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Effect of solvents on photonic crystallinity in graphene oxide dispersions
Ekanayaka, T.K.,Hong, S.H.,Shen, T.Z.,Song, J.K. Pergamon Press ; Elsevier Science Ltd 2017 Carbon Vol.123 No.-
<P>Structural color reflections from graphene oxide (GO) dispersions in binary mixtures of deionized water and organic solvents were obtained, and they were investigated at varying GO concentrations using three organic solvents: 1,4-dioxane, N-methyl-2-pyrrolidone (NMP), and dimethylformamide (DMF). Adding organic solvents in the aqueous GO dispersion changes the peak wavelength of the reflection spectrum and the purity of the reflection color, and in particular, the dependence of the peak wavelength on the GO concentration was more sensitive in the binary organic solvents than in pure water. This phenomenon can be explained by considering both the variations of the reflective index and the electrical screening effect in the binary solvents. However, only weak structural coloration based on the second order Bragg reflection was obtained in GO dispersions in pure DMF solvent, and even no structural coloration was observed in organic GO dispersions prepared using dried GO powder. These phenomena are related to the gelation at low concentration and the geometrical deformation of GO particles. Electrical switching of the structural color reflection was also demonstrated. (C) 2017 Elsevier Ltd. All rights reserved.</P>
Aryal, Krishna Prasad,Ekanayaka, Thilini K.,Gilbert, Simeon,Dowben, Peter A.,Jeong, Hae Kyung Elsevier 2020 Chemical physics letters Vol.738 No.-
<P><B>Abstract</B></P> <P>In the present study, carbon nanotube (CNT), thermally reduced graphite oxide (TRGO), and CNT-TRGO were functionalized with p-sulfonatocalix[4]arene (SC4) and then investigated for fluorescent detection of cholesterol in the presence of rhodamine 6G (R6G). All of the composite samples show effective quenching of R6G fluorescent intensity without cholesterol, but the fluorescence intensity significantly increases with the addition of cholesterol. The results indicate a strong interaction between SC4 composites and cholesterol rather than between the SC4 composites and R6G, increasing R6G fluorescence intensity in the presence of cholesterol due to the release of R6G from the SC4 composites. Formation of the complex, made of the SC4 composite plus the cholesterol, enables the detection of cholesterol in the wide range of cholesterol concentration up to 109 µM. The binding constant between SC4 and cholesterol has been calculated, indicating that the SC4 composites display the maximum binding constant of 1.9 × 10<SUP>4</SUP> M<SUP>−1</SUP> with cholesterol.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Demonstration of water soluble calixarene derivatives in the fluorescent detection. </LI> <LI> Successful functionalization of p-sulfonatocalix[4]arene (SC4) on carbon material. </LI> <LI> Fluorescent detection of cholesterol up to 109 μM. </LI> <LI> Maximum binding constant of 1.9 × 104 M<SUP>−1</SUP> between cholesterol and SC4 composites. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Tae-Hwan,Lee, Hyun-Cheol,Kim, Jae-Hoon,Hewawaduge, C. Y.,Chathuranga, Kiramage,Chathuranga, W. A. Gayan,Ekanayaka, Pathum,Wijerathne, H. M. S. M.,Kim, Chul-Joong,Kim, Eunhee,Lee, Jong-Soo Public Library of Science 2019 PLoS pathogens Vol.15 No.8
<P> Fas-associated factor 1 is a death-promoting protein that induces apoptosis by interacting with the Fas receptor. Until now, FAF1 was reported to interact potentially with diverse proteins and to function as a negative and/or positive regulator of several cellular possesses. However, the role of FAF1 in defense against bacterial infection remains unclear. Here, we show that FAF1 plays a pivotal role in activating NADPH oxidase in macrophages during <I>Listeria monocytogenes</I> infection. Upon infection by <I>L. monocytogenes,</I> FAF1 interacts with p67phox (an activator of the NADPH oxidase complex), thereby facilitating its stabilization and increasing the activity of NADPH oxidase. Consequently, knockdown or ectopic expression of FAF1 had a marked effect on production of ROS, proinflammatory cytokines, and antibacterial activity, in macrophages upon stimulation of TLR2 or after infection with <I>L. monocytogenes.</I> Consistent with this, FAF1<SUP>gt/gt</SUP> mice, which are knocked down in FAF1, showed weaker inflammatory responses than wild-type mice; these weaker responses led to increased replication of <I>L. monocytogenes.</I> Collectively, these findings suggest that FAF1 positively regulates NADPH oxidase-mediated ROS production and antibacterial defenses. </P>
Synthesis, Characterization and Antimicrobial Activity of Garcinol Capped Silver Nanoparticles
( H. N. Fernando ),( K. G. U. R. Kumarasinghe ),( T. D. C. P. Gunasekara ),( H. P. S. K. Wijekoon ),( E. M. A. K. Ekanayaka ),( S. P. Rajapaksha ),( S. S. N. Fernando ),( P. M. Jayaweera ) 한국미생물 · 생명공학회 2019 Journal of microbiology and biotechnology Vol.29 No.11
Garcinol, a well-known medicinal phytochemical, was extracted and isolated from the dried fruit rinds of Garcinia quaesita Pierre. In this study, garcinol has successfully used to reduce silver ions to silver in order to synthesize garcinol-capped silver nanoparticles (G-AgNPs). The formation and the structure of G-AgNPs were confirmed by UV-visible spectroscopy, transmission electron microscopy and Fourier transform infrared spectroscopy. The antimicrobial activity of garcinol and G-AgNPs were investigated by well diffusion assays, broth micro-dilution assays and time-kill kinetics studies against five microbial species, including Staphylococcus aureus (ATCC 25923), Pseudomonas aeruginosa (ATCC 27853), Escherichia coli (ATCC 25922), Candida albicans (ATCC 10231) and clinically isolated methicillin-resistant Staphylococcus aureus (MRSA). The formation of G-AgNPs is a promising novel approach to enhancing the biological activeness of silver nanoparticles, and to increase the water solubility of garcinol which creates a broad range of therapeutic applications.
Fungal diversity notes 603-708: taxonomic and phylogenetic notes on genera and species
Hyde, Kevin D.,Norphanphoun, Chada,Abreu, Vanessa P.,Bazzicalupo, Anna,Thilini Chethana, K. W.,Clericuzio, Marco,Dayarathne, Monika C.,Dissanayake, Asha J.,Ekanayaka, Anusha H.,He, Mao-Qiang,Hongsanan Springer Netherlands 2017 FUNGAL DIVERSITY Vol. No.
<P>We introduce the new basidiomycete species Agaricus purpurlesquameus, Agaricus rufusfibrillosus, Lactifluus holophyllus, Lactifluus luteolamellatus, Lactifluus pseudohygrophoroides, Russula benwooii, Russula hypofragilis, Russula obscurozelleri, Russula parapallens, Russula phoenicea, Russula pseudopelargonia, Russula pseudotsugarum, Russula rhodocephala, Russula salishensis, Steccherinum amapaense, Tephrocybella constrictospora, Tyromyces amazonicus and Tyromyces angulatus and provide updated trees to the genera. We also introduce Mortierella formicae in Mortierellales, Mucoromycota and provide an updated phylogenetic tree.</P>