Polyhydroxybutyrate
Mostrando 13-24 de 51 artigos, teses e dissertações.
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13. Triagem de suportes orgânicos e protocolos de ativação na imobilização e estabilização de lipase de Thermomyces lanuginosus
Lipase from Thermomyces lanuginosus was covalently immobilized on activated poly-hydroxybutyrate, sugarcane bagasse and the chemically modified hybrid hydrogel chitosan-alginate prepared by different strategies. Among the tested supports, chitosan-alginate chemically modified with 2,4,6-trinitrobenzenesulfonic acid rendered derivatives with the highest hydro
Quím. Nova. Publicado em: 2013
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14. Agro-industrial residues and starch for growth and co-production of polyhydroxyalkanoate copolymer and α-amylase by Bacillus sp. CFR-67
Polyhydroxyalkanoates (PHA) and α-amylase (α-1,4 glucan-4-glucanohydrolase, E.C. 3.2.1.1) were co-produced by Bacillus sp. CFR-67 using unhydrolysed corn starch as a substrate. Bacterial growth and polymer production were enhanced with the supplementation of hydrolysates of wheat bran (WBH) or rice bran (RBH) individually or in combination (5-20 g L-1, bas
Braz. J. Microbiol.. Publicado em: 2012-09
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15. Tratamentos de fibras de carnaúba [copernicia prunífera (miller) h. e. moore] para o desenvolvimento de compósito biodegradável com matriz de polihidroxibutirato
O uso de matérias-primas de fontes renováveis para a produção de materiais vem sendo objeto de diversos estudos e pesquisas, devido ao seu potencial na substituição de derivados petroquímicos. A adição de fibras vegetais a polímeros representa uma alternativa na substituição parcial ou total de fibras de vidro em compósitos. Neste trabalho, fibr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/06/2011
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16. New PHA products using unrelated carbon sources
Polyhydroxyalkanoates (PHA) are natural polyesters stored by a wide range of bacteria as carbon source reserve. Due to its chemical characteristics and biodegradability PHA can be used in chemical, medical and pharmaceutical industry for many human purposes. Over the past years, few Burkholderia species have become known for production of PHA. Aside from tha
Braz. J. Microbiol.. Publicado em: 2011-12
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17. Do engenho à biorrefinaria: a usina de açúcar como empreendimento industrial para a geração de produtos bioquímicos e biocombustíveis
A sugar cane mill is at the present moment a modest biorefinery producing few products such as sugar, ethanol and polyhydroxybutyrate (PHB). In the near future, this mill can expand its production using several renewable feedstock's to produce biofuels and high value biobased chemicals. However, the choice of appropriate products for addition to the portfoli
Química Nova. Publicado em: 2011
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18. Uso de tubete e de minitubete de compósito de polihidroxibutirato mais pó de madeira na produção e no plantio de mudas seminais e clonais de eucalipto / Use of tubes and minitubes of polyhydroxybutyrate plus wood powder composite in the production and planting of eucalyptus seedlings and cuttings
O início do uso de tubete na década de 80 revolucionou os viveiros, e hoje mesmo apresentando desvantagens, é amplamente difundido em todo o setor florestal. Esses tubetes de polipropileno, derivado do petróleo, possuem dois problemas: uso de fonte não renovável e resíduos para descarte. Uma alternativa é a substituição por plásticos biodegradáve
Publicado em: 2011
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19. Biocompatibility, osteointegration, osteoconduction, and biodegradation of a hydroxyapatite-polyhydroxybutyrate composite
A biocompatibilidade, osteointegração, osteocondução e biodegradação de um novo compósito de hidroxiapatita e polihidroxibutirato foram avaliados. O compósito foi implantado em defeitos ósseos em coelhos e dados clínicos, radiográficos, histológicos e histomorfométricos foram comparados aos de defeitos não preenchidos aos 8, 45 e 90 dias após
Brazilian Archives of Biology and Technology. Publicado em: 2010-08
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20. Blendas de PHB e seus copolímeros: miscibilidade e compatibilidade
Poly(hydroxybutyrate) and its copolymers are linear polyesters behaving as conventional thermoplastic materials. However, they are totally biodegradable and produced by a wide variety of bacteria from renewable sources. Some properties and high production cost are still preventing future applications. In an attempt to improve the properties and to reduce cos
Química Nova. Publicado em: 2010
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21. Thermal, mechanical and morphological properties of poly (hydroxybutyrate) and polypropylene blends after processing
The ever increasing accumulation of plastic waste in the environment has motivated research on polymers that degrade rapidly after being discarded as possible substitutes for conventional inert plastics. Biodegradable polymers can be an alternative, since they have non-toxic residual products and low environmental permanence. Poly (hydroxybutyrate) is a biod
Materials Research. Publicado em: 2009-06
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22. Polyhydroxybutyrate production using agro-industrial residue as substrate by Bacillus sphaericus NCIM 5149
The aim of this work was to study the production of polyhydroxybutyrate (PHB) using agro- industrial residues as the carbon source. Seven substrates, viz., wheat bran, potato starch, sesame oil cake, groundnut oil cake, cassava powder, jackfruit seed powder and corn flour were hydrolyzed using commercial enzymes and the hydrolyzates assessed for selecting th
Brazilian Archives of Biology and Technology. Publicado em: 2009-02
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23. Fluidodinamica e secagem do polihidroxibutirato (PHB) em leito fluidizado pulsado rotativo / Fluid dynamic and drying of the poly-hydroxybutyrate (PHB) in rotating-pulsed fluidized bed
Poly-hydroxybutyrate (PHB) is polyester, completely biodegradable and biocompatible. The interest on its development, production and commercialization has arisen due to its biodegradability and production integrated to the sugar and alcohol chain. Drying is an important step of the PHB production because an adequate post-processing is achieved only at moistu
Publicado em: 2009
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24. Caracterização fenotípica e produção de biopolímeros por bactérias isoladas de nódulos de guandu [(Cajanus cajan (L.) Millsp.]. 2009, 166f. / Phenotypic characterization and biopolymers production by bacteria isolated from pigeonpea [Cajanus cajan (L.) Millsp.] root nodules. Seropédica: UFRRJ, 2008. 166p.
The biological nitrogen fixation (BNF) is a natural process carried out by prokaryotes collectively called diazotrophs. Among the diverse microorganisms able to fix the atmospheric nitrogen, stand out those capable of set up mutualistic associations with legume plants in specialized structures called nodules. Thus the search for microorganisms able to establ
Publicado em: 2009