نتایج جستجو برای: hydroxybutyrate phb

تعداد نتایج: 4992  

Journal: :jundishapur journal of microbiology 0
akram hoseinabadi department of biology, shahed university, tehran, ir iran iraj rasooli department of biology, shahed university, tehran, ir iran; department of biology, shahed university, tehran, ir iran. tel: +98-2151212200, fax: +98-2151212201 mojtaba taran department of biology, razi university, kermanshah, ir iran

conclusions the results suggest that b. coagulans is a good candidate for the fermentative production of phb. background biodegradable polyesters are candidates for the development of environmental friendly plastics. poly-β-hydroxybutyrate (phb) is a type of polyester from the hydroxyalkanoates family, synthesized by bacteria as an intracellular material and accumulated as granules in the cytop...

Journal: :Journal of bacteriology 2004
René Handrick Simone Reinhardt Philipp Kimmig Dieter Jendrossek

Rhodospirillum rubrum possesses a putative intracellular poly(3-hydroxybutyrate) (PHB) depolymerase system consisting of a soluble PHB depolymerase, a heat-stable activator, and a 3-hydroxybutyrate dimer hydrolase (J. M. Merrick and M. Doudoroff, J. Bacteriol. 88:60-71, 1964). In this study we reinvestigated the soluble R. rubrum PHB depolymerase (PhaZ1). It turned out that PhaZ1 is a novel typ...

Journal: :Journal of bacteriology 2000
R Handrick S Reinhardt D Jendrossek

Ralstonia eutropha H16 degraded (mobilized) previously accumulated poly(3-hydroxybutyrate) (PHB) in the absence of an exogenous carbon source and used the degradation products for growth and survival. Isolated native PHB granules of mobilized R. eutropha cells released 3-hydroxybutyrate (3HB) at a threefold higher rate than did control granules of nonmobilized bacteria. No 3HB was released by n...

Journal: :علوم و تکنولوژی پلیمر 0
زهرا بیگم مختاری حسینی ابراهیم واشقانی فراهانی سید عباس شجاع الساداتی

poly-β-hydroxybutyrate (phb), produced by several species of bacteria, has attracted great attention as a biodegradable and biocompatible compound with almost similar properties of polypropylene. unfortunately, its use is currently limited due to high production costs. one of the most common methods for overcoming this constraint is the use of inexpensive substrates, like methanol. another stra...

Journal: :Microbial Cell Factories 2009
Qian Wang Hongmin Yu Yongzhen Xia Zhen Kang Qingsheng Qi

BACKGROUND Poly-beta-hydroxybutyrate (PHB) mobilization in bacteria has been proposed as a mechanism that can benefit their host for survival under stress conditions. Here we reported for the first time that a stress-induced system enabled E. coli, a non-PHB producer, to mobilize PHB in vivo by mimicking natural PHB accumulation bacteria. RESULTS The successful expression of PHB biosynthesis ...

2015
Akram Hoseinabadi Iraj Rasooli Mojtaba Taran

BACKGROUND Biodegradable polyesters are candidates for the development of environmental friendly plastics. Poly-β-hydroxybutyrate (PHB) is a type of polyester from the hydroxyalkanoates family, synthesized by bacteria as an intracellular material and accumulated as granules in the cytoplasm. OBJECTIVES The aim of this study was to isolate Poly β-hydroxybutyrate over producing bacteria and opt...

2013
Anton Bonartsev Sergey Yakovlev Arasha Boskhomdzhiev Irina Zharkova Dmitrii Bagrov Vera Myshkina Tatiana Mahina Elena Kharitonova Olga Samsonova Anton Zernov Vsevolod Zhuikov Yurii Efremov Vera Voinova Garina Bonartseva Konstantin Shaitan

The copolymerization of poly(3-hydroxybutyrate) (PHB) is a promising trend in bioengineering to improve biomedical properties, e.g. biocompatibility, of this biodegradable polymer. We used strain Azotobacter chroococcum 7B, an effective producer of PHB, for biosynthesis of not only homopolymer and its main copolymer, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHB-HV), but also novel terpolym...

2014
J. G. Fernandes D. M. Correia G. Botelho J. Padrão F. Dourado C. Ribeiro S. Lanceros-Méndez V. Sencadas

Fiber meshes of poly(hydroxybutyrate) (PHB) and poly(hydroxybutyrate)/ poly(ethylene oxide) (PHB/PEO) with different concentrations of chlorhexidine (CHX) were prepared by electrospinning, for assessment as a polymer based drug delivery system. The electrospun fibers were characterized at morphological, molecular and mechanical levels. The bactericidal potential of PHB and PHB/PEO electrospun f...

In the current study, the effect of dietary supplementation of poly-β-hydroxybutyrate (PHB) on growth performance, digestive enzymes activity, body composition, non-specific immune response and diseases resistance of rainbow trout fingerlings were investigated. Five hundred and fifty-two healthy fingerlings (8.2±1.0 g) were randomly distributed in 12 tanks (150 L) at a density of 46 fish/ tank ...

2016
Stanislav Obruca Petr Sedlacek Vladislav Krzyzanek Filip Mravec Kamila Hrubanova Ota Samek Dan Kucera Pavla Benesova Ivana Marova

Accumulation of polyhydroxybutyrate (PHB) seems to be a common metabolic strategy adopted by many bacteria to cope with cold environments. This work aimed at evaluating and understanding the cryoprotective effect of PHB. At first a monomer of PHB, 3-hydroxybutyrate, was identified as a potent cryoprotectant capable of protecting model enzyme (lipase), yeast (Saccharomyces cerevisiae) and bacter...

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