Wax esters are major constituents of the surface lipids in many terrestrial arthropods, but their study is complicated by their diversity. We developed a procedure for quantifying isomers in mixtures of straight-chain saturated and unsaturated wax esters having the same molecular weights, using single-ion monitoring of the total ion current data from gas chromatography-mass spectrometry. We exa...

Long-term hydroclimate variability at low latitudes exerts a strong influence on global climate, yet its timing and mechanisms are poorly documented for the central Pacific region. Here we present molecular hydrogen isotopic compositions of long-chain n-alkanes in montane wetland deposit Mount Kaʻala Island Oʻahu, Hawaiʻi, which document hydrological conditions related vegetation changes over l...

Physiological and regulatory mechanisms that allow the alkane-oxidizing bacterium Pseudomonas butanovora to consume C2 to C8 alkane substrates via butane monooxygenase (BMO) were examined. Striking differences were observed in response to even- versus odd-chain-length alkanes. Propionate, the downstream product of propane oxidation and of the oxidation of other odd-chain-length alkanes followin...

The Scheldt River system is located in northern France, Belgium and the Netherlands and includes a dense network of rivers, which contributed to the urban and industrial development in this area. Three sediment cores, collected in the Upper Scheldt River (Helkijn) and two of its tributaries (the Lys River at Wervik and the Espierre Canal), were analysed for n-alkanes and polycyclic aromatic hyd...

Pelargonic acid is a by-product of the ozonolysis reaction oleic to azelic acid. decarboxylation process removing carboxyl group (-COO-) from pelargonic (C9H18O2) produce n-octane (C8H18) hydrocarbons, which are main hydrocarbons that make up gasoline. The parameter in gasoline octane number. number 15, considered low, while good desired have high To convert straight-chain alkanes and alkenes i...

This paper represents a fragment of systematic studies on positron annihilation in solid saturated hydrocarbons (alkanes, paraffins) from C17H36 to C30H62. The Tao–Eldrup model and its extensions allow to identify the places in the crystalline structure where positronium is trapped, and estimate respective trap sizes. In the rigid phase I positronium locates mainly in two-dimensional empty spac...

Basing on the DFT calculations we propose new theoretical model which describes both surface tension σ of short chain n-alkanes at their normal boiling points and reaction rate constants with hydroxyl radicals OH• (at 297 ± 2 K) basis molecular orbital electronic characteristics. It has been shown that intermolecular dispersion attraction within liquid monolayer these compounds, as well k are d...

Weathering processes change properties and composition of spilled oil, representing the main reason of failure of bioaugmentation strategies. Our purpose was to investigate the metabolic adaptation of hydrocarbon-degrading bacteria at harsh conditions to be considered to overcome the limitations of bioaugmentation strategies at harsh conditions. Polluted soils, exposed for prolonged periods to ...

Lipid analysis of aquatic plants from lakes on Mt. Kenya, E. Africa, revealed that non-emergent (submerged and ̄oating-leaved) species displayed enhanced abundances of mid-chain length, C23 and C25 n-alkanes. In contrast, the emergent aquatic plants had n-alkane distributions similar to those of the terrestrial vegetation, typically dominated by the long-chain length homologues (>C29). A proxy r...