Leaf waxes (i.e., n-alkyl lipids or n-alkanes) are land-plant biomarkers widely used to reconstruct changes in climate and the carbon isotopic composition of the atmosphere. There is little information available, however, on how the production of leaf waxes by different kinds of plants might influence the abundance and isotopic composition of n-alkanes in sedimentary archives. This lack of info...

We describe the use of carbon stable isotope ((13)C) labeled n-alkanes as a potential internal tracer to assess passage kinetics of ingested nutrients in ruminants. Plant cuticular n-alkanes originating from intrinsically (13)C labeled ryegrass plants were pulse dosed intraruminally in four rumen-cannulated lactating dairy cows receiving four contrasting ryegrass silage treatments that differed...

Abstract Biochar is widely used as a soil amendment to improve properties and tool absorb net carbon from the atmosphere. In this study we determined signatures of organic molecular markers in following incorporation 5 10 t/ha biochar Fluvisol, cultivated with maize at experimental field ISSAPP “N. Poushkarov” institute Bulgaria. The n- alkane distribution treated soils was uni- or bimodal maxi...

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...

In order to reveal the nature of Ultraviolet aging(UV-aging) behavior asphalt molecules, dynamic microstructure during ultraviolet aging was simulated by Materials Studio software. The effect UV on transformation, aggregation and motion state is analyzed changes in energy, microstructural morphological variation, glass transition temperature viscosity molecular system. results show that Satruat...

Acinetobacter oleivorans DR1 can utilize C12 -C30 alkanes as a sole carbon source but not short-chain alkanes (C6 , C10 ). Two copies of each alkB-, almA- and ladA-type alkane hydroxylase (AH) are present in the genome of DR1 cells. Expression and mutational analyses of AHs showed that alkB1 and alkB2 are the major AH-encoding genes under C12 -C30 , and the roles of other almA- and ladA genes a...

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...

[1] Long-chain, odd-carbon-numbered C25 to C35 n-alkanes are characteristic components of epicuticular waxes produced by terrestrial higher plants. They are delivered to aquatic systems via eolian and fluvial transport and are preserved in underlying sediments. The isotopic compositions of these products can serve as records of past vegetation. We have developed a rapid method for stable carbon...

We studied the effect of segmented solvent molecules on the free energy of transfer of small molecules from water into alkanes (hexane, heptane, octane, decane, dodecane, tetradecane, and hexadecane). For these alkanes we measured partition coefficients of benzene, 3-methylindole (3MI), 2,3,4,6-tetrachlorophenol (TeCP), and 2,4,6-tribromophenol (TriBP) at 3, 11, 20, 33 [corrected], and 47 degre...