--The hydrocarbon content of leaf fossils from Iceland has been investigated by gas chromatography-mass spectrometry. The distribution patterns of normal hydrocarbons, branched hydrocarbons, and cyclic hydrocarbons are compared to those of present-day living organisms. The diagenetic pathways of these hydrocarbons are discussed.

INTRODUCTION — Hydrocarbons are organic substances that contain carbon and hydrogen; they are liquid at room temperature [1] . All petroleum distillates (eg, kerosene, gasoline, mineral seal oils, and naphtha) are hydrocarbons; however, not all hydrocarbons are petroleum distillates. Hydrocarbons also often are mixed with agents that have systemic toxicity such as camphor, aniline dyes, heavy m...

poly aromatic hydrocarbons are hydrophobic organic compound found as major contaminants in soil. soil biological activities are vital for the restoration of soil contaminated with hydrocarbons. successful application of bioremediation technology to contaminated soil requires knowledge of the characteristics of the site and the parameters that affect the microbial biodegradation of pollutants. t...

Petroleum hydrocarbons are important energy resources used by industry and in our daily life, whose production contributes highly to environmental pollution. To control such risk, bioremediation constitutes an environmentally friendly alternative technology that has been established and applied. It constitutes the primary mechanism for the elimination of hydrocarbons from contaminated sites by ...

Adsorption and conversion of various hydrocarbons on monolithic hydrocarbon adsorbers were studied using a new experimental model, temperature-programmed adsorption (TPA). In this study, methyl alcohol, acetone, acetaldehyde, 2,2,4-trimethylpentane, n-octane, and toluene were chosen as model hydrocarbons for cold start of a vehicle. The effect of the hydrocarbon components and oxygen concentrat...

Important information regarding the reactions of carcinogenic and related hydrocarbons has been obtained chiefly from the following four previous lines of investigation : ( a ) The extensive study of methods of synthesis of carcinogenic hydrocarbons by the technics of the organic chemist (4). ( b ) The experimental study of the oxidative and coupling reactions of such hydrocarbons under conditi...

This study reports a general methodology for making stable high-performance photosensitive field effect transistors (FET) from self-assembled columns of polycyclic aromatic hydrocarbons by using single-walled carbon nanotubes (SWNTs) as point contacts. In particular, the molecules used in this work are liquid crystalline materials of tetra(dodecyloxy)hexabenzocoronenes (HBCs) that are able to s...

Determining gas compositions from live well fluids on a drilling rig is critical for real time formation evaluation. Development and utilization of reliable mass spectrometric method to accurately characterize these are always challenging due lack robust effectively selective instrument procedure. The methods currently utilized need better calibration the characterization light hydrocarbons (C1...