Artificial sweeteners are food additives whose use has been controlled by European Parliament guidelines. The method described in this application note, shows how LC-MS/MS can be used to simultaneously detect and confirm the presence of several artificial sweeteners. The method is both quicker than conventional non LC-MS/MS methods and more sensitive. This has meant that these compounds can be ...

hydrogen is seen as one of the important energy carriers of the future with potential to reduce local as well as global warming. the main by-product of the combustion of hydrogen in air is water vapor and trace quantities of oxides of nitrogen. an experiment was conducted to study the impact of hydrogen/natural gas blends on performance, thermodynamic efficiency and exhaust gas emissions in a r...

objective: despite the strong relationship between sugars, mutans streptococcilevels and caries, relatively, little research has been carried out on one of the factors that may influ-ence sugar intake; namely sweet preference. the objective of the present study was to ex-plore the association between sweet preference and the levels of dental caries in 6-12 year-old schoolchildren in hamedan. ma...

pyknodysostosis is a rare bone disease that has autosomal dominant trait. it is characterized by short stature, diffuse osteosclerosis, acro-osteolysis, finger, and nail abnormalities. other features include open fontanelles and sutures, relative proptosis and obtuse mandibular gonial angle with relative mandibular prognathism. intraoral features such as dental abnormalities also have been repo...

a value chain is a series of events that takes a raw material and with each step adds value to it. global interest in the application of natural gas (ng) in production and transportation has grown dramatically, representing a long-term, low-cost, domestic, and secure alternative to petroleum-based fuels. many technological solutions are currently considered on the market or in development, whic...

the preparation of air–fuel mixture is considerably dependent on fluid flow dynamics to achieve improved performance, efficiency, and engine combustion in the appearance of flow. in this study, the effects of mixtures of hydrogen and compressed natural gas (cng) on a spark ignition engine are numerically considered. this article presents the results of a direct-injection engine using methane–hy...

rigorous mathematical modeling of adsorption processes in packed beds involves time-consuming computations which are considered as the fundamental weakness of such thorough mathematical models. thus, reducing the computation time was a key factor in improving adsorption mathematical models. in order to achieve this goal, an attempt was made to know how much using different numerical methods inf...