Polymetallation of alkenes: Formation of some complexes containing branched chain carbon-rich ligands

Reactions of {(Ph₃P)AuCC}₂CC{CCAu(PPh₃)}₂ (1b), with Co₃(μ-CBr)(μ-dppm)_n(CO)_9−2n (n = 0, 1) result in complete or partial elimination of AuBr(PPh₃) to give the complexes {(OC)₉Co₃-μ₃-CCC}₂CC{CC-μ₃-CCo₃(CO)₉}₂ (3), trans-{(OC)₇(μ-dppm)Co₃-μ₃-CCC}(HCC)CC{CCAu(PPh₃)}{CC-μ₃-CCo₃(μ-dppm)(CO)₇} (4), {(OC)₇(μ-dppm)Co₃-μ₃-CCC}₂CC(CCH){CC-μ₃-CCo₃(μ-dppm)(CO)₇} (5) and {(OC)₇(μ-dppm)Co₃-μ₃-CCC}₂CC{CCAu(PPh₃)}{CC-μ₃-CCo₃(μ-dppm)(CO)₇} (6), which have been identified by spectroscopic methods and in the cases of 3, 4 and 5, by single-crystal X-ray diffraction methods.     

Mesoscopic simulation of an ionomeric membrane based on sulfonated aromatic poly(ether ether ketone)

Mesoscopic simulation in the framework of the mesoscopic dynamics method (a version of the dynamic density functional method) was performed for a proton conducting membrane based on sulfonated aromatic poly(ether ether ketone) in a wide range of water content in the system. For the selected parametric field, the model demonstrates microphase separation of hydrophilic and hydrophobic segments of the polymer. In the bulk of the membrane, a spatial network of water channels forms, whose walls consist of polar (sulfonated) units of the macromolecule. Independent molecular dynamics simulation for one set of parameters gives close values of the structural characteristics of the membrane, which confirms the correctness of the mesoscopic model.     

Interpolation of rational functions by simple partial fractions

We study a generalized interpolation of a rational function at n nodes by a simple partial fraction of degree n and reduce the consideration to the solvability question for a special difference equation. We construct explicit interpolation formulas in the case where the equation order is equal to 1. We show that for functions A(x − a) ^m , m ? \mathbbN m \in \mathbb{N} , it is possible to reduce the consideration to a system of m + 1 independent first order equations and construct explicit interpolation formulas. Bibliography: 6 titles.     

Effect of ionic impurities on the primary nucleation of potassium sulphate solutions

A technique is described for rapidly assessing the effect of impurities on primary nucleation in solutions. The influence of Ca²⁺, Sr²⁺, Ba²⁺, Ag⁺, Pb²⁺, Cr³⁺ and Ni²⁺ on the nucleation of potassium sulphate solutions is discussed. It is generally observed that a discontinuity in the behaviour of the impurity occurs at an impurity concentration corresponding to the solubility of the “impurity sulphate” in the solution under investigation.     

A note on contributions concerning nonseparable spaces with respect to signal processing within Bayesian frameworks

In this paper, we discuss the study of some signal processing problems within Bayesian frameworks and semigroups theory, in the case where the Banach space under consideration may be nonseparable. For applications, the suggested approach may be of interest in situations where approximation in the norm of the space is not possible. We describe the idea for the case of the abstract Cauchy problem for the evolution equation and provide more detailed example of the diffusion equation with the initial data in the nonseparable Morrey space.     

Silk Meshes Coated with Chitosan-Bioactive Phytochemicals Activate Wound Healing Genes In Vitro

Meshes from natural silk are hand knitted and surface functionalized to facilitate hernia repair and other load bearing, tissue applications. Purified organic silk is - hand knitted and then coated with chitosan (CH)/bacterial cellulose (BC) blend polymer using four phytochemicals such as pomegranate (PG) peel, Nigella sativa (NS) seed, Licorice root (LE), and Bearberry leaf extracts (BE) separately. Characterizations using GCMS analysis shows the presence of bioactive chemicals in the extracts. Scanning electron microcopy (SEM) shows that the surface is coated with the composite polymer t. Fourier transform infrared spectroscopy (FTIR) shows significant elements found in CH, BC, and phytochemicals in plant extracts with no chemical changes. Tensile strength of the coated meshes is higher to support tissue as implants. The release kinetics suggest sustained release of phytochemical extracts. In vitro studies confirmed the noncytotoxic, biocompatible, wound healing potential of the meshes. Furthermore, gene expression analysis of 3-wound healing genes shows marked increase in the in vitro cell cultures due to the presence of extracts. These results suggest that the composite meshes can efficiently support hernia closure while facilitating wound/tissue healing and combating bacterial infections. Therefore, these meshes can be good candidates for fistula and cleft palate repair.