Utilization of Grape Seed Flour for Antimicrobial Lipopeptide Production by Bacillus amyloliquefaciens C5 Strain

Applied Biochemistry and Biotechnology - An endophytic Bacillus amyloliquefaciens strain called C5, able to produce biosurfactant lipopeptides with a broad antibacterial activity spectrum, has been...     

Comportement à très basses énergies de la densité d'états intégrée du modèle d'Anderson non borné inférieurement

We obtain a complete asymptotic expansion of the integrated density of states of the unbounded Anderson model at low energies. We also study the evolution of this asymptotic when the decay of the tail of the distribution of the random potential increases. To cite this article: O. Saad, C. R. Acad. Sci. Paris, Ser. I 338 (2004).     

Manganese ferrite (MnFe2O4) as potential nanosorbent for adsorption of uranium(VI) and thorium(IV)

Journal of Radioanalytical and Nuclear Chemistry - The adsorption behavior of U(VI) and Th(IV) metal ions by MnFe2O4 NPs was studied as a function of pH, mass of sorbent, contact time, and...     

The first DMAP-mediated palladium-free Tsuji-Trost-type reaction of cyclic and acyclic Baylis-Hillman alcohols with active methylene compounds

Direct allylic substitution of cyclic Baylis-Hillman alcohols with active methylene compounds under modified Taber’s conditions (DMAP, toluene, reflux, 4 Å molecular sieves), with no Pd catalysts/activating agents, as is usually required for the process, affords the C-allylation products in moderate to good yields.     

Production of Anti-Methicillin-Resistant <Emphasis Type="Italic">Staphylococcus</Emphasis> Activity from <Emphasis Type="Italic">Bacillus subtilis</Emphasis> sp. Strain B38 Newly Isolated from Soil

B38 bacterial strain, isolated from Tunisian soil showed a strong antimicrobial activity. Based on biochemical characterization and 16S rDNA sequence analysis, B38 strain was identified as Bacillus subtilis. Cell culture supernatant showed antibacterial activity against clinical isolates of methicillin-resistant Staphylococcus species and several Gram-positive and Gram-negative bacteria. Antifungal activity against phytopathogenic fungi was also observed. Antibacterial activity production started at early exponential growth phase, and maximum activity was reached at the stationary phase. This antibacterial activity was neither affected by proteases, lipase, and organic solvents, nor by surfactants. It was stable over a wide pH range and still active after autoclaving at 121 °C during 20 min. Thin layer chromatography followed by bioautography assay allowed the detection of four active spots with R _f values of 0.30, 0.47, 0.70, and 0.82. The single spot with R _f 0.30 showed antifungal activity, whereas the spots with R _f values of 0.47, 0.70, and 0.82 exhibited antibacterial activity.     

Sliding Presentation of the Jeux de Taquin for Classical Lie Groups

The simple \(GL(n,\mathbb {C})\)-modules are described by using semistandard Young tableaux. Any semistandard skew tableau can be transformed into a well defined semistandard tableau by a combinatorial operation, the Schützenberger jeu de taquin. Associated to the classical Lie groups \(SP(2n,\mathbb {C})\), \(SO(2n+1,\mathbb {C})\), there are other notions of semistandard Young tableaux and jeux de taquin. In this paper, we study these various jeux de taquin, proving that each of them has a simple and explicit formulation as a step-by-step sliding. Any of these jeux de taquin is the restriction of the orthogonal one, associated to \(SO(2n+1,\mathbb {C})\).