Results 181 to 190 of about 480,266 (218)
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Hydrolytic degradation of poly[(R)-3-hydroxybutyric acid] in the melt
Polymer, 2005Abstract Poly[(R)-3-hydroxybutyric acid] [R-P(3HB)] was hydrolyzed in high-temperature and high-pressure water at the temperature range of 180–300 °C and for a period of 360 min. The formation, racemization, and decomposition of 3-hydroxybutyric acids (3HBs) and molecular weight change of R-P(3HB) were investigated.
Takashi Saeki +4 more
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Clinica Chimica Acta, 1975
1. Urine and serum samples from patients with ketoacidosis of varying degree and etiology have been examined by gas chromatography and mass spectrometry. 2. In addition to 3-hydroxyisovaleric acid, relatively high concentrations of two analogous hydroxy acids, 3-hydroxyisobutyric acid and 2-methyl-3-hydroxybutyric acid, were found in the urine.
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1. Urine and serum samples from patients with ketoacidosis of varying degree and etiology have been examined by gas chromatography and mass spectrometry. 2. In addition to 3-hydroxyisovaleric acid, relatively high concentrations of two analogous hydroxy acids, 3-hydroxyisobutyric acid and 2-methyl-3-hydroxybutyric acid, were found in the urine.
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Biosynthesis of enantiopure (S)-3-hydroxybutyric acid in metabolically engineered Escherichia coli
Applied Microbiology and Biotechnology, 2008A biosynthetic pathway for the production of (S)-3-hydroxybutyric acid (S3HB) from glucose was established in recombinant Escherichia coli by introducing the beta-ketothiolase gene from Ralstonia eutropha H16, the (S)-3-hydroxybutyryl-CoA dehydrogenase gene from R.
Lee, SH +3 more
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Folia Microbiologica, 1998
Free-living nitrogen-fixing bacteria have been identified as a potential source of poly-3-hydroxybutyric acid (PHB). Systematic study of this ability of N(2)-fixing organisms has lead to the isolation of an efficient strain, identified asAzotobacter chroococcum.
S, Pal, A, Manna, A K, Paul
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Free-living nitrogen-fixing bacteria have been identified as a potential source of poly-3-hydroxybutyric acid (PHB). Systematic study of this ability of N(2)-fixing organisms has lead to the isolation of an efficient strain, identified asAzotobacter chroococcum.
S, Pal, A, Manna, A K, Paul
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Bioresource Technology, 2013
Enzymatic reduction of levulinic acid (LA) was performed for the synthesis of 4-hydroxyvaleric acid (4HV)--a monomer of bio-polyester and a precursor of bio-fuels--using 3-hydroxybutyrate dehydrogenase (3HBDH) from Alcaligenes faecalis. Due to the catalytic inactivity of the wild-type enzyme toward LA, engineering of the substrate specificity of the ...
Young Joo, Yeon +2 more
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Enzymatic reduction of levulinic acid (LA) was performed for the synthesis of 4-hydroxyvaleric acid (4HV)--a monomer of bio-polyester and a precursor of bio-fuels--using 3-hydroxybutyrate dehydrogenase (3HBDH) from Alcaligenes faecalis. Due to the catalytic inactivity of the wild-type enzyme toward LA, engineering of the substrate specificity of the ...
Young Joo, Yeon +2 more
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Bioresource Technology, 2011
Feasibility of producing (R)-3-hydroxybutyric acid ((R)-3-HB) using wild type Azohydromonas lata and its mutants (derived by UV mutation) was investigated. A. lata mutant (M5) produced 780 m g/l in the culture broth when sucrose was used as the carbon source.
Charles U, Ugwu +2 more
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Feasibility of producing (R)-3-hydroxybutyric acid ((R)-3-HB) using wild type Azohydromonas lata and its mutants (derived by UV mutation) was investigated. A. lata mutant (M5) produced 780 m g/l in the culture broth when sucrose was used as the carbon source.
Charles U, Ugwu +2 more
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Macromolecular Chemistry and Physics, 1996
AbstractThe extens of crystallization of poly(3‐hydroxybutyric acid) (P(3HB)) in blends of P(3HB) with stereoregular poly(vinyl alcohol) (PVA) have been studied by means of infared spectroscopy. The degree of crystallinity of P(3HB) was found to decrease by blending with atactic PVA when PVA was the predominant component of the blend.
Tetsuya Ikejima +2 more
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AbstractThe extens of crystallization of poly(3‐hydroxybutyric acid) (P(3HB)) in blends of P(3HB) with stereoregular poly(vinyl alcohol) (PVA) have been studied by means of infared spectroscopy. The degree of crystallinity of P(3HB) was found to decrease by blending with atactic PVA when PVA was the predominant component of the blend.
Tetsuya Ikejima +2 more
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Effect of Benzoic Acid on the Crystallization Behavior of Poly(3-Hydroxybutyrate)
Journal of Macromolecular Science, Part B, 2013The effect of benzoic acid (BA) on the crystallization behavior of poly(3-hydroxybut yrate; PHB) was studied.
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Syntheses and condensation polymerizations of 3‐hydroxybutyric acid derivatives of pyrimidine bases
Die Makromolekulare Chemie, 1978Abstract4‐(1,2,3,4‐Tetrahydro‐5‐methyl‐2,4‐dioxo‐1‐pyrimidinyl)‐3‐hydroxybutyric acid (1a) and 4‐(1,2,3,4‐tetrahydro‐2,4‐dioxo‐1‐pyrimidinyl)‐3‐hydroxybutyric acid (1b) were synthesized via the addition reaction of thymine (3) and 4‐ethoxy‐1,2‐dihydro‐2‐oxopyrimidine (7), respectively, to 1‐chloro‐2,3‐epoxypropane and subsequent cyanization, followed ...
Masahira Hattori +2 more
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Organocatalytic depolymerization of poly(3-hydroxybutyrate) to crotonic acid
Polymer Degradation and Stability, 2023Qingfu Zhang +5 more
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