Browse Articles
Discover research articles across all indexed journals
Development of a smoking simulation machine to evaluate the effects of smoking on the color change of dental restorative materials
Abstract To develop a smoking simulation machine, the study evaluated the effects of conventional and electronic cigarette smoke on the color stability of resin-based composites. Two types of nanohybrid resin-based composites were divided into two groups based on the material and subgroups according to the kind of exposure: electronic cigarettes, conventional cigarettes, and control. The exposure was by using a newly developed smoking simulation machine, and color change was the primary outcome, measured with a spectrophotometer and calculated using ΔEab. The results showed significant differences in color change were observed between the groups and subgroups (p < 0.001). Specimens exposed to conventional cigarettes exhibited more significant discoloration compared to those exposed to electronic cigarettes and control. The custom-made machine demonstrated the ability to simulate smoking conditions and their effects on dental materials. The machine provides a standard and controlled method for evaluating smoke’s effects on restorative materials, while not all materials exhibited similar reactions under the same smoking conditions. The machine impacts dental materials testing and accurately simulates the oral environment, providing insights into material performance that helps formulate materials that resist tobacco smoke, improve restoration durability with esthetics, enhance patient outcomes, and guide material selection.
Assessment of Marginal and Internal Fit of Implant-supported Monolithic Zirconium Single Crown Fabricated from Three Different Intraoral Scanners: An In Vitro Study
Atomic Ga triggers spatiotemporal coordination of oxygen radicals for efficient water oxidation on crystalline RuO2
Development of an efficient mid-field wireless power transmission system for biotelemetric IoT medical devices
Effect of Yttria Percentage and Different Surface Treatments on the Flexural Strength of Zirconia Materials: An In Vitro Study
Structure and mechanism of a mycobacterial isoniazid efflux pump MsRv1273c/72c with a degenerate nucleotide-binding site
Abstract Heterodimeric ATP-binding cassette (ABC) transporters containing one catalytically impaired degenerate nucleotide-binding site (NBS) have a mechanism different from those with two active NBSs. However, the structural basis of their transport mechanism remains to be explained. Here, we determine mycobacterial MsRv1273c/72c to be an isoniazid efflux pump and determine several structures by cryo-electron microscopy showing specific asymmetrical features including an N-terminal extending loop and a periplasmic helical hairpin only found in MsRv1272c. In addition, we capture three distinct asymmetric states where the nucleotide-binding domains are partially dimerized at the degenerate site. Using these intermediate states, the D-WalkerB loop and X-signature loop of MsRv1272c modulate and couple the function of both NBSs through conformational changes. Thus, these data provide insights into the mechanism of this heterodimeric ABC transporter containing a degenerate NBS. The structures also provide a framework for the rational design of anti-tuberculosis drugs targeting this drug-efflux pump.
Exploring the molecular mechanisms underlying intervertebral disc degeneration by analysing multiple datasets
Effectiveness of Photobiomodulation with and without Hyaluronic Acid Gel on Gingival Depigmentation: A Randomized Control Clinical Trial
Non-human primate seasonal transcriptome atlas reveals seasonal changes in physiology and diseases
Host and environmental factors drive prevalence of the pathogen Batrachochytrium dendrobatidis in Central African amphibians
A scalable photo-mechanochemical platform for sustainable photoredox catalysis by resonant acoustic mixing
Path analysis of predictors of frailty in hospitalised patients with chronic obstructive pulmonary disease
Enantioselective dearomative ortho-cycloaddition transformation of unactivated arenes by cage-confined visible-light photocatalysis
A comprehensive analysis of nutritional, phytochemical, and antioxidant benefits of an underutilized fruit Tetrastigma leucostaphylum
Investigative needle core biopsies support multimodal deep-data generation in glioblastoma
Electric vehicle integrated tidal-solar-wind-hydro-thermal systems for strengthing the microgrid and environment sustainability
Abstract Incorporating electric vehicles (EVs) into the power grid significantly impacts its safe and reliable operation, while the unpredictable nature of wind power adds further complications. Solar power, though less efficient in converting sunlight to electricity compared to wind power, remains a popular renewable energy source. Combining wind and solar energy is advantageous because wind energy can be harnessed both day and night, unlike solar energy. Tidal energy also offers a reliable renewable option, although it has its own set of challenges. Consequently, the utilization of renewable energy sources (RESs) have become increasingly complex. Fossil fuels, on the other hand, are a major cause of severe pollution. This study addresses integration of wind, solar, tidal, and electric vehicles, using a unique moth-flame optimization technique, to solve the challenge of hydrothermal scheduling (HTS). The primary objective is to reduce power generation costs while adhering to various limitations, including transmission losses, thermal unit valve point effects, and RESs variability. In order to maximize energy management, several EVs are currently being built as virtual power plants (VPPs), utilizing sustainable energy sources. So, VPPs and combined renewable energy sources make the micro-grid more rigid. The objective is to minimize fuel expenditures by balancing load demand and transmission losses while satisfying all conditions. By evaluating the generation costs with MFO, this study demonstrates the effectiveness of the method and compares it with other advanced optimization techniques, highlighting its superior efficiency, utility and reliability. When the performance of normal HTS system, RES and EV based HTS system are observed, it is clearly observed that RESs based system has improved the results by 5.49% as compared to the conventional system using the suggested COMFO approach. The findings also show that EVs can effectively contribute to a hydro-thermal scheduling system with integrated renewable energy by using grid power.
Photocatalytic synthesis of ethylene glycol and hydrogen from methyl tert-butyl ether
Least squares residual power series solutions for Kawahara and Rosenau-Hyman nonlinear wave interactions with applications in fluid dynamics
Abstract The present study uses the least squares residual power series (LSRPS) method to obtain approximate solutions to the nonlinear fractional-order Kawahara and Rosenau- Hyman equations. This method combines the residual power series (RPS) technique and the least squares approach. The calculations are obtained using Caputo’s sense as a basis. To obtain approximations of solutions, the well-known RPS method is first used. The functions are then proven to be linearly independent by checking the Wronskian determinant at fractional order. Next, a system of linear equations is generated and processed using the least squares approach. Using the least squares method, which uses fewer expansion terms than the classical RPS method, approximate solutions are determined. The problems presented below demonstrate how much faster the proposed method converges compared to the RPS method. Numerical results are presented to demonstrate the efficiency, accuracy, and rapid convergence of the method.
Canalized light creates directional and switchable surface structures in vanadium dioxide
Abstract Materials with switchable nanostructured surfaces enable optical and electronic functionalities beyond those of natural materials. Here we report the creation of self-organized, re-writable, laser-induced surface structures in single-crystalline vanadium dioxide. We discover anisotropic features caused by canalized surface plasmon polaritons that can only propagate along one crystal axis. The nanostructures remain mostly single-crystalline and preserve the material’s sharp metal-to-insulator transition, enabling femtosecond switching by temperature or light.