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Maryam Hosseini-Zori
The aim of this work was synthesis and investigation of various properties of Co-doped titanium dioxide nanostructures. However, dopant has no effect on XRD pattern of the host but it can influence on the various characteristics of host such as optical and electrical properties. The results of optical properties showed that absorption energy of TiO2 decreases in presence of cobalt as dopant. Red-shift in absorption spectrum that may be due to the excitation of 3d electrons of Co ions to the conduction band of TiO2 can be considered as a strong evidence to confirm the presence of Co as dopant in TiO2 lattice...
December 8, 2017: Journal of Photochemistry and Photobiology. B, Biology
Tarbie Van Tonder, Garry T Allison, Diana Hopper, Tiffany L Grisbrook
OBJECTIVES: Evaluate the acute effect of low-Dye, placebo and no tape on motor behaviour in individuals with plantar fasciitis (PF). DESIGN: Prospective, experimental. SETTING: Motion analysis laboratory. PARTICIPANTS: Ten participants with PF and ten matched controls. MAIN OUTCOME MEASURES: Hopping behaviour (lower-limb stiffness and ankle angle at peak loading) were evaluated during low-load sleigh hopping, during three taping conditions...
November 8, 2017: Physical Therapy in Sport
Idelma A A Terra, Luiza A Mercante, Rafaela S Andre, Daniel S Correa
The accumulation of heavy metals in the human body and/or in the environment can be highly deleterious for mankind, and currently, considerable efforts have been made to develop reliable and sensitive techniques for their detection. Among the detection methods, chemical sensors appear as a promising technology, with emphasis on systems employing optically active nanofibers. Such nanofibers can be obtained by the electrospinning technique, and further functionalized with optically active chromophores such as dyes, conjugated polymers, carbon-based nanomaterials and nanoparticles, in order to produce fluorescent and colorimetric nanofibers...
December 15, 2017: Biosensors
Adarsh Vasista, Harshvardhan Jog, Tal Heilpern, Matthew E Sykes, Sunny Tiwari, Deepak Kumar Sharma, Shailendra Kumar Chaubey, Gary P Wiederrecht, Stephen K Gray, G V Pavan Kumar
We report on the experimental observation of differential wavevector distribution of surface enhanced Raman scattering (SERS) and fluorescence from dye molecules confined to a gap between plasmonic silver nanowire and a thin, gold mirror. The fluorescence was mainly confined to higher values of in-plane wavevectors, whereas SERS signal was uniformly distributed along all the wavevectors. The optical energy-momentum spectra from the distal end of the nanowire revealed strong polarisation dependence of this differentiation...
December 15, 2017: Nano Letters
Paul William Bisso, Michelle Tai, Hari Katepalli, Nicolas Bertrand, Daniel Blankschtein, Robert Langer
Hydrophobic self-assembly pairs diverse chemical precursors and simple formulation processes to access a vast array of functional colloids. Exploration of this design space, however, is stymied by lack of broadly general, high-throughput colloid characterization tools. Here, we show that a narrow structural subset of fluorescent, zwitterionic molecular rotors - dialkylaminostilbazolium sulfonates [DASS] with intermediate-length alkyl tails - fills this major analytical void by quantitatively sensing hydrophobic interfaces in microplate format...
December 15, 2017: Nano Letters
Stefan Braun, Šárka Pokorná, Radek Šachl, Martin Hof, Heiko Heerklotz, Maria Hoernke
The mode of action of membrane-active molecules such as antimicrobial, anticancer, cell penetrating, and fusion peptides and their synthetic mimics, transfection agents and drug permeation enhancers, biological signaling molecules (e.g., quorum sensing), involves either the general or local destabilization of the target membrane or the formation of defined, rather stable pores. Some effects aim at killing the cell, others need to be limited in space and time to avoid serious damage. Biological tests reveal translocation of compounds and cell death but do not provide a detailed, mechanistic, and quantitative understanding of the modes of action and their molecular basis...
December 15, 2017: ACS Nano
Álvaro Moneo Marín, João P Telo, Daniel Collado, Francisco Nájera, Ezequiel Pérez Inestrosa, Uwe Pischel
Bis(dioxaborine) dyes of the A-π-A format (A: acceptor, π: conjugated bridge) were prepared and photophysically characterized. The best performing dyes feature (a) visible-light absorption (>400 nm), (b) high molar absorption coefficients (up to 70000 M-¹cm-¹), (c) Stokes shifts in the range of ca. 3000-5000 cm-¹, and (d) strong fluorescence emission with quantum yields of up to 0.74. This yields very bright-emitting dyes for one-photon excitation. However, the most intriguing feature of the dyes is their strong two-photon absorption...
December 15, 2017: Chemistry: a European Journal
Morakot Piemjai, Spun Lenglerdphol
The purpose of this study was to evaluate the distance and/or thickness of dye penetration at enamel and cementum/dentin margins of restorations before and after vital bleaching. Class V cavities were prepared on extracted human premolars and restored with light-cured resin composite using either AQ-Bond or Single-Bond2 adhesives. Four conditions: no bleaching (control), restored before bleaching (RB), bleached and immediately restored (BIR), bleached and stored in artificial saliva for 7 days then restored (B7R), were used for each adhesive group...
December 15, 2017: Journal of Esthetic and Restorative Dentistry
Hongzhi Liu
Two different silsesquioxane-based porous polymers (FHPPs), i.e. FHPP-1 and FHPP-2 were prepared, respectively, by changing acid scavengers from sodium bicarbonate to triethylamine in the Heck reaction between octavinylsilsesquioxane (OVS) and 1, 4-dibromotetrafluorobenzene. It was observed that defluorination occurred in the case of triethylamine. FHPP-1 possessed higher surface area of 600 m2 g-1 and a hierarchical pore structure; in contrast, FHPP-2 possessed SBET of 325 m2 g-1 and a microporous structure...
December 15, 2017: Chemistry: a European Journal
Theo G Seiler, Marleen Engler, Eric Beck, Reginald Birngruber, Irene E Kochevar
Purpose: Interface bonding with corneal crosslinking (CXL) after LASIK using two different photosensitizers was studied ex vivo. Methods: A LASIK flap was created in enucleated rabbit eyes using a femtosecond laser. After the dissection, CXL was performed to seal the interface. In one group interface CXL was performed using rose bengal and green light, whereas in a second group riboflavin and UV-A light was used. In both groups irradiance, radiant exposure, dye concentration, and imbibition time was varied...
December 1, 2017: Investigative Ophthalmology & Visual Science
Kadhim Al-Attafi, Andrew Nattestad, Qijie Wu, Yusuke Ide, Yusuke Yamauchi, Shi Xue Dou, Jung Ho Kim
P25 is one of the most widely used forms of titanium(iv) oxide (TiO2), routinely utilised in dye-sensitised solar cells (DSCs), where it is often employed as a control, in spite of its poorly defined nature and the typically low device efficiency (or possibly because of this). Work by Park in 2000 and later by Lin et al. suggests that the rutile component might not be to blame for this, as has often been claimed. Recently it has been observed that P25 has quite a sizable amorphous content. A method to selectively remove this non-crystalline material has been developed, allowing for scrutiny of the role this amorphous material plays...
December 15, 2017: Chemical Communications: Chem Comm
Rhonda C Kines, Isabella Varsavsky, Sanghamitra Choudhary, Debaditya Bhattacharya, Sean Spring, Roger J McLaughlin, Shin J Kang, Hans E Grossniklaus, Demitrios G Vavvas, Stephen Monks, John R MacDougall, Elisabet de Los Pinos, John T Schiller
The work outlined herein describes AU-011, a novel recombinant papillomavirus-like particle (VLP) drug conjugate and its initial evaluation as a potential treatment for primary uveal melanoma. The VLP is conjugated with a phthalocyanine photosensitizer, IRDye 700DX, that exerts its cytotoxic effect through photo-activation with a near-infrared laser. We assessed the anti-cancer properties of AU-011 in vitro utilizing a panel of human cancer cell lines and in vivo using murine subcutaneous and rabbit orthotopic xenograft models of uveal melanoma...
December 14, 2017: Molecular Cancer Therapeutics
Shyam Panthi, Jason J Nichols
PURPOSE: To evaluate whether LipidTOX could stain lipid deposits on contact lens (CL) surfaces and compare lipid deposition patterns on various CL surfaces using an imaging method. METHODS: Ten CLs each of six silicone hydrogel materials and one hydrogel material were incubated in cholesteryl oleate solution (5.60mg/ml) for 12hours. The CLs were then separately stained with Oil Red O and LipidTOX and imaged under a fluorescence microscope. Twenty worn senofilcon A CLs from both eyes of ten participants were also stained similarly...
December 11, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
Ye Gao, Pan Wang, Yaqin Wang, Lijie Wu, Xiaobing Wang, Kun Zhang, Quanhong Liu
BACKGROUND/AIMS: Non-toxic fomitopsis is has been traditionally used in folk medicine in many countries for its anti-inflammatory and anti-vascular disease activities. The present study investigates the antitumor effect of Fomitopsis pinicola (Sw. Ex Fr.) Karst chloroform extract (FPKc) on S180 tumor cells in vitro and in vivo and we determined the underlying mechanisms. METHODS: HPLC was employed to analyze the constituents of FPKc. In-vitro 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay was performed to quantify the growth inhibition of FPKc; Propidium iodide (PI) exclusion assay and scanning electron microscopy (SEM) were used to observe the damage on the cell membrane and the changes of the cell morphology; Staining with Hoechst 33342/propidium iodide (HO/PI) and the application of the Annexin V-FITC/PI analysis permitted to observe the cell death triggered by FPKc; DNA damage and cell cycle arrest were detected by flow cytometry; Rhodamine 123 (RH123) and Cytochrome C were used as dyes to investigate the alterations of the mitochondria...
December 12, 2017: Cellular Physiology and Biochemistry
Jinu Udayabhanu, Vaitheeswari Kannan, Manish Tiwari, Geetha Natesan, Benelli Giovanni, Venkatachalam Perumal
Textile industries release tonnes of harmful toxic dyes into the environment, causing severe effects on living organisms, including humans. Mosquitoes vectors spread important diseases which cause millions of human deaths worldwide. To control mosquitoes a number of synthetic mosquitocidal agents have been employed but all these pesticides pose harmful effects to human health and non-target species and also led to resistance development in treated vectors. Microbial strains are also developing resistance to the available antibiotics, this currently represents a major public health challenge...
December 6, 2017: Journal of Photochemistry and Photobiology. B, Biology
Juan Li, Shijie Zhang, Di Shao, Zhenqing Yang, Wansong Zhang
Auxiliary acceptor groups play a crucial role in D-A-π-A structured organic dyes. In this paper, we designed three D-A-π-A structured organic molecules based on the prototype dye QT-1, named ME18-ME20, and further investigated their electronic and optical properties with density functional theory (DFT) and time-dependent DFT (TDDFT). The calculated results indicate that the scope and intensity of dyes' absorption spectra have some outstanding changes by inserting auxiliary groups. ME20 has not only 152nm redshifts to long wave orientation, but also 78% increased oscillator strength compared to QT-1, and its absorption spectrum broadens region even up to 1400nm...
December 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Joseph F Fowler, Matthew J Zirwa J Zirwas, Lisa Napolitano, Meghan Russell, Janet Coope-Epstein
<p>INTRODUCTION: Dermatologists are becoming more aware of the irritant and allergic potential of laundry detergents that incorporate harsh surfactants and potentially sensitizing ingredients. It is difficult however for the physician to distinguish one laundry detergent from another because the only distinguishing feature advertised tends to be the lack of dyes and fragrances.</p> <p>DESIGN: A new objective method was developed for measuring the harshness of laundry detergents using a three-pronged laboratory testing approach consisting of zein, corneosurfametry, and cytokine testing...
December 1, 2017: Journal of Drugs in Dermatology: JDD
Aaron K Le, Jon A Bender, Dylan H Arias, Daniel E Cotton, Justin C Johnson, Sean T Roberts
Due to its ability to offset thermalization losses in photoharvesting systems, singlet fission has become a topic of research interest. During singlet fission, a high energy spin-singlet state in an organic semiconductor divides its energy to form two lower energy spin-triplet excitations on neighboring chromophores. While key insights into mechanisms leading to singlet fission have been gained recently, developing photostable compounds that undergo quantitative singlet fission remains a key challenge. In this report, we explore triplet exciton production via singlet fission in films of perylenediimides, a class of compounds with a long history of use as industrial dyes and pigments due to their photostability...
December 14, 2017: Journal of the American Chemical Society
Kseniya Lugovik, Alexander Eltyshev, Polina Suntsova, Pavel Slepukhin, Enrico Benassi, Nataliya P Belskaya
Developing a novel, small-sized molecular building block that may be capable of emitting light in the solid state is a challenging task and has rarely been reported in the literature. BF2-containing dyes seem to be promising candidate towards this aim. Two series of new N^NBF2-complexes showing aggregation-induced emission (AIE) and aggregation-induced emission enhancement (AIEE) were designed and synthesized via a new protocol, which improves on the traditional method by employing microwave irradiation. The optical and photophysical properties of the BF2 complexes were investigated in depth...
December 14, 2017: Chemistry, An Asian Journal
Xingwei Guo, Oliver S Wenger
Excitation of a Ru(II) photosensitizer in presence of ascorbic acid leads to reduction of iminium ions to electron-rich alpha-aminoalkyl radical intermediates that are rapidly converted to reductive amination products via thiol-mediated hydrogen atom transfer (HAT). As a result, reductive amination of carbonyl compounds with amines via photoredox catalysis proceeds in good to excellent yields and with broad substrate scope, as illustrated by 16 different examples including detailed mechanistic studies. The three key novelties of this work are: (i) the rapid interception of electron-rich radical intermediates by polarity-matched HAT in a photoredox reaction, (ii) the method of reductive amination by photoredox catalysis itself, and (iii) the application of this new method for temporally and spatially controlled reactions on a solid support, as demonstrated by attachment of a fluorescent dye on an activated cellulose support via photoredox-catalyzed reductive amination...
December 14, 2017: Angewandte Chemie
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