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Muniyandi Muneeswaran,김동훈,정번성,정중현,장재원,최병천 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.3
Single-phased [(1 − x) NBT-xBMO, x = 0.01 (NBTBM1), (1 − x) NBT-xBMO, x = 0.02 (NBTBM2), (1 − x) NBT-xBMO, x = 0.03 (NBTBM3), and (1 − x) NBT-xBMO, x = 0.04 (NBTBM4)] ceramic samples were prepared by using a solid-state method. X-ray diffraction analysis of the (1 − x) NBT-xBMO sample showed a rhombohedral structure and space group of R3c symmetry and confirmed the Rietveld refinement of the X-ray diffraction data. The micro-strain and the crystal sizes were calculated by using Williamson-Hall plots and experimentally verified with microstructural analyses. The in band-gap energy Eg varied from 3.28 to 3.17 eV for the (1 − x) NBT-xBMO ceramic samples. Furthermore, Raman spectra measured in the range from 100 to 1000 nm for the NBT-BMO powder samples showed new phonon modes and shifts to lower frequencies, which may be attributed to the incorporation of BMO into the NBT lattice.
Muniyandi, N. 한국부식방식학회 2003 Corrosion Science and Technology Vol.2 No.1
A comprehensive coverage of corrosion in batteries is rendered difficult by the wide choice of materials, environments and physical features as obtained in practical settings. Understanding of the complex processes that occur in these electrochemical systems gets clearer as new theoretical approaches backed by sophisticated analytical and characterization techniques continue to provide valuable insights which aid in controlling/mitigating wasteful corrosion reactions which affect battery shelf-life, cycle life, rate capability and capacity. In the light of the above, I limit myself to a discussion on corrosion aspects in representative system such as conventional Leclanche, lead-acid battery and magnesium batteries, and advanccd lithium systems.
Muniyandi Jeyaraj,Sangiliyandi Gurunathan,Senthilkumar Varadan,Kevin John Pulikotil Anthony,Muralidharan Murugan,Ashok Raja 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
Here, we describe biosynthesis of silver nanoparticles by reduction of aqueous Ag+ ions with the culture supernatant of Pseudomonas aeruginosa. The morphological, physiological, biochemical and molecular level identification of the strain GS1 resembles P. aeruginosa. The nanoparticles synthesized by P. aeruginosa were characterized by UV–vis spectroscopy, dynamic light scattering (DLS) and scanning electron microscopy (SEM). The size-distribution of nanoparticles was determined using a particle-size analyzer and the average particle-size was found to be 80 nm. The biological activities of the synthesized silver nanoparticles like antimicrobial activity were confirmed against Escherichia coli and Staphylococcus aureus and it have stable anti-coagulant effect.
Kasipandi Muniyandi,Gayathri Jagadeesan,Blassan P. George,Ashwini Lydia Manoharan,Gayathri Nataraj,Heidi Abrahamse,Parimelazhagan Thangaraj 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.13
A rich source of nutrients, figs have a number of clinically validated benefits. This study aimed to evaluate the in vitro simulated gastrointestinal digestion, and the antidiabetic and anticancer activity of Ficus microcarpa (FMP) and F. racemosa (FRP) fruits polysaccharides. The pre-digested FMP revealed higher sugar content (721 ± 14.81 mg glucose equivalents/g sample) than FRP. After in vitro digestion, isolated fruit polysaccharides showed effective uptake with over 80% sugar loss. Free radicals and enzymatic inhibition after gastric digestion have been significantly modified, demonstrating the effective absorption of FMP and FRP through the intestine. Conversely, after the continuous digestion, the nutritional content of the isolated polysaccharides was gradually decreased compared to the pre-digested sample. At 30 µg/mL concentration of FMP and FRP was inhibited by 50% of breast cancer cells. The present study reveals the potential uptake of FMP and FRP as nutritional supplements in the future.
Sankaralingam, Muniyandi,Jeon, So Hyun,Lee, Yong-Min,Seo, Mi Sook,Ohkubo, Kei,Fukuzumi, Shunichi,Nam, Wonwoo The Royal Society of Chemistry 2016 Dalton Transactions Vol.45 No.1
<P>A mixed-valent bis(mu-oxo)dimanganese(III,IV) complex, [(dpaq)Mn-III(O)(2)Mn-IV(dpaq)](+) (1), was prepared by reacting a hydroxomanganese(III) complex, [(dpaq)Mn-III(OH)](+), with hydrogen peroxide in the presence of triethylamine. The mixed-valent bis(mu-oxo)dimanganese(III,IV) complex (1) was well characterised by UV-vis, EPR and CSI-MS techniques. The electrophilic reactivity of 1 was investigated in the oxidation of 2,6-di- tert-butylphenol derivatives by 1, in which the relative rate afforded a good Hammett correlation with a rho value of -1.0. The nucleophilic character of 1 was then investigated in aldehyde deformylation reactions, using 2-phenylpropionaldehyde (2-PPA) and benzaldehyde derivatives as substrates. In contrast to the case of the reaction of 1 with 2,6-di-tert-butylphenol derivatives, a positive rho value of 0.89 was obtained in the Hammett plot, demonstrating that the bis(mu-oxo)-dimanganese(III,IV) complex is an active nucleophilic oxidant. Thus, 1 exhibited an amphoteric reactivity in both electrophilic and nucleophilic oxidative reactions.</P>
Singaravel, Muniyandi,Tomioka, Kenji Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Pigment-dispersing factor (PDF) is an octadecapeptide distributed in the optic lobe and the brain in a variety of insect species. There are lines of evidence suggesting possible involvement of PDF in the insect circadian system. However, its physiological roles in the circadian time keeping mechanism have not been clearly defined. In this study, we have examined the phase shifting effects of Gryllus-PDF on the circadian locomotor rhythm in the cricket Gryllus bimaculatus of which circadian clock is located in the optic lobe. Phase shifts in the circadian activity rhythm were measured following microinjection of 22nl of vehicle (Ringer's solution) or O.lmM PDF into the optic lobe through the compound eye at various circadian times. The results showed that PDF induced phase shifts of the circadian clock in a phase-dependent manner, suggesting that it may play a role as an input signal for the circadian clock.
Structural, vibrational and band gap tunability of lead-free (1 − x)NaBiTO3-xBiMnO3 ceramics
Muneeswaran, Muniyandi,Kim, Dong Hun,Jung, Beon Sung,Park, Sung Heum,Choi, Byung Chun,Jeong, Jung Hyun,Chang, Seo Hyoung Chapman and Hall 2017 Journal of materials science Materials in electron Vol. No.
<P>We report the band gap tunability of (1 - x)Na0.5Bi0.5TiO3-xBiMnO(3) (x = 0.00, 0.05, 0.10 and 0.15) ceramics by a solid-state reaction method. X-ray diffraction (XRD) analysis confirmed the phase formation of rhombohedral structure with the space group of R3c. Rietveld refinement of XRD data revealed that the structural symmetry as a function of x composition. Raman analysis exhibited the vibrational phonon frequencies associated with Bi-O, Na-O, and TiO6 octahedral vibrations. The realized band gap energy variations (3.35-2.53 eV) suggesting that the synthesized ceramics materials are promising for photovoltaic and photocatalytic applications.</P>
Amphoteric reactivity of metal–oxygen complexes in oxidation reactions
Sankaralingam, Muniyandi,Lee, Yong-Min,Nam, Wonwoo,Fukuzumi, Shunichi Elsevier Publishing Company 2018 Coordination chemistry reviews Vol.365 No.-
<P><B>Abstract</B></P> <P>Mononuclear metal–oxygen species, such as metal-superoxo, -peroxo, -hydroperoxo and -oxo complexes, are key intermediates involved in dioxygen activation and oxidation reactions catalyzed by a variety of metalloenzymes and their biomimetic compounds. Dioxygen is an electrophile or electron acceptor, but not a nucleophile or electron donor. However, when dioxygen is bound to metal complexes and metal–oxygen species are formed, such as metal-superoxo, -peroxo, -hydroperoxo, alkylperoxo, and -oxo complexes, the metal–oxygen intermediates react as nucleophiles and electron donors as well as electrophiles and electron acceptors. This review is intended to focus on such an amphoteric reactivity of the metal–oxygen complexes in electrophilic and nucleophilic reactions. Both the electronic and steric effects of the ligands have finely tuned the reactivity of metal–oxygen complexes in both the electrophilic and nucleophilic reactions. The amphoteric reactivity of metal–oxygen complexes can also be tuned by binding of redox-inactive metal ions acting as Lewis acids and also by binding of Brønsted acids.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electrophilic reactivity of metal–oxygen complexes. </LI> <LI> Nucleophilic reactivity of metal–oxygen complexes. </LI> <LI> Tuning the amphoteric reactivity of metal–oxygen complexes. </LI> <LI> Amphoteric reactivity of homo- and heterodinuclear bis(<I>μ</I>-oxo) complexes. </LI> </UL> </P>
Selective Oxygenation of Cyclohexene by Dioxygen via an Iron(V)-Oxo Complex-Autocatalyzed Reaction
Sankaralingam, Muniyandi,Lee, Yong-Min,Nam, Wonwoo,Fukuzumi, Shunichi ACS AMERICAN CHEMICAL SOCIETY 2017 Inorganic Chemistry Vol.56 No.9
<P>An iron complex with a tetraamido macrocyclic ligand, [(TAML)Fe-III](-), was found to be an efficient and selective catalyst for allylic oxidation of cyclohexene by dioxygen (O-2); cyclohex-2-enone was obtained as the major product along with cyclohexene oxide as the minor product. An iron(V)-oxo complex, [(TAML)Fe-V(O)](-), which was formed by activating O-2 in the presence of cyclohexene, initiated the autoxidation of cyclohexene with O-2 to produce cyclohexenyl hydroperoxide, which reacted with [(TAML)-Fe-III](-) to produce [(TAML)Fe-V(O)](-) by autocatalysis. Then, [(TAML)Fe-V(O)](-) reacted rapidly with [(TAML)-Fe-III](-) to produce a mu-oxo dimer, [(TAML)Fe-IV(O)Fe-IV(TAML)](2-), which was ultimately converted to [(TAML)Fe-V(O)](-) when [(TAML)Fe-III](-) was not present in the reaction solution. An induction period was observed in the autocatalytic production of [(TAML)Fe-V(O)](-). The induction period was shortened with increasing catalytic amounts of [(TAML)Fe-V(O)](-) and cyclohexenyl hydroperoxide, whereas the induction period was prolonged by adding catalytic amounts of a spin trapping reagent such as 5,5-dimethyl-1-pyrroline N-oxide (DMPO). The allylic oxidation of cycloalkenes was also found to depend on the allylic CH bond dissociation energies, suggesting that the hydrogen atom abstraction from the allylic CH bonds of cycloalkenes is the rate-determining radical chain initiation step. In this study, we have shown that an iron(III) complex with a tetraamido macrocyclic ligand is an efficient catalyst for the allylic oxidation of cyclohexene via an autocatalytic radical chain mechanism and that [(TAML)Fe-V(O)](-) acts as a reactive intermediate for the selective oxygenation of cyclohexene with O-2 to produce cyclohex-2-enone predominantly.</P>
Sankaralingam, Muniyandi,Lee, Yong-Min,Jeon, So Hyun,Seo, Mi Sook,Cho, Kyung-Bin,Nam, Wonwoo The Royal Society of Chemistry 2018 Chemical communications Vol.54 No.10
<P>We report the synthesis of manganese(iii)-peroxo (Mn<SUP>III</SUP>(O2)) and manganese(iii)-hydroperoxo (Mn<SUP>III</SUP>(O2H)) complexes by activating dioxygen (O2) and the amphoteric reactivity of the Mn(iii)-hydroperoxo complex in electrophilic and nucleophilic reactions.</P>