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Polyhydroxyalkanoates conditions

Valappil, S., Rai, R., Bucke, C., Roy, I. Polyhydroxyalkanoate biosynthesis in Bacillus cereus SPV under varied limiting conditions and an insight into the biosynthetic genes involved. J. Appl. Microbiol. 104, 1624—1635 (2008)... [Pg.418]

Polyhydroxyalkanoates (PHAs) are polyesters formed by many prokaryotic micro-organisms-when unbalanced nutritional conditions are chosen for die (Hoducing cells Up to more than 90% of the cell dry weight can be accounted for as polymer. Besides the homopolyester poly-R-3-hydroxybutanoate, consisting of 3-hydroxybutanoate (3HB) only, two main types of copolyesters can be formed by different microorganisms. The first type of PHAs always contains C3 units in the polymer backbone, but the... [Pg.115]

Abstract Polyhydroxyalkanoates (PHA) are intracellular polymers stored by many bacterial species. Presently PHA arc industrially produced by pure cultures fermentation where high quality substrates are used. Mixed cultures using raw substrates are able to produce PHA when submitted to transient conditions like oscillations on substrate feeding or on oxygen supply. The yield on PHA produced by activated sludge submitted to these dynamic conditions reach values comparable to those obtained by the pure cultures, being the first process less cost intensive than die last one. The chain length of the polymer produced in both processes is similar. [Pg.167]

Satoh, H., Mino, T. and Matsuo, T., 1992, Uptake of organic substrates and accumulation of polyhydroxyalkanoates linked with glycolysis of intracellular carbohydrates under anaerobic conditions in the biological excess phosphate removal processes. Wat. Sci. Technol, 26 933-942. [Pg.176]

Lillo, J.A.G. and Rodriguez-Valera, F. (1990) Effects of culture conditions on poly (p-hydroxybutyric acid) production by Haloferax mediterranei. Applied Environmental Microbiology, 56, 2517-2521. Quillaguaman, J., Guzman, H., Van-Thuoc, D. and Kaul, R.H. (2010) Synthesis and production of polyhydroxyalkanoates by halophQes current potential and future prospects. Applied Microbiology and Biotechnology, 85,1687-1696. [Pg.163]

Abstract Polyhydroxyalkanoates (PHAs) are energy- and intracellular carbon-storage compounds that can be mobilized and used when carbon is a limiting resource. Intracellular accumulation of PHA enhances the survival of several bacterial species under environmental stress conditions imposed in water and soil, such as UV irradiation, salinity, thermal and oxidative sttess, desiccation, and osmotic shock. The ability to endure these sttesses is linked to a cascade of events concomitant with PHA degradation and the expression of genes involved in protection against... [Pg.39]

Yilmaz M, Soran H, Beyatli Y (2005) Determination of poly-P-hydroxybutyrate (PHB) production by some Bacillus spp. World J Microbiol Biotechnol 21 565-566 Zhao HY, Li HM, Qin LF, Wang HH, Chen G-Q (2007) Disruption of the polyhydroxyalkanoate synthase gene in Aeromonas hydrophila reduces its survival ability under stress conditions. FEMS Microbiol Lett 276 34-41... [Pg.62]

Abstract Polyhydroxyalkanoates (PHAs) are natural polyesters that accumulate in numerous microorganisms as a carbon- and energy-storage material under the nutrient-limiting condition in the presence of an excess carbon source. PHAs are considered to be one of the potential alternatives to petrochemically derived plastics owing to their versatile material properties. Over the past few decades, extensive detailed biochemical, molecular-biological, and metabolic studies related to PHA... [Pg.63]

Pozo C, Martlnez-Toledo MV, Rodelas B, Gonzales-Lopez J (2(X)2) Effects of culture conditions on the production of polyhydroxyalkanoates by Azotobacter chroococcum H23 in media containing a high concnetration of alpechin (wastewater from olive oil mills) as primary carbon source. J Biotechnol 97 125-131... [Pg.118]

Boiandin AN, Kalacheva GS, Rodicheva EK, Volova TG (2008) Synthesis of reserve polyhydroxyalkanoates by luminescent bacteria. Mikrotnologiia 77 364-369 Borah B, Thakur PS, Nigam JN (2002) The influence of nutritional and environmental conditions on the accumulation of poly-P-hydroxybutyrate in Bacillus mycoides RLJ B-017. J Appl Microbiol 92 776-783... [Pg.170]

Kellerhals MB, Kessler B, Witholt B (1999) Closed-loop control of bacterial high-ceU-density fed-batch cultures production of mcl-PHAs by Pseudomonas putida KT2442 under singlesubstrate and cofeeding conditions. Biotechnol Bioeng 65 306-315 Kessler B, Witholt B (2001) Factors involved in the regulatory network of polyhydroxyalkanoate metabolism. J Biotechnol 86 97-104... [Pg.175]

Lee HJ, Chd MH, Kim TU, Yoon SC (2001) Accumulation of polyhydroxyalkanoic acid containing large amounts of unsaturated monomers in Pseudomonas fluorescens BM07 utilizing saccharides and its inhibition by 2-bromooctanoic acid. Appl Environ Microbiol 67 4963-4974 Lee WH, Azizan MNM, Sudesh K (2004) Effects of culture conditions on the composition of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) synthesized by Comamonas acidovorans. Polym Degrad Stab 84 129-134... [Pg.177]

Zinn M, Witholt B, Egh T (2001) Occurrence, synthesis and medical application of bacterial polyhydroxyalkanoate. Adv Drug DeUv Rev 53 5-21 Zinn M, Hartmann R, Pletscher E, Geiger T, Witholt B, EgU T (2002) Tailored biosynthesis of polyhydroxyalkanoate under multiple-nutrient-Umited growth conditions Zinn M, Witholt B, Egli T (2004) Dual nutrient limited growth models, experimental observations, and applications. J Biotechnol 113 263-279... [Pg.236]

Polyhydroxyalkanoates (PHAs) represent an important group of biodegradable plastics. They are produced by various bacteria in many grades, differing in composition, molecular weight and other parameters [1, 2]. The formation of a particular material, either homo or copolymra depends on the type of bacteria, but even more important are the conditions of polymer formation, mainly the substrate used for feeding the bacteria and the conditions of their growth. [Pg.451]

Polyhydroxyalkanoates (PHAs) are a family of biodegradable polymers that have gained a fresh impetus in the recent years. PHAs are polyesters of 7 -hydroxyalkanoic acids produced by a wide variety of bacterial species, under nutrient-limiting conditions (Fig. 8.1). [Pg.257]

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Polyhydroxyalkanoate

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