Abstract The effects of NaCl, Na 2 SO 4 , HPO and 3 C 6 H 5 O 7 on the production 3-hydroxybutyrate, polyhydroxybutyrate, by-products by Burkholderia cepacia . Proper addition can significantly promote 3-hydroxybutyric acid polyhydroxybutyrate. concentration, productivity, yield 3-hydroxybutyrate were increased 48.2%, 55.6%, 48.3% at 16 mM increases 80.1%, 47.1%, 80.0% in polyhydroxybutyrate ob...

Polyhydroxybutyrate-chitosan-hydroxyapatite (PHB-CHT-HAP) composite scaffolds were prepared by the precipitation of biopolymer-nanohydroxyapatite suspensions and following lyophilisation. The propylene carbonate and acetic acid were used as the polyhydroxybutyrate and chitosan solvents, respectively. The high porous microstructure was observed in composites and the macroporosity of scaffolds (p...

Rhizobium leguminosarum synthesizes polyhydroxybutyrate and glycogen as its main carbon storage compounds. To examine the role of these compounds in bacteroid development and in symbiotic efficiency, single and double mutants of R. leguminosarum bv. viciae were made which lack polyhydroxybutyrate synthase (phaC), glycogen synthase (glgA), or both. For comparison, a single phaC mutant also was i...

microbial cells are producers of natural polymers present in plant cells. production of pullulan (an extracellular microbial polysaccharide) by aureobasidium pullularia pullulans (p. pullulans) was studied under fermentation conditions, and kinetic parameters were determined. pullulan formation obeyed a growth and non-growth associated term. phb (polyhydroxybutyrates) an intracellular biopolyme...

Preparation of nanoparticles is one the important ways to increase biological effectiveness materials. There are several methods prepare polyhydroxybutyrate (PHB) nanoparticles. Here, a new method used based on exposing PHB ultrasound waves under variable pH conditions. In present study, was added distilled water and adjusted 4 by HCl (1 N). The suspension exposed at 4500 kh for 25 seconds. The...

The culturability of Escherichia coli, Ralstonia eutropha and Bacillus subtilis after incubation in phosphate-buffered saline at either 5°C or 30°C was determined. The culturability of B. subtilis showed little dependence on temperature. The culturability of E. coli rapidly decreased at 30°C but remained almost constant at 5°C. In contrast, the culturability of R. eutropha decreased by three or...

At the time of its first publication, halomucin from Haloquadratum walsbyi strain HBSQ001 was the largest archaeal protein known (9159 aa). It has a predicted signal sequence, making it likely to be an extracellular or secreted protein. Best BLAST matches were found to be mammalian mucins that protect tissues to dehydration and chemical stress. It was hypothesized that halomucin participates in...