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https://www.readbyqxmd.com/read/29353453/optimization-of-biodiesel-synthesis-by-esterification-using-a-fermented-solid-produced-by-rhizopus-microsporus-on-sugarcane-bagasse
#1
Vanderleia Botton, Leandro Piovan, Henry França Meier, David Alexander Mitchell, Jesús Cordova, Nadia Krieger
A fermented solid containing lipases was produced by solid-state fermentation of Rhizopus microsporus on sugarcane bagasse enriched with urea, soybean oil, and a mineral solution. The dry fermented solid produced using R. microsporus (RMFS) was used to catalyze the synthesis of alkyl-esters by esterification in a solvent-free system containing ethanol and oleic acid (as a model system) or a mixture of fatty acids obtained from the physical hydrolysis of soybean soapstock acid oil (FA-SSAO) in subcritical water...
January 20, 2018: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/29353356/generation-of-shrimp-waste-based-dispersant-for-oil-spill-response
#2
Kedong Zhang, Baiyu Zhang, Xing Song, Bo Liu, Liang Jing, Bing Chen
In this study, shrimp waste was enzymatically hydrolyzed to generate a green dispersant and the product was tested for crude oil dispersion in seawater. The hydrolysis process was first optimized based on the dispersant effectiveness (DE) of the product. The functional properties of the product were identified including stability, critical micelle concentration, and emulsification activity. Water was confirmed as a good solvent for dispersant generation when compared with three chemical solvents. The effects of salinity, mixing energy, and temperature on the dispersion of the Alaska North Slope (ANS) crude oil were examined...
January 20, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29353324/stromalized-microreactor-supports-murine-hematopoietic-progenitor-enrichment
#3
Danika Khong, Matthew Li, Amy Singleton, Ling-Yee Chin, Biju Parekkadan
There is an emerging need to process, expand, and even genetically engineer hematopoietic stem and progenitor cells (HSPCs) prior to administration for blood reconstitution therapy. A closed-system and automated solution for ex vivo HSC processing can improve adoption and standardize processing techniques. Here, we report a recirculating flow bioreactor where HSCs are stabilized and enriched for short-term processing by indirect fibroblast feeder coculture. Mouse 3 T3 fibroblasts were seeded on the extraluminal membrane surface of a hollow fiber micro-bioreactor and were found to support HSPC cell number compared to unsupported BMCs...
January 20, 2018: Biomedical Microdevices
https://www.readbyqxmd.com/read/29353313/general-solution-of-the-chemical-master-equation-and-modality-of-marginal-distributions-for-hierarchic-first-order-reaction-networks
#4
Matthias Reis, Justus A Kromer, Edda Klipp
Multimodality is a phenomenon which complicates the analysis of statistical data based exclusively on mean and variance. Here, we present criteria for multimodality in hierarchic first-order reaction networks, consisting of catalytic and splitting reactions. Those networks are characterized by independent and dependent subnetworks. First, we prove the general solvability of the Chemical Master Equation (CME) for this type of reaction network and thereby extend the class of solvable CME's. Our general solution is analytical in the sense that it allows for a detailed analysis of its statistical properties...
January 20, 2018: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/29353246/a-concept-mapping-approach-to-identifying-the-barriers-to-implementing-an-evidence-based-sports-injury-prevention-programme
#5
Alex Donaldson, Aisling Callaghan, Mario Bizzini, Andrew Jowett, Patrick Keyzer, Matthew Nicholson
BACKGROUND AND AIM: Understanding the barriers to programme use is important to facilitate implementation of injury prevention programmes in real-word settings. This study investigated the barriers to coaches of adolescent female soccer teams, in Victoria, Australia, implementing the evidence-based FIFA 11+ injury prevention programme. METHODS: Concept mapping with data collected from 19 soccer coaches and administrators. RESULTS: Brainstorming generated 65 statements as barriers to 11+ implementation...
January 20, 2018: Injury Prevention: Journal of the International Society for Child and Adolescent Injury Prevention
https://www.readbyqxmd.com/read/29353196/high-adsorption-of-methylene-blue-by-salicylic-acid-methanol-modified-steel-converter-slag-and-evaluation-of-its-mechanism
#6
Min Cheng, Guangming Zeng, Danlian Huang, Cui Lai, Yang Liu, Chen Zhang, Rongzhong Wang, Lei Qin, Wenjing Xue, Biao Song, Shujing Ye, Huan Yi
A novel adsorbent based on steel converter slag (SCS), useful for adsorbing cationic pollutants from water was prepared by a simple method. The characterization showed that salicylic acid-methanol (SAM) modification selectively removed calcium silicate minerals from the surface of SCS and lead to a prominent increase in the specific surface areas. The maximum adsorption capacity of SAM-modified SCS for methylene blue (MB) at initial pH of 7.0 and temperature of 293 K was 41.62 mg/g, which is 35.2-times higher than that of SCS (1...
January 3, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29353188/mechanism-of-anaerobic-bio-reduction-of-azo-dye-assisted-with-lawsone-immobilized-activated-carbon
#7
Daniel Olivo-Alanis, Refugio Bernardo Garcia-Reyes, Luis H Alvarez, Alcione Garcia-Gonzalez
Lawsone redox (LQ) mediator was covalently bound to granular activated carbon (GAC) by Fischer esterification. A high LQ adsorption capacity on GAC was achieved (∼230 mg/g), and desorption studies showed strong chemical stability. Furthermore, kinetic experiments with solid-phase redox mediator (RM) and their controls (soluble RM, GAC and anaerobic sludge) were tested for decolorization of congo red dye at initial concentration of 175 mg/L. Benzidine, a by-product of complete congo red reduction, was also measured by HPLC analysis along the kinetic experiments...
January 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29353115/efficient-removal-of-acid-green-25-dye-from-wastewater-using-activated-prunus-dulcis-as-biosorbent-batch-and-column-studies
#8
Suyog N Jain, Parag R Gogate
Biosorbent synthesized from dead leaves of Prunus Dulcis with chemical activation during the synthesis was applied for the removal of Acid Green 25 dye from wastewater. The obtained biosorbent was characterized using Brunauer-Emmett-Teller analysis, Fourier transform-infrared spectroscopy and scanning electron microscopy measurements. It was demonstrated that alkali treatment during the synthesis significantly increased surface area of biosorbent from 67.205 to 426.346 m2/g. The effect of various operating parameters on dye removal was investigated in batch operation and optimum values of parameters were established as pH of 2, 14 g/L as the dose of natural biosorbent and 6 g/L as the dose of alkali treated biosorbent...
January 17, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29353112/bioleaching-of-metals-from-weee-shredding-dust
#9
Alessandra Marra, Alessandra Cesaro, Eldon R Rene, Vincenzo Belgiorno, Piet N L Lens
A bioleaching process developed in two separate steps was investigated for the recovery of base metals, precious metals and rare earth elements from dusts generated by Waste Electrical and Electronic Equipment (WEEE) shredding. In the first step, base metals were almost completely leached from the dust in 8 days by Acidithiobacillus thiooxidans (DSM 9463) that lowered the pH of the leaching solution from 3.5 to 1.0. During this step, cerium, europium and neodymium were mobilized at high percentages (>99%), whereas lanthanum and yttrium reached an extraction yield of 80%...
January 15, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29353027/estrogen-receptor-%C3%AE-is-involved-in-tamoxifen-neuroprotective-effects-in-a-traumatic-brain-injury-male-rat-model
#10
Sher-Wei Lim, T T Eric Nyam, Cho-Ya Hu, Chung-Ching Chio, Che-Chuan Wang, Jinn-Rung Kuo
PURPOSE: The aim of the present study is to determine the neuroprotective mechanisms of tamoxifen (TMX) during traumatic brain injury (TBI), especially the effects on estrogen receptor-α (ERα) expression, as well as neuroinflammatory associations. MATERIAL AND METHODS: Anesthetized male Sprague-Dawley rats were divided into four groups: sham-operated controls, sham-operated controls given TMX (1 mg/kg/per day) for 3 days, those given a vehicle solution immediately after TBI, and those given TMX (1 mg/kg/per day) for 3 days...
January 15, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29352947/novel-organic-inorganic-hybrid-flower-like-structure-of-selenium-nanoparticles-stabilized-by-pullulan-derivatives
#11
Punnida Nonsuwan, Songchan Puthong, Tanapat Palaga, Nongnuj Muangsin
We proudly present the first organic/inorganic hybrid pullulan/SeNPs hybrid microflower material obtained using a simple and bio-inspired strategy. The chemical structures of pullulan, folic acid decorated cationic pullulan (FA-CP) were designed for stabilizing selenium nanoparticles (SeNPs). SeNPs stabilized by FA-CP hybrid microflowers were observed after the addition of a cysteine hydrochloride solution into the solution mixture of Na2SeO3 and FA-CP. We suggested that the concentrations of cysteine and FA-CP were the key factors for the formation of flower-like structure...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352942/comparative-study-of-molecular-recognition-of-folic-acid-subunits-with-cyclodextrins
#12
Magdalena Ceborska, Karolina Kędra-Królik, Aneta Aniela Kowalska, Małgorzata Koźbiał
The complexation of pteroic acid and pterine, subunits of folic acid, with native cyclodextrins (α‒, β‒, and γ‒CDs) was studied in solution (UV-vis), and in the solid state (thermal analysis, IR and Raman). UV-vis titrations at pH = 7.4 provided data regarding stoichiometry of the formed complexes as well as their associations constants. Stability of the complexes increases in the series: γ‒CD < β‒CD < α‒CD for pterine, and γ‒CD < α‒CD < β‒CD for pteroic acid...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352931/effects-of-chitosan-quaternary-ammonium-salt-on-the-physicochemical-properties-of-sodium-carboxymethyl-cellulose-based-films
#13
Beibei Wang, Xiaodeng Yang, Congde Qiao, Yan Li, Tianduo Li, Chunlin Xu
The effects of N-(2-hydroxyl)-propyl-3-trimethylammonium chitosan chloride (HTCC) on the physicochemical properties of sodium carboxymethyl cellulose (CMC)-based films were investigated. The prepared HTCC/CMC film-forming solutions (FFSs) with varying mass ratios exhibited shear-thinning behavior and typical pseudo-plasticity. The highest apparent viscosity and lowest crossover frequency was obtained for the HTCC/CMC FFS with a mass ratio of 10%, due to the formation of the strongest intermolecular interactions, which also led to the best mechanical properties...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352922/cellulose-nanofiber-embedded-sulfonated-poly-ether-sulfone-membranes-for-proton-exchange-membrane-fuel-cells
#14
Xianlin Xu, Rui Li, Chenxiao Tang, Hang Wang, Xupin Zhuang, Ya Liu, Weimin Kang, Lei Shi
Cellulose nanofibers were embedded into sulfonated poly (ether sulfone) matrix to heighten the water retention and proton conductivity of proton exchange membranes (PEMs). Cellulose nanofibers were obtained by hydrolyzing cellulose acetate nanofibers, which were prepared via electrostatic-induction-assisted solution blow spinning. Morphology, thermal stability, and mechanical properties of the PEMs were investigated. The results showed that proton conductivity, water uptake, and methanol permeability of the composite membranes were improved...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352914/silica-in-situ-enhanced-pva-chitosan-biodegradable-films-for-food-packages
#15
Zhen Yu, Baoqiang Li, Jiayu Chu, Peifeng Zhang
Non-degradable plastic food packages threaten the security of environment. The cost-effective and biodegradable polymer films with good mechanical properties and low permeability are very important for food packages. Among of biodegradable polymers, PVA/chitosan (CS) biodegradable films have attracted considerable attention because of feasible film forming ability. However, PVA/CS biodegradable films suffered from poor mechanical properties. To improve mechanical properties of PVA/CS biodegradable films, we developed SiO2in situ to enhance PVA/CS biodegradable films via hydrolysis of sodium metasilicate in presence of PVA and chitosan solution...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352905/glucose-sensitive-polyelectrolyte-microcapsules-based-on-alginate-chitosan-pair
#16
Sabrina Belbekhouche, Saddam Charaabi, Luc Picton, Didier Le Cerf, Benjamin Carbonnier
Novel chemical stimulus-responsive multilayer assemblies have been elaborated through the layer-by-layer deposition of oppositely charged polysaccharides on either flat or spherical surfaces. Concentration-dependent glucose responsiveness was obtained through chemical modification of alginate, selected as polyanion, with phenylboronic acid moieties. QCM measurements showed that the alginate derivate still self-assembles though electrostatically-driven interactions with chitosan at pH 4, and that the polysaccharides multilayer assemblies, as obtained after crosslinking, exhibit improved stability versus pH (in the range 4-9) as well as swelling ability in the presence of glucose-containing solution...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352903/isolation-fine-structure-and-morphology-studies-of-galactomannan-from-endosperm-of-gleditsia-japonica-var-delavayi
#17
Mingzhe Sun, Yumeng Li, Tianxin Wang, Yanwei Sun, Xiyuan Xu, Zesheng Zhang
The water-soluble polysaccharides extracted from endosperm of Gleditsia japonica var. delavayi seeds (EGSP) were identified as galactomannan having the M/G ratio of 2.54-2.66 and a weight average molecular weight (Mw) of 1913 kDa. The molecular structure of EGSP was determined by periodate oxidation, Smith degradation, methylation, FTIR and NMR spectroscopy. The main chain is composed of β-1,4-d-mannopyranose and the branches composed of single α-1-d-galactopyranose. We had also established a model to speculate the fine structure of galactomannan molecules and given preliminary results...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352894/a-novel-wound-dressing-based-on-a-konjac-glucomannan-silver-nanoparticle-composite-sponge-effectively-kills-bacteria-and-accelerates-wound-healing
#18
Honglei Chen, Guangqian Lan, Luoxiao Ran, Yang Xiao, Kun Yu, Bitao Lu, Fangying Dai, Dayang Wu, Fei Lu
A novel Konjac glucomannan/silver nanoparticle (KGM/AgNP) composite sponge was successfully prepared via a simple 2-step method for biomedical applications as wound-healing materials. First, AgNPs were prepared with green deoxidizer egg white. Then, KGM powder was added to the AgNP solution and stirred vigorously, and the composite sponge was obtained by freeze-drying. The KGM/AgNP composite sponge showed excellent water absorption and water retention, and considerable mechanical properties. KGM/AgNP composite sponges displayed good antibacterial activity against test microorganisms...
March 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352893/preparation-and-characterization-of-tree-like-cellulose-nanofiber-membranes-via-the-electrospinning-method
#19
REVIEW
Kai Zhang, Zongjie Li, Weimin Kang, Nanping Deng, Jing Yan, Jingge Ju, Yong Liu, Bowen Cheng
A novel tree-like cellulose nanofiber membrane was controllably fabricated via the electrospinning method by adding certain amount of tetra butyl ammonium chloride (TBAC) into the cellulose acetate solution followed by a deacetylation treatment process. The morphological structure, material structure and air filtration performance of both the cellulose and the cellulose acetate tree-like nanofiber membranes were characterized. Water contact angles, mechanical properties, and air filtration properties were also evaluated...
March 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352877/valorization-of-peanut-shells-manufacture-of-bioactive-oligosaccharides
#20
Xiana Rico, Beatriz Gullón, José Luis Alonso, Juan Carlos Parajó, Remedios Yáñez
Peanut shells were subjected to non-isothermal aqueous treatments to cause the partial breakdown of hemicelluloses into soluble oligosaccharides and lignin-derived compounds with high antioxidant activity. The effects of temperature on the chemical composition of the substrate and soluble reaction products were assessed. Under selected conditions (210°C, severity=4.09), the overall amount of poly- and oligo- saccharides present in the liquid phase reached 9.8g/L. This solution was refined by consecutive stages of discontinuous diafiltration, yielding a refined product containing about 72...
March 1, 2018: Carbohydrate Polymers
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