Fluorescence quenching of 22 polycyclic aromatic hydrocarbons by nitromethane in toluene and acetonitrile solutions has been studied. Contrary to Sawicki's observations that the fluorescence of hydrocarbons with the fluoranthene skeleton is not quenched that of 11J2and 3.4-benzofluoranthene and fluoranthene itself is quenched. These compounds have a high energy of the fluorescence transition. T...

Treatment of rats with phenobarbital, which stimulates the activity of the drug-metabolizing enzymes in the liver, potentiates hepatic necrosis elicited by bromobenzene and a number of other chemically inert halogenated aromatic hydrocarbons. Radioautographic studies indicate that [(14)C]bromobenzene is covalently bound at the sites of necrosis. From these results, it is inferred that the hepat...

A total of 10 surface soil samples representing the entire area of Linfen City were collected and analyzed for the presence of 16 polycyclic aromatic hydrocarbons. The total polycyclic aromatic hydrocarbon concentration ranged from 1.1 to 63.7 microg g(-1). Analysis of the sources of contamination revealed that polycyclic aromatic hydrocarbons in the soil were derived from combustion sources. S...

We present a short review of our current knowledge on Saturn’s stratospheric thermal structure and composition (hydrocarbons) based on recent Cassini/CIRS observations. Anomalies in the temperature field and in the meridional distribution of hydrocarbons hint at atmospheric dynamical phenomena at play. The two most notable features are an obseved asymmetry in the hydrocarbons distribution at hi...

Earlier phases of economic expansion and urban development have resulted in significant sources of urban soil contamination. Petroleum hydrocarbons are one of the most common groups of persistent organic contaminants in the environment. In this study, two types of treatment in 3 concentrations were prepared that were included plant treated by 1% oil pollution, treatment by 1% contamination with...

This report looks at Bolivia's main economic indicators over the past year (mid-2006 to mid-2007), noting improvements in growth, fiscal balances, balance of payments, and international reserves. These improvements were largely due to government policies and choices, such as increased hydrocarbons royalties and control over the hydrocarbons sector, and have allowed the government to embark on a...

objective(s):various species of genus trigonella are important from medical and culinary points of view. the essential oil of trigonella torbatejamensis ranjbar as an endemic plant in iran has not been studied previously. the essential oil of this plant was analyzed by different methods for identification of its components. materials and methods: the essential oil composition of aerial parts of...