The stability of nitrocellulose can be significantly improved by incorporating two novel polymeric compounds as new stabilizers, each has two p-substituted phenyl rings in its repeating unit. The two prepared polymers were used independently and in three different blend ratios in comparison with...

A practical and chemoselective method is described for the O-methylation of carboxylic acids. Dimethyl malonate, a low toxic and commercially available compound was found to be an effective methylating reagent for a variety of carboxylic acids affording methyl ester products in good to high yiel...

A series of novel heteroarylidene malonate derived bis(thiazoline) ligands 1 and 2 were synthesized and applied to a Friedel–Crafts reaction between indole and alkylidene malonate. The Cu(OTf)2 complex of ligand 2b bearing a benzyl group afforded moderate to excellent enantioselectivity for the...

Four three-dimensional ZnII frameworks containing malonates and various bipyridyl pillars (4,4′-bipyridine (1), 1,2-bis(4-pyridyl)ethane (2), 1,2-bis(4-pyridyl)ethylene (3) and 1,3-bis(4-pyridyl)propane (4)) have been prepared, and their structures were determined by X-ray crystallography. In a...

The present study was attempted to enhance the production of naphthoquinones and phenolics by Fusarium solani PSC-R of Palk Bay origin, which exhibited potent antibacterial, antioxidant and dyeing activity. Maximum productivity of naphthoquinones and phenolics was achieved in potato infusion med...

Cortex Juglandis Mandshuricae is used as a folk remedy for treating cancer, diarrhea and dysentery in traditional Chinese medicine for many years. Six flavonoids (myricitrin, quercitrin, taxifolin, myricetin, quercetin and naringenin), gallic acid and 5,8-dihydroxy-1,4-naphthoquinone are major b...

3,4-Dimethylbenzoic acid and 3,5-dimethylbenzoic acid were both oxidised by 4-methylbenzoate (p-toluate)-grown cells of Rhodococcus rhodochrous N75 via the ortho-pathway through the intermediates 3,4- and 3,5-dimethylcatechol, respectively. Owing to the formation of the two novel dead-end metabo...

Storage tests with C-A-S-H phases in Na2SO4 solutions (3 and 30 g/L SO4) were carried out to study changes in the C-A-S-H nanostructure during sulfate attack on concrete. Particular attention was paid to the availability of aluminium in C-A-S-H for ettringite formation. Ettringite only formed ab...

The objective of this study is to extract and characterize lignin from oil palm biomass (OPB) by dissolution in 1-butyl-3-methylimidazolium chloride ([bmim][Cl]), followed by the lignin extraction through the CO2 gas purging prior to addition of aluminum potassium sulfate dodecahydrate (AlK(SO4)...

The novel recovery process of potassium oxide and alumina from alunite concentrate was studied under different conditions, and the key technology of this process was the combination of high-temperature reductive calcination and low-temperature Bayer process. Results showed that high-temperature ...

Valuable metal extraction technology from thermal power plant fly ash is limited. In the present study, aluminium is extracted from fly ash as highly pure aluminium sulphate (>99.0%) by leaching with sulphuric acid, followed by pre-concentration and successive crystallization. Two types of fly a...

The leaching efficiency (LE) of ion adsorption rare earth (IARE) by the sulfate and chloride of ammonium, magnesium and aluminum were comparatively determined using column leaching method. It is found that at equal equivalent concentration of cation, the LE of IARE by aluminum sulfate is the hig...

Water-soluble trace constituents affect the physicochemical properties of polar ice. Their structural distribution provides important insights into the formation history of ice and inclusions. We report the first finding of KAl(SO4)2·12H2O (potassium alum) and Al2(SO4)3·nH2O (aluminum sulfate)...

IntroductionAlthough various surgical techniques have been described for the treatment of rectocele, there is currently no method exhibiting overall superiority because of the different types of complications and varying rate of recurrence. The aim of this study was to evaluate the outcomes of i...

This article presents an original study on the feasibility of reuse fly ash (FA) solidified/stabilized stainless steel pickling residue (SSPR). SSPR was characterized using different leaching procedure and solidified/stabilized using aluminum potassium sulfate dodecahydrate (KAl(SO4)2.12H2O) ame...

Single crystal of potassium aluminum sulfate dodecahydrate (potash alum) was grown by the slow evaporation technique of supersaturated aqueous solution at room temperature. The obtained crystal was characterized by using powder X-ray diffraction, DSC, TGA, electrical conductivity, optical transm...

Based on the inhibition effect on the respiratory chain activity of microorganisms by toxicants, an electrochemical method has been developed to measure the current variation of a mediator in the presence of microorganisms contacted with a toxicant. Microelectrode arrays were adopted in this stu...

The transport of electrons across biological membranes is believed to play an important role in many biophenomena. Although there have been many examples of systems which may be transporting electrons across Mueller-Rudin bilayer lipid membranes (blm), none has been well characterized. The syste...

The dissolution anisotropy of well-formed crystals of NiSO4 α oH2O grown under controlled conditions was studied using a single crystal dissolution method. Dissolution rates, proportional to an observed apparent rate constant, Kobs, were determined by measuring the movement of the (111) and (11...

Electro-electrodialysis (EED) is a promising technology for economic recovery of chromic acid in plating shops. It could potentially achieve chromic acid recovery, removal of metallic impurities and purification of static rinses in one step. There are however, process limitations. These are main...