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J.A. Morán Meza,J. Polesel-Maris,C. Lubin,F. Thoyer,A. Makky,A. Ouerghi,J. Cousty 한국물리학회 2015 Current Applied Physics Vol.15 No.9
Sharp Pt/Ir tips have been reproducibly etched by an electrochemical process using an inverse geometry of an electrochemical cell and a dedicated electronic device which allows us to control the applied voltages waveform and the intensity of the etching current. Conductive tips with a radius smaller than 10 nm were routinely produced as shown by field emission measurements through Fowler-Nordheim plots. These etched tips were then fixed on a quartz tuning fork force sensor working in a qPlus configuration to check their performances for both scanning tunneling microscopy (STM) and atomic force microscopy (AFM) imaging. Their sharpness and conductivity are evidenced by the resolution achieved in STM and AFM images obtained of epitaxial graphene on 6H-SiC(0001) surface. The structure of an epitaxial graphene layer thermally grown on the 6H-SiC(0001) (6 √3 × 6 √3 ) R30˚ reconstructed surface, was successfully imaged at room temperature with STM, dynamic STM and by frequency modulated AFM.
Hassan M. Faidallah,Sherif A. F. Rostom,Salem A. Basaif,Mohammed S. T. Makki,Khalid A. Khan 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.11
This study reports the synthesis of some novelisoxazolo[4,5-d]pyridazines and structurally related thiazolo[4,5-d]pyridazines, and their biological evaluation asantimicrobial agents. The proposed compounds weredesigned to contain pharmacophores such as urea, thiourea,sulfonylurea (thiourea) and some derived functionalities thatare believed to contribute to the anticipated biologicalactivities. The results revealed that 25 compounds displayedbroad spectrum of antibacterial activity, with greater inhibitoryeffect on the growth of the tested Gram positive strainscompared to Gram negative ones. Moreover, 14 compoundswere able to produce appreciable growth inhibitory activityagainst Candida albicans fungus when compared toClotrimazole. Most of the tested isoxazolo[4,5-d]pyridazinesdisplayed better antimicrobial profile than theircorresponding thiazolo[4,5-d]pyridazine congeners. Fourcompounds namely, p-(3,7-dimethyl-4-oxo-4H-isoxazolo[4,5-d]pyridazine-5-yl)benzenesulfonylthioureas (11c–d),3-substituted-2-[p-(3,7-dimethyl-4-oxo-4H-isoxazolo[4,5-d]pyridazine-5-yl)-benzene-sufonylimino]-4-oxothiazolidines(13d) and p-(2,7-dimethyl-4-oxo-4H-thiazolo[4,5-d]pyridazin-5-yl)benzenesulfonylthiourea (24c) werefound to be most active antimicrobial members in presentstudy.