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 45 for “"Organic substances"”.
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Development of a test system for screening toxic substances: a comparison using organic substances
… was to develop a test system for screening toxic substances by predicting their aquatic ecosystem effects. The system studied was a static, one liter microcosm with a diverse species assemblage. Teh microcosm was composed of biotic inoculum, chemically defined medium and sediment. The biotic …
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The removal of specific molecular weight fractions of trihalomethane precursors by alum coagulation
… concentration, pH and the molecular weight of organic substances present in a water were evaluated in regards to the removal of trihalomethane (THM) precursors from a surface water supply, Peak Creek, in southwestern Virginia. Water was coagulated with various doses of alum with the pH …
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Intramolecular [4 + 2] cycloadditions of conjugated enynes with highly strained cyclic alkenes
… are key features in numerous naturally occurring organic substances, many of which are biologically important natural products. This thesis describes studies directed towards the development of a [4 + 3] annulation strategy for the synthesis of seven-membered carbocycles involving the …
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A chemical investigation of some New Zealand honeys
… straight chain mono- and dibasic acids, aromatic substances, monoterpenes and degraded carotenoid-like extractives. Compounds reported for the first time in honey include 2,6-dimethyl-6(8)-hydroxy-2-trans-2, 7-octadienoic acid, 3 ,5 ,5-trimethylcyclohex-2-en-1-one, 3 ,5 …
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Removing Soluble Organic Contaminants From Water Supplies by Lime Softening
… numbers of potentially hazardous trace organic contaminants in drinking water supplies has raised considerable public concern. Lime softening, a commonly used water treatment process, is capable of removing certain soluble organic contaminants; but the types of contaminants that can be …
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Laser produced vaporization of materials for use in mass spectroscopic analysis
… of almost any material, including complex organic substances, can be obtained from a selected surface area, and small chemical concentrations can be detected. In what follows the vaporization process appropriate to ordinary lasers of moderate power output is discussed, and experimental …
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Characterization of sorption processes of organic cations onto oxidic surfaces
… of polar and often ionizable anthropogenic organic trace compounds, such as pharmaceutical residues, can be detected in various stages of the water cycle, there is a need to elucidate the effects and behavior of such substances in the aquatic environment. Despite the fact that numerous …
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ΠΟΛΥΗΛΕΚΤΡΟΝΙΚΗ ΦΩΤΟΑΝΑΓΩΓΗ ΤΩΝ ΕΤΕΡΟΠΟΛΥΑΝΙΟΝΤΩΝ P2W18O62 , PV2W10O40 , PV2MO10O40 . ΣΥΜΒΟΛΗ ΣΤΗ ΦΩΤΟΧΗΜΙΚΗ ΜΕΤΑΤΡΟΠΗ ΚΑΙ ΑΠΟΘΗΚΕΥΣΗ ΤΗΣ ΗΛΙΑΚΗΣ ΕΝΕΡΓΕΙΑΣ
… NEAR VISIBLE LIGHT IN PRESENCE OF A VARIETY OF ORGANIC SUBSTANCES. IN THE CASE OF P2W18O626- THE PHOTOREDUCTION PROCEEDS STEPWISE AND LEADS TO THE FORMATION OF PRODUCTS THAT ARE ABLE, FROM A THERMODYNAMIC POINT OF VIEW, TO REDUCE WATER PRODUCING HYDROGEN H2-EVOLUTION INDEED TAKES PLACE WITH AND …
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An investigation into the use of smectitic clay soil for the containment and treatment of petrochemical waste
The manufacture, transport, use and disposal of organic chemicals may result in the release of significant quantities of organic substances into soil, from which they are subject to possible transport into underlying groundwater. Many of these organic chemicals are potentially toxic (Wilson et al., …
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Indicators of bioactivity and floral origin of New Zealand honeys
… floral origins were examined. The extractable organic substances of five New Zealand honeys: beech honeydew honey, kamahi, pohutukawa, rata and tawari were determined by GC-MS of methylated extracts. This survey confirmed the results of a previous investigation and established ranges for marker …
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Integrating bio-based resource recovery and treatment into municipal solid waste management in developing countries: a focus on anaerobic digestion
… be suitable in developing cities due the highly organic nature of their waste. AD entails the degradation of organic substances in the absence of oxygen, and its main products are CH 4-rich biogas and the remaining sludge. AD occurs in four main phases (hydrolysis, acidogenesis, acetogenesis and …
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The role of phytoplankton in the nutrition of the larvae of the giant freshwater prawn Macrobrachium rosenbergii (DeMan) (Crustacea : Palaemonidae)
… a mechanism for the uptake of these dissolved organic substances does exist in the larvae. It was also shown, however, that the dissolved organic compounds are not of major importance as a source of energy in the nutrition of the larvae. The possible role of dissolved organic compounds is …
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Granular activated carbon pretreatment for the removal of trihalomethane precursors
… that THM precursors, as measured by total organic carbon (TOC) and THMFP, could be removed from an untreated surface water supply by GAC contact. The degree to which THM precursors were removed was directly related to EBCT, the most effective being 26 minutes (2 gpm). GAC contact appeared …
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Identification of Molecules by Spectral Imaging
… the exact UV-Vis and fluorescence spectra of organic substances including Rhodamine 6G, Doxorubicin and UV-Vis spectra inorganic compounds including silver (Ag), gold (Au) nanoparticles (NPs). After that, we used the Q-TOF LC/MS system to quantify the maximum and minimum detectable …
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Biology and potential biogeochemical impacts of novel predatory flavobacteria
… of photoheterotrophy, scavenging of polymeric organic substances, pathogenesis on animals, the degradation and lysis of phytoplankton blooms and, now, predation on bacterial communities. Strains from the two genera were found to exhibit divergent prey specificities and growth yields when …
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Nanoparticle effects on cell migration
… to a chemical stimulus. Chemoattractants are inorganic and organic substances, usually proteins, that create a concentration gradient that attracts cells to move towards them. Chemoattractants are known to be involved in immune responses and wound healing processes in eukaryotic cells. With the …
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Complexation state of iron and copper in ambient particulate matter and its effect on the oxidative potential
… whether transition metals are complexed with organic compounds or free in ambient PM, which could be an important factor determining their ability to generate ROS, is not well understood. We target to investigate the complexation states of important atmospheric metals in this study. A novel …
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Biology and potential biogeochemical impacts of novel predatory flavobacteria
… of photoheterotrophy, scavenging of polymeric organic substances, pathogenesis on animals, the degradation and lysis of phytoplankton blooms and, now, predation on bacterial communities. Strains from the two genera were found to exhibit divergent prey specificities and growth yields when …
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Straight pipes and household wastewater discharges into the rural Alabama and impact on watershed water quality with wetland land-uses
… ortho-phosphorus, nitrite, nitrate, dissolved organic carbon, optical indices), and microbiological (E. coli) water quality parameters. Excitation-emission matrixes (EEMs) Parallel Factor Analysis (PARAFAC) was used to identify and classify fluorescence emitting organic substances based on …
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Emissions of Bioaerosols from Composting Facilities
… procedure leading to the degradation of organic substances into stable end-products that can be used as fertilizer. However, one of the major public health concerns is the emissions of bioaerosols from the composting sites. Bioaerosol dispersion across composting facilities, due to …
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