Chain-folded lamellar crystalline complexes of amylose with aliphatic diols were prepared and characterized by transmission electron microscopy as well X-ray diffraction. Four allomorphs identified, depending on the complexing diol crystallization conditions, that consisted orthorhombic lattices antiparallel 6- or 7-fold single helices. Straight-chain n-diols (ethane-1,2-diol, butane-1,4-diol, ...

The self-diffusion coefficient of hydrogen (H(2)), carbon monoxide (CO) and water (H(2)O) in n-alkanes was studied by molecular dynamics simulation. Diffusion in a few pure n-alkanes (namely n-C(8), n-C(20), n-C(64) and n-C(96)) was examined. In addition, binary n-C(12)-n-C(96) mixtures with various compositions as well as more realistic five- and six-n-alkane component mixtures were simulated....

B. M. Ocko, 1 X. Z. Wu, 2,3 E. B. Sirota, 4 S. K. Sinha, 5 O. Gang, 6 and M. Deutsch 6 Physics Department, Brookhaven National Laboratory, Upton, New York 11973 Physics Department, Northern Illinois University, DeKalb, Illinois 60115 Material Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439 Exxon Research and Engineering Company, Route 22 East, Annandale, New Jersey 08801...

The Kishon River, the second largest coastal river in Israel, has been severely polluted for several decades. Sediments from upstream and downstream sites of the river were analyzed, lipid-extracted and evaluated for phenanthrene uptake. Total polycyclic aromatic hydrocarbon (PAH) concentration in downstream sediments was 299 microg kg(-1), consisting mostly of petrogenic-derived PAHs. Downstre...

The predictive local composition model is applied to multicomponent hydrocarbon systems with long-chain n-alkanes as solutes. The results show that it can successfully be extended to highorder systems and accurately predict the solid appearance temperature, also known as cloud point, in solutions of known composition using only binary information. The model can describe the experimentally well-...

Nocardia 107-332, a soil isolate, oxidizes short-chain alkyl-substituted cyclic hydrocarbons to cyclic acids while growing on n-alkanes. Cyclic acids are produced also from relatively long-chain alkyl-substituted cyclics such as n-nonylbenzene or n-dodecylbenzene which alone support growth in a mineral-salts medium. omega-Oxidation of the alkyl substituents is followed by beta-oxidation. It is ...

The chemical composition of the lipids in wheat straw was studied in detail by gas chromatography and mass spectrometry. Important discrepancies with the data reported in previous papers were found. The predominant lipids identified were series of long-chain free fatty acids (25% of total extract), followed by series of free fatty alcohols (ca. 20%). High molecular weight esters of long chain f...

Abstract Long-chain alkenones and n -alkanes preserved in marine lake sediment cores are widely used to reconstruct palaeoenvironments. However, applying this technique exposed sedimentary rock sequences is relatively challenging due the potential for diagenetic alteration of organic biomarkers. Here, we extract long-chain from an outcrop Kazusa Group central Japan, one most continuous successi...

Soil bacterial population dynamics were examined in several crude-oil-contaminated soils to identify those organisms associated with alkane degradation and to assess patterns in microbial response across disparate soils. Seven soil types obtained from six geographically distinct areas of the United States (Arizona, Oregon, Indiana, Virginia, Oklahoma, and Montana) were used in controlled contam...

The heats of adsorption on magnesium oxide of six linear chain alkanes (C4 to C 9 ) , of the corresponding 1-mono-olefins and of the cycl ic compounds cyclohexane, cyclohexene, 1.4-cyclohexadiene and benzene have been determined by gas-solid chromatography and extrapolated to zero surface coverage. The values obtained with n-alkanes are linearly dependent on the carbon atom number. By compariso...