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Digitale Medien

Possible Adverse Effect of Protozoa on Effluent Purification Systems (1972)

PIRT, S. J. ; BAZIN, M. J.

[s.l.] : Nature Publishing Group

Nature 239 (1972), S. 290-290

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] An effluent is biologically purified by the utilization of the soluble waste as a nutrient or substrate for microbial growth and metabolism. It is assumed that bacteria are the principal agents of soluble waste removal. There are also protozoa which consume the bacteria and thereby contribute to ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/239290a0

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Digitale Medien

Substrate Concentration and Plasmid Transfer Frequency between Bacteria in a Model Rhizosphere (2000)

Pearce, D. A. ; Bazin, M. J. ; Lynch, J. M.

Springer

Microbial ecology 40 (2000), S. 57-63

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ISSN: 1432-184X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract The influence of substrate concentration on plasmid transfer frequency in the rhizosphere was investigated using a physical model employing a hollow fiber membrane instead of a real root. The absolute number of transconjugants produced increased with increasing substrate (glucose) concentration, but the plasmid transfer frequency decreased exponentially with increasing substrate concentration from 4.4 × 10-3 at 90 μg ml-1 glucose to 1.35 × 10-5 at 3600 μg ml-1 glucose. These results were found to be heavily dependant on donor to recipient ratio and distribution of strains, but independent of initial donor and recipient inoculum density and regime. These observations also show that plasmid transfer frequency is reduced at high substrate concentrations, which suggests that plasmid transfer is either stimulated when growth limiting nutrient is scarce or inhibited when it is abundant.