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https://www.readbyqxmd.com/read/29675514/bonding-of-composite-to-base-materials-effects-of-adhesive-treatments-on-base-surface-properties-and-bond-strength
#1
Konstantinos Anastasiadis, Elisabeth A Koulaouzidou, Georgios Palaghias, George Eliades
PURPOSE: To evaluate the effects on the surface properties (morphology, roughness, microhardness, composition) and bond strength to composite of four types of base cements (Equia-Fil/EQF, Angelus white MTA/MTA, Biodentin/ BDN and IRM/IRM) when treated with phosphoric acid etching (PAE) or two self-etch adhesives (Select One Prime & Bond and Clearfil S3 Bond). MATERIALS AND METHODS: Disk-shaped specimens were prepared and stored until complete setting. The surfaces before and after treatments were examined by stereomicroscopy, optical profilometry, ATR-FTIR, and LV-SEM/EDX...
April 19, 2018: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/29675362/selective-dorsal-rhizotomy-current-state-of-practice-and-the-role-of-imaging
#2
REVIEW
David Graham, Kristian Aquilina, Kshitij Mankad, Neil Wimalasundera
Spastic diplegic cerebral palsy (CP) is the most common form of CP. A specific goal-oriented approach, tailored to the child, is essential to management in all forms of CP. Selective dorsal rhizotomy (SDR) is a neurosurgical procedure that permanently reduces lower limb spasticity in children with spastic diplegic CP. The current technique is performed through a single level laminectomy at the level of the conus and, with the aid of intraoperative electromyography (EMG), allows selective division of the afferent lumbosacral nerve roots...
March 2018: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29666407/an-implantable-peripheral-nerve-recording-and-stimulation-system-for-experiments-on-freely-moving-animal-subjects
#3
Byunghun Lee, Mukhesh K Koripalli, Yaoyao Jia, Joshua Acosta, M S E Sendi, Yoonsu Choi, Maysam Ghovanloo
A new study with rat sciatic nerve model for peripheral nerve interfacing is presented using a fully-implanted inductively-powered recording and stimulation system in a wirelessly-powered standard homecage that allows animal subjects move freely within the homecage. The Wireless Implantable Neural Recording and Stimulation (WINeRS) system offers 32-channel peripheral nerve recording and 4-channel current-controlled stimulation capabilities in a 3 × 1.5 × 0.5 cm3 package. A bi-directional data link is established by on-off keying pulse-position modulation (OOK-PPM) in near field for narrow-band downlink and 433 MHz OOK for wideband uplink...
April 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29657526/comparative-abrasive-wear-resistance-and-surface-analysis-of-dental-resin-based-materials
#4
Maleeha Nayyer, Shahreen Zahid, Syed Hammad Hassan, Salman Aziz Mian, Sana Mehmood, Haroon Ahmed Khan, Muhammad Kaleem, Muhammad Sohail Zafar, Abdul Samad Khan
Objective: The objective of this study was to assess the surface properties (microhardness and wear resistance) of various composites and compomer materials. In addition, the methodologies used for assessing wear resistance were compared. Materials and Methods: This study was conducted using restorative material (Filtek Z250, Filtek Z350, QuiXfil, SureFil SDR, and Dyract XP) to assess wear resistance. A custom-made toothbrush simulator was employed for wear testing...
January 2018: European Journal of Dentistry
https://www.readbyqxmd.com/read/29624369/ultrasensitive-and-facile-detection-of-microrna-via-a-portable-pressure-meter
#5
Lu Shi, Jing Lei, Bei Zhang, Baoxin Li, Chaoyong James Yang, Yan Jin
The upregulation of microRNA (miRNA) is highly related with some kinds of tumor, such as breast, prostate, lung, and pancreatic cancers. Therefore, for an important tumor biomarker, the point-of-care testing (POCT) of miRNA is of significant importance and is in great demand for disease diagnosis and clinical prognoses. Herein, a POCT assay for miRNA detection was developed via a portable pressure meter. Two hairpin DNA probes, H1 and H2, were ingeniously designed and functionalized with magnetic beads (MBs) and platinum nanoparticles (PtNPs), respectively, to form MBs-H1 and PtNPs-H2 complexes...
April 6, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29604511/a-bacterium-based-contact-assay-for-evaluating-the-quality-of-solid-samples-results-from-an-international-ring-test
#6
Catarina R Marques, Najoi El-Azhari, Fabrice Martin-Laurent, Pascal Pandard, Camille Meline, Alice L Petre, Suzanne Eckert, Jürgen Zipperle, Martin Váňa, Stanislav Maly, Lucie Šindelářová, Anna Slavíková Amemori, Jakub Hofman, Anu Kumar, Hai Doan, Mike McLaughlin, Elizabeth Richter, Jörg Römbke
The contact assay measuring the inhibition of Arthrobacter globiformis dehydrogenase activity as an endpoint to evaluate the toxicity of solid samples was tested in an international ring-test to validate its performance for ISO standardization (ISO/CD 18187). This work reports the results of the ring-test involving 9 laboratories from six countries. At least 8 valid data sets were obtained for each sample and more than three quarters of the participants attained the validity criteria defined in the standard...
March 20, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29604367/effects-of-n-methyl-d-aspartate-receptor-nmdar-uncompetitive-antagonists-in-a-delay-discounting-paradigm-using-a-concurrent-chains-procedure
#7
Justin R Yates, Benjamin T Gunkel, Katherine K Rogers, Kerry A Breitenstein, Mallory N Hughes, Anthony B Johnson, Sara M Sharpe
Impulsive choice is often assessed in rodents using a delay discounting (DD) paradigm in which the delay to a large reinforcer (LR) increases across the session. This procedure allows one to test the effects of pharmacological manipulations within a single session. Because discounting is influenced by sensitivity to reinforcer magnitude (SRM) and sensitivity to delayed reinforcement (SDR), applying quantitative analyses (e.g., fitting hyperbolic function) is important for determining the precise behavioral mechanisms being altered following drug administration...
March 28, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29594827/cytotoxic-and-biological-effects-of-bulk-fill-composites-on-rat-cortical-neuron-cells
#8
Hakan Kamalak, Aliye Kamalak, Ali Taghizadehghalehjoughi, Ahmet Hacımüftüoğlu, Kemal Alp Nalcı
The aim of this study was to investigate potential cellular responses and biological effects of new generation dental composites on cortical neuron cells in two different exposure times. The study group included five different bulk-fill flow able composites; Surefil SDR Flow, X-tra Base Flow, Venus Bulk Flow, Filtek Bulk Flow and Tetric-Evo Flow. They were filled in Teflon molds (Height: 4 mm, Width: 6 mm) and irradiated for 20 s. Cortical neuron cells were inoculated into 24-well plates. After 80% of the wells were coated, the 3 µm membrane was inserted and dental filling materials were added...
March 28, 2018: Odontology
https://www.readbyqxmd.com/read/29571907/the-effects-of-endodontic-access-cavity-preparation-design-on-the-fracture-strength-of-endodontically-treated-teeth-traditional-versus-conservative-preparation
#9
Taha Özyürek, Özlem Ülker, Ebru Özsezer Demiryürek, Fikret Yılmaz
INTRODUCTION: The aim of this study was to compare the fracture strengths of mandibular molar teeth prepared using traditional endodontic cavity (TEC) and conservative endodontic cavity (CEC) methods and restored using SDR (Dentsply Caulk, Milford, DE) and EverX Posterior (GC Dental, Tokyo, Japan) base composite materials. METHODS: A hundred mandibular first molar teeth were randomly divided into 5 groups. In group 1 (the control group), samples were kept intact...
March 20, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29564629/counteractive-mechanism-s-of-salicylic-acid-in-response-to-lead-toxicity-in-brassica-juncea-l-czern-cv-varuna
#10
Ashish Agnihotri, Praveen Gupta, Anuj Dwivedi, Chandra Shekhar Seth
Salicylic acid alleviates lead toxicity in Brassica juncea (L.) by promoting growth under non-stress and activating stress-defense mechanism (s) under lead stress conditions. It also boosts the ascorbate-glutathione cycle and thus helps in minimizing oxidative and DNA damage. Brassica juncea plants were exposed to different concentrations (0, 500, 1000 and 2000 mg kg-1 ) of lead (Pb) and subsequently sprayed with 0.5 mM of salicylic acid (SA) to check for morphological and leaf gas exchange parameters like transpiration rate (E), stomatal conductance (GH2 O), net photosynthetic rate (A) and maximum quantum yield of PS II (Fv /Fm )...
March 21, 2018: Planta
https://www.readbyqxmd.com/read/29549323/a-b-map-implying-the-first-eastern-rupture-of-the-nankai-trough-earthquakes
#11
K Z Nanjo, A Yoshida
The Nankai Trough megathrust earthquakes inflicted catastrophic damage on Japanese society and more widely. Most research is aimed at identifying strongly coupled regions that are considered as a major source of future disastrous earthquakes. Here we present a b-value map for the entire Nankai Trough zone. The b value, which represents the rate of occurrence of small earthquakes relative to larger ones, is inversely dependent on differential stresses, and has been used to detect highly stressed areas on fault planes in various tectonic situations...
March 16, 2018: Nature Communications
https://www.readbyqxmd.com/read/29523962/analysis-of-genetic-composition-and-transmitted-parental-heterozygosity-of-natural-2n-gametes-in-populus-tomentosa-based-on-ssr-markers
#12
Zhiqiang Han, Xining Geng, Kang Du, Congping Xu, Pengqiang Yao, Fengying Bai, Xiangyang Kang
Natural 2n female gametes and transmission of parental heterozygosity by natural 2n gametes in Populus tomentosa are reported for the first time, which provides a new approach to polyploid breeding. Naturally occurring 2n pollen is widespread in Populus tomentosa and plays an important role in polyploid breeding. However, the competitiveness of 2n pollen is lower than that of haploid pollen during pollination and fertilization, so 2n pollen is less efficient at fertilizing haploid female gametes to produce polyploids...
March 9, 2018: Planta
https://www.readbyqxmd.com/read/29513777/influence-of-polishing-system-on-the-surface-roughness-of-flowable-and-regular-viscosity-bulk-fill-composites
#13
Lindiane Cogo Rigo, Dimorvan Bordin, Vinicius Pavesi Fardin, Paulo G Coelho, Timothy G Bromage, Andre Reis, Ronaldo Hirata
This study evaluated the influence of polishing protocols on the surface roughness of flowable and regular bulk fill composites. Five bulk fill composites were tested: SureFil SDR Flow (SDR), Tetric EvoFlow Bulk fill (TEF), Filtek Bulk Fill Flowable (FIF), Tetric EvoCeram Bulk Fill (TEC), and Filtek Bulk Fill Posterior (FIP). Two polishing protocols were tested: Sof-Lex and Astropol. Astropol created a smoother surface for FIP (P < .05); however, the polishing protocol did not influence surface roughness on TEC (P > ...
March 7, 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29507469/is-the-level-of-cleanliness-using-segmental-boston-bowel-preparation-scale-associated-with-a-higher-adenoma-detection-rate
#14
Abimbola Adike, Matthew R Buras, Suryakanth R Gurudu, Jonathan A Leighton, Douglas O Faigel, Kevin C Ruff, Sarah B Umar, Francisco C Ramirez
Background: The impact of Boston bowel preparation scale (BBPS) scores on the adenoma detection rate (ADR) in each segment has not been adequately addressed. The aim of this study was to determine the association between segmental or overall ADR and serrated polyp detection rate (SDR) with segmental and total BBPS scores. Methods: All outpatient screening colonoscopies with documented BBPS scores were retrospectively reviewed at a tertiary institution from January to December 2013...
March 2018: Annals of Gastroenterology: Quarterly Publication of the Hellenic Society of Gastroenterology
https://www.readbyqxmd.com/read/29500263/identification-and-characterization-of-bacterial-enzymes-catalyzing-the-synthesis-of-1-8-dihydroxynaphthalene-a-key-precursor-of-dihydroxynaphthalene-melanin-from-sorangium-cellulosum
#15
Yusuke Sone, Shuto Nakamura, Makoto Sasaki, Fumihito Hasebe, Seung-Young Kim, Nobutaka Funa
1,8-Dihydroxynaphthalene (1,8-DHN) is a key intermediate in the biosynthesis of DHN melanin, which is specific to fungi. In this study, we characterized the enzymatic properties of the gene products of an operon consisting of soceCHS1 , bdsA , and bdsB from the gram-negative bacterium, Sorangium cellulosum Heterologous expression of soceCHS1 , bdsA , and bdsB in Streptomyces coelicolor caused secretion of a dark-brown pigment into the broth. High-performance liquid chromatography analysis of the broth revealed that the recombinant strain produced 1,8-DHN, indicating that the operon encoded a novel enzymatic system for the synthesis of 1,8-DHN...
March 2, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29462616/a-potential-substrate-binding-pocket-of-bdca-plays-a-critical-role-in-nadph-recognition-and-biofilm-dispersal
#16
Wen-Si Yang, Yuan Hong, Ying Zhang, Da-Cheng Wang, De-Feng Li, Yan-Jie Hou
Biofilm dispersal is characterized by the cell detachment from biofilms and expected to provide novel "anti-biofilm" approaches of prevention and treatment of biofilms in clinical and industrial settings. The E.coli protein BdcA has been identified as a biofilm dispersal factor and designed to be an important component in engineered applications to control biofilm formation. It belongs to short-chain dehydrogenase/reductase (SDR) family with the specific affinity to NADPH. Here, we show the structure of BdcA in complex with NADPH and confirm that NADPH binding is requisite for BdcA facilitating cell motility and increasing biofilm dispersal...
February 17, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29460513/the-effect-of-gingival-wall-location-on-the-marginal-seal-of-class-ii-restorations-prepared-with-a-flowable-bulk-fill-resin-based-composite
#17
P Segal, V Candotto, A Ben-Amar, M Eger, S Matalon, D Lauritano, Z Ormianer
SureFil SDR is a flowable resin-based composite that allows a single incremental bulk placement. The marginal seal of SureFil SDR at the gingival margins of class II restorations located apical to the cemento-enamel-junction (CEJ) has not been adequately evaluated compared to those located occlusal to the CEJ. Forty class II cavities were prepared in human molars. The gingival margins of 20 preparations were located 0.5 mm occlusal to the CEJ, and the other 20 preparations were located 0.5 mm apical to the CEJ...
January 2018: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/29459879/cold-induced-male-meiotic-restitution-in-arabidopsis-thaliana-is-not-mediated-by-ga-della-signaling
#18
Bing Liu, Nico De Storme, Danny Geelen
Short periods of cold stress induce male meiotic restitution and diploid pollen formation in Arabidopsis thaliana by specifically interfering with male meiotic cytokinesis. Similar alterations in male meiotic cell division and gametophytic ploidy stability occur when gibberellic acid (GA) signaling is perturbed in developing anthers. In this study, we found that exogenous application of GA primarily induces second division restitution (SDR)-type pollen in Arabidopsis, similar to what cold does. Driven by the close similarity in cellular defects, we tested the hypothesis that cold-induced meiotic restitution is mediated by GA-DELLA signaling...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29436570/the-effects-of-irradiance-and-exposure-time-on-the-surface-roughness-of-bulk-fill-composite-resin-restorative-materials
#19
Fahad I Alkhudhairy
To evaluate the surface roughness of 4 different bulk-fill resin-based composites cured using different irradiance levels. Methods: This in vitro study was performed in February 2017 to August 2017 at the College of Dentistry, King Saud University. Twenty-four specimens were prepared from each of the bulk-fill materials [Tetric N-Ceram (TNC), SonicFill (SF), Smart Dentin Replacement (SDR), and Filtek Bulk-Fill (FB)] using a brass metal mold, resulting in a total of 96 specimens, cured using a Bluephase N light curing unit...
February 2018: Saudi Medical Journal
https://www.readbyqxmd.com/read/29424954/discovery-of-a-short-chain-dehydrogenase-from-catharanthus-roseus-that-produces-a-novel-monoterpene-indole-alkaloid
#20
Anna Stavrinides, Evangelos Tatsis, Thu-Thuy Dang, Lorenzo Caputi, Clare Stevenson, David Lawson, Bernd Schneider, Sarah O'Connor
Monoterpene indole alkaloids, a large class of plant natural products, derive from the biosynthetic intermediate strictosidine aglycone. Strictosidine aglycone, which can exist as a variety of isomers, can be reduced to form numerous different structures. We have discovered a short chain alcohol dehydrogenase (SDR) from monoterpene indole alkaloid producing plants (Catharanthus roseus and Rauvolfia serpentina) that reduce strictosidine aglycone and produce an alkaloid that does not correspond to any previously reported compound...
February 9, 2018: Chembiochem: a European Journal of Chemical Biology
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