Puintuplication of Room squares

Given a strong starter for a groupG of ordern, where 3 does not dividen, a construction is given for a strong starter for the direct sum ofG and the integers modulo 5. In particular, this gives a Room square of side 5p for all non-Fermat primesp.     

Molecule-based modeling of heavy oil

A molecular-level kinetics model has been developed for the pyrolysis of heavy residual oil. Resid structure was modeled in terms of three attribute groups: cores, inter-core linkages, and side chains. The concentrations of attributes were constrained by probability density functions (PDFs) that were optimized by minimizing the difference between the properties of the computational representation-which were obtained by juxtaposing the attributes-to measured properties, which were obtained by analytical chemistry measurements. Computational tools were used to build a reaction network that was constructed based upon model compounds and their associated kinetics. For cases with an intractable number of species, equations were written in terms of the three attribute groups and the molecular composition was retained implicitly through the juxtaposition. These modeling methods were applied to the Shengli and Daqing resids. The composition of the simulated molecular feedstock fit well with analytical chemistry measurements. After simulated pyrolysis, both resids showed representative increases in the weight fractions of lighter hydrocarbons. Relevant end-use properties were predicted for the product mixtures.     

Oxidopolyborate chemistry: The self-assembled,templated, synthesis,and an XRD study of a 1-D coordination polymer, [Cu(en){B6O7(OH)6}].3H2O (en = 1,2-diaminoethane)

Abstract

[Cu(en){B₆O₇(OH)₆}]^.3H₂O (1) (en = 1,2-diaminoethane), obtained as a crystalline solid in low yield (31%) after prolonged standing of an aqueous solution initially containing [Cu(en)₂](OH)₂ and B(OH)₃ (1:7 ratio), was characterized by thermal analysis (TGA/DSC), ¹¹B NMR and IR spectroscopy, powder XRD, and single-crystal XRD studies, and magnetic susceptibility measurements. The single-crystal X-ray diffraction revealed that the oxidoborate complex is a 1D coordination polymer with the hexaborate(2-) ligand bridging two hexacoordinate Cu^(II) centers, in an alternating a fac-tridentate (κ³-O) and monodentate (κ¹-O) arrangement. Cu-O coordination bonds and extensive H-bonding networks promote and stabilize the self-assembly of [Cu(en){B₆O₇(OH)₆}]^.3H₂O from the Dynamic Combinatorial Libraries of available reactants. [Cu(en){B₆O₇(OH)₆}]^.3H₂O is thermally decomposed to CuB₆O₁₀ in air at 700?°C.     

Antimon

Ohne Zusammenfassung     

Anti-IgG immobilized controlled-pore glass. Thionyl chloride-activated succinamidopropyl-glass as a covalent immobilization matrix.

Rabbit anti-bovine IgG was covalently immobilized on thionyl chloride-activated succinamidopropyl controlled-pore glass (CPG) beads (3000 A pore diam; 120/200 mesh). Thionyl chloride-activated beads remained stable for over 1 y retaining full capability of immobilizing protein upon recirculation of protein solution. The immobilized anti-bovine IgG is capable of binding IgG with a dissociation constant (Kd) of 9.45 x 10(-7) M and a capacity of 0.85 g/L of matrix. A column of immobilized anti-IgG is able to remove all detectable contaminating IgG from partially purified enzyme preparations of sulfhydryl oxidase and gamma-glutamyltransferase as determined by ELISA and Western blot. The column matrix could be regenerated by washing with 0.1M acetic acid, pH 2.8.