Competition for mixed substrates by microbial populations

Yoon, Heeyoung; Klinzing, G.; Blanch, Harvey W.

doi:10.1002/bit.260190809

Cited by 198 publications

(114 citation statements)

References 18 publications

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“…Under these conditions, the substrates concentrations maintained by the mixotrophs become lower than the concentrations established by the specialist population that will be washed out from the chemostat. This phenomenon has been extensively studied and described with similar results for pure cultures with different substrates (KovarovaKovar and Egli 1998;Kuenen 1983;Yoon et al 1977).…”

Section: Coupling Between Metabolic Function and Community Compositionmentioning

confidence: 60%

Diversity of microbial communities in open mixed culture fermentations: impact of the pH and carbon source

Temudo

Muyzer

Kleerebezem

et al. 2008

Appl Microbiol Biotechnol

109

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Anaerobic fermentation by an open mixed culture was investigated at different pH values (4-8.5) and with three substrates (glucose, glycerol and xylose). The populations established in each condition were assessed by denaturing gradient gel electrophoresis analysis of the 16S ribosomal RNA gene fragments. The fermentation pattern and the composition of the microbial population were also evaluated when operational variations were imposed (increase of substrate concentration or introduction of a second substrate). The experimental results demonstrated that at low and high pH values, a clearly different fermentation pattern was associated with the dominance of a specialised group of clostridiae. At intermediate pH values, the product spectrum was rather variable and seemed to be sensitive to variations in the microbial community. Different substrates resulted in the establishment of different microbial communities. When fed with a mixture of two substrates, mixotrophic microorganisms (capable of degrading both substrates) were found to overgrow the originally dominant specialists. Overall, the experiments have shown that some operational variables have a clear impact on the fermentation pattern and on the population established. However, a uniform relationship between the process characteristics (associated to a metabolic response) and the microbial population present is not always possible.

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Section: Coupling Between Metabolic Function and Community Compositionmentioning

confidence: 60%

Diversity of microbial communities in open mixed culture fermentations: impact of the pH and carbon source

Temudo

Muyzer

Kleerebezem

et al. 2008

Appl Microbiol Biotechnol

109

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“…The simplest mixed culture interaction is pure competition and is the subject of man y rccent theoretical (34,41,45) and experimental (11,18,44) studies. Other interaction have also been recently investigated (12,26).…”

Section: 2 Microbial Deandradatiod Olôi'odlatic Hydrocarbonsmentioning

confidence: 99%

Biodegradation of aromatic compounds in a self‐cycling fermenter (SCF)

Sarkis

Cooper

1994

Can J Chem Eng

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ABSTRACT. .The Self-Cycling Fermentation (SCF) techniql 1 e was applied to the biodegradation of several aromatic compounds by Pseudomonas putida and p"'j'eudolllomis fluorescell ..... The SCF technique was shown to be a useful research tool in aromatic biodegradation studies as weil as a potential pollution treatment method. Advantages of SCFs include stable and highly repeatable performance and almost complete substrate consumption. Biomass concentration.cycle time and the minimum dissolved oxygen level were monitored from cycle to cycle and the variation of these parameters during steady-state operation was less than 5(X,. The aromatic compounds used in this ~tudy were sodium benzoate, p-anisaldehyde and 4-methoxybenzylidine-4-n-butylaniline (MBBA). Consumptions of 93-100% were achieved for thesc compounds usingtheSCFtechnique. Consumption rates ofaromatic compounds wereshown to he considerably higher than in conventionaJ fermenters. Cycle time was found to he a usefuJ parameter forcomparing growth of ditrerent organisms on aromatic substrates. The cycle tirr.e was dependant on substrate concentration for p-anisaJdehyde. This dependence was shown to be due to the presence of an unidentified, inhibitory intermediate. .,

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“…2), suggested the utilization of other organic material rather than MCs as carbon and nitrogen sources, indicated the loss of degradative ability in natural water. In addition, a huge number of microorganisms existed in natural environment and it was reported that competition among microorganisms may result in the dominance of one species in a relatively short time (Hsu et al, 1981;Yoon et al, 1977). In terms of similar pattern of MCs' degradation and bacterial growth with control-2, it was safe to conclude that MS-1 and MS-2 had failed in the competition with indigenous bacteria in our study.…”

Section: The Effect Of Isolation Strategy On Bacteria Adaptability Inmentioning

confidence: 64%

Enhanced and continued degradation of microcystins using microorganisms obtained through natural media

Hong

Pan

2014

Journal of Microbiological Methods

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Microorganisms isolated through artificial media are often unsustainable in biodegrading microcystins (MCs) in natural water. Here we studied alternative approaches to isolate MCs-degrading bacteria using natural media. In comparison to two species (MS-1 and MS-2) isolated from artificial media and the failure of bacterial colonies formation using water extracts of sediment (10%, w/v), five colony species (WC-1 to WC-5) appeared using concentrated water extracts of sediment that is 10-fold enhancement of nutrient level. In the simulated biodegradation test in Lake Taihu water with continuous supply of MCs, a lag phase of 6 days was required for MS-1 and M-2 to degrade 13% and 15% of the added MC-RR and MC-LR, respectively, whereas the lag phase was only 3 days with approximately 44% and 31% removal of the added MC-RR and MC-LR by WC-1 to WC-5. During the continuous supply experiment, degradation of MCs by MS-1 and MS-2 stopped after 3 days, while degradation of MCs by WC-1 to WC-5 lasted continuously throughout the 18 day test period with 2 to 6-fold enhancement of removal rate. 16S rRNA gene sequences and phylogenetic analysis indicated the potential to amplify species of MCsdegrading bacteria when natural media were used. The results suggested that the increased adaptability of bacteria obtained through concentrated natural media was responsible for the enhanced and continued biodegradation under simulated natural water conditions.

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Competition for mixed substrates by microbial populations

Cited by 198 publications

References 18 publications

Diversity of microbial communities in open mixed culture fermentations: impact of the pH and carbon source

Diversity of microbial communities in open mixed culture fermentations: impact of the pH and carbon source

Biodegradation of aromatic compounds in a self‐cycling fermenter (SCF)

Enhanced and continued degradation of microcystins using microorganisms obtained through natural media

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