Geosmin
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Remoção de compostos odoríferos de águas de abastecimento através de processos de aeração, dessorção gasosa e nanofiltração
As atividades humanas em bacias hidrográficas introduzem nos cursos de água nutrientes que aceleram o processo natural de eutrofização, favorecendo a ocorrência de florações de algas e cianobactérias. Estas florações se caracterizam por um crescimento explosivo destes microrganismos. Entre os diversos impactos negativos trazidos pelas florações e
Publicado em: 2010
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2. Avaliação do potencial de processos oxidativos avançados para remediação de águas contaminadas com geosmina e 2-MIB
In this work, the efficiency of some homogeneous advanced oxidation processes (UVC/H2O2, Fe2+/H2O2, UVC/Fe2+/H2O2, UVA/Fe2+/H2O2, solar/Fe2+/H2O2) was investigated toward the degradation of geosmin and 2-methylisoborneol (2-MIB). The effect of relevant experimental parameters (ie. pH, Fe2+ and H2O2 concentration) was first investigated by factorial design, u
Química Nova. Publicado em: 2008
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3. Effects of farnesol and the off-flavor derivative geosmin on Streptomyces tendae.
Effects of the sesquiterpene farnesol (3,7,11-trimethyl-2,6,10-dodecatrien-1-ol) and the sesquiterpene derivative geosmin (1,10-trans-dimethyl-trans-9-decalol) were investigated in a geosmin-producing actinomycete, Streptomyces tendae. Exposure to 300 microM farnesol reduced biomass (fresh matter) accumulation by 97% compared with biomass accumulation by con
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4. Identification of geosmin as a volatile metabolite of Penicillium expansum.
Cultures of Penicillium expansum produce a musty, earthy odor. Geosmin [1,10-trans-dimethyl-trans(9)-decalol] was identified by gas chromatography-mass spectrometry from headspace samples of P. expansum cultures. Olfactory comparison of P. expansum cultures with a geosmin standard indicated geosmin is the primary component of the odor associated with P. expa
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5. Geosmin, an Earthy-Smelling Substance Isolated from Actinomycetes
Geosmin, an earthy-smelling substance, has been isolated from several actinomycetes. Production of 1 mg per liter of whole broth was obtained from Streptomyces griseus LP-16. After preliminary separations, pure geosmin was isolated in milligram amounts by gas chromatography. Geosmin is a neutral oil, with an approximate boiling point of 270 C, which contains
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6. Production of Geosmin in Fermentors and Extraction with an Ion-Exchange Resin
A method for growing Streptomyces griseus LP-16 in fermentors and extracting and purifying geosmin, using an ion-exchange resin, is described.
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7. Effect of Photon Fluence Rate and Specific Growth Rate on Geosmin Production of the Cyanobacterium Oscillatoria brevis (Kütz.) Gom
The production of geosmin from the cyanobacterium Oscillatoria brevis was studied as a function of the photon fluence rate and appears to be related to the chlorophyll content.
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8. Geosmin and 2-Methylisoborneol from Cyanobacteria in Three Water Supply Systems
Three Oscillatoria strains and one Anabaena species were isolated from three different water supply systems in California that experienced earthy-musty taste and odor problems in their drinking water. Unialgal cultures, free of actinomycetes, were purged using the Grob closed-loop stripping analysis method, and the resulting methylene chloride extracts were
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9. PCR-targeted Streptomyces gene replacement identifies a protein domain needed for biosynthesis of the sesquiterpene soil odor geosmin
Streptomycetes are high G+C Gram-positive, antibiotic-producing, mycelial soil bacteria. The 8.7-Mb Streptomyces coelicolor genome was previously sequenced by using an ordered library of Supercos-1 clones. Here, we describe an efficient procedure for creating precise gene replacements in the cosmid clones by using PCR targeting and λ-Red-mediated recombinat
The National Academy of Sciences.
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10. Dynamics of the Volatile Organic Substances Associated with Cyanobacteria and Algae in a Eutrophic Shallow Lake
The volatile substances present in a eutrophic shallow lake were determined qualitatively and quantitatively during the growing season, allowing a first-time analysis of the dynamics of these compounds in a water body. The major compounds found were β-cyclocitral, α-cyclocitral, β-ionone, 1,3,3-trimethylcyclohexene, 2,2,6-trimethylcyclohexanone, 2,6,6-tri
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11. Expression and mechanistic analysis of a germacradienol synthase from Streptomyces coelicolor implicated in geosmin biosynthesis
The PCR has been used to amplify a 2,181-bp ORF from Streptomyces coelicolor A3(2), designated SC9B1.20 (= SCO6073), encoding a protein of 726 amino acids and showing significant sequence similarity at the deduced amino acid level in both the N-terminal and C-terminal halves to the known sesquiterpene synthase pentalenene synthase. The full-length recombinan
The National Academy of Sciences.