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.
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Showing 1 to 20 of 105 for “"Acetaldehyde"”.
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Acid-base catalysts for polycondensation of acetaldehyde in flow
Acetaldehyde is used as a bio-oil model compound in a polycondensation reaction over two acid-base catalysts, pelletized Evonik P25 TiO₂ and an activated hydrotalcite-like compound (HTlc), to produce high molecular weight molecules in the transportation fuel range. The catalytic performance of …
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The kinetics of the chromic acid oxidation of acetaldehyde
The kinetics for the reaction of the oxidation of acetaldehyde by chromic acid in aqueous medium has been studied in an attempt to extend the present knowledge of oxidation by chromic acid. In particular, these experiments were undertaken in order to see if there are any similarities between this …
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Acetaldehyde and Epithelial Junctions: Role of Pp2A and Occludin Phosphorylation
… are the subject of current study.</p> <p>Acetaldehyde, produced as a result of ethanol breakdown by intestinal microflora as well as intestinal epithelia, is a known carcinogen. It compromises the barrier function of intestinal epithelial cells by causing irregularities in the …
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Microbial Degradation of Acetaldehyde in Freshwater, Estuarine and Marine Environments
The oxygenated volatile organic compound, acetaldehyde, plays a fundamental role in atmospheric chemistry by altering the atmosphere’s oxidative status or “self-cleaning capacity”. Acetaldehyde flux from freshwater, estuarine, and marine environments is thought to be under significant microbial …
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Biochemical Studies of Aromatic Amino Acid Decarboxylases and Acetaldehyde Synthases
… Cα position, including decarboxylase and acetaldehyde synthase. L-3, 4-dihydroxyphenylalanine (L-dopa) decarboxylase (DDC) is a model enzyme we use as a reference because the structures and functions of DDC are relatively well established. We previously identified two annotated DDC-like …
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Gene expression profile of ethanol-stressed yeast in the presence of acetaldehyde
… quickly to ethanol stress in the presence of low acetaldehyde concentrations; however, the biochemical processes underpinning this effect are unknown. The objective of this project was to identify the mechanisms associated with the acetaldehyde-mediated adaptation of yeast to ethanol stress, which …
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Evolution of Nitrogen Compounds From Soybean (Acetaldehyde Oxime, Nitrous Oxide, N-15)
Soybean seedlings {Glycine max (L.) Merr. cv. Williams, 24 days after planting, grown on nutrient solution containing 15 mM NO(,3)('-)} evolved substantial amounts of N compounds in an open gas exchange system. Air exiting the shoot compartment was passed through a chemical trapping system. Traps …
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Adsorption of acetaldehyde vapour in low concentration in air with fixed-beds of charcoal
Digitized by Kansas Correctional Industries
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The effect of structure on the mass transport of acetaldehyde in virgin and recycled poly(ethylene terephthalate)
… aim was to investigate the specific migration of acetaldehyde from recycled PET into food simulants.
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Thermochemistry and kinetic analysis on radicals of acetaldehyde + O2, allyl radical + O2 and diethyl and chlorodiethyl sulfides
… transition states important in the radicals of acetaldehyde + O_2 and allyl radical + O_2 reaction systems are analyzed with density functional and ab initic calculations, to evaluate the reaction paths and kinetics in oxidation and pyrolysis. Ketene is one important product resulting from …
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The Effect of Ethanol and Acetaldehyde on Formation and Repair of Carcinogen-Dna Adducts in the Mammary Gland
In conclusion, both ethanol and acetaldehyde are capable of enhancing carcinogen-DNA adduct formation and inhibiting removal. However, these effects are dependent on the concentrations of ethanol or acetaldehyde, the time of exposure and the dose of carcinogen. Additionally, these effects, …
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Understanding the active sites of Mg-Al oxide catalysts in the formation of aromatic platform chemicals from acetaldehyde
The aromatization of acetaldehyde derived from bio-based feedstocks offers a sustainable route to obtaining valuable BTX (benzene, toluene, and xylenes)-like platform chemicals traditionally produced from petroleum naphtha. The acid-base properties of the catalyst must be carefully designed in …
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Effect of shelf-life and light exposure on acetaldehyde concentration in milk packaged in HDPE and PETE bottles
… but has the disadvantage of releasing odorous acetaldehyde into food matrices. Sensory detection group thresholds for acetaldehyde in whole, low fat and nonfat unflavored milks were 3939, 4020, and 4040 ppb respectively with no significant difference due to fat level. Chocolate flavored milk …
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Sensory and Chemical Characteristics of Soymilk Yogurt With Different Yogurt Cultures
Analyses showed that acetaldehyde and diacetyl were predominant volatiles in soy yogurts. Acetone, ethanol, 2-heptanone, and methanol were also found. The amounts of hexanal found in yogurt samples were lower than the threshold values and did not contribute to distinctive beany flavor in soy …
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