Objective(s) Theophylline, a xanthenes derivative, is still widely used as an effective bronchodilator in the management of asthmatic patients. It is used both as a prophylactic drug and to prevent acute exacerbations of asthma. The aim of study was to formulate and evaluate effect of the microencapsulation of theophylline loaded nanoparticles on the reduction of burst release. Materials and Me...

In this work, poly (o-Anisidine) (POA) was prepared by consecutive potential cycling in an acidic monomer solution at the surface of Carbon Paste Electrode (CPE). Nickel ions were dispersed into the polymer by immersing the electrode in NiSO4 solution. The prepared Ni/POA/CPE was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, Atomic Force Mic...

The two-dimensional coordination polymeric structures of the hydrated potassium and rubidium salts of (3,5-di-chloro-phen-oxy)acetic acid (3,5-D), namely, poly[μ-aqua-bis-[μ3-2-(3,5-di-chloro-phen-oxy)acetato]-dipotassium], [K2(C8H5Cl2O3)2(H2O)] n , and poly[μ-aqua-bis-[μ3-2-(3,5-di-chloro-phen-oxy)acetato]-dirubidium], [Rb2(C8H5Cl2O3)2(H2O)] n , respectively, have been determined and are descr...

In this paper, we study the problem of L1-fitting a circle to a set of points in the plane, where the target function is the sum of distances of the points to the circle. We show an (1 + ε)-approximation algorithm, with running time O(n + poly(log n, 1/ε)), where poly(log n, 1/ε) is a constant degree polynomial in log n and 1/ε. This is the first subquadratic algorithm for this problem.

Quantum simulation is a prominent application of quantum computers. While there extensive previous work on simulating finite-dimensional systems, less known about algorithms for real-space dynamics. We conduct systematic study such algorithms. In particular, we show that the dynamics $d$-dimensional Schr\"{o}dinger equation with $\eta$ particles can be simulated gate complexity $\tilde{O}\bigl(...

This paper describes calculations on the packing energy in the crystal st ructures of/5-forms of polyglycine and poly-L-alanine. It is shown that the non-bonded interactions between fl-chains, in a pleated sheet structure, yields a minimum energy when the interchain spacing is about 4.8 A, which is well-suited for the formation of interchain NH. • • O hydrogen bonding. The attempts made to dedu...

The electrostatic combination of a Keplerate cluster, [Mo(132)O(372)(CH(3)COO)(30)(H(2)O)(72)](42-) with cationic terminated poly(styrene) yields polyoxometalate-based supramolecular star polymers, which can further self-assemble into vesicular aggregates in CHCl(3)-MeOH mixed solvent.

Poly(aryl ether amide) containing o-nitroanilide forms a physical gel in polar aprotic solvents by solvent-induced change of hydrogen bonding modes, in which hydrogen bonding acceptor solvent molecules break intramolecular hydrogen bonding of o-nitroanilide and induce intermolecular hydrogen bonding.

The heterometallic alkoxide catena-poly[[tetra-mu2-tert-butoxo-1:2kappa4O:O;1:3kappa4O:O-bis(tetrahydrofuran)-2kappaO,3kappaO-iron(III)dilithium(I)]-mu-bromo], [FeLi2Br(C4H9O)4(C4H8O)2]n, forms a one-dimensional chain through an a-glide. This conformation is achieved through the formation of Fe(III)/O/Li/O rings and Li-Br-Li bridges.