A detailed literature search was performed to assess the sources, magnitudes and extent of human inhalation exposure to propylene. Exposure evaluations were performed at both the community and occupational levels for those living or working in different environments. The results revealed a multitude of pyrogenic, biogenic and anthropogenic emission sources. Pyrogenic sources, including biomass ...

BACKGROUND A shisha-pen is an electronic cigarette variant that is advertised to mimic the taste of a water pipe, or shisha. The aim of this study was to assess the potential harmful health effects caused by inhaling the vapor of a nicotine-free shisha-pen. METHODS Gas chromatography analysis was performed to determine the major components in shisha-pen vapor. Risk assessment was performed us...

The objective of this study was to determine the effect of a sustained propylene glycol administration to recipients of frozen/thawed in vivo derived bovine embryos. Heifers were treated with oral propylene glycol for the last 20 days before embryo transfer (n = 142), and untreated as controls (n = 133). Progesterone, insulin, insulin-like growth factor-I, glucose, urea and triglyceride were an...

A steady-state kinetic analysis of purified soluble methane mono-oxygenase of Methylococcus capsulatus (Bath) was performed. The enzyme was found to follow a concerted-substitution mechanism. Methane binds to the enzyme followed by NADH, which reacts to yield reduced enzyme and NAD+. The reduced enzyme-methane complex binds O2 to give a second ternary complex, which breaks down to release water...

The effect of i.v. propylene glycol in doses of 160-800 mg kg-1 on heart rate, arterial pressure and efferent sympathetic activity were observed in anaesthetized paralysed, artificially ventilated dogs. Within 3-5 s of the commencement of the injection of propylene glycol there was an immediate mean decrease in heart rate of 22.7 and 72.1 beat min-1 and in arterial pressure of 27.2 and 58.8 mm ...

A kinetic model for propane dehydrogenation in an industrial moving bed reactor is developed based on the reported reaction scheme. The kinetic parameters and activity constant are fine tuned with several sets of balanced plant data. Plant data at different operating conditions is applied to validate the model and the results show a good agreement between the model predictions and plant observa...

Tropical formulations of 5-trifluoromethyl-2'-deoxyuridine (TFT) containing different concentrations of TFT, Azone (Nelson Research and Development, Irvine, Calif.), and propylene glycol were evaluated for their potential efficacy in the treatment of cutaneous herpes simplex virus infections by in vitro studies of TFT penetration through skin and in vivo studies of therapeutic activity against ...

OBJECTIVES We evaluated the effect of naproxen sodium on propylene glycol-induced otitis media in guinea pig ears. MATERIALS AND METHODS Twenty adult guinea pigs were randomized to the study and control groups equal in number. A single dose of propylene glycol (0.2 ml, 60%) was applied to the left ears of the control group and to both ears of the study group. Saline solution was applied to th...