In the present study, the microbial community and functional gene composition of a long-term active alkane-degrading methanogenic culture was established after two successive enrichment culture transfers and incubated for a total period of 1750 days. Molecular analysis was conducted after the second transfer (incubated for 750 days) for both the active alkanes-degrading methanogenic enrichment ...

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...

A method using thermal desorption sampling and analysis by proton transfer reaction mass spectrometry (PTRMS) to measure long chain alkanes (C12–C18) and other larger organics associated with diesel engine exhaust emissions is described. Long chain alkanes undergo dissociative proton transfer reactions forming a series of fragment ions with formula CnH2n+1. The PTR-MS is insensitive to nalkanes...

Synchrotron x-ray reflectivity is used to study the interface between bulk water and bulk n-alkanes with carbon numbers 6 through 10, 12, 16, and 22. For all interfaces, except the water-hexane interface, the interfacial width disagrees with the prediction from capillary-wave theory. The variation of interfacial width with carbon number can be described by combining the capillary-wave predictio...

Statistical mechanics and transition state (TS) theory describe rates and selectivities of C-C bond cleavage in C2-C10 n-alkanes on metal catalysts and provide a general description for the hydrogenolysis of hydrocarbons. Mechanistic interpretation shows the dominant role of entropy, over enthalpy, in determining the location and rate of C-C bond cleavage. Ir, Rh, and Pt clusters cleave C-C bon...

A P450 monooxygenase from Nocardia farcinica (CYP154A8) catalyses the stereo- and regioselective hydroxylation of n-alkanes, still a challenging task in chemical catalysis. In a biphasic reaction system, the regioselectivity for the C2-position of C7-C9 alkanes was over 90%. The enzyme showed strict S-selectivity for all tested substrates, with enantiomeric excess (ee) of up to 91%.

The relationship between energy calculations and boiling points was studied on a set of fourteen n-alkanes. The correlation analysis clearly showed that the best relationship is not linear. The regression analysis showed that a dose-response logistic function provided a very good agreement between the boiling points of alkanes and their heat of formation.

RhC1(CO)(PMe3)2 under irradiation is a powerful catalyst which can functionalize hydrocarbons including alkanes under mild conditions. The reaction with carbon monoxide leads to the formation of the corresponding aldehyde. Alkanes react regioselectively at the terminal methyl group. The reaction of alkanes under inert atmosphere results in the formation of alkenes with a concomitant evolution o...

Though the lower n-alkanes are considered the most degradable components of crude oil, our experiments with microcosms simulating oiled beaches showed substantial depletion of fluorene, phenanthrene, dibenzothiophene, and other PAH in control treatments consisting of raw seawater cycled through the microcosms over a 30-day period. PAH was not detectable in pooled test system effluents. To resol...