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Novel fuzzy based model on analysis of invasiveness due to dispersal related traits of plants
HOW Peiris,S. Chakraverty,SSN Perera,SMW Ranwala 원광대학교 기초자연과학연구소 2017 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.13 No.3
Invasive Alien Species (IAS) can be considered as a serious threat to the existence of the biodiversity as they alter physical, chemical and biological components of the environment. Invasive potential of species can be recognized by their biological traits. Therefore, it is very important, if a model could be developed to measure the biological risk of plant species before introducing to a new environment. This work aims to incorporate dispersal related biological traits into a mathematical model to evaluate the risk of plant species. To build up the model, four factors of dispersal traits have been considered and grade of important weights of these traits towards invasiveness was assigned as explained in Chang's extent analysis and Buckly's methods (Column geometric mean method). The present model is found to be a better tracking system for identifying potential invaders compared to the conventional manually conducted risk assessment methods when incorporated with important weights as per Chang's extent analysis.
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TiO<sub>2</sub> Nanoparticles from Baker’s Yeast: A Potent Antimicrobial
( Mmk Peiris ),( Tdcp Guansekera ),( Pm Jayaweera ),( Ssn Fernando ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.10
Titanium dioxide (TiO<sub>2</sub>) has wide applications in food, cosmetics, pharmaceuticals and manufacturing due to its many properties such as photocatalytic activity and stability. In this study, the biosynthesis of TiO<sub>2</sub> nanoparticles (NPs) was achieved by using Baker’s yeast. TiO<sub>2</sub> NPs were characterized by X-ray Diffraction (XRD), UV-Visible spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Energy Dispersive X-ray analysis (EDX) studies. The XRD pattern confirmed the formation of pure anatase TiO<sub>2</sub> NPs. According to EDX data Ti, O, P and N were the key elements present in the sample. SEM and TEM revealed that the nanoparticles produced were spherical in shape with an average size of 6.7 ± 2.2 nm. The photocatalytic activity of TiO<sub>2</sub> NPs was studied by monitoring the degradation of methylene blue dye when treated with TiO<sub>2</sub> NPs. TiO<sub>2</sub> NPs were found to be highly photocatalytic comparable to commercially available 21 nm TiO<sub>2</sub> NPs. This study is the first report on antimicrobial study of yeast-mediated TiO<sub>2</sub> NPs synthesized using TiCl<sub>3</sub>. Antimicrobial activity of TiO<sub>2</sub> NPs was greater against selected Gram-positive bacteria and Candida albicans when compared to Gram-negative bacteria both in the presence or absence of sunlight exposure. TiO<sub>2</sub> NPs expressed a significant effect on microbial growth. The results indicate the significant physical properties and the impact of yeast-mediated TiO<sub>2</sub> NPs as a novel antimicrobial.
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