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Environmental and nutritional factor...

Schrader, Kevin Kinrade.

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Environmental and nutritional factors affecting the production of off-flavor compounds by aquatic microorganisms.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Environmental and nutritional factors affecting the production of off-flavor compounds by aquatic microorganisms./
Author:	Schrader, Kevin Kinrade.
Description:	214 p.
Notes:	Source: Dissertation Abstracts International, Volume: 56-09, Section: B, page: 4719.
Contained By:	Dissertation Abstracts International56-09B.
Subject:	Biology, Microbiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9544771

Environmental and nutritional factors affecting the production of off-flavor compounds by aquatic microorganisms.
Schrader, Kevin Kinrade.

Environmental and nutritional factors affecting the production of off-flavor compounds by aquatic microorganisms. - 214 p.

Source: Dissertation Abstracts International, Volume: 56-09, Section: B, page: 4719.

Thesis (Ph.D.)--Auburn University, 1995.

Water and sediment samples were collected monthly from July, 1990, through October, 1991, from aquaculture ponds near Auburn, Alabama. Levels of geosmin and 2-methylisoborneol (MIB) were determined; actinomycetous propagules, phytoplankton, total cyanobacteria, and species of the cyanobacterium Anabaena were enumerated; and samples were screened for geosmin- and/or MIB-producing species of actinomycetes and cyanobacteria. Water temperature, water pH, sediment pH, and dissolved oxygen in the water were determined at each sampling date. Geosmin was detected in the sampled ponds more frequently than MIB. Regression analyses of environmental variables and levels of geosmin and MIB revealed weak correlations. High levels of geosmin did not correlate with high numbers of actinomycetous propagules or with the abundance of phytoplankton, cyanobacteria, or Anabaena spp.Subjects--Topical Terms:

1017734
Biology, Microbiology.

Environmental and nutritional factors affecting the production of off-flavor compounds by aquatic microorganisms.
LDR:03146nmm 2200277 4500 001 1865108
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008 130614s1995 eng d
035 $a (UnM)AAI9544771
035 $a AAI9544771
040 $a UnM $c UnM
100 1 $a Schrader, Kevin Kinrade. $3 1952571
245 1 0 $a Environmental and nutritional factors affecting the production of off-flavor compounds by aquatic microorganisms.
300 $a 214 p.
500 $a Source: Dissertation Abstracts International, Volume: 56-09, Section: B, page: 4719.
500 $a Director: Willard T. Blevins.
502 $a Thesis (Ph.D.)--Auburn University, 1995.
520 $a Water and sediment samples were collected monthly from July, 1990, through October, 1991, from aquaculture ponds near Auburn, Alabama. Levels of geosmin and 2-methylisoborneol (MIB) were determined; actinomycetous propagules, phytoplankton, total cyanobacteria, and species of the cyanobacterium Anabaena were enumerated; and samples were screened for geosmin- and/or MIB-producing species of actinomycetes and cyanobacteria. Water temperature, water pH, sediment pH, and dissolved oxygen in the water were determined at each sampling date. Geosmin was detected in the sampled ponds more frequently than MIB. Regression analyses of environmental variables and levels of geosmin and MIB revealed weak correlations. High levels of geosmin did not correlate with high numbers of actinomycetous propagules or with the abundance of phytoplankton, cyanobacteria, or Anabaena spp.
520 $a Lyngbya cf. subtilis, a geosmin-producing species of cyanobacteria, was isolated from pond S3. Streptomyces halstedii, an actinomycete isolated from the sediment of pond B4, was found to consistently produce geosmin while grown in laboratory culture, and was used in physiological studies to determine the environmental and nutritional conditions which promote or inhibit geosmin production by actinomycetes. Streptomyces halstedii produced maximal amounts of geosmin at pH 9 and $3 5\sp\circ\rm C. $ Increased geosmin production was favored by low concentrations of nitrate-, ammonium-, and organic nitrogen. Mannitol as a sole source of carbon promoted maximal geosmin production, and increasing phosphorus concentration also enhanced geosmin production. Wide carbon to nitrogen ratios and wide nitrogen to phosphorus ratios decreased geosmin production. Increasing concentrations of calcium, copper, iron, manganese, and zinc inhibited geosmin production. Increased carbon dioxide levels increased geosmin yields while reduced oxygen levels inhibited geosmin production. Oscillatoria tenuis UTEX #1566 culture and supernatant (from the centrifugation of O. tenuis culture) promoted geosmin production by S. halstedii indicating a synergistic relationship between O. tenuis UTEX #1566 and S. halstedii in the enhancement of geosmin production by S. halstedii.
590 $a School code: 0012.
650 4 $a Biology, Microbiology. $3 1017734
650 4 $a Biology, Ecology. $3 1017726
690 $a 0410
690 $a 0329
710 2 0 $a Auburn University. $3 1020457
773 0 $t Dissertation Abstracts International $g 56-09B.
790 1 0 $a Blevins, Willard T., $e advisor
790 $a 0012
791 $a Ph.D.
792 $a 1995
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9544771