, totR), by phage P22 in Salmonella typhimurium results in the segregation of the drug resistance markers into tetR and the other three. The tetR marker was found to be integrated at proA near the P22 prophage attachment site of the recipient chromosome, confirming the previous result of Dubnau and Stocker (...

We present Strr omgren uvby and H photometry for a set of 575 northern main sequence A type stars, most of them belonging to the Hipparcos Input Catalogue, with V from 5 m to 10 m and with known radial velocities. These observations enlarge the catalogue we began to compile some years ago to more than 1500 stars. Our catalogue includes kinematic and astrophysical data for each star. Our future ...

Balhimycin, produced by the actinomycete Amycolatopsis balhimycina DSM5908, is a glycopeptide antibiotic highly similar to vancomycin, the antibiotic of 'last resort' used for the treatment of resistant Gram-positive pathogenic bacteria. Partial sequence of the balhimycin biosynthesis gene cluster was previously reported. In this work, cosmids which overlap the region of the characterized gene ...

In recent years, several authors have revised the calibrations used to compute physical parameters (Mv, T ee , log g, Fe=H]) from intrinsic colours in the uvbyH photometric system. For reddened stars, these intrinsic colours can be computed through the standard relations among colour indices for each of the regions deened by Strr omgren (1966) on the HR diagram. We present a discussion of the c...

We investigate the ability of primordial gas clouds to retain molecular hydrogen (H 2) during the initial phase of the reionization epoch. We nd that before the Strr omgren spheres of the individual ionizing sources overlap, the UV background below the ionization threshold is able to penetrate large clouds and suppress their H 2 abundance. The consequent lack of H 2 cooling could prevent the co...

It is well known that congestion control becomes more and more important in modern grid-based routing process. In this paper, a timing-constrained congestion-driven global routing approach is proposed to obtain initial congestion-driven global routing result without destroying the timing constraint of any routing net, and a post-processing simulated-annealingbased rip-up-and-reroute improvement...