Survival and function of a genetically engineered pseudomonad in aquatic sediment microcosms
- National Research Center for Biotechnology, Braunschweig (Germany)
Pseudomonas sp. strain B13 FR1(pFRC20P) is a genetically engineered microorganism (GEM) which is able to degrade chloro- and methylaromatics through a constructed ortho cleavage pathway. The fate of the GEM and its ability to degrade substituted aromatic compounds in two different aquatic sediments was investigated by using a microcosm system which consisted of intact layered sediment cores with an overlying water column. The GEM survived in Lake Plussee and in Rhine river sediments at densities of approximately 10{sup 5} bacteria per g (dry weight) (1 to 5% of the total CFU) throughout a 4-week period of investigation. According to several criteria, the microcosm system was stable and healthy throughout the experiment and the addition of GEM did not affect the total number of extractable CFU. When compared with uninoculated controls, the presence of the GEM enhanced the rate of degradation of a mixture of 3-chlorobenzoate and 4-methylbenzoate (25 {mu}m each) which had been added to the water column of the sediment cores.
- OSTI ID:
- 7236433
- Journal Information:
- Applied and Environmental Microbiology; (United States), Journal Name: Applied and Environmental Microbiology; (United States) Vol. 58:4; ISSN 0099-2240; ISSN AEMID
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540310* -- Environment
Aquatic-- Basic Studies-- (1990-)
AQUATIC ECOSYSTEMS
AROMATICS
BACTERIA
BIODEGRADATION
BIOLOGICAL PATHWAYS
BIOTECHNOLOGY
CFU
CHEMICAL REACTIONS
DECOMPOSITION
ECOLOGY
ECOSYSTEMS
ENVIRONMENTAL IMPACTS
GENETIC ENGINEERING
MICROCOSMS
MICROORGANISMS
ORGANIC COMPOUNDS
POPULATION DENSITY
PSEUDOMONAS
RIVERS
SEDIMENTS
STREAMS
SURFACE WATERS