AIMS To assess the potential bactericidal activity of amine oxide (C10-C16-alkyldimethyl N-oxides) against Streptococcus mutans grown as planktonic suspension and as biofilm on hydroxyapatite discs, and its ability to control acidification of the media. METHODS Amine oxide bacteriostasis was investigated using the Bioscreen C Microbiological Growth Analyser, while a standard suspension test w...

The Pope and Stevens method (1) for quantitative determination of amino acids and peptides is based on iodometric analysis of the combined copper, a procedure that is somewhat inconvenient. Woiwood (a), using the color produced by diethyldithiocarbamate, has described a spectrophotometric modification of the Pope and Stevens method. Martin and Mittelmann (3) have used polarographic analysis of ...

A preliminary survey of an arsenic contaminated site from an abandoned copper smelting facility and feasibility study of using solidification/stabilization (S/S) process to treat the contaminant waste were undertaken. It was found that the waste, located in the three-flue gas discharge tunnels, contained 2-40% arsenic. The pH of the contaminated waste is extremely low (ranging from 1.8 to 3.6)....

Galactose oxidase from Fusarium graminearum IMV-1060 adsorbed on, and covalently bound to, silica carriers has been used for analytical determinations of D-galactose and galactose-containing sugars. Using a flowing oxygen electrode of the Clark-type, sensor system for enzymatic analysis of water solutions of galactose-containing carbohydrates was made. Measurements were taken both in the pulse ...

Understanding the generation and behaviour of air bubbles in the presence of different reagents is important in the solid/liquid separation processes used to treat mineral and water and wastewater by flocculation–flotation. The presence of large air bubbles in aerated flocs, which have higher up-rising rates, can lead to the development of higher capacity units. The present work evaluated the g...

Integrated CO2 capture and hydrogenation to produce formate offers a sustainable approach for reducing carbon dioxide emissions producing liquid hydrogen carriers (formate) simultaneously. In the current study, three different types of aqueous amine solutions including monoethanolamine (MEA), diethanolamine (DEA) triethanolamine (TEA) were investigated as CO2-capturing agents in presence Pd/NAC...

p-N,N-dimethyl phenylene diamine(DMPD) is oxidized with Iodine into p-N,N-dimehylbenzoquinonemonoimine which can form a purple –red charge –transfer complex with aromatic primary amine (APA) at pH 3.0 . The absorbance of the p-N,Ndimehylbenzoquinonemonoimine – APA charge-transfer complex is measured at 520nm. This proposed method is simple, rapid and sensitive with reasonable precision and accu...