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Helicobactericidal Activity of Cissus quadrangularis L. Variant I
Anoop Austin,Jegadeesan. M.,Gowrishankar. R. 한국생약학회 2004 Natural Product Sciences Vol.10 No.5
Cissus quadrangularis L. variant I (Family: Vitaceae), the common variant with square stem is widely used for peptic ulcer disorders (PUD) in traditional medicine. Aerial parts were collected during flowering and vegetative seasons and analysed. Aqueous (hot and cold) and solvent extracts (acetone, chloroform and ethanol) were screened for their anti-Helicobacter pylori (Hp) activities. Among them chloroform extract was observed to recover bioactive principles markedly with low minimal inhibitory concentration (MIC) and minimal lethal concentration (MLC). MIC was 30 μg in both samples and MLC was 35 μg for vegetative and 30 μg for flowering seasons, respectively. Extracts from samples collected during flowering season were better than thse of vegetative season.
Kim, Min-Hye,Suh, Myungkoo,Gowrishankar, Vignesh,McGehee, Michael D,Kwon, Young-Uk American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.1
<P>We studied the properties of regioregular P3HT conducting polymers with three different molecular weights infiltrated into the pores of mesoporous titania thin films. The titania thin films, prepared by self-organization of titania species with a non-ionic triblock copolymer F127 followed by calcination to remove organics, have arrays of 7 nm vertical nanochannels. The UV-Vis spectra of the P3HT-titania nanocomposite films revealed that the interstrand interactions between P3HT chains were weakened by the infiltration. Such an effect increases as the molecular weight of P3HT increases and as the infiltration temperature increases. Consequently, the efficiency of the solar cells, assembled by using the P3HT infiltrated mesoporous titania thin films, was the highest with the smallest P3HT, contrary to the generally accepted practice of using high molecular weight P3HT for forming bulk heterojunction solar cells.</P>
Meenakshi Sundaram Sri Abirami Saraswathi,Dipak Rana,Subbiah Alwarappan,Shanmugaraj Gowrishankar,Prabu Vijayakumar,Alagumalai Nagendran 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
Poly (ether imide) [PEI] ultrafiltration membranes are coated by polydopamine (PD) and immobilizedwith silver nanoparticles (AgNPs) to improve the permeation, contaminant separation and anti-foulingproperties. The tailored membranes displayed enhanced permeability (97.2 Lm 2 h 1), hydraulicresistance (13.8 kPa/Lm 2 h 1), average roughness (43 nm), contaminant rejection (>97%) with a higherflux recovery ratio (>95%). PEI/PD/Ag membranes showed anti-biofouling property against gramnegative and gram positive bacteria and facilitated the separation of toxic contaminants. The outstandingstability of PD coating and the presence of AgNPs offer effective and safe water separation.
Study on effect of welding speed on friction stir welded aluminium metal matrix hybrid composite
P. Gopi Krishnan,B. Suresh Babu,S. Madhu,S. J. Gowrishankar,C. Bibin,S. Saran,S. Shree Ram,A. R. Sri Hari,S.Vidyasagar 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.5
The development of aluminum series matrix hybrid composites with ceramic reinforcements has recently caught the interestof new researchers. The addition of more than one or two reinforcements in aluminium alloy leads to the fabrication of theAluminium Metal Matrix Hybrid Composite (AMMHC). The present investigation is aimed at the development of newlydeveloped AMMHC followed by friction stir welding for obtaining the improved mechanical properties. The stir castedAA6063 with reinforcement of 5%, 10% and 15% wt. Silicon Carbide (SiC) and 10% wt. Boron Carbide (B4C) werefabricated by stir casting technique and the AMMHC with 10% each of SiC and B4C showed higher mechanical properties. Further the AMMHC are joined by friction stir welding (FSW) route. A prime experimental work has been tried out in theFSW process by varying welding speed (20, 30, 40, 50 and 60 mm/min). The effect of welding speed on AMMHCs were studiedon macro and microstructural observations followed by micro hardness and ultimate tensile. Strength, in which 40 mm/minof welding speed gives better properties than other processing condition. The weldment reveals the better joint strength withthe presence of fine particle dispersion in the microstructure.