Results 181 to 190 of about 5,637 (223)

Algaecide Controls Geosmin in Tulsa

Journal AWWA, 2022
Key TakeawaysFor years, geosmin was causing taste and odor (T&O) issues for the residents of Tulsa, Okla.With the application of algaecide at the pipe's intake, the median geosmin concentration was reduced by 83%.While utilities should focus on source water quality, the application of algaecide can help provide immediate relief for T&O issues ...
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Geosmin Biosynthesis. Streptomyces coelicolor Germacradienol/Germacrene D Synthase Converts Farnesyl Diphosphate to Geosmin

Journal of the American Chemical Society, 2006
Geosmin is responsible for the characteristic odor of moist soil. Incubation of recombinant germacradienol synthase, encoded by the SCO6073 (SC9B1.20) gene of the Gram-positive soil bacterium Streptomyces coelicolor, with farnesyl diphosphate (2, FPP) in the presence of Mg2+ gave a mixture of (4S,7R)-germacra-1(10)E,5E-diene-11-ol (3) (74%), (-)-(7S ...
Jiaoyang, Jiang, Xiaofei, He, David E, Cane   +2 more
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Identification of geosmin biosynthetic gene in geosmin-producing colonial cyanobacteria Coelosphaerium sp. and isolation of geosmin non-producing Coelosphaerium sp. from brackish Lake Shinji in Japan

Harmful Algae, 2019
Geosmin is an earthy-muddy smelling compound produced in aquatic ecosystems by microorganisms including cyanobacteria. An increase in geosmin levels affecting the local fishery occurred in May 2007 in Lake Shinji, Japan, and geosmin-producing colonial cyanobacterium, Coelosphaerium sp.
Shohei, Hayashi, Shuji, Ohtani, Toshiyuki, Godo, Yukari, Nojiri, Yukiko, Saki, Toshiaki, Esumi, Hiroshi, Kamiya   +6 more
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Biotransformations of (+/−)-geosmin by terpene-degrading bacteria

Biodegradation, 2009
Two terpene-degrading bacteria able to transform (+/-)-geosmin have been identified. Pseudomonas sp. SBR3-tpnb, following growth on gamma-terpinene, converts (+/-)-geosmin to several products; the major products are ketogeosmins. Rhodococcus wratislaviensis DLC-cam, isolated on D-camphor, also converts (+/-)-geosmin to several oxidation products ...
Richard W, Eaton, Peter, Sandusky
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Stereodifferentiation of geosmin in wine

European Food Research and Technology, 2001
Geosmin (trans-1,10-dimethyl-trans-9-decalol), a well-known, highly odorous compound, has recently been identified and quantified in red and sweet white wines, as well as in grape juice before alcoholic fermentation. Geosmin is a chiral compound and the (–) form is much more odoriferous than the (+) form.
Darriet, P., Lamy, S., La Guerche, S., Pons, M., Dubourdieu, Denis, Blancard, Dominique, Steliopoulos, P., Mosandl, A.   +7 more
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Reservoir Circulation Reduces Geosmin Production

Opflow, 2008
This article discusses an effort at Wake Forest Reservoir, North Carolina, to mitigate taste and odor issues caused by microorganisms. A new approach was used that consisted of releasing compressed air into the bottom of the reservoir through an air‐diffuser array. To study the link between water chemistry, stratification, and taste and odor production,
George Pesacreta, Ellen Braun‐Howland, Ann St. Amand   +2 more
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A Novel Type of Geosmin Biosynthesis in Myxobacteria

The Journal of Organic Chemistry, 2005
The biosynthesis of geosmin (1) and (1(10)E,5E)-germacradien-11-ol (2), two volatile terpenoid compounds emitted by the myxobacteria Myxococcus xanthus and Stigmatella aurantiaca, was investigated in feeding experiments with different labeled precursors.
Dickschat, J., Bode, H., Mahmud, T., Muller, R., Schulz, S.   +4 more
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Adsorption kinetics of MIB and geosmin

Journal AWWA, 1996
Well‐established and alternative modeling approaches involving the homogeneous surface diffusion model were used to investigate several parameters.The kinetics of 2‐methylisoborneol (MIB) and geosmin are examined using laboratory and field data and through model simulations using the homogeneous surface diffusion model (HSDM).
Chih Huang, John E. Van Benschoten, James N. Jensen   +2 more
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Compost Stability Assessment Using a Secondary Metabolite: Geosmin

Environmental Technology, 2004
Composting is a process involved not only in transformation of organic matter (OM), but also for transition of the microbial community. Microorganisms can directly provide important information on the stages and characteristics of composting. This paper was aimed at characterizing compost stability by a microbial secondary metabolite, geosmin, which is
H F, Li, T, Imai, M, Ukita, M, Sekine, T, Higuchi   +4 more
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Heterologous production of (-)-geosmin in Saccharomyces cerevisiae

Journal of Biotechnology
(-)-Geosmin has high demand in perfumes and cosmetic products for its earthy congenial aroma. The current production of (-)-geosmin is either by distillation of sun-baked soil or by inefficient chemical synthesis because of the presence of multiple chiral centers. Fermentation processes are not viable as the titers of the Streptomyces sp.
Dheeraj Madhukar, Mahajan, Pramod Shankar, Kumbhar, Rishi, Jain   +2 more
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