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https://www.readbyqxmd.com/read/30103171/amino-acid-based-poly-ester-urea-copolymer-films-for-hernia-repair-applications
#1
Nathan Z Dreger, Zhaobo Fan, Zachary K Zander, Chinnapatch Tantisuwanno, Molly C Haines, Morgan Waggoner, Trenton Parsell, Claus S Søndergaard, Michael Hiles, Christopher Premanandan, Matthew L Becker
The use of degradable materials is required to address current performance and functionality shortcomings from biologically-derived tissues and non-resorbable synthetic materials used for hernia mesh repair applications. Herein a series of degradable l-valine-co-l-phenylalanine poly(ester urea) (PEU) copolymers were investigated for soft-tissue repair. Poly[(1-VAL-8)0.7 -co-(1-PHE-6)0.3 ] showed the highest uniaxial mechanical properties (332.5 ± 3.5 MPa). Additionally, l-valine-co-l-phenylalanine poly(ester urea)s were blade coated on small intestine submucosa extracellular matrix (SIS-ECM) and found to enhance the burst test mechanical properties of SIS-ECM in composite films (force at break between 102...
August 3, 2018: Biomaterials
https://www.readbyqxmd.com/read/30103165/integrated-process-for-scalable-bioproduction-of-glycolic-acid-from-cell-catalysis-of-ethylene-glycol
#2
Xia Hua, Rou Cao, Xin Zhou, Yong Xu
Glycolic acid (GA) is presently booming as a versatile raw material in the fields of high-grade cosmetics, polymer degradable materials, and drug production. The biocatalysis of ethylene glycol (EG) to GA is promising, with environmentally friendly benefits, while the effective and straight bioproduction of GA qualified for polymer synthesis purity is a challenge. In this study, we combine whole cell catalysis step and acidification-purification step. A compressed oxygen supply in the sealed aerated stirred tank reaction (COS-SSTR) and a weak basic anion-exchange resins were integrated to develop an efficient process of GA bioproduction from EG...
August 7, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/30102833/electrospun-fibroin-polyurethane-hybrid-meshes-manufacturing-characterization-and-potentialities-as-substrates-for-haemodialysis-arteriovenous-grafts
#3
Sebastião van Uden, Valentina Catto, Giovanni Perotto, Athanassia Athanassiou, Alberto C L Redaelli, Francesco G Greco, Stefania A Riboldi
Several attempts made so far to combine silk fibroin and polyurethane, in order to prepare scaffolds encompassing the bioactivity of the former with the elasticity of the latter, suffer from critical drawbacks concerning industrial and clinical applicability (e.g., separation of phases upon processing, use of solvents unaddressed by the European Pharmacopoeia, and use of degradable polyurethanes). Overcoming these limitations, in this study, we report the successful blending of regenerated silk fibroin with a medical-grade, non-degradable polyurethane using formic acid and dichloromethane, and the manufacturing of hybrid, semi-degradable electrospun tubular meshes with different ratios of the two materials...
August 13, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/30102765/evaluation-of-oral-microbial-corrosion-on-the-surface-degradation-of-dental-implant-materials
#4
Danyal A Siddiqui, Lidia Guida, Sathyanarayanan Sridhar, Pilar Valderamma, Thomas G Wilson, Danieli C Rodrigues
BACKGROUND: Titanium (Ti) dominates as the material of choice for dental implant systems. Recently, titanium-zirconium alloy (TiZr) and zirconia (ZrO₂ ) have emerged as alternative materials due to higher mechanical strength and lower corrosion susceptibility. Oral pathogenic bacteria can colonize Ti surfaces, leading to surface degradation, which has yet to be investigated on TiZr and ZrO2 . The aim of this study was to compare in vitro oral bacterial adhesion and subsequent surface degradation on commercial Ti, TiZr, and ZrO2 implants...
August 13, 2018: Journal of Periodontology
https://www.readbyqxmd.com/read/30102242/novel-zno-nio-janus-nanofibers-for-effective-photocatalytic-degradation
#5
Yangxiu Liu, Jin Jia, Yan Li, Jing Hao, Kai Pan
In recent years, Janus materials have become a research hotspot in the field of materials science, however fabricating inorganic Janus nanofibers (NFs) is still a challenge. Herein, we reported a novel ZnO/NiO Janus NFs with efficient photocatalytic performance via electrospinning method followed by calcination treatment. The morphology, structure, chemical composition, and crystallinity of ZnO/NiO Janus NFs were studied in detail via SEM, TEM, HRTEM, EDS, FT-IR, XPS and XRD, indicating that the NFs had perfect Janus structure composed of ZnO and NiO...
August 13, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30101793/biogas-from-mono-and-co-digestion-of-microalgal-biomass-grown-on-piggery-wastewater
#6
P Carminati, D Gusmini, A Pizzera, A Catenacci, K Parati, E Ficara
Biogas production has been suggested as a valid valorization solution for microalgal/bacteria biomass (MAB) grown on wastewater. This research is aimed at assessing the feasibility to use MAB grown in an outdoor raceway fed on piggery wastewater for biogas production. Batch and continuous anaerobic tests were conducted on the sole MAB and on a blend of MAB and carbonaceous substrates (deproteinated cheese whey and cellulose) to improve the carbon/nitrogen ratio. Results of batch biochemical methane potential tests confirmed that the sole microalgal/bacteria biomass was poorly degradable (119 NmLCH4 ·gCOD -1 ), while blending it with deproteinated cheese whey or cellulose (80% of carbonaceous material and 20% of MAB, as chemical oxygen demand (COD)) had no synergistic effects on the methane yield, although slight improvements in the degradation kinetics were observed...
August 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30101772/zero-valent-iron-nanoparticles-for-methylene-blue-removal-from-aqueous-solutions-and-textile-wastewater-treatment-with-cost-estimation
#7
Ahmed Hamdy, Mohamed K Mostafa, Mahmoud Nasr
Nanoscale zero-valent iron (nZVI) particles were investigated for the removal of methylene blue (MB) from aqueous solutions and the treatment of textile industry effluents. The nZVI material was characterized by XRD, TEM, EDS, FTIR, and SEM. It was demonstrated that several functional groups such as C-H, C = C, C-C, and C-O contributed to MB reduction. At initial MB concentration of 70 mg/L, the optimum pH was 6, achieving a removal efficiency of 72.1% using an nZVI dosage of 10 g/L, stirring rate of 150 rpm, and temperature of 30 °C within 30 min...
August 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30101443/2d-phosphorene-epitaxial-growth-and-interface-engineering-for-electronic-devices
#8
REVIEW
Jia Lin Zhang, Cheng Han, Zehua Hu, Li Wang, Lei Liu, Andrew T S Wee, Wei Chen
Black phosphorus (BP), first synthesized in 1914 and rediscovered as a new member of the family of 2D materials in 2014, combines many extraordinary properties of graphene and transition-metal dichalcogenides, such as high charge-carrier mobility, and a tunable direct bandgap. In addition, it displays other distinguishing properties, e.g., ambipolar transport and highly anisotropic properties. The successful application of BP in electronic and optoelectronic devices has stimulated significant research interest in other allotropes and alloys of 2D phosphorene, a class of 2D materials consisting of elemental phosphorus...
August 13, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30100630/umbelliferone-instability-during-an-analysis-involving-its-extraction-process
#9
Andrzej L Dawidowicz, Katarzyna Bernacik, Rafał Typek
Umbelliferone (7-hydroxycoumarin) is one of the most popular compounds of the coumarins family. This compound receives the attention of scientists due to its diverse bioactivities in a number of applications in various therapeutic fields. An interesting aspect of umbelliferone is its structural lability. The enzymatic degradation process of umbelliferone to its hydroxylated (esculetin), glucosylated (skimmin), and methylated (herniarin) derivatives is already known from the literature. In this paper, we describe the possibility of umbelliferone transformation to other derivatives...
2018: Monatshefte Für Chemie
https://www.readbyqxmd.com/read/30099606/do-grazers-respond-to-or-control-food-quality-cross-scale-analysis-of-algivorous-fish-in-littoral-lake-tanganyika
#10
Renalda N Munubi, Peter B McIntyre, Yvonne Vadeboncoeur
Food quality determines the growth rate of primary consumers and ecosystem trophic efficiencies, but it is not clear whether variation in primary consumer densities control, or is controlled by, variation in food quality. We quantified variation in the density and condition of an abundant algae-eating cichlid, Tropheus brichardi, with respect to the quality and productivity of algal biofilms within and across rocky coastal sites in Lake Tanganyika, East Africa. Adjacent land use and sediment deposition in the littoral zone varied widely among sites...
August 12, 2018: Oecologia
https://www.readbyqxmd.com/read/30099362/in-situ-synthesis-of-rgo-zno-nanocomposite-for-demonstration-of-sunlight-driven-enhanced-photocatalytic-and-self-cleaning-of-organic-dyes-and-tea-stains-of-cotton-fabrics
#11
Partha Kumbhakar, Ashim Pramanik, Subrata Biswas, Arup Kanti Kole, Rajat Sarkar, Pathik Kumbhakar
Recently, research activities are focused on development of 2D reduced graphene oxide (rGO) based semiconductor nanocomposite materials for boosting up its catalytic applications. In this work, a rarely reported green synthesis approach has been envisioned to synthesize in-situ 2D rGO-ZnO (rGZn) nanocomposites from Apple juice and zinc acetate. Also the composition of the samples has been optimized to achieve high photocatalytic and self-cleaning properties by the formation of reactive oxidation species. The samples are characterized for their microstructural, optical absorption and photoluminescence properties...
July 29, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30099356/antibacterial-biocompatible-arginine-functionalized-mono-layer-graphene-no-more-risk-of-silver-toxicity
#12
A R Rafieerad, A R Bushroa, Ahmad Amiri, K Kalaiselvam, K M Vellasamy, J Vadivelu
Antibacterial ability is vital in biological approaches as well as functional biomaterials. Besides, cytocompatibility aspect of biologic media, tissue and organs is always concern for appropriate synthesis. From the past, metallic/oxide phases of silver (Ag) material in various macro, micro or nano configurations have been widely used for antibacterial targets. While, background of Ag toxicity within particle, film and composites is posing gradual ion release affected by molecular bounding. Recent researches conducted to control, optimize and neutralize Ag limitations finding the benefits of ideal (∼ 100%) mediation against both Gram-negative and Gram-positive bacteria...
July 31, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30099213/novel-approaches-for-improving-stability-of-cysteamine-formulations
#13
Phillip Dixon, Kristin Powell, Anuj Chauhan
Cystinosis is a genetic disorder that leads to the formation of cystine crystals in many organs in the body including cornea. Ocular manifestation of this disease is treated by eye drops of cysteamine which can easily oxidize into its disulfide cystamine. The rapid oxidation limits the shelf life as well the duration during which the drug can be used after opening the eye drop bottle. We evaluate two approaches of preventing the oxidation of cysteamine with the goal of increasing the time of use after opening the bottle to one month...
August 9, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/30099201/tailoring-the-subchondral-bone-phase-of-a-multi-layered-osteochondral-construct-to-support-bone-healing-and-a-cartilage-analog
#14
Alan Marionneaux, Joshua Walters, Helena Guo, Jeremy Mercuri
Focal chondral and osteochondral defects create significant pain and disability for working-aged adults. Current osteochondral repair grafts are limited in availability and often fail due to insufficient osseous support and integration. Thus, a need exists for an off-the-shelf osteochondral construct with the propensity to overcome these shortcomings. Herein, a scalable process was used to develop a multi-layered osteochondral graft with a subchondral bone (ScB) phase tailored to support bone healing and integration...
August 9, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/30098568/effect-of-nano-structural-properties-of-biomimetic-hydroxyapatite-on-osteoimmunomodulation
#15
Joanna M Sadowska, Fei Wei, Jia Guo, Jordi Guillem-Marti, Maria-Pau Ginebra, Yin Xiao
Immune cells are sensitive to the microstructural and textural properties of materials. Tuning the structural features of synthetic bone grafts could be a valuable strategy to regulate the specific response of the immune system, which in turn modulates the activity of bone cells. The aim of this study was to analyse the effect of the structural characteristics of biomimetic calcium deficient hydroxyapatite (CDHA) on the innate immune response of macrophages and the subsequent impact on osteogenesis and osteoclastogenesis...
July 31, 2018: Biomaterials
https://www.readbyqxmd.com/read/30097770/the-endosomal-network-mediators-and-regulators-of-endosome-maturation
#16
Maria Podinovskaia, Anne Spang
Endocytosis is a means for the cell to sample its environment for nutrients and regulate plasma membrane (PM) composition and area. Whereas the majority of internalized cargo is recycled back to the cell surface, select material is sent to the lysosome for degradation. Endosomes further play major roles in central cell activities as diverse as establishment of cell polarity and signaling, lysosomal storage and immunity. The complexity of endosomal functions is reflected by the extensive changes to endosome properties as they mature...
2018: Progress in Molecular and Subcellular Biology
https://www.readbyqxmd.com/read/30097514/reconstitution-reveals-ykt6-as-the-autophagosomal-snare-in-autophagosome-vacuole-fusion
#17
Levent Bas, Daniel Papinski, Mariya Licheva, Raffaela Torggler, Sabrina Rohringer, Martina Schuschnig, Claudine Kraft
Autophagy mediates the bulk degradation of cytoplasmic material, particularly during starvation. Upon the induction of autophagy, autophagosomes form a sealed membrane around cargo, fuse with a lytic compartment, and release the cargo for degradation. The mechanism of autophagosome-vacuole fusion is poorly understood, although factors that mediate other cellular fusion events have been implicated. In this study, we developed an in vitro reconstitution assay that enables systematic discovery and dissection of the players involved in autophagosome-vacuole fusion...
August 10, 2018: Journal of Cell Biology
https://www.readbyqxmd.com/read/30096825/lifetime-prediction-of-polymers-to-bet-or-not-to-bet-is-this-the-question
#18
Ignazio Blanco
Polymers are a great and very important category of organic compounds that have changed our lifestyle. In the last eighty years, we have used them for the most varied applications, and from the first structural ones we began to investigate their durability, which can be fatal in the successful completion of the application for which the material was designed. Over the last thirty years, the environmental problems related to the disposal of polymers that have completed their lifecycle have begun to arise, and the need to foresee their end of life has become increasingly urgent...
August 8, 2018: Materials
https://www.readbyqxmd.com/read/30096773/histologic-and-histomorphometric-analysis-of-bone-regeneration-with-bovine-grafting-material-after-24-months-of-healing-a-case-report
#19
Renzo Guarnieri, Fabrizio Belleggia, Patricia DeVillier, Luca Testarelli
Anorganic bovine bone mineral matrix (ABBMM) has been reported to have osteoconductive properties and no inflammatory or adverse responses when used as grafting material in sinus augmentation procedures. However, controversy remains in regard to degradation rate of ABBMM. The aim of this study was to histologically and histomorphometrically evaluate the degradation of ABBMM in human bone samples obtained in one patient 24 months after sinus augmentation. MATERIALS AND METHODS: The histologic and histomorphometric analysis was performed by means of light microscopy in three specimens harvested from the same patient, Results: After 24 months the tissue pattern appeared to be composed of residual particles, some in close contact with the newly formed bone, others separated by translucent areas and osteoid tissues...
August 8, 2018: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/30096694/reactive-photo-fenton-ceramic-membranes-synthesis-characterization-and-antifouling-performance
#20
Shaobin Sun, Hong Yao, Wanyi Fu, Likun Hua, Guangshan Zhang, Wen Zhang
To develop reactive and antifouling membrane filtration systems, a photo-Fenton ceramic membrane was prepared by coating goethite (α-FeOOH) catalysts on a zirconia/titania alumina membrane via a cross-linking method. Scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD) and Fourier transform infrared spectroscopy (FTIR) were used to characterize α-FeOOH catalysts and the surface coating quality. The cross linker yielded stable covalent binding between catalyst and membrane under room temperature and produced a homogeneous and smooth coating of catalyst on ceramic membranes...
August 4, 2018: Water Research
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