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Interactions between Microorganisms Isolated from Aquatic Environments and the Cyclodiene Organochlorine Pesticides Aldrin and Dieldrin

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Date Issued:
1974
Summary:
Decomposition of the pesticides aldrin and dieldrin by aquatic microorganisms may result in more harmful products affecting the ecosystem. Isolates from fresh, brackish, and littoral water were cultured using, variously, selective media, enriched laboratory ecosystems, and impregnated wood strips and assessed qualitatively and quantitatively for action on pesticides by thin-layer chromatography, gas-liquid chromatography, and 14C-labeled pesticide autoradiography. Growth was measured in terms of dry wt and cell nitrogen. Small amounts of possible metabolites were indicated in most isolate preparations. Cellulolytic Z. xylestrix grew well in media containing 10-500 ug/ml pesticide. Growth was stimulated by small quantities of the chemical and the fungus accumulated pesticides to levels 2000 times higher than the original medium concentration. Uptake increased linearly with increasing pesticide concentration. A significant portion of the pesticides appeared to be chemically altered, but the products were not specifically identified.
Title: Interactions between Microorganisms Isolated from Aquatic Environments and the Cyclodiene Organochlorine Pesticides Aldrin and Dieldrin.
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Name(s): Quevedo, Rafael A.
Sguros, Peter L., Thesis advisor
Florida Atlantic University, Degree grantor
Type of Resource: text
Genre: Electronic Thesis Or Dissertation
Date Created: 1974
Date Issued: 1974
Publisher: Florida Atlantic University
Place of Publication: Boca Raton, Fla.
Physical Form: application/pdf
Extent: 109 p.
Language(s): English
Summary: Decomposition of the pesticides aldrin and dieldrin by aquatic microorganisms may result in more harmful products affecting the ecosystem. Isolates from fresh, brackish, and littoral water were cultured using, variously, selective media, enriched laboratory ecosystems, and impregnated wood strips and assessed qualitatively and quantitatively for action on pesticides by thin-layer chromatography, gas-liquid chromatography, and 14C-labeled pesticide autoradiography. Growth was measured in terms of dry wt and cell nitrogen. Small amounts of possible metabolites were indicated in most isolate preparations. Cellulolytic Z. xylestrix grew well in media containing 10-500 ug/ml pesticide. Growth was stimulated by small quantities of the chemical and the fungus accumulated pesticides to levels 2000 times higher than the original medium concentration. Uptake increased linearly with increasing pesticide concentration. A significant portion of the pesticides appeared to be chemically altered, but the products were not specifically identified.
Identifier: FA00000815 (IID)
Degree granted: Thesis (M.S.)--Florida Atlantic University, 1974.
Note(s): Charles E. Schmidt College of Science
Subject(s): Pesticides--Environmental aspects
Held by: Florida Atlantic University Libraries
Sublocation: Digital Library
Persistent Link to This Record: http://purl.flvc.org/fau/fd/FA00000815
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Host Institution: FAU
Is Part of Series: Florida Atlantic University Digital Library Collections.