Soit P une opérade quadratique. On détermine une opérade associée P̃ ayant la propriété suivante, pour toute P-algèbre A et toute P̃-algèbre B alors A⊗B est une Palgèbre pour le produit classique. On s’intéresse ensuite au cas particulier des algèbres de Lie de courant en étudiant plus précisément la rigidité et les déformations. 1 Produit tensoriel de P-algèbres et de P -algèbres Soit P une opér...

echis carinatus (saw-scale viper) is one of the most venomous snakes in asia and some parts of the africa with deadly hemotoxic venom. it has been reported that suramin, an antitrypansomiasis drug, can inhibits the toxic effects of some snake venoms. this study was conducted to evaluate the antagonistic effects of suramin against the venom of the iranian snake echis carinatus. adult albino mice...

A new species of Streptomyces is described for which the name Streptomyces aculeolatus is proposed. The organism produces new antibiotics SF2415A1, A2, A3, B1, B2 and B3 active against Gram-positive bacteria. Empirical molecular formulae of the antibiotics SF2415A1, A2, A3, B1, B2 and B3 were determined to be C26H31N2O5Cl, C26H30N2O5, C26H30N2O5Cl2, C26H33O5Cl, C26H32O5 and C26H32O5Cl2, respect...

We investigate the bound states of the Yukawa potential V (r) = −λ exp(−αr)/r, using different algorithms: solving the Schrödinger equation numerically and our Monte Carlo Hamiltonian approach. There is a critical α = αC , above which no bound state exists. We study the relation between αC and λ for various angular momentum quantum number l, and find in atomic units, αC(l) = λ[A1 exp(−l/B1) + A...

The competitive antagonist a-conotoxin-MII (a-CTx-MII) is highly selective for the a3b2 neuronal nicotinic receptor. Other receptor subunit combinations (a2b2, a4b2, a3b4) are .200fold less sensitive to blockade by this toxin. Using chimeric and mutant subunits, we identified amino acid residues of a3 and b2 that participate in determination of a-CTx-MII sensitivity. Chimeric a subunits, constr...

Let p ≡ 1 (mod 4) be a prime. Let a, b ∈ Z with p a(a2 + b2). In the paper we mainly determine ( b+ √ a2+b2 2 ) p−1 2 (mod p) by assuming p = c2 + d2 or p = Ax2 + 2Bxy + Cy2 with AC − B2 = a2 + b2. As an application we obtain simple criteria for εD to be a quadratic residue (mod p), where D > 1 is a squarefree integer such that D is a quadratic residue of p, εD is the fundamental unit of the qu...

We investigate the bound states of the Yukawa potential V (r) = −λ exp(−αr)/r, using different algorithms: solving the Schrödinger equation numerically and our Monte Carlo Hamiltonian approach. There is a critical α = αC , above which no bound state exists. We study the relation between αC and λ for various angular momentum quantum number l, and find in atomic units, αC(l) = λ[A1 exp(−l/B1) + A...