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https://www.readbyqxmd.com/read/29468599/determination-of-nicotine-content-in-teeth-submitted-to-prophylaxis-and-in-office-bleaching-by-gas-chromatography-mass-spectrometry-gc-ms
#1
Juliana L de Geus, Flávio L Beltrame, Mei Wang, Bharathi Avula, Ikhlas A Khan, Alessandro D Loguercio, Stella Kossatz, Alessandra Reis
OBJECTIVES: The objective of this study was to evaluate the dental color exposed to acute cigarette smoke treatment and quantify the amount of nicotine in samples exposed to cigarette smoke, after dental prophylaxis and after in-office bleaching. MATERIALS AND METHODS: Sixty-nine healthy human molars were subjected to cigarette smoke in a cigarette machine. The teeth were divided into three groups: positive control, prophylaxis, and bleaching. Forty cycles of smoke exposition with duration of 15 min each were performed using 10 cigarettes (positive control)...
February 21, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29468151/combination-of-virtual-screening-protocol-by-in-silico-toward-the-discovery-of-novel-4-hydroxyphenylpyruvate-dioxygenase-inhibitors
#2
Ying Fu, Yi-Na Sun, Ke-Han Yi, Ming-Qiang Li, Hai-Feng Cao, Jia-Zhong Li, Fei Ye
4-Hydroxyphenylpyruvate dioxygenase (EC 1.13.11.27, HPPD) is a potent new bleaching herbicide target. Therefore, in silico structure-based virtual screening was performed in order to speed up the identification of promising HPPD inhibitors. In this study, an integrated virtual screening protocol by combining 3D-pharmacophore model, molecular docking and molecular dynamics (MD) simulation was established to find novel HPPD inhibitors from four commercial databases. 3D-pharmacophore Hypo1 model was applied to efficiently narrow potential hits...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29468040/dominance-of-endozoicomonas-bacteria-throughout-coral-bleaching-and-mortality-suggests-structural-inflexibility-of-the-pocillopora-verrucosa-microbiome
#3
Claudia Pogoreutz, Nils Rädecker, Anny Cárdenas, Astrid Gärdes, Christian Wild, Christian R Voolstra
The importance of Symbiodinium algal endosymbionts and a diverse suite of bacteria for coral holobiont health and functioning are widely acknowledged. Yet, we know surprisingly little about microbial community dynamics and the stability of host-microbe associations under adverse environmental conditions. To gain insight into the stability of coral host-microbe associations and holobiont structure, we assessed changes in the community structure of Symbiodinium and bacteria associated with the coral Pocillopora verrucosa under excess organic nutrient conditions...
February 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29466906/melanin-bleaching-with-warm-hydrogen-peroxide-and-integrated-immunohistochemical-analysis-an-automated-platform
#4
Chia-Hsing Liu, Chih-Hung Lin, Min-Jan Tsai, Yu-Hsuan Chen, Sheau-Fang Yang, Kun-Bow Tsai
OBJECTIVE: Diagnosing melanocytic lesions is among the most challenging problems in the practice of pathology. The difficulty of physically masking melanin pigment and the similarity of its color to commonly used chromogens often complicate examination of the cytomorphology and immunohistochemical staining results for tumor cells. Melanin bleach can be very helpful for histopathological diagnosis of heavily pigmented melanocytic lesions. Although various depigmentation methods have been reported, no standardized methods have been developed...
February 1, 2018: International Journal of Surgical Pathology
https://www.readbyqxmd.com/read/29463894/coral-bleaching-from-a-single-cell-perspective
#5
Daniel Aagren Nielsen, Katherina Petrou, Ruth D Gates
Ocean warming is resulting in increased occurrence of mass coral bleaching; a response in which the intracellular algal endosymbionts (Symbiodinium sp.) are expelled from the coral host due to physiological stress. This detrimental process is often attributed to overproduction of reactive oxygen species (ROS) that leak out of the endosymbionts and causes damage to the host cell, though direct evidence validating this link is limited. Here, for the first time, we used confocal microscopy and fluorescent dyes to investigate if endosymbiont ROS production significantly and predictably affects physiological parameters in its host cell...
February 20, 2018: ISME Journal
https://www.readbyqxmd.com/read/29461811/%C3%AE-2-so-2-linkage-photoisomer-of-an-osmium-coordination-complex
#6
Jacqueline M Cole, Jose de J Velazquez-Garcia, David J Gosztola, SuYin Grass Wang, Yu-Sheng Chen
We report the discovery of an η2 -SO2 linkage photoisomer in the osmium pentaammine coordination complex, [Os(NH3 )5 (SO2 )][Os(NH3 )5 (HSO3 )]Cl4 (1). Its dark- and light-induced crystal structures are determined via synchrotron X-ray crystallography, at 100 K, where the photoinduced state is metastable in a single crystal that has been stimulated by 505 nm light for 2.5 h. The SO2 photoisomer in the [Os(NH3 )5 (SO2 )]2+ cation contrasts starkly with the photoinactivity of the HSO3 ligand in its companion [Os(NH3 )5 (HSO3 )]+ cation within the crystallographic asymmetric unit of this single crystal...
February 20, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29461543/-external-cervical-root-resorption
#7
C J Warnsinck, H Shemesh
External cervical root resorption begins at the root surface as result of odontoclastic activity in the cervical area and is progressive in character. The pulp is only affected at a later stage of the process. The aetiology and pathogenesis of external cervical root resorption is not fully understood. Possible predisposing factors are, among others, orthodontic treatment, trauma, internal bleaching, damaged cemento-enamel junction, bruxism and hypoxia. A 'pink spot' often is the first clinical sign and a two-dimensional radiograph usually presents an amorphous radiolucency with undefined borders...
February 2018: Nederlands Tijdschrift Voor Tandheelkunde
https://www.readbyqxmd.com/read/29459692/isolation-of-uracil-auxotroph-mutants-of-coral-symbiont-alga-for-symbiosis-studies
#8
Yuu Ishii, Shinichiro Maruyama, Konomi Fujimura-Kamada, Natsumaro Kutsuna, Shunichi Takahashi, Masakado Kawata, Jun Minagawa
Coral reef ecosystems rely on stable symbiotic relationship between the dinoflagellate Symbiodinium spp. and host cnidarian animals. The collapse of such symbiosis could cause coral 'bleaching' and subsequent host death. Despite huge interest on Symbiodinium, lack of mutant strains and readily available genetic tools have hampered molecular research. A major issue was the tolerance to marker antibiotics. Here, we isolated Symbiodinium mutants requiring uracil for growth, and hence, useful in transformation screening...
February 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29458103/zinc-oxide-nanorod-clusters-deposited-seaweed-cellulose-sheet-for-antimicrobial-activity
#9
Priyank L Bhutiya, Mayur S Mahajan, M Abdul Rasheed, Manoj Pandey, S Zaheer Hasan, Nirendra Misra
Seaweed cellulose was isolated from green seaweed Ulva fasciata using a common bleaching agent. Sheet containing porous mesh was prepared from the extracted seaweed crystalline cellulose along with zinc oxide (ZnO) nanorod clusters grown over the sheet by single step hydrothermal method. Seaweed cellulose and zinc oxide nanorod clusters deposited seaweed cellulose sheet was characterized by FT-IR, XRD, TGA, and SEM-EDX. Morphology showed that the diameter of zinc oxide nanorods were around 70 nm. Zinc oxide nanorod clusters deposited on seaweed cellulose sheet gave remarkable antibacterial activity towards gram-positive (Staphylococcus aureus, Bacillus ceresus, Streptococcus thermophilis) and gram-negative (Escherichia coli, Pseudomonas aeruginous) microbes...
February 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29456004/the-effect-of-oxyalkylation-and-application-of-polymer-dispersions-on-the-thermoformability-and-extensibility-of-paper
#10
Jarmo Kouko, Harri Setälä, Atsushi Tanaka, Alexey Khakalo, Jarmo Ropponen, Elias Retulainen
Wood fiber-based packaging materials, as renewable materials, have growing market potential due to their sustainability. A new breakthrough in cellulose-based packaging requires some improvement in the mechanical properties of paper. Bleached softwood kraft pulp was mechanically treated, in two stages, using high- and low-consistency refining, sequentially. Chemical treatment of pulp using the oxyalkylation method was applied to modify a portion of fiber material, especially the fiber surface, and its compatibility with polymer dispersions including one carbohydrate polymer...
April 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29455372/effectiveness-and-effect-of-non-vital-bleaching-on-the-quality-of-life-of-patients-up-to-6-months-post-treatment-a-randomized-clinical-trial
#11
Cristian Bersezio, Paulina Ledezma, Carla Mayer, Oriana Rivera, Osmir Batista Oliveira Junior, Eduardo Fernández
OBJECTIVES: The aim of this study was to evaluate the esthetic perception of patients at 6 months after bleaching of non-vital teeth with 35% of hydrogen peroxide and 37% of carbamide peroxide using a walking bleach technique. We also assessed psychosocial impacts as well as the clinical effectiveness and stability of the color change. MATERIALS AND METHODS: The teeth bleaching treatment was randomly assigned to two groups according to the bleaching agent used: G1 HP = 35% of hydrogen peroxide (n = 25) and G2 CP = 37% of carbamide peroxide (n = 25)...
February 17, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29453005/post-mortem-quetiapine-concentrations-in-hair-segments-of-psychiatric-patients-correlation-between-hair-concentration-dose-and-concentration-in-blood
#12
Kamilla Nyborg Günther, Sys Stybe Johansen, Marie Katrine Klose Nielsen, Petra Wicktor, Jytte Banner, Kristian Linnet
Drug analysis in hair is useful when seeking to establish drug intake over a period of months to years. Segmental hair analysis can also document whether psychiatric patients are receiving a stable intake of antipsychotics. This study describes segmental analysis of the antipsychotic drug quetiapine in post-mortem hair samples from long-term quetiapine users by ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) analysis. The aim was to obtain more knowledge on quetiapine concentrations in hair and to relate the concentration in hair to the administered dose and the post-mortem concentration in femoral blood...
February 3, 2018: Forensic Science International
https://www.readbyqxmd.com/read/29448088/antioxidant-activity-and-total-phenolic-content-of-ethanolic-extract-of-pomegranate-peels-juice-and-seeds
#13
Zahra Derakhshan, Margherita Ferrante, Marzieh Tadi, Farnoosh Ansari, Ali Heydari, Motahreh Sadat Hosseini, Gea Oliveri Conti, Elham Khalili Sadarabad
Pomegranate (Punica granatum L.) is extensively cultivated in Middle East especially in Iran. For centuries, this fruit has been used in Iranian herbal medicine. Pomegranate peel, seed and juice contain considerable amounts of phenolic compounds and have antioxidant activity. Pomegranate peels, juice and seeds from three regions of Natanz, Shahreza, and Doorak were obtained. Antioxidant activity, total phenolic, flavonoids, and flavonols contents of pomegranate peels, seeds and juices extracts were analyzed...
February 12, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29448022/photosynthesis-and-mineralogy-of-jania-rubens-at-low-ph-high-pco-2-a-future-perspective
#14
Lucia Porzio, Maria Cristina Buia, Viviana Ferretti, Maurizio Lorenti, Manuela Rossi, Marco Trifuoggi, Alessandro Vergara, Carmen Arena
Corallinales (Rhodophyta) are high Mg-calcite macroalgae and are considered among the most vulnerable organisms to ocean acidification (OA). These sensitive species play fundamental roles in coastal systems as food source and settlement promoters as well as being involved in reef stabilization, and water carbonate balance. At present only a few studies are focused on erect calcifying macroalgae under low pH/high pCO 2 and the contrasting results make difficult to predict the ecological consequences of the OA on the coralline algae...
February 12, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29446268/tooth-color-changes-and-sensitivity-in-patients-undergoing-dental-bleaching-with-10-hydrogen-peroxide-using-customized-trays-or-strips-a-randomized-clinical-trial
#15
Bianca Rossi, Patrícia M Freitas, Tamara K Tedesco, Flávia Gonçalves, Leila S Ferreira
BACKGROUND: This paper aimed to compare the tooth color changes and sensitivity in patients undergoing dental bleaching with 10% hydrogen peroxide using customized trays or strips as delivering systems. METHODS: A total of 50 patients aged between 18-30 years old were assigned into two groups (N.=25) according to the bleaching treatment: tray (TB) or strips (SB). For both techniques, the patients underwent a 30-minute application of 10% hydrogen peroxide twice a day for seven days...
April 2018: Minerva Stomatologica
https://www.readbyqxmd.com/read/29442887/extraction-of-cellulose-micro-whiskers-from-rice-husk-a-greener-approach
#16
Rajeev Kr Sharma, Rajesh Kumar, Anirudh P Singh
Herein, we report a greener, total chlorine free, ultrasonic physicochemical process of extraction and purification of cellulose micro-whiskers from rice husk. The initial step involves the treatment of the rice husk with a concentrated aqueous alkali solution for the duration of 6 h at 80 °C in round bottom flask in order to completely dissolve lignin and silica. After alkali pretreatment, the product obtained was thoroughly washed with distilled water, filtered and dried. The dried product was subjected to mechanical treatment followed by a bleaching process...
May 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442766/electrochromic-properties-of-nio-x-films-deposited-by-dc-magnetron-sputtering
#17
Jianhua Qiu, Zhao Chen, Tianxiang Zhao, Zhihui Chen, Wenjing Chu, Ningyi Yuan, Jianning Ding
Nickel oxide (NiOx) films were deposited onto ITO-coated glass at room temperature by DC magnetron sputtering and the electrochromic properties were investigated. The effects of film thickness on structure, morphology, electrochemical and electrochromic properties of NiOx films were systematically studied. X-ray diffraction and scanning electron microscopy results indicate NiOx films have the polycrystalline structure and the crystallinity improves with the increase of thickness. In atomic force microscopy analysis, the surface roughness of NiOx films increases as the thickness increases and large roughness is obtained in the films of more than 300 nm...
June 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442661/effect-of-o%C3%A2-concentration-on-the-electrochromic-properties-of-nio-x-films
#18
Jianhua Qiu, Zhao Chen, Tianxiang Zhao, Zhihui Chen, Wenjing Chu, Ningyi Yuan, Jianning Ding
Nickel oxide (NiOx) films were deposited onto ITO-coated glass at room temperature by DC magnetron sputtering in Ar/O2 mixing gas. The effect of O2 concentration on structure, morphology, electrochemical and electrochromic properties of NiOx films was systematically investigated. X-ray diffraction results showed NiOx films had the polycrystalline structure. NiOx films deposited at low O2 concentration had the preferred (200) peak. On the other hand, the films exhibited the strong (111) peak at high O2 concentration...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442439/wet-imprinting-of-channel-type-superstructures-in-nanostructured-titania-thin-films-at-low-temperatures-for-hybrid-solar-cells
#19
Lin Song, Tianyi Wang, Volker Körstgens, Weijia Wang, Nitin Saxena, Christoph J Schaffer, Thomas Fröschl, Nicola Hüsing, Sigrid Bernstorff, Peter Müller-Buschbaum
Hierarchically structured titania films, exhibiting interconnected foam-like nanostructures and large scale channel-type superstructures, are achieved in an energy saving way at low temperatures by a polymer template-assisted sol-gel synthesis in combination with a wet imprinting process. The surface morphology is probed with scanning electron microscopy and atomic force microscopy, while the inner morphology is characterized with grazing incidence small-angle x-ray scattering measurements. Compared to the initial hybrid films, the titania films showed reduced structure sizes caused by the polymer template removal...
February 14, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29439773/effect-of-an-experimental-desensitizing-agent-on-reduction-of-bleaching-induced-tooth-sensitivity-a-triple-blind-randomized-clinical-trial
#20
Sibelli Olivieri Parreiras, Anna Luiza Szesz, Fabiana Madalozzo Coppla, Eveline Claudia Martini, Paulo Vitor Farago, Alessandro D Loguercio, Alessandra Reis
BACKGROUND: In this randomized study, split-mouth, triple-blind clinical trial, the authors evaluated the efficacy of a desensitizing gel that contained 5% potassium nitrate and 5% glutaraldehyde applied before in-office bleaching with 35% hydrogen peroxide (HP). METHODS: Treatment with the desensitizing or placebo control gels was randomly assigned to one-half of the maxillary teeth of 42 patients in a split-mouth design. The desensitizing gels were applied and maintained in contact with the tooth enamel for 10 minutes, followed by 2 HP bleaching sessions separated by 1 week...
February 10, 2018: Journal of the American Dental Association
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