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Muniyappan Rajiv Gandhi,Manabu Yamada,Yoshihiko Kondo,Atsushi Shibayama,Fumio Hamada 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
p-Sulfonatothiacalix[6]arene was impregnated onto commercial polymeric resins. The platinum groupmetals sorption experiments were carried and maximum PGM sorption was observed at pH 4 in 180 min. The 1-loaded IRA-400, IRA-411, and XAD-7 showed Pd SCs of 279, 265, and 135 mg/g, respectively. ThePGM SCs of 1-loaded IRA-400, IRA-411 are found to be Pd > Pt > Rh. All the impregnated resins followedFreundlich isotherm and Pd sorption was exothermic. The kinetic studies demonstrate that Pd sorptionfollows pseudo-second order and intraparticle diffusion models. 1-Loaded XAD-7 selectively adsorbs ofPd ions from an automotive catalyst residue leached solution.
Muniyappan, Srinivasan,Kim, Jin Hae Korean Magnetic Resonance Society 2019 Journal of the Korean Magnetic Resonance Society Vol.23 No.1
${\alpha}B$-crystallin (${\alpha}BC$) is a member of a small heat-shock protein (sHSP) superfamily and plays a predominant role in cellular protein homeostasis network by rescuing misfolded proteins from irreversible aggregation. ${\alpha}BC$ assembles into dynamic and polydisperse high molecular weight complexes containing 12 to 48 monomers; this variable stereochemistry of ${\alpha}BC$ has been linked to quaternary subunit exchange and its chaperone activity. The chaperone activity of ${\alpha}BC$ poses great potential as therapeutic agents for various neurodegenerative diseases. In this mini-review, we briefly outline the recent advancement in structural characterization of ${\alpha}BCs$ and its potential role to inhibit protein misfolding and aggregation in various human diseases. In particular, nuclear magnetic resonance (NMR) spectroscopy and its complimentary techniques have contributed much to elucidate highly-dynamic nature of ${\alpha}BCs$, among which notable advancements are discussed in detail. We highlight the importance of resolving the structural details of various ${\alpha}BC$ oligomers, their quaternary dynamics, and structural heterogeneity.
Madesh Muniyappan,Sureshkumar Shanmugam,In Ho Kim 한국축산학회 2024 한국축산학회지 Vol.66 No.1
This study investigated the impact of clay mineral ‘illite’ (IL) on the growth performance, apparent total tract digestibility, and meat-carcass grade quality in growing-finishing pigs. One hundred fifty pigs were divided into two groups with fifteen pens/group and five pigs/pen, a control group that was fed with a corn-soybean meal-based diet and IL treated group were fed a meal-based diet supplemented with 0.5% IL. Compared to the control, IL supplementation increased average daily feed intake (ADFI) and reduce gain to feed ratio (G:F) in the pigs during days 43 to 70 and 99 to 126 and increased dry matter during days 42 and 126, and backfat thickness on day 98 (p < 0.05). The drip loss was reduced on day 7, meat firmness tended to increase with dietary IL supplementation. In summary, dietary 0.5% IL supplementation improved ADFI, nutrient utilization of dry matter, and firmness and reduced G:F and drip loss of growing-finishing pigs.
A Kinetic Study on the Oxidation of Indole by Peroxomonosulphate in Acetonitrile Solvent
Kavery, Muniyappan,Govindasamy, Chandramohan,Johnson, Stephen Korean Chemical Society 2013 대한화학회지 Vol.57 No.2
Kinetics of oxidation of indole by peroxomonosulphate (PMS) in aqueous acetonitrile medium has been investigated. The reaction follows a total second order, first order each with respect to [Indole] and [PMS]. The rate of the reaction was not affected by added [$H^+$]. Variation of ionic strength (${\mu}$) had no influence on the rate. Increase of percentage of acetonitrile decreased the rate. Absen ce of any polymerization indicated a nonradical pathway. Activation and thermodynamic parameters have bee n computed. A suitable kinetic scheme based on these observations is proposed. The reactivity of PMS towards Indole was found to be higher than that with peroxodisulphate.
Srinivasan Muniyappan,Seong Ok Kim,Hyotcherl Ihee 한국구조생물학회 2015 Biodesign Vol.3 No.2
Protein structure determination at the atomic level is an essential step for understanding protein functions and developing new drugs. However, growing crystals of sufficient quality and size necessary to obtain good diffraction patterns is a significant bottleneck. The advent of X-ray free electron lasers (XFELs) has made it possible to collect high quality X-ray diffraction patterns from nano- or micro-sized crystals because a typical XFEL pulse is intense enough to provide a diffraction pattern from such small sized crystals and is temporally short (less than 50 femtoseconds) enough to collect the diffraction pattern prior to crystal destruction or significant radiation damage. A combination of this idea and a continuous sample delivery system supplying a fresh crystal for every X-ray pulse provides a nascent field of serial femtosecond crystallography (SFX). The concept of serial crystallography (SX) is also being adapted in conventional micro- and nanofocused synchrotron beamlines, resulting in serial synchrotron crystallography (SSX). In this review, we survey and examine a variety of currently available sample delivery systems in SFX and SSX and discuss their advantages and drawbacks. We also review the protein systems studied by SFX and SSX and various protein crystallization techniques that are particularly useful for membrane proteins in the application with SFX and SSX. Finally, we highlight the applicability of the SFX and SSX methods for time-resolved studies, which offer notable new possibilities for tracking both the reversible and irreversible structural dynamics of proteins at the atomic level in real time. SSX and SFX may revolutionize the field of structural biology.
Srinivasan Muniyappan,김진해 한국자기공명학회 2019 Journal of the Korean Magnetic Resonance Society Vol.23 No.1
αB-crystallin (αBC) is a member of a small heat-shock protein (sHSP) superfamily and plays a predominant role in cellular protein homeostasis network by rescuing misfolded proteins from irreversible aggregation. αBC assembles into dynamic and polydisperse high molecular weight complexes containing 12 to 48 monomers; this variable stereochemistry of αBC has been linked to quaternary subunit exchange and its chaperone activity. The chaperone activity of αBC poses great potential as therapeutic agents for various neurodegenerative diseases. In this mini-review, we briefly outline the recent advancement in structural characterization of αBCs and its potential role to inhibit protein misfolding and aggregation in various human diseases. In particular, nuclear magnetic resonance (NMR) spectroscopy and its complimentary techniques have contributed much to elucidate highly-dynamic nature of αBCs, among which notable advancements are discussed in detail. We highlight the importance of resolving the structural details of various αBC oligomers, their quaternary dynamics, and structural heterogeneity.
Madesh Muniyappan,김인호 충남대학교 농업과학연구소 2023 Korean Journal of Agricultural Science Vol.50 No.2
A total of 16 sows (average parity = 3.5 ± 0.10, standard deviation = 2.05) and their newborn pigs (Duroc × [Landrace × Yorkshire], initial body weight 1.53 ± 0.07 kg) were used in a 21-day study. On day 3 of age, piglets along with their dam were divided into two groups: CON and TRT. CON group piglets did not receive any iron injection while, TRT group piglets received 200 mg of injectable iron (GleptoForte) in a single dose. The administration of iron at day-3 of birth improved weaning body weight and overall average daily gain in sucking piglets compared with their control counterparts. For blood criteria, injection of 200 mg of iron improved serum iron values and hematocrit and decreased total iron binding capacity (TIBC) during the day 21 period. In summary, 200 mg iron injection at birth resulted in greater growth performance and blood iron status. These results indicate that providing 200 mg of injectable iron is sufficient to optimize the growth performance and blood iron status of suckling piglets.