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Insecticidal activity of Origanum majorana L. essential oil as anti-cholinergic agent
Prabu Sivaprasath,Jing Dapeng,Chandran Viswanathan,Mathew Preethy 한국곤충학회 2020 Entomological Research Vol.50 No.8
The present study was focused on exploring the presence of active compounds in Origanum majorana essential oil (OmEO), and its various knock-down effects against the rice moth, Corcyra cephalonica. GC–MS analysis detected the existence of major compounds such as monoterpenes, cis-β-terpineol and terpinen-4-ol with the total proportion of 52.16%. Fumigant toxicity against adult and larvae was calculated with an LC50 value of 11.31 and 49.83 μL/L air, respectively. The contact toxicity against adult, pupa, larvae and eggs was observed with LC50 value 2.54, 0.95, 2.78, and 0.49 μL/L, respectively. Furthermore, the influential repellent behavior against adults has been observed. Acetylesterase (AChE) inhibition activity of OmEO was observed against adult and larvae of C. cephalonica with an IC50 value of 35.89 and 118.54 μL/mL, respectively. Moreover, computational docking study revealed the binding affinity of Cis-β-terpineol and terpinen-4-ol towards the active binding sites of AChE. On the other hand, Fluorescence-assisted cytometry and comet assay confirmed the cytotoxic and genotoxic effect of OmEO at various concentrations on C. cephalonica. Altogether, the results showed the knock-down effect of OmEO against C. cephalonica, and it could be a potential biocontrol measure against the stored product pest.
Prabu, M.,Ketpang, K.,Shanmugam, S. Royal Society of Chemistry 2014 Nanoscale Vol.6 No.6
A nickel-doped cobalt oxide spinel structure is a promising non-precious metal electrocatalyst for oxygen evolution and oxygen reduction in rechargeable metal-air batteries and water electrolyzers operating with alkaline electrolytes. One dimensional NiCo2O4 (NCO) nanostructures were prepared by using a simple electrospinning technique with two different metal precursors (metal nitrate/PAN and metal acetylacetonate/PAN). The effect of precursor concentration on the morphologies was investigated. Single-phase, NCO with an average diameter of 100 nm, porous interconnected fibrous morphology was revealed by FESEM and FETEM analysis. The hierarchical nanostructured 1D-spinel NiCo2O4 materials showed a remarkable electrocatalytic activity towards oxygen reduction and evolution in an aqueous alkaline medium. The extraordinary bi-functional catalytic activity towards both ORR and OER was observed by the low over potential (0.84 V), which is better than that of noble metal catalysts [Pt/C (1.16 V), Ru/C (1.01 V) and Ir/C (0.92 V)], making them promising cathode materials for metal-air batteries. Furthermore, the rechargeable zinc-air battery with NCO-A(1) as a bifunctional electrocatalyst displays high activity and stability during battery discharge, charge, and cycling processes.
Prabu, Ponraj Ganesh,Sabhanayakam, Selvi,Mathivanan, Veeranarayanan,Balasundaram, Dhananjayan Korean Society of Sericultural Science 2011 International Journal of Industrial Entomology Vol.22 No.2
To evaluate the growth rate of larval and pupal parameters of silkworm Bombyx mori fed with Silver Nanoparticles (AgNps) treated $MR_2$ mulberry leaves, the following works have been considered. The AgNp was synthesized by chemical reduction method, it was diluted by different concentrations such as 25%, 50%, 75% and 100% (without dilution). Fresh mulberry leaves (Morus alba L.) were sprayed by each concentration and were fed to silkworms, from $3^{rd}$, $4^{th}$ and $5^{th}$ instar, five feedings/day. Group $T_1$ larvae received $MR_2$ mulberry leaves sprayed with distilled water and served as control, group $T_2$, $T_3$, $T_4$ and $T_5$ larvae received 25%, 50%, 75% and 100% AgNps sprayed mulberry leaves, respectively. Silkworm larvae fed on M. alba ($MR_2$) leaves sprayed with 25% concentration of AgNps (group $T_2$) was significantly increased the larvae and cocoon length, width and weight as compared to those fed on control (group $T_1$) $MR_2$ mulberry leaves and other groups ($T_3$, $T_4$ and $T_5$). Hence, 25% AgNps dose was fixed as an effective dose. It has been observed from the present study that 25% AgNps treated (group $T_2$) leaves fed by silkworms have enhanced the larval and pupal growth and quantity of silk production than control.
Prabu, D.,Kirubanandan, S.,Ponnudurai, K.,Nappinnai, M.,Jinu, Alin J.S.,Renganathan, S. Kyung Hee Oriental Medicine Research Center 2008 Oriental pharmacy and experimental medicine Vol.8 No.4
Ayurveda, an ancient System of Indian Medicine, has recommended a number of drugs from indigenous plant sources for the treatment of inflammation. To evaluate the anti-inflammatory and analgesic activities of methanol extract of Triphala were investigated in Wister albino rats and mice. The methanol extract of Triphala were found to encompass substantial anti-inflammatory effect in acute and sub-acute models and analgesic effect. Animal models of carrageenan induced edema and cotton pellet induced granuloma in albino rats were used. Extract of 200 mg/kg shows significantly reduced paw edema. Analgesics activity of Triphala with 200 mg/kg shown by significant reduction of writhing. These report shows to support the use methanol extract of Triphala in relieving inflammation and pain.
Antimicrobial Drug Release Scaffolds of Natural and Synthetic Biodegradable Polymers
Prabu, Periasamy,Kim, Kwan-Woo,Dharmaraj, Nallusamy,Park, Jong-Hoon,Khil, Myung-Seob,Kim, Hak-Yong The Polymer Society of Korea 2008 Macromolecular Research Vol.16 No.4
A series of biodegradable polymeric scaffolds was prepared by using a combination of natural (collagen) and synthetic (poly(caprolactone)) (PCL) polymers in various compositions. These scaffolds were soft, spongy, porous and transparent in nature and were characterized by thermogravimetric analysis (TGA) and Fourier transform infrared (FT-IR) spectroscopy. The entrapment efficiency and drug release activity of the scaffolds were analyzed using penicillin and tetracycline as antimicrobial drugs. The drug release activity of the scaffolds with various combinations of collagen and PCL were studied by measuring the optical density in a spectrophotometer at the following time intervals: 1,4, 24, 48 and 60 h. These scaffolds showed better and continuous drug release for up to 60 h. Even after such a long duration, a portion of the drug remained entrapped in the scaffolds, indicating that they can be utilized for wound healing applications.
Prabu, Moni,Ramakrishnan, Prakash,Nara, Hiroki,Momma, Toshiyuki,Osaka, Tetsuya,Shanmugam, Sangaraju American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.19
<P>Nitrogen-doped/undoped thermally reduced graphene oxide (N-rGO) decorated with CoMn<SUB>2</SUB>O<SUB>4</SUB> (CMO) nanoparticles were synthesized using a simple one-step hydrothermal method. The activity and stability of this hybrid catalyst were evaluated by preparing air electrodes with both primary and rechargeable zinc–air batteries that consume ambient air. Further, we investigated the relationship between the physical properties and the electrochemical results for hybrid electrodes at various cycles using X-ray diffraction, scanning electron microscopy, galvanodynamic charge–discharging and electrochemical impedance spectroscopy. The structural, morphological and electrocatalytic performances confirm that CMO/N-rGO is a promising material for safe, reliable, and long-lasting air cathodes for both primary and rechargeable zinc–air batteries that consume air under ambient condition.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-19/am5047476/production/images/medium/am-2014-047476_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5047476'>ACS Electronic Supporting Info</A></P>
Prabu, R.,Vijayaraj, A.,Suresh, R.,Jagadish, L.,Kaviyarasan, V.,Narayanan, V. Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.5
Six new binuclear copper(II) complexes have been prepared by template condensation of the dialdehydes 1,8-[bis(3-formyl-2-hydroxy-5-methyl)benzyl]-l,4,8,11-tetraazacyclotetradecane (PC-a) and 1,8-[bis(3-formyl-2-hydroxy-5-bromo)benzyl]-l,4,8,11-tetraazacyclotetradecane (PC-b) with appropriate aliphatic diamines, and copper(II) perchlorate. The structural features of the complexes have been confirmed by elemental analysis, IR, UV-vis and mass spectra etc. The electrochemical behavior of all the copper(II) complexes show two irreversible one electron reduction process. The room temperature magnetic moment studies depict the presence of an antiferromagnetic interaction in the binuclear complexes. The catechol oxidation and hydrolysis of 4-nitrophenylphosphate were carried out by using the complexes as catalyst. The antimicrobial screening data show good results. The binding of the complexes to calf thymus DNA (CT DNA) has been investigated with absorption and emission spectroscopy. The complex [$Cu_2L^{1a}$] displays significant cleavage property of circular plasmid pBR322 DNA in to linear form. Spectral, electrochemical, magnetic and catalytic studies support the distortion of the copper ion geometry that arises as the macrocyclic ring size increases.
Prabu Ravindran,Kumarappan Mani Kumar,Selvam Rangasamy,Kuttynadar Rajammal Vijaya Kumar 한국고분자학회 2022 폴리머 Vol.46 No.4
In the present study, the ballistic impact resistance of kevlar reinforced polymer composites and shape memoryalloy sheet reinforced kevlar epoxy polymer composites have been compared numerically and experimentally. The testspecimens have been fabricated by the hand layup method, and the ballistic impact test has been conducted accordingto NIJ Level IIIA. In the current research, a new method has been proposed to measure the ballistic impact resistanceof the material by using Image J software. From the test results, it has been observed that reinforcement of shape memoryalloy in kevlar epoxy polymer composites has increased the ballistic impact resistance by 89-145% for the damaged areacompared with plain kevlar reinforced epoxy polymer composite. Also, the damaged area observed in the numerical andthe experimental results is almost the same.