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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova T.G., Kalacheva G.S., Steinbuchel A...
Заглавие : Biosynthesis of multi-component polyhydroxyalkanoates by the bacterium Wautersia eutropha
Место публикации : Macromol. Symp.: WILEY-V C H VERLAG GMBH, 2008. - Vol. 269: 4th European Symposium on Biopolymers (OCT 02-04, 2007, Kusadasi, TURKEY). - С. 1-7. - 7. - ISSN 1022-1360, DOI 10.1002/masy.200850901
Примечания : Cited References: 20
Предметные рубрики: RALSTONIA-EUTROPHA
ALCALIGENES-EUTROPHUS
AEROMONAS-HYDROPHILA
ENHANCED PRODUCTION
PHA SYNTHASE
COPOLYESTERS
POLY(3-HYDROXYBUTYRATE-CO-3-HYDROXYHEXANOATE)
3-HYDROXYBUTYRATE
ACID
Ключевые слова (''Своб.индексиров.''): autotrophic and mixotrophic growth--multi-component polyhydroxyalkanoates--wautersia eutropha
Аннотация: The study addresses the effect of different conditions of carbon nutrition on synthesis of polyhydroxyalkanoates by the bacterium Wautersia eutropha. In experiments with two wild type strains (H16 and 85786), it has been first found that under mixotrophic growth conditions -CO2+ co-substrate (alkanoic acids) - bacteria can synthesize multi-component PHAs, consisting of short- and medium-chain-length monomers with carbon chains containing 4 to 8 atoms. It has been shown that PHA composition is determined by the type of the co-substrate. Fatty acids with odd number of carbons induce bacteria to synthesize four- and five-component PHAs with hydroxybutyrate, hydroxyvalerate as major monomers and hydroxyhexanoate, hydroxyheptanoate and hydroxyoctanoate as minor, occasionally occurring, ones. Fatty acids with even number of carbons induce synthesis of not only their respective monomers (hydroxyhexanoate and hydroxyoctanoate) but also hydroxyvalerate, making possible synthesis of four-component PHAs, containing hydroxybutyrate and hydroxyhexanoate as major components (up to 18 mol%). A family of short- and medium-chain-length four- and five-component PHAs were synthesized and their physicochemical properties examined.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova T.G., Kalacheva G.S., Altukhova O.V.
Заглавие : Autotrophic synthesis of polyhydroxyalkanoates by the bacteria Ralstonia eutropha in the presence of carbon monoxide
Колич.характеристики :4 с
Место публикации : Appl. Microbiol. Biotechnol.: SPRINGER-VERLAG, 2002. - Vol. 58, Is. 5. - P675-678. - ISSN 0175-7598, DOI 10.1007/s00253-002-0941-8
Примечания : Cited References: 35
Предметные рубрики: PSEUDOMONAS-OLEOVORANS
ALCALIGENES-EUTROPHUS
COAL
CULTIVATION
METABOLISM
SUBSTRATE
CULTURE
CO2
H-2
O-2
Аннотация: It has been found that the carbon monoxide (CO)-resistant strain of the hydrogen bacteria Ralstonia eutropha B5786 is able to synthesise polyhydroxyalkanoates (PHAs) in the presence of CO under autotrophic conditions. This strain, grown on model gas mixtures containing 5-25% CO v/v), accumulates up to 70-75% (of absolutely dry matter) PHA, without significant variation in the yield coefficient on hydrogen. No suppression of the activities of the key enzymes of PHA synthesis (beta-ketothiolase, acetoacetyl-CoA-reductase, butyrate dehydrogenase and poly-3-hydroxybutyrate synthase) was recorded. The PHA synthesised is a copolymer containing mostly beta-hydroxybutyrate (more than 99 mol%) with trace amounts of beta-hydroxyvalerate. The investigated properties of the polymer (molecular weight, crystallinity, temperature characteristics) do not differ from those of the polymer synthesised on electrolytic hydrogen.
WOS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova, Tatiana G., Prudnikova, Svetlana V., Vinogradova, Olga N., Syrvacheva, Darya A., Shishatskaya, Ekaterina I.
Заглавие : Microbial Degradation of Polyhydroxyalkanoates with Different Chemical Compositions and Their Biodegradability
Колич.характеристики :15 с
Коллективы : Russian Science Foundation [14-26-00039]
Место публикации : Microb. Ecol.: SPRINGER, 2017. - Vol. 73, Is. 2. - С. 353-367. - ISSN 0095-3628, DOI 10.1007/s00248-016-0852-3. - ISSN 1432-184X(eISSN)
Примечания : Cited References:65. - This study was supported by the Russian Science Foundation (Grant No. 14-26-00039).
Предметные рубрики: TROPICAL COASTAL WATERS
PHA-DEGRADING BACTERIA
ALCALIGENES-EUTROPHUS
Ключевые слова (''Своб.индексиров.''): degradable polyhydroxyalkanoates--pha--soil--pha-degrading--microorganisms
Аннотация: The study addresses degradation of polyhydroxyalkanoates (PHA) with different chemical compositions-the polymer of 3-hydroxybutyric acid [P(3HB)] and copolymers of P(3HB) with 3-hydroxyvalerate [P(3HB/3HV)], 4-hydroxybutyrate [P(3HB/4HB)], and 3-hydroxyhexanoate [P(3HB/3HHx)] (10-12 mol%)-in the agro-transformed field soil of the temperate zone. Based on their degradation rates at 21 and 28 A degrees C, polymers can be ranked as follows: P(3HB/4HB) P(3HB/3HHx) P(3HB/3HV) P(3HB). The microbial community on the surface of the polymers differs from the microbial community of the soil with PHA specimens in the composition and percentages of species. Thirty-five isolates of bacteria of 16 genera were identified as PHA degraders by the clear zone technique, and each of the PHA had both specific and common degraders. P(3HB) was degraded by bacteria of the genera Mitsuaria, Chitinophaga, and Acidovorax, which were not among the degraders of the three other PHA types. Roseateles depolymerans, Streptomyces gardneri, and Cupriavidus sp. were specific degraders of P(3HB/4HB). Roseomonas massiliae and Delftia acidovorans degraded P(3HB/3HV), and Pseudoxanthomonas sp., Pseudomonas fluorescens, Ensifer adhaerens, and Bacillus pumilus were specific P(3HB/3HHx) degraders. All four PHA types were degraded by Streptomyces.
WOS,
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