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https://www.readbyqxmd.com/read/27926747/peroxide-dental-bleaching-via-laser-microchannels-and-tooth-color-measurements
#1
Gregory Altshuler, Andrey Belikov, Alexei Skrypnik, Felix Feldchtein, Alexandra Pushkareva, Ksenia Shatilova, Igor Cernavin, Valery Tuchin
No abstract text is available yet for this article.
December 1, 2016: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/27924868/species-specific-control-of-external-superoxide-levels-by-the-coral-holobiont-during-a-natural-bleaching-event
#2
Julia M Diaz, Colleen M Hansel, Amy Apprill, Caterina Brighi, Tong Zhang, Laura Weber, Sean McNally, Liping Xun
The reactive oxygen species superoxide (O2(·-)) is both beneficial and detrimental to life. Within corals, superoxide may contribute to pathogen resistance but also bleaching, the loss of essential algal symbionts. Yet, the role of superoxide in coral health and physiology is not completely understood owing to a lack of direct in situ observations. By conducting field measurements of superoxide produced by corals during a bleaching event, we show substantial species-specific variation in external superoxide levels, which reflect the balance of production and degradation processes...
December 7, 2016: Nature Communications
https://www.readbyqxmd.com/read/27922080/warming-trends-and-bleaching-stress-of-the-world-s-coral-reefs-1985-2012
#3
Scott F Heron, Jeffrey A Maynard, Ruben van Hooidonk, C Mark Eakin
Coral reefs across the world's oceans are in the midst of the longest bleaching event on record (from 2014 to at least 2016). As many of the world's reefs are remote, there is limited information on how past thermal conditions have influenced reef composition and current stress responses. Using satellite temperature data for 1985-2012, the analysis we present is the first to quantify, for global reef locations, spatial variations in warming trends, thermal stress events and temperature variability at reef-scale (~4 km)...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27920339/identification-of-chlorophyll-dephytylase-involved-in-chlorophyll-turnover-in-arabidopsis
#4
Yao-Pin Lin, Meng-Chen Wu, Yee-Yung Charng
Chlorophyll turns over in green organs during photosystem repair and is salvaged via de- and re-phytylation, but the enzyme involved in de-phytylation is unknown. We have identified an Arabidopsis thaliana thylakoid protein with a putative hydrolase domain that can dephytylate chlorophyll in vitro and in vivo. The corresponding locus, CHLOROPHYLL DEPHYTYLASE1 (CLD1), was identified by mapping a semi-dominant, heat-sensitive, missense allele (cld1-1). CLD1 is conserved in oxygenic photosynthetic organisms, sharing structural similarity with pheophytinase, which functions in chlorophyll breakdown during leaf senescence...
December 5, 2016: Plant Cell
https://www.readbyqxmd.com/read/27918005/a-review-of-melasma-treatment-focusing-on-laser-and-light-devices
#5
Janet Y Li, Elizabeth Rc Geddes, Deanne M Robinson, Paul M Friedman
Melasma is a pigmentary disorder of unclear etiology with numerous treatment options and high recurrence rates. Laser and light therapies may be utilized cautiously as second- or third-line options for recalcitrant melasma, but low-energy settings are preferred due to the risk of postinflammatory hyperpigmentation and melasma stimulation. Commonly used lasers include the low-fluence 1064-nm Q-switched neodymium-doped yttrium aluminum garnet laser, nonablative fractionated lasers, and intense pulsed light. Strict sun protection, concomitant use of bleaching agents, and maintenance treatments are necessary...
December 2016: Seminars in Cutaneous Medicine and Surgery
https://www.readbyqxmd.com/read/27917912/xylanase-treatment-suppresses-light-and-heat-induced-yellowing-of-pulp
#6
Daolei Zhang, Xuezhi Li, Meimei Wang, Yanxin Ye, Jian Du, Xianqin Lu, Jian Zhao
Xylanase is commonly applied in pulp and paper industries to ease cost-related and environmental pressures. The effect of xylanase treatment on pulp bleaching is well-established, however, few studies were conducted on the effects of xylanase treatment in pulp yellowing, especially the mechanism of pulp yellowing inhibition by xylanase treatment. In this study, pure xylanase (EC 3.2.1.8) was applied to treat wheat straw chemical pulp (CP) and poplar chemi-thermo-mechanical pulp (CTMP) to determine their effects on pulp brightness and on light- and heat-induced yellowing...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27917888/heterotrophy-promotes-the-re-establishment-of-photosynthate-translocation-in-a-symbiotic-coral-after-heat-stress
#7
Pascale Tremblay, Andrea Gori, Jean François Maguer, Mia Hoogenboom, Christine Ferrier-Pagès
Symbiotic scleractinian corals are particularly affected by climate change stress and respond by bleaching (losing their symbiotic dinoflagellate partners). Recently, the energetic status of corals is emerging as a particularly important factor that determines the corals' vulnerability to heat stress. However, detailed studies of coral energetic that trace the flow of carbon from symbionts to host are still sparse. The present study thus investigates the impact of heat stress on the nutritional interactions between dinoflagellates and coral Stylophora pistillata maintained under auto- and heterotrophy...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27913962/bathing-and-associated-treatments-in-atopic-dermatitis
#8
REVIEW
Julia K Gittler, Jason F Wang, Seth J Orlow
Atopic dermatitis is one of the most common complaints presenting to dermatologists, and patients typically inquire as to appropriate bathing recommendations. Although many dermatologists, allergists, and primary-care practitioners provide explicit bathing instructions, recommendations regarding frequency of bathing, duration of bathing, and timing related to emollient and medication application relative to bathing vary widely. Conflicting and vague guidelines stem from knowledge related to the disparate effects of water on skin, as well as a dearth of studies, especially randomized controlled trials, evaluating the effects of water and bathing on the skin of patients with atopic dermatitis...
December 3, 2016: American Journal of Clinical Dermatology
https://www.readbyqxmd.com/read/27913206/mag-fluo4-in-t-cells-imaging-of-intra-organelle-free-ca-2-concentrations
#9
Björn-Philipp Diercks, Ralf Fliegert, Andreas H Guse
Ca(2+) signaling is a major signal transduction pathway involved in T cell activation, but also in apoptosis of T cells. Since T cells make use of several Ca(2+)-mobilizing second messengers, such as nicotinic acid adenine dinucleotide phosphate, d-myo-inositol 1,4,5-trisphosphate, and cyclic ADP-ribose, we intended to analyze luminal Ca(2+) concentration upon cell activation. Mag-Fluo4/AM, a low-affinity Ca(2+) dye known to localize to the endoplasmic reticular lumen in many cell types, showed superior brightness and bleaching stability, but, surprisingly, co-localized with mito-tracker, but not with ER-tracker in Jurkat T cells...
November 29, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27910631/a-simple-approach-to-spectrally-resolved-fluorescence-and-bright-field-microscopy-over-select-regions-of-interest
#10
Peter D Dahlberg, Christopher T Boughter, Nabil F Faruk, Lu Hong, Young Hoon Koh, Matthew A Reyer, Alon Shaiber, Aiman Sherani, Jiacheng Zhang, Justin E Jureller, Adam T Hammond
A standard wide field inverted microscope was converted to a spatially selective spectrally resolved microscope through the addition of a polarizing beam splitter, a pair of polarizers, an amplitude-mode liquid crystal-spatial light modulator, and a USB spectrometer. The instrument is capable of simultaneously imaging and acquiring spectra over user defined regions of interest. The microscope can also be operated in a bright-field mode to acquire absorption spectra of micron scale objects. The utility of the instrument is demonstrated on three different samples...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27908717/biological-properties-of-water-soluble-polysaccharides-and-hemicelluloses-from-almond-gum
#11
Fatma Bouaziz, Mohamed Koubaa, Rhoudha Ellouz Ghorbel, Semia Ellouz Chaabouni
The aim of this work was to investigate the biological activities of almond gum polysaccharides (AGP) and almond gum hemicelluloses (AGH). Almond gum was first fractionated into AGP and AGH using hot water and alkaline solution, respectively. The antioxidant activities of both extracted polymers revealed interesting free radical scavenging activities through DPPH test (IC50 AGP=4mg/mL, IC50 AGH=6mg/mL), 2,2'-azinobis[3-ethylbenzthiazoline]-6-sulfonic acid (ABTS) radical scavenging activity test (% inhibition ABTS=40...
November 28, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27907894/interventions-for-orthodontically-induced-white-spot-lesions-a-systematic-review-and-meta-analysis
#12
REVIEW
Damian Höchli, Monika Hersberger-Zurfluh, Spyridon N Papageorgiou, Theodore Eliades
BACKGROUND: Although orthodontic white spot lesions (WSLs) are one of the most often and most evident adverse effects of comprehensive fixed appliance treatment, the efficacy of interventions for WSLs has not yet been adequately assessed in an evidence-based manner. OBJECTIVE: Aim of this systematic review was to assess the therapeutic and adverse effects of interventions to treat post-orthodontic WSLs from randomized trials in human patients. SEARCH METHODS: An unrestricted electronic search of eight databases from inception to May 2016...
October 17, 2016: European Journal of Orthodontics
https://www.readbyqxmd.com/read/27906168/immunofluorescent-antibody-staining-of-intact-drosophila-larvae
#13
Laurina Manning, Chris Q Doe
Antibody staining is a vital technique for studying the development of many model organisms, including Drosophila. Reliable protocols have long been available for antibody staining of Drosophila whole-mount embryos and dissected larvae. By contrast, methods for staining whole larvae have rarely been reported, are unreliable, and fail to work on large third-instar larvae. This has become a major limitation to understanding the role of multitissue interactions such as neural circuit formation and cell metastasis...
January 2017: Nature Protocols
https://www.readbyqxmd.com/read/27902926/dental-bleaching-with-the-use-of-violet-light-only-reality-or-future
#14
Andréa Dias Neves Lago, Winnie Dandara Rocha Ferreira, Guilherme Silva Furtado
No abstract text is available yet for this article.
November 27, 2016: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/27901225/external-cervical-resorption-diagnostic-and-treatment-tips
#15
Alberto Consolaro
External cervical resorption is caused, almost exclusively, by dental trauma - especially those characterized by concussion - and is a dental disease to be diagnosed and treated accurately by endodontists. However, the vast majority of the cases is initially diagnosed by an orthodontist, due to the imaging possibilities in standardized documentations. Among the causes of external cervical resorption, it is common to mistakenly attribute it to orthodontic treatment, traumatic occlusion or even to chronic inflammatory periodontal disease...
September 2016: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/27897283/identification-of-photofragmentation-patterns-in-trihalide-anions-by-global-analysis-of-vibrational-wavepacket-dynamics-in-broadband-transient-absorption-data
#16
Sebastian Schott, Lea Ress, Jan Hrušák, Patrick Nuernberger, Tobias Brixner
Trihalide anions are linear molecules that can be photodissociated with ultraviolet (UV) light. Whereas deep-UV excitation leads to three-body dissociation, for near-UV excitation just one molecular bond is cleaved, which notionally opens up the possibility for different fragmentation patterns. Here, we explore whether the dihalide fragment is formed as an anionic or neutral species and whether heteronuclear trihalides can lead to two different dihalides. The analysis is based on pronounced wavepacket dynamics induced by femtosecond UV pulses and associated both with the initial trihalide and the nascent dihalide species...
November 29, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27897254/high-level-expression-of-improved-thermo-stable-alkaline-xylanase-variant-in-pichia-pastoris-through-codon-optimization-multiple-gene-insertion-and-high-density-fermentation
#17
Yihong Lu, Cheng Fang, Qinhong Wang, Yuling Zhou, Guimin Zhang, Yanhe Ma
In paper industry, xylanases are used to increase the pulp properties in bleaching process as its eco-friendly nature. The xylanases activity is hindered by high temperature and alkaline conditions with high enzyme production cost in the paper industry. Here, XynHB, an alkaline stable xylanase from Bacillus pumilus HBP8 was mutated at N188A to XynHBN188A. Expressed mutant in E. coli showed 1.5-fold higher xylanase activity than XynHB at 60 °C. The mutant expressed in Pichia pastoris was glycosylated, remained stable for 30 min at 60 °C...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27896036/detecting-sedimentation-impacts-to-coral-reefs-resulting-from-dredging-the-port-of-miami-florida-usa
#18
Margaret W Miller, Jocelyn Karazsia, Carolyn E Groves, Sean Griffin, Tom Moore, Pace Wilber, Kurtis Gregg
The federal channel at Port of Miami, Florida, USA, was dredged between late 2013 and early 2015 to widen and deepen the channel. Due to the limited spatial extent of impact-assessment monitoring associated with the project, the extent of the dredging impacts on surrounding coral reefs has not been well quantified. Previously published remote sensing analyses, as well as agency and anecdotal reports suggest the most severe and largest area of sedimentation occurred on a coral reef feature referred to as the Inner Reef, particularly in the sector north of the channel...
2016: PeerJ
https://www.readbyqxmd.com/read/27892835/effect-of-adhesive-restoration-and-bleaching-technique-on-the-concentration-of-hydrogen-peroxide-in-the-pulp-chamber
#19
V Cavalli, B G Silva, S B Berger, G Abuna, F C Marson, Cpm Tabchoury, M Giannini
This study aimed to quantify the concentration of hydrogen peroxide into the pulp chamber in the presence or absence of adhesive enamel restorations and to analyze the resin-dentin interface of bleached groups. Bovine incisors (120) were randomly divided into three groups according to enamel treatment (n=40 each): (1) enamel without restoration (control); (2) enamel cavities (3 mm diameter × 1.5 mm depth) restored with a silorane-based (SB) system; or (3) enamel cavities (3 mm diameter × 1.5 mm depth) restored with a dimethacrylate-based (DB) system...
November 28, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27891467/an-in-vitro-comparative-study-of-shear-bond-strength-of-composite-resin-to-bleached-enamel-using-three-herbal-antioxidants
#20
Pratap Kumar Mukka, Nanda Kumar Komineni, Sambashivarao Pola, E Soujanya, Anand Ramtheerth Karne, Bhasker Nenavath, Sandeep Shiva, Pallavi Vuppunuthula
INTRODUCTION: If adhesive restorations are carried out imme-diately, the Shear Bond Strength (SBS) to bleached enamel is reduced. The use of antioxidants can be highlighted since it seems to be a more effective alternative to reduce or remove the residual oxygen and immediate improvement in SBS. AIM: The purpose of this in-vitro study was an attempt to regain the lost bond strength, for which, the comparison of SBS of composite resin to bleached enamel was carried out using various antioxidants i...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
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