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    The physicochemical properties of polyhydroxyalkanoates with different chemical structures / T. G. Volova [et al.] // Polym. Sci. Ser. A. - 2013. - Vol. 55, Is. 7. - P. 427-437, DOI 10.1134/S0965545X13070080. - Cited References: 41 . - 11. - ISSN 0965-545X
   Перевод заглавия: Физико-химические свойства полигидроксиалканоатов с разной химической структурой

РУБ Polymer Science
Рубрики:
MICROBIAL SYNTHESIS
   RALSTONIA-EUTROPHA
   COMAMONAS-ACIDOVORANS
   AEROMONAS-HYDROPHILA
   POLY(3-HYDROXYBUTYRATE-CO-4-HYDROXYBUTYRATE)
   BIOSYNTHESIS
   COPOLYMERS
   POLY(3-HYDROXYBUTYRATE-CO-3-HYDROXYHEXANOATE)
   POLYMERS
Аннотация: A set of polyhydroxyalkanoates are synthesized, and a comparative study of their physicochemical properties is performed. The molecular masses and polydispersities of polyhydroxyalkanoates are found to be independent of their chemical structures. It is shown that the temperature characteristics and degrees of crystallinity of polyhydroxyalkanoates are affected by the chemical compositions of the monomers and their quantitative contents in the polymers. The incorporation of 4-hydroxybutyrate, 3-hydroxyvalerate, and 3-hydroxyhexanoate units into the chain of poly(3-hydroxybutyrate) decreases its melting point and thermal degradation temperature relative to these parameters of a homogeneous poly(3-hydroxybutyrate) sample (175 +/- 5A degrees C and 275 +/- 5A degrees C, respectively). The higher the content of the second monomer units in the poly(3-hydroxybutirate) chain, the greater the changes. The degrees of crystallinity of polyhydroxyalkanoate copolymers are generally lower than that of poly(3-hydroxybutyrate) (75 +/- 5%). The effect on the ratio of the amorphous and crystalline phases of the copolymer samples becomes more pronounced in the series 3-hydroxy-valerate-3-hydroxyhexanoate-4-hydroxybutyrate. The prepared samples exhibit different properties ranging from rigid thermoplastic materials to engineering elastomers.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Inst Fundamental Biol & Biotechnol, Krasnoyarsk 660041, Russia
Siberian State Technol Univ, Krasnoyarsk 660049, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
MIT, Cambridge, MA 02139 USA;

Доп.точки доступа:
Volova, T. G.; Волова, Татьяна Григорьевна; Zhila, N. O.; Жила, Наталья Олеговна; Shishatskaya, E. I.; Шишацкая, Екатерина Игоревна; Mironov, P. V.; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Sukovatyi, A. G.; Суковатый, Алексей Григорьевич; Sinskey, A. J.
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Structural investigation of biogenic ferrihydrite nanoparticles dispersion / M. . Balasoiu [et al.] // Optoelectron. Adv. Mater.-Rapid Commun. - 2010. - Vol. 4, Is. 12. - P. 2136-2139. - Cited References: 21. - The financial support from the Grants No.224 it.7 and No.56 it.5 of the Romanian Governmental Plenipotentiary at JINR and the support from the JINR theme No. 04-4-1069-2009/2011 are acknowledged. S.S. Abramchyuk (Advanced Technologies Center, Moscow) for the HRTEM images is acknowledged. . - ISSN 1842-6573

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
S-LAYER PROTEINS
   METAL NANOPARTICLES
   BIOLOGICAL SYNTHESIS
   BIOSYNTHESIS
   MICROORGANISMS
   FUNGI
Кл.слова (ненормированные):
Bacterial nanoparticles -- Ferrihydrite -- Small angle X-ray scattering -- High-resolution electron microscopy
Аннотация: Structural properties of biogenic ferrihydrite nanoparticles produced by bacteria Klebsiella oxytoca are investigated. Investigations of morphology and size of particles dispersed in water by means of high-resolution transmission electron microscopy and small angle X-ray scattering measurements were performed. By model calculations followed by fitting procedure the structural parameters of a cylinder of radius R = 4.87 +/- 0.02 nm and height L = 2.12 +/- 0.04 nm are obtained.

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Держатели документа:
[Balasoiu, M.
Kuklin, A. I.
Soloviov, D. V.
Arzumanian, G. M.] Joint Inst Nucl Res, Dubna 141980, Russia
[Ischenko, L. A.
Stolyar, S. V.
Iskhakov, R. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Raikher, Y. L.] RAS, Ural Branch, Inst Continuum Media Mech, Perm 614013, Russia
[Kurkin, T. S.] RAS, Inst Synthet Polymer Mat, Moscow 117393, Russia
[Balasoiu, M.
Aranghel, D.] Natl Inst Phys & Nucl Engn, Bucharest, Romania
[Stolyar, S. V.
Iskhakov, R. S.] RAS, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Balasoiu, M.; Ischenko, L. A.; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Raikher, Y. L.; Kuklin, A. I.; Soloviov, D. V.; Kurkin, T. S.; Aranghel, D.; Arzumanian, G. M.
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