ORCID Profile
0000-0002-2215-7450
Current Organisations
University of Sydney
,
Australian National University
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Publisher: Springer Science and Business Media LLC
Date: 02-07-2021
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier
Date: 2023
Publisher: Sri Lanka Journals Online (JOL)
Date: 14-06-2017
Publisher: Elsevier BV
Date: 07-2022
Publisher: Springer Science and Business Media LLC
Date: 13-08-2018
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 11-1996
DOI: 10.1016/S0003-9969(96)00036-2
Abstract: Characterization of the dental pulp proteoglycans has been largely confined to the glycosaminoglycan component of the proteoglycan molecule, while the protein core has received little attention. This study was conducted to identify mRNAs of previously well-characterized proteoglycans-biglycan, decorin and versican-and link protein in dental pulp cells. Dermal fibroblasts were used as a positive control. Oligonucleotide probes were constructed based on published sequences for the four proteins from human tissues. Total RNA was isolated from cultured human pulp and dermal cells, separated according to size by formaldehyde gel electrophoresis and subsequently transferred to a nylon filter. Northern hybridizations using the oligonucleotide probes revealed the expression of biglycan, decorin, versican and link protein mRNAs. Biglycan and decorin are small proteoglycans that have a regulatory effect on collagen fibrillogenesis. Assuming expression of link protein and versican in vivo, the larger proteoglycans in the dental pulp are capable of forming large proteoglycan aggregates.
Publisher: Wiley
Date: 02-1997
DOI: 10.1111/J.1600-9657.1997.TB00009.X
Abstract: Combined trauma involving intrusive luxation of one tooth and avulsion of another is rare. A case is presented involving the endodontic management of two traumatised maxillary central incisors, one of which was intrusively luxated and the other avulsed. Spontaneous re-eruption of the intruded tooth occurred, thereby avoiding the need to further traumatise the periodontal ligament with either orthodontic or surgical repositioning, and allowing endodontic therapy to be carried out uneventfully. Endodontic therapy of the avulsed tooth was completed and its prognosis is considered good.
Publisher: Springer Science and Business Media LLC
Date: 21-10-2020
Publisher: Elsevier BV
Date: 02-2022
Publisher: Elsevier BV
Date: 04-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1GC00198A
Abstract: This work demonstrates the plasma-bubble as an energy efficient and sustainable approach for green and decentralised H 2 O 2 production.
Publisher: Elsevier BV
Date: 03-2018
Publisher: MDPI AG
Date: 05-2020
DOI: 10.3390/NANO10050874
Abstract: Silver nanoparticles have applications in plasmonics, medicine, catalysis and electronics. We report a simple, cost-effective, facile and reproducible technique to synthesise silver nanoparticles via plasma-induced non-equilibrium liquid chemistry with the absence of a chemical reducing agent. Silver nanoparticles with tuneable sizes from 5.4 to 17.8 nm are synthesised and characterised using Transmission Electron Microscopy (TEM) and other analytic techniques. A mechanism for silver nanoparticle formation is also proposed. The antibacterial activity of the silver nanoparticles was investigated with gram-positive and gram-negative bacteria. The inhibition of both bacteria types was observed. This is a promising alternative method for the instant synthesis of silver nanoparticles, instead of the conventional chemical reduction route, for numerous applications.
Publisher: Springer Science and Business Media LLC
Date: 23-03-2021
Publisher: Sri Lanka Journals Online (JOL)
Date: 15-12-2022
Publisher: Wiley
Date: 26-07-2022
Abstract: Carbon quantum dots (CQDs, C‐dots or CDs) are an emerging type of nanomaterial which has received immense attention due to their numerous applications. However, most of the reported CQDs in literature typically emit single emission peak under an excitation. Multipeak emissions without any complicated techniques will be ideal for various applications in the fields of ratiometric sensing, optoelectronics, and multifunctional bio‐imaging systems. Here, a fast, effective, and single‐step method is developed for the bulk synthesis of CQDs using atmospheric pressure air plasmas. Structural, morphological, and chemical properties are characterized by advanced analytical techniques. The CQDs have an average diameter of about 3 nm with a narrow size distribution. Emission wavelengths of 470 nm for blue emissive CQDs and 515 nm for green emissive CQDs are observed. Concentration dependency of the CQDs suggests that the switchable mechanism is due to the formation of PTSA excimers. Dual‐emissive CQDs have the potential to be used in bi‐channel ratiometric determination for metal ions, pH sensing, tumor diagnosis and detection, and solid‐state lighting materials. The proof‐of‐principle demonstration of the use of dual‐emissive CQDs (DCQDs) as a fluorescent sensor of Cu 2+ ions is also presented to highlight the possible applications.
Publisher: Elsevier BV
Date: 11-2021
Publisher: Wiley
Date: 11-02-2010
Publisher: Springer Science and Business Media LLC
Date: 07-2021
Publisher: Ivyspring International Publisher
Date: 2022
DOI: 10.7150/THNO.70098
Publisher: MDPI AG
Date: 30-05-2023
DOI: 10.3390/NANO13111763
Abstract: Recent advancements in space technology and reduced launching cost led companies, defence and government organisations to turn their attention to low Earth orbit (LEO) and very low Earth orbit (VLEO) satellites, for they offer significant advantages over other types of spacecraft and present an attractive solution for observation, communication and other tasks. However, keeping satellites in LEO and VLEO presents a unique set of challenges, in addition to those typically associated with exposure to space environment such as damage from space debris, thermal fluctuations, radiation and thermal management in vacuum. The structural and functional elements of LEO and especially VLEO satellites are significantly affected by residual atmosphere and, in particular, atomic oxygen (AO). At VLEO, the remaining atmosphere is dense enough to create significant drag and quicky de-orbit satellites thus, thrusters are needed to keep them on a stable orbit. Atomic oxygen-induced material erosion is another key challenge to overcome during the design phase of LEO and VLEO spacecraft. This review covered the corrosion interactions between the satellites and the low orbit environment, and how it can be minimised through the use of carbon-based nanomaterials and their composites. The review also discussed key mechanisms and challenges underpinning material design and fabrication, and it outlined the current research in this area.
Publisher: Wiley
Date: 29-02-2016
DOI: 10.1111/ADJ.12401
Abstract: Endodontic management of the permanent immature tooth continues to be a challenge for both clinicians and researchers. Clinical concerns are primarily related to achieving adequate levels of disinfection as 'aggressive' instrumentation is contraindicated and hence there exists a much greater reliance on endodontic irrigants and medicaments. The open apex has also presented obturation difficulties, notably in controlling length. Long-term apexification procedures with calcium hydroxide have proven to be successful in retaining many of these immature infected teeth but due to their thin dentinal walls and perceived problems associated with long-term placement of calcium hydroxide, they have been found to be prone to cervical fracture and subsequent tooth loss. In recent years there has developed an increasing interest in the possibility of 'regenerating' pulp tissue in an infected immature tooth. It is apparent that although the philosophy and hope of 'regeneration' is commendable, recent histologic studies appear to suggest that the calcified material deposited on the canal wall is bone/cementum rather than dentine, hence the absence of pulp tissue with or without an odontoblast layer.
Publisher: Elsevier BV
Date: 2023
DOI: 10.1016/J.TIBTECH.2022.08.001
Abstract: Global environmental, social, and economic challenges call for innovative solutions to food production. Current food production systems require advances beyond traditional paradigms, acknowledging the complexity arising from sustainability and a present lack of awareness about technologies that may help limit, for ex le, loss of nutrients from soil. Aquaponics, a closed-loop system that combines aquaculture with hydroponics, is a step towards the more efficient management of scarce water, land, and nutrient resources. However, its large-scale use is currently limited by several significant challenges of maintaining desirable water chemistry and pH, managing infections in fish and plants, and increasing productivity efficiently, economically, and sustainably. This paper investigates the opportunities presented by plasma technologies in meeting these challenges, potentially opening new pathways for sustainability in food production.
Publisher: Elsevier BV
Date: 03-2022
DOI: 10.1016/J.CHEMOSPHERE.2021.132757
Abstract: Antibiotics have been extensively used as pharmaceuticals for erse applications. However, their overuse and indiscriminate discharge to water systems have led to increased antibiotic levels in our aquatic environments, which poses risks to human and livestock health. Non-thermal plasma water. However, the issues of process scalability and the mechanisms towards understanding the plasma-induced degradation remain. This study addresses these issues by coupling a non-thermal plasma jet with a continuous flow reactor to reveal the effective mechanisms of amoxicillin degradation. Four industry-relevant feeding gases (nitrogen, air, argon, and oxygen), discharge voltages, and frequencies were assessed. Amoxicillin degradation efficiencies achieved using nitrogen and air were much higher compared to argon and oxygen and further improved by increasing the applied voltage and frequency. The efficiency of plasma-induced degradation depended on the interplay of hydrogen peroxide (H
Publisher: Springer Science and Business Media LLC
Date: 04-2022
DOI: 10.1007/S40820-022-00832-6
Abstract: Oxygen vacancies ( V o ) in electrocatalysts are closely correlated with the hydrogen evolution reaction (HER) activity. The role of vacancy defects and the effect of their concentration, however, yet remains unclear. Herein, Bi 2 O 3 , an unfavorable electrocatalyst for the HER due to a less than ideal hydrogen adsorption Gibbs free energy (Δ G H* ), is utilized as a perfect model to explore the function of V o on HER performance. Through a facile plasma irradiation strategy, Bi 2 O 3 nanosheets with different V o concentrations are fabricated to evaluate the influence of defects on the HER process. Unexpectedly, while the generated oxygen vacancies contribute to the enhanced HER performance, higher V o concentrations beyond a saturation value result in a significant drop in HER activity. By tunning the V o concentration in the Bi 2 O 3 nanosheets via adjusting the treatment time, the Bi 2 O 3 catalyst with an optimized oxygen vacancy concentration and detectable charge carrier concentration of 1.52 × 10 24 cm −3 demonstrates enhanced HER performance with an overpotential of 174.2 mV to reach 10 mA cm −2 , a Tafel slope of 80 mV dec −1 , and an exchange current density of 316 mA cm −2 in an alkaline solution, which approaches the top-tier activity among Bi-based HER electrocatalysts. Density-functional theory calculations confirm the preferred adsorption of H* onto Bi 2 O 3 as a function of oxygen chemical potential (∆ μ O ) and oxygen partial potential ( P O2 ) and reveal that high V o concentrations result in excessive stability of adsorbed hydrogen and hence the inferior HER activity. This study reveals the oxygen vacancy concentration-HER catalytic activity relationship and provides insights into activating catalytically inert materials into highly efficient electrocatalysts.
Location: Sri Lanka
No related grants have been discovered for Janith Sajitha Weerasinghe Adikaram Mudiyanselage.