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Schwimmer, Yair, Nurit Beyth, Diana Ram, Eitan Mijiritsky, and Esti Davidovich. "Laser Tooth Preparation for Pit and Fissure Sealing." International Journal of Environmental Research and Public Health 17, no. 21 (October 26, 2020): 7813. http://dx.doi.org/10.3390/ijerph17217813.
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Objectives: Various approaches are available for pit and fissure sealing, including: the use of sealants, with or without mechanical preparation; the use of etching, with or without bonding; and the use of lasers as an alternative to mechanical preparation. The objective of this study is to evaluate pit and fissure sealing by comparing the retention and microleakage of sealants, between mechanical and Er:Yag laser enamel preparation. Methods: Sixty extracted sound third molars are classified into six groups: A, bur mechanical preparation and sealant application; B, bur mechanical preparation, etching and sealant; C, bur mechanical preparation, etching, bonding and sealant; D, laser mechanical preparation and sealant; E, laser mechanical preparation, etching and sealant application; F, laser mechanical preparation, etching, bonding, and sealant. Statistical analysis methods include Fisher’s exact test, a general linear model for one-way analysis of variance (ANOVA) of multiple comparisons, and Bonferroni multiple comparison tests. Results: All the groups showed dye microleakage beneath the sealants. Less microleakage was observed for those that used bur rather than laser, 41 versus 44 specimens, respectively. The number of specimens without microleakage decreased as follows: group E (24), group A (18), groups B and F (17), group C (14), and group D (5). Retention was 100% in all groups except group D. Conclusion: Mechanical preparation increases retention of sealants, especially when etching material is used; additionally, bonding can help the retention. The best technique is mechanical preparation via laser and subsequent use of etching, without bonding prior to application of the dental sealant.
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Lugscheider, E., P. Jakiel, V. Messerschmidt, and G. Beckschulte. "Subsequent sealing of thermally sprayed coatings to increase corrosion resistance." Surface Engineering 10, no. 1 (January 1994): 46–51. http://dx.doi.org/10.1179/sur.1994.10.1.46.
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Cao, Qingchen, Guofei Sun, Xing Wang, Fei Yang, Licheng Zhang, and Decheng Wu. "Bioinspired self-degradable hydrogels towards wound sealing." Biomaterials Science 9, no. 10 (2021): 3645–49. http://dx.doi.org/10.1039/d1bm00420d.
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A self-degradable hydrogel was developed as a medical adhesive for skin wounds. The rapid gelation and self-degradation of the hydrogel were achieved via the Michael addition and subsequent hydrolysis of the addition product.
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Chen, S. C., and K. Vafai. "An Experimental Investigation of Free Surface Transport, Bifurcation, and Adhesion Phenomena as Related to a Hollow Glass Ampule and a Metallic Conductor." Journal of Heat Transfer 114, no. 3 (August 1, 1992): 743–51. http://dx.doi.org/10.1115/1.2911343.
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An experimental investigation of free surface transport and subsequent bifurcation and adhesion for a hollow glass ampule is presented in this work. Detailed phenomenological features of the process are displayed and discussed. This experimental investigation, which is generic in nature, provides the much needed phenomenological information on free surface transport, glass processing as related to optical fiber production, and glass-to-metal sealing processes. Detailed images of the actual sealing process provide valuable information on identifying and isolating the key regimes in the process and mapping out process defects, and contribute to a basic understanding of the physical mechanisms involved in the sealing process.
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Sundfeld, Renato Herman, Theodore P. Croll, Silvio José Mauro, André Luiz Fraga Briso, Rodrigo Sversut de Alexandre, and Maria Lúcia Marçal Mazza Sundefeld. "Longitudinal photographic observation of the occurrence of bubbles in pit and fissure sealants." Journal of Applied Oral Science 14, no. 1 (January 2006): 27–32. http://dx.doi.org/10.1590/s1678-77572006000100006.
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The purpose of this study was to employ photographic evaluation to observe the presence or absence of bubbles in pit and fissure sealants Concise and Prisma Shield, at 7 days, 18 months, 36 months and 11 years after accomplishment of treatment. METHODS: A hematoxylin-based staining solution was applied to the occlusal surface at the study periods, which allowed assessment of the sealing material on the surface. All occlusal surfaces were photographed and the photographs corresponding to each period were subjected to photographic evaluation. RESULTS: There was statistically significant difference only at 18 months, with a significantly higher number of specimens with bubbles for the Prisma Shield sealant compared to the Concise, whereas the groups were similar at all other study periods. On the other hand, separate analysis of subsequent periods of the sealants did not reveal any significant difference. CONCLUSIONS: According to the results of the present longitudinal investigation, it may be concluded that the sealing materials showed that bubbles came into and went out with time. However, this fact did not interfere with its clinical purpose, provided the remaining material covers the expected region of pits and fissures.
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Abdulzhalilov, M. K., A. M. Abdulzhalilov, and M. R. Imanaliyev. "An Effective Way to Prevent Depressurization of Carboxyperitoneum and Extraperitoneal Insufflation During Simultaneous Laparoscopic Interventions." Russian Sklifosovsky Journal "Emergency Medical Care" 9, no. 1 (October 20, 2020): 21–26. http://dx.doi.org/10.23934/2223-9022-2020-1-21-26.
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ABSTRACT. Laparoscopic simultaneous surgery (LSS) in patients with multisystem abdominal organs lesion is accompanied by ports’ re-installation for subsequent surgical intervention. Preserved trocar wounds (PTWs) pass carbon dioxide from the abdominal cavity, increasing its consumption and causing depressurization of the carboxyperitoneum. The incidence of extraperitoneal insufflation during laparoscopy varies from 0.43 to 2% (I.V. Vartanova et al., 2016). The presence of many methods of sealing PTWs indicates their inefficiency.AIM OF STUDY. To develop an easy-to-use, more reliable and effective way of sealing PTWs.RESULTS. As a result, a comparative evaluation of known methods of sealing PTWs, we have developed an easy-to-use, more reliable and effective way of sealing PTWs «Method for sealing punctures of the abdominal wall after removing the trocar during a laparoscopic surgery» (patent RF for the invention № 2621121).DISCUSSION. This method was performed in 55 patients, in all cases it provided reliable PTWs tightness, allowed maintaining stable carboxyperitoneum during laparoscopic interventions, without increasing carbon dioxide consumption, which reduced the cost of LSS and prevented the development of both intraand postoperative complications. The uniqueness of this method is that PTW is sealed from the side of the abdominal cavity, preventing carbon dioxide from penetrating into either the preperitoneal or subcutaneous tissue.CONCLUSION. An increase in the number of patients with combined surgical pathology necessitates the use of the developed method for sealing punctures when moving trocars and neutralizing sub- and postoperative complications. In addition, this method allows to reduce carbon dioxide consumption.
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Tomczak, Kamil, Jacek Jakubowski, and Łukasz Kotwica. "Self-Sealing Process Evaluation Method Using Ultrasound Technique in Cement Composites with Mineral Additives." Materials 13, no. 15 (July 27, 2020): 3336. http://dx.doi.org/10.3390/ma13153336.
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The self-sealing process, associated with chemical and microstructural changes inside damaged cement-based composites, leads to the recovery of the original material integrity. Assessing the magnitude of internal changes in samples using non-destructive techniques to capture only the self-sealing effects is difficult. The challenge is evaluating the differences between subsequent observations in time and between samples with different properties. This paper proposes a new approach to the use of an ultrasonic technique for self-sealing investigation. The method allows the quantification of material changes strictly related to self-sealing processes, excluding changes caused by the naturally progressing hydration of binders. The applied ultrasonic pulse velocity (UPV) data processing procedure allows the investigation of material changes inside and near the cracks, the effects of stimulating the self-sealing of cement composites with mineral additives, and the assessment of changes over time. An important aspect of the method is the sample preparation procedure and testing conditions that reduce the impact of moisture content on the UPV measurements. New parameters allowing the quantitative characterization of the self-sealing process are proposed. The method was evaluated using cement mortars modified with siliceous fly ash with induced cracks 0 to 750 µm wide, which were then cured in water for 152 days. The maximum degree of effective crack filling as a result of autogenous self-sealing in the tested mortars was determined to range from 33% to 57%. Observations of the microstructure of the crack surface confirmed that apart from the volume of the newly formed products, the density of these products may have a key impact on the ultrasonic measurements of the self-sealing performance. The studies were supplemented by the examination of the compression strength of mortars, mortar sample scanning and computer image processing, and observations using an optical microscope and scanning electron microscope with energy dispersive spectroscopy.
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Kolodkina, V. I., and Armenak Valer'evich Arutyunov. "MORPHOLOGICAL STRUCTURE OF ENAMY, DENTINE OF TEETH AND COMPOSITE FORMING MATERIALS IN VITRO." Russian Journal of Dentistry 22, no. 4 (August 15, 2018): 176–79. http://dx.doi.org/10.18821/1728-2802-2018-22-4-176-179.
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Solving the problem of increasing the effectiveness of treatment of diseases of hard tooth tissues is an urgent task not only for the dental community of doctors, but for dentistry in general. Provision of edge tightness and high adhesive bond of copolytic material with enamel and dentin to prevent the occurrence of micro-permeability of restoration for toxic agents and subsequent inflammation of pulp is one of the most urgent problems of therapeutic dentistry. Universal microhybrid composites used for sealing all groups of teeth were created in the last century, however, a number of important problems remain unresolved until now. The purpose of this study was to assess the morphological structure of the enamel and dentin of the teeth before and after using restorative sealing materials with and without sealant coating. The data obtained as a result of the research allows us to estimate from the scientific point of view the changes in the micro-morphological structure of enamel and dentin at the points of contact with the composite material, accompanied by a decrease in the microhardness of the dentine on the background of unsatisfactory oral hygiene, increased consumption of soft and carbohydrate-rich foods, salivary capacity, as well as direct exposure of microorganisms and products of their vital activity to hard dental tissues.
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Pereira, Marlon Correa, Roisin O’Riordan, and Carly Stevens. "Urban soil microbial community and microbial-related carbon storage are severely limited by sealing." Journal of Soils and Sediments 21, no. 3 (January 29, 2021): 1455–65. http://dx.doi.org/10.1007/s11368-021-02881-7.
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Abstract Purpose Urbanisation causes changes in land use, from natural or rural to urban, leading to the sealing of soil and the replacement of vegetation by buildings, roads and pavements. The sealing process impacts soil properties and services and can lead to negative consequences for microbial attributes and processes in soil. At present, information about the microbial community following soil sealing is limited. As such, we investigated how changes in soil physical and chemical properties caused by sealing affect the soil microbial community and soil ecosystem services. Material and methods Soils were sampled beneath impervious pavements (sealed) and from adjacent pervious greenspace areas (unsealed). Soil properties (total C, total N, C:N ratio and water content) and microbial attributes (microbial biomass C, N-mineralisation and phospholipid fatty acids—PLFA) were measured and correlated. Results and discussion A reduction of total C, total N, and water content were observed in sealed soil, whilst the C:N ratio increased. Sealed soil also presented a reduction in microbial attributes, with low N-mineralisation revealing suppressed microbial activity. PLFA data presented positive correlations with total C, total N and water content, suggesting that the microbial community may be reduced in sealed soil as a response to soil properties. Furthermore, fungal:bacterial and gram-positive:gram-negative bacterial ratios were lower in sealed soil indicating degradation in C sequestration and a consequential effect on C storage. Conclusions Sealing causes notable changes in soil properties leading to subsequent impacts upon the microbial community and the reduction of microbial activity and soil C storage potential.
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Ivanovs, Semjons, and Eduards Matisans. "ECOLOGICALLY SAFE TECHNOLOGIES OF GRASS FEED PRODUCTION." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 1 (June 20, 2001): 36. http://dx.doi.org/10.17770/etr2001vol1.1969.
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The aim of the research was to find out the possibilities for reducing the prime cost of environmentally safe technologies fo the preparation of herbaceous fodder by improving technical means. During the recent years, on major individual and co? operative farms there is being introduced a perspective roll technology of processing wilted green grass with subsequent sealing of rolls m a flexible film. The advantages of the green grass processing technology with subsequent sealing of rolls in a flexible film are: - environmental safety o f the technology (exclusion of pollution with silo saps, absence o f odour nuisance, absence o f compounds m the feed that are detrimental to animals and formed during the common siloing, its low acidity); - considerably lower dependence of forage processing on weather conditions, complete mechanisation of engineering processes; - the forage can be processed in small quantities, and for its storage no specialised containers are needed, which is a valuable feature for small farms; - increased nutritive value and good gustative qualities providing a possibility of essential raising the yields of milk and its quality (retention of all nutrients and vitamins), insignificant losses of nutrients during the harvesting and storage period (not more than 10-15%).
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Speck, Olga, Mark Schlechtendahl, Florian Borm, Tim Kampowski, and Thomas Speck. "Humidity-dependent wound sealing in succulent leaves of Delosperma cooperi – An adaptation to seasonal drought stress." Beilstein Journal of Nanotechnology 9 (January 16, 2018): 175–86. http://dx.doi.org/10.3762/bjnano.9.20.
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During evolution, plants evolved various reactions to wounding. Fast wound sealing and subsequent healing represent a selective advantage of particular importance for plants growing in arid habitats. An effective self-sealing function by internal deformation has been found in the succulent leaves of Delosperma cooperi. After a transversal incision, the entire leaf bends until the wound is closed. Our results indicate that the underlying sealing principle is a combination of hydraulic shrinking and swelling as the main driving forces and growth-induced mechanical pre-stresses in the tissues. Hydraulic effects were measured in terms of the relative bending angle over 55 minutes under various humidity conditions. The higher the relative air humidity, the lower the bending angle. Negative bending angles were found when a droplet of liquid water was applied to the wound. The statistical analysis revealed highly significant differences of the single main effects such as “humidity conditions in the wound region” and “time after wounding” and their interaction effect. The centripetal arrangement of five tissue layers with various thicknesses and significantly different mechanical properties might play an additional role with regard to mechanically driven effects. Injury disturbs the mechanical equilibrium, with pre-stresses leading to internal deformation until a new equilibrium is reached. In the context of self-sealing by internal deformation, the highly flexible wide-band tracheids, which form a net of vascular bundles, are regarded as paedomorphic tracheids, which are specialised to prevent cell collapse under drought stress and allow for building growth-induced mechanical pre-stresses.
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Bui, Duc Thu, and Sen Yang. "Optimization of MAO Process Parameters and Effect of Subsequent Sealing Treatment on Corrosion Resistance of Aluminum Alloy." Materials Science Forum 898 (June 2017): 1438–46. http://dx.doi.org/10.4028/www.scientific.net/msf.898.1438.
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Micro-arc oxidation (MAO) coatings were obtained on the substrate of AlSi12Cu aluminum alloy in Na2SiO3 electrolyte. Then, the MAO coatings were sealed in stearic acid and sodium silicate solution, respectively. Experiments were conducted by varying current density, oxidation time and the frequency. L9 (33) of orthogonal experiments were chosen to optimize the processing parameters in the process of MAO technique. Through the above orthogonal experiments, the optimal process conditions were determined: the current density of 30 A/dm2, the oxidation time of 20 min, and the frequency of 600 Hz. The results showed that the MAO coating consisted of α-Al2O3 and γ-Al2O3. There were lots of pores and micro-cracks on the coating surface. The corrosion current of the aluminum alloy after MAO combination with stearic acid sealing treatments was significantly reduced, decreased 100 times more than the substrate and the corrosion potential increased 272 mV, signifying enhanced corrosion resistance. The corrosion rate of the aluminum alloy after MAO treatment in the washing powder solution decreased 25 times more than that of the substrate.
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Ogata, Sho, Hideaki Yasuhara, Naoki Kinoshita, and Kiyoshi Kishida. "Coupled thermal–hydraulic–mechanical–chemical modeling for permeability evolution of rocks through fracture generation and subsequent sealing." Computational Geosciences 24, no. 5 (April 6, 2020): 1845–64. http://dx.doi.org/10.1007/s10596-020-09948-3.
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Lindenmann, Joerg, Alfred Maier, Nicole Fink-Neuboeck, and Freyja Smolle-Juettner. "Fatal aortic hemorrhage after over-the-scope clipping and subsequent esophageal stenting for sealing of iatrogenic esophageal perforation." Endoscopy 47, S 01 (June 22, 2015): E280—E281. http://dx.doi.org/10.1055/s-0034-1391954.
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Niemann, H., J. H. Pryor, and K. R. Bondioli. "Effects of slitting the zona pellucida and its subsequent sealing on freeze-thaw survival of Day 7 bovine embryos." Theriogenology 28, no. 5 (November 1987): 675–81. http://dx.doi.org/10.1016/0093-691x(87)90284-6.
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Keller, Dennis, Georg Jacobs, and Stephan Neumann. "Development of a Low-Friction Radial Shaft Seal: Using CFD Simulations to Optimise the Microstructured Sealing Lip." Lubricants 8, no. 4 (April 4, 2020): 41. http://dx.doi.org/10.3390/lubricants8040041.
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The sealing of shaft interfaces in machine housings against oil leakage is commonly realized by radial shaft seals, hence they are used millions of times in technical systems. However, with increasing speed they cause significant friction losses, which reduce the efficiency of the system significantly. In addition, the prevailing trend towards higher speed levels in electrified drive trains is already pushing sealing technology to its performance limits. Therefore, friction reduction offers a chance to extend the current performance limits and increase efficiency within existing applications. In this paper, a methodology for friction reduction is proposed, which is based on microstructuring and surface treatment of the seal sliding surface. Since experimental structural design is linked to high costs and time, a simulation-based method is proposed. Computational Fluid Dynamics (CFD) simulations are performed to analyze the influence of the structural geometry on local fluid flow. It is shown that for increasing sliding speeds, the analysis and the subsequent optimization of deterministic microstructures require the numerical solution of the complete Navier–Stokes equation in order to take inertial effects into account. Based on these results, an optimal geometric shape for the microstructure is found depending on the operating conditions.
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Yafawi, Asma, Richard G. McWilliams, Robert K. Fisher, Andrew England, Maria Karouki, and Francesco Torella. "Stent Frame Movement Following Endovascular Aneurysm Sealing in the Abdominal Aorta." Journal of Endovascular Therapy 26, no. 1 (November 28, 2018): 54–61. http://dx.doi.org/10.1177/1526602818814548.
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Purpose: To investigate the incidence and extent of stent frame movement after endovascular aneurysm sealing (EVAS) in the abdominal aorta and its relationships to aneurysm growth and the instructions for use (IFU) of the Nellix endograft. Methods: A retrospective single-center study was conducted to review the clinical data and computed tomography (CT) images of 75 patients (mean age 76±7.6 years; 57 men) who underwent infrarenal EVAS and had a minimum 1-year follow-up. The first postoperative CT scan at 1 month and the subsequent scans were used to measure the distances between the proximal end of the stent frames and a reference visceral vessel using a previously validated technique. Device migration was based on the Society of Vascular Surgery definition of >10-mm downward movement of either Nellix stent frame in the proximal landing zone; a more conservative proximal displacement measure (downward movement ⩾4 mm) was also recorded. Patients were categorized according to adherence to the old (2013) or new (2016) Nellix IFU. Aneurysm diameter was measured for each scan; a change ⩾5 mm was deemed indicative of aneurysm growth. Results: Over a median follow-up of 24 months (range 12–48), proximal displacement ⩾4 mm occurred in 42 (56%) patients and migration >10 mm in 16 (21%), with similar incidences in the right and left stent frames. Proximal displacement was significantly more frequent among patients whose anatomy did not conform to any IFU (p=0.025). Presence of aneurysm growth ⩾5 mm was observed in 14 (19%) patients and was significantly associated with proximal displacement ⩾4 mm (p=0.03). Conclusion: Infrarenal EVAS may be complicated by proximal displacement and migration, particularly when performed outside the IFU. The definition of migration used for endovascular aneurysm repair may be inappropriate for EVAS; a new consensus on definition and measurement technique is necessary.
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Nogueira Kiewiet, M., C. Lima, A. Giwelli, C. Delle Piane, V. Lemiale, L. Esteban, F. Falcao, et al. "An experimental and numerical investigation on the hydromechanical behaviour of carbonate fault zones upon reactivation: the impact of carbonate mud sealing layers and overall research outcomes." Geological Society, London, Special Publications 496, no. 1 (September 13, 2019): 39–73. http://dx.doi.org/10.1144/sp496-2018-153.
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AbstractTo contribute to the understanding of the impacts of fault reactivation induced by reservoir exploitation, we describe the final series of laboratory experiments, numerical simulations and microstructural analysis conducted during the ‘Fault Reactivation in Carbonates’ research project. In the project, the structure and hydromechanical properties of carbonate-hosted fault zones were investigated. For the analyses here reported, faults were artificially generated by direct shearing composite blocks made of layers of reservoir analogue rocks (outcrop travertine or synthetic grainstone) intercalated with one layer of a sealing analogue rock (synthetic carbonate mudstone). Post-direct shearing, cylindrical plugs containing the fault zone and parts of intact rock were cored out from the blocks and tested in a triaxial test rig, simulating fault reactivation. Varied stress paths and pore-pressure conditions representative of fluid depletion and injection were considered. In parallel, two-dimensional mechanical models representative of the direct shear experiments were developed using smoothed particle hydrodynamics (SPH). We observed a continuous reduction in fault transmissibility during direct shearing, followed by a permeability reduction of 50–80% with increasing mean effective stress in the subsequent fault reactivation tests. Experimental fault zone geometries produced during direct shear were broadly reproduced by the two-dimensional modelling approach. We also detected that the inclusion of the carbonate mud sealing rock into the fault zone caused greater compaction of the fault materials when compared to experiments conducted without carbonate mud layers. We conclude that with fault displacement, increasing incorporation of carbonate mud sealing material into the fault zone and the concomitant development of gouge results in the continuous reduction of fault transmissibility/permeability. This occurs in the two very different limestone host-rock types and for all the stress configurations investigated. Discussions on these results and also on the outcomes of the research project as a whole are presented in the paper.
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Chellaiah, Meenakshi A. "L-Plastin Phosphorylation: Possible Regulation by a TNFR1 Signaling Cascade in Osteoclasts." Cells 10, no. 9 (September 15, 2021): 2432. http://dx.doi.org/10.3390/cells10092432.
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Tumor necrosis factor-alpha (TNF-α) signaling regulates phosphorylation of L-plastin, which is involved in forming the nascent sealing zone, a precursor zone for the matured sealing ring. This study aimed to illustrate the molecular mechanisms of L-plastin phosphorylation and the subsequent formation of the nascent sealing zone in osteoclasts treated with TNF-α. Here, we report that anti-TNF-receptor 1, inhibitors of signaling proteins (Src, PI3-K, Rho, and Rho-kinase), and siRNA of TRAF-6 attenuated the phosphorylation of LPL and filamentous actin content significantly in the presence of TNF-α. An inhibitor of integrin αvβ3, PKC, or PKA did not inhibit TNF-α-induced L-plastin phosphorylation. Inhibitors of Src and PI3-K and not Rho or Rho-kinase reduced tyrosine phosphorylation of TRAF-6, suggesting that Src and PI3-K regulate TRAF-6 phosphorylation, and Rho and Rho-kinase are downstream of TRAF-6 regulation. Osteoclasts expressing constitutively active or kinase-defective Src proteins were used to determine the role of Src on L-plastin phosphorylation; similarly, the effect of Rho was confirmed by transducing TAT-fused constitutively active (V14) or dominant-negative (N19) Rho proteins into osteoclasts. Pull-down analysis with glutathione S-transferase-fused SH2 and SH3 domains of Src and PI3-K demonstrated coprecipitation of L-plastin and TRAF-6 with the SH3 and SH2 domains of the PI3-K and Src proteins. However, the actual order of the interaction of proteins requires further elucidation; a comprehensive screening should corroborate the initial findings of protein interactions via the SH2/SH3 domains. Ultimately, inhibition of the interaction of proteins with SH2/SH3 could reduce L-plastin phosphorylation and affect NSZ formation and bone resorption in conditions that display osteoclast activation and bone loss.
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Iannella, Giannicola, Alessandra Manno, Emanuela Pasqualitto, Andrea Ciofalo, Diletta Angeletti, Benedetta Pasquariello, and Giuseppe Magliulo. "Massive Cerebrospinal Fluid Leak of the Temporal Bone." Case Reports in Otolaryngology 2016 (2016): 1–4. http://dx.doi.org/10.1155/2016/7521798.
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Cerebrospinal fluid (CSF) leakage of the temporal bone region is defined as abnormal communications between the subarachnoidal space and the air-containing spaces of the temporal bone. CSF leak remains one of the most frequent complications after VS surgery. Radiotherapy is considered a predisposing factor for development of temporal bone CSF leak because it may impair dural repair mechanisms, thus causing inadequate dural sealing. The authors describe the case of a 47-year-old man with a massive effusion of CSF which extended from the posterior and lateral skull base to the first cervical vertebrae; this complication appeared after a partial enucleation of a vestibular schwannoma (VS) with subsequent radiation treatment and second operation with total VS resection.
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Crimi, Gabriele, Davide Bartolini, Sandro Bellotti, Alessandro Iannone, and Paolo Rubartelli. "Percutaneous Management of a Coronary Bifurcation Aneurysm with Mesh-Covered Stents and the Simultaneous Kissing Stent Technique." Texas Heart Institute Journal 42, no. 4 (August 1, 2015): 397–99. http://dx.doi.org/10.14503/thij-13-4020.
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A 63-year-old man was admitted with a clinical diagnosis of acute coronary syndrome (non-ST-segment elevation), characterized by regional hypokinesia of the left ventricular posterior and lateral walls and by positive cardiac biomarkers. The coronary angiogram showed a 12.5-mm-diameter aneurysm with a mural thrombus and possible distal embolism to the bifurcation of the left circumflex coronary artery and the 2nd marginal branch. The aneurysm was managed percutaneously by implanting 2 mesh-covered stents in accordance with the “simultaneous kissing stent” technique. Follow-up angiography and optical coherence tomography at 5 postprocedural months documented complete sealing of the aneurysm and diffuse in-stent restenosis. No sign of ischemia occurred during the subsequent follow-up.
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Neymeyer, J., A. Y. Weintraub, and A. Weichert. "OC09.02: Detection of ureter fistulas using the “pumping probe technique” and subsequent treatment with a covered self-expanding and sealing ureteral stent." Ultrasound in Obstetrics & Gynecology 46 (September 2015): 19. http://dx.doi.org/10.1002/uog.15007.
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Travis, Karl P., and Fergus G. F. Gibb. "Deep Borehole Disposal Research: What have we learned from numerical modeling and what can we learn?" MRS Proceedings 1744 (2015): 193–203. http://dx.doi.org/10.1557/opl.2015.313.
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ABSTRACTGeological disposal of HLW and spent nuclear fuel (SNF) in very deep boreholes is a concept whose time has come. The alternative – disposal in a mined, engineered repository is beset with difficulties not least of which are the constraints placed upon the engineered barriers by the high thermal loading. The deep borehole concept offers a potentially safer, faster and more cost-effective solution. Despite this, international interest has been slow to materialize, largely due to perceived problems with retrievability and uncertainty about the ability to drill accurate vertical holes with diameters greater than 0.5 m to a depth of 4-5 km. The closure of Yucca Mountain and the subsequent recommendations of the Blue Ribbon Commission have lead to a renewed interest in deep borehole disposal (DBD) and the US DoE has commissioned Sandia National Labs, working with industrial and academic partners (including the University of Sheffield), to undertake a program of R&D leading to a demonstration borehole being drilled somewhere in the continental USA by 2016.In this paper, we focus on some of the key safety and engineering features of DBD including methods of sealing the boreholes, sealing and support matrices for the waste packages. Numerical modeling has, and continues to play, a significant role in expanding and validating the DBD concept. We report on progress in the use of modeling in the above contexts, paying particular attention to constraints on the engineering materials resulting from high heat loading.
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Burgess, Edwin R., and B. H. King. "A Field-Relevant Concentration of the Insecticide Imidacloprid Affects Grooming, Locomotion, and Longevity in the Biological Control Agent Spalangia endius (Hymenoptera: Pteromalidae)." Environmental Entomology 49, no. 3 (April 22, 2020): 566–71. http://dx.doi.org/10.1093/ee/nvaa040.
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Abstract Foreign materials like insecticides may increase grooming in insects; and generally, grooming may be expected to reduce effects of insecticides, but this may not be the case when grooming involves the mouth and hence a risk of ingestion. To examine this, female Spalangia endius, a wasp that parasitizes filth fly pupae, were exposed to a surface coated with a low concentration of imidacloprid or not. Their mouthparts were sealed or not to determine whether sealing is a useful method for examining effects of mouth grooming. Wasps mouth-groomed more frequently while exposed to imidacloprid than when not. However, imidacloprid did not increase the number of times that a wasp groomed the rest of her body, and this was true regardless of whether or not her mouthparts were sealed. While exposed to imidacloprid, wasps spent less time locomoting only if their mouthparts were not sealed. Having been exposed to imidacloprid also decreased subsequent longevity, from 9 to 7 d. These effects of imidacloprid on grooming, locomotion, and longevity occurred despite exposure being for just 5 min and to only 2% of the amount that will be present in an area immediately after house fly baits are scattered at their recommended coverage. This is such a low amount that, with 48 h of constant exposure, mortality of these wasps is only 10%. Having mouthparts sealed decreased locomotion and longevity regardless of exposure to imidacloprid. Thus, sealing mouthparts is not useful for measuring effects of mouth grooming.
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Aymonier, Agnès, and Eric Papon. "Designing Soft Reactive Adhesives by Controlling Polymer Chemistry." MRS Bulletin 28, no. 6 (June 2003): 424–27. http://dx.doi.org/10.1557/mrs2003.122.
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AbstractSoft reactive adhesives (SRAs) are polymer-based materials (e.g., polyurethanes, polysiloxanes, polydienes) designed to be further vulcanized or slightly cross-linked through external activation (heat, moisture, oxygen, UV–visible irradiation, etc.), either at the time of their application or within a subsequent predefined period. They are used mainly as mastics, or sealing compounds, in a wide range of industrial and commercial fields such as construction, footwear, and the automotive industry. Generally deposited as thick films, SRAs behave as structural adhesives; their low elastic moduli accommodate large strains between the bonded parts without incurring permanent damage. Other outstanding attributes of SRAs are their resistance to solvents, their ability to withstand aggressive environments, and their ease of use. This article discusses examples of SRAs and, more specifically, shows how the cross-linking chemistry, mainly through step-growth polymerization, provides their primary advantages.
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Gontarski, Igor Alessando, Marcos Cezar Pomini, Sthelen Nayara Cenci, Giovana Mongruel Gomes, Lidia Olga Bach Pinheiro, and Adriana Postiglione Buhrer Samra. "Two-year clinical performance of cast post and core self-adhesive cementation." RSBO 1, no. 4 (July 5, 2018): 229. http://dx.doi.org/10.21726/rsbo.v1i4.549.
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Introduction and Objective: Endodontically treated teeth commonly present extensive tissue loss, requiring the use intraradicular posts, which provide retention for a coronal rehabilitation. Cast post and cores (CPCs) have been traditionally used in cases of marked tooth tissue loss. Case report: This case report describes two cast post and cores and subsequent rehabilitation by metal ceramic crowns. The patient was followed-up at intervals of 12 and 24 months after the rehabilitation. The posts were cemented within the root canal with self-adhesive resin cement, in a way that guarantees a perfect sealing of the root and remains stable in the oral environment. Conclusion: Self-adhesive cements are a one-step material capable of providing additional chemical adhesion to the metal, creating a monoblock, quality not found in conventional resin cements, where the adhesion occurs only in the dentin-cement interface.
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Huebner, Erwin, Rene Harrison, and Karen Yeow. "A new feeding technique for experimental and routine culturing of the insect Rhodnius prolixus." Canadian Journal of Zoology 72, no. 12 (December 1, 1994): 2244–47. http://dx.doi.org/10.1139/z94-299.
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We report a method for artificially feeding the reduviid insect Rhodnius prolixus that utilizes heparinized rabbit blood enclosed in an artificial-membrane envelope. Envelopes of Parafilm M® or Nescofilm® are made by heat sealing two pieces, one of which is stretched first, on three sides. Blood is then put into the envelope, the air expelled, and the fourth side sealed with a bag sealer. The blood-filled envelopes are then placed on a standard slide warmer set at 37 °C and insects in jars with wire-mesh tops are allowed to feed. Normal gorging and subsequent molting of instars were attained. Adult females show normal fecundity (the E value was 0.19 for mated females) and egg hatchability was also normal. The method is simple, cost effective, and easy to implement. It is especially suited for experimental feedings.
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Igor Alessando Gontarski, Marcos Cezar Pomini, Sthelen Nayara Cenci, Giovana Mongruel Gomes, Lidia Olga Bach Pinheiro, and Adriana Postiglione Buhrer Samra. "Two-year clinical performance of cast post and core self-adhesive cementation." RSBO 14, no. 4 (December 20, 2017): 229–33. http://dx.doi.org/10.21726/rsbo.v14i4.671.
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Endodontically treated teeth commonly present extensive tissue loss, requiring the use intraradicular posts, which provide retention for a coronal rehabilitation. Cast post and cores (CPCs) have been traditionally used in cases of marked tooth tissue loss. Case report: This case report describes two cast post and cores and subsequent rehabilitation by metal ceramic crowns. The patient was followed-up at intervals of 12 and 24 months after the rehabilitation. The posts were cemented within the root canal with self-adhesive resin cement, in a way that guarantees a perfect sealing of the root and remains stable in the oral environment. Conclusion: Self-adhesive cements are a one-step material capable of providing additional chemical adhesion to the metal, creating a monoblock, quality not found in conventional resin cements, where the adhesion occurs only in the dentin-cement interface.
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Özcan, Mutlu, and Sofia Lamperti. "Effect of mechanical and air-particle cleansing protocols of provisional cement on immediate dentin sealing layer and subsequent adhesion of resin composite cement." Journal of Adhesion Science and Technology 29, no. 24 (September 18, 2015): 2731–43. http://dx.doi.org/10.1080/01694243.2015.1087254.
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Dias, Luana Mendonça, Janaina Emanuela Damasceno, Patricia Akemi Nishitani Shibasaki, Max José Pimenta Lima, Roberto Paulo Correia de Araújo, Richard Mark Foxton, and Andrea Nóbrega Cavalcanti. "Can surface protection prevent damage in margins of composite resin restorations after simulated endogenous erosion?" Brazilian Journal of Oral Sciences 18 (September 10, 2019): e191462. http://dx.doi.org/10.20396/bjos.v18i0.8656601.
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Aim: The study investigated the effect of using surface protection agents in the adaptation of external and internal margins of restorations subjected to simulated erosion. Methods: Cavities with margins in dentin were prepared in bovine incisors (n=120). Adhesive restorations were placed using a three-step etch&rinse adhesive system and nanofilled composite resin. The specimens were divided into four groups, according to the surface protection: negative control, topical application of fluoride (TAF), resin sealant and resin-modified glass ionomer varnish (RMGI varnish). Afterwards, they were divided into three sub-groups, according to the exposure to a simulated solution of gastric acid (DES) (5% HCl, pH=2,2) and subsequent remineralization (RE): negative control, 9 and 18 cycles of DES-RE. The evaluation of the tooth-restoration interface was performed on the internal and frontal images with the aid of a stereoscopic microscope (15x), and the percentage of continuous margins without adhesive failures was quantified. Results: In the external margins, only those groups with surface protection using sealants (resin and glass-ionomer) did not exhibit a significant decrease in the percentage of continuous margins after the erosive challenges. After 18 cycles of DES-RE, the use of resin-modified glass ionomer varnish resulted in the highest percentage of continuous margins. Conclusion: It was concluded that physically covering the surfaces with a sealing agent preserved the marginal adaptation of composite resin restorations exposed to endogenous erosive challenges.
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Tanner, Philipp G., Markus Holtmannspötter, Jörg-Christian Tonn, and Roland Goldbrunner. "EFFECTS OF DRUG EFFLUX ON CONVECTION-ENHANCED PACLITAXEL DELIVERY TO MALIGNANT GLIOMAS." Neurosurgery 61, no. 4 (October 1, 2007): E880—E882. http://dx.doi.org/10.1227/01.neu.0000298922.77921.f2.
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Abstract OBJECTIVE Convection-enhanced delivery (CED) is an approach in local brain tumor treatment. The spread of infusate in CED can be thought of as involving three phases: backflow, convection, and diffusion. Uncontrolled backflow may lead to efflux of the infusate outside the cranium. METHODS Based on an interim analysis of a clinical trial, the effects of drug efflux on convection were assessed. In a Phase I/II trial, eight patients with recurrent glioblastomas were treated with CED of paclitaxel. The first group of patients was treated with paclitaxel at a concentration of 0.5 mg/ml according to previously approved protocols. RESULTS These Group 1 patients developed severe skin necrosis due to an efflux of paclitaxel out of the cranium. The average volume of distribution (Vd) in these patients was 12.8 cm3. To prevent paclitaxel efflux, the burr hole was sealed with bone wax during and after CED in Groups 2 and 3. Surprisingly, patients in Group 2 showed a larger Vd (22.9 cm3 per catheter), exceeding the boundaries of the previous tumor, which led to subsequent neurological deficits. To allow a large Vd without severe side effects, the infusion volume was maintained, but the concentration of paclitaxel was reduced (paclitaxel concentration in Group 3, 0.25 mg/ml). CONCLUSION Vd remained high and no adverse effects were seen in Group 3. Sealing the burr hole during CED prevented efflux. The simple measure of sealing seems to increase Vd. These data demonstrate that uncontrolled backflow may have an important impact on CED and must be avoided.
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Wohltmann, Andreas. "Water vapour uptake and drought resistance in immobile instars of Parasitengona (Acari: Prostigmata)." Canadian Journal of Zoology 76, no. 9 (September 1, 1998): 1741–54. http://dx.doi.org/10.1139/z98-101.
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Eggs and protonymphs of a number of terrestrial Parasitengona were tested for drought resistance and their ability to take up atmospheric moisture. Species of the Erythraeoidea display higher drought resistance in both instars than species of the Trombidioidea. This is achieved by evolutionary modifications of the ground plan of the Parasitengona, including reduction of body openings and additional sealing of others with lipids, resulting in reduced water loss. Water vapour uptake is not evident in erythraeoid eggs or protonymphs but has been observed in the Trombidioidea and probably constitutes a characteristic of at least the stem species of the terrestrial Parasitengona. The resulting increase in fresh mass is about 50% before the protonymph stage begins; its role is probably not related to drought resistance or osmotic regulation. Instead, it presumably serves to extend the cuticle and thus provides more space for the development of the subsequent instar.
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Wei, Zhi Yuan, Yu Jun Liu, and Bo Zhou. "Distributions and Influence Factors of Residual Stresses Induced by Oxygen Cutting Opening in Steel Structure." Advanced Materials Research 314-316 (August 2011): 437–47. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.437.
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Oxygen cutting is the principal method for temporary hatch opening in hull structure. Residual stresses induced by oxygen cutting have a large influence on subsequent sealing and structure safety. Based on oxygen cutting theory, a heat source model was proposed with the combination of preheating flame and reaction heat between iron and oxygen, and a model was presented to simulate the cutting process on the basis of thermal elastoplastic FEM analysis, including the temperature and stress distribution. An oxygen cutting experiment was performed, in which an infrared radiation was used for surface temperature measurement. The residual stresses were measured by impact-indentation measurement. As a result, the calculation results were consistent with experiment values. The research concluded that there is a region in which the tensile stresses values exceed the yield point of material along the kerf, and the width of this region will be influenced by cutting velocity, opening dimension and longitudinal constraints.
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Reston, EG, RPR Bueno, LQ Closs, and J. Zettermann. "Fifteen-year Clinical Follow-up of Restoration of Extensive Cervical Resorption in a Maxillary Central Incisor." Operative Dentistry 42, no. 2 (March 1, 2017): E55—E58. http://dx.doi.org/10.2341/15-131-s.
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SUMMARY Internal bleaching in endodontically treated teeth requires care and protection to prevent harm to the periodontal ligament due to peroxide and may result in external root resorption. There is a myriad of treatment options when this occurs, such as monitoring, extraction, and subsequent rehabilitation with implants or fixed prosthodontics. In some cases, such as the one described here, a conservative attempt to maintain the tooth as a single structure can be made by sealing the resorptive defect. In the present case, we show a multidisciplinary approach where orthodontics, periodontics, and restorative dentistry were involved in treating the maxillary right central incisor (#8) of a 65-year-old patient with extensive cervical resorption, whose chief complaint was esthetics. The proposed treatment was extrusion of the tooth followed by curettage and restoration of the defect with glass ionomer cement. The patient has been followed for 15 years with no signs of recurrence, maintenance of periodontal health, and patient satisfaction with the esthetic outcome.
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Gorter, John, Sarah Poynter, Stewart Bayford, and Andrea Caudullo. "Glacially influenced petroleum plays in the Kulshill Group (Late Carboniferous–Early Permian) of the Southeastern Bonaparte Basin, Western Australia." APPEA Journal 48, no. 1 (2008): 69. http://dx.doi.org/10.1071/aj07007.
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Glacial deposits within the Lower Kulshill Group (Late Carboniferous-Early Permian) were initially recognised in cores from onshore wells in the southeastern Bonaparte Basin in the 1960s. Subsequent offshore wells have extended the distribution of the glaciogene units 100 km to the north. Their capacity to entrap oil and gas was proven by the Turtle and Barnett wells, located on the offshore Turtle High. Similar age glaciogene rocks occur within the Cooper Basin of central Australia, where they contain oil and gas reserves, and in the Canning, Carnarvon and Perth basins of Western Australia. Using sparse cores, electric logs, palynology and a sequence stratigraphic interpretation of 2D seismic data, the distribution of potential reservoir sandstones and sealing lithologies of the glaciogenic strata has been mapped for the offshore southeastern Bonaparte Basin. This study highlights the petroleum trapping potential associated with sub-glacial ice tunnel valley features, which are widespread in the offshore part of the basin.
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Schulz, Martin, Sophia Probst, Silvia Calabrese, Ana R. Homann, Nadine Borst, Marian Weiss, Felix von Stetten, Roland Zengerle, and Nils Paust. "Versatile Tool for Droplet Generation in Standard Reaction Tubes by Centrifugal Step Emulsification." Molecules 25, no. 8 (April 21, 2020): 1914. http://dx.doi.org/10.3390/molecules25081914.
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We present a versatile tool for the generation of monodisperse water-in-fluorinated-oil droplets in standard reaction tubes by centrifugal step emulsification. The microfluidic cartridge is designed as an insert into a standard 2 mL reaction tube and can be processed in standard laboratory centrifuges. It allows for droplet generation and subsequent transfer for any downstream analysis or further use, does not need any specialized device, and manufacturing is simple because it consists of two parts only: A structured substrate and a sealing foil. The design of the structured substrate is compatible to injection molding to allow manufacturing at large scale. Droplets are generated in fluorinated oil and collected in the reaction tube for subsequent analysis. For sample sizes up to 100 µL with a viscosity range of 1 mPa·s–4 mPa·s, we demonstrate stable droplet generation and transfer of more than 6 × 105 monodisperse droplets (droplet diameter 66 µm ± 3 µm, CV ≤ 4%) in less than 10 min. With two application examples, a digital droplet polymerase chain reaction (ddPCR) and digital droplet loop mediated isothermal amplification (ddLAMP), we demonstrate the compatibility of the droplet production for two main amplification techniques. Both applications show a high degree of linearity (ddPCR: R2 ≥ 0.994; ddLAMP: R2 ≥ 0.998), which demonstrates that the cartridge and the droplet generation method do not compromise assay performance.
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Bang, Hae-Jeen, Soo-Jung Hwang, Hyun-Sook Ham, and Jung-Myung Lee. "239 Seed Germination and Seedling Characteristics of Cucurbits as Affected by Dry Heat Treatment and Subsequent Handling." HortScience 35, no. 3 (June 2000): 432C—432. http://dx.doi.org/10.21273/hortsci.35.3.432c.
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Dry heat treatment has been commonly used to inactivate some seed-borne pathogens in vegetable seeds. Virtually all the gourd seeds for watermelon rootstock are being treated with dry heat to inactivate cucumber green mottle mosaic virus (CGMMV, a strain of tobamovirus) and Fusarium. Seeds of five gourd and one squash cultivars were treated with dry heat (35 °C for 24 h + 50 °C for 24 h + 75 °C for 72 h) and, immediately after the dry heat treatment, the seeds (moisture content of 1% or lower) were allowed to absorb atmospheric moisture in a moisture saturated chamber until the seed moisture contents reached 2% to 8%. After the equilibrium obtained, the seeds were sealed in air-tight bags and stored for 1 day or 30 days at 20 °C. The seeds were then sown in cell trays and the emergence and seedling characteristics were evaluated. Dry heat treatment caused significant delay in emergence in all tested cultivars, but had little or no influence on the final emergence rate. Moderate to severe injury was observed in seedlings grown from dry heat-treated seeds in three out of six cultivars tested. However, little or no dry heat phytotoxicity was observed in other cultivars, thus suggesting the marked differences in cultivar susceptibility to dry heat treatment. Rapid humidification before sealing also appeared to reduce the early emergence rate in some cultivars, but had no effect on the final emergence rate in most cultivars. Storage of dry heat-treated seeds in sealed bags for 30 days before sowing was highly effective in minimizing the phytotoxicity symptoms in seedlings as compared to the seedlings grown from the seeds sown immediately after the dry heat treatment. This suggests that the reestablishment of metabolic process required for normal seed germination requires a long period after the dry heat treatment. Other characteristics associated with DH treatment will also be presented.
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Hopkins, Roy M. "THE CENTRAL AUSTRALIAN BASINS." APPEA Journal 29, no. 1 (1989): 347. http://dx.doi.org/10.1071/aj88030.
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The Amadeus and Ngalia Basins are two of several intracratonic basins situated in the central region of the Australian Continent and underlain by Upper Proterozoic and Lower Palaeozoic sedimentary rocks.In the Amadeus Basin, the preserved sedimentary section has been deformed by several orogenic events through geological history, with salt tectonics playing an important role in the structural evolution. The Ordovician System is the primary exploration objective. The Cambrian and Proterozoic sequences, which also carry rock strata having source, reservoir and sealing properties, are secondary targets. However, these latter units are sparsely explored, and only limited information is available on their petroleum prospectiveness. Three of the four petroleum accumulations found to date are in Ordovician sandstones, with the fourth accumulation contained in Cambrian sandstones.The initial drilling phase in the Amadeus Basin in the early 1960s was concentrated on geologically defined surface antic :nes, with seismic surveying becoming the principal technique employed in subsequent exploration phases. The ongoing work has demonstrated a major untested structural play associated with a regional thrust fault system — in particular, combination dip and fault closures developed on the underthrust blocks. Stratigraphic prospects also are present in the Amadeus Basin, but none of these yet has been drilled.The Ngalia Basin is similar stratigraphically and structurally to the Amadeus Basin and is considered prospective for oil and gas. Much less work has been done in the Ngalia than in the Amadeus, with only one well drilled in the entire basin. The well yielded a gas snow from a Proterozoic formation, and other direct hydrocarbon indications have been recorded elsewhere in the basin. Rock units having source, reservoir and sealing parameters are present, as are structures capable of forming traps. Again, these are associated largely with a complex regional thrust fault system.
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Tirali, RE, C. Çelik, N. Arhun, G. Berk, and SB Cehreli. "Effect of Laser and Air Abrasion Pretreatment on the Microleakage of a Fissure Sealant Applied with Conventional and Self Etch Adhesives." Journal of Clinical Pediatric Dentistry 37, no. 3 (April 1, 2013): 281–88. http://dx.doi.org/10.17796/jcpd.37.3.v8588321xr13290r.
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Aim: The purpose of this study was to investigate the effects of different pretreatment protocols along with different bonding agents on the microleakage of a fissure sealant material. Method: A total of 144 freshly extracted noncarious human third molars were used. The teeth were randomly assigned into three groups with respect to the pretreatment protocol employed: A. Air Abrasion B. Er,Cr:YSGG laser C. No pretreatment (Control). In each group specimens were further subjected to one of the following procedures before application of the sealant: 1. %36 Phosphoric acid-etch (AE) (DeTrey Conditioner 36/ Denstply, UK) 2.AE+Prime&Bond NT (Dentsply,UK) 3.Clearfil S3 Bond (Kuraray, Japan) 4.Clearfil SE Bond (Kuraray, Japan). All teeth were sealed with the same fissure sealant material (Conseal F/ SDI, Australia). Sealed teeth were further subjected to thermocycling, dye penetration test, sectioning and quantitative image analysis. Statistical evaluation of the microleakage data was performed with two way independent ANOVA and multiple comparisons test at p=0.05. For qualitative evaluation 2 samples from each group were examined under Scanning Electron Microscopy. Results: Microleakage was affected by both the type of pretreatment and the subsequent bonding protocols employed (p<0.05). Overall, the highest (Mean=0.36mm) and lowest (Mean=0.06 mm) microleakage values were observed in samples with unpretreated enamel sealed by S3+Conseal F and samples with laser pretreated enamel sealed by Acid Etch+Prime&Bond+Conseal F protocols, respectively (p<0.05). In the acid-etch group samples pretreated with laser yielded in slightly lower microleakage scores when compared with unpretreated samples and samples pretreated with air abrasion but the statistical significance was not important (p=0,179). Similarly, when bonding agent is applied following acid-etching procedure, microleakage scores were not affected from pretreatment protocol (p=0,615) (intact enamel/laser or air-abrasion). For both all-in one and two step self etch adhesive systems, unpretreated samples demonstrated the highest microleakage scores. Conclusions: For the groups in which bonding agent was utilized, pretreatments did not effected microleakage. Both the tested pretreatment protocols and adhesive procedures had different effects on the sealing properties of Conseal F in permanent tooth enamel.
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Peshnev, B. V., A. S. Filimonov, S. V. Baulin, O. S. Sledz, and N. Yu Asilova. "THE PYROCARBON FORMATION MECHANISM DURING THE HYDROCARBON PYROLYSIS PROCESS." Fine Chemical Technologies 12, no. 4 (August 28, 2017): 36–42. http://dx.doi.org/10.32362/2410-6593-2017-12-4-36-42.
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Experimental results confirming the mechanism of pyrocarbon formation through the steps of high-molecular pyrolysis products forming in the gas phase are presented. Adsorption of high-molecular pyrolysis products on the active centers of the substrate localized at the boundaries of the contacts of its crystallites and their subsequent carbonization is confirmed. The decreasing in the length of the substrate crystallites contact boundaries leads to the increase in the content of high-molecular compounds in the gas and to the decrease in the hydrogen concentration is shown. The relation between the composition of the exhaust gas and the surface of the sealing material creates the prerequisites for controlling the pyro-consolidation process according the composition of the off-gas. The composition of high-molecular liquid pyrolysis products was identified. The difference in the composition of high-molecular pyrolysis products of the propane-butane fraction and the electric cracking gas was established. The influence of raw materials and pyrolysis conditions on the group composition of high-molecular pyrolysis products formed is shown.
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Ma, Ben, Hai Qing Li, Xu Deng, and Min Li. "Cross-Section Shape Optimization of Expandable Cased-Hole Liners." Advanced Materials Research 156-157 (October 2010): 1141–45. http://dx.doi.org/10.4028/www.scientific.net/amr.156-157.1141.
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Expandable cased-hole liners is to solve the sealing problem of level six multilateral wells. It is a trigeminal expandable tube which is usually prefabricated on the ground and re-expanded when placed in the proper position. In this paper, the trigeminal expandable tubular compression molding process of the pre-forming stage is mainly studied. In this compression process, both sides of the branch pipe should be compressed to a certain shape in order to successfully enter the main borehole; meanwhile, we want to make sure that failures such as rupture do not occur in the subsequent expansion process. According to the theory about sheet metal bending forming process, three different shapes of the mold are designed to control the cross-section shape of the compressed trigeminal expandable tube so that it meets the application requirements. Rack-shaped cross-section is finally selected as a reference of the best through simulation of compression process and comparative analysis of simulation results. At last, field tests show that this cross-section shape is compatible with the theoretical and simulation results.
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Mertens, Alexander E. E., Tomasz P. Rygiel, Cristina Olivo, Rob van der Kammen, and John G. Collard. "The Rac activator Tiam1 controls tight junction biogenesis in keratinocytes through binding to and activation of the Par polarity complex." Journal of Cell Biology 170, no. 7 (September 26, 2005): 1029–37. http://dx.doi.org/10.1083/jcb.200502129.
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The GTPases Rac and Cdc42 play a pivotal role in the establishment of cell polarity by stimulating biogenesis of tight junctions (TJs). In this study, we show that the Rac-specific guanine nucleotide exchange factor Tiam1 (T-lymphoma invasion and metastasis) controls the cell polarity of epidermal keratinocytes. Similar to wild-type (WT) keratinocytes, Tiam1-deficient cells establish primordial E-cadherin–based adhesions, but subsequent junction maturation and membrane sealing are severely impaired. Tiam1 and V12Rac1 can rescue the TJ maturation defect in Tiam1-deficient cells, indicating that this defect is the result of impaired Tiam1–Rac signaling. Tiam1 interacts with Par3 and aPKCζ, which are two components of the conserved Par3–Par6–aPKC polarity complex, and triggers biogenesis of the TJ through the activation of Rac and aPKCζ, which is independent of Cdc42. Rac is activated upon the formation of primordial adhesions (PAs) in WT but not in Tiam1-deficient cells. Our data indicate that Tiam1-mediated activation of Rac in PAs controls TJ biogenesis and polarity in epithelial cells by association with and activation of the Par3–Par6–aPKC polarity complex.
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WRIGHT, JONATHAN C., and MICHAEL J. O'DONNELL. "OSMOLALITY AND ELECTROLYTE COMPOSITION OF PLEON FLUID IN PORCELLIO SCABER (CRUSTACEA, ISOPQDA, ONISCIDEA): IMPLICATIONS FOR WATER VAPOUR ABSORPTION." Journal of Experimental Biology 164, no. 1 (March 1, 1992): 189–203. http://dx.doi.org/10.1242/jeb.164.1.189.
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Active water vapour absorption in Porcellio scaber is associated with the endogenous production of strongly hyperosmotic fluid in the pleoventral chamber (pleoventralraum; PV). Pre-desiccated animals show increased pleon fluid secretion within 1–2 min of transfer to suprathreshold humidities (>87 % relative humidity). The conspicuous increase in fluid volume is accompanied by a rise in osmolality from isosmotic (approximately 750mosmolkg−1) up to as much as 8.2osmolkg−1. Vapour absorption is marked by the onset of metachronal pleopodal ventilation and a subsequent decline in fluid osmolality as uptake fluid approaches equilibrium with ambient water activities. The effects of sealing of the PV by the margins of the depressed pleopods, along with the observation that animals ventilate even when PV fluid activities are somewhat below ambient, suggest that resultant pressure increases may elevate humidity within the PV and thereby augment vapour uptake. Ion-selective microelectrode measurements of Na+, K+, Ca2+ and Cl− concentrations in nanolitre samples of isolated pleon fluid identify Na+ and Cl− as the major osmolytes. Possible preadaptions favouring evolution of vapour absorption in the Oniscidea are discussed
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J. E. Apugllon, E. Andrango, A. D. Durán P. J. Nazareno, and Carlos Jácome. "Biopolymers: Impact of Polymers that Replace Conventional Plastics, An Option for a Sustainable Future." International Journal of Current Microbiology and Applied Sciences 10, no. 9 (September 10, 2021): 492–97. http://dx.doi.org/10.20546/ijcmas.2021.1009.057.
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The work carried out focuses on the importance and characteristics of bioplastics, which is why the bibliographic sources consulted recall that the plastic manufactured from biopolymers has been increasing due to its practicality and in supporting the reduction of pollution of solid waste worldwide. Viable alternatives are currently being sought to replace packaging and coatings made from non-renewable raw materials, as these cause millions of tons of waste each year, damaging the environment. The production process of biodegradable plastics has a certain resemblance to the production of conventional plastics, it consists of a mixer of raw materials with additional components, for a subsequent blowing and sealing, passing through a quality control. One of the problems with conventional plastics is that they are manufactured from raw materials obtained from non-renewable resources, which each day becomes scarcer and therefore more expensive. Also the problem of persistence in the medium for very long times, which cause them to occupy space in sanitary landfills, which are causing problems in the country due to lack of space.
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Dzieciuchowicz, Łukasz, Jolanta Tomczak, Ewa Strauss, and Grzegorz Oszkinis. "Mid-Term Results of Endovascular Aneurysm Sealing in the Treatment of Abdominal Aortic Aneurysm With Unfavorable Morphology." Vascular and Endovascular Surgery 55, no. 1 (October 9, 2020): 39–49. http://dx.doi.org/10.1177/1538574420965736.
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Purpose: To report mid-term results of endovascular aneurysm sealing (EVAS) of abdominal aortic aneurysms (AAA) deemed unsuitable for a standard endovascular aneurysm repair (EVAR). Methods: A prospectively maintained database of 42 patients with EVAR-unfavorable anatomy treated by EVAS combined with chimney grafts in case of the proximal AAA neck shorter than 5 mm was analyzed. Early outcomes included final angiographic result, intra- and early post-operative deaths, and complications. Mid-term outcomes included all-cause mortality (ACM), aneurysm-related mortality (ARM), patency of the stents, occurrence of endoleaks, serious complications and graft failures defined as the AAA growth of more than 5 mm, type I endoleak, occlusion of the stent-graft or chimney graft, aorto-duodenal fistula, or aneurysm rupture. Results: The procedure was completed in all patients. Twenty-eight chimney grafts were implanted in 19 patients. Patients were followed for a median of 24 months (range 12-34 months). There were 2 intraoperative ruptures and 1 patient died in an early postoperative period. The cumulative ACM was 15, 21, and 36% at 12, 24, and 36 months, respectively, and the cumulative ARM was 8, 11, and 27% at 12, 24, and 36 months, respectively. Three out of 5 aneurysm-related deaths were due to a secondary aorto-duodenal fistula. The cumulative incidence of graft failure was 20, 27, and 42% at 12, 24, and 36 months, respectively. The cumulative incidence of an endoleak was 5, 9, and 23% at 12, 24, and 36 months, respectively. The graft failure increased significantly both ACM (p = .012) and ARM (p = .00003). The implantation of chimney grafts at the initial procedure increased ARM significantly (p = .008). The presence of an endoleak did not have any significant influence on ACM and ARM. Conclusion: Patients treated with EVAS for AAAs with EVAR-unfavorable anatomy, especially those with chimney grafts, exhibit a high risk of graft failure and subsequent death.
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Ichard, J. C., R. Pailler, and Jacques Lamon. "Ceramic Matrix Composite with Increased Thermal Conductivity." Advances in Science and Technology 45 (October 2006): 1405–10. http://dx.doi.org/10.4028/www.scientific.net/ast.45.1405.
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The purpose of the study was to increase the thermal conductivity of multilayered and self-sealing ceramic matrix composites via the silicon melt infiltration process. The first step of the process consisted in filling porosity using various organic xerogels by the sol-gel route. Carbon xerogels obtained by subsequent pyrolysis may reduce and homogenize the porous network within the composite. Cracking of the xerogels due to volumic shrinkage occurring during air drying may be decreased by controlling the initial parameters as concerns the gel solution and/or by operating a second impregnation/pyrolysis step. Filling of such composites by liquid silicon revealed that a specific route and particular conditions are necessary to eliminate porosity by controlling gas production species from pore surface at high temperature. This may be achieved through a directional flow and using highly viscous silicon (thanks to a localized wick), and by keeping the sides of the materials permeable to gas. This led to composite materials with a thermal conductivity which was four times as high as that of those materials densified via CVI. An increase in mechanical properties was also observed.
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Jeong, Gi Young, and Chang-Sik Cheong. "Recurrent events on a Quaternary fault recorded in the mineralogy and micromorphology of a weathering profile, Yangsan Fault System, Korea." Quaternary Research 64, no. 2 (July 18, 2005): 221–33. http://dx.doi.org/10.1016/j.yqres.2005.05.008.
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AbstractRecurrence characteristics of a Quaternary fault are generally investigated on the basis of field properties that are rapidly degraded by chemical weathering and erosion in warm humid climates. Here we show that in intense weathering environments, mineralogical and micromorphological investigations are valuable in paleoseismological reconstruction. A weathering profile developed in Late Quaternary marine terrace deposits along the southeastern coast of the Korean Peninsula was disturbed by tectonic movement that appears to be a simple one-time reverse faulting event based on field observations. A comparative analysis of the mineralogy, micromorphology, and chemistry of the weathering profile and fault gouge, however, reveals that both the microfissures in the deformed weathering profile and larger void spaces along the fault plane were filled with multi-stage accumulations of illuvial clay and silt minerals of detrital origin, suggesting a repetition of fissuring and subsequent sealing in the weathering profile as it underwent continuous mineralogical transformation and particle translocation. We reconstruct a sequence of multiple faulting events unrecognized in previous field surveys, which requires revision of the view that the Korean Peninsula was tectonically stable, during the Late Quaternary.
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Kubeev, Ermat, and Viktor Smelilk. "Device and Method of Formation of Porous Nutritional Coating on Seeds." E3S Web of Conferences 210 (2020): 03006. http://dx.doi.org/10.1051/e3sconf/202021003006.
Full textAbstract:
Modern technologies for applying artificial shells are based on the principles of rolling or granulating with subsequent drying. This technology does not allow to get a gas - permeable porous shell, which often leads to the death of seeds during the formation of the shell, storage and transportation, and slow growth at the early stages of plant development. The aim of the research is to develop a new method and device for pre-sowing treatment of agricultural seeds, which can increase their germination, germination energy and ensure crop growth. A distinctive feature of the new method is that the shell is formed not by rolling, but by molding around the seed, followed by drying in a soft mode. This will form a porous, gas-permeable structure around the seed. Based on the mathematical description of the processes occurring during the introduction of seeds into the nutrient medium, the design calculations and calculations made a laboratory stand for the study of the seeds coating with a protective and nutritious shell, which consists of a mixing, sealing and seeding nodes. A series of experiments was conducted to study the operation of the stand in various modes. Optimal operating modes are identified.
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Wiktorowski, Damian, Marek Krąpiec, Andrzej Rakowski, and Alexander Cherkinsky. "Status of the ams graphitization system in the dendrochronological laboratory at Agh-Ust, Kraków." Geochronometria 47, no. 1 (January 1, 2020): 112–17. http://dx.doi.org/10.2478/geochr-2020-0024.
Full textAbstract:
Abstract A new system for the preparation of graphite samples for radiocarbon (14C) measurement using an accelerator mass spectrometer (AMS) has been built in the Dendrochronological Laboratory at AGH-UST, Kraków. This system consists of three independent components. The first is the equipment for mechanical and chemical sample pre-treatment. The second is the vacuum line for sample sealing and the purification of CO2. The third and central part of this system is a graphitization line, where graphite is produced from CO2. In the first stage, chemical sample preparation was carried out to remove impurities. IAEA and NIST OxII standard materials were converted to CO2 without pre-treatment. In the next step, samples were combusted to CO2. The resulting CO2 was released under vacuum and cryogenically purified for subsequent graphitization. The performance of the system was tested with NIST OxII, IAEA standards (IAEA C5, C6 and C7) and background samples. The test confirms good reproducibility of results obtained for the samples prepared using this system. The results of the 49 samples of NIST Ox-II, IAEA standards and blank samples were presented in this article.
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Hirata-Tsuchiya, Shizu, Shigeki Suzuki, Takashi Nakamoto, Naoya Kakimoto, Satoru Yamada, and Hideki Shiba. "Surgical Sealing of Laterally Localized Accessory Root Canal with Resin Containing S-PRG Filler in Combination with Non-Surgical Endodontic Treatment: A Case Report." Dentistry Journal 8, no. 4 (November 20, 2020): 131. http://dx.doi.org/10.3390/dj8040131.
Full textAbstract:
The spread of root canal infection to surrounding periodontal tissue through accessory root canals reduces the success rate of endodontic treatment. In this case, cone-beam computed tomography revealed a lesion (4 mm from the apex) resulting from an accessory root canal of the maxillary left central incisor. First, non-surgical endodontic treatment was conducted but the sinus tract remained. Surgical preparation of the root cavity was then conducted to remove potentially infected dentin surrounding the accessory root canal. The cavity was filled and the foramen was sealed with resin containing bioactive surface pre-reacted glass (S-PRG) filler. The photopolymerized resin was then contoured and polished. In combination with subsequent supportive non-surgical endodontic treatment, a good clinical outcome with the disappearance of the sinus tract and clinical symptoms such as discomfort and pressure pain and the regeneration of the alveolar bone hanging over the cavity was obtained. In this case, the good clinical outcome may have been due to the dentin-adhesive property and durability of the pre-adhesive system and composite resin. The better biocompatibility of S-PRG fillers presumably facilitated periodontal tissue healing.