نتایج جستجو برای: polybiphenyl alkylene
تعداد نتایج: 169 فیلتر نتایج به سال:
Alicyclic quaternary ammonium cations having all the β-protons in a strain-free ring structure are general highly base-resistant and thus very attractive to employ for anion exchange membrane (AEM) applications. However, tethering such as N,N-dimethylpiperidinium (DMP) polymer backbones without introducing any weak links is quite challenging. In present study, we have attached pairs of piperidi...
para-Selective processes for the chlorination of phenols using sulphuryl chloride in presence various sulphur-containing catalysts have been successfully developed. Several chlorinated phenols, especially those derived by para-chlorination phenol, ortho-cresol, meta-cresol, and meta-xylenol, are significant commercial importance, but reactions such not always as regioselective would be desirabl...
Poly(alkylene oxide)-type block copolymers have been recently shown to be particularly versatile as structure-directing agents for the preparation of ordered large-pore mesoporous silica materials. In principle, the structure direction is achieved through the formation of periodic supramolecular self-assemblies between the polymeric surfactants and a silica source in the aqueous solution. The o...
BACKGROUND Resorbable bone hemostasis materials, oxidized regenerated cellulose (ORC) and microfibrillar collagen (MFC), remain at the site of application for up to 8 weeks and may impair osteogenesis. Our experimental study compared the effect of a water-soluble alkylene oxide copolymer (AOC) to ORC and MFC versus no hemostatic material on early bone healing. METHODS Two circular 2.7 mm non-...
The interaction of symmetrical lidocaine dimers with voltage-gated Na+ channels (VGSCs) was examined using a FLIPR membrane potential assay and voltage-clamp. The dimers, in which the tertiary amines of the lidocaine moieties are linked by an alkylene chain (two to six methylene units), inhibited VGSC activator-evoked depolarization of cells heterologously-expressing rat (r) Na(v)1.2a, human (h...
Recently, alkylene-linked heterodimers of tacrine (1) and 5-amino-5,6,7,8-tetrahydroquinolinone (2, hupyridone) were shown to exhibit higher acetylcholinesterase (AChE) inhibition than either monomeric 1 or 2. Such inhibitors are potential drug candidates for ameliorating the cognitive decrements in early Alzheimer patients. In an attempt to understand the inhibition mechanism of one such dimer...
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