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Light activated bleaching

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https://www.readbyqxmd.com/read/29770811/intrinsic-peroxidase-like-activity-and-enhanced-photo-fenton-reactivity-of-iron-substituted-polyoxometallate-nanostructures
#1
Akif Zeb, Shafaq Sahar, Umair Yaqub Qazi, Atheer Hameid Odda, Naseeb Ullah, Ya-Nan Liu, Ishtiaq A Qazi, An-Wu Xu
Heteropolyacids (HPAs) are a class of polyoxometallates (POMs) with oxygen-rich surfaces. Herein, we have developed an Fe-containing heteropolyacid by cation-exchange and employed KFePW12O40 nanostructures for Fenton, photo-Fenton and enzyme-mimetic reactions. The as-prepared KFePW12O40 catalyst exhibits efficient degradation of Rhodamine B (RhB) via the photo-Fenton reaction. As an enzyme-mimetic, this material can effectively oxidize TMB and dopamine. The obtained nanomaterials were characterized via SEM, TEM, XPS, BET surface area, TGA, UV-Vis spectroscopy, FT-IR, and XRD techniques...
May 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29752956/advanced-microscopy-to-elucidate-cardiovascular-injury-and-regeneration-4d-light-sheet-imaging
#2
REVIEW
Kyung In Baek, Yichen Ding, Chih-Chiang Chang, Megan Chang, René R Sevag Packard, Jeffrey J Hsu, Peng Fei, Tzung K Hsiai
The advent of 4-dimensional (4D) light-sheet fluorescence microscopy (LSFM) has provided an entry point for rapid image acquisition to uncover real-time cardiovascular structure and function with high axial resolution and minimal photo-bleaching/-toxicity. We hereby review the fundamental principles of our LSFM system to investigate cardiovascular morphogenesis and regeneration after injury. LSFM enables us to reveal the micro-circulation of blood cells in the zebrafish embryo and assess cardiac ventricular remodeling in response to chemotherapy-induced injury using an automated segmentation approach...
May 9, 2018: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/29751426/biofilm-biodiversity-in-french-and-swiss-show-caves-using-the-metabarcoding-approach-first-data
#3
Stéphane Pfendler, Battle Karimi, Pierre-Alain Maron, Lisa Ciadamidaro, Benoît Valot, Faisl Bousta, Laurence Alaoui-Sosse, Badr Alaoui-Sosse, Lotfi Aleya
In recent decades, show caves have begun to suffer from microorganism proliferation due to artificial lighting installations for touristic activity. In addition to the aesthetic problem, light encourages microorganisms that are responsible for physical and chemical degradation of limestone walls, speleothems and prehistoric paintings of cultural value. Microorganisms have previously been described by microscopy or culture-dependent methods, but data provided by new generation sequencing are rare. The authors identified, for the first time, microorganisms proliferating in one Swiss and in four French show caves using three different primers...
February 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29730301/phosphorylation-induced-conformational-changes-of-photoactivated-rhodopsin-probed-by-fluorescent-labeling-at-cys-140-and-cys-316
#4
Sheerly Rodríguez, May-Li Silva, Gustavo Benaím, José Bubis
In order to monitor conformational changes following photoactivation and phosphorylation of bovine rhodopsin, the two reactive sulfhydryl groups at Cys140 and Cys316 were specifically labeled with the monobromobimane (mBBr) fluorophore. Although alterations in conformation after light exposure of rhodopsin were not detected by fluorescence excitation scans (300-450 nm) of the mBBr-labeled protein, the fluorescence signal was reduced ∼ 90% in samples containing photoactivated phosphorhodopsin. Predominant labeling at either Cys140 or Cys316 in light-activated and phosphorylated rhodopsin merely generated a decrease of ∼ 38% and 28%, respectively, in the fluorescence excitation intensity...
May 3, 2018: Biochimie
https://www.readbyqxmd.com/read/29700464/in-office-dental-bleaching-with-light-vs-without-light-a-systematic-review-and-meta-analysis
#5
(no author information available yet)
Activation of in-office bleaching gel with light does not improve colour change nor affect tooth sensitivity.  et al.  2018; 70: 1-13.
April 27, 2018: British Dental Journal
https://www.readbyqxmd.com/read/29684583/a-novel-rpe65-inhibitor-cu239-suppresses-visual-cycle-and-prevents-retinal-degeneration
#6
Younghwa Shin, Gennadiy Moiseyev, Konstantin Petrukhin, Christopher L Cioffi, Parthasarathy Muthuraman, Yusuke Takahashi, Jian-Xing Ma
The retinoid visual cycle is an ocular retinoid metabolism specifically dedicated to support vertebrate vision. The visual cycle serves not only to generate light-sensitive visual chromophore 11-cis-retinal, but also to clear toxic byproducts of normal visual cycle (i.e. all-trans-retinal and its condensation products) from the retina, ensuring both the visual function and the retinal health. Unfortunately, various conditions including genetic predisposition, environment and aging may attribute to a functional decline of the all-trans-retinal clearance...
April 20, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29594826/sodium-hypochlorite-penetration-into-dentinal-tubules-after-manual-dynamic-agitation-and-ultrasonic-activation-a-histochemical-evaluation
#7
Luigi Generali, Erica Campolongo, Ugo Consolo, Carlo Bertoldi, Luciano Giardino, Francesco Cavani
The aim of this study was to compare the effects of Manual Dynamic Agitation and Passive Ultrasonic Irrigation on sodium hypochlorite (NaOCl) penetration into dentinal tubules using its bleaching ability. Thirty-four single-rooted teeth with round-shaped root canals were distributed in two homogeneous groups and one control group, characterized by different NaOCl activation systems: Manual Dynamic Agitation and Passive Ultrasonic Irrigation. After instrumentation, all root canals were stained with 10% copper sulphate solution followed by 1% rubeanic acid alcohol solution under vacuum...
March 28, 2018: Odontology
https://www.readbyqxmd.com/read/29517089/revealing-dynamically-organized-receptor-ion-channel-clusters-in-live-cells-by-a-correlated-electric-recording-and-super-resolution-single-molecule-imaging-approach
#8
Rajeev Yadav, H Peter Lu
The N-methyl-d-aspartate (NMDA) receptor ion-channel is activated by the binding of ligands, along with the application of action potential, important for synaptic transmission and memory functions. Despite substantial knowledge of the structure and function, the gating mechanism of the NMDA receptor ion channel for electric on-off signals is still a topic of debate. We investigate the NMDA receptor partition distribution and the associated channel's open-close electric signal trajectories using a combined approach of correlating single-molecule fluorescence photo-bleaching, single-molecule super-resolution imaging, and single-channel electric patch-clamp recording...
March 28, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29500274/retinoid-isomerase-inhibitors-impair-but-do-not-block-mammalian-cone-photoreceptor-function
#9
Philip D Kiser, Jianye Zhang, Aditya Sharma, Juan M Angueyra, Alexander V Kolesnikov, Mohsen Badiee, Gregory P Tochtrop, Junzo Kinoshita, Neal S Peachey, Wei Li, Vladimir J Kefalov, Krzysztof Palczewski
Visual function in vertebrates critically depends on the continuous regeneration of visual pigments in rod and cone photoreceptors. RPE65 is a well-established retinoid isomerase in the pigment epithelium that regenerates rhodopsin during the rod visual cycle; however, its contribution to the regeneration of cone pigments remains obscure. In this study, we use potent and selective RPE65 inhibitors in rod- and cone-dominant animal models to discern the role of this enzyme in cone-mediated vision. We confirm that retinylamine and emixustat-family compounds selectively inhibit RPE65 over DES1, the putative retinoid isomerase of the intraretinal visual cycle...
April 2, 2018: Journal of General Physiology
https://www.readbyqxmd.com/read/29448088/antioxidant-activity-and-total-phenolic-content-of-ethanolic-extract-of-pomegranate-peels-juice-and-seeds
#10
Zahra Derakhshan, Margherita Ferrante, Marzieh Tadi, Farnoosh Ansari, Ali Heydari, Motahreh Sadat Hosseini, Gea Oliveri Conti, Elham Khalili Sadrabad
Pomegranate (Punica granatum L.) is extensively cultivated in Middle East especially in Iran. For centuries, this fruit has been used in Iranian herbal medicine. Pomegranate peel, seed and juice contain considerable amounts of phenolic compounds and have antioxidant activity. Pomegranate peels, juice and seeds from three regions of Natanz, Shahreza, and Doorak were obtained. Antioxidant activity, total phenolic, flavonoids, and flavonols contents of pomegranate peels, seeds and juices extracts were analyzed...
April 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29442439/wet-imprinting-of-channel-type-superstructures-in-nanostructured-titania-thin-films-at-low-temperatures-for-hybrid-solar-cells
#11
Lin Song, Tianyi Wang, Volker Körstgens, Weijia Wang, Nitin Saxena, Christoph J Schaffer, Thomas Fröschl, Nicola Hüsing, Sigrid Bernstorff, Peter Müller-Buschbaum
Hierarchically structured titania films, exhibiting interconnected foam-like nanostructures and large-scale channel-type superstructures, were achieved in an energy-saving way at low temperatures by a polymer template-assisted sol-gel synthesis in combination with a wet-imprinting process. The surface morphology was probed with scanning electron microscopy and atomic force microscopy, whereas the inner morphology was characterized with grazing incidence small-angle X-ray scattering measurements. Compared to the initial hybrid films, the titania films showed reduced structure sizes caused by removal of the polymer template...
April 9, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29422126/highly-selective-and-sensitive-fluorescence-sensing-of-nanomolar-zn-2-ions-in-aqueous-medium-using-calix-4-arene-passivated-carbon-quantum-dots-based-on-fluorescence-enhancement-real-time-monitoring-and-intracellular-investigation
#12
Harpreet Kaur, Pushap Raj, Hemant Sharma, Meenakshi Verma, Narinder Singh, Navneet Kaur
Carbon Quantum Dots (CDs) owing to its unique photophysical properties have attracted immense consideration of the researchers in last decade to explore its applications in the fields of bio-imaging and sensing. In the present work, we have developed a novel CDs functionalized with Calix[4]arene derivative by hydrothermal route to detect biologically pertinent Zn2+ ions. Surface modification of CDs enhances fluorescence efficiency apart from introducing active surface sites broadening its sensor capabilities...
June 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29407814/polymer-dots-grafted-tio-2-nanohybrids-as-high-performance-visible-light-photocatalysts
#13
Gen Li, Feng Wang, Peng Liu, Zheming Chen, Ping Lei, Zhongshan Xu, Zengxi Li, Yanfen Ding, Shimin Zhang, Mingshu Yang
As a new member of carbon dots (CDs), Polymer dots (PDs) prepared by hydrothermal treatment of polymers, usually consist of the carbon core and the connected partially degraded polymer chains. This type of CDs might possess aqueous solubility, non-toxicity, excellent stability against photo-bleaching and high visible light activity. In this research, PDs were prepared by a moderate hydrothermal treatment of polyvinyl alcohol, and PDs grafted TiO2 (PDs-TiO2 ) nanohybrids with TiOC bonds were prepared by a facile in-situ hydrothermal treatment of PDs and Ti (SO4 )2 ...
April 2018: Chemosphere
https://www.readbyqxmd.com/read/29399308/comparison-of-tooth-color-change-after-bleaching-with-conventional-and-different-light-activated-methods
#14
Sima Shahabi, Hadi Assadian, Alireza Mahmoudi Nahavandi, Hanieh Nokhbatolfoghahaei
Introduction: The demand for esthetic dental treatments is increasing in recent years mainly due to improved oral hygiene and better maintenance of oral health and teeth in older individuals. Bleaching of discolored anterior teeth is the most popular among esthetic dental treatments. Even individuals with sound teeth and adequate esthetics seek to have whiter teeth in the anterior region. The aim of this study was to evaluate tooth color changes following conventional in-office bleaching techniques compared to light-activated methods using different light sources...
2018: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/29289725/in-office-dental-bleaching-with-light-vs-without-light-a-systematic-review-and-meta-analysis
#15
REVIEW
Bianca Medeiros Maran, Adrieli Burey, Thalita de Paris Matos, Alessandro D Loguercio, Alessandra Reis
OBJECTIVE: A systematic review and meta-analysis were performed to answer the following research question: Does light-activated in-office vital bleaching have a greater whitening efficacy and higher tooth sensitivity (TS) in comparison with in-office vital bleaching without light when used in adults? DATA AND SOURCE: Only randomized clinical trials (RCTs) involving adults who had in-office bleaching with and without light activation were included. Controlled vocabulary and keywords were used in a comprehensive search for titles and abstracts in PubMed, and this search was adapted for Scopus, Web of Science, LILACS, BBO, Cochrane Library, and SIGLE without restrictions in May 2016 and was updated in August 2017...
March 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29284097/effectiveness-of-led-laser-irradiation-on-in-office-dental-bleaching-after-three-years
#16
Rfl Mondelli, Fap Rizzante, E R Rosa, Afs Borges, A Y Furuse, Jfs Bombonatti
The present in vivo randomized, triple-blinded, and split-mouth clinical study evaluated the effectiveness of a hybrid light (HL) source on the color change, stability, and tooth sensitivity in patients submitted to different in-office bleaching techniques. Twenty volunteers were divided into two groups and four subgroups. A split-mouth design was conducted to compare two in-office bleaching techniques (with and without light activation): 35% Lase Peroxide Sensy (LPS) + HL: 35% hydrogen peroxide (HP) + HL; 35% LPS: 35% HP; 25% LPS + HL: 25% HP + HL; and 35% Whiteness HP (WHP): 35% HP...
January 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29245768/non-bleaching-fluorescence-emission-difference-microscopy-using-single-808-nm-laser-excited-red-upconversion-emission
#17
Qiusheng Wu, Bingru Huang, Xingyun Peng, Sailing He, Qiuqiang Zhan
Optical super-resolution microscopy has become a powerful technique to help scientists to monitor the sample of interest at nanoscale. Fluorescence emission difference (FED) microscopy, a very facile super-resolution method, does not require high depleting laser intensity and is independent on the species of agents, which makes FED microscopy possess great potential. However, to date, the biomarkers applied in FED microscopy usually suffer from a photo-bleaching problem. In this work, by introducing Er3+ activated upconverting nanoparticles with red-color emission and non-photobleaching properties, we demonstrate nonbleaching super-resolution imaging with FED microscopy...
December 11, 2017: Optics Express
https://www.readbyqxmd.com/read/29215690/impact-of-material-shade-and-distance-from-light-curing-unit-tip-on-the-depth-of-polymerization-of-composites
#18
André L Faria-E-Silva, Christopher Fanger, Lillian Nguyen, Demetri Howerton, Carmem S Pfeifer
This study aimed to evaluate the effect of the composite shade and distance from the light-curing unit (LCU) tip on the irradiance reaching the bottom of composite disks and on the depth of polymerization. Composites of three shades (opaque - OXDC, bleach - BXL, and A2) were inserted into molds with 3-mm of thickness positioned over a spectrometer and photo-activated with the LCU (Bluephase) tip placed at 0 or 1 cm from the composite surface. The mean irradiance reaching the bottom of composite was recorded during the entire photo-activation (30 s)...
September 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29180667/rods-progressively-escape-saturation-to-drive-visual-responses-in-daylight-conditions
#19
Alexandra Tikidji-Hamburyan, Katja Reinhard, Riccardo Storchi, Johannes Dietter, Hartwig Seitter, Katherine E Davis, Saad Idrees, Marion Mutter, Lauren Walmsley, Robert A Bedford, Marius Ueffing, Petri Ala-Laurila, Timothy M Brown, Robert J Lucas, Thomas A Münch
Rod and cone photoreceptors support vision across large light intensity ranges. Rods, active under dim illumination, are thought to saturate at higher (photopic) irradiances. The extent of rod saturation is not well defined; some studies report rod activity well into the photopic range. Using electrophysiological recordings from retina and dorsal lateral geniculate nucleus of cone-deficient and visually intact mice, we describe stimulus and physiological factors that influence photopic rod-driven responses...
November 27, 2017: Nature Communications
https://www.readbyqxmd.com/read/29159178/zinc-containing-hydroxyapatite-enhances-cold-light-activated-tooth-bleaching-treatment-in-vitro
#20
Yi Li, Xinchang Shi, Wei Li
Cold-light bleaching treatment has grown to be a popular tooth whitening procedure in recent years, but its side effect of dental enamel demineralization is a widespread problem. The aim of this study was to synthesize zinc-substituted hydroxyapatite as an effective biomaterial to inhibit demineralization or increase remineralization. We synthesized zinc-substituted hydroxyapatite containing different zinc concentrations and analysed the product using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and energy dispersive spectrometer (EDS)...
2017: BioMed Research International
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