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https://www.readbyqxmd.com/read/29352928/thermo-sensitive-injectable-glycol-chitosan-based-hydrogel-for-treatment-of-degenerative-disc-disease
#1
Zhengzheng Li, Hyeeun Shim, Myeong Ok Cho, Ik Sung Cho, Jin Hyun Lee, Sun-Woong Kang, Bosun Kwon, Kang Moo Huh
The use of injectable hydrogel formulations have been suggested as a promising strategy for the treatment of degenerative disc disease to both restore the biomechanical function and reduce low back pain. In this work, a new thermo-sensitive injectable hydrogels with tunable thermo-sensitivity and enhanced stability were developed with N-hexanoylation of glycol chitosan (GC) for treatment of degenerative disc disease, and their physico-chemical and biological properties were evaluated. The sol-gel transition temperature of the hydrogels was controlled in a range of 23-56 °С, depending on the degree of hexanoylation and the polymer concentration...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352911/hpmcas-as-an-effective-precipitation-inhibitor-in-amorphous-solid-dispersions-of-the-poorly-soluble-drug-candesartan-cilexetil
#2
Juliana Munari Oliveira Pinto, Aline Franciane Leão, Manoela Klüppel Riekes, Maria Terezinha França, Hellen Karine Stulzer
Among the strategies to improve the biopharmaceutic properties of poorly soluble drugs, Supersaturating Drug Delivery Systems like polymer-based amorphous solid dispersions (SD) have been successfully applied. The screening of appropriate polymeric carriers to compose SD is a crucial point on their development. In this study, hydroxypropylmethylcellulose (HPMC), hydroxypropylmethylcellulose acetate succinate (HPMCAS) types L, M and H and polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymer (SOL) were evaluated by in vitro supersaturation studies regarding their anti-precipitant ability on the poorly soluble drug candesartan cilexetil (CC) under two different media, including biorelevant conditions...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352885/synthesis-of-stimuli-responsive-chitosan-based-hydrogels-by-diels-alder-cross-linking-click%C3%A2-reaction-as-potential-carriers-for-drug-administration
#3
O Guaresti, C García-Astrain, R H Aguirresarobe, A Eceiza, N Gabilondo
Stimuli-responsive chitosan-based hydrogels for biomedical applications using the Diels-Alder reaction were prepared. Furan modified chitosan (Cs-Fu) was cross-linked with polyetheramine derived bismaleimide at different equivalent ratios in order to determine the effect in the swelling and release properties on the final CsFu:BMI hydrogels. The Diels Alder cross-linking reaction was monitored by UV-vis spectroscopy and rheological measurements. Both the sol-gel transition value and the final storage modulus for the different formulations were similar and close to 40 min and 400 Pa, respectively...
March 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29350918/entrapped-styrene-butadiene-polymer-chains-by-sol-gel-derived-silica-nanoparticles-with-hierarchical-raspberry-structures
#4
Sankar Raman Vaikuntam, Klaus Werner Stöckelhuber, Eshwaran Subramani Bhagavatheswaran, Sven Wiessner, Ulrich Scheler, Kay Saalwaechter, Petr Formanek, Gert Heinrich, Amit Das
A sol-gel transformation of liquid silica precursor to solid silica particles was carried out in a one pot synthesis way where a solution of styrene butadiene elastomer (S-SBR) was present. The composites, thus produced, offered remarkable improvements of mechanical and dynamic mechanical performances as compared with precipitated silica. The morphological analysis reveals that the alkoxy-based silica particles resemble a raspberry structure when the synthesis of the silica was carried out in presence of polymer molecules and represent a much more open silica-network structure...
January 19, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29350029/a-microwell-array-method-for-rapid-generation-of-uniform-agarose-droplets-and-beads-for-single-molecule-analysis
#5
Xingrui Li, Dongfeng Zhang, Huimin Zhang, Zhichao Guan, Yanling Song, Ruochen Liu, Zhi Zhu, Chaoyong James Yang
Compartmentalization of aqueous samples in uniform emulsion droplets has proven to be a useful tool for many chemical, biological, and biomedical applications. Herein, we introduce an array-based emulsification method for rapid and easy generation of monodisperse agarose-in-oil droplets in a PDMS microwell array. The microwells are filled with agarose solution, and subsequent addition of hot oil results in immediate formation of agarose droplets due to the surface-tension of the liquid solution. Because droplet size is determined solely by the array unit dimensions, uniform droplets with pre-selectable diameters ranging from 20 µm to 100 µm can be produced with relative standard deviations less than 3...
January 19, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29349865/superfast-room-temperature-activation-of-sno2-thin-films-via-atmospheric-plasma-oxidation-and-their-application-in-planar-perovskite-photovoltaics
#6
Haejun Yu, Hye-In Yeom, Jong Woo Lee, Kisu Lee, Doyk Hwang, Juyoung Yun, Jaehoon Ryu, Jungsup Lee, Sohyeon Bae, Seong Keun Kim, Jyongsik Jang
The power conversion efficiency (PCE) of perovskite solar cells (PSCs) has now exceeded 20%; thus, research focus has shifted to establishing the foundations for commercialization. One of the pivotal themes is to curtail the overall fabrication time, to reduce unit cost, and mass-produce PSCs. Additionally, energy dissipation during the thermal annealing (TA) stage must be minimized by realizing a genuine low-temperature (LT) process. Here, tin oxide (SnO2 ) thin films (TFs) are formulated at extremely high speed, within 5 min, under an almost room-temperature environment (<50 °C), using atmospheric Ar/O2 plasma energy (P-SnO2 ) and are applied as an electron transport layer of a "n-i-p"-type planar PSC...
January 19, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29349818/nanocrystalline-precursors-for-the-co-assembly-of-crack-free-metal-oxide-inverse-opals
#7
Katherine R Phillips, Tanya Shirman, Elijah Shirman, Anna V Shneidman, Theresa M Kay, Joanna Aizenberg
Inorganic microstructured materials are ubiquitous in nature. However, their formation in artificial self-assembly systems is challenging as it involves a complex interplay of competing forces during and after assembly. For example, colloidal assembly requires fine-tuning of factors such as the size and surface charge of the particles and electrolyte strength of the solvent to enable successful self-assembly and minimize crack formation. Co-assembly of templating colloidal particles together with a sol-gel matrix precursor material helps to release stresses that accumulate during drying and solidification, as previously shown for the formation of high-quality inverse opal (IO) films out of amorphous silica...
January 19, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29349783/development-of-cotton-fabrics-with-durable-uv-protective-and-self-cleaning-property-by-deposition-of-low-tio2-levels-through-sol-gel-process
#8
Anu Mishra, Bhupendra Singh Butola
In this article, the deposition of TiO2 on cotton fabric using sol-gel techniques has been described. Various process routes (pad-dry-cure, pad-dry-hydrothermal and pad-dry-solvothermal) were examined to impart a stable coating of TiO2 on fabric. The role of pre-cursor concentration, process temperature and time of treatment were studied to aim at a wash durable, UV protective and self-cleaning property in the treated fabric. EDX and ICP-MS techniques were used to examine the add-on % of TiO2 on cotton fabrics treated via different routes...
January 19, 2018: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29349585/molecularly-imprinted-core-shell-cdse-sio2-cds-as-a-ratiometric-fluorescent-probe-for-4-nitrophenol-sensing
#9
Mingyue Liu, Zhao Gao, Yanjun Yu, Rongxin Su, Renliang Huang, Wei Qi, Zhimin He
4-Nitrophenol (4-NP) is a priority pollutant in water and is both carcinogenic and genotoxic to humans and wildlife even at very low concentrations. Thus, we herein fabricated a novel molecularly imprinted core-shell nanohybrid as a ratiometric fluorescent sensor for the highly sensitive and selective detection of 4-NP. This sensor was functioned by the transfer of fluorescence resonance energy between photoluminescent carbon dots (CDs) and 4-NP. This sensor was synthesized by linking organosilane-functionalized CDs to silica-coated CdSe quantum dots (CdSe@SiO2) via Si-O bonds...
January 18, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29348804/lysine-analogue-of-polymyxin-b-as-a-significant-opportunity-for-photodynamic-antimicrobial-chemotherapy
#10
Florent Le Guern, Tan-Sothea Ouk, Catherine Ouk, Regis Vanderesse, Yves Champavier, Emilie Pinault, Vincent Sol
In order to highlight the potential of photodynamic antimicrobial chemotherapy in case of infections by antibiotic resistant-strains, a new antimicrobial peptide conjugate has been synthesized, consisting of a derivative of polymyxin B and a cationic porphyrin covalently attached together to a spacer. A polymyxin-derived moiety was subjected to a primary structural modification in the replacement of four diaminobutyrate residues with lysine ones. This modification was done in order to strongly reduce bactericidal activity, with the aim to eliminate the potential rise of polymyxin-resistant strains...
January 11, 2018: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29346268/effect-of-novel-quercetin-titanium-dioxide-decorated-multi-walled-carbon-nanotubes-nanocomposite-on-bacillus-subtilis-biofilm-development
#11
Diana S Raie, Eisha Mhatre, Doaa S El-Desouki, Ahmed Labena, Gamal El-Ghannam, Laila A Farahat, Tareq Youssef, Wolfgang Fritzsche, Ákos T Kovács
The present work was targeted to design a surface against cell seeding and adhering of bacteria, Bacillus subtilis. A multi-walled carbon nanotube/titanium dioxide nano-power was produced via simple mixing of carbon nanotube and titanium dioxide nanoparticles during the sol-gel process followed by heat treatment. Successfully, quercetin was immobilized on the nanocomposite via physical adsorption to form a quercetin/multi-walled carbon nanotube/titanium dioxide nanocomposite. The adhesion of bacteria on the coated-slides was verified after 24 h using confocal laser-scanning microscopy...
January 18, 2018: Materials
https://www.readbyqxmd.com/read/29345945/chitosan-silica-hybrid-composites-for-removal-of-sulfonated-azo-dyes-from-aqueous-solutions
#12
Magdalena Blachnio, Tetyana M Budnyak, Anna Derylo-Marczewska, Adam W Marczewski, Valentin A Tertykh
In this study, the influence of chitosan immobilization method on properties of final hybrids materials was performed. Chitosan immobilized on the surface of mesoporous (ChS2) and fumed silica (ChS3) by physical adsorption and through sol-gel method (ChS1). It was found that physical immobilization of chitosan allow to obtain hybrid composites (ChS) with homogeneous distribution of polymer on the surface, relatively wide pores and specific surface area about 170 m2/g, pHPZC=5.7 for ChS3 and 356 m2/g, pHPZC=6...
January 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29345272/preparation-of-eu-iii-acetylacetonate-doped-well-defined-titania-particles-with-efficient-photoluminescence-properties
#13
Kota Shiba, Takuya Kataoka, Motohiro Tagaya
The aggregation/dispersion of luminescent species is a critical factor that determines their luminescence properties. In this study, europium(iii) acetylacetonate (Eu(acac)3) was doped into a titania matrix to form Eu(acac)3-doped titania particles with well-defined size and shape through a microreactor-based sol-gel approach. The morphology and structure of the as-synthesized products were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy and X-ray diffraction measurements...
January 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29343079/cultural-factors-and-oral-health-related-quality-of-life-among-dentate-adults-hispanic-community-health-study-study-of-latinos
#14
Marushka L Silveira, Bruce A Dye, Timothy J Iafolla, Margo R Adesanya, Shahdokht Boroumand, Marston E Youngblood, Christian R Salazar, Tracy L Finlayson, Tasneem Khambaty, Shirley M Beaver, A Isabel Garcia
OBJECTIVE: Research on the relationships between acculturation, ethnic identity, and oral health-related quality of life (OHRQOL) among the U.S. Hispanic/Latino population is sparse. The aim of this study is to examine the association between acculturation, ethnic identity, and OHRQOL among 13,172 adults in the 2008-2011 Hispanic Community Health Study/Study of Latinos (HCHS/SOL). DESIGN: Participants self-reported their acculturation (immigrant generation, birthplace, residence in the U...
January 18, 2018: Ethnicity & Health
https://www.readbyqxmd.com/read/29342860/aunps-hybrid-black-zno-nanorods-made-by-a-sol-gel-method-for-highly-sensitive-humidity-sensing
#15
Hongyan Zhang, Min Zhang, Cunchong Lin, Jun Zhang
A highly sensitive self-powered humidity sensor has been realized from AuNPs hybrid black zinc oxide (ZnO) nanorods prepared through a sol-gel method. XRD pattern reveals that both ZnO and ZnO/AuNPs exhibit a wurtzite structure. ZnO/AuNPs nanorods grow in a vertical alignment, which possesses high uniformity and forms dense arrays with a smaller diameter than that of ZnO nanoparticles. All ZnO/AuNPs and pure black ZnO show lower band gap energy than the typically reported 3.34 eV of pure ZnO. Furthermore, the band gap of ZnO/AuNPs nanocomposites is effectively influenced by the amount of AuNPs...
January 13, 2018: Sensors
https://www.readbyqxmd.com/read/29340386/on-chip-functional-neuroimaging-with-mechanical-stimulation-in-caenorhabditis-elegans-larvae-for-studying-development-and-neural-circuits
#16
Yongmin Cho, David N Oakland, Sol Ah Lee, William R Schafer, Hang Lu
Mechanosensation is fundamentally important for the abilities of an organism to experience touch, hear sounds, and maintain balance. Caenorhabditis elegans is a powerful system for studying mechanosensation as this worm is well suited for in vivo functional imaging of neurons. Many years of research using labor-intensive methods have generated a wealth of knowledge about mechanosensation in C. elegans, and the recent microfluidic-based platforms continue to push the boundary for this field. However, developmental aspects of sensory biology, including mechanosensation, are still not fully understood...
January 17, 2018: Lab on a Chip
https://www.readbyqxmd.com/read/29339519/evidence-for-convergent-evolution-of-sine-directed-staufen-mediated-mrna-decay
#17
Bronwyn A Lucas, Eitan Lavi, Lily Shiue, Hana Cho, Sol Katzman, Keita Miyoshi, Mikiko C Siomi, Liran Carmel, Manuel Ares, Lynne E Maquat
Primate-specific Alu short interspersed elements (SINEs) as well as rodent-specific B and ID (B/ID) SINEs can promote Staufen-mediated decay (SMD) when present in mRNA 3'-untranslated regions (3'-UTRs). The transposable nature of SINEs, their presence in long noncoding RNAs, their interactions with Staufen, and their rapid divergence in different evolutionary lineages suggest they could have generated substantial modification of posttranscriptional gene-control networks during mammalian evolution. Some of the variation in SMD regulation produced by SINE insertion might have had a similar regulatory effect in separate mammalian lineages, leading to parallel evolution of the Staufen network by independent expansion of lineage-specific SINEs...
January 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29339288/hyaluronic-acid-in-pluronic-f-127-f-108-hydrogels-for-postoperative-pain-in-arthroplasties-influence-on-physico-chemical-properties-and-structural-requirements-for-sustained-drug-release
#18
M H M Nascimento, M K K D Franco, F Yokaichyia, E de Paula, C B Lombello, D R de Araujo
In this study, we reported the hyaluronic acid (HA) on supramolecular structure of Pluronic F-127 (PLF-127) and/or Pluronic F-108 (PLF-127) hydrogels, as well as their effects on release mechanisms, looking forward their application as lidocaine (LDC) drug-delivery systems in arthroplastic surgeries. We have studied the HA-micelle interaction using Dynamic Light Scattering (DLS), the micellization and sol-gel transition processes by Differential Scanning Calorimetry (DSC) and Rheology., of PL-based hydrogels and...
January 12, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29338799/going-it-alone-a-scoping-review-of-unbefriended-older-adults
#19
Stephanie Chamberlain, Sol Baik, Carole Estabrooks
Older adults who have reduced decision-making capacity and no family or friends to compensate for these deficiencies are known as unbefriended and require a public guardian. The purpose of this study was to review the peer-reviewed and grey literature to determine the scope of available research on unbefriended older adults in Canada and the United States. We found limited research examining unbefriended older adults. No Canadian studies or reports were located. Unbefriended older adults were childless or had fewer children, were more cognitively impaired, and were older than older adults who were not unbefriended...
January 17, 2018: Canadian Journal on Aging, la Revue Canadienne du Vieillissement
https://www.readbyqxmd.com/read/29338217/unprecedented-synergistic-effects-of-nanoscale-nutrients-on-growth-productivity-of-sweet-sorghum-sorghum-bicolor-l-moench-and-nutrient-biofortification
#20
Naseeruddin Ramapuram, Sumathi V, Nvkv Prasad Tollamadugu, P Sudhakar, Chandrika V, Balam Ravindra Reddy
Evidence based synergistic effects of nanoscale materials (size <100 nm in at least one dimension) were scantly documented in agriculture at field scale. Herein, we report for the first time on effects of nanoscale zinc oxide (n-ZnO), calcium oxide (n-CaO) and magnesium oxide (n-MgO) on growth and productivity of sweet sorghum (Sorghum bicolor (L.) Moench). Modified sol-gel method was used to prepare nanoscale materials under study. Characterization was done using Electron microscopy (TEM & SEM), X-ray diffraction (XRD) and dynamic light scattering (DLS)...
January 16, 2018: Journal of Agricultural and Food Chemistry
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