نتایج جستجو برای: alkanes of petroleum products
تعداد نتایج: 21178656 فیلتر نتایج به سال:
An ecotoxicological study were conducted to evaluate the concentrations of PAHs and n-alkanes, in gut, liver and kidney tissues of two individuals of Enhydrina schistose (Daudin, 1803), using gas chromatography/mass spectrometry. The concentrations of PAHs (0.10 µg/g) and n-alkanes (8.12 µg/g) were elevated in the gut, and liver (PAHs 0.05 µg/g tissue, n-alkanes 29.16 µg/g tissue). In kidney of...
the poor orientation of the restaurants toward the information technology has yet many unsolved issues in regards to the customers. one of these problems which lead the appeal list of later, and have a negative impact on the prestige of the restaurant is the case when the later does not respond on time to the customers’ needs, and which causes their dissatisfaction. this issue is really sensiti...
in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...
in the first chapter we study the necessary background of structure of commutators of operators and show what the commutator of two operators on a separable hilbert space looks like. in the second chapter we study basic property of jb and jb-algebras, jc and jc-algebras. the purpose of this chapter is to describe derivations of reversible jc-algebras in term of derivations of b (h) which are we...
The Kishon River, the second largest coastal river in Israel, has been severely polluted for several decades. Sediments from upstream and downstream sites of the river were analyzed, lipid-extracted and evaluated for phenanthrene uptake. Total polycyclic aromatic hydrocarbon (PAH) concentration in downstream sediments was 299 microg kg(-1), consisting mostly of petrogenic-derived PAHs. Downstre...
Production of fatty acid-derived biofuels and chemicals have garnered attention in recent years owing to their potential to replace petroleum and plant oil-derived products. Through the metabolic engineering of the fatty acid metabolism pathway, advanced fuels and chemicals such as free fatty acid, triacylglycerol, biodiesel, fatty alcohols, alkanes/alkene, R-3-hydroxybutyric acid, polyhydroxya...
Background and purpose: Petroleum hydrocarbons might have a natural origin, but human activity is the main source of these pollutants in the environment. This study was done to determine the origin of n-alkanes and PAHs in surface sediments of the southeastern coast of the Caspian Sea. Materials and methods: A total of 12 sediment samples from six stations in Noshahr and Amir Abad ports wer...
nowadays, the development of anti cancer drugs is an important subject in pharmacology. bisphosphonates (b.p) are a great choice for design and production of the types of drugs which not only could perform as anti cancer agents but also could inhibit the function of acetyl cholinesterase (ache). ache hydrolyzes the acetylcholine (which is a neurotransmitter in nervous system) using the oh in i...
Aldehyde deformylating oxygenase (ADO) is a unique enzyme found exclusively in photosynthetic cyanobacteria, which natively converts acyl aldehyde precursors into hydrocarbon products embedded in cellular lipid bilayers. This capacity has opened doors for potential biotechnological applications aiming at biological production of diesel-range alkanes and alkenes, which are compatible with the no...
C and dC values were measured for individual long-chain n-alkanes (C24ÿ33) from Santa Monica Basin sediments. The data were then simulated using a three-component mixing model designed to represent the contributions of dierent sources. The three selected end members were petroleum, modern plant wax, and shale-derived alkanes. The model was optimized to ®t the data and to determine the fraction...
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