Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 178 for “"Alkane"”.
-
Engineering Alkane-Inducible Fimbriation in Escherichia Coli
… cells into hydrocarbon sources across a range of alkanes. Lastly, the presence of fimbriae was shown to be essential in the development of biofilms, where only strains expressing fimbriae resulted in biofilm formation.
-
Surface Freezing in Surfactant/Alkane/Water Systems
… investigated ellipsometrically with a range of n-alkanes (Cm where m = 12 – 20, 28). Two distinct solid phases are observed depending upon the chain length difference between surfactant and n-alkane. Type I solid phases consist of a surface frozen mixed monolayer and are formed when this …
-
Measurement of molecular diffusivities of liquid alkane systems
… <p>Diffusivities of a number of n-alkane-n-alkane and n-alkane-n-alcohol systems were measured at temperatures of 20⁰, 25⁰, 30⁰ and 40⁰C. A carbon-14 tracer technique was used in conjunction with the frit method. In most cases diffusivities were determined as the average of …
-
Trägereinfluss bei Vanadiumoxid-Katalysatoren zur selektiven Oxidation kurzkettiger Alkane
In dieser Arbeit wurde die oxidative Dehydrierung (ODH) von Propan zu Propen an einem Modellkatalysatorsystem untersucht. Die Katalysatoren bestanden aus Vanadiumoxiden, die auf einem geordneten mesoporösen Silica-Material (SBA-15) als hochdisperse Vanadiumoxide aufgebracht wurden. Um den Einfluss …
-
Osmium alkane complexes: Synthesis, characterization, and isotopic labeling studies
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
-
Pentamethylcyclopentadienyl Osmium Chemistry: An Approach to Transition Metal Alkane Complexes
Protonation of $\rm(C\sb5Me\sb5)Os(PMe\sb3)\sb2Me$ with $\rm HBF\sb4{\cdot}Et\sb2O$ at room temperature affords the Os$\sp{\rm IV}$ alkyl hydride complex $\lbrack\rm(C\sb5Me\sb5)Os(PMe\sb3)\sb2Me(H)\rbrack\lbrack BF\sb4\rbrack.$ Protonation of $\rm(C\sb5Me\sb5)Os(dmpm)Me$ at ${-}120\sp\circ$C with …
-
Molecular simulation of crystal growth in alkane and polyethylene melts
… using potentials that are well-parameterized for alkanes and polyethylene. In experiment and modeling of the kinetics of alkane crystallization, focus has been concentrated on growth rates very near the melting temperature, where the growth of these systems is optically observable. In this …
-
Structure Sensitivity of Alkane Hydrogenolysis on Ir/MgAl₂O₄ Catalysts
… it is proposed that the reaction mechanism of alkanes hydrogenolysis on the single atom catalysts including single active sites is probably distinctive from that generally accepted on the large particles containing multiple active sites from literature. For n-butane hydrogenolysis, the parallel …
-
Alkane Elimination Reactions between Transition Metal Hydrides and Rare-Earth Alkyls
… previous results of the Kempe group in which the alkane elimination reaction of [Cp*RuH2]2 with [Cp2Y(CH2SiMe3)(thf)] yielded [H(Cp*Ru)2H2YCp2], it was assumed that the reaction of the formal dihydride [Cp*RuH2]2 with two equivalents of a rare-earth bis(alkyl) should lead to products with …
-
Autophagic degradation of peroxisomes in the alkane-assimilating yeast Yarrowia lipolytica
The thesis is aimed at understanding of molecular mechanisms of autophagic degradation of peroxisomes (pexophagy) in the yeast Yarrowia lipolytica. This microorganism has been extensively used to explore peroxisome biogenesis (Titorenko and Rachubinski, 2000). Gunkel et al. (1999) intoduced Y. …
-
Functional characterisation of alkane-degrading monooxygenases in Rhodococcus jostii strain 8
Short-chain alkanes are gaseous hydrocarbons that contribute to photochemical pollution and ozone production in the atmosphere. A number of studies have shown that Rhodococcus species possess the ability to metabolite a wide range of hydrocarbons since they contain multiple hydrocarbon-degrading …
-
Precipitation, Aggregation, and Settling of Asphaltenes from n-Alkane Diluted Bitumens
… and fractal dimension reached a maximum at an n-alkane content of approximately 75 wt%. Settling rates are a function of the aggregate size and fractal dimension and reached a maximum at approximately the same n-alkane content. The settling rates were modeled with Stokes’ law modified to include …
-
Isolation and characterization of n-alkane utilizing bacteria, which produce biomulsifiers
Bacterial strains were isolated by enrichment cultures from oil-contaminated soil samples. In the present study, several strains, capable of growing on crude oil, were isolated. Isolates were screened for their inherent abilities to produce bioemulsifiers when they were grown on hydrocarbon …
-
Molecular simulation study of homogeneous crystal nucleation in n-alkane melts
… homogeneous crystal nucleation in the melts of n-alkanes, the simplest class of chain molecules. Three n-alkanes with progressive chain length were studied, n-octane (C8), n-eicosane (C20), and C150, using a united atom force field, which is able to reproduce physical quantities related to the …
-
Elementary processes in alkane-based reactive ion etching of III-V semiconductors
… microelectronics industry. Recently, the use of alkane-based plasmas has been developed for the etching of compound semiconductors. However, due to the complex nature of the plasma environment, relatively little is known about the etching mechanisms involved. To gain some understanding of the …
-
Proteomic insights into the marine obligate hydrocarbonoclastic bacteria (OHCB) during alkane degradation
… To understand the enzymes involved in alkane degradation in three key OHCB (Thalassolituus oleivorans MIL-1, Alcanivorax borkumensis SK2, and Oleispira antarctica RB-8), LC-MS/MS shotgun proteomics was performed on cells growing on different hydrocarbons. T. oleivorans grew equally well …
-
Towards a coupled δ18O sugar and δ2H n-alkane approach in paleoclimate research
… presented, namely a coupled δ18O sugar and δ2H n-alkane biomarker approach. Sugar biomarkers were extracted hydrolytically from plant and soil samples and measured for δ18O using gas chromatography-pyrolysis-isotope ratio mass spectrometry (GC-Py-IRMS). Prior to coupling of the δ18O sugar and δ2H …
-
Phase Behaviour of Alkane Solvent(s)-CO2- Water-Heavy Oil Systems at High Pressures and Elevated Temperatures
… importance to quantify the phase behaviour of alkane solvent(s)–CO2–water–heavy oil systems at high pressures and elevated temperatures. A new alpha function in the Peng–Robinson equation of state (PR EOS) has been developed for water component to improve its prediction for water vapour …
-
Nonequilibrium phase Behaviour and Mass Transfer of Alkane Solvents(s)-CO2-Heavy Oil Systems Under Reservoir Conditions
… dissolution with injected gases (e.g., CO2 and alkane solvents), which is characterized by time-dependent (i.e., nonequilibrium) phase behaviour. The entrained gas bubbles in the heavy oil are considered as the main mechanism accounting for such distinct phase behaviour. Therefore, it is of …
Page 1 of 9