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https://www.readbyqxmd.com/read/29353096/modification-of-aspergillus-niger-by-conducting-polymer-polypyrrole-and-the-evaluation-of-electrochemical-properties-of-modified-cells
#1
Roxana-Mihaela Apetrei, Geta Carac, Gabriela Bahrim, Almira Ramanaviciene, Arunas Ramanavicius
The enhancement of bioelectrochemical properties of microorganism by in situ formation of conducting polymer within the cell structures (e.g. cell wall) was performed. The synthesis of polypyrrole (Ppy) within fungi (Aspergillus niger) cells was achieved. Two different Aspergillus niger strains were selected due to their ability to produce glucose oxidase, which initiated the Ppy formation through products of enzymatic reaction. The evolution of Ppy structural features was investigated by absorption spectroscopy, cyclic voltammetry and Fourier transform infrared spectroscopy...
January 6, 2018: Bioelectrochemistry
https://www.readbyqxmd.com/read/29348573/exendin-4-encapsulated-dissolving-microneedle-arrays-for-efficient-treatment-of-type-2-diabetes
#2
Shayan Fakhraei Lahiji, Yoojung Jang, Inyoung Huh, Huisuk Yang, Mingyu Jang, Hyungil Jung
Dissolving microneedles (DMNs) are microscopic needles capable of delivering encapsulated compounds and releasing them into the skin in a minimally invasive manner. Most studies indicate that encapsulating therapeutics in DMNs is an efficacious approach; however, the importance of evaluating the activity of encapsulated compounds, during the fabrication process, has not been examined in detail. Conducting an analysis of thermal, chemical, and physical stress factors, including temperature, pH, and the interaction of the polymer and therapeutics mixture during preparation, is essential for retaining the activity of encapsulated therapeutics during and after fabrication...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29346024/occurrence-of-polycyclic-aromatic-hydrocarbons-in-surface-water-and-hospital-wastewater
#3
Ayrton F Martins, Daiane S da Silva, Alma C C Mejía, José E B Bravo
The main objective of this study was to determine the occurrence of polycyclic aromatic hydrocarbons (PAHs) in surface water samples collected from different points along the stream that flows through the Campus of the Federal University of Santa Maria, RS-Brazil. Before reaching the campus, the water in the stream is already contaminated by wastewater discharged from the surrounding, and once inside the Campus, additional wastewater from a Gas Station situated close to the University hospital. A bench scale photodegradation experiment was conducted of the occurring traces of anthracene, phenanthrene and naphthalene, with the aid of a stirred tank reactor and polymer-supported TiO2 as a catalyst...
January 18, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29345899/three-dimensional-graphene-foam-polymer-composite-with-superior-deicing-efficiency-and-strength
#4
Jenniffer Bustillos, Cheng Zhang, Benjamin Boesl, Arvind Agarwal
The adhesion of ice severely compromises the aerodynamic performance of aircrafts operating under critically low-temperature conditions to their surfaces. In this study, highly thermally and electrically conductive graphene foam polymer composite is fabricated. GrF - polydimethylsiloxane (PDMS) deicing composite exhibit superior deicing efficiency of 477 % and electrical conductivities of 500 S∙m-1 with only 0.1 vol. % Graphene foam addition as compared to other nanocarbon - based deicing systems. The three-dimensional interconnected architecture of GrF allows the effective deicing of surfaces by employing low power densities (0...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29345628/reversibility-and-intermediate-steps-as-key-tools-for-the-growth-of-extended-ordered-polymers-via-on-surface-synthesis
#5
Marco Di Giovannantonio, Giorgio Contini
Surface-confined polymerization is a bottom-up strategy to create one- and two-dimensional covalent organic nanostructures with a π-conjugated backbone, which are suitable to be employed in real-life electronic devices, due to their high mechanical resistance and electronic charge transport efficiency. This strategy makes it possible to change the properties of the final nanostructures by a careful choice of the monomer architecture (<i>i.e.</i> of its constituent atoms and their spatial arrangement)...
January 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29342881/development-of-self-assembled-nanoribbon-bound-peptide-polyaniline-composite-scaffolds-and-their-interactions-with-neural-cortical-cells
#6
Andrew M Smith, Harrison T Pajovich, Ipsita A Banerjee
Degenerative neurological disorders and traumatic brain injuries cause significant damage to quality of life and often impact survival. As a result, novel treatments are necessary that can allow for the regeneration of neural tissue. In this work, a new biomimetic scaffold was designed with potential for applications in neural tissue regeneration. To develop the scaffold, we first prepared a new bolaamphiphile that was capable of undergoing self-assembly into nanoribbons at pH 7. Those nanoribbons were then utilized as templates for conjugation with specific proteins known to play a critical role in neural tissue growth...
January 13, 2018: Bioengineering
https://www.readbyqxmd.com/read/29336836/current-status-of-tissue-engineering-applied-to-bladder-reconstruction-in-humans
#7
C Gasanz, C Raventós, J Morote
CONTEXT AND OBJECTIVE: Bladder reconstruction is performed to replace or expand the bladder. The intestine is used in standard clinical practice for tissue in this procedure. The complications of bladder reconstruction range from those of intestinal resection to those resulting from the continuous contact of urine with tissue not prepared for this contact. In this article, we describe and classify the various biomaterials and cell cultures used in bladder tissue engineering and reviews the studies performed with humans...
January 11, 2018: Actas Urologicas Españolas
https://www.readbyqxmd.com/read/29336615/pharmacokinetic-bioequivalence-safety-and-acceptability-of-ornibel%C3%A2-a-new-polymer-composition-contraceptive-vaginal-ring-etonogestrel-ethinylestradiol-11-00-3-474%C3%A2-mg-compared-with-nuvaring%C3%A2-etonogestrel-ethinylestradiol-11-7-2-7%C3%A2-mg
#8
Jaime Algorta, Maria Diaz, Raquel de Benito, Marc Lefebvre, Eric Sicard, Milton Furtado, Pedro Antonio Regidor, Celestino Ronchi
OBJECTIVE: To show the clinical development of Ornibel® (ExeltisHealthcare, Spain) a contraceptive vaginal ring manufactured with a new polymer composition and containing etonogestrel/ethinylestradiol, compared to Nuvaring® (MSD, Spain). SUBJECTS AND METHODS: Randomised, single dose, 2-period, 2-sequence, 2-stage crossover, comparative bioavailability study conducted in 40 healthy female subjects. All subjects received both treatments for 28 days in each of two periods, separated by a 28 days washout...
January 16, 2018: European Journal of Contraception & Reproductive Health Care
https://www.readbyqxmd.com/read/29336351/microwave-absorption-properties-of-reduced-graphene-oxide-strontium-hexaferrite-poly-methyl-methacrylate-composites
#9
Snaghmitra Acharya, Jayashree Ray, T Umasankar Patro, Prashant Alegaonkar, Suwarna Datar
To design microwave absorber material for eradication of electromagnetic (EM) pollution the key factors are; absorption of incident EM wave and good impedance matching. By keeping these things in mind, flexible microwave absorber composite films are fabricated by simple gel casting techniques by considering reduced graphene oxide (RGO) and strontium ferrite (SF) in poly (methyl methacrylate) (PMMA) matrix. SF nanoparticles are synthesized by well known sol-gel method. Subsequently, reduced graphene oxide (RGO) and SF nanocomposite (RGOSF) are prepared through chemical reduction method by using hydrazine...
January 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29334812/anti-biofilm-effect-of-a-butenolide-polymer-coating-and-metatranscriptomic-analyses
#10
Wei Ding, Chunfeng Ma, Weipeng Zhang, Hoyin Chiang, Chunkit Tam, Ying Xu, Guangzhao Zhang, Pei-Yuan Qian
Butenolide is an environmentally friendly antifouling natural product, but its efficiency and mechanism in preventing biofilm formation have not been examined. Furthermore, controlling the release of butenolide from paints into seawater is technically challenging. A coating was developed by mixing butenolide with a biodegradable polymer, poly (ε-caprolactone)-based polyurethane, and a one-month in situ anti-biofilm test was conducted in a subtidal area. The constant release of butenolide from the surface suggested that its release was well controlled...
January 2018: Biofouling
https://www.readbyqxmd.com/read/29334456/building-ion-conduction-highways-in-polymeric-electrolytes-by-manipulating-protein-configuration
#11
Xuewei Fu, Chunhui Li, Yu Wang, Lucas Paul Kovatch, Louis Scudiero, Jin Liu, Wei-Hong Zhong
Solid polymer electrolytes play a critical role in the development of safe, flexible and all-solid-state energy storage devices. However, the low ion-conductivity has been the primary challenge impeding them from practical applications. Here, we propose a new biotechnology to fabricate novel protein-ceramic hybrid nanofillers for simultaneously boosting the ionic conductivity, mechanical properties and even adhesion properties of solid polymer electrolytes. This hybrid nanofiller is fabricated by coating ion-conductive soy-proteins onto TiO2 nanoparticles via a controlled denaturation process in appropriate solvent and conditions...
January 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29334225/the-fate-of-poly-3-octylthiophene-transducer-in-solid-contact-ion-selective-electrodes
#12
Ewa Jaworska, Maciej Mazur, Krzysztof Maksymiuk, Agata Michalska
An experimental approach allowing visualization and quantification of underestimated spontaneous process of partition of conducting polymer transducer material to the ion-selective membrane phase is proposed. The approach proposed is based on optical properties of the transducer material applied, using polythiophene as a model system. It is shown that this process occurs not only during sensor preparation step but also during pretreatment of the sensor before use. As shown, this uncontrolled partition of the transducer to the receptor leads to conducting polymer contents in the membrane phase reaching 0...
January 15, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29334219/mussel-inspired-conductive-polymer-binder-for-si-alloy-anode-in-lithium-ion-batteries
#13
Hui Zhao, Yang Wei, Cheng Wang, Rui-Min Qiao, Wanli Yang, Phillip B Messersmith, Gao Liu
The excessive volume changes during cell cycling of Si-based anode in lithium ion batteries impeded its application. One major reason for the cell failure is particle isolation during volume shrinkage in delithiation process, which makes strong adhesion between polymer binder and anode active material particles a highly desirable property. Here, a biomimetic side-chain conductive polymer incorporating catechol, a key adhesive component of the mussel holdfast protein, was synthesized. Atomic force microscopy (AFM) based single molecule force measurements of mussel-inspired conductive polymer binder contacting a silica surface revealed similar adhesion toward substrate when compared with an effective Si anode binder, homo-polyacrylic acid (PAA), with the added benefit of being electronically conductive...
January 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29332837/a-novel-electroanalytical-assay-for-sulfamethazine-determination-in-food-samples-based-on-conducting-polymer-nanocomposite-modified-electrodes
#14
Ya-Ling Su, Shu-Hua Cheng
The toxicity of sulfa drugs has attracted great attention, and the reported electrochemical methods for sulfa drugs usually employ a high oxidation potential. In this work, a one-pot synthesized conducting polymer nanocomposite containing poly(3,4-ethylenedioxythiophene) (PEDOT) and MnO2 was cast on a screen-printed carbon electrode (SPCE), and the modified electrode showed superior electrochemical activity over a bare electrode for sulfamethazine (SMZ) determination. The SMZ detection was based on the electrochemical oxidation product, which showed an adsorptive property and exhibited a redox couple at 0...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29331134/coarse-grained-model-of-nanoscale-segregation-water-diffusion-and-proton-transport-in-nafion-membranes
#15
Aleksey Vishnyakov, Runfang Mao, Ming-Tsung Lee, Alexander V Neimark
We present a coarse-grained model of the acid form of Nafion membrane that explicitly includes proton transport. This model is based on a soft-core bead representation of the polymer implemented into the dissipative particle dynamics (DPD) simulation framework. The proton is introduced as a separate charged bead that forms dissociable Morse bonds with water beads. Morse bond formation and breakup artificially mimics the Grotthuss hopping mechanism of proton transport. The proposed DPD model is parameterized to account for the specifics of the conformations and flexibility of the Nafion backbone and sidechains; it treats electrostatic interactions in the smeared charge approximation...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29330452/assessment-of-the-responses-of-soil-pore-properties-to-combined-soil-structure-amendments-using-x-ray-computed-tomography
#16
Yonghui Yang, Jicheng Wu, Shiwei Zhao, Qingyuan Han, Xiaoying Pan, Fang He, Chun Chen
Soil amendments, such as straw mulch, organic fertilizers and superabsorbent polymer (SAP), are extensively applied to improve soil structure and porosity, and we reported the functional consequences of the individual application of these amendments in our previous study. However, whether combined amendments are more effective than their individual applications for improving soil pore structure is unknown. Here, we conducted X-ray computed tomography (CT) scanning on undisturbed soil columns to investigate the efficiency of two-amendment application, including straw mulch and organic manure, SAP and organic manure, or SAP and straw mulch, for improving soil pore properties and pore distribution...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29329014/nanoadsorbents-based-on-conducting-polymer-nanocomposites-with-main-focus-on-polyaniline-and-its-derivatives-for-removal-of-heavy-metal-ions-dyes-a-review
#17
REVIEW
Ehsan Nazarzadeh Zare, Ahmad Motahari, Mika Sillanpää
Water contamination by toxic heavy metal ions and dyes remains a serious public health problem for humans, so attention on specific methods and technologies to remove heavy metal ions and dyes from wastewaters/aqueous solutions are desired. Numerous adsorbents have been reported for the removal of heavy metal ions/dyes from wastewaters/aqueous solutions. Polyaniline (PANI) and its derivatives, as conducting polymers, are good adsorbents to remove various kinds of heavy metal ions and dyes from wastewaters/aqueous solutions...
January 9, 2018: Environmental Research
https://www.readbyqxmd.com/read/29328714/experimental-observation-of-two-features-unexpected-from-the-classical-theories-of-rubber-elasticity
#18
Kengo Nishi, Kenta Fujii, Ung-Il Chung, Mitsuhiro Shibayama, Takamasa Sakai
Although the elastic modulus of a Gaussian chain network is thought to be successfully described by classical theories of rubber elasticity, such as the affine and phantom models, verification experiments are largely lacking owing to difficulties in precisely controlling of the network structure. We prepared well-defined model polymer networks experimentally, and measured the elastic modulus G for a broad range of polymer concentrations and connectivity probabilities, p. In our experiment, we observed two features that were distinct from those predicted by classical theories...
December 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29328672/three-dimensional-printing-hollow-polymer-template-mediated-graphene-lattices-with-tailorable-architectures-and-multifunctional-properties
#19
Qiangqiang Zhang, Feng Zhang, Xiang Xu, Chi Zhou, Dong Lin
It is a significant challenge to concurrently achieve scalable fabrication of graphene aerogels with three-dimensional (3D) tailorable architectures (e.g., lattice structure) and controllable manipulation of microstructures on the multiscale. Herein, we highlight 3D graphene lattices (GLs) with complex engineering architectures that were delicately designed and manufactured via 3D stereolithography printed hollow polymer template-mediated hydrothermal process coupled with freeze-drying strategies. The resulting GLs with overhang beams and columns show a 3D geometric configuration with hollow-carved features at the macroscale, while the construction elements of graphene cellular on the microscale exhibit a well-ordered and honeycomb-like microstructure with high porosity...
January 12, 2018: ACS Nano
https://www.readbyqxmd.com/read/29328079/high-resolution-coherent-x-ray-diffraction-imaging-of-metal-coated-polymer-microspheres
#20
Eirik T B Skjønsfjell, David Kleiven, Nilesh Patil, Yuriy Chushkin, Federico Zontone, Alain Gibaud, Dag W Breiby
Coherent x-ray diffraction imaging (CXDI) is becoming an important 3D quantitative microscopy technique, allowing structural investigation of a wide range of delicate mesoscale samples that cannot be imaged by other techniques like electron microscopy. Here we report high-resolution 3D CXDI performed on spherical microcomposites consisting of a polymer core coated with a triple layer of nickel-gold-silica. These composites are of high interest to the microelectronics industry, where they are applied in conducting adhesives as fine-pitch electrical contacts-which requires an exceptional degree of uniformity and reproducibility...
January 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
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