Surfactants such as quaternary ammonium salts (QAS) have been in increasing demand, for emerging new applications. Recent attempts at process intensification of their production disclosed the need a better understanding QAS thermal stability. This work aims to determine degradation kinetics various QASs and associated solvent effects. The four methyl carbonate were determined polar solvents sta...

Vapor-phase synthesis techniques of polymeric nanostructures offer unique advantages over conventional, solution-based techniques because of their solventless nature. In this work, we report the fabrication of coaxial polymer nanotubes using two different chemical vapor deposition methods. The fabrication process involves the deposition of an outer layer of the conductive polyaniline (PANI) by ...

In recent years, intensive studies have been carried out regarding the sensory activity of the individual components of the odours of various alcoholic beverages and the dependence between the odour and the chemical composition of the volatile fraction of these products, using gas chromatography with olfactometric detection (GC–O). GC–O is a technique based on sensory evaluation of the eluate f...

Multiple pesticides in water samples were successfully analyzed using an Agilent 5975T LTM GC/MSD equipped with an Agilent J&W DB-5ms Ultra Inert low thermal mass column module, with stir bar sorptive extraction and an Agilent Thermal Separation Probe for sample preparation. The method was simple, rapid, effective, and showed good linearity (R2 >0.9914) and high sensitivity for most of the targ...

The biodegradability and biocompatibility properties of ε-caprolactone homopolymers place it as a valuable raw material, particularly for controlled drug delivery and tissue engineering applications. However, the usefulness of such materials is limited by their low hydrophilicity and slow biodegradation rate. In order to improve polycaprolactone properties and functionalities, copolymerization ...

Novel segmented thermoplastic polyurethane (TPU) copolymers were synthesized using two-step solventless bulk polymerization. 4,4’-methylenediphenyl diisocyanate (MDI) and 1,4-Butanediol (BDO) were used to form hard segment of TPU and α,ω-dihydroxy-[poly(propyleneoxide)-poly (dimethylsiloxane)-poly(propyleneoxide)] (α,ω-dihydroxy-(PPO-PDMS-PPO)) was used to form soft segment of TPU, where the mo...

On an international scale, the last seventy-five years have been a period of deep social, economic and political transformation for the developing countries. They have been especially influenced by the international phenomenon of globalization, the benefits of which have been unequally distributed among countries. In this context, the strategies used to improve the general nutritional health of...

A group of NIEHS scientists has recently perfected a new in vivo gene modification technique that enables scientists to quickly generate site-directed mutations onto specific regions of the yeast genome. The researchers were able to create genetic mutations by inserting foreign DNA into host DNA without leaving a trace of the foreign DNA. Dubbed "Delitto Perfetto," Italian for "perfect murder,"...

A great deal of ink has been expended evaluating the constitutional implications of congressional regulations concerning human cloning.1 In contrast, there has been little discussion in the legal literature regarding the possibility of a federal law regulating human genetic modification.2 Perhaps, the paucity of analysis reflects the fact that human genetic modification, by which I mean genetic...