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Pharmacognostical Evaluation of Sphaeranthus indicus (Linn.)
Kirti. S. Prabhu,Richard Lobo,C. Dinesh Kumar,K. Rajendran,Annie Shirwaikar 한국생약학회 2006 Natural Product Sciences Vol.12 No.2
study presents a detailed pharmacognostical study of the underground portion of the crude drugSphaeranthus indicus dian system of medicine. The root and stolonwere studied using procedures of light, conofocal microscopy, WHO recommended-physicochemical determinations,and authentic phytochemical procedures. The physicochemical, morphological, and histological parameters presentedin this paper may be proposed as parameters to identify and establish the authenticity of S. indicus root and stolon.KeywordsS. indicus, pharmacognosy, adulterants
Defluoridation of Water by Graphene Oxide Supported Needle-Like Complex Adsorbents
Prabhu, S. M.,Elanchezhiyan, S. S.,Lee, G.,Meenakshi, S. Springer Science + Business Media 2016 Journal of inorganic and organometallic polymers a Vol.26 No.4
<P>The dicarboxylic acids like oxalic acid, malonic acid and succinic acid mediated graphene oxide-zirconium needle like complexes were synthesized and used to remove fluoride from simulated fluoride contaminated water. The adsorption of fluoride by dicarboxylic acids mediated graphene oxide-zirconium complexes were by both electrostatic interaction at acidic pH and ion-exchange mechanism at neutral pH. The maximum defluoridation capacity observed was 9.70 mg/g at the minimum contact time of 18 min at room temperature. Various batch equilibrium parameters like pH studies, contact time, common ion interference and temperature studies were optimized. The synthesized graphene oxide and graphene oxide supported complexes were characterized using UV-vis, FTIR, XRD and SEM with EDAX analysis to establish the mechanism of fluoride adsorption. The removal of fluoride was described by the pseudo-second-order reaction kinetics, Freundlich isotherm model and thermodynamic studies which indicates the nature of adsorption was endothermic and spontaneous. Regeneration studies depict that the dicarboxylic acid mediated graphene oxide-zirconium complex can be used as an effective adsorbent for the removal of fluoride ions from wastewater. Also, the field applicability of the material has been verified with field samples collected from nearby fluoride endemic villages.</P>
Prabhu, Shamit S.,Khan, Saad A.,Doudnikoff, Alexander L.,Reebye, Uday N. The Korean Dental Society of Anesthsiology 2019 Journal of Dental Anesthesia and Pain Medicine Vol.19 No.1
Myasthenia gravis (MG) is a neuromuscular autoimmune disorder which clinically presents as muscular weakness and fatigue due to autoantibody formation against acetylcholine receptors (AChR), leading to their subsequent destruction. Due to the neuromuscular implications of MG, certain considerations must be taken into account when providing anesthesia to MG patients. In the following case report, we have outlined procedural considerations for the anesthetic management of a patient with MG undergoing deep sedation for an elective oral surgery in an outpatient setting, as well as a discussion of relevant literature.
Prabhu, N.S.,Yun, H. Elsevier Science, Inc 2017 Journal of molecular graphics & modelling Vol.75 No.-
Photo-induced covalent crosslinking has emerged as the powerful strategy for analyzing and characterizing the protein-protein interaction and mapping protein 3D conformations. In the last decades, a number of photocrosslinking amino acids have been reported but only a few have been efficiently utilized for photocrosslinking purposes. Recently, incorporation of diazirine containing photoactivatable analogs such as photo-methionine, photo-leucine, photo-isoleucine and photo-lysine into target proteins were accomplished in live cells (Human A549cells, HEK 293) by depleting corresponding natural amino acid and supplementing these analogs in the medium. Likewise, incorporation of photo-methionine and photo-leucine is also reported in E. coli. Incorporation of these unnatural amino acids were demonstrated only in a limited number species, thereby conventional methods have been utilized for the protein-protein interaction study in other species. With this in mind, we studied in silico analysis of polyspecificity of four endogenous tRNA synthetases (LeuRS, IleRS, MetRS, and LysRS) from six different species such as Escherichia coli, Pseudomonas fluorescens, Corynebacterium glutamicum, Saccharomyces cerevisiae, Aspergillus oryzae and Homo sapiens towards its photocrosslinking amino acids. In addition, here we describe the active site similarity of different protein bio-factories. Based on the active site similarity and similar binding mode, we predicted that the endogenous tRNA synthetases of all the species are reactive to corresponding photoactivatable analogs. This is the first in silico study to demonstrate that the photocrosslinking unnatural amino acids are recognized by the endogenous tRNA synthetases of different protein expression biofactories.
Prabhu Srilakshmi,Bharadwaj Dhanya Y.,Bubbly S.G.,Gudennavar S.B. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.3
Over the last few years, lead-free inorganic metal perovskites have gained impressive ground in empowering satellites in space exploration owing to their material stability and performance evolution under extreme space environments. The present work has examined the versatility of eight such perovskites as space radiation shielding materials by computing their photon, charged particles and neutron interaction parameters. Photon interaction parameters were calculated for a wide energy range using PAGEX software. The ranges of heavy charged particles (H, He, C, N, O, Ne, Mg, Si and Fe ions) in these perovskites were estimated using SRIM software in the energy range 1 keVe10 GeV, and that of electrons was computed using ESTAR NIST software in the energy range 0.01 MeVe1 GeV. Further, the macroscopic fast neutron removal cross-sections were also calculated to estimate the neutron shielding efficiencies. The examined shielding parameters of the perovskites varied depending on the radiation type and energy. Among the selected perovskites, Cs2TiI6 and Ba2AgIO6 displayed superior photon attenuation properties. A 3.5 cm thick Ba2AgIO6-based shield could reduce the incident radiation intensity to half its initial value, a thickness even lesser than that of Pb-glass. Besides, CsSnBr3 and La0.8Ca0.2Ni0.5Ti0.5O3 displayed the highest and lowest range values, respectively, for all heavy charged particles. Ba2AgIO6 showed electron stopping power (on par with Kovar) better than that of other examined materials. Interestingly, La0.8Ca0.2Ni0.5Ti0.5O3 demonstrated neutron removal cross-section values greater than that of standard neutron shielding materials - aluminium and polyethylene. On the whole, the present study not only demonstrates the employment prospects of eco-friendly perovskites for shielding space radiations but also suggests future prospects for research in this direction
Graphene quantum dots synthesis and energy application: a review
S. Akash Prabhu,V. Kavithayeni,R. Suganthy,K. Geetha 한국탄소학회 2021 Carbon Letters Vol.31 No.1
Graphene Quantum Dots (GQDs), zero-dimensional nanoparticles which are derived from carbon-based sources owned the new pavement for the energy storage applications. With the varying synthesis routes, the in-built properties of GQDs are enhanced in different categories like quantum efficiency, nominal size range, and irradiation wavelength which could be applied for the several of energy and optoelectronics applications. GQDs are especially applicable in the specific energy storage devices such as super capacitors, solar cells, and lithium-ion batteries which were demonstrated in this work. This paper critically reviews about the synthesis techniques used for the GQDs involving energy storage applications with increased capacitance, energy conversion, retention capability, and stability.
Deepa Kandaswamy,MuthuKumar M,Mathew Alexander,Krishna Prabhu,Mahasampath Gowri S,Srinivasa Babu Krothapalli 대한파킨슨병및이상운동질환학회 2018 Journal Of Movement Disorders Vol.11 No.1
Objective Motor impairments related to hand function are common symptoms in patients with movement disorders, such as Parkinson’s disease (PD) and focal hand dystonia (FHD). However, hand dysfunction has not been quantitatively assessed as a clinical tool for screening patient groups from healthy controls (HCs). The aim of our study was 1) to quantitatively assess hand dysfunction in patients with PD and FHD and its usefulness as a screening tool 2) to grade disease severity in PD and FHD based on hand dysfunction. Methods The current case-control study included HCs (n = 50) and patients with known history of PD (n = 25) or FHD (n = 16). Hand function was assessed by a precision grip task while participants lifted objects of 1.3 N and 1.7 N under dry skin conditions, followed by very wet skin conditions (VWSCs). Receiver operating characteristic and summative scoring analyses were performed. Results In PD, the combination of loading phase duration and lifting phase duration at quantitative cutoffs of 0.36 and 0.74 seconds identified 21/25 patients as diseased and 49/50 subjects as HCs with 1.7 N under VWSCs. In PD, 5/21 was graded as “mild” and 16/21 as “moderate cases.” In FHD, slip force at a cutoff of 1.2 N identified 13/16 patients as diseased and 41/50 subjects as HC with 1.7 N under VWSCs, but disease severity could not be graded. Conclusion Our results demonstrate the use of precision grip task as an important clinical tool in assessment of hand dysfunction in movement disorder patients. Use of quantitative cutoffs may improve diagnostic accuracy and serve as a valuable adjunct to existing clinical assessment methods.
A Mathematical Model Development of Automotive 42-Volt Battery System and a Starter-Generator
N.S. ANDRES,M.RAM PRABHU,Y.G. Eom,B.C. JANG 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
The proposed mathematical model of the starter-generator system incorporates the motor speed, battery voltage and the desired current to estimate the moment generation capabilities of the starter-generator and the actual current of the battery system. The fundamentals for this mathematical modeling are the simulated results of the experimental data. These pertinent data are used in establishing the governing equations for the determination of motor moments, actual battery currents and efficiencies of the system's operation at different loading characteristics and speed regions. The derived equations are projected to incorporate into simulation programs which can be used in further study of the system's operations.