Search results for: glass
#33452720 
2021/01/16
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Analysis of marginal integrity in dentistry composite fillings with flow layer under compression test.
Currently, composite materials dominate among the restorative materials used for direct aesthetic filling. Reinforcement of composites with glass fibers allows for the transfer of greater loads and better durability between the tooth tissue and the filling polymer. New approach to bonding liquid materials with composite with glass fillers is to introduce an additional protective barrier to load a higher force that is, compression test. So, the aim of the study was to analyze the structure of composite fillings, their integrity with tooth tissues and evaluation on the influence of the liquid composite layer on the strength of strength in the compression test. Moreover, the influence of thermal shocks on the bonding with the tooth tissues in the compression test was investigated. According to the results obtained in current research, using the flow composite as a combination with the fiber composite leads to a significant increase in mechanical properties, particularly in the compression test. HIGHLIGHTS: If flow-type composite fluid material are, the greater is strength of composite fillings. Glass fibers composite increase the mechanical strength.Monika Ostapiuk, Janusz Tarczydło, Iwona Łuszczewska-Sierakowska, Radosław Śledź, Barbara Tymczyna-Borowicz
2937 related Products with: Analysis of marginal integrity in dentistry composite fillings with flow layer under compression test.
500 tests
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#33452394 2021/01/15
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Evaluation of poor prognostic factors of respiratory related death in microscopic polyangiitis complicated by interstitial lung disease.
The prognosis of microscopic polyangiitis (MPA) with interstitial lung disease (ILD) is significantly worse than that of MPA without ILD. However, the clinical characteristics in MPA-ILD, especially poor prognostic factors, are not elucidated. We evaluated demographic, clinical, laboratory, and radiological findings, treatments, and outcomes of 80 patients with MPA, and investigated prognostic factors of respiratory-related death in patients with myeloperoxidase (MPO)-anti-neutrophil cytoplasmic antibody (ANCA) positive MPA-ILD. Ground-glass opacity and fibrosis were evaluated as scores on high-resolution computed tomography (HRCT). The presence of ILD was consistent with a high risk of respiratory-related death (hazard ratio, 4.8; P = 0.04). Multivariable logistic regression analyses using propensity scoring showed right or left lower lobe fibrosis score to be significantly associated with respiratory-related death (P = 0.0005 and 0.0045, respectively). A right or left lower lobe fibrosis score ≥ 2, indicating the presence of honeycombing at 1 cm above the diaphragm, was determined to be the best cut-off value indicating a poor prognosis. The 5-year survival rate was significantly lower in patients with right or left lower lobe fibrosis score ≥ 2 (survival rates: 37% and 19%, respectively) than those with a score < 2 (71% and 68%, respectively) (P = 0.002 and 0.0007, respectively). These findings suggest that the presence of honeycomb lesions in bilateral lower lobes on chest HRCT was associated with respiratory-related death in patients with MPO-ANCA positive MPA-ILD.Shogo Matsuda, Takuya Kotani, Takayasu Suzuka, Takao Kiboshi, Keisuke Fukui, Minako Wakama, Takaaki Ishida, Youhei Fujiki, Hideyuki Shiba, Koji Nagai, Kenichiro Hata, Takeshi Shoda, Yuri Ito, Shigeki Makino, Tohru Takeuchi
1158 related Products with: Evaluation of poor prognostic factors of respiratory related death in microscopic polyangiitis complicated by interstitial lung disease.
1 mg100ug Lyophilized
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#33452373 2021/01/15
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The response of zircon to the extreme pressures and temperatures of a lightning strike.
Hypervelocity impacts can produce features in zircon that are not normally produced by endogenic processes. However, lightning can also induce extreme pressure-temperature excursions, and its effect on zircon has not been studied. With the aim to recognise features that form in response to extreme pressure-temperature excursions but are not unique to hypervelocity impacts, we imaged and undertook microstructural characterization of zircon in a fulgurite (a tubular body of glass and fused clasts that formed in response to a lightning strike). We document zircon with granular ZrO and rims of vermicular ZrO, features which vary in abundance with increasing distance from the fulgurite's central void. This indicates that these features formed in response to the lightning strike. Zircon dissociation to ZrO and SiO is a high-temperature, relatively low-pressure phenomenon, consistent with previous suggestions that lightning strikes involve extreme temperatures as well as pressures greater than those usually generated in Earth's crust but rarely > 10 GPa. The rims of monoclinic ZrO record crystallographic evidence for precursor cubic ZrO, demonstrating that cubic ZrO is not unique to hypervelocity impacts. Given the likelihood that this fulgurite experienced pressures of, at most, a few GPa, evidence for cubic ZrO indicates peak temperatures > 2000 °C.Gavin G Kenny, Matthew A Pasek
1429 related Products with: The response of zircon to the extreme pressures and temperatures of a lightning strike.
100.00 ul 100ul100.00 ul1100
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#33452369 2021/01/15
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Nonconventional driving force for selective oxidative C-C coupling reaction due to concurrent and curious formation of Ag.
Is it possible to 'explore' metal's intrinsic property-a cohesive interaction-which naturally transform M into an aggregate or a particle or film for driving oxidative C-C bond formation? With this intention, reduction of [Ag(NH)] to Ag with concurrent oxidation of different phenols/naphthols to biphenyls was undertaken. The work is originated during careful observation of an undergraduate experiment-Tollens' test-where silver mirror film deposition takes place on the walls of borosilicate glass test tube. When the same reaction was carried out in polypropylene (plastic-Eppendorf) tube, we observed aggregation of Ag leading to floating Ag-particles but not silver film deposition. This prompted us to carry out challenging cross-coupling reaction by ONLY changing the surface of the reaction flask from glass to plastic to silicones. To our surprise, we observed good selective oxidative homo-coupling on Teflon surface while cross-coupling in Eppendorf vial. Thus, we propose that the formation of biphenyl is driven by the macroscopic growth of Ag into [Ag-particle] orchestrated by Ag…Ag cohesive interaction. To validate results, experiments were also performed on gram scale. More importantly, oxidation of β-naphthol carried out in quartz (chiral) tube which yielded slight enantioselective excess of BINOL. Details are discussed.Khushboo Bhanderi, Prasanna S Ghalsasi, Katsuya Inoue
1408 related Products with: Nonconventional driving force for selective oxidative C-C coupling reaction due to concurrent and curious formation of Ag.
96 Tests1 mg1 mg0.1 ml25 g96 tests10 mg100 reactions
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#33452066 2021/01/15
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Deep vein thrombosis with pulmonary thromboembolism in a case of severe COVID-19 pneumonia.
A 53-year-old man with diabetes came to the emergency department with fever and dry cough for 5 days, swelling of the left leg for 2 days, shortness of breath and chest pain for 1 hour. He had raised temperature, tachycardia, tachypnoea, reduced oxygen saturation and swollen tender left leg on examination. The frontal chest radiograph showed bilateral ground-glass opacities; he tested positive for COVID-19 with elevated D-dimer. The colour Doppler examination of the left leg revealed acute deep vein thrombosis (DVT) of the common femoral and the popliteal veins. The chest CT showed bilateral diffuse ground-glass opacities predominantly involving peripheral zones and the lower lobes. The CTPA revealed left pulmonary thromboembolism (PTE), treated with low-molecular-weight heparin. COVID-19 predominantly affects the respiratory system. DVT and PTE are common in COVID-19 but lethal. They should be diagnosed early by clinical and radiological examinations and treated promptly with anticoagulants.Sujata Devi, Sudipta Mohakud, Nilanjan Kar, Divya Muthuvel
1670 related Products with: Deep vein thrombosis with pulmonary thromboembolism in a case of severe COVID-19 pneumonia.
100 μg
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#33450978 2021/01/13
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Thermoplastic Polymers with Nanosilver Addition-Microstructural, Surface and Mechanical Evaluation during a 36-Month Deionized Water Incubation Period.
Three types of thermoplastic polymers, acrylonitrile butadiene styrene (ABS), polymethyl methacrylate acrylic (PMMA) and high-density polyethylene (HDPE), were enriched with silver nanoparticles (AgNPs) of 0.5 wt.% and 1.0 wt.%, respectively. The polymers and the composites were manufactured via injection molding. Regarding the potential of these polymers as matrices for long-term use as biomaterials, the aim of this study was to examine their stability in the in vitro conditions during a three-year incubation period in deionized water. In this work, microstructural observations were performed, and mechanical properties were assessed. Surface parameters, such as roughness and contact angle, were comprehensively investigated. The microstructural evaluation showed that the silver additive was homogeneously dispersed in all the examined matrices. The 36-month immersion period indicated no microstructural changes and proved the composites' stability. The mechanical tests confirmed that the composites retained comparable mechanical properties after the silver incorporation. The Young's modulus and tensile strength increased during long-term incubation. The addition of silver nanoparticles did not alter the composites' roughness. The contact angle increased with the rising AgNP content. It was also shown that the materials' roughness increased with the incubation time, especially for the ABS- and HDPE-based materials. The water environment conditions improved the wettability of the tested materials. However, the silver nanoparticles' content resulted in the contact angle decreasing during incubation. The conducted studies confirmed that the mechanical properties of all the polymers and composites did not deteriorate; thus, the materials may be considered stable and applicable for long-term working periods in aqueous environments.Magdalena Ziąbka, Michał Dziadek
2039 related Products with: Thermoplastic Polymers with Nanosilver Addition-Microstructural, Surface and Mechanical Evaluation during a 36-Month Deionized Water Incubation Period.
100ug0,1 ML25 mg40 LB100 mg 20 L 100ug 25 MG1mg10 mg200
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#33450830 2021/01/13
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1,1'-Bis(diphenylphosphino)ferrocene Platinum(II) Complexes as a Route to Functionalized Multiporphyrin Systems.
In this study, the cationic complex [PtMe(MeSO)(dppf)]CFSO (PtFc) (dppf = 1,1'-bis(diphenylphosphino)ferrocene) was exploited as a precursor to functionalize the multi-chromophoric system (pyridyl-porphyrinato)benzene (1). The final adduct [PtFc]-1, containing eighteen platinum(II) organometallic [PtMe(dppf)] fragments, was prepared and characterized through UV/Vis absorption, P{H}-NMR spectroscopy, and fluorescence emission. UV/vis and fluorescence titrations confirmed the coordination between the platinum(II) center and all the pyridyl moieties of the peripheral substituent groups of the porphyrin. The drop casting of diluted dichloromethane solution of [PtFc]-1 onto a glass surface afford micrometer-sized emissive porphyrin rings.Maria Rosaria Plutino, Andrea Romeo, Maria Angela Castriciano, Luigi Monsù Scolaro
1834 related Products with: 1,1'-Bis(diphenylphosphino)ferrocene Platinum(II) Complexes as a Route to Functionalized Multiporphyrin Systems.
1 kit(96 Wells)100 assays1 kit(96 Wells)1 kit(96 Wells)96430 tests1 kit(96 Wells)1 kit(96 Wells)100 assays
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#33450824 2021/01/13
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Dielectric Thermal Smart Glass Based on Tunable Helical Polymer-Based Superstructure for Biosensor with Antibacterial Property.
A dielectric thermal smart glass (DTSG) based on the dielectric heating optical (DHO) effect in tunable helical polymer-based superstructures-cholesteric liquid crystals (CLCs)-was exhibited in this study. Field-induced dielectric heating can strongly affect the orientation of liquid crystals and change its optical properties. The purpose of this research focuses on dual-frequency CLC materials characterized by their specific properties on dielectric relaxation and demonstrates their potential for antibacterial biosensor applications. The developed DTSG is driven by voltages with modulated frequencies. The principal of DTSG in transparent states are a planar (P) state and a heated planar (HP) state reflecting infrared light, operated with the voltage at low and high frequencies, respectively. The scattering states are a focal conic (FC) state and a heated FC (HFC) state, with an applied frequency near the crossover frequency. The biomolecule detection of the antibacterial property was also demonstrated. The detection limitation of the DTSG biosensor was found to be about 0.5 µg/mL. The DTSG material has many potential industrial applications, such as in buildings, photonic devices, and biosensor applications.Haw-Ming Huang, Fu-Lun Chen, Ping-Yuan Lin, Yu-Cheng Hsiao