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| Content Provider | Springer Nature Link |
|---|---|
| Author | Shi, Hoi Ping Lee, Chi Mei Ma, Wei Hsien |
| Copyright Year | 2006 |
| Abstract | Polyhydroxyalkanoates (PHAs), intracellular carbon and energy reserve compounds in many bacteria, have been used extensively in biodegradable plastics. PHA formation is influenced by nutrient limitations and growth conditions. To characterize the PHA accumulation in a new denitrifying phosphorus-removing bacterium Brachymonas sp. P12, batch experiments were conducted in which the electron acceptor (oxygen or nitrate) was varied and different concentrations of carbon (acetate), nitrogen (NH$_{4}$Cl), and phosphorus (KH$_{2}$PO$_{4}$) were used. Polyhydroxybutyrate (PHB) was the dominant product during PHA formation when acetate was the sole carbon source. The PHB content of aerobically growing cells increased from 431 to 636 mg PHB g$^{−1}$ biomass, but the PHB concentration of an anoxic culture decreased (−218 mg PHB g$^{−1}$ biomass), when PHB was utilized simultaneously with acetate as an electron donor for anoxic denitrification. The specific PHB production rate of the carbon-limited batch, 158.2 mg PHB g$^{−1}$ biomass h$^{−1}$, was much greater than that of batches with normal or excess carbon. The effects of phosphorus and nitrogen concentrations on PHB accumulation were clearly less than the effect of carbon concentration. According to the correlation between the specific PHB production rate and the specific cell growth rate, PHB accumulation by Brachymonas sp. P12 is enhanced by nutrient limitation, is growth-associated, and provides additional energy for the biosynthesis of non-PHB cell constituents to increase the cell growth rate beyond the usual level. |
| Starting Page | 625 |
| Ending Page | 632 |
| Page Count | 8 |
| File Format | |
| ISSN | 09593993 |
| Journal | World Journal of Microbiology and Biotechnology |
| Volume Number | 23 |
| Issue Number | 5 |
| e-ISSN | 15730972 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 2006-09-28 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Brachymonas sp. P12 Growth-associated PHB production Nutrient limitation Electron acceptors COD/N ratios Microbiology Environmental Biotechnology Biochemistry Biotechnology Applied Microbiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Medicine Applied Microbiology and Biotechnology Biotechnology |
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