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https://www.readbyqxmd.com/read/28821875/convenient-and-effective-icgylation-of-magnetic-nanoparticles-for-biomedical-applications
#1
Hye Sun Park, Jongwoo Kim, Mi Young Cho, Hyunseung Lee, Sang Hwan Nam, Yung Doug Suh, Kwan Soo Hong
Nanoprobes used for biomedical applications usually require surface modifications with amphiphilic surfactants or inorganic coating materials to enhance their biocompatibility. We proposed a facile synthetic approach for the phase transfer of hydrophobic magnetic nanoparticles by the direct adherence of fluorescent probes, without any chemical modifications, for use as a magnetic resonance (MR)/near-infrared (NIR) fluorescence bimodal imaging contrast agent. Indocyanine green (ICG) was used not only as an optical component for NIR imaging, but also as a surfactant for phase transfer with no superfluous moiety: we therefore called the process "ICGylation"...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821349/advances-and-challenges-in-the-rheology-of-concentrated-emulsions-and-nanoemulsions
#2
REVIEW
Ha Seong Kim, Thomas G Mason
We review advances that have been made in the rheology of concentrated emulsions and nanoemulsions, which can serve as model soft materials that have highly tunable viscoelastic properties at droplet volume fractions near and above the glass transition and jamming point. As revealed by experiments, simulations, and theoretical models, interfacial and positional structures of droplets can depend on the applied flow history and osmotic pressure that an emulsion has experienced, thereby influencing its key rheological properties such as viscoelastic moduli, yield stress and strain, and flow behavior...
July 5, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28821158/synthesis-characterization-bioactivity-and-potential-application-of-phenolic-acid-grafted-chitosan-a-review
#3
REVIEW
Jun Liu, Huimin Pu, Shuang Liu, Juan Kan, Changhai Jin
In recent years, increasing attention has been paid to the grafting of phenolic acid onto chitosan in order to enhance the bioactivity and widen the application of chitosan. Here, we present a comprehensive overview on the recent advances of phenolic acid grafted chitosan (phenolic acid-g-chitosan) in many aspects, including the synthetic method, structural characterization, biological activity, physicochemical property and potential application. In general, four kinds of techniques including carbodiimide based coupling, enzyme catalyzed grafting, free radical mediated grafting and electrochemical methods are frequently used for the synthesis of phenolic acid-g-chitosan...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821071/on-the-use-of-ion-crosslinked-nanocellulose-hydrogels-for-wound-healing-solutions-physicochemical-properties-and-application-oriented-biocompatibility-studies
#4
Alex Basu, Jonas Lindh, Eva Ålander, Maria Strømme, Natalia Ferraz
Calcium ion-crosslinked nanofibrillated cellulose (NFC) hydrogels were investigated as potential materials for wound healing dressings. The physicochemical properties of the hydrogels were examined by rheology and water retention tests. Skin cells and monocytes were selected for application-oriented biocompatibility studies. The NFC hydrogels presented entangled fibrous networks and solid-like behavior. Water retention tests showed the material´s potential to maintain a suitable moist environment for different type of wounds...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820602/intricate-resonant-raman-response-in-anisotropic-res2
#5
Amber McCreary, Jeffrey R Simpson, Yuanxi Wang, Daniel Rhodes, Kazunori Fujisawa, Luis Balicas, Madan Dubey, Vincent H Crespi, Mauricio Terrones, Angela R Hight Walker
The strong in-plane anisotropy of rhenium disulfide (ReS2) offers an additional physical parameter that can be tuned for advanced applications such as logic circuits, thin-film polarizers, and polarization-sensitive photodetectors. ReS2 also presents advantages for optoelectronics, as it is both a direct-gap semiconductor for few-layer thicknesses (unlike MoS2 or WS2) and stable in air (unlike black phosphorus). Raman spectroscopy is one of the most powerful characterization techniques to non-destructively and sensitively probe the fundamental photo-physics of a 2D material...
August 18, 2017: Nano Letters
https://www.readbyqxmd.com/read/28819688/airway-reconstruction-using-decellularized-tracheal-allografts-in-a-porcine-model
#6
Michinobu Ohno, Yasushi Fuchimoto, Huai-Che Hsu, Masataka Higuchi, Makoto Komura, Tetsuji Yamaoka, Akihiro Umezawa, Shin Enosawa, Tatsuo Kuroda
PURPOSE: Tracheal cartilage reconstruction is an essential approach for the treatment of tracheal congenital abnormalities or injury. Here, we evaluated the use of allogeneic decellularized tracheas as novel support scaffolds. METHODS: Six weaned pigs (4-week-old domestic males) were transplanted with allogeneic tracheal graft patches (three decellularized and three fresh tracheal scaffolds) onto artificial defects (approximately 15 × 15 mm). After 11 weeks, the tracheas were evaluated by bronchoscopy and histological studies...
August 17, 2017: Pediatric Surgery International
https://www.readbyqxmd.com/read/28819399/outcomes-of-cancer-therapy-administered-to-treatment-na%C3%A3-ve-lung-cancer-patients-in-the-intensive-care-unit
#7
Yen-Fu Chen, Jou-Wei Lin, Chao-Chi Ho, Ching-Yao Yang, Chia-Hao Chang, Tao-Min Huang, Chung-Yu Chen, Kuan-Yu Chen, Jin-Yuan Shih, Chong-Jen Yu
Objectives: Therapy outcomes for newly diagnosed, critically ill lung cancer patients have seldom been evaluated. This study evaluated therapy outcomes for treatment-naïve lung cancer patients in the intensive care unit (ICU). Materials and Methods: Patients were excluded if they had previously received lung cancer treatment, such as systemic chemotherapy, targeted therapy, radiotherapy, or surgical lung resection before ICU admission. The therapeutic strategies for the treatment-naïve patients were determined while they were in the ICU...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28819068/rural-emergency-care-360%C3%A2-mobilising-healthcare-professionals-decision-makers-patients-and-citizens-to-improve-rural-emergency-care-in-the-province-of-quebec-canada-a-qualitative-study-protocol
#8
Richard Fleet, Gilles Dupuis, Jean-Paul Fortin, Jocelyn Gravel, Mathieu Ouimet, Julien Poitras, France Légaré
INTRODUCTION: Emergency departments (EDs) are an important safety net for rural populations. Results of our earlier studies suggest that rural Canadian hospitals have limited access to advanced imaging services and intensive care units and that patients are transferred over large distances. They also revealed significant geographical variations in rural services. In the absence of national standards, our studies raise questions about inequities in rural access to emergency services and the risks for citizens...
August 17, 2017: BMJ Open
https://www.readbyqxmd.com/read/28818798/advances-towards-understanding-and-engineering-direct-interspecies-electron-transfer-in-anaerobic-digestion
#9
REVIEW
Sajib Barua, Bipro Ranjan Dhar
Direct interspecies electron transfer (DIET) is a recently discovered microbial syntrophy where cell-to-cell electron transfer occurs between syntrophic microbial species. DIET between bacteria and methanogenic archaea in anaerobic digestion can accelerate the syntrophic conversion of various reduced organic compounds to methane. DIET-based syntrophy can naturally occur in some anaerobic digester via conductive pili, however, can be engineered via the addition of various non-biological conductive materials...
August 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28818656/synthesis-and-liquid-liquid-extraction-of-non-agglomerated-al-oh-3-particles-for-deposition-of-cellulose-matrix-composite-films
#10
T Zhang, X Zhao, R Poon, A Clifford, R Mathews, I Zhitomirsky
A cathodic electrophoretic deposition (EPD) method has been developed for the deposition of quaternized hydroxyethyl cellulose ethoxylate (QHECE) films. A quartz crystal microbalance was used for in-situ investigation of the deposition yield in dilute QHECE solutions. The deposition rate increased with increasing QHECE concentration in the range of 1-10gL(-1). Aluminium hydroxide (AH) was prepared by a chemical precipitation method and used as a flame retardant additive for QHECE. AH particle agglomeration was avoided by a new strategy, based on combined synthesis and liquid-liquid extraction method...
August 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28818310/fracture-analysis-of-tube-boiler-for-physical-explosion-accident
#11
Eui Soo Kim
Material and failure analysis techniques are key tools for determining causation in case of explosive and bursting accident result from material and process defect of product in the field of forensic science. The boiler rupture generated by defect of the welding division, corrosion, overheating and degradation of the material have devastating power. If weak division of boiler burner is fractured by internal pressure, saturated vapor and water is vaporized suddenly. At that time, volume of the saturated vapor and water increases up to thousands of volume...
August 3, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28817381/advanced-radiation-dosimetry-phantom-ardos-a-versatile-breathing-phantom-for-4d-radiation-therapy-and-medical-imaging
#12
Natalia Kostiukhina, Dietmar Georg, Sofia Rollet, Peter Kuess, Andrej Sipaj, Piotr Andrzejewski, Hugo Furtado, Ivo Rausch, Wolfgang Lechner, Elisabeth Steiner, Hunor Kertesz, Barbara Knaeusl
A novel breathing phantom was designed for being used in conventional and ion-beam radiotherapy as well as for medical imaging. Accurate dose delivery and patient safety are aimed to be verified for four-dimensional (4D) treatment techniques compensating for breathing-induced tumor motion. The phantom includes anthropomorphic components representing an average human thorax. It consists of real tissue equivalent materials to fulfill the requirements for dosimetric experiments and imaging purposes. The different parts of the torso (lungs, chest wall, and ribs) and the tumor can move independently...
August 17, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28817344/a-guide-to-approaching-regulatory-considerations-for-lentiviral-mediated-gene-therapies
#13
Michael White, Roger Whittaker, Carolina Gándara, Elizabeth A Stoll
Lentiviral vectors are increasingly the gene transfer tool of choice for gene or cell therapies, with multiple clinical investigations showing promise for this viral vector in terms of both safety and efficacy. The third-generation vector system is well characterized, effectively delivers genetic material and maintains long-term stable expression in target cells, delivers larger amounts of genetic material than other methods, is nonpathogenic, and does not cause an inflammatory response in the recipient. This report aims to help academic scientists and regulatory managers negotiate the governance framework to achieve successful translation of a lentiviral vector-based gene therapy...
August 2017: Human Gene Therapy Methods
https://www.readbyqxmd.com/read/28817258/synthesis-of-complex-glycolates-by-enantioconvergent-addition-reactions
#14
Samuel L Bartlett, Jeffrey S Johnson
The unique role that stereochemistry plays in molecular recognition events continues to provide a driving force for synthesizing organic compounds in enantioenriched form. The tendency of enantioenriched organic compounds to revert to an entropically favored racemic state in the presence of viable racemization pathways (e.g., the enolization of stereogenic carbonyl derivatives) can sometimes interfere with this objective; however, beginning with Noyori's foundational disclosure of a dynamic kinetic transfer hydrogenation, the ability to channel racemic, configurationally labile starting materials through stereoconvergent reaction pathways has been recognized as a powerful strategy in asymmetric synthesis...
August 17, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28817257/cation-anion-arrangement-patterns-in-self-assembled-pd2l4-and-pd4l8-coordination-cages
#15
Guido H Clever, Philip Punt
Compounds featuring one-dimensional regular arrangements of stacked metal complexes and alternating [cation-anion]∞ sequences have raised considerable interest owing to their peculiar electronic and optical properties as well as guest inclusion capabilities. While traditional ways to realize these structural motifs rely on crystalline compounds, exclusively existing in the solid state, recent progress in the area of metal-mediated supramolecular self-assembly allows for the rational synthesis of structurally well-defined short stretches of stacked metal complexes and cation-anion arrangements...
August 17, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28817126/principles-for-vertical-ridge-augmentation-in-the-atrophic-posterior-mandible-a-technical-review
#16
Istvan A Urban, Alberto Monje, Jaime Lozada, Hom-Lay Wang
Guided bone regeneration has become more predictable due to advances in material sciences. Nevertheless, vertical ridge augmentation (VRA) remains a potential challenge due to the complexity of soft tissue management. This becomes more complicated in the posterior atrophic mandible due to limited access and poorer blood supply. As such, a number of critical elements must be taken into consideration in treatment planning. Anatomical structures potentially jeopardize intraoperative adverse events such as bleeding or neurosensory disturbances...
September 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28816051/lipid-stabilized-water-oil-interfaces-studied-by-micro-focusing-small-angle-x-ray-scattering
#17
Emanuela Di Cola, Kristian Torbensen, Ilaria Clemente, Federico Rossi, Sandra Ristori, Ali Abou-Hassan
Water in oil (w/o) simple emulsions are dispersed micro-confined systems which find applications in many areas of advanced materials and biotechnology, such as food industry, drug delivery and cosmetics, to name but a few. In these systems, the structural and chemical properties of the boundary layer at the w/o interface are of paramount importance to determine functionality and stability. Recently, microfluidic methods have emerged as a valuable tool to fabricate monodisperse emulsion droplets. Due to the intrinsic flexibility of microfluidics, different interfaces can be obtained, and general principles governing the interfacial stability are needed to guide the experimental approach...
August 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28816043/electronic-muscles-and-skins-a-review-of-soft-sensors-and-actuators
#18
Dustin Chen, Qibing Pei
This article reviews several classes of compliant materials that can be utilized to fabricate electronic muscles and skins. Different classes of materials range from compliant conductors, semiconductors, to dielectrics, all of which play a vital and cohesive role in the development of next generation electronics. This paper covers recent advances in the development of new materials, as well as the engineering of well-characterized materials for the repurposing in applications of flexible and stretchable electronics...
August 17, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28815932/polymer-based-hybrid-nanocomposites-a-progress-toward-enhancing-interfacial-interaction-and-tailoring-advanced-applications
#19
REVIEW
Chang-Sik Ha
Organic/inorganic hybrid nanocomposites, in particular polymer based hybrid nanocomposites, constitute emerging advanced materials since they combine unique properties from the inorganic and organic (i. e. polymeric) components. We investigated three different hybrid nanocomposites depending on dimensions of the dispersed phase in the nanometer range,; polymer-layered silicate (PLS) nanocomposites where polymers are mixed with layered silicates, polymer/graphene oxide hybrid nanocomposites, and polymer hybrid nanocomposites with reinforcing polymers with isodimensional phases of inorganic silicas using sol-gel reactions...
August 17, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28815887/viologens-and-their-application-as-functional-materials
#20
Laura Striepe, Thomas Baumgartner
Organic materials have recently gained considerable attention for electronic applications, improving performance and sustainability to current technologies. Commercialized metal-based systems are generally expensive, toxic and difficult to recycle, however organic materials offer promising solutions. Viologens, N,N' di-quaternized bipyridyl salts, are a well-studied species exhibiting three reversible redox states, possessing valuable electrochromic and electron-accepting properties. These properties can be fine-tuned through synthesis by altering the nitrogen substituents and various counteranions...
August 16, 2017: Chemistry: a European Journal
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