AIM Indirect restorations are increasingly used in dentistry, and the cementation interface is possibly the most critical region of the work. The objective of the present work was to evaluate the influence of exposure to a culture medium containing S. mutans on the hardness and solubility of four different cementing agents (zinc phosphate, glass ionomer, glass ionomer modified with resin and re...

For the first time, a simple on-line continuous leaching method, where artificial gastrointestinal fluids are sequentially pumped through a mini-column of food while As is continuously monitored by inductively coupled plasma mass spectrometry (ICP-MS), is used to assess the bio-accessibility of As in Arabic area rice. This on-line leaching method offers several advantages over batch methods; mo...

This study aimed to identify the metal flow in a municipal solid waste (MSW) management system. Outputs of a resource recovery facility, refuse derived fuel (RDF) production facility, carbonization facility, plastics liquefaction facility, composting facility, and bio-gasification facility were analyzed for metal content and leaching concentration. In terms of metal content, bulky and incombust...

Hydrogels allow control of gel composition and mechanics, and permit incorporation of cells and a wide variety of molecules from nanoparticles to micromolecules. Peptide-linked hydrogels should tune the basic polymer into a more bioactive template to influence cellular activities. In this study, we first introduced the generation of 2D poly-(sulfobetaine methacrylate [SBMA]) hydrogel surfaces. ...

stabilization/ solidification (s/s) of hazardous waste by hydraulic binders is one of the mostpromising ways to reduce the polluting nature of ultimate waste. this study conducted at the laboratory scale, to study of the influence of various parameters namely: the ratio l/s, the contact time solid/liquid, surface and medium of exposure...etc., on the environmental impact of ultimate waste synth...

Disposal of discarded chromated copper arsenate (CCA)-treated wood in landfills raises concerns with respect to leaching of preservative compounds. When unweathered CCA-treated wood is leached using the toxicity characteristic leaching procedure (TCLP), arsenic concentrations exceed the toxicity characteristic (TC) limit of 5mg/L in most cases. The majority of discarded CCA-treated wood, howeve...

This study aims at finding out if multiple attenuated internal reflection-infrared (MAIR-IR) spectroscopic analysis can be used as a tool to differentiate commercial resin composite brands and to find out if different resin composites will have different abilities of leaching materials that are cytotoxic to human gingival fibroblasts (HGFs) Tooth-colored resin fillings have become increasingly ...

Rigid-wall column tests are performed at a hydraulic gradient of 100 on 21 compacted mixture contai.ning a Class F fly ash, sand, benton.ite, and cement. Results indicate that combina1ions of the admixtures can lower the permeability of the fly ash by up to an order of magnitude. There appears to be an optimum percentage of fly ash that minimizes the permeability of fly ashsand mixtures. Specim...

A new generation of VISIV polyolefin intravenous solution containers, made of a new and different proprietary polymer, were evaluated for sorption and leaching potential with a cadre of drugs known to exhibit those phenomena with polyvinylchloride containers. Sorption potential was evaluated for amiodarone hydrochloride, carmustine, regular human insulin, lorazepam, nitroglycerin, sufentanil ci...

Heck reactions were performed with 4-bromoacetophenone and n-butyl acrylate, yielding the trans-arylated acrylate ester with high selectivity. Pd–zeolite catalysts were compared with supported Pd metal catalysts. In order to obtain an active and heterogeneous catalyst, the preformed or in situ-formed catalytically active Pd0 species and the PdII intermediates must be sufficiently stabilized on ...