Polyhydroxyalkanoates
Mostrando 13-24 de 60 artigos, teses e dissertações.
-
13. Volatile fatty acids influence on the structure of microbial communities producing PHAs
Polyhydroxyalkanoates (PHAs) can be produced by microorganisms and are a biodegradable alternative to fossil-fuel based plastics. Currently, the focus is on reducing production costs by exploring alternative substrates for PHAs production, and on producing copolymers which are less brittle than monomers. Accordingly, this study used a substrate consisting of
Braz. J. Microbiol.. Publicado em: 2014-06
-
14. Production of polyhydroxyalkanoates (PHAs) by Bacillus subtilis and Escherichia coli grown on cane molasses fortified with ethanol
The aim of this work was to study the production of polyhydroxyalkanoates (PHAs) by Bacillus subtilis and Escherichia coli isolated from the industrial contaminated soil samples using cane molasses as an inexpensive substrate. The amount of PHA accumulated followed a similar pattern to its growth for each of treatment indicating a growth-related production,
Braz. arch. biol. technol.. Publicado em: 2014-02
-
15. Produção e caracterização de polihidroxialcanoatos obtidos por fermentação da glicerina bruta residual do biodiesel
The aim of this study was to evaluate the production of polyhydroxyalkanoates (PHAs) by fermentation of Crude Glycerin, a byproduct of the biodiesel industry, by Cupriavidus necator IPT 026, 027 and 028. The influence of fermentation time and temperature in shake flasks were evaluated. The highest PHA production (2.82 g L-1) occurred at 35 ºC for 72 h of fe
Quím. Nova. Publicado em: 2014
-
16. Separation of polyhydroxyalkanoates-producing bacterial strains using PHA synthase gene and their evaluation for PHA deposition
In this study, a variety of samples were screened for the presence of PHA synthase gene. Results showed that 16 out of 102 isolated were positive for PHA respective genes. The highest prevalence was observed in Pseudomonas aeruginosa. The capability of PHA production was also shown by growing these strains on the defined medium and subsequent analysis using
Braz. arch. biol. technol.. Publicado em: 2013-08
-
17. 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
-
18. Bioprospecção de genes relacionados à biossíntese de polímeros biodegradáveis a partir de uma biblioteca metagenômica de solo de Mata Atlântica. / Bioprospecting in a metagenomic library from Atlantic forest soil for genes involved on the biosynthesis of biodegradable polymers.
O presente estudo teve como objetivo realizar a triagem de PHA sintases numa biblioteca metagenômica de solo de Mata Atlântica, empregando duas técnicas de busca: o método de detecção fenotípica e a técnica de PCR. Resultados positivos foram obtidos com este último, empregando iniciadores descritos na literatura e iniciadores descritos neste trabalh
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/11/2011
-
19. Isolamento de bactérias produtoras de polihidroxialcanoatos e caracterização molecular de sua PHA sintase. / Isolation of polyhydroxyalkanoates producing bacteria and molecular characterization of their PHA synthase.
A total of 1520 isolates from domestic sewage sludge or soil of preserved area were evaluated in regards of PHA production using the lipophilic Nile Red A or Sudan Black B dyes, allowing the detection of 261 isolates. PHA production experiments revealed P3HB producing isolates at higher amounts than the strain Burkholderia sacchari LFM101 and PHAMCL producti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/09/2011
-
20. 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
-
21. Production and characterization of PHA from recombinant E. coli harbouring phaC1 gene of indigenous Pseudomonas sp. LDC-5 using molasses
Polyhydroxyalkanoates (PHA) are biodegradable and biocompatible green thermoplastics, synthesized by wide variety of bacteria as an intracellular carbon and energy storage intermediate. They are used as an alternative to nonrenewable petroleum derived plastics. The current interest in these biopolyesters is stimulated by the search for cost-effective capital
Brazilian Journal of Microbiology. Publicado em: 2011-09
-
22. Production of biodegradable plastics using sugarcane bagasse hemicellulosic hydrolysate. / Produção de plásticos biodegradáveis utilizando hidrolisado hemicelulósico de bagaço de cana-de-açúcar.
The aim of this thesis is to produce poly3-hydroxybutyrate (P3HB) and poli-3-hidroxibutirate-co-3-hydroxyvalerate (PHB-co-3HV), biodegradable polymers, using hemicellulosic hydrolysate, rich in xylose, from sugarcane bagasse. Metabolic flux analysis in silico of xylose metabolism indicated that, though metabolism redirection is possible to increase P3HB yiel
Publicado em: 2010
-
23. Avaliação do potencial de Burkholderia sacchari produzir o copolimero biodegradável poli(3-hidroxibutirato-co-3-hidroxihexanoato) [P(3HB-co-3HHX)]. / Evaluating the potential of Burkholderia sacchari to produce the biodegradable copolymer poly (3-hydroxybutirate-co-3-hydroxyhexanoate).
The ability of B. sacchari to accumulate poly-3-hydroxybutyrate-co-3-hydroxyhexanoate (P3HB-co-3HHx) from glucose and hexanoic acid was confirmed. 3HHx content was up to 2 mol% of PHA (<10% of the maximum theoretical 3HHx from the acid), indicating a substrate flexibility of B. sacchari PHA synthase, but high efficiency of hexanoate catabolic pathways. Therm
Publicado em: 2010
-
24. Isolamento de bactéria produtoras de polihidroxialcanoatos de cadeia curta e média a partir de óleos vegetais / Isolation of bactéria producing polyhydroxyalkanoates containing short-chain-length and medium-chain-length monomers from plant oils
O potencial de bactérias em produzir polihidroxialcanoatos (PHA) a partir de óleo de soja foi avaliado com ênfase em Aeromonas spp. Dez isolados apresentando características de Aeromonas spp. (colônias amarelas em GSP agar e produção de P3HB-co-3HHx) e perfis ARDRA similares foram obtidos. Dois isolados produzindo PHAMCL foram também obtidos e experi
Publicado em: 2009