Environmental microbes utilize four degradation pathways for the oxidation of n-alkanes. Although the enzymes degrading n-alkanes in different microbes may vary, enzymes functioning in the first step in the aerobic degradation of alkanes all belong to the alkane hydroxylases. Alkane hydroxylases are a class of enzymes that insert oxygen atoms derived from molecular oxygen into different sites o...

Eight electronic properties; HUMO, LUMO, HOMO-LUMO energy gap, dipole moment point-charge, hybrid, molecular weight, heat of formation and zero-point 60 normal branched alkanes were examined using topology indices. All the properties calculated semi-empirical self-consistent orbital theory. The relationship calculation with seven models indices based on degree and/or distance obtained in terms ...

Hydrocarbon profiles on the cuticle of social insects act as multi-component recognition cues used to identify membership in a species, a colony or, within colonies, cues about its reproductive status or task group. To examine the role of structural complexity in ant hydrocarbon recognition cues, we studied the species recognition response of two ant species, Linepithema humile and Aphaenogaste...

Molecular geochemical methods have shown that it is often dicult to di€erentiate between coaland interbedded shale-sourced oils, even though coals and interbedded shales may exhibit considerable organic in ̄ux variation (e.g. land plant vs algal organic matter) due to the changes of depositional setting. However, compound-speci®c stable carbon isotopic compositions are sensitive to the source i...

The purpose of the present work is to show that light straight-run gasoline fraction can be used as feedstock for hydro-catalytic isomerization process, and isomerized product serve a component obtaining pure ecological commercial brand Euro-4 Euro-5. Transformation n-alkanes Zhanazhol oil’s with boiling temperature 180°C was studied. Isomerization carried out in flow unit stationary layer modi...

The growth of secondary organic aerosols (SOA) is a vital cause the outbreaks winter haze in North China. Intermediate volatile compounds (IVOCs) are important precursors SOA. Therefore, chemical characteristics, source, and SOA production IVOCs during episodes have attracted much attention. Hourly time resolution IVOC samples two collected Hebei Province China were analyzed this study. Results...