objective: the aim of the present study was to evaluate the efficacy of two caries detector dyes in the diagnosis of dental caries. materials and methods: twenty extracted human posterior teeth without pulpal exposure were sectioned mesiodistally through the center of the lesions using a water-cooled disk. the tooth halves were randomly divided into two groups and treated with caries detector (...

A dry starch–oil composite was blended with each of three glycols; ethylene, polyethylene, and propylene, and then reacted with isocyanate to produce polyurethane foams. The liquid glycols permitted the dry composite to blend well with the other ingredients in the foam formulations. Infrared spectra confirmed the presence of urethane structures in the composite–glycol foams. Polyethylene glycol...

Key words: aircraft de-icing fluid (ADF), phytoremediation, tolyltriazole, propylene glycol, ethylene glycol Aircraft de-icer fluids (ADFs) and antifreeze solutions are mainly formulations of either propylene or ethylene glycol and additives such as benzotriazole methyl substitution isomers (tolyltriazoles), and surfac-tants. Although the formulations are proprietary, in general the glycols are...

A high-performance liquid chromatography/mass spectrometry (HPLC/MS) method is developed for trace determination of glycols (ethylene glycol, 1,2- and 1,3-propylene glycols, and 2,3-butylene glycol) in water after derivatization with benzoyl chloride. Benzoyl esters of glycols are separated by microcolumn reversed-phase HPLC. Sensitivity and linearity of UV detection at 237 nm is compared with ...

Despite numerous works devoted to the cellulose hydrogenolysis process, only some of them describe reaction kinetics. This is explained by complexity process and simultaneous behavior different reactions. In this work, we present results kinetic study glucose into ethylene- propylene glycols in presence Ru@Fe3O4/HPS catalyst as a part catalytic conversion glycols. The structure Ru-containing ma...

A rapid headspace-gas chromatography (HS-GC) method was developed for the analysis of ethylene glycol and propylene glycol in plasma and serum specimens using 1,3-propanediol as the internal standard. The method employed a single-step derivitization using phenylboronic acid, was linear to 200 mg/dL and had a lower limit of quantitation of 1 mg/dL suitable for clinical analyses. The analytical m...

Environmental chamber experiments were carried out to assess the atmospheric ozone and particle matter (PM) impacts of selected representative VOCs emitted from architectural coatings. The UCR EPA environmental chamber was employed for the ozone and PM impact experiments, and most consisted of incremental reactivity experiments carried out at NO x levels of 25-30 ppb and at ambient surrogate RO...

The adsorption of polyalkylene glycols and co-polymers of ethylene oxide and propylene oxide on substrates relevant to textiles with varying surface energies (cellulose, polypropylene, nylon and polyester) was studied by using quartz crystal microgravimetry. Langmuirian-type isotherms were observed for the adsorption profiles of nonionic block polymers of different architectures. The affinity w...

Determination of toxic glycols and alcohols in an emergency setting requires a rapid yet accurate and reliable method. To simultaneously determine diethylene glycol (DEG) along with ethylene glycol, methanol, isopropanol, acetone, and ethanol, we modified a previously developed gas chromatographic (GC) method. The system used a Hewlett-Packard 6890 GC with EPC, a Gooseneck splitless liner, and ...