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Power whitening

Nicole L Pacino
After the Movimiento Nacionalista Revolucionario (MNR) took power in the 1952 National Revolution, the party expanded rural public health programs to address what early twentieth-century elites called the "Indian problem:" the idea that indigenous culture was an impediment to Bolivia's modernization. After 1952, the MNR used public health as a project of cultural assimilation, and state-sponsored health programs sought to culturally whiten the population by transforming personal habits. This essay analyzes the language with which health workers discussed the indigenous population to show that despite the regime's intention to move away from defining the rural population on racial terms, medical and political elites continued to define indigenous customs as an obstacle to progress and a remnant of an antiquated past...
October 2017: História, Ciências, Saúde—Manguinhos
Fergus Chedgy, Carole Fogg, Kesavan Kandiah, Hugh Barr, Bernard Higgins, Mimi McCord, Ann Dewey, John De Caestecker, Lisa Gadeke, Clive Stokes, David Poller, Gaius Longcroft-Wheaton, Pradeep Bhandari
Background and study aims : Barrett's esophagus is a potentially pre-cancerous condition, affecting 375,000 people in the UK. Patients receive a 2-yearly endoscopy to detect cancerous changes, as early detection and treatment results in better outcomes. Current treatment requires random mapping biopsies along the length of Barrett's, in addition to biopsy of visible abnormalities. As only 13 % of pre-cancerous changes appear as visible nodules or abnormalities, areas of dysplasia are often missed...
January 2018: Endoscopy International Open
Yi Wang, Yang Zeng, Wensheng Fu, Pu Zhang, Ling Li, Cuiying Ye, Lan Yu, Xiaochun Zhu, Song Zhao
Seed-mediated growth has been employed as a simple and powerful means to the shape-controlled synthesis of metal nanocrystals. In this work, we apply the principle of seed-mediated growth in analytical chemistry, and achieve improved sensitivity due to the low energy barrier in the target-induced formation of bimetallic nanoparticles with core-shell structure. As a result, a simple, reliable, highly sensitive and selective method for the detection of ellagic acid (EA), a naturally occurring polyphenolic antioxidant, has been developed...
March 9, 2018: Analytica Chimica Acta
Yohei Miura, Katsuhiro Ichikawa, Ichiro Fujimura, Takanori Hara, Takashi Hoshino, Shinji Niwa, Masao Funahashi
The 320-detector row computed tomography (CT) system, i.e., the area detector CT (ADCT), can perform helical scanning with detector configurations of 4-, 16-, 32-, 64-, 80-, 100-, and 160-detector rows for routine CT examinations. This phantom study aimed to compare the quality of images obtained using helical scan mode with different detector configurations. The image quality was measured using modulation transfer function (MTF) and noise power spectrum (NPS). The system performance function (SP), based on the pre-whitening theorem, was calculated as MTF2/NPS, and compared between configurations...
January 2, 2018: Radiological Physics and Technology
Wen-Long Ren, Yang-Jun Wen, Jim M Dunwell, Yuan-Ming Zhang
Although nonparametric methods in genome-wide association studies (GWAS) are robust in quantitative trait nucleotide (QTN) detection, the absence of polygenic background control in single-marker association in genome-wide scans results in a high false positive rate. To overcome this issue, we proposed an integrated nonparametric method for multi-locus GWAS. First, a new model transformation was used to whiten the covariance matrix of polygenic matrix K and environmental noise. Using the transferred model, Kruskal-Wallis test along with least angle regression was then used to select all the markers that were potentially associated with the trait...
December 13, 2017: Heredity
Gillian L Vale, Sarah J Davis, Erica van de Waal, Steven J Schapiro, Susan P Lambeth, Andrew Whiten
Conformity to the behavioural preferences of others can have powerful effects on intragroup behavioural homogeneity in humans, but evidence in animals remains minimal. In this study, we took advantage of circumstances in which individuals or pairs of captive chimpanzees, Pan troglodytes, were 'migrated' between groups, to investigate whether immigrants would conform to a new dietary population preference experienced in the group they entered, an effect suggested by recent fieldwork. Such 'migratory-minority' chimpanzees were trained to avoid one of two differently coloured foods made unpalatable, before 'migrating' to, and then observing, a 'local-majority' group consume a different food colour...
February 2017: Animal Behaviour
Victor Mosquim, Beatriz Martines Souza, Gerson Aparecido Foratori Junior, Linda Wang, Ana Carolina Magalhães
PURPOSE: To evaluate the in vitro abrasive effect of commercial whitening toothpastes on eroded bovine enamel samples in respect to erosive tooth wear. METHODS: 72 bovine crowns were embedded, polished and subjected to the baseline profile analysis. The samples were then protected in 2/3 of the enamel surface and were randomly assigned to six groups (n= 12/group): G1: Oral-B 3D White, G2: Close-up Diamond Attraction Power White, G3: Sorriso Xtreme White 4D, G4: Colgate Luminous White, G5: Crest (conventional toothpaste), G6:erosion only (control)...
June 2017: American Journal of Dentistry
Christina Grünberg, Florian Bauer, Alexander Crispin, Michael Jakob, Reinhard Hickel, Miriam E Draenert
PURPOSE: This meta-analysis was conducted to evaluate if strontium-acetate- and arginine-containing dentifrices can significantly reduce dentin hypersensitivity (DH). METHODS: A systematic literature search was performed. The investigation period was from 2006 to 2015 with the search term "dentin hypersensitivity". Nine original articles were relevant. A network meta-analysis of combined z scores was performed. Pooled results from random effects models with their 95% confidence intervals are reported...
August 2017: American Journal of Dentistry
Mohammad Asnaashari, Hengameh Ashraf, Amir Houshang Daghayeghi, Seyed Masoud Mojahedi, Saranaz Azari-Marhabi
Introduction: Pharmacotherapy with analgesics and non-steroidal anti-inflammatory drugs has been traditionally used to relief post-operative pain of endodontic treatments. However, due to the side effects reported for these drugs, some efforts have been made to decrease the post-operative pain of the endodontic treatments through laser irradiation. The present study aimed to evaluate the effects of low level laser therapy (LLLT) on the reduction of pain after root canal retreatment. Methods: In this clinical trial, 61 patients requiring endodontic retreatments in posterior teeth were selected...
2017: Journal of Lasers in Medical Sciences
Yiming Li
BACKGROUND: Tooth discoloration may be caused by intrinsic or extrinsic stains or a combination of both. There are 2 major approaches to removing the stains, including the chemical mechanism using peroxides for tooth bleaching and the mechanical mechanism using abrasives in prophylactic pastes and dentifrices to remove stains, resulting in a whitening effect. Attempts have also been made to add a low concentration of peroxides to dentifrices to enhance their abrasive cleaning to remove tooth stains...
November 2017: Journal of the American Dental Association
Reza Fekrazad, Shervin Alimazandarani, Katayoun Am Kalhori, Hadi Assadian, Seyed-Mahdi Mirmohammadi
BACKGROUND: Laser-assisted bleaching uses laser beam to accelerate release of free radicals within the bleaching gel to decrease time of whitening procedure. The aim of this study was to compare the efficacy of power bleaching using Opalescence Xtra Boost® and laser bleaching technique using LaserSmile gel and diode laser as an activator in their tooth whitening capacity. MATERIAL AND METHODS: Student t test showed that the laser bleaching group significantly outperformed the power bleaching group in changing ∆E (p=0...
April 2017: Journal of Clinical and Experimental Dentistry
J Zhang, J-Y Feng, Y-L Ni, Y-J Wen, Y Niu, C L Tamba, C Yue, Q Song, Y-M Zhang
Multilocus genome-wide association studies (GWAS) have become the state-of-the-art procedure to identify quantitative trait nucleotides (QTNs) associated with complex traits. However, implementation of multilocus model in GWAS is still difficult. In this study, we integrated least angle regression with empirical Bayes to perform multilocus GWAS under polygenic background control. We used an algorithm of model transformation that whitened the covariance matrix of the polygenic matrix K and environmental noise...
June 2017: Heredity
Mozhgan Bizhang, Ilka Schmidt, Yong-Hee Patricia Chun, Wolfgang H Arnold, Stefan Zimmer
OBJECTIVE: The aim of this study was to evaluate the susceptibility of dentin to brushing abrasion using four different toothbrushes (rotating-oscillating, sonic and two types of manual toothbrushes) with the same brushing forces. METHODS: Dentin samples (n = 72) were selected from 72 impacted third molars. Half of the surface of dentin samples was covered with an adhesive tape, creating a protected and a freely exposed area in the same specimen. Brushing was performed with either a: sonic (Sonicare PowerUp, Philips GmbH, Hamburg, Germany), b: oscillating-rotating (Oral B Vitality Precisions Clean, Procter & Gamble, Schwalbach am Taunus, Germany) or two different manual toothbrushes c: flat trim brush head toothbrush (Dr...
2017: PloS One
Chris S Ivanoff, Jie Jayne Wu, Hadi Mirzajani, Cheng Cheng, Quan Yuan, Stepan Kevorkyan, Radostina Gaydarova, Desislava Tomlekova
AC electrokinetics (ACEK) has been shown to deliver certain drugs into human teeth more effectively than diffusion. However, using electrical wires to power intraoral ACEK devices poses risks to patients. The study demonstrates a novel interdigitated electrode arrays (IDE) assembly powered by inductive coupling to induce ACEK effects at appropriate frequencies to motivate drugs wirelessly. A signal generator produces the modulating signal, which multiplies with the carrier signal to produce the amplitude modulated (AM) signal...
October 2016: Biomedical Microdevices
Nam Young Kim, Hee Souk Kwon, Hyeon Yong Lee
BACKGROUND: This work presents the first report that A. rugosa could have tyrosinase and melanogenesis inhibition and that its activities also be improved by fermentation with Lactobacillus rhamnosus and Lactobacillus paracasei. It was found that the tyrosinase and melanogenesis inhibition was correlated with antioxidant activity of acacetin, the major biologically active substances in A. rugosa. AIMS: we pursued an improvement in tyrosinase and melanogenesis inhibition of A...
September 2017: Journal of Cosmetic Dermatology
Andrew Whiten, Gillian Allan, Siobahn Devlin, Natalie Kseib, Nicola Raw, Nicola McGuigan
The current study avoided the typical laboratory context to determine instead whether over-imitation-the disposition to copy even visibly, causally unnecessary actions-occurs in a real-world context in which participants are unaware of being in an experiment. We disguised a puzzle-box task as an interactive item available to the public within a science engagement zone of Edinburgh Zoo. As a member of the public approached, a confederate acting as a zoo visitor retrieved a reward from the box using a sequence of actions containing both causally relevant and irrelevant elements...
2016: PloS One
Meredith K Kupinski, Eric Clarkson
We present a new method for computing optimized channels for estimation tasks that is feasible for high-dimensional image data. Maximum-likelihood (ML) parameter estimates are challenging to compute from high-dimensional likelihoods. The dimensionality reduction from M measurements to L channels is a critical advantage of channelized quadratic estimators (CQEs), since estimating likelihood moments from channelized data requires smaller sample sizes and inverting a smaller covariance matrix is easier. The channelized likelihood is then used to form ML estimates of the parameter(s)...
June 1, 2016: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
R Lo Giudice, G Pantaleo, A Lizio, U Romeo, G Castiello, G Spagnuolo, G Lo Giudice
BACKGROUND: Auxiliary power sources (LED and laser) are used in in-office teeth bleaching techniques to accelerate the redox reaction of the whitening gel to increase ease of use, to improve comfort and safety, and to decrease the procedure time. OBJECTIVE: The aim this study is to evaluate the efficiency of the teeth whitening procedures performed with hydrogen peroxide and carbamide peroxide, LED or Laser activated. METHOD: 18 patients, affected by exogenous dyschromia, were treated with a bleaching agent composed by 35% hydrogen peroxide and 10% carbamide peroxide...
2016: Open Dentistry Journal
Chengjie G Huang, Zhubo D Zhang, Maurice J Chacron
It is commonly assumed that neural systems efficiently process natural sensory input. However, the mechanisms by which such efficient processing is achieved, and the consequences for perception and behaviour remain poorly understood. Here we show that small conductance calcium-activated potassium (SK) channels enable efficient neural processing and perception of natural stimuli. Specifically, these channels allow for the high-pass filtering of sensory input, thereby removing temporal correlations or, equivalently, whitening frequency response power...
April 18, 2016: Nature Communications
Tamara S Al-Karadaghi, Asmaa A Al-Saedi, Mohammed A Al-Maliky, Ali S Mahmood
This in vitro study aimed to investigate the whitening efficacy of 940 nm and 980 nm diode laser photoactivation in tooth bleaching by analysing pulp chamber temperature, as well as the change in tooth colour. Root canals of thirty extracted human lower premolars were prepared. Laserwhite* 20 bleaching agent containing 38% of hydrogen peroxide was photoactivated with 7 W output power of 940 nm and 980 nm diode lasers for 120 s. Bleaching gel reduced 27-29% of the temperature from reaching the pulp chamber...
December 2016: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
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