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https://www.readbyqxmd.com/read/28650630/waterborne-electrospinning-of-poly-n-isopropyl-acrylamide-by-control-of-environmental-parameters
#1
Ella Schoolaert, Paulien Ryckx, Jozefien Geltmeyer, Samarendra Maji, Paul H M Van Steenberge, Dagmar R D'hooge, Richard Hoogenboom, Karen De Clerck
With increasing toxicity and environmental concerns, electrospinning from water, i.e. waterborne electrospinning, is crucial to further exploit the resulting nanofiber potential. Most water-soluble polymers have the inherent limitation of resulting in water-soluble nanofibers and a tedious chemical cross-linking step is required to reach stable nanofibers. An interesting alternative route is the use of thermoresponsive polymers, such as poly(N-isopropyl acrylamide) (PNIPAM), as they are water-soluble beneath their lower critical solution temperature (LCST) allowing low temperature electrospinning while the obtained nanofibers are water-stable above the LCST...
June 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28649573/supramolecular-self-assembly-of-a-model-hydrogelator-characterization-of-fiber-formation-and-morphology
#2
Yuan Gao, Ryan Nieuwendaal, Emilios K Dimitriadis, Boualem Hammouda, Jack F Douglas, Bing Xu, Ferenc Horkay
Hydrogels are of intense recent interest in connection with biomedical applications ranging from 3-D cell cultures and stem cell differentiation to regenerative medicine, controlled drug delivery and tissue engineering. This prototypical form of soft matter has many emerging material science applications outside the medical field. The physical processes underlying this type of solidification are incompletely understood and this limits design efforts aimed at optimizing these materials for applications. We address this general problem by applying multiple techniques (e...
December 2016: Gels
https://www.readbyqxmd.com/read/28649458/physico-chemical-rheological-and-antioxidant-properties-of-sweet-chestnut-castanea-sativa-mill-as-affected-by-pan-and-microwave-roasting
#3
Idrees Ahmed Wani, Humaira Hamid, Afshan Mumtaz Hamdani, Adil Gani, Bilal Ahmad Ashwar
Sweet chestnut (Castanea sativa Mill.) belongs to the family Fagaceae and sub family Castaneoideae. Bioactive components such as tannins are present in sweet chestnut in high proportion giving astringent bitter taste and reducing their palatability. Roasting reduces the anti-nutritional factors in chestnut. This study was conducted to compare the effects of pan and microwave roasting on physicochemical, functional, rheological and antioxidant properties of sweet chestnut. Antioxidant activity was determined using DPPH inhibition activity, reducing power, and total phenolic content...
July 2017: Journal of Advanced Research
https://www.readbyqxmd.com/read/28649402/evolutionary-adaptations-of-biofilms-infecting-cystic-fibrosis-lungs-promote-mechanical-toughness-by-adjusting-polysaccharide-production
#4
Kristin Kovach, Megan Davis-Fields, Yasuhiko Irie, Kanishk Jain, Shashvat Doorwar, Katherine Vuong, Numa Dhamani, Kishore Mohanty, Ahmed Touhami, Vernita D Gordon
Biofilms are communities of microbes embedded in a matrix of extracellular polymeric substances, largely polysaccharides. Multiple types of extracellular polymeric substances can be produced by a single bacterial strain. The distinct polymer components of biofilms are known to provide chemical protection, but little is known about how distinct extracellular polysaccharides may also protect biofilms against mechanical stresses such as shear or phagocytic engulfment. Decades-long infections of Pseudomonas. aeruginosa biofilms in the lungs of cystic fibrosis patients are natural models for studies of biofilm fitness under pressure from antibiotics and the immune system...
2017: NPJ Biofilms and Microbiomes
https://www.readbyqxmd.com/read/28648689/gaining-thermodynamic-insight-from-distinct-glass-formation-kinetics-of-structurally-similar-organic-compounds
#5
Arjun Kalra, Paul Luner, Lynne S Taylor, Stephen R Byrn, Tonglei Li
Thermodynamic and kinetic aspects of crystallization of 12 structurally similar organic compounds were investigated from the supercooled liquid state by calorimetric and rheological measurements. Based on their crystallization behaviors, these compounds were divided into three categories: stable glass formers, poor glass formers, and good glass formers with poor stability on reheating. Correlation was sought between thermodynamic quantities and glass formation based on nucleation and crystal growth theories...
June 22, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28647778/a-correlation-between-secondary-structure-and-rheological-properties-of-low-density-lipoproteins-at-air-water-interfaces
#6
Ziad Khattari
The secondary structure of apolipoprotein B-100 is studied within the bulk phase and at the air/water interface. In these "in viro" experiments, infrared reflection absorption spectroscopy (IRRAS) study was performed at the air/water interface while circular dichroism (CD) was conducted in the bulk phase. In the bulk phase, the conformational structure containing a significant amount of β-structure, whereas varying amount of α-helix, unordered structures, and β-sheet were observed at the air/water interface depending on the low-density lipoprotein (LDL) film interfacial pressure...
June 24, 2017: Journal of Biological Physics
https://www.readbyqxmd.com/read/28647329/structural-changes-induced-by-high-pressure-processing-in-micellar-casein-and-milk-protein-concentrates
#7
Lee Cadesky, Markus Walkling-Ribeiro, Kyle T Kriner, Mukund V Karwe, Carmen I Moraru
Reconstituted micellar casein concentrates and milk protein concentrates of 2.5 and 10% (wt/vol) protein concentration were subjected to high-pressure processing at pressures from 150 to 450 MPa, for 15 min, at ambient temperature. The structural changes induced in milk proteins by high-pressure processing were investigated using a range of physical, physicochemical, and chemical methods, including dynamic light scattering, rheology, mid-infrared spectroscopy, scanning electron microscopy, proteomics, and soluble mineral analyses...
June 21, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28646332/a-rational-approach-for-the-improvement-of-biomass-production-and-lipid-profile-in-cacao-cell-suspensions
#8
Adriana María Gallego Rúa, Luisa Fernanda Rojas, Aura Ines Urrea Trujillo, Oriana Parra Zuleta, Cristian David Correa Alvarez, Lucía Atehortúa Garcés
Cocoa butter (CB) is produced in the seeds of Theobroma cacao representing 50% of its dry weight. The lipid composition plays an important role in the physicochemical, rheological, and sensory properties of the CB, making this fat a valuable resource for the production of chocolates, cosmetics, and pharmaceuticals. In this paper, are described experimental strategies used for a rational improvement of biomass production and fatty acids in cacao cell suspension cultures. First, the lipid profile in four cacao varieties is characterized, and then, one variety is selected to induce cell suspensions using a direct method without previous establishment of a callus phase...
June 23, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28646093/emerging-roles-of-mechanical-forces-in-chromatin-regulation
#9
REVIEW
Yekaterina A Miroshnikova, Michele M Nava, Sara A Wickström
Cells are constantly subjected to a spectrum of mechanical cues, such as shear stress, compression, differential tissue rigidity and strain, to which they adapt by engaging mechanisms of mechanotransduction. While the central role of cell adhesion receptors in this process is established, it has only recently been appreciated that mechanical cues reach far beyond the plasma membrane and the cytoskeleton, and are directly transmitted to the nucleus. Furthermore, changes in the mechanical properties of the perinuclear cytoskeleton, nuclear lamina and chromatin are critical for cellular responses and adaptation to external mechanical cues...
June 23, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28645493/sprayable-carbopol-hydrogel-with-soluble-beta-1-3-1-6-glucan-as-an-active-ingredient-for-wound-healing-development-and-in-vivo-evaluation
#10
Jostein Grip, Rolf Einar Engstad, Ingrid Skjæveland, Nataša Škalko-Basnet, Ann Mari Holsæter
Chronic wounds represent a significant health problem worldwide. There is a need for advanced- and cost-efficient wound healing products able to increase patient comfort and reduce the healing time. The aim of this study was to develop a sprayable hydrogel dressing with beta-glucan (βG) as the active ingredient, targeting future application in the treatment of both chronic and burn wounds. The βG was chosen as an active ingredient because of its promising wound healing capabilities, whereas Carbopol 971P NF (Carbopol) was chosen as the thickening agent in the formulation due to several attractive characteristics such as its low viscosity, low toxicity, high transparency and good ion tolerance...
June 20, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28642908/methodologies-for-measuring-the-setting-times-of-mineral-trioxide-aggregate-and-portland-cement-products-used-in-dentistry
#11
William Nguyen Ha, Timothy Nicholson, Bill Kahler, Laurence James Walsh
Objective The current standard used to measure setting time for Mineral Trioxide Aggregate (MTA) involves indentation testing with arbitrary weights. This study compared indentation testing against rheological measurements and assessed the influences of particle size and the inclusion of bismuth oxide on the setting time of experimental MTA and Portland cement (PC). Material and methods Two PCs (P1 and P2) of different particle sizes were produced using the same clinker. From these two PCs, two experimental MTAs (M1 and M2) were created with the addition of bismuth oxide...
December 2016: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28642044/crossregulation-between-the-insertion-of-hexadecylphosphocholine-miltefosine-into-lipid-membranes-and-their-rheology-and-lateral-structure
#12
Yenisleidy de Las Mercedes Zulueta Díaz, María Laura Fanani
Hexadecylphosphocholine (HePC, miltefosine) is an alkylphospholipid used clinically for the topical treatment of cancer and against leishmaniasis. The mechanism of action of HePC, not yet elucidated, involves its insertion into the plasma membrane, affecting lipid homeostasis. It has also been proposed that HePC directly affects lipid raft stability and function in cell membranes. The present work deals with two main questions in the understanding of the action of HePC: the bases for membrane selectivity and as a membrane perturbator agent...
June 19, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28642041/interaction-of-polyhedral-oligomeric-silsesquioxanes-and-dipalmitoylphosphatidylcholine-at-the-air-water-interface-thermodynamic-and-rheological-study
#13
M Skrzypiec, G As Georgiev, M Rojewska, K Prochaska
Polyhedral oligomeric silsesquioxanes (POSS) derivatives containing open silsesquioxane cage bear great potential for biomedical applications and therefore their lateral interactions with phospholipids, major biomembranes and drug vehicles constituent, should be studied in detail. That is why the properties of surface films by two POSS-derivatives, POSS-polyethylene glycol (POSS-PEG) and POSS-perfluoroalkyl (POSS-OFP), pure and in presence of 1,2-dipalmitoyl-sn-glycerol-3-phosphocholine (DPPC) were studied using Langmuir surface balance...
June 19, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28639943/bioprintable-form-of-chitosan-hydrogel-for-bone-tissue-engineering
#14
T Tolga Demirtas, Gülseren Irmak, Menemse Gumusderelioglu
Bioprinting can be defined as the 3D patterning of living cells and other biologics by using a computer-aided layer-by-layer deposition approach. Presence of cells within the ink to usage of a "bio-ink" presents the potential to print of living tissues and organ analogs that can be implanted into damaged/diseased tissue to promote highly controlled cell-based regeneration. In this study, it was shown for the first time that chitosan solution and its composite with nanostructured bone-like hydroxyapatite (HA) can be mixed with cells and printed successfully...
June 22, 2017: Biofabrication
https://www.readbyqxmd.com/read/28639337/partially-acetylated-or-benzoylated-arabinose-derivatives-as-structurally-simple-organogelators-effect-of-the-ester-protecting-group-on-gel-properties
#15
Rajkamal Rajkamal, Navendu P Pathak, Tanmoy Halder, Shubhajit Dhara, Somnath Yadav
Sugar based low molecular weight gelators (LMWGs) have been used for various applications since long time. In this work, we report structurally simple, ester protected arabinosides as low molecular weight organogelators (LMOGs) that are able to gel aromatic solvents as well as petrol and diesel. Studies on the mechanical strength of the gels through detailed rheological experiments indicate that the gels from the 1,2-dibenzoylated arabinose gelator possesses better mechanical properties than the 1,2-diacetylated gelator...
June 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28639068/what-about-the-rheological-properties-of%C3%A2-prp-microfat-mixtures-in-fat-grafting-procedure
#16
R Ghazouane, B Bertrand, C Philandrianos, J Veran, M Abellan, P Francois, M Velier, C Orneto, P Piccerelle, J Magalon
BACKGROUND: Fat grafting has emerged as a reference procedure in daily plastic surgery practice. Unpredictable fat resorption is the main clinical problem. For this purpose, the addition of PRP to enhance fat revascularization is now an easy and popular procedure. However, no consensus exists regarding the respective volume of fat and PRP used to obtain the ideal mixture. This study investigated the rheological properties of microfat mixed with different proportions of PRP. Results obtained were compared with commercialized hyaluronic acid fillers...
June 21, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28638899/surface-cleaning-of-artworks-structure-and-dynamics-of-nanostructured-fluids-confined-in-polymeric-hydrogel-networks
#17
Rosangela Mastrangelo, Costanza Montis, Nicole Bonelli, Paolo Tempesti, Piero Baglioni
Nanosystems and confinement tools for the controlled release of a cleaning agent, e.g., hydrogels and microemulsions, have been used for several years for the treatment of delicate surfaces in art restoration interventions. However, notwithstanding the unprecedented achievements from an application point of view, a fundamental comprehension of their interaction mechanism is still lacking. In this study PVA hydrogels, obtained via freeze-thaw processes, are prepared as scaffolds for water-based nanostructured fluids for application in the cleaning of artworks: rheological, thermal, microscopic and scattering techniques showed that, depending on the number of freeze-thaw cycles, the hydrogels exhibit different physicochemical and viscoelastic properties, making them suitable for application in a broad range of cleaning issues...
June 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28633849/effects-of-bovine-serum-albumin-on-a-single-cavitation-bubble
#18
Shuibao Qi, Badreddine Assouar, Weizhong Chen
The dynamics and sonoluminescence (SL) of a single cavitation bubble in bovine serum albumin (BSA) aqueous solutions have been experimentally and theoretically investigated. A phase-locked integral imaging has been used to record the bubble pulsation evolutions. The results show that, under the optimum driving condition, the endurable driving pressure, maximum radius, radius compression ratio and SL intensity of the cavitation bubble increase correspondingly with the increase of BSA concentrations within the critical micelle concentration, which indicates that the addition of BSA increases the power capability of the cavitation bubble...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633824/ultrasound-assisted-extraction-of-polysaccharides-from-rhododendron-aganniphum-antioxidant-activity-and-rheological-properties
#19
Xiao Guo, Xiaofei Shang, Xuzheng Zhou, Baotang Zhao, Jiyu Zhang
In this study, we aimed to optimize the extraction of polysaccharides from the leaves of Rhododendron aganniphum and investigate its rheological properties and antioxidant activity. After optimizing the operating parameters using a Box-Behnken design (BBD), the results showed that the optimal ultrasound-assisted extraction conditions were as follows: extraction temperature, 55°C; liquid-solid ratio, 25:1; extraction time, 2.2h; and ultrasound treatment power, 200W. The optimized experimental yield of polysaccharides by ultrasound-assisted extraction (PUAE) was 9...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633822/effects-of-pulsed-ultrasound-on-rheological-and-structural-properties-of-chicken-myofibrillar-protein
#20
Jing-Yu Wang, Yu-Ling Yang, Xiao-Zhi Tang, Wen-Xi Ni, Lei Zhou
The effects of pulsed ultrasound (PUS) (power: 240w) with varying time (0, 3, 6, 9, 12 and 15min) on rheological and structural properties of chicken myofibrillar protein (CMP) were examined. PUS treatment significantly caused a decrease in the viscosity coefficients (k) but an increase in the flow index (n) value of CMP solutions within short time (0-6min), while had no significant effect for longer time (9-15min). Besides, at 6min, the solubility and microstructure of CMP samples were optimum. The primary structure of CMP was not altered by PUS treatment...
September 2017: Ultrasonics Sonochemistry
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