The purpose of this study was to investigate the influence aging on properties high-density polyethylene (HDPE) reinforced with multi-wall carbon nanotubes (MWCNTs). Nanocomposites were prepared at 0, 1, 3, and 5 wt%. long-term durability materials evaluated by thermo-oxidative test. Test bodies aged 110°C for up 10 weeks. nanocomposites characterized differential scanning calometry, thermograv...

Abstract The details of the lignocellulose deconstruction processes in digestive systems wood-feeding insects remain elusive. This study aimed to examine biochemical conversion system a anobiid beetle, Nicobium hirtum, one most important pests wooden products Japan. To this end, N. hirtum larvae were fed with Japanese red pine (softwood) and beech (hardwood) sapwood diets, as well an artificial...

Grapevine canes are vine growing byproducts studied for their antimicrobial activities. These properties directly connected to the stilbene content; oligomeric stilbenes being most active. In this study, we propose a chemical process, based on oxidative coupling, using metals increase oligostilbene rate and biological effectivity of cane extract against grapevine pathogens. A total ten compound...

The reactivity of the racemic N-heterocyclic stannylene [{MeHCN(tBu)}Sn] (1) with chalcogenide elements O2, S, Se, and Te has been investigated. In case reaction 1 molecular oxygen, cyclic tristannoxane complex [{MeHCN(tBu)}2Sn(μ-O)]3 (3) was isolated characterised. NMR studies (1H, 13C, 119Sn) show formation D3- C2- symmetric assemblies. Te, respectively, yielded cyclo-distannachalcogenide com...

Z. Naturforsch. 53 b, 573-580 (1998); received March 30, 1998 Silicon, Germanium, Tin, Sulfur Diimides, Heterocycles, NMR Data Two tetrakis(sulfurdiimido)silanes [Si(NSNR)4 (R = rBu la, SiMe3 lb)], two germanes [Ge(NSNR)4 (R = rBu 2a, SiMe3 2b)] and one stannane [Sn(NSN?Bu)4Sn 3a] were prepared and characterised by 'H, l3C, i5N, 29Si and ll9Sn NMR spectroscopy in solution, and 3a was also studi...

During the lignification of grass cell walls, ferulate acts like a nucleation site that can cross couple with monolignols, i.e. coniferyl alcohol and sinapyl alcohol, to form dimeric products. Here we investigated in detail ferulate-sinapyl cross-coupling products an effort on better understanding nature scope lignin-ferulate interactions. In biomimetic oxidative system, (SA) reacted ethyl (FA)...

BACKGROUND Mesenteric ischemia-reperfusion induces gut mucosal damage. Intestinal mucosal wounds are repaired by epithelial restitution. Although many different molecular mechanisms have been shown to affect cell metabolism under oxidative conditions, these molecular mechanisms and metabolic phenotypes are not well understood. Nuclear magnetic resonance (NMR) spectroscopic data can be used to s...

Venenum Bufonis, a well-known traditional Chinese medicine, has been widely used in Asia and has gained popularity in Western countries over the last decade. Venenum Bufonis has obvious side effects that have been observed in clinical settings, but few studies have reported on its cardiotoxicity. In this work, the cardiotoxicity of Venenum Bufonis was investigated using a 11H NMR-based metabolo...

Piracetam was subjected to the hydrolytic, oxidative, thermal and photolytic stress, according to ICH guideline Q1A (R2). The drug depicted degradation only in basic conditions, while it was stable to other stress conditions (acidic, neutral hydrolysis, thermal and photolytic conditions). A total of one degradation product was formed, which were separated on a BEH column employing an isocratic ...

An azine monomer 4-hydroxy-3-methoxybenzaldehyde azine was synthesized by refluxing with ethanolic solution of vanillin with hydrazine hydrate. It was then converted into polyazine by oxidative polymerization. The structure of azine and polyazine was characterized by FT-IR, UV-visible, 1H-NMR and 13C-NMR. Spectral results suggest the formation of polymer, through C-C and C-O-C coupling of the p...