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Showing 1 to 20 of 87 for “"Hydroxybutyrate"”.
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Dielectric relaxation behavior of poly(3-hydroxybutyrate)
The importance of Poly(3-hydroxybutyrate) (PHB) as a biodegradable material is well known. Due to ever increasing environmental awareness, significant efforts have been made to utilize PHB or its derivatives in producing disposable products. However, brittle mechanical properties of PHB hinder the …
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Improved production of poly(hydroxybutyrate) and related enzymes
… to address both of these problems, using polyhydroxybutyrate as a simple model. To simplify the purification of the polymer and to broaden the range of potential monomers, PHA can be produced in vitro. To achieve this on a commercial scale would require the production of large quantities of …
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Poly(3-Hydroxybutyrate), P(3HB) production and its biomedical applications
In this project enhancement of poly(3-hydroxybutyrate), P(3HB) production using a Gram positive bacteria, Bacillus cereus SPV and sucrose as the main carbon source was successfully achieved. Different modes of fermentation including shaken flask, batch, fedbatch and two-stage fermentation were …
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The degradation of gel-spun poly(beta-hydroxybutyrate) fibrous matrix
Poly(β-hydroxybutyrate), (PHB), is a biologically produced, biodegradable thennoplastic with commercial potential. In this work the qualitative and quantitative investigations of the structure and degradation of a previously unstudied, novel, fibrous form of PHB, were completed. This gel-spun PHB …
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Biosynthesis of Poly-3-Hydroxybutyrate and its Application in Controlled Drug Delivery
… of medical devices and drug delivery. Poly(3-hydroxybutyrate), P(3HB), is a short chain length variety of this polymer which has specifically been recognised for its potential to form DDS. In the first part of this study the solid-in-oil-in-water technique was used to optimise production of …
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Study of the miscibility, morphology, crystallization, and melting behavior of blends of poly(3-hydroxybutyrate) and poly(vinylidene fluoride)
… studies on poly(vinylidene fluoride)/poly(3-hydroxybutyrate) (PVDF/PHB) blends prepared by melt and solution blending techniques. The blends exhibit - a single, composition dependent Tg. Dynamic crystallization studies indicate that PVDF crystallizes first in all blends containing more than …
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An examination of biological phosphorus removal using bacterial counting and poly-β-hydroxybutyrate analysis in batch and continuous flow systems
… utilization was examined using PHB (Poly-β -Hydroxybutyrate - an internal substrate storage product) analysis by gas chromatography to supplement COD and acetate measurements. The results showed that Poly-P bacterial counts were significantly greater at a 5 day sludge age compared to a 10 day …
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The Effect of The Modification of The Acidic and Zwitterionic Phospholipid Composition on The Enzymatic Activity of D-Beta-Hydroxybutyrate Dehydrogenase
… composition on the enzymatic activity of D-beta-hydroxybutyrate dehydrogenase (BDH) was examined. Phospholipase D was used to increase the acidic phospholipid composition. This enzyme hydrolyzed primarily zwitterionic phospholipids to phosphatidic acid, an acidic phospholipid. The accumulation of …
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Quroum sensing disruption and the use of short-chain fatty acids and polyhydroxyalkanoates to control luminescent vibriosis
… the homopolymer of the short-chain fatty acid β-hydroxybutyrate, the well-known bacterial storage compound poly-β-hydroxybutyrate, was shown to offer a more efficient protection. Finally, it was shown that poly-β-hydroxybutyrate containing bacteria can be used to protect brine shrimp from …
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The Association Between Non-Esterified Fatty Acids And Beta-Hydroxybutyrate During The Transition Period In Holstein Dairy Cows And Negative Downstream Outcomes - Disease Incidence, Milk Production And Reproduction
… Non-esterified fatty acids (NEFA) and betahydroxybutyrate (BHBA) are measurable blood metabolites used to estimate the level of NEB. The objectives of herein were to: 1) identify critical concentrations of NEFA and BHBA above which the development of diseases were more likely; 2) describe …
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Blends of Biodegradable Thermoplastics With Lignin Esters
… were cellulose acetate butyrate (CAB), poly-hydroxybutyrate (PHB), poly-hydroxybutyrate-co-valerate (PHBV), and a starch-caprolactone blend (SCL). Lignin esters included acetate (LA), butyrate (LB), hexanoate (LH), and laurate (LL). Blend characteristics were analyzed in terms of thermal and …
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Metabolism in vivo of 1, 3-butanediol in the rat
… specific activities of urinary BD and S -hydroxybutyrate were 0.91 and 0.50 respectively. Polarimetry of both purified urinary BD and S -hydroxybutyrate showed that the percentages of (+)- and (-)-isomers of both compounds were 40 and 60% respectively. The metabolism in vitro of BD-3-c14 …
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Lateral organization and dynamics of phospholipids in membrane
… another integral membrane protein, D-$\beta$-hydroxybutyrate dehydrogenase (BDH), reorganized the phospholipids in the bilayer into a nonrandom distribution. Although the enzyme has a specific requirement for phosphatidylcholine for activity, the extent of energy transfer decreased in the …
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Evaluation of Negative Energy and Mineral Balance in Periparturient Holstein-Friesian Cattle
… for measuring blood and plasma glucose, β-hydroxybutyrate, and potassium concentration. The first study, presented in chapter three, evaluated the accuracy of an electrochemical point-of-care meter for measuring blood and plasma glucose concentration in dairy cattle, and characterized the …
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Substrate metabolism and acid secretion in the rat stomach
… across the rat stomach in vivo. Glucose, D-3-hydroxybutyrate and branched-chain amino acids were taken up by the stomach wall under control and acid-secreting (pentagastrin-stimulated) conditions. The pattern of substrate metabolism appeared unaffected by stimulation of acid secretion...
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Biosynthesis and characterisation of polyhydroxyalkanoate biopolymers and their oligomers for circular economy
… the polymer produced with LDPE and PE-T to be 3-hydroxybutyrate, 3-hydroxyvalerate and 3-hydroxyhexanoate and that with [text redacted] to be 3-hydroxybutyrate and 3-hydroxyvalerate. Chloroform solvent extraction and soap digestion were also compared to determine the most cost-effective, …
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Estudo citoquímico de enzimas mitocondriais de Trypanosoma cruzi em culturas de tecido
… Glycerophosphate Dehydrogenase (E.C. 1.1.2.1), b Hydroxybutyrate Dehydrogenase (E.C. 1.1.1.30) and NADPH Tetrazolium Redutase. Light microscopy showed an intense reaction. Blue granules (NBT salt) were seen within the cytoplasm of the cells in the region of the nucleus. In parasitized cells they …
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