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https://www.readbyqxmd.com/read/29885101/accurate-modeling-of-temporal-correlations-in-rapidly-sampled-fmri-time-series
#1
Nadège Corbin, Nick Todd, Karl J Friston, Martina F Callaghan
Rapid imaging techniques are increasingly used in functional MRI studies because they allow a greater number of samples to be acquired per unit time, thereby increasing statistical power. However, temporal correlations limit the increase in functional sensitivity and must be accurately accounted for to control the false-positive rate. A common approach to accounting for temporal correlations is to whiten the data prior to estimating fMRI model parameters. Models of white noise plus a first-order autoregressive process have proven sufficient for conventional imaging studies, but more elaborate models are required for rapidly sampled data...
June 8, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29846408/improved-antimelanogenesis-and-antioxidant-effects-of-polysaccharide-from-cuscuta-chinensis-lam-seeds-after-enzymatic-hydrolysis
#2
Zi-Jun Liu, Ya-Lan Wang, Qi-Ling Li, Liu Yang
Cuscuta chinensis polysaccharide (CPS) was extracted using hot water and enzymatically hydrolyzed C. chinensis polysaccharide (ECPS) was produced by the mannase enzymatic hydrolysis process. The purpose of this research was to investigate the antimelanogenic activity of ECPS and CPS in B16F10 melanoma cells. The in vitro antioxidant activity was assessed by their ferric iron reducing power and DPPH free radical scavenging activities. The molecular mass distribution of polysaccharides was determined using SEC-MALLS-RI...
2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/29758152/efficacy-of-teeth-whitening-with-a-mouthwash-in-vitro-and-in-vivo-approaches
#3
Franco Gasparri, Bruce Richard Schemehorn, Andrea Zanardi
OBJECTIVES: Two different studies were conducted to evaluate the whitening efficacy of a mouthwash versus a placebo using in vitro and in vivomodels. The tested mouthwash was formulated with no oxidizing or abrasive agents containing chlorhexidine (CHX) and polyvinylpyrrolidone (PVP). METHODS: The purpose of the in vitro study was to determine whether the mouthwash formulation OC15AB could reduce the accumulation of staining in an accepted stain model. Bovine central incisors were cut to obtain enamel specimens of ~8 × 8 mm2...
March 2018: Journal of Clinical Dentistry
https://www.readbyqxmd.com/read/29519978/the-in-vitro-evaluation-of-the-effect-of-xyliwhite-probiotic-and-the-conventional-toothpastes-on-the-enamel-roughness-and-microhardness
#4
E Arat Maden, C Altun, G Guven Polat, F Basak
Aim: The aim of this study was to evaluate the effect of fluoride, Xylitol, Probiotic, and Whitening toothpastes on the permanent teeth enamel roughness and microhardness. Materials and Methods: One hundred and twenty teeth were randomly divided into 2 groups, each group having 60 samples. G1: The group in which enamel roughness was examined (n = 60). G2: The group in which enamel microhardness was examined (n = 60). Then, these groups were randomly divided into 4 groups among themselves (n = 15)...
March 2018: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29507652/36h-a-novel-potent-inhibitor-for-antimelanogenesis
#5
Li-Ching Lin, Chung-Yi Chen, Chia-Hung Kuo, Yun-Sheng Lin, Byeong Hee Hwang, Tina Kaiting Wang, Yueh-Hsiung Kuo, Hui-Min David Wang
N -Hydroxycinnamoylphenalkylamides (36H) exhibited both antioxidation and antityrosinase abilities. The compound was studied for its antioxidative properties, using a 1,1-diphenyl-2-picrylhydrazul- (DPPH-) scavenging test, a ferric ion-reducing antioxidant power assay (FRAP) assessment, and a metal-chelating power assay. The results showed that 36H had antioxidative capabilities in the DPPH-scavenging and ferric-reducing power examinations but the chelating power assay did not demonstrate antioxidative capability...
2018: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29486355/efficacy-of-er-cr-ysgg-laser-therapy-at-different-frequency-and-power-levels-on-bond-integrity-of-composite-to-bleached-enamel
#6
Fahad Alkhudhairy, Mustafa Naseem, Mohammed Bin-Shuwaish, Fahim Vohra
The aim was to evaluate the influence of Er, Cr: YSGG laser therapy at different pulse frequency and power levels on the bond strength and microleakage of bleached enamel. One hundred samples were bleached using in-office whitening agent. Bleached samples were divided into six subgroups, four subgroups was based on laser application parameters (pulse frequency 50 and 30 Hz; Power 4.5 & 6 W) one subgroup was treated with bleach (B) and the other was control (no bleaching, no laser application). All specimens including control were etched with 37% phosphoric acid and composite build-ups were performed...
February 24, 2018: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29412260/liberating-the-people-from-their-loathsome-practices-public-health-and-silent-racism-in-post-revolutionary-bolivia
#7
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
https://www.readbyqxmd.com/read/29340297/acetic-acid-guided-biopsies-in-barrett-s-surveillance-for-neoplasia-detection-versus-non-targeted-biopsies-seattle-protocol-a-feasibility-study-for-a-randomized-tandem-endoscopy-trial-the-abba-study
#8
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
https://www.readbyqxmd.com/read/29306418/seed-mediated-growth-of-au-ag-core-shell-nanorods-for-the-detection-of-ellagic-acid-in-whitening-cosmetics
#9
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
https://www.readbyqxmd.com/read/29297139/comparative-evaluation-of-image-quality-among-different-detector-configurations-using-area-detector-computed-tomography
#10
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...
March 2018: Radiological Physics and Technology
https://www.readbyqxmd.com/read/29234158/pkwmeb-integration-of-kruskal-wallis-test-with-empirical-bayes-under-polygenic-background-control-for-multi-locus-genome-wide-association-study
#11
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...
March 2018: Heredity
https://www.readbyqxmd.com/read/29200465/lack-of-conformity-to-new-local-dietary-preferences-in-migrating-captive-chimpanzees
#12
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
https://www.readbyqxmd.com/read/29178759/the-abrasive-effect-of-commercial-whitening-toothpastes-on-eroded-enamel
#13
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
https://www.readbyqxmd.com/read/29178705/effectiveness-of-dentifrices-with-new-formulations-for-the-treatment-of-dentin-hypersensitivity-a-meta-analysis
#14
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
https://www.readbyqxmd.com/read/29123632/management-of-post-endodontic-retreatment-pain-with-low-level-laser-therapy
#15
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
https://www.readbyqxmd.com/read/29056186/stain-removal-and-whitening-by-baking-soda-dentifrice-a-review-of-literature
#16
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
https://www.readbyqxmd.com/read/28469814/comparison-of-laser-and-power-bleaching-techniques-in-tooth-color-change
#17
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
https://www.readbyqxmd.com/read/28295030/plarmeb-integration-of-least-angle-regression-with-empirical-bayes-for-multilocus-genome-wide-association-studies
#18
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
https://www.readbyqxmd.com/read/28222156/toothbrush-abrasivity-in-a-long-term-simulation-on-human-dentin-depends-on-brushing-mode-and-bristle-arrangement
#19
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
https://www.readbyqxmd.com/read/27565821/ac-electrokinetic-drug-delivery-in-dentistry-using-an-interdigitated-electrode-assembly-powered-by-inductive-coupling
#20
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
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