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Gayathri Chandrasekaran,최수경,이영철,김근중,신현재 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Two types of carbon nanotubes (usually single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs)) have been intensively focused on academic researches and mass-produced for wide applications such as composite materials, biosensors, and drug delivery systems. However, due to oxidative stress-dependent and physically-induced cellular toxicity of CNTs, many efforts to render biocompatible and biodegradable properties in CNTs have been highlighted. Thus, taking into the consideration of exposure in human health and the environment, biodegradation of CNTs as a potential disposal is highly addressed. In this study, lignin peroxidase (LiP) was isolated and partially purified from the fruiting bodies of the edible mushroom Sparassis latifolia (S. latifolia). The biodegradation of raw grade and thermally-treated carboxylated SWCNTs (denoted as ASA and AST) with this enzyme was investigated, prior to more biodegradation-resistant MWCNTs. The interactions between the SWCNTs and LiP were investigated using various techniques, and the intermediate byproducts of the LiP degradation were identified. Our findings demonstrated that both ASA and AST were efficiently degraded by LiP where the producing radicals by the LiP played a critical role in the biodegradation of SWCNTs. The final degraded products were confirmed with the generation of CO2 gas. Conclusively, the low extraction cost of partially purified enzyme from mushrooms can make this approach a promising alternative in environmental bioremediation as a practical application.
Experiments and modeling of a vacuum membrane distillation for high saline water
Gayathri Naidu,최용준,정상현,황태문,Saravanamuthu Vigneswaran 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
A modified design vacuum membrane distillation (VMD) system with high saline water was evaluated using different operating conditions (sustainable low feed temperature and flow velocity). At high salinity, a permeate flux of 13.9 to 15.8 L m-2 h-1 was achieved. Increasing the salinity from 1 to 3 M NaCl reduced the permeate flux by 18–20%. An increase in bulk feed temperature (310.2–319.2 K) significantly increased the permeate flux by 64%. The increase in flow velocity (1.1 to 2.2 m s-1) in turn increased the permeate flux by 14–20%. Model fluxes predicted was a good fit to experimental fluxes (R2 ≥ 0.94).
Influence of Foreign Culture and Hybrid Culture
Gayathri Madubhani Ranathunga 한국복식학회 2013 International journal of costume and fashion Vol.13 No.2
Culture has played a pivotal role in fashion from time immemorial. The objective of this research is to explore the power of cultural affiliation in fashion. The selected study setting is the Kandyan Kingdom of Sri Lanka. The Kandyan Kingdom of Sri Lanka lasted almost 3 ½ centuries from 1474- 1815. The whole period faced different foreign cultural forces. As a result of such diverse cultural influences the Kandyan dress showed a hybrid formation of Western and South Indian and Sinhalese traditional sartorial features. Sewing techniques and unsewn dress arrangement methods were mixed together. The dress became an amazing blend of Eastern and Western dress items. They combined different aspects of foreign dress together to yield a unique result. The analysis comprises observational study of actual descriptions made by observer- participants, historical records, murals of the period review of ancient literature and research papers relevant to the subject. Reliability of the data was ensured. The pictorial data were cross checked from different literary sources. Many original sources were used. Results: Culture and fashion have strong interconnection. When features of culture change, trends of fashion are gradually correspondingly changed.
Gayathri Rajamanickam,S. L. Manju 한국고분자학회 2023 Macromolecular Research Vol.31 No.1
Niruriflavone (NF) a natural flavonoid isolated from Phyllanthus niruri Linn through bio-guided isolation, demonstrated significant neuroprotective efficacy by inhibiting oxidative stress, acetylcholinesterase, and 5-lipoxygenase which were beneficial for the treatment of Alzheimer’s disease (AD). It was further confirmed by in-vivo studies. Natural product usage in AD therapy has a lot of limitations. Nanotechnology addresses the challenges in natural product drug delivery for AD. Hence, the goal of this study was to develop an oral delivery system for the controlled release of niruriflavone. Also, the neuroprotective and antioxidant properties of niruriflavone-loaded chitosan nanoparticles (NFLC) were evaluated in aluminium chloride-induced AD rats. NFLC was prepared by the ionic gelation method and characterized by particle size, zeta potential, morphology, encapsulation efficacy, in vitro drug release kinetics, and stability. The particle size of synthesized NFLC was 192.3 nm with a zeta potential of + 20.7 mV and a polydispersity index of 0.509. The microcrystalline aggregate of nanoparticles and the rough surface was revealed by transmission and scanning electron microscopies. The cytotoxicity study of NFLC is conducted in neuroblastoma cell line SH-SY5Y which was evaluated by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay. NFLC was discovered to be biocompatible and cell viability by about 85%. It showed improved antioxidative enzyme levels and decreased oxidative products. The ability of NFLC to target the blood–brain barrier and treat AD will be validated with in-vivo studies.
Gayathri R.,V. Uma 한국통신학회 2018 ICT Express Vol.4 No.2
Knowledge Representation and Reasoning (KR & R) has become one of the promising fields of Artificial Intelligence. KR is dedicated towards representing information about the domain that can be utilized in path planning. Ontology based knowledge representation and reasoning techniques provide sophisticated knowledge about the environment for processing tasks or methods. Ontology helps in representing the knowledge about environment, events and actions that help in path planning and making robots more autonomous. Knowledge reasoning techniques can infer new conclusion and thus aids planning dynamically in a non-deterministic environment. In the initial sections, the representation of knowledge using ontology and the techniques for reasoning that could contribute in path planning are discussed in detail. In the following section, we also provide comparison of various planning domain modeling languages, ontology editors, planners and robot simulation tools.