The fixation of a beneficial mutation represents the first step in adaptation, and the average effect of such mutations is therefore a fundamental property of evolving populations. It is nevertheless poorly characterized because the rarity of beneficial mutations makes it difficult to obtain reliable estimates of fitness. We obtained 68 genotypes each containing a single fixed beneficial mutati...

From the strain 51W of Pseudom onas fluorescens living under extrem e conditions at the Schirm acher Oasis (A ntarctica) a pyoverdin was obtained. Its structure was elucidated by chemical degradation and spectroscopic methods. The NM R data of the pyoverdin and of its G a(III) complex were com pared. A ppreciable influences of the m etal on the chemical shifts of the atom s at its binding sites...

The effects of temperature and inoculum density of Fusarium oxysporum f. sp. ciceris race 5 on suppression of Fusarium wilt in chickpea (Cicer arietinum) cv. PV 61 by seed and soil treatments with rhizobacteria isolated from the chickpea rhizosphere were studied in a model system. Disease development over a range of temperatures (20, 25, and 30 degrees C) and inoculum densities (25 to 1,000 chl...

Pseudomonas sp. strain WP001 is a laboratory isolate capable of polyurethane polymer degradation and harbors a predicted lipase precursor gene. The genome of strain WP001 is 6.15 Mb in size and is composed of seven scaffolds with a G+C content of 60.54%. Strain WP001 is closely related to Pseudomonas fluorescens based on ribosomal DNA comparisons.

Three kinds of lipases (from Candida antarctica, Pseudomonas cepacia, and Pseudomonas fluorescens) were encapsulated in inorganic matrices by the sol-gel method in order to synthesize chiral compounds by kinetic resolution. Sol-gel lipases prepared with vinyltriethoxysilane had higher hydrolysis activity for 2-octyl acetate than those with other silane precursors: tetramethoxysilane, methyltrim...

The complete genome sequences of four Pseudomonas fluorescens bacteriophages, UNO-SLW1 to UNO-SLW4, isolated from freshwater samples, are 39,092 to 39,215 bp long. The genomes are highly similar (identity, >0.995) but dissimilar from that of Pseudomonas phage Pf-10 (the closest relative, 0.685 to 0.686 identity), with 48 to 49 protein-coding genes and 66 regulatory sites predicted.

This communication focuses on the efficacy of a specific lytic phage, phage Phi S1, as a control agent of Pseudomonas fluorescens biofilms. The effect of phage infection temperature and the host growth temperature were evaluated. The results obtained showed that the phage infection process was temperature dependent and that the optimum temperature of infection of planktonic cells and biofilms w...