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 90 for “"Scavengers"”.
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Novel mesoporous silicates as indoor air pollutant scavengers
A mesoporous silicate has been developed for the removal of volatile organic compounds (VOCs). The indoor air pollutants of interest were formaldehyde, toluene, ethylbenzene, o-xylene, cumene and dichlorobenzene. The indoor air pollutants were actively sampled onto (i) Tenax filled sampling tubes …
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No life without death: Scavengers enhance nutrient cycles via carcass decomposition
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Efficacy of Odor Scavengers in Reducing Odor Compounds in Water, Milk, and Soymilk
… but not for milk. The efficacy of the odor scavengers were determined by use of solid phase micro-extraction gas chromatography (SPME-GC) and sensory evaluation. Hexanal, 2-heptenal, 2-pentanone, and 2,4-nonadienal were spiked at 1,000, 3,000, 30,000, and 300 ppb respectively in all three …
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The application of immobilized reagents and scavengers to multi-step organic synthesis: a total synthesis of epothilone C.
… C that applied immobilized reagents and scavengers. Chapter five provides a formal report of the experimental procedures for chapter four.
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The reaction pathways of hydrogen peroxide in the presence of scavengers and its transition metal catalyzed oxidation of disulfide bridge containing peptides
The degradation pathway of hydrogen peroxide (H2O2) with sodium pyruvate elucidates the formation and breakdown of an intermediate formed during the reaction. Sodium pyruvate is a potential base for the creation of a peroxide scavenger. It readily reacts with H2O2 to yield sodium acetate, carbon …
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An Investigation of patterns of mammalian scavenging in relation to vertebrate skeletal remains in a Northwestern European context: forensic applications.
… within Northwestern Europe. These mammalian scavengers have dentitions and bite forces capable of heavily modifying and widely transporting human remains yet there are currently no species-typical and region-specific studies of these scavengers and their impacts on forensic investigations and …
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Development and use of a chemically defined medium for estimating the oxygen tolerance of campylobacter species
… could grow at 21 % O₂ without any additional scavengers of reactive oxygen intermediates (ROIs), although CO₂ was still required for growth. When the medium was prepared with other brands of tryptone, it did not allow growth of C. jejuni beyond 10% O₂. The dependence of the growth response on …
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Formaldehyde-MEA Triazine Based Hydrogen Sulfide Scavenger Behavior Study and Applications in the Oil and Gas Industry
… Triazine is one of the common H2S scavengers in use. The objective of this research was to review different chemistries and field applications applicable as H2S scavengers in oil and gas, understand the Formaldehyde-MEA Triazine’s properties and behaviors in the sweetening process, …
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Mechanistic Study of Pollutant Degradation
… can be enhanced by volatile hydrogen atom scavengers such as carbon tetrachloride and perfluorohexane. The non-volatile hydrogen atom scavenger iodate did not enhance phenol degradation. The first order rate constant for aqueous phenol degradation increased by about 2.2-2.8 times in the …
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EVALUATING RISK OF LEAD EXPOSURE IN SCAVENGING SPECIES LINKED TO BIG-GAME HUNTING IN SASKATCHEWAN, CANADA
… (rifle-harvested remains) and the consumers (scavengers). The objective of my research was to evaluate the risk of lead exposure to scavenging wildlife in Saskatchewan, Canada, by investigating the detection and quantification of lead in hunted animal remains (Chapter 2) and assessing …
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Examination of Scavenging Associated with Wolves
… this inflicts on the skeleton. The types of scavengers present vary from region to region, and in the Northwest, large carnivores such as bears, mountain lions, and canids are abundant. These types of carnivores can not only inflict incredible trauma to a skeleton, they can also disperse the …
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Examination of Scavenging Associated with Wolves
… this inflicts on the skeleton. The types of scavengers present vary from region to region, and in the Northwest, large carnivores such as bears, mountain lions, and canids are abundant. These types of carnivores can not only inflict incredible trauma to a skeleton, they can also disperse the …
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Critical role of ROS in capsaicin-induced hyperalgesia
… in central sensitization, the effects of ROS scavengers and donors on pain behaviors were examined in mice. The capsaicin-induced hyperalgesia was used as a pain model since it has 2 distinctive pain components, primary and secondary hyperalgesia representing peripheral and central …
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Determinants of predator abundance in northern KwaZulu-Natal: top-down or bottom-up?
… relative abundance of mesopredators, facultative scavengers, and an apex predator were affected primarily by bottom-up processes (prey abundance) or by top-down processes (predator abundance), or a combination of the two. Central to this study was elucidating the complex relationship between …
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Lead exposure in large carnivores in the greater Yellowstone ecosystem
… fall (n = 214) in 2009. Therefore, unlike avian scavengers, mammalian scavengers do not appear to be ingesting lead ammunition fragments. Grizzly bears do, however, exhibit blood lead levels higher than what is considered safe in humans, but the source of this exposure remains unknown.
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Lead exposure in large carnivores in the greater Yellowstone ecosystem
… fall (n = 214) in 2009. Therefore, unlike avian scavengers, mammalian scavengers do not appear to be ingesting lead ammunition fragments. Grizzly bears do, however, exhibit blood lead levels higher than what is considered safe in humans, but the source of this exposure remains unknown.
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Mathematical demography of the Cape vulture
… coprotheres is one of the world's largest avian scavengers and was once widely distributed in southern Africa, to which it is endemic. It has suffered major changes of fortune in recorded history and has, at least twice, undergone large range contractions and expansions in the Cape Province. It …
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The metabolism of iron-sulfur clusters during hydrogen peroxide stress in escherichia coli
… that aerobic organisms must synthesize H2O2 scavengers to avoid poisoning their own pathways. However, the basal H2O2 scavengers are likely insufficient to protect organisms from exogenous H2O2 which results in several injuries including the oxidation of dehydratase [4Fe-4S] clusters. To …
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Use of Antimycotics, Modified Atmospheres, and Packaging to Affect Mold Spoilage in Dairy Products
The effects of natamycin, oxygen scavengers and a 25% CO₂:75% N₂ modified atmosphere on the growth of <I>Penicillium roqueforti</I> in shredded cheddar and mozzarella cheese stored at 10°C for 0, 60, 120, or 180 day was studied. Microbiological and sensory testing was assessed on 0, 7, 14 and 21 …
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Behavioural and eco-physiological studies on blue wildebeest Connochaetes taurinus at the Etosha National Park
… status, disease and parasites, predators and scavengers, and population structure. Activity patterns in the free-ranging population were measured over a period of one year, using marked individuals and by scanning herds. The population spent, on average, 53% of its time resting, 33% grazing, …
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