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Hydroxybutyrate

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https://www.readbyqxmd.com/read/29342118/microbial-degradation-behavior-in-seawater-of-polyester-blends-containing-poly-3-hydroxybutyrate-co-3-hydroxyhexanoate-phbhhx
#1
Hitoshi Sashiwa, Ryuji Fukuda, Tetsuo Okura, Shunsuke Sato, Atsuyoshi Nakayama
The microbial degradation behavior of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) and its compound with several polyesters such as poly(butylene adipate-co-telephtharate) (PBAT), poly(butylene succinate) (PBS), and polylactic acid (PLA) in seawater was tested by a biological oxygen demand (BOD) method. PHBHHx showed excellent biodegradation in seawater in this study. In addition, the biodegradation rate of several blends was much influenced by the weight ratio of PHBHHx in their blends and decreased in accordance with the decrement of PHBHHX ratio...
January 17, 2018: Marine Drugs
https://www.readbyqxmd.com/read/29341404/intra-and-inter-subject-variability-for-increases-in-serum-ketone-bodies-in-patients-with-type-2-diabetes-treated-with-the-sodium-glucose-co-transporter-2-inhibitor-canagliflozin
#2
David Polidori, Hiroaki Iijima, Maki Goda, Nobuko Maruyama, Nobuya Inagaki, Peter A Crawford
SGLT2 inhibitors have been associated with increased serum ketone bodies in patients with type 2 diabetes mellitus (T2DM). This analysis evaluated serum ketone body levels and variability in 1,278 Japanese patients with T2DM treated with canagliflozin 100 or 200 mg. Similar mean increases in ketone body concentrations of ~2-fold were seen with both canagliflozin doses. Median (interquartile range) percent change from baseline was 62% (0;180) for acetoacetate and 78% (2;236) for β-hydroxybutyrate. Approximately 2/3 of the variability in each ketone measure was attributed to intra-subject variability...
January 17, 2018: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/29340167/subcutaneous-glucagon-infusion-and-continuous-glucose-monitoring-enable-effective-management-of-hypoglycemia-in-a-patient-with-igf-2-producing-hemangiopericytoma
#3
Eric D Buras, Emily Weatherup, Jennifer Wyckoff
Background: Ectopic insulin-like growth factor (IGF)-2 production is a rare complication of an array of epithelial and mesenchymal tumors, and can clinically manifest as life-threatening hypoglycemia. Case presentation: A 49-year-old woman with 13-year history of metastatic hemangiopericytoma, previously treated with multiple rounds of chemotherapy and palliative radiation, presented to the emergency department after a hypoglycemic seizure. On arrival, glucose was 18 mg/dL (1...
2018: Clinical Diabetes and Endocrinology
https://www.readbyqxmd.com/read/29338584/effect-of-acute-ingestion-of-%C3%AE-hydroxybutyrate-salts-on-the-response-to-graded-exercise-in-trained-cyclists
#4
Mark Evans, Ella Patchett, Rickard Nally, Rachel Kearns, Matthew Larney, Brendan Egan
Acute ingestion of ketone salts induces nutritional ketosis by elevating β-hydroxybutyrate (βHB), but few studies have examined the metabolic effects of ingestion prior to exercise. Nineteen trained cyclists (12 male, 7 female) undertook graded exercise (8 min each at ∼30%, 40%, 50%, 60%, 70%, and 80% VO2peak) on a cycle ergometer on two occasions separated by either 7 or 14 days. Trials included ingestion of boluses of either (i) plain water (3.8 mL kg body mass-1) (CON) or (ii) βHB salts (0.38 g kg body mass-1) in plain water (3...
January 16, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29337429/co-expression-of-orfcma-with-phb-depolymerase-phazcma-in-escherichia-coli-induces-efficient-whole-cell-biodegradation-of-polyesters
#5
Ming-Chieh Lee, En-Jung Liu, Cheng-Han Yang, Li-Jung Hsiao, Tzong-Ming Wu, Si-Yu Li
Whole-cell degradation of polyesters not only avoids the tedious process of enzyme separation, but also allows the degraded product to be reused as a carbon source. In this study, Escherichia coli BL21(DE3) harboring phaZCma , a gene encoding poly(3-hydroxybutyrate) (PHB) depolymerase from Caldimonas manganoxidans, was constructed. The extra-cellular fraction of E. coli/pPHAZ exhibited a fast PHB degradation rate where it only took 35 h to completely degrade PHB films, while C. manganoxidans took 81 h to do the same...
January 16, 2018: Biotechnology Journal
https://www.readbyqxmd.com/read/29334654/phbv-polymer-supported-denitrification-system-efficiently-treated-high-nitrate-concentration-wastewater-denitrification-performance-microbial-community-structure-evolution-and-key-denitrifying-bacteria
#6
Zhongshuo Xu, Liyan Song, Xiaohu Dai, Xiaoli Chai
Biodegradable polymer supported denitrification (BPD) system shows good denitrification performance for the wastewater with low nitrate concentrations. In this study, a BPD system using Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) polymer as carbon source was developed to treat the wastewater with high nitrate concentrations. The denitrification performance, utilization ratio of PHBV polymers, and microbial community structure evolution and key denitrifying bacteria were comprehensively studied. Results indicated that an average nitrate removal efficiency of 99% could be achieved with an influent NO3--N concentration of 100 mg L-1 and a hydraulic retention time (HRT) of 7...
January 8, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331464/somatic-cell-count-based-selection-reduces-susceptibility-to-energy-shortage-during-early-lactation-in-a-sheep-model
#7
J Bouvier-Muller, C Allain, F Enjalbert, Y Farizon, D Portes, G Foucras, R Rupp
During the transition from late gestation to early lactation ruminants experience a negative energy balance (NEB), which is considered to increase susceptibility to mammary infections. Our previous study in 2 divergent lines of sheep selected for high and low somatic cell score (SCS) suggested an association between the response to NEB and genetic susceptibility to mastitis. Forty-eight early-lactation primiparous dairy ewes from the 2 SCS genetic lines were allocated to 2 homogeneous subgroups-an NEB group, which was energy restricted and received 60% of the energy requirements for 15 d, and a control-fed group-to obtain 4 balanced groups of 12 ewes: high-SCS positive energy balance, low-SCS positive energy balance, high-SCS NEB, and low-SCS NEB...
January 10, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29329972/enhanced-production-of-lactate-based-polyesters-in-escherichia-coli-from-a-mixture-of-glucose-and-xylose-by-mlc-mediated-catabolite-derepression
#8
Ryosuke Kadoya, Ken'ichiro Matsumoto, Kenji Takisawa, Toshihiko Ooi, Seiichi Taguchi
Lignocellulose-utilizing biorefinery is a promising strategy for the sustainable production of value-added products such as bio-based polymers. Simultaneous consumption of glucose and xylose in Escherichia coli was achieved by overexpression of the gene encoding Mlc, a multiple regulator of glucose and xylose uptake. This catabolite derepression gave the enhancement in the production of poly (15 mol% lactate-co-3-hydroxybutyrate), up to 65% from 50% (wild-type strain) in the cellular contents, of the Mlc-overexpressing strain of E...
January 9, 2018: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/29329945/model-of-acetic-acid-affected-growth-and-poly-3-hydroxybutyrate-production-by-cupriavidus-necator-dsm-545
#9
Jaruwan Marudkla, Wen-Chien Lee, Siwaporn Wannawilai, Yusuf Chisti, Sarote Sirisansaneeyakul
Acetic acid, a potential growth inhibitor, commonly occurs in lignocellulosic hydrolysates. The growth of Cupriavidus necator DSM 545 and production of poly(3-hydroxybutyrate) (PHB) by this bacterium in a glucose-based medium supplemented with various initial concentrations of acetic acid are reported. The bacterium could use both glucose and acetic acid to grow and produce PHB, but acetic acid inhibited growth once its initial concentration exceeded 0.5 g/L. As acetic acid is an unavoidable contaminant in hydrolysates used as sugar sources in commercial fermentations, a mathematical model was developed to describe its impact on growth and the production of PHB...
January 9, 2018: Journal of Biotechnology
https://www.readbyqxmd.com/read/29325899/do-ketone-bodies-mediate-the-anti-seizure-effects-of-the-ketogenic-diet
#10
REVIEW
Timothy A Simeone, Kristina A Simeone, Carl E Stafstrom, Jong M Rho
Although the mechanisms underlying the anti-seizure effects of the high-fat ketogenic diet (KD) remain unclear, a long-standing question has been whether ketone bodies (i.e., beta-hydroxybutyrate [BHB], acetoacetate [ACA] and acetone), either alone or in combination, contribute mechanistically. The traditional belief has been that while ketone bodies reflect enhanced fatty acid oxidation and a general shift toward intermediary metabolism, they are not likely to be the key mediators of the KD's clinical effects, as blood levels of BHB do not correlate consistently with improved seizure control...
January 8, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29325636/left-atrial-appendage-closure-and-systemic-homeostasis-the-laa-homeostasis-study
#11
Dhanunjaya Lakkireddy, Mohit Turagam, Muhammad Rizwan Afzal, Johnson Rajasingh, Donita Atkins, Buddhadeb Dawn, Luigi Di Biase, Krzysztof Bartus, Saibal Kar, Andrea Natale, David J Holmes
BACKGROUND: The impact of left atrial appendage (LAA) exclusion, comparing an epicardial LAA or an endocardial LAA device, on systemic homeostasis remains unknown. OBJECTIVES: This study compared the effects of epicardial or endocardial LAA devices on the neurohormonal profiles of patients, emphasizing the roles of the renin-angiotensin-aldosterone system and the autonomic nervous system. METHODS: This is a prospective, single-center, observational study including 77 patients who underwent LAA closure by an epicardial (n = 38) or endocardial (n = 39) device...
January 16, 2018: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29323923/dynamic-changes-of-intracellular-monomer-levels-regulate-block-sequence-of-polyhydroxyalkanoates-in-engineered-escherichia-coli
#12
Ken'ichiro Matsumoto, Chiaki Hori, Ryunosuke Fujii, Masahiro Takaya, Takashi Ooba, Toshihiko Ooi, Takuya Isono, Toshifumi Satoh, Seiichi Taguchi
Biological polymer synthetic systems, which utilize no template molecules, normally synthesize random copolymers. We report an exception, a synthesis of block polyhydroxyalkanoates (PHAs) in an engineered Escherichia coli. Using an engineered PHA synthase, block copolymers poly[(R)-2-hydroxybutyrate(2HB)-b-(R)-3-hydroxybutyrate(3HB)] were produced in E. coli. The covalent linkage between P(2HB) and P(3HB) segments was verified with solvent fractionation and microphase separation. Notably, the block sequence was generated under the simultaneous consumption of two monomer precursors, indicating the existence of a rapid monomer switching mechanism during polymerization...
January 11, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29319921/enantioselective-and-simultaneous-determination-of-lactate-and-3-hydroxybutyrate-in-human-plasma-and-urine-using-a-narrow-bore-online-two-dimensional-hplc-system
#13
Chin-Ling Hsieh, Reiko Koga, Aogu Furusho, Takeyuki Akita, Masashi Mita, Tomomi Ide, Jen-Ai Lee, Kenji Hamase
For the enantioselective and simultaneous analysis of lactate and 3-hydroxybutyrate, a validated online two-dimensional high-performance liquid chromatography system using 4-nitro-7-piperazino-2,1,3-benzoxadiazole as a fluorescent derivatization reagent has been developed. For the reversed-phase separation in the first dimension, a Capcell Pak C18 ACR column (1.5 × 250 mm, particle size 3 μm) was used, and the target fractions were isolated by their hydrophobicity. In the second dimension, a polysaccharide-coated enantioselective column, Chiralpak AD-H (2...
January 10, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29316143/basal-insulin-peglispro-increases-lipid-oxidation-metabolic-flexibility-thermogenesis-and-ketone-bodies-compared-to-insulin-glargine-in-subjects-with-type-1-diabetes-mellitus
#14
Niels K Porksen, Helle Linnebjerg, Eric Chen Quin Lam, Parag Garhyan, Alok Pachori, Richard E Pratley, Steven R Smith
AIMS: When treated with basal insulin peglispro (BIL), patients with type 1 diabetes mellitus (T1DM) exhibit weight loss and lower prandial insulin requirements versus insulin glargine (GL), while total insulin requirements remain similar. One possible explanation is enhanced lipid oxidation and improved ability to switch between glucose and lipid metabolism with BIL. This study compared the effects of BIL and GL on glucose and lipid metabolism in subjects with T1DM. MATERIALS AND METHODS: Fifteen subjects with T1DM were enrolled into this open-label, randomised, crossover study, and received once-daily stable, individualised, subcutaneous doses of BIL and GL for 4 weeks each...
January 8, 2018: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/29315663/circulating-25-hydroxyvitamin-d-nasopharyngeal-airway-metabolome-and-bronchiolitis-severity
#15
Kohei Hasegawa, Christopher J Stewart, Juan C Celedón, Jonathan M Mansbach, Courtney Tierney, Carlos A Camargo
Low circulating 25-hydroxyvitamin D (25OHD) levels are a risk factor for acute respiratory infection (e.g., bronchiolitis) in children. However, little is known about the relation of circulating 25OHD with the many downstream functional molecules in target organs - such as the airway - and with clinical outcomes. In this prospective multicenter study of infants (age <1 year) hospitalized with bronchiolitis, we measured serum 25OHD levels and profiled the metabolome of 144 nasopharyngeal airway samples. Among 254 metabolites identified, we defined a set of 20 metabolites that are related to lower serum 25OHD and higher vitamin D-binding protein levels...
January 9, 2018: Allergy
https://www.readbyqxmd.com/read/29314217/direct-assessment-of-renal-mitochondrial-redox-state-using-hyperpolarized-13-c-acetoacetate
#16
Cornelius von Morze, Michael A Ohliger, Irene Marco-Rius, David M Wilson, Robert R Flavell, David Pearce, Daniel B Vigneron, John Kurhanewicz, Zhen J Wang
PURPOSE: The purpose of this study was to investigate the hyperpolarized ketone body 13 C-acetoacetate (AcAc) and its conversion to 13 C-β-hydroxybutyrate (βOHB) in vivo, catalyzed by β-hydroxybutyrate dehydrogenase (BDH), as a novel direct marker of mitochondrial redox state. METHODS: [1,3-13 C2 ]AcAc was synthesized by hydrolysis of the ethyl ester, and hyperpolarized via dissolution DNP. Cold storage under basic conditions resulted in sufficient chemical stability for use in hyperpolarized (HP) MRI studies...
January 3, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29313065/correction-to-environmental-biodegradation-of-haloarchaea-produced-poly-3-hydroxybutyrate-co-3-hydroxyvalerate-in-activated-sludge
#17
Xiao-Bin Liu, Lin-Ping Wu, Jing Hou, Jun-Yu Chen, Jing Han, Hua Xiang
The published online version contains mistake in the funding information. Instead of 30370096, it should have been 31370096.
January 8, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29312582/shexiang-tongxin-dropping-pill-protects-against-isoproterenol-induced-myocardial-ischemia-in-vivo-and-in-vitro
#18
Jianyong Qi, Wenjun Pan, Yafang Tan, Jiaru Luo, Dancai Fan, Juan Yu, Jiashin Wu, Minzhou Zhang
Shexiang Tongxin dropping pill (STDP) is a formulae of Chinese Medicine commonly used to treating angina pectoris in China. However, its mechanism of action is still yet unclear. This study investigated the roles of STDP on myocardial ischemia injury. We constructed a rat model of myocardial injury (isoproterenol subcutaneous injection, i.h, 85 mg/kg/day for 2 days), and compared among 4 groups: CON (control), ISO (ischemic injury model), MET (metoprolol), and STDP. Serum contents of Troponin I (cTnI), creatine kinase (CK), CK-MB, lactate dehydrogenase (LDH), alpha-hydroxybutyric dehydrogenase (α-HBD), and Aspartate Aminotransferase were detected and five STDP doses (1, 10, 100, 1000 and 10000 mg/kg/day) were chosen to obtain a dose-response curve...
December 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/29311546/one-step-fermentative-production-of-aromatic-polyesters-from-glucose-by-metabolically-engineered-escherichia-coli-strains
#19
Jung Eun Yang, Si Jae Park, Won Jun Kim, Hyeong Jun Kim, Bumjoon J Kim, Hyuk Lee, Jihoon Shin, Sang Yup Lee
Aromatic polyesters are widely used plastics currently produced from petroleum. Here we engineer Escherichia coli strains for the production of aromatic polyesters from glucose by one-step fermentation. When the Clostridium difficile isocaprenoyl-CoA:2-hydroxyisocaproate CoA-transferase (HadA) and evolved polyhydroxyalkanoate (PHA) synthase genes are overexpressed in a D-phenyllactate-producing strain, poly(52.3 mol% 3-hydroxybutyrate (3HB)-co-47.7 mol% D-phenyllactate) can be produced from glucose and sodium 3HB...
January 8, 2018: Nature Communications
https://www.readbyqxmd.com/read/29298737/a-feasible-model-for-early-intervention-for-high-risk-substance-use-in-the-emergency-department-setting
#20
Rebecca Howard, Stephanie Fry, Andrew Chan, Brigid Ryan, Yvonne Bonomo
Objective In response to escalating alcohol and other drug (AOD)-related emergency department (ED) presentations, a tertiary Melbourne hospital embedded experienced AOD clinical nurse consultants in the ED on weekends to trial a model for screening, assessment and brief intervention (BI). The aim of the present study was to evaluate the relative contributions of AOD to ED presentations and to pilot a BI model.Methods Using a customised AOD screening tool and a framework for proactive case finding, screened participants were offered a comprehensive AOD assessment and BI in the ED...
January 4, 2018: Australian Health Review: a Publication of the Australian Hospital Association
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