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https://www.readbyqxmd.com/read/28926942/the-semi-synthetic-peptide-lin-sb056-1-in-combination-with-edta-exerts-strong-antimicrobial-and-antibiofilm-activity-against-pseudomonas-aeruginosa-in-conditions-mimicking-cystic-fibrosis-sputum
#1
Giuseppantonio Maisetta, Lucia Grassi, Semih Esin, Ilaria Serra, Mariano A Scorciapino, Andrea C Rinaldi, Giovanna Batoni
Pseudomonas aeruginosa is a major cause of chronic lung infections in cystic fibrosis (CF) patients. The ability of the bacterium to form biofilms and the presence of a thick and stagnant mucus in the airways of CF patients largely contribute to antibiotic therapy failure and demand for new antimicrobial agents able to act in the CF environment. The present study investigated the anti-P. aeruginosa activity of lin-SB056-1, a recently described semi-synthetic antimicrobial peptide, used alone and in combination with the cation chelator ethylenediaminetetraacetic acid (EDTA)...
September 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28926885/-evaluation-of-short-term-effect-of-intense-pulsed-light-combined-with-meibomian-gland-expression-in-the-treatment-of-meibomian-gland-dysfunction
#2
B Rong, P Tu, Y Tang, R X Liu, W J Song, X M Yan
Objective: To explore short-term effect of intense pulsed light (IPL) combined with meibomian gland expression in treating meibomian gland dysfunction (MGD). Methods: This study was a prospective, randomized, double-masked, controlled study. Forty-four MGD patients were enrolled in the study and received three consecutive IPL treatments with an interval of 4 weeks. One eye of each patient was randomly assigned as the study eye receiving the IPL therapy with an energy of 14-16 J/cm(2), and the fellow eye was as the control eye receiving a placebo therapy with 0 J/cm(2)...
September 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28926823/preparation-characterization-and-application-of-urease-nanoparticles-for-construction-of-an-improved-potentiometric-urea-biosensor
#3
Seema Jakhar, C S Pundir
The nanoparticles (NPs) aggregates of commercial urease from jack beans (Canavalia ensiformis) were prepared by desolvation and glutaraldehyde crosslinking and functionalized by cysteamine dihydrochloride. These enzyme nanoparticles (ENPs) were characterized by transmission electron microscopy (TEM), UV and Fourier transform infrared (FTIR) spectroscopy. The TEM images of urease NPs showed their size in the range, 18-100nm with an average of 51.2nm. The ENPs were more active and stable with a longer shelf life than native enzyme molecules...
September 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28926732/multifunctional-mesoporous-zro2-encapsulated-upconversion-nanoparticles-for-mild-nir-light-activated-synergistic-cancer-therapy
#4
Lili Feng, Shili Gai, Fei He, Yunlu Dai, Chongna Zhong, Piaoping Yang, Jun Lin
Desirable nanosystem that could not only deliver drugs safely and effectively into tumor sites, but also be expected to serve as photosensitizer to realize the photodynamic therapeutic function, would be of great significance in the synergistic cancer therapy. To perform this task, a multifunctional nanosystem has been developed for markedly enhanced cancer therapeutic efficacy by loading chemotherapy agent (doxorubicin hydrochloride, DOX) and photosensitive drug chlorin e6 (Ce6) into the channels of mesoporous zirconium dioxide (ZrO2) layer which coats on Nd(3+)-doped upconversion nanoparticles (UCNPs)...
September 13, 2017: Biomaterials
https://www.readbyqxmd.com/read/28926685/nir-absorbing-metal-free-organic-porphyrin-and-phthalocyanine-dyes-for-panchromatic-dscs
#5
Phillip Brogdon, Hammad Cheema, Jared Heath Delcamp
Dye-sensitized solar cells (DSCs) are a promising source of renewable energy. However, power conversion efficiency (PCE) of devices has been limited largely by the difficulty of producing electricity using photons from the near-infrared (NIR) spectral region. Metal-free organic sensitizers frequently employ strong electron donating or withdrawing moieties to tune the optical band gap to allow the absorption of lower energy wavelengths in charge transfer systems while porphyrins and phthalocyanines use substituents to shift the Soret and Q bands toward lower energy absorption...
September 19, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28926684/metrology-of-multiphoton-microscopes-using-second-harmonic-generation-nanoprobes
#6
Pierre Mahou, Guy Malkinson, Élodie Chaudan, Thierry Gacoin, Emmanuel Beaurepaire, Willy Supatto
In multiphoton microscopy, the ongoing trend toward the use of excitation wavelengths spanning the entire near-infrared range calls for new standards in order to quantify and compare the performances of microscopes. This article describes a new method for characterizing the imaging properties of multiphoton microscopes over a broad range of excitation wavelengths in a straightforward and efficient manner. It demonstrates how second harmonic generation (SHG) nanoprobes can be used to map the spatial resolution, field curvature, and chromatic aberrations across the microscope field of view with a precision below the diffraction limit and with unique advantages over methods based on fluorescence...
September 19, 2017: Small
https://www.readbyqxmd.com/read/28926276/polypyrrole-coated-perfluorocarbon-nanoemulsions-as-a-sono-photoacoustic-contrast-agent
#7
David Shicheng Li, Soon Joon Yoon, Ivan Pelivanov, M Frenz, Matthew O'Donnell, Lilo D Pozzo
A new contrast agent for combined photoacoustic and ultrasound imaging is presented. It has a liquid perfluorocarbon (PFC) core of about 250 nm diameter coated by a 30 nm thin polypyrrole (PPy) doped polymer shell emulsion which represents a broadband absorber covering the visible and near-infrared ranges (peak optical extinction at 1050 nm). When exposed to a sufficiently high intensity optical or acoustic pulse, the droplets vaporize to form microbubbles providing a strong increase in imaging sensitivity and specificity...
September 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28926258/matrix-isolation-studies-of-novel-intermediates-in-the-reaction-of-trimethylaluminum-with-ozone
#8
H Dushanee M Sriyarathne, Bruce S Ault
The thermal reaction of ozone with trimethyl aluminum has been explored using twin jet, concentric jet and merged jet deposition into cryogenic matrixes. Infrared spectroscopy and density functional theory calculations have been employed to identify and characterize the products formed in each case. Together, these deposition techniques provide information over the essentially full course of the gas phase reaction. At short times with twin jet deposition, the primary product is the O atom insertion product (CH3)2AlOCH3...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28926255/infrared-spectroscopic-and-theoretical-studies-on-the-omf2-and-omf-m-cr-mo-w-molecules-in-solid-argon
#9
Rui Wei, Qingnuan Li, Yu Gong, Lester Andrews, Zongtang Fang, Kanchana Sahan Thanthiriwatte, Monica Vasiliu, David A Dixon
Group 6 metal oxide fluoride molecules in the form of OMF2 and OMF (M=Cr, Mo, W) have been prepared via the reactions of laser-ablated metal atoms and OF2 in excess argon. Product identifications were carried out by using infrared spectroscopy, 18OF2 sample and electronic structure calculations. Reactions of group 6 metal atoms and OF2 resulted in the formation of ternary OCrF2, OMoF2 and OWF2 molecules with C2v symmetry in which the tetravalent metal center is coordinated by one oxygen and two fluorine atoms...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28926248/short-wave-near-infrared-linear-dichroism-of-two-dimensional-germanium-selenide
#10
Xiaoting Wang, Yongtao Li, Le Huang, Xiang-Wei Jiang, Lang Jiang, Huanli Dong, Zhongming Wei, Jingbo Li, Wenping Hu
Polarized detection has been brought into operation for optics applications in visible band. Although an advanced requirement in short-wave near-infrared (SW-NIR) (700-1100 nm) is proposed, the approaching of this target remains under way. Theoretically, IV-VI chalcogenides two-dimensional (2D) structures, e.g., 2D germanium selenide (GeSe), possess anisotropic layered orthorhombic structure, narrow 1.1-1.2eV bandgap and potentially meet the demand. Here we report the unusual angle dependences of Raman spectra on controllably synthesized high-quality 2D GeSe crystals...
September 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28926230/formation-and-characterization-of-hydrogen-boride-sheets-derived-from-mgb2-by-cation-exchange
#11
Hiroaki Nishino, Takeshi Fujita, Nguyen Thanh Cuong, Satoshi Tominaka, Masahiro Miyauchi, Soshi Iimura, Akihiko Hirata, Naoto Umezawa, Susumu Okada, Eiji Nishibori, Asahi Fujino, Tomohiro Fujimori, Shin-Ichi Ito, Junji Nakamura, Hideo Hosono, Takahiro Kondo
Two-dimensional (2D) materials are promising for applications in a wide range of fields because of their unique properties. Hydrogen boride sheets, a new 2D material recently predicted from theory, exhibit intriguing electronic and mechanical properties as well as hydrogen storage capacity. Here, we report the experimental realization of 2D hydrogen boride sheets with an empirical formula of H1B1, produced by exfoliation and complete ion-exchange between protons and magnesium cations in magnesium diboride (MgB2) with an average yield of 42...
September 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28926226/correlation-between-dissolved-protons-in-nickel-doped-bazr0-1ce0-7y0-1yb0-1o3-%C3%AE-and-its-electrical-conductive-properties
#12
Tomohiro Ishiyama, Haruo Kishimoto, Katherine Develos-Bagarinao, Katsuhiko Yamaji, Toshiaki Yamaguchi, Yoshinobu Fujishiro
The electrical conductivity of nickel (2 wt %)-doped BaZr0.1Ce0.7Y0.1Yb0.1O3-δ (BZCYYb) acceptor-doped perovskite oxide was evaluated under air and a 1% H2 atmosphere. The partial conductivity was calculated from the total conductivity and the transport number of each carrier (tH(+), tO(2-), and th(+)) obtained using the concentration cell method. Its correlation with the dissolution state of the protons in the oxide as studied by in situ diffuse reflection Fourier transform infrared spectroscopy is discussed...
September 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28926062/selectivity-of-solid-phase-extraction-for-dissolved-organic-matter-in-the-hypersaline%C3%A2-da-qaidam-lake-china
#13
Keli Yang, Yaoling Zhang, Yaping Dong, Wu Li
Dissolved organic matter (DOM) was isolated from the hypersaline Da Qaidam Lake using solid-phase extraction (SPE) methods with five different adsorbents: ENVI-Carb (non-porous graphitized carbon), HLB, PPL, and XAD-8 (polymer based), and ENVI-18 (silica based). Structure-selective assessments of SPE-DOM isolated using the different adsorbents were conducted using a combination of complementary analysis techniques, including dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) analysis, as well as elemental analysis, Fourier transformed infrared spectroscopy (FTIR), (1)H nuclear magnetic resonance ((1)H NMR) and pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS)...
September 19, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28926045/fluorite-type-coordination-compound-as-iodide-ion-conductor-crystal-structure-and-ionic-conductivity
#14
Xin Chen, Chen Xue, Shao-Xian Liu, Jian-Lan Liu, Zhi-Yuan Yao, Xiao-Ming Ren
The solid state electrolytes show a wide range of practical applications in a variety of all-solid-state electrochemical devices, and it is highly in demand to explore new types of solid state electrolyte materials. In this study, we have designed and prepared a fluorite-type coordination compound, [Mn(en)3]I2, which has been characterized by microanalysis for C, H and N elements, infrared spectrum in the wavenumber range of 4000-400 cm(-1), thermogravimetric analysis and differential scanning calorimetry. The single crystal X-ray diffraction revealed that the bigger size [Mn(en)3](2+) cations build three-dimensional network in the crystal of [Mn(en)3]I2 and the smaller size iodide ions occupy the tetrahedral or octahedral cavities surrounded by the [Mn(en)3](2+) cations, featuring as the fluorite-type compound...
September 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28925890/the-use-of-hemodynamic-and-cerebral-monitoring-to-study-pharmacodynamics-in-neonates
#15
A Smits, L Thewissen, A Dereymaeker, E Dempsey, A Caicedo, Gunnar Naulaers
BACKGROUND: Drugs acting on the cardiovascular and central nervous system often display relatively fast clinical responses, which may differ in neonates compared to children and adults. Introduction of bedside monitoring tools might be of additional value in the pharmacodynamic (PD) assessment of such drugs in neonates. METHODS: We aim to provide an overview of the frequently used monitoring tools to assess drug effects on the hemodynamic status as well as the cerebral circulation, oxygenation and cerebral metabolism in neonates...
September 18, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28925715/novel-carbon-dots-derived-from-schizonepetae-herba-carbonisata-and-investigation-of-their-haemostatic-efficacy
#16
Meiling Zhang, Yan Zhao, Jinjun Cheng, Xiaoman Liu, Yongzhi Wang, Xin Yan, Yue Zhang, Fang Lu, Qingguo Wang, Huihua Qu
Schizonepetae Herba Carbonisata (SHC) has been used in traditional Chinese medicine (TCM) to treat haemorrhagic diseases for more than 1000 years. However, little information is available on its haemostatic components and mechanism. In this study, we developed novel water-soluble carbon dots (CDs) in aqueous extracts of SHC for the first time and a modified pyrolysis method was used to prepare the SHC using Schizonepetae Herba (SH) as the sole precursor. The SHC-CDs were characterized using transmission electron microscopy (TEM), high-resolution TEM (HRTEM), Fourier transform infrared (FT-IR), ultraviolet-visible (UV-Vis) and fluorescence spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and high-performance liquid chromatography (HPLC)...
September 19, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28925701/interaction-of-co2-with-atomic-manganese-in-the-presence-of-an-excess-negative-charge-probed-by-infrared-spectroscopy-of-mn-co2-n-clusters
#17
Michael Charles Thompson, Jacob Ramsay, J Mathias Weber
We report infrared photodissociation spectra of manganese-CO2 cluster anions,[Mn(CO2)n](-) (n = 2 - 10) to probe structural motifs characterizing the interaction between Mn and CO2 in the presence of an excess electron. We interpret the experimental spectra through comparison with infrared spectra predicted from density functional theory calculations. The cluster anions consist of core ions combining a Mn atom with a variety of ligands, solvated by additional CO2 molecules. Structural motifs of ligands evolve with increasing cluster size from simple monodentate and bidentate CO2 ligands to oxalate ligands and combinations of these structural themes...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28925700/infrared-signature-of-structural-isomers-of-gas-phase-m-n2o-n-m-cu-ag-au-ion-molecule-complexes
#18
Ethan M Cunningham, Alexander S Gentleman, Peter M Beardsmore, Andreas Iskra, Stuart R Mackenzie
Gas-phase metal ion-ligand complexes offer model environments to study molecular interactions which are key to many catalytic processes. Here, we present a combined experimental and computational study of M+(N2O)n [M= Cu, Ag, Au; n = 2-7] complexes. The spectra provide clear evidence for both nitrogen- and oxygen- bound ligands giving rise to a wide range of structural isomers for each complex studied. The evolution of the complex structures observed as well as spectral trends for each metal center are interpreted in terms of a molecular orbital binding picture and resulting calculated ligand binding energies...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28925680/a-photodetector-based-on-p-si-n-zno-nanotube-heterojunctions-with-high-ultraviolet-responsivity
#19
Tahani Hassan Flemban, Md Azimul Haque, Idris A Ajia, Norah Alwadai, Somak Mitra, Tom Wu, Iman S Roqan
Enhanced ultraviolet (UV) photodetectors (PDs) with high responsivity comparable to that of visible and infrared photodetectors are needed for commercial applications. N-type ZnO nanotubes (NTs) with high-quality optical, structural and electrical properties on a p-type Si (100) substrate are successfully fabricated by pulsed laser deposition (PLD) to produce a UV PD with high responsivity, for the first time. We measure the current-voltage characteristics of the device under dark and illuminated conditions and demonstrated the high stability and responsivity (that reaches ~ 101...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28925256/catalytic-activity-of-peptide-nanoparticle-conjugates-regulated-by-a-conformational-change
#20
Dorian Jamal Mikolajczak, Jason Lee Heier, Boris Schade, Beate Koksch
Herein, we present the design and synthesis of a catalytically active peptide-nanoparticle conjugate whose activity is regulated by a defined conformational change in the self-assembled peptide monolayer. A catalytically active peptide, designed after the heterodimeric α-helical coiled-coil principle was immobilized onto gold nanoparticles and kinetic studies were performed according to the Michaelis-Menten model. The formed peptide monolayer at the gold nanoparticle surface accelerated p nitrophenylacetate (pNPA) hydrolysis by one order of magnitude compared to the soluble peptide while exhibiting no defined secondary structure as determined by infrared (IR) and circular dichroism (CD) spectroscopy...
September 19, 2017: Biomacromolecules
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