For a non-negative integer k, we say that a language L is k-poly-slender if the number of words of length n in L is of order O(n k). We give a precise characterization of the k-poly-slender context-free languages. The well-known characterization of the k-poly-slender regular languages is an immediate consequence of ours.

At present, most of the important computational problems—be they decision, search, or optimization problems—are known to satisfy one of the following two criteria: 1. The problem can be solved in polynomial time with respect to the input size n, where the degree of the polynomial is small enough to guarantee that the problem can be tackled efficiently in practice. In particular, the decision ve...

  A total of 60 neck skin swab samples were taken from 12 different broiler flocks after the chilling stage of processing at a commercial broiler slughtering facility in Mashhad. The presence of Salmonella was assessed by conventional culture method and confirmed by using poly O and poly H antiserum in serotyping. PCR amplification of invA gene as a specific method for detection of Salmonella w...

       The purpose of this study was to investigate the effect of additives, poly(ethylene glycol) (PEG) 1450, poloxamer 407, polyvinyl alcohol (PVA) and sodium chloride in order to improve physico-chemical characteristics, encapsulation efficiency and in vitro release of bovine serum albumin, form poly(D,L-lactic-co-glycolic acid) (PLGA) microparticles prepared by the w/o/w solvent evaporation...

Poly(o-anisidine) molybdophosphate was expediently obtained by sol-gel mixing of Poly(o-anisidine) into the inorganic matrices of molybdophosphate, which was allowed to react with silver nitrate to the formation of poly(o-anisidine) molybdophosphate embedded silver nano composite. The composite was characterized by Fourier Transform Infrared Spectroscopy, X-ray powder diffraction, UV-Vis Spectr...

In the title compound, [Na(C(6)H(5)NH)(C(4)H(10)O(2))], the Na(+) cation is coordinated by the N atoms of two anilide anions, two O atoms of a chelating 1,2-dimeth-oxy-ethane (dme) ligand and one O atom of an adjacent dme ligand. The coordination polyhedron around Na(+) corresponds to a distorted square pyramid with the N atoms of the anilide groups and the O atoms of the chelating dme unit at ...

In the title compound, {[Cu(2)(C(4)H(2)O(4))(2)(H(2)O)(2)]·3H(2)O}(n), Cu(II) ions with square-pyramidal coordination are bridged by exo-tri-dentate maleate dianions into [Cu(2)(maleate)(2)(H(2)O)(2)](n) layers coincident with the bc crystal plane. The inter-lamellar regions contain hydrogen-bonded cyclic water hexa-mers which facilitate layer stacking into a pseudo-three-dimensional crystal st...

The title compound, [Cd(C(8)H(4)O(5))(H(2)O)(3)](n), a one-dimensional chain complex of 5-hy-droxy-isophthalate with Cd(II), was prepared by a hydro-thermal reaction. The Cd(II) ion is coordinated by three water O atoms and three carboxyl-ate O atoms of two different 5-hy-droxy-isophthalate ligands, which act as bidentate and monodentate ligands. The crystal structure is stabilized by O-H⋯O hyd...

In the title compound, [Cu(C(4)H(5)O(4))(H(2)O)](n), the imino-diacetate (ida) ligands link the Cu(II) atoms into polymeric zigzag chains running along [010]. Each Cu(II) ion is five-coordinated in a distorted square-pyramidal geometry by one N and two O atoms from an ida ligand, one O atom from the neighbouring ida ligand and one water O atom. In the crystal, the polymeric chains are held toge...

In the title compound, {[Mn(C(8)H(4)O(4))(C(10)H(8)N(2))(H(2)O)]·H(2)O}(n), the Mn(II) centre is octa-hedrally coordinated by three O atoms from two 5-methoxy-isophthalate (CH(3)O-ip) ligands, a fourth from a coordinated water mol-ecule and two N atoms from one chelating 2,2'-bipyridine (2,2-bipy) ligand. Each pair of adjacent Mn(II) atoms is bridged by a CH(3)O-ip ligand, forming a helical cha...