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https://www.readbyqxmd.com/read/28210444/effect-of-two-different-tooth-bleaching-techniques-on-microhardness-of-giomer
#1
Soodabeh Kimyai, Mahmoud Bahari, Fereshteh Naser-Alavi, Soodabeh Behboodi
BACKGROUND: Tooth bleaching is a safe and conservative treatment modality to improve the esthetic appearance of discolored teeth. One of the problems with the use of bleaching agents is their possible effect on surface microhardness of resin-based materials. The present study was carried out to evaluate the effect of in-office and at-home bleaching on surface microhardness of giomer. MATERIAL AND METHODS: Seventy-five disk-shaped giomer samples (Beautifil II) were prepared and cured with a light-curing unit...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28207419/both-genome-and-cytosol-dynamics-change-in-e-coli-challenged-with-sublethal-rifampicin
#2
Michal Wlodarski, Bianca Raciti, Jurij Kotar, Marco Cosentino Lagomarsino, Gillian M Fraser, Pietro Cicuta
While the action of many antimicrobial drugs is well understood at the molecular level, a systems-level physiological response to antibiotics remains largely unexplored. This work considers fluctuation dynamics of both the chromosome and cytosol in Escherichia coli, and their response to sublethal treatments of a clinically important antibiotic, rifampicin. We precisely quantify the changes in dynamics of chromosomal loci and cytosolic aggregates (a rheovirus nonstructural protein known as μNS-GFP), measuring short time-scale displacements across several hours of drug exposure...
February 16, 2017: Physical Biology
https://www.readbyqxmd.com/read/28205434/recent-advances-on-magnetic-relaxation-switching-assay-based-nanosensors
#3
Yang Zhang, Hong Yang, Zhiguo Zhou, Kai Huang, Shi-Ping Yang, Gang Han
Magnetic relaxation switching assay (MRSw)-based nanosensors respond to the changes of transverse relaxation time (T2) of water molecules resulted from the analyte-induced aggregation / disaggregation of magnetic nanoparticles (MNPs). This strategy has been widely applied to the detections of various substrates from heavy metal ions to organic pollutants, proteins, nucleic acids, bacteria/viruses, and specific cells. Compared with other nanosensors, MRSw-based nanosensors not only are free from the background interferences, signal bleaching, and quenching but also overcome light scattering from samples without pre-treatments...
February 16, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28203432/acute-respiratory-distress-syndrome-and-chemical-burns-after-exposure-to-chlorine-containing-bleach-a-case-report
#4
Hong-Joon Shin, Jin-Sun Chang, Seong Ahn, Tae-Ok Kim, Cheol-Kyu Park, Jung-Hwan Lim, In-Jae Oh, Yu-Il Kim, Sung-Chul Lim, Young-Chul Kim, Yong-Soo Kwon
Chlorine-containing bleach can cause acute respiratory distress syndrome (ARDS) and chemical burns. However, simultaneous occurrence of the two conditions caused by this agent is very rare. We describe the case of a 74-year-old female who presented with shortness of breath and hemoptysis following accidental exposure to chlorine-containing bleach. She had second- to third-degree chemical burns on both buttocks and thighs, and received mechanical ventilation because of the development of ARDS. Mechanical ventilation was discontinued on day 6 of hospitalization because of the rapid improvement of hypoxemia, and the patient was transferred to another hospital for further management of the chemical burns on day 18...
January 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28203276/a-biorefinery-scheme-to-fractionate-bamboo-into-high-grade-dissolving-pulp-and-ethanol
#5
Zhaoyang Yuan, Yangbing Wen, Nuwan Sella Kapu, Rodger Beatson, D Mark Martinez
BACKGROUND: Bamboo is a highly abundant source of biomass which is underutilized despite having a chemical composition and fiber structure similar as wood. The main challenge for the industrial processing of bamboo is the high level of silica, which forms water-insoluble precipitates negetively affecting the process systems. A cost-competitive and eco-friendly scheme for the production of high-purity dissolving grade pulp from bamboo not only requires a process for silica removal, but also needs to fully utilize all of the materials dissolved in the process which includes lignin, and cellulosic and hemicellulosic sugars as well as the silica...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28197398/efficacy-of-quercetin-flavonoid-in-recovering-the-postbleaching-bond-strength-of-orthodontic-brackets-a-preliminary-study
#6
Mana Shamsedin, Valiollah Arash, Masoud Babaei Jahromi, Ali Akbar Moghadamnia, Manouchehr Rahmati Kamel, Fariba Ezoji, Ali Bijani, Samira Kavoli, Tania Ghasemi, Gholamhossein Ramezani
OBJECTIVES: To evaluate comparatively the effect of quercetin on postbleaching shear bond strength (SBS) and adhesive remnant index (ARI). MATERIALS AND METHODS: Intact maxillary premolars were divided randomly into 12 groups of 10 each: (1) bonding the bracket immediately after bleaching, (2) bonding 1 week after bleaching, (3-8) application of three experimental concentrations of quercetin (0.1%, 0.5%, and 1%) at two time durations (5 and 10 min), (9-10) application of the solvent of quercetin at two time periods (5 and 10 min), (11) application of 10% sodium ascorbate for 10 min, and (12) bonding the brackets on nonbleached teeth...
January 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/28193881/strong-signal-increase-in-sted-fluorescence-microscopy-by-imaging-regions-of-subdiffraction-extent
#7
Fabian Göttfert, Tino Pleiner, Jörn Heine, Volker Westphal, Dirk Görlich, Steffen J Sahl, Stefan W Hell
Photobleaching remains a limiting factor in superresolution fluorescence microscopy. This is particularly true for stimulated emission depletion (STED) and reversible saturable/switchable optical fluorescence transitions (RESOLFT) microscopy, where adjacent fluorescent molecules are distinguished by sequentially turning them off (or on) using a pattern of light formed as a doughnut or a standing wave. In sample regions where the pattern intensity reaches or exceeds a certain threshold, the molecules are essentially off (or on), whereas in areas where the intensity is lower, that is, around the intensity minima, the molecules remain in the initial state...
February 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28192678/assaying-the-stability-and-inactivation-of-aav-serotype-1-vectors
#8
Douglas B Howard, Brandon K Harvey
Adeno-associated virus (AAV) vectors are a commonplace tool for gene delivery ranging from cell culture to human gene therapy. One feature that makes AAV a desirable vector is its stability, in regard to both the duration of transgene expression and retention of infectivity as a viral particle. This study examined the stability of AAV serotype 1 (AAV1) vectors under different conditions. First, transducibility after storage at 4°C decreased 20% over 7 weeks. Over 10 freeze-thaw cycles, the resulting transduction efficiency became variable at 60-120% of a single thaw...
February 2017: Human Gene Therapy Methods
https://www.readbyqxmd.com/read/28186132/bacterial-community-dynamics-are-linked-to-patterns-of-coral-heat-tolerance
#9
Maren Ziegler, Francois O Seneca, Lauren K Yum, Stephen R Palumbi, Christian R Voolstra
Ocean warming threatens corals and the coral reef ecosystem. Nevertheless, corals can be adapted to their thermal environment and inherit heat tolerance across generations. In addition, the diverse microbes that associate with corals have the capacity for more rapid change, potentially aiding the adaptation of long-lived corals. Here, we show that the microbiome of reef corals is different across thermally variable habitats and changes over time when corals are reciprocally transplanted. Exposing these corals to thermal bleaching conditions changes the microbiome for heat-sensitive corals, but not for heat-tolerant corals growing in habitats with natural high heat extremes...
February 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28174567/in-vivo-microscale-measurements-of-light-and-photosynthesis-during-coral-bleaching-evidence-for-the-optical-feedback-loop
#10
Daniel Wangpraseurt, Jacob B Holm, Anthony W D Larkum, Mathieu Pernice, Peter J Ralph, David J Suggett, Michael Kühl
Climate change-related coral bleaching, i.e., the visible loss of zooxanthellae from the coral host, is increasing in frequency and extent and presents a major threat to coral reefs globally. Coral bleaching has been proposed to involve accelerating light stress of their microalgal endosymbionts via a positive feedback loop of photodamage, symbiont expulsion and excess in vivo light exposure. To test this hypothesis, we used light and O2 microsensors to characterize in vivo light exposure and photosynthesis of Symbiodinium during a thermal stress experiment...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28168711/voltage-sensitive-conductances-increase-the-sensitivity-of-rod-photoresponses-following-pigment-bleaching
#11
Johan Pahlberg, Rikard Fredriksen, Gabriel E Pollock, Kiyoharu J Miyagishima, Alapakkam P Sampath, M Carter Cornwall
A majority of our visual experience occurs during the day when a substantial fraction of the visual pigment in our photoreceptor cells is bleached. Under these conditions it is widely believed that rods are saturated and do not contribute substantially to downstream signaling. However, behavioral experiments on subjects with only rod function reveals that these individuals unexpectedly retain substantial vision in daylight. We sought to understand this discrepancy by characterizing the sensitivity of rod photoresponses following exposure to bright bleaching light...
February 7, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28168100/an-updated-assessment-of-symbiodinium-spp-that-associate-with-common-scleractinian-corals-from-moorea-french-polynesia-reveals-high-diversity-among-background-symbionts-and-a-novel-finding-of-clade-b
#12
Héloïse Rouzé, Gaël J Lecellier, Denis Saulnier, Serge Planes, Yannick Gueguen, Herman H Wirshing, Véronique Berteaux-Lecellier
The adaptative bleaching hypothesis (ABH) states that, depending on the symbiotic flexibility of coral hosts (i.e., the ability of corals to "switch" or "shuffle" their algal symbionts), coral bleaching can lead to a change in the composition of their associated Symbiodinium community and, thus, contribute to the coral's overall survival. In order to determine the flexibility of corals, molecular tools are required to provide accurate species delineations and to detect low levels of coral-associated Symbiodinium...
2017: PeerJ
https://www.readbyqxmd.com/read/28164200/contribution-of-the-phenolic-composition-to-the-antioxidant-anti-inflammatory-and-antitumor-potential-of-equisetum-giganteum-l-and-tilia-platyphyllos-scop
#13
Inés Jabeur, Natália Martins, Lillian Barros, Ricardo C Calhelha, Josiana Vaz, Lotfi Achour, Celestino Santos-Buelga, Isabel C F R Ferreira
Naturally-occurring phytochemicals have received pivotal attention in the last few years, due to the increasing evidence of biological activities. Thus, in the present study, the antioxidant, anti-inflammatory and antitumor potentials of hydroethanolic extracts rich in phenolic compounds obtained from Equisetum giganteum L. and Tilia platyphyllos Scop. were assessed and directly correlated with their content of phenolic compounds, by using HPLC-DAD-ESI/MS analysis. T. platyphyllos showed the higher bioactive potential, evaluated in terms of antioxidant (radical scavenging effects - 105 μg mL(-1), reducing power - 123 μg mL(-1), β-carotene bleaching inhibition - 167 μg mL(-1), and lipid peroxidation inhibition - 56 μg mL(-1)), anti-inflammatory (225 μg mL(-1) inhibited 50% of nitric oxide production) and antitumor (breast - 224 μg mL(-1); lung - 247 μg mL(-1); cervical - 195 μg mL(-1) and hepatocellular - 173 μg mL(-1) carcinoma cells) activity, without having cytotoxic effects (>400 μg mL(-1))...
February 6, 2017: Food & Function
https://www.readbyqxmd.com/read/28163347/biophysical-mechanism-of-transient-retinal-phototropism-in-rod-photoreceptors
#14
Xiaohui Zhao, Damber Thapa, Benquan Wang, Shaoyan Gai, Xincheng Yao
Oblique light stimulation evoked transient retinal phototropism (TRP) has been recently detected in frog and mouse retinas. High resolution microscopy of freshly isolated retinas indicated that the TRP is predominated by rod photoreceptors. Comparative confocal microscopy and optical coherence tomography (OCT) revealed that the TRP predominantly occurred from the photoreceptor outer segment (OS). However, biophysical mechanism of rod OS change is still unknown. In this study, frog retinal slices, which open a cross section of retinal photoreceptor and other functional layers, were used to test the effect of light stimulation on rod OS...
February 13, 2016: Proceedings of SPIE
https://www.readbyqxmd.com/read/28162249/impacts-of-turbidity-on-corals-the-relative-importance-of-light-limitation-and-suspended-sediments
#15
Pia Bessell-Browne, Andrew P Negri, Rebecca Fisher, Peta L Clode, Alan Duckworth, Ross Jones
As part of an investigation of the effects of water quality from dredging/natural resuspension on reefs, the effects of suspended sediment concentrations (SSCs) (0, 30, 100mgL(-1)) and light (~0, 1.1, 8.6molphotonsm(-2)d(-1)) were examined alone and in combination, on the corals Acropora millepora, Montipora capricornis and Porites spp. over an extended (28d) period. No effects were observed at any sediment concentrations when applied alone. All corals in the lowest light treatments lost chlorophyll a and discoloured (bleached) after a week...
February 2, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28159281/comparative-study-of-the-antioxidant-activities-of-some-lipase-catalyzed-alkyl-dihydrocaffeates-synthesized-in-ionic-liquid
#16
Somayeh Gholivand, Ola Lasekan, Chin Ping Tan, Faridah Abas, Leong Sze Wei
The solubility limitations of phenolic acids in many lipidic environments are now greatly improved by their enzymatic esterification in ionic liquids (ILs). Herein, four different ILs were tested for the esterification of dihydrocaffeic acid with hexanol and the best IL was selected for the synthesis of four other n-alkyl esters with different chain-lengths. The effect of alkyl chain length on the anti-oxidative properties of the resulted purified esters was investigated using β-carotene bleaching (BCB) and free radical scavenging method DPPH and compared with butylated hydroxytoluene (BHT) as reference compound...
June 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28159107/chlorine-triggered-de-alloying-of-auag-carbon-nanodots-towards-fabrication-of-a-dual-signalling-assay-combining-the-plasmonic-property-of-bimetallic-alloy-nanoparticles-and-photoluminescence-of-carbon-nanodots
#17
Zahra Mohammadpour, Afsaneh Safavi, Seyyed Hossein Abdollahi
Integration of Au-Ag alloy and fluorescent carbon nanodots (C-dots) into a single platform resulted in a new dual sensing assay for chlorine. Selective etching of Ag from AuAg@C-dots was transformed into: (i) colorimetric signal by surface plasmon resonance (SPR) tuning of the alloy and (ii) fluorimetric signal by perturbation of fluorescence energy transfer between C-dots and alloy nanoparticles. Fast oxidizing of silver atoms incorporated in the bimetallic structure induced by chlorine resulted in selective de-alloying of bimetallic hybrid nanoparticles and an intense visible change of the colloidal dispersion color...
March 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28157843/perifoveal-s-cone-and-rod-driven-temporal-contrast-sensitivities-at-different-retinal-illuminances
#18
Cord Huchzermeyer, Jan Kremers
We evaluated a technique for measuring temporal contrast sensitivities to sine-wave modulation driven by S-cones and rods in the perifovea using triple silent substitution. Isolating stimuli for S-cones and rods were created using an eight-channel, four-primary LED stimulator that has been validated before. Sensitivities were measured at 10 different temporal frequencies between 1 and 28 Hz in three normal observers at 14 different retinal illuminances between 0.07 and 587 photopic troland (phot Td) and at three different retinal illuminances over the same range in one S-cone monochromat...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157418/whitening-efficacy-of-whitening-mouth-rinses-used-alone-or-in-conjunction-with-carbamide-peroxide-home-whitening
#19
Jbs Oliveira, R S Sarlo, E Bresciani, Tmf Caneppele
OBJECTIVES: The aim of this study was to compare the effectiveness of whitening mouth rinses on teeth previously whitened or not, exposed to food dyes. METHODS AND MATERIALS: One hundred twenty enamel-dentin specimens, 3 mm in diameter, were obtained from bovine incisors. The specimens were stained for 14 days in staining broth. After staining, the initial color reading was performed via a spectrophotometer CM-2600d (Konica Minolta). Half of specimens were submitted to whitening (10% carbamide peroxide [CP]) for 14 days...
February 3, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28154479/three-new-species-and-nine-new-records-in-the-genus-arthonia-from-south-korea
#20
Beeyoung Gun Lee, Jae-Seoun Hur
Arthonia coreana, Arthonia superpallens, and Arthonia zelkovae are new species from South Korea. All new species are in the Euarthonia tribe, based on the key characteristics of colorless hypothecium and multi-cellular spores. A. coreana has a dull brownish hypophloedal thallus without bleaching and rounded or curved big apothecia in comparison with those of Arthonia punctiformis. A. coreana consistently exhibits 4-septate ascospores, which is a distinctive characteristic that distinguishes it from other Arthonia species...
December 2016: Mycobiology
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