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https://www.readbyqxmd.com/read/29039965/scanning-electron-microscope-comparative-surface-evaluation-of-glazed-lithium-disilicate-ceramics-under-different-irradiation-settings-of-nd-yag-and-er-yag-lasers
#1
Josko Viskic, Drazen Jokic, Suzana Jakovljevic, Lana Bergman, Sladana Milardovic Ortolan, Senka Mestrovic, Ketij Mehulic
OBJECTIVE: To evaluate the surface of glazed lithium disilicate dental ceramics after irradiation under different irradiation settings of Nd:YAG and Er:YAG lasers using a scanning electron microscope (SEM). MATERIALS AND METHODS: Three glazed-press lithium disilicate ceramic discs were treated with HF, Er:YAG, and Nd:YAG, respectively. The laser-setting variables tested were laser mode, repetition rate (Hz), power (W), time of exposure (seconds), and laser energy (mJ)...
October 17, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/29029834/biochar-composite-membrane-for-high-performance-pollutant-management-fabrication-structural-characteristics-and-synergistic-mechanisms
#2
Abdul Ghaffar, Xiaoying Zhu, Baoliang Chen
Biochar, a natural sourced carbon-rich material, has been used commonly in particle shape for carbon sequestration, soil fertility and environmental remediation. Here, we report a facile approach to fabricate freestanding biochar composite membranes for the first time. Wood biochars pyrolyzed at 300 °C and 700 °C were blended with polyvinylidene fluoride (PVdF) in three percentages (10%, 30% and 50%) to construct membranes through thermal phase inversion process. The resultant biochar composite membranes possess high mechanical strength and porous structure with uniform distribution of biochar particles throughout the membrane surface and cross-section...
October 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29028394/active-sampling-system-for-gas-phase-analyzers
#3
Artem E Akmalov, Alexander A Chistyakov, Olga I Dubkova, Gennadii E Kotkovskii, Alexei V Sychev
The approaches for increasing a contact-free sampling distance up to 40 cm for a field asymmetric ion mobility spectrometer were investigated and implemented by use both the vortex flow made by a rotating impeller and the laser desorption of traces of low volatile explosives. The sampling device for a laser-based field asymmetric ion mobility spectrometer including a high-speed rotating impeller was designed and built with help of computer simulation of vortex and analytical flows. The dependence of a signal of trinitrotoluene vapors on a rotational speed of an impeller was obtained...
August 2017: European Journal of Mass Spectrometry
https://www.readbyqxmd.com/read/29028045/led-pumped-alexandrite-laser-oscillator-and-amplifier
#4
Pierre Pichon, Adrien Barbet, Jean-Philippe Blanchot, Frédéric Druon, François Balembois, Patrick Georges
Taking advantage of light-emitting-diode (LED) performance breakthrough driven by the lighting market, we report, to the best of our knowledge, the first LED-pumped chromium-doped crystal laser oscillator and amplifier based on alexandrite crystals (Cr(3+):BeAl2O4). We developed a Ce:YAG concentrator as the pumped source, illuminated by blue LEDs that can be easily power scaled. With 2200 LEDs (450 nm), the Ce:YAG concentrator can deliver to the gain medium up to 268 mJ at 10 Hz at 550 nm with a irradiance of 8...
October 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29028008/atmospheric-boundary-layer-co2-remote-sensing-with-a-direct-detection-lidar-instrument-based-on-a-widely-tunable-optical-parametric-source
#5
Erwan Cadiou, Dominique Mammez, Jean-Baptiste Dherbecourt, Guillaume Gorju, Jacques Pelon, Jean-Michel Melkonian, Antoine Godard, Myriam Raybaut
We report on the capability of a direct detection differential absorption lidar (DIAL) for range resolved and integrated path (IPDIAL) remote sensing of CO2 in the atmospheric boundary layer (ABL). The laser source is an amplified nested cavity optical parametric oscillator (NesCOPO) emitting approximately 8 mJ at the two measurement wavelengths selected near 2050 nm. Direct detection atmospheric measurements are taken from the ground using a 30 Hz frequency switching between emitted wavelengths. Results show that comparable precision measurements are achieved in DIAL and IPDIAL modes (not better than a few ppm) on high SNR targets such as near range ABL aerosol and clouds, respectively...
October 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29024063/influence-of-ration-composition-on-nutritive-and-digestive-variables-in-captive-giraffes-giraffa-camelopardalis-indicating-the-appropriateness-of-feeding-practice
#6
I Gussek, C Große-Brinkhaus, K-H Südekum, J Hummel
The nutrition of captive giraffe (Giraffa camelopardalis), a browsing ruminant, is challenging because browse availability is limited in zoos and rations need to be composed of compensatory feeds. In this study, ration composition for giraffes in 12 German zoos was documented and linked to animal variables that indicate suitability of nutrition. Rations differed in proportion of ration items and chemical composition resulting in various grades of accordance with feeding recommendations. An estimated daily metabolisable energy (ME) intake (MEI; mean ± SD) of 0...
October 10, 2017: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/29020475/association-khellin-and-308-nm-excimer-lamp-in-the-treatment-of-severe-alopecia-areata-in-a-child
#7
Samy Fenniche, Houda Hammami, Anissa Zaouak
Alopecia areata (AA) is an autoimmune inflammatory disorder of hair, characterized by non-scarring hair loss. 308-nm Excimer lamp (EL) has been reported as one effective modality in the treatment of AA. Khellin is a furanochromone photosensitizer whose chemical structure is close to psoralens and has previously proven its efficacy in vitiligo in association with UVA. We evaluated the efficacy and safety of a combination of topical khellin and 308-nm EL in the treatment of a refractory ophiasic AA (OAA), of 1-year evolution, in a 5-year-old boy...
October 11, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/29019393/tough-stretchable-compressive-novel-polymer-graphene-oxide-nanocomposite-hydrogels-with-excellent-self-healing-performance
#8
Chenguang Pan, Libin Liu, Qiang Chen, Qiang Zhang, Gailan Guo
Designing hydrogels with high mechanical properties without sacrificing their self-healing efficiencies remains great challenges. We have fabricated cationic polyacrylamide/graphene oxide (GO) hydrogels by free-radical polymerization of acrylamide (AM) and 2-(dimethylamino)ethylacrylatemethochloride (DAC) in the presence of GO. The mechanical properties and self-healing ability can be tuned by GO content and mass ratio of AM and DAC. The ionic bonds between DAC and GO and hydrogen bonds between AM and GO can efficiently dissipate energy and rebuild the networks...
October 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28994397/light-scattering-and-random-lasing-in-aqueous-suspensions-of-hexagonal-boron-nitride-nanoflakes
#9
Stephen Adrian O'Brien, Andrew Harvey, Aideen Griffin, Declan Mulcahy, Tony Donnelly, Jonathan N Coleman, John F Donegan, David McCloskey
Liquid phase exfoliation allows large scale production of 2D materials in solution. The particles are highly anisotropic and strongly scatter light. While spherical particles can be accurately and precisely described by a single parameter - the radius, 2D nanoflakes, however, cannot be so easily described. We investigate light scattering in aqueous solutions of 2D hexagonal boron nitride nanoflakes in the single and multiple scattering regimes. In the single scattering regime, the anisotropic 2D materials show a much stronger depolarisation of light when compared to spherical particles of similar size...
October 10, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28992034/the-effect-of-energy-restriction-on-fatty-acid-profiles-of-longissimus-dorsi-and-tissue-adipose-depots-in-sheep
#10
S Z Song, J P Wu, S G Zhao, D P Casper, B He, T Liu, X Lang, X Y Gong, L S Liu
Sheep production systems in northwest China depend mostly on natural grasslands. Seasonal growth and maturity fluctuations can cause periodical restrictions in food quality and quantity. These fluctuations, in turn, result in variability in fat deposition and fatty acid profiles in different fat depots. Consequently, the study objective was to compare fat deposition, intramuscular fat (IMF) percentage and fatty acid profiles of the longissimus dorsi (LD), kidney fat (KF), tail fat (TF), and subcutaneous fat (SF) in lambs under ME restrictions similar to seasonal changes observed in the natural grasslands of northwest China...
September 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28990799/the-effect-of-dietary-energy-protein-ratio-protein-quality-and-food-allocation-on-the-efficiency-of-utilisation-of-protein-by-broiler-chickens
#11
R M Gous, A S Faulkner, H K Swatson
Various theories have been proposed to explain the reduced performance of broilers when given feeds excessively high in protein, but a satisfactory solution to this problem had, up to now, not been found. Three experiments were conducted to test the hypothesis that the efficiency of utilisation of protein (ep) is a linear-plateau function of the ratio between the feed apparent metabolisable energy and digestible crude protein contents (AMEn: DCP), and that dietary protein quality, feed allocation and sex do not influence this relationship...
October 9, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28990796/homocysteine-levels-associate-with-subtle-changes-in-leukocyte-dna-methylation-an-epigenome-wide-analysis
#12
Pooja R Mandaviya, Dylan Aïssi, Koen F Dekkers, Roby Joehanes, Silva Kasela, Vinh Truong, Lisette Stolk, Diana van Heemst, M Arfan Ikram, Jan Lindemans, P Eline Slagboom, David-Alexandre Trégouët, André G Uitterlinden, Chen Wei, Phil Wells, France Gagnon, Marleen Mj van Greevenbroek, Bastiaan T Heijmans, Lili Milani, Pierre-Emmanuel Morange, Joyce Bj van Meurs, Sandra G Heil
AIM: Homocysteine (Hcy) is a sensitive marker of one-carbon metabolism. Higher Hcy levels have been associated with global DNA hypomethylation. We investigated the association between plasma Hcy and epigenome-wide DNA methylation in leukocytes. METHODS: Methylation was measured using Illumina 450 k arrays in 2035 individuals from six cohorts. Hcy-associated differentially methylated positions and regions were identified using meta-analysis. RESULTS: Three differentially methylated positions cg21607669 (SLC27A1), cg26382848 (AJUBA) and cg10701000 (KCNMA1) at chromosome 19, 14 and 10, respectively, were significantly associated with Hcy...
October 9, 2017: Epigenomics
https://www.readbyqxmd.com/read/28989121/protective-effect-of-adhesive-systems-associated-with-neodymium-doped-yttrium-aluminum-garnet-laser-on-enamel-erosive-abrasive-wear
#13
Erica Crastechini, Alessandra B Borges, Klaus Becker, Thomas Attin, Carlos Rg Torres
AIM: This study evaluated the efficacy of self-etching adhesive systems associated or not associated with the neodymium-doped yttrium aluminum garnet (Nd:YAG) laser on the protection against enamel erosive/abrasive wear. MATERIALS AND METHODS: Bovine enamel specimens were demineralized with 0.3% citric acid (5 minutes). The samples were randomly assigned to eight groups (n = 20): SB - Single Bond Universal (3M/ESPE); SB+L - Single Bond Universal + laser (80 mJ/10 Hz); FB - Futurabond U (Voco); FB+L -Futurabond U + laser; GEN - G-aenial bond (GC); GEN+L -G-aenial bond + laser; L - laser irradiation; and C - no treatment...
October 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28986527/behavior-of-human-periodontal-ligament-cells-on-dentin-surfaces-ablated-with-an-ultra-short-pulsed-laser
#14
Jing Liu, Oleh Andrukhov, Markus Laky, Sylvia Nürnberger, Andreas Moritz, Peijun Lyu, Xiaohui Rausch-Fan
This study aimed to evaluate the effects of an ultrashort pulsed laser (USPL) (1064 nm, 20 ps, 100 kHz) with different laser fluences (F, 4, 6, 8 J/cm(2)) and pulse overlaps (PO, 0, 50%) on human periodontal ligament cells (hPDLs) behavior. Dentin samples were ablated with USPL with different combinations of fluences and pulse overlaps; some samples were ablated with an Er:YAG laser (2940 nm, 150 µs, 100 mJ/pulse, 5 J/cm(2)) and some samples were ground with a carbide bur. Then hPDLs were grown on the samples after different treatments...
October 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28985311/response-to-quinn-mj-the-aetiology-of-arteriolar-injury-in-malignant-hypertension-a-letter-on-shantsila-a-lip-gyh-malignant-hypertension-revisited-does-this-still-exist-am-j-hypertension-2017
#15
https://www.readbyqxmd.com/read/28978911/a-point-based-mortality-prediction-system-for-older-adults-with-diabetes
#16
Y K Chang, L F Huang, S J Shin, K D Lin, K Chong, F S Yen, H Y Chang, S Y Chuang, T J Hsieh, C A Hsiung, C C Hsu
The mortality prediction models for the general diabetic population have been well established, but the corresponding elderly-specific model is still lacking. This study aims to develop a mortality prediction model for the elderly with diabetes. The data used for model establishment were derived from the nationwide adult health screening program in Taiwan in 2007-2010, from which we applied a 10-fold cross-validation method for model construction and internal validation. The external validation was tested on the MJ health screening database collected in 2004-2007...
October 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28978806/dock8-enforces-immunological-tolerance-by-promoting-il-2-signaling-and-immune-synapse-formation-in-tregs
#17
Erin Janssen, Sudha Kumari, Mira Tohme, Sumana Ullas, Victor Barrera, Jeroen Mj Tas, Marcela Castillo-Rama, Roderick T Bronson, Shariq M Usmani, Darrell J Irvine, Thorsten R Mempel, Raif S Geha
Patients deficient in the guanine nucleotide exchange factor DOCK8 have decreased numbers and impaired in vitro function of Tregs and make autoantibodies, but they seldom develop autoimmunity. We show that, similarly, Dock8-/- mice have decreased numbers and impaired in vitro function of Tregs but do not develop autoimmunity. In contrast, mice with selective DOCK8 deficiency in Tregs develop lymphoproliferation, autoantibodies, and gastrointestinal inflammation, despite a normal percentage and in vitro function of Tregs, suggesting that deficient T effector cell function might protect DOCK8-deficient patients from autoimmunity...
October 5, 2017: JCI Insight
https://www.readbyqxmd.com/read/28977563/short-sleep-duration-increases-metabolic-impact-in-healthy-adults-a-population-based-cohort-study
#18
Han-Bing Deng, Tony Tam, Benny Chung-Ying Zee, Roger Yat-Nork Chung, Xuefen Su, Lei Jin, Ta-Chien Chan, Ly-Yun Chang, Eng-Kiong Yeoh, Xiang Qian Lao
Objectives: The metabolic impact of inadequate sleep has not been determined in healthy individuals outside laboratories. This study aims to investigate the impact of sleep duration on five metabolic syndrome components in a healthy adult cohort. Methods: A total of 162121 adults aged 20-80 years (men 47.4%) of the MJ Health Database, who were not obese and free from major diseases, were recruited and followed up from 1996 to 2014. Sleep duration and insomnia symptoms were assessed by a self-administered questionnaire...
July 22, 2017: Sleep
https://www.readbyqxmd.com/read/28976846/polymerization-behavior-and-mechanical-properties-of-high-viscosity-bulk-fill-and-low-shrinkage-resin-composites
#19
S Shibasaki, T Takamizawa, K Nojiri, A Imai, A Tsujimoto, H Endo, S Suzuki, S Suda, W W Barkmeier, M A Latta, M Miyazaki
The present study determined the mechanical properties and volumetric polymerization shrinkage of different categories of resin composite. Three high viscosity bulk fill resin composites were tested: Tetric EvoCeram Bulk Fill (TB, Ivoclar Vivadent), Filtek Bulk Fill posterior restorative (FB, 3M ESPE), and Sonic Fill (SF, Kerr Corp). Two low-shrinkage resin composites, Kalore (KL, GC Corp) and Filtek LS Posterior (LS, 3M ESPE), were used. Three conventional resin composites, Herculite Ultra (HU, Kerr Corp), Estelite ∑ Quick (EQ, Tokuyama Dental), and Filtek Supreme Ultra (SU, 3M ESPE), were used as comparison materials...
October 4, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28976838/bulk-fill-composites-effectiveness-of-cure-with-poly-and-monowave-curing-lights-and-modes
#20
J K Gan, A U Yap, J W Cheong, N Arista, Cbk Tan
This study compared the effectiveness of cure of bulk-fill composites using polywave light-emitting diode (LED; with various curing modes), monowave LED, and conventional halogen curing lights. The bulk-fill composites evaluated were Tetric N-Ceram bulk-fill (TNC), which contained a novel germanium photoinitiator (Ivocerin), and Smart Dentin Replacement (SDR). The composites were placed into black polyvinyl molds with cylindrical recesses of 4-mm height and 3-mm diameter and photopolymerized as follows: Bluephase N Polywave High (NH), 1200 mW/cm(2) (10 seconds); Bluephase N Polywave Low (NL), 650 mW/cm(2) (18...
October 4, 2017: Operative Dentistry
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