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 15 of 15 for “"Geosmin"”.
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Monitoring and regulating cyanobacterial metabolites (microcystins and geosmin) in aquatic systems.
… taste and odour compounds, especially geosmin and 2- methylisoborneol is important in the potable water and aquaculture industries. A rapid, robust, sensitive, and cost-effective analysis method using SPE-GCMS has been developed and is capable of detecting both compounds to sub nano …
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Detection, analysis, and photocatalytic destruction of the freshwater taint compound geosmin.
… fish. Two predominant off-flavour compounds are geosmin (GSM) and 2-methylisoborneol (MIB). These compounds are produced by several varieties of cyanobacteria and actinomycetes as metabolic products and can be detected by humans at concentrations as low as 0.015 mg L-1. Removal of GSM and MIB …
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Measuring and modeling geosmin removal from Horsetooth Reservoir water by powdered activated carbon for selected contact times
Presence of geosmin, an odorous algal metabolite produced by cyanobacteria and actinomycetes, has been an issue in drinking waters in Northern Colorado. Geosmin does not pose a health threat; however, it imparts an earthy taste and odor to the finished drinking water even at very low concentrations …
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The Logic of Innately Aversive Olfactory Pathways
… sensory circuit of a microbial odorant, geosmin, as a model to understand how an innately aversive olfactory signal is processed in the brain in order to produce an appropriate behavioural response. We used connectomics, functional imaging, and behavioural assays to determine the anatomy …
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Temperature Effects on Drinking Water Odor Perception
… at either 25°C or 45°C. Samples containing geosmin cooled to 5°C were also evaluated. Sensory analyses experiments indicate that odor intensity is a function of both aqueous concentration and water temperature for geosmin, MIB, nonadienal, n-hexanal, free chlorine, and 1-butanol. The higher …
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Determination of Henry's Law Constants of Odorous Contaminants and Their Application to Human Perception
… odor that is detectable at 4-10 ng/L water. Geosmin, also produced by actinomycetes and blue-green algae, has a detectable earthy odor at 5-10 ng/L. trans-2, cis-6-Nonadienal is enzymatically synthesized from poly-unsaturated fatty acids by diatoms like Synura and has cucumber and fishy odors …
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Oxidation of Disinfection Byproducts and Algae-related Odorants by UV/H₂O₂
… aldehydic algal byproducts in the presence of geosmin and 2-methylisoborneol, which are earthy-musty odorants that commonly occur in drinking water. UV/H₂O₂ is an expensive advanced oxidation process that is used to successfully control geosmin and 2-methylisoborneol. The aqueous oxidation of …
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Identification and characterization of odorous metabolites produced by selected freshwater algae
… by GC-MS. Anabaena laxa retained most of the geosmin it produced within the algal cells. Phormidium sp. produced more 2-methylisoborneol (MIB) than geosmin, and the alga retained only a relatively small amount of either compound within the cells. Synura petersenii produced more …
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Identification and characterization of potent odorants in selected beet root (Beta vulgaris) products
… the most important being 2-acetyl-1-pyrroline, geosmin, methional, furaneol, p-vinylguaiacol, and vanillin due to their very high odor potency. Three 3-alkyl-2-methoxypyrazines (isopropyl, sec-butyl, and isobutyl), as well as 1-octen-3-one, phenylacetic acid, and eugenol, were also identified at …
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Behaviour of trace organics and dissolved organic matter in granular activated carbon filters for drinking water supply
… taste and odour (T&O) causing compounds such as geosmin and 2-methylisoborneol and reducing the concentration of dissolved organic matter (DOM) which contributes to the formation of disinfection by-products. GAC filters were installed at the Hamilton Drinking Water Treatment Station (HDWTS) in …
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Applications of Sensory Analysis for Water Quality Assessment
… detected. Odor intensity was mainly driven by geosmin, but no relationship between strong odors and odorants was observed.
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Evaluation of Dechlorinating Agents and Disposable Containers for Odor Testing of Drinking Water
… solutions of the earthy-smelling compound geosmin and musty-smelling MIB. Interfering odors in reusable containers pose another problem in drinking water odor analysis. The most common odor-analysis methods (TON and FPA) involve the use of glass flasks, which often either develop chalky …
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Macromolecular Reactions and Sensory Perception at the Air-Water-Human Interface
… drinking water. First aim was to understand when geosmin, 2-MIB, and nonadienal become detectable, employing two-resistance mass transfer theory to determine the concentration of odorants in bathroom air. Results showed that water temperature and odorant concentration in water play an important …
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Destruction of algae-produced taste-and-odor compounds by chlorine, potassium permanganate, and chlorine dioxide
… attention has been focused on the formation of geosmin and MIB by blue-green algae (cyanobacteria), which cause earthy and musty odors, respectively. Little work has been performed, however, on equally obnoxious odors caused by other golden-brown and yellow-brown algae which are responsible for …
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Mechanisms Of Nanofilter Fouling And Treatment Alternatives For Surface Water Supplies
… Film>CA) significantly affected spore rejection. Geosmin and methylisoborneol have molecular weights of 182 and 168 respectively, and are byproducts of algal blooms, which commonly increase taste and odor as measured by the threshold odor number (TON) in drinking water. Although these molecules …