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https://www.readbyqxmd.com/read/28095562/the-efficacy-of-q-switched-nd-yag-1064-nm-laser-in-recalcitrant-macular-amyloidosis-a-case-report
#1
Nevil Khurana, Christine Urman
Macular amyloidosis typically presents as small, dusky-brown or greyish pigmented macules, the result of altered keratin deposition. Treatment of these hyperpigmented regions with topical and systemic therapies remains challenging, however Q-Switched neodymi- um-doped yttrium aluminum garnet (ND:YAG) laser has proven to be an effective treatment modality to reduce hyperpigmentation. In this case report we investigated the ef cacy of Q-Switched Nd:YAG laser treatment on a 34-year old woman with recalcitrant macular amyloidosis who failed to respond to over-the-counter bleaching creams...
November 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28094889/selective-electrochemical-bleaching-of-the-outer-leaflet-of-fluorescently-labelled-giant-liposomes
#2
Olivier Buriez, Ana Isabel Perez Jimenez, Lylian Challier, Eric Aït-Yahiatène, Jerome Delacotte, Eric Labbe
Electrochemistry and confocal fluorescence microscopy were successfully combined to selectively bleach and monitor the fluorescence of NBD-labelled phospholipids of giant liposomes. Three types of giant unilamellar vesicles have been investigated, the fluorescent phospholipids being localized either mainly on their outer-, inner-, or both inner/outer leaflets. We established that only the fluorescent lipids incorporated in the outer leaflet of the vesicles underwent electrochemical bleaching upon reduction...
January 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28092165/recommendations-for-best-disinfectant-practices-to-reduce-the-spread-of-infection-via-wrestling-mats
#3
Linda Mull Young, Vicki Abram Motz, Emily R Markey, Suzanne C Young, Ronald E Beaschler
CONTEXT:  At the request of the National Wrestling Coaches Association and the head wrestling coach at our university, we conducted a study of infection transmission in collegiate wrestlers. OBJECTIVE:  To examine disinfectant effectiveness and develop best-practice guidelines for minimizing the spread of skin infections via wrestling mats. DESIGN:  Controlled laboratory study and crossover study. SETTING:  Laboratory and two 15-college wrestling invitational meets...
January 16, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28092141/laundry-hygiene-how-to-get-more-than-clean
#4
REVIEW
Dirk P Bockmühl
Although laundering should mainly remove stains and dirt from used and worn textiles, the elimination of microbial contamination is an important aim of the laundry process as well. While industrial and institutional laundering employs standardized processes using high temperatures (i.e. 60°C and above) and bleaching agents to ensure a sufficient hygienic reconditioning of textiles, domestic laundering processes are less defined and not always led by purposeful aims. The strive for energy efficiency of household appliances has resulted in a decrease in washing temperatures in Europe during the last decades and convenience aspects led to an increased use of liquid detergents that do not contain bleach which in turn impacts the antimicrobial efficacy of domestic laundering...
January 16, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28091877/influence-of-enamel-dentin-thickness-on-the-toxic-and-esthetic-effects-of-experimental-in-office-bleaching-protocols
#5
C C de Oliveira Duque, D G Soares, F G Basso, J Hebling, C A de Souza Costa
OBJECTIVES: This paper aims to assess the whitening effectiveness and toxicity of tooth-bleaching protocols applied to enamel/dentin disks simulating mandibular incisors (ICs) and premolars (PMs). MATERIALS AND METHODS: A 10% hydrogen peroxide (H2O2) gel was applied for 3 × 15, 1 × 15, or 1 × 5 min to enamel/dentin disks simulating mandibular ICs and PMs, and the trans-enamel and trans-dentinal diffusion products were applied to human dental pulp cells (1 h)...
January 14, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28090075/virus-host-interactions-and-their-roles-in-coral-reef-health-and-disease
#6
Rebecca Vega Thurber, Jérôme P Payet, Andrew R Thurber, Adrienne M S Correa
Coral reefs occur in nutrient-poor shallow waters, constitute biodiversity and productivity hotspots, and are threatened by anthropogenic disturbance. This Review provides an introduction to coral reef virology and emphasizes the links between viruses, coral mortality and reef ecosystem decline. We describe the distinctive benthic-associated and water-column- associated viromes that are unique to coral reefs, which have received less attention than viruses in open-ocean systems. We hypothesize that viruses of bacteria and eukaryotes dynamically interact with their hosts in the water column and with scleractinian (stony) corals to influence microbial community dynamics, coral bleaching and disease, and reef biogeochemical cycling...
January 16, 2017: Nature Reviews. Microbiology
https://www.readbyqxmd.com/read/28078551/the-proteolysis-adaptor-nbla-binds-to-the-n-terminus-of-%C3%AE-phycocyanin-implications-for-the-mechanism-of-phycobilisome-degradation
#7
Amelia Y Nguyen, William P Bricker, Hao Zhang, Daniel A Weisz, Michael L Gross, Himadri B Pakrasi
Phycobilisome (PBS) complexes are massive light-harvesting apparati in cyanobacteria that capture and funnel light energy to the photosystem. PBS complexes are dynamically degraded during nutrient deprivation, which causes severe chlorosis, and resynthesized during nutrient repletion. PBS degradation occurs rapidly after nutrient step down, and is specifically triggered by non-bleaching protein A (NblA), a small proteolysis adaptor that facilitates interactions between a Clp chaperone and phycobiliproteins...
January 11, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28074643/ultra-photostable-mesoporous-silica-coated-gap-enhanced-raman-tags-gerts-for-high-speed-bioimaging
#8
Yuqing Zhang, Yuanyuan Qiu, Li Lin, Hongchen Gu, Zeyu Xiao, Jian Ye
Surface enhanced Raman scattering (SERS) tags can be utilized as optical labeling nanoprobes similar to fluorescent dyes and quantum dots for bioimaging with additional advantages of the fingerprint vibrational signal as a unique optical code and the ultra-narrow linewidth for multiplexing. However, the development of SERS imaging technique is much less well-established compared to fluorescence imaging mainly due to the speed limitation. An effective strategy to improve the SERS imaging speed and simultaneously maintain the photostability of SERS tags has been never reported to the best of our knowledge...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28074494/an-insight-of-interface-through-excited-state-carrier-dynamics-for-promising-enhancement-of-power-conversion-efficiency-in-mn-doped-cdznsse-gradient-alloy
#9
Hirendra Nath Ghosh, Tushar Debnath, Sourav Maiti, Kausturi Parui
For realizing the significance of impurity doping in power conversion efficiency, quaternary gradient CdZnSSe alloy nanocrystals (NCs) have been synthesized along with its Mn-doped analogues via high temperature pyrolysis. Both undoped and Mn-doped CdZnSSe alloy nanocrystals have been characterized by employing HRTEM, XRD, EDX and EPR spectroscopic measurements. Here low temperature injection of chalcogen leads to gradient interface in the alloy comprising a structure of CdSe/CdS/ZnSe/ZnS nano-structure. Both steady state and ultrafast time-resolved absorption studies suggest the formation of charge transfer (CT) state due to inner quasi type-II CdSe/CdS part in the gradient CdZnSSe alloy NCs where electron get delocalized through out the conduction band (CB) of both CdSe and CdS...
January 11, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28074021/the-assimilation-of-diazotroph-derived-nitrogen-by-scleractinian-corals-depends-on-their-metabolic-status
#10
Vanessa N Bednarz, Renaud Grover, Jean-François Maguer, Maoz Fine, Christine Ferrier-Pagès
: Tropical corals are associated with a diverse community of dinitrogen (N2)-fixing prokaryotes (diazotrophs) providing the coral an additional source of bioavailable nitrogen (N) in oligotrophic waters. The overall activity of these diazotrophs changes depending on the current environmental conditions, but to what extent it affects the assimilation of diazotroph-derived N (DDN) by corals is still unknown. Here, in a series of (15)N2 tracer experiments, we directly quantified DDN assimilation by scleractinian corals from the Red Sea exposed to different environmental conditions...
January 10, 2017: MBio
https://www.readbyqxmd.com/read/28071019/influence-of-different-extraction-conditions-on-antioxidant-properties-of-soursop-peel
#11
Wei Zin Lee, Sui Kiat Chang, Hock Eng Khoo, Chiaw Mei Sia, Hip Seng Yim
BACKGROUND: Soursop is a healthy fruit. Peels form about 20% of the soursop fruit and are usually discarded as waste product. With a view to utilizing soursop peel as a source of valuable compounds, this study aimed to investigate the influence of different extraction conditions on total phenolic content (TPC) and antioxidant capacity (AC) of soursop (Annona muricata L.) peel. METHODS: Different ethanol concentrations (20-100%, v/v), extraction temperatures (25- 60°C), and extraction time (1-5 h) were tested...
October 2016: Acta Scientiarum Polonorum. Technologia Alimentaria
https://www.readbyqxmd.com/read/28070587/highly-selective-colorimetric-detection-of-cyanide-anions-in-aqueous-media-by-triphenylamine-and-phenanthro-9-10-d-imidazole-based-probes
#12
Arockiam Jesin Beneto, Ayyanar Siva
Two novel fluorescent probes based on triphenylamine (TPC) and phenanthro(9,10-d-imidazole) (PITP) have been synthesized and studied as cyanide selective indicators in aqueous media. Complete colour bleaching was observed due to the nucleophilic addition of cyanide to the 2-vinylmalononitrile of TPC, which results in the disruption of the extended conjugation and turns off the intramolecular charge transfer (ICT) process. Furthermore, a visible color change was observed with a large Stokes shift (108 nm) upon the addition of cyanide anions to PITP, due to the formation of hydrogen bonding between the CN(-) anion and -NH of PITP, which increased the electron density on the donor moiety and induced strong ICT...
January 10, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28069502/synthesis-and-characterization-of-citrate-based-fluorescent-small-molecules-and-biodegradable-polymers
#13
Zhiwei Xie, Jimin P Kim, Qing Cai, Yi Zhang, Jinshan Guo, Ranjodh S Dhami, LiLi, Bin Kong, Yixue Su, Kevin A Schug, Jian Yang
Novel citric acid based photoluminescent dyes and degradable polymers are synthesized via a facile "one-pot" reaction. A comprehensive understanding of the fluorescence mechanisms of the resulting citric acid-based fluorophores is reported. Two distinct types of fluorophores are identified: a thiozolopyridine family with high quantum yield, long lifetime, and exceptional photostability, and a dioxopyridine family with relatively lower quantum yield, multiple lifetimes, and solvent-dependent band shifting behavior...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28067529/in-situ-evidence-of-the-redox-state-dependence-of-photoluminescence-in-graphene-quantum-dots
#14
Joaquin Barrera, David Ibañez, Aranzazu Heras, Virginia Ruiz, Alvaro Colina
Changes in the optical properties of graphene quantum dots (GQD) during electrochemical reduction and oxidation were investigated by photoluminescence (PL) spectroelectrochemistry, which provided direct in situ evidence of the dependence of GQD luminescence on their redox state. We demonstrated that GQD PL intensity was enhanced upon reduction (quantum yield increased from 0.44 to 0.55) and substantially bleached during oxidation (quantum yield ∼0.12). Moreover, PL emission blue/red-shifted upon GQD reduction/oxidation, rendering information about electronic transitions involved in the redox processes, namely, the π → π* and the n → π* transitions between energy levels of the aromatic sp(2) domains and the functional groups, respectively...
January 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28062602/methods-used-to-study-the-oligomeric-structure-of-g-protein-coupled-receptors
#15
Hui Guo, Su An, Richard J Ward, Yang Yang, Ying Liu, Xiao-Xi Guo, Qian Hao, Tian-Rui Xu
G-protein coupled receptors (GPCRs), which constitute the largest family of cell surface receptors, were originally thought to function as monomers, but are now recognized as being able to act in a wide range of oligomeric states and indeed, it is known that the oligomerization state of a GPCR can modulate its pharmacology and function. A number of experimental techniques have been devised to study GPCR oligomerization including those based upon traditional biochemistry such as blue-native polyacrylamide gel-electrophoresis (BN-PAGE), co-immunoprecipitation and protein-fragment complementation assays, those based upon resonance energy transfer, fluorescence resonance energy transfer (FRET), time-resolved FRET, FRET spectrometry and bioluminescence resonance energy transfer (BRET)...
January 6, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28061030/regeneration-of-%C3%AE-carotene-from-radical-cation-by-eugenol-isoeugenol-and-clove-oil-in-the-marcus-theory-inverted-region-for-electron-transfer
#16
Hui-Ting Chang, Hong Cheng, Rui-Min Han, Peng Wang, Jian-Ping Zhang, Leif H Skibsted
Rate of regeneration of β-carotene by eugenol from the β-carotene radical cation, an initial bleaching product of β-carotene, was found by laser flash photolysis and transient absorption spectroscopy to be close to the diffusion limit in chloroform/methanol (9:1, v:v) with a second-order rate constant (k2) of 4.3×109 Lmol-1s-1. at 23 °C. Isoeugenol, more reducing with a standard reduction potential 100 mV lower than eugenol, was slower with k2 = 7.2 ×108 Lmol-1s-1. Regeneration of β-carotene following photobleaching was found 50% more efficient by eugenol, indicating that for the more reducing isoeugenol, the driving force exceeds the reorganization energy for electron transfer significantly in the Marcus theory inverted region...
January 6, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28059520/the-role-of-electronic-and-phononic-excitation-in-the-optical-response-of-monolayer-ws2-after-ultrafast-excitation
#17
Claudia Ruppert, Alexey Chernikov, Heather M Hill, Albert F Rigosi, Tony F Heinz
Transient changes of the optical response of WS2 monolayers are studied by femtosecond broadband pump-probe spectroscopy. Time-dependent absorption spectra are analyzed by tracking the line width broadening, bleaching, and energy shift of the main exciton resonance as a function of time delay after the excitation. Two main sources for the pump-induced changes of the optical response are identified. Specifically, we find an interplay between modifications induced by many-body interactions from photoexcited carriers and by the subsequent transfer of the excitation to the phonon system followed by cooling of the material through the heat transfer to the substrate...
January 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28052216/pattern-of-hydroxyapatite-crystal-growth-on-bleached-enamel-following-the-application-of-two-antioxidants-an-atomic-force-microscope-study
#18
Chitra P Bhusari, Divya S Sharma
OBJECTIVES: This study observed the topographical pattern of hydroxyapatite deposition and growth (D&G) on bleached enamel following application of two antioxidants (sodium ascorbate and catalase) using atomic force microscope. STUDY DESIGN: Twenty enamel specimens (4×3×2mm), prepared from extracted impacted third molars, were mounted in self-cure acrylic and randomly grouped as: Group I-untreated; Group II- 35%H2O2; Group III- 35%H2O2 + artificial saliva; Group IV- 35%H2O2 + catalase+ artificial saliva; Group V- 35%H2O2 + sodium ascorbate+ artificial saliva...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28050974/modifying-optical-properties-of-reduced-graphene-oxide-with-controlled-ozone-and-thermal-treatment-in-aqueous-suspensions
#19
Md Tanvir Hasan, Brian J Senger, Price Mulford, Conor Ryan, Hung Doan, Zygmunt Gryczynski, Anton V Naumov
Graphene possesses a number of advantageous properties, however, does not exhibit optical emission, which limits its use in optoelectronics. Unlike graphene, its functional derivative, graphene oxide (GO) exhibits fluorescence emission throughout the visible. Here, we focus on controlled methods for tuning the optical properties of GO. We introduce ozone treatment of reduced graphene oxide (RGO) in order to controllably transform it from non-emissive graphene-like material into GO with a specific fluorescence emission response...
January 4, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28048637/su-f-t-324-experimental-measurement-of-optically-stimulated-luminescence-detectors-in-a-mr-igrt-environment-toward-assessing-magnetic-field-effects-on-these-devices-and-their-use-as-an-in-vivo-dosimeter
#20
M Reilly, A Curcuru, S Yaddanapudi, O Green
PURPOSE: To characterize magnetic field effects on Optically Stimulated Luminescence Detectors (OSLDs) for use as an in-vivo dosimeter in an MRIGRT machine. METHODS: Landauer OSLD nano-dots and the MicroStar II reader were used to measure and record OSLDs exposed in and on a solid water phantom in a 10.5 × 10.5 cm(2) field, Co-60, 0.32-Tesla MR-IGRT machine - with and without the presence of the magnetic field. Two orthogonal gantry angles were considered to assess orientation effects on the OSLDs with respect to the incident angle of the radiation beam and magnetic field...
June 2016: Medical Physics
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