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https://www.readbyqxmd.com/read/29778988/synthesis-microstructure-and-mechanical-behaviour-of-a-unique-porous-phbv-scaffold-manufactured-using-selective-laser-sintering
#1
Sven H Diermann, Mingyuan Lu, Yitian Zhao, Luigi-Jules Vandi, Matthew Dargusch, Han Huang
Selective Laser Sintering (SLS) is a promising technique for manufacturing bio-polymer scaffolds used in bone tissue engineering applications. Conventional scaffolds made using SLS have complex engineered architectures to introduce adequate porosity and pore interconnectivity. This study presents an alternative approach to manufacture scaffolds via SLS without using pre-designed architectures. In this work, a SLS process was developed for fabricating interconnected porous biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) scaffolds with large surface areas and relative porosities of up to 80%...
May 17, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29778475/performance-nutritional-behavior-and-metabolic-responses-of-calves-supplemented-with-forage-depend-on-starch-fermentability
#2
S Mojahedi, M Khorvash, G R Ghorbani, E Ghasemi, M Mirzaei, F Hashemzadeh-Cigari
This study evaluated the interactive effects of forage provision on performance, nutritional behavior, apparent digestibility, rumen fermentation, and blood metabolites of dairy calves when corn grains with different fermentability were used. Sixty 3-d-old Holstein calves were randomly assigned to 1 of 4 treatments in a 2 × 2 factorial arrangement. Dietary treatments were (1) steam-flaked (SF) corn without alfalfa hay (AH) supplementation (SF-NO), (2) SF corn with AH supplementation (SF-AH), (3) cracked (CR) corn without AH supplementation (CR-NO), and (4) CR corn with AH supplementation (CR-AH)...
May 16, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29778319/anti-infective-biomaterials-with-surface-decorated-tachyplesin-i
#3
Qiong Xue, Xiao-Bin Liu, Yeh-Hsing Lao, Lin-Ping Wu, Dong Wang, Zhen-Qiang Zuo, Jun-Yu Chen, Jing Hou, Yuan-Yuan Bei, Xue-Fei Wu, Kam W Leong, Hua Xiang, Jing Han
Implants decorated with antimicrobial peptides (AMPs) can prevent infection and reduce the risk of creating antibiotic resistance. Yet the restricted mobility of surficial AMP often compromises its activity. Here, we report a simple but effective strategy to allow a more flexible display of AMP on the biomaterial surface and demonstrate its efficacy for wound healing. The AMP, tachyplesin I (Tac), is tagged with the polyhydroxyalkanoate-granule-associated protein (PhaP) and immobilized on haloarchaea-produced poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) via hydrophobic interaction...
May 9, 2018: Biomaterials
https://www.readbyqxmd.com/read/29778008/plasma-metabolic-changes-in-chinese-hiv-infected-patients-receiving-lopinavir-ritonavir-based-treatment-implications-for-hiv-precision-therapy
#4
Xiaolin Li, Tong Wu, Yongjun Jiang, Zining Zhang, Xiaoxu Han, Wenqing Geng, Haibo Ding, Jing Kang, Qi Wang, Hong Shang
OBJECTIVES: The goal of this study is to profile the metabolic changes in the plasma of HIV patients receiving lopinavir/ritonavir (LPV/r)-based highly active antiretroviral therapy (HAART) relative to their treatment-naïve phase, aimed to identify precision therapy for HIV for improving prognosis and predicting dyslipidemia caused by LPV/r. METHODS: 38 longitudinal plasma samples were collected from 19 HIV-infected patients both before and after antiretroviral therapy, and 18 samples from healthy individuals were used as controls...
May 16, 2018: Cytokine
https://www.readbyqxmd.com/read/29775906/bioaugmentation-with-diaphorobacter-polyhydroxybutyrativorans-to-enhance-nitrate-removal-in-a-poly-3-hydroxybutyrate-co-3-hydroxyvalerate-supported-denitrification-reactor
#5
Shusong Zhang, Xingbin Sun, Xuming Wang, Tianlei Qiu, Min Gao, Yanmei Sun, Shoutao Cheng, Qingjing Zhang
A newly isolated and identified Diaphorobacter polyhydroxybutyrativorans strain (SL-205) was employed to enhance the denitrification performance of a laboratory-scale solid-phase denitrification (SPD) reactor using poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) as a carbon source, and dynamic variations in microbial communities in the reactor were investigated. Results indicated that bioaugmentation with strain SL-205 enabled rapid reactor startup and improved denitrification performance relative to the reactor inoculated with activated sludge...
May 9, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29772023/prepartum-supplementation-of-conjugated-linoleic-acids-cla-increased-milk-energy-output-and-decreased-serum-fatty-acids-and-%C3%AE-hydroxybutyrate-in-early-lactation-dairy-cows
#6
Rafael Caputo Oliveira, Ryan S Pralle, Lucas C de Resende, Carlos Henrique P C Nova, Valentina Caprarulo, Joshua A Jendza, Arnulf Troescher, Heather M White
Prepartum supplementation with conjugated linoleic acid (CLA) may influence lipolysis and hyperketonemia in dairy cows. The objective of this study was to examine the effect of prepartum CLA supplementation on lactation performance and serum fatty acids (FA) and β-hydroxybutyrate (BHB) in early lactation dairy cows, and secondarily on reproductive performance. Multiparous cows were enrolled in the study at 18 days prior to expected calving date, and randomly assigned 100 g/day of Lutrell Pure (BASF, Ludwigshafen, Germany; 75% FA), providing 10 g/day of each CLA isomer (trans-10 cis-12 and cis-9 trans-11 CLA) or equivalent amount of rumen inert fatty acids as control (78 g/day of Energy Booster 100; Milk Specialties Global, Eden Prairie, MN)...
2018: PloS One
https://www.readbyqxmd.com/read/29771336/fto-is-a-transcriptional-repressor-to-auto-regulate-its-own-gene-and-potentially-associated-with-homeostasis-of-body-weight
#7
Shu-Jing Liu, Hui-Ling Tang, Qian He, Ping Lu, Tao Fu, Xu-Ling Xu, Tao Su, Mei-Mei Gao, Shumin Duan, Yan Luo, Yue-Sheng Long
Fat mass and obesity-associated (FTO) protein is a ferrous ion (Fe2+)/2-oxoglutarate (2-OG)-dependent demethylase preferentially catalyzing m6A sites in RNA. The FTO gene is highly expressed in the hypothalamus with fluctuation in response to various nutritional conditions, which is believed to be involved in the control of whole body metabolism. However, the underlying mechanism in response to different nutritional cues remains poorly understood. Here we show that ketogenic diet-derived ketone body β-hydroxybutyrate (BHB) transiently increases FTO expression in both mouse hypothalamus and cultured cells...
May 16, 2018: Journal of Molecular Cell Biology
https://www.readbyqxmd.com/read/29764418/engineering-xylose-metabolism-for-production-of-polyhydroxybutyrate-in-the-non-model-bacterium-burkholderia-sacchari
#8
Linda P Guamán, Carlos Barba-Ostria, Fuzhong Zhang, Edmar R Oliveira-Filho, José Gregório C Gomez, Luiziana F Silva
BACKGROUND: Despite its ability to grow and produce high-value molecules using renewable carbon sources, two main factors must be improved to use Burkholderia sacchari as a chassis for bioproduction at an industrial scale: first, the lack of molecular tools to engineer this organism and second, the inherently slow growth rate and poly-3-hydroxybutyrate [P(3HB)] production using xylose. In this work, we have addressed both factors. RESULTS: First, we adapted a set of BglBrick plasmids and showed tunable expression in B...
May 15, 2018: Microbial Cell Factories
https://www.readbyqxmd.com/read/29758532/evaluation-of-the-nova-vet-meter-for-sheep-side-monitoring-of-%C3%AE-hydroxybutyric-acid-bhba-and-description-of-ewe-bhba-during-late-gestation-in-three-flocks-from-the-northeastern-u-s
#9
Amanda K Jones, Rachael E Gately, Tasia D Kellogg, Steven A Zinn, Kristen E Govoni, Sarah A Reed
Prevention of metabolic diseases in small ruminants may improve production efficiency and profitability, yet ewes carrying multiples or who are in poor body condition are at increased susceptibility to develop ketosis. This study evaluated the hand-held Nova Vet Meter to accurately detect β-hydroxybutyric acid (BHBA) concentrations in ewes and determined the percentage of ewes at moderate (0.8 to 1.5 mmol/L BHBA) and greatest (≥1.6 mmol/L BHBA) risk to develop ketosis during late gestation. To validate the Nova Vet Meter, BHBA concentrations of 104 paired blood samples were measured using the Nova Vet Meter and gold-standard laboratory analysis...
May 7, 2018: Research in Veterinary Science
https://www.readbyqxmd.com/read/29753468/effects-of-phytonutrients-alone-or-in-combination-with-monensin-on-productivity-in-lactating-dairy-cows
#10
J Oh, M Harper, C H Lang, E H Wall, A N Hristov
This experiment was conducted to investigate the effects of phytonutrients, compared with monensin as a positive control, on productivity, milk fatty acids, fat mobilization, and blood cells in lactating dairy cows. Thirty-six Holstein cows were used in a 9-wk randomized complete block design study. Following a 2-wk covariate period, cows were blocked by days in milk, parity, and milk yield and randomly assigned to 1 of 3 treatments (12 cows/treatment): 450 mg/cow per day of monensin (MO), 250 mg/cow per day of capsicum plus 450 mg/cow per day of MO (MOCAP), and 1,000 mg/cow per day of a mixture of cinnamaldehyde, eugenol, and capsicum (CEC)...
May 9, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29752707/nmr-metabolomic-study-of-blood-plasma-in-ischemic-and-ischemically-preconditioned-rats-an-increased-level-of-ketone-bodies-and-decreased-content-of-glycolytic-products-24-h-after-global-cerebral-ischemia
#11
Eva Baranovicova, Marian Grendar, Dagmar Kalenska, Anna Tomascova, Daniel Cierny, Jan Lehotsky
Cardiac arrest is one of the leading causes of death among adults in older age. Understanding mechanisms how organism responds to ischemia at global level is essential for the prevention and ischemic patient's treatment. In this study, we used a global cerebral ischemia induced by four-vessel occlusion as an established animal model for ischemic stroke to investigate metabolic changes after 24 h reperfusion, when transitions occur due to the onset of delayed neuronal death. We also focused on the endogenous phenomenon known as ischemic tolerance by the pre-ischemic treatment...
May 11, 2018: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/29752098/three-dimensional-printing-and-in-vitro-evaluation-of-poly-3-hydroxybutyrate-scaffolds-functionalized-with-osteogenic-growth-peptide-for-tissue-engineering
#12
Sybele Saska, Luana Carla Pires, Mariana Aline Cominotte, Larissa Souza Mendes, Marcelo Fernandes de Oliveira, Izaque Alves Maia, Jorge Vicente Lopes da Silva, Sidney José Lima Ribeiro, Joni Augusto Cirelli
Poly(3-hydroxybutyrate) (PHB) is a biodegradable and thermoprocessable biopolymer, making it a promising candidate for applications in tissue engineering. In the present study a structural characterization and in vitro evaluation were performed on PHB scaffolds produced by additive manufacturing via selective laser sintering (SLS), followed by post-printing functionalization with osteogenic growth peptide (OGP) and its C-terminal sequence OGP(10-14). The PHB scaffolds were characterized, including their morphology, porosity, thermal and mechanical properties, moreover OGP release...
August 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29751601/novel-sustainable-composites-based-on-poly-hydroxybutyrate-co-hydroxyvalerate-and-seagrass-beach-cast-fibers-performance-and-degradability-in-marine-environments
#13
Maurizia Seggiani, Patrizia Cinelli, Elena Balestri, Norma Mallegni, Eleonora Stefanelli, Alessia Rossi, Claudio Lardicci, Andrea Lazzeri
In order to produce sustainable, bio-based and highly biodegradable materials, composites based on poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) and fibers of Posidonia oceanica (PO), a dominant Mediterranean seagrass, were produced by simple melt mixing and characterized in terms of thermal stability, morphology and rheological/mechanical properties. In view of their potential application in marine environments, degradation of the developed composites was evaluated under simulated and real marine environmental conditions for 1 year...
May 11, 2018: Materials
https://www.readbyqxmd.com/read/29751295/the-availability-of-second-generation-feedstocks-for-the-treatment-of-acid-mine-drainage-and-to-improve-south-africa-s-bio-based-economy
#14
Dirk Karl Westensee, Karl Rumbold, Kevin G Harding, Craig M Sheridan, Lizelle D van Dyk, Geoffrey S Simate, Ferdinand Postma
South Africa has a wide range of mining activities making mineral resources important economic commodities. However, the industry is responsible for several environmental impacts; one of which is acid mine drainage (AMD). Despite several years of research, attempts to prevent AMD generation have proven to be difficult. Therefore, treatment of the resulting drainage has been common practice over the years. One of the recommended treatment methods is the use of second generation feedstocks (lignocellulosic biomass)...
May 8, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29751077/procyanidin-b2-protects-against-d-galactose-induced-mimetic-aging-in-mice-metabolites-and-microbiome-analysis
#15
Ying Xiao, Jialin Dong, Zhiting Yin, Qiguo Wu, Yiming Zhou, Xiaoli Zhou
To elucidate the possible mechanisms for the preventive effect of procyanidin B2 on aging, a combined analysis of metabolic profile and gut microbiome was carried out in the present study. The mimetic aged mice induced by d-galactose injection (500 mg/kg, sc daily), and the preventive group was fed with the diet plus 0.2% procyanidin B2. After 7 weeks of treatment, the spatial memory was assayed using the Morris water maze test. Procyanidin B2 significantly ameliorated the impaired memory and antioxidant abilities induced by d-galactose...
May 8, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29748663/direct-neurotransmitter-activation-of-voltage-gated-potassium-channels
#16
Rían W Manville, Maria Papanikolaou, Geoffrey W Abbott
Voltage-gated potassium channels KCNQ2-5 generate the M-current, which controls neuronal excitability. KCNQ2-5 subunits each harbor a high-affinity anticonvulsant drug-binding pocket containing an essential tryptophan (W265 in human KCNQ3) conserved for >500 million years, yet lacking a known physiological function. Here, phylogenetic analysis, electrostatic potential mapping, in silico docking, electrophysiology, and radioligand binding assays reveal that the anticonvulsant binding pocket evolved to accommodate endogenous neurotransmitters including γ-aminobutyric acid (GABA), which directly activates KCNQ5 and KCNQ3 via W265...
May 10, 2018: Nature Communications
https://www.readbyqxmd.com/read/29747346/-phenotype-and-mechanism-of-inducible-ppp2r1a-knockout-mouse-model
#17
J L Fan, F P Wang, S Wang, X L Liu, X N Wu, W Chen, L P Chen, W X Li
Objective: Investigate the effects of inducible ppp2r1a knockout on main physiological function in adult mice and study the mechanism. Methods: Ppp2r1a(flox/flox) mice and CAGG-CreER mice were hybridized to obtain 20 CAGG-CreER ppp2r1a(flox/flox) and 20 mice in homozygous group. Two groups of mice were divided into 4 groups respectively, finally we got 8 groups with 5 mice in each group. Tamoxifen was injected intraperitoneally to acquire inducible ppp2r1a knockout mice. The knockout efficiency of PP2A Aα in vital organs was measured by Western blot...
May 6, 2018: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/29747099/nitrogen-removal-performance-and-functional-genes-distribution-patterns-in-solid-phase-denitrification-sub-surface-constructed-wetland-with-micro-aeration
#18
Haimeng Sun, Zhongchen Yang, Caijie Wei, Weizhong Wu
An up-flow vertical flow constructed wetland (AC-VFCW) filled with ceramsite and 5% external carbon source poly(3-hydroxybutyrate-hydroxyvalerate) (PHBV) as substrate was set for nitrogen removal with micro aeration. Simultaneous nitrification and denitrification process was observed with 90.4% NH4 + -N and 92.1% TN removal efficiencies. Nitrification and denitrification genes were both preferentially enriched on the surface of PHBV. Nitrogen transformation along the flow direction showed that NH4 + -N was oxidized to NO3 - -N at the lowermost 10 cm of the substrate and NO3 - -N gradually degraded over the depth...
April 26, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29740008/virulence-inhibitory-activity-of-the-degradation-product-3-hydroxybutyrate-explains-the-protective-effect-of-poly-%C3%AE-hydroxybutyrate-against-the-major-aquaculture-pathogen-vibrio-campbellii
#19
Tom Defoirdt, Nguyen Thi Mai Anh, Peter De Schryver
The bacterial storage compound poly-β-hydroxybutyrate, a polymer of the short-chain fatty acid 3-hydroxybutyrate, has been reported to protect various aquatic animals from bacterial disease. In order to obtain a better mechanistic insight, we aimed to (1) investigate whether 3-hydroxybutyrate is released from poly-β-hydroxybutyrate within sterile brine shrimp larvae, (2) determine the impact of 3-hydroxybutyrate on the virulence of Vibrio campbellii to brine shrimp larvae and on its cell density in the shrimp, and (3) determine the impact of this compound on virulence factor production in the pathogen...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29739955/surface-modification-of-spions-in-phbv-microspheres-for-biomedical-applications
#20
Maizlinda I Idris, Jan Zaloga, Rainer Detsch, Judith A Roether, Harald Unterweger, Christoph Alexiou, Aldo R Boccaccini
Surface modification of superparamagnetic iron oxide nanoparticles (SPIONs) has been introduced with lauric acid and oleic acid via co-precipitation and thermal decomposition methods, respectively. This modification is required to increase the stability of SPIONs when incorporated in hydrophobic, biodegradable and biocompatible polymers such as poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). In this work, the solid-in-oil-in-water (S/O/W) emulsion-solvent extraction/evaporation method was utilized to fabricate magnetic polymer microspheres incorporating SPIONs in PHBV...
May 8, 2018: Scientific Reports
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