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Md. Tariqul Islam,안순영,조수묵,윤해근 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.4
This study was conducted to investigate the efficacy of antibacterial compounds isolated from hairy vetch (Vicia villosa Roth) shoots against grapevine crown gall pathogen. The hairy vetch shoot powder was sequentially extracted and screened for antibacterial activity by the disc diffusion method. Ethyl acetate extract from the hairy vetch shoots was subjected to column chromatography on silica gel. The structures of the compounds were then elucidated by spectroscopic analysis and chromatographic assay. Three compounds were isolated and identified as bis (2-ethylhexyl)phthalate (compound 1), diethyl phthalate (compound 2), and p-hydroxybenzoic acid (compound 3). The compounds showed potential antibacterial effect as diameters of inhibition zones (7.3 ± 0.3 to 11.2 ± 0.4 mm) against Rhizobium vitis and Bacillus subtilis. The minimum inhibitory and minimum bactericidal concentrations of these compounds against the target bacteria were found to range from 62.5 to 125 and 125 to 250 μg·mL-1, respectively. The compounds also showed bactericidal activity based on the viable counts of the tested strain. These findings indicate that the isolated compounds could be used as possible candidates for control of crown gall disease in grapevines caused by R. vitis.
Mohammad Tariqul Islam,심재진,유바라즈할도라이,웬방호아,Muhammad Naoshad Islam,나춘섭 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
Poly(vinyl acetate) (PVAc) was synthesized by the atom transfer radical polymerization of vinyl acetate(VAc) in supercritical carbon dioxide using CuBr/2,2':6',2''-terpyridine complex as a catalyst and ethyl 2-bromoisobutyrateas an initiator. Polymerization proceeded in a controlled manner, and low to moderate conversion wasachieved within a reasonable time. The effects of the monomer amount, temperature, pressure, initiator, and ligandloading on monomer conversion, molecular weight and molecular weight distribution of the polymer were examined. The reaction kinetics was also investigated. The polymerization reaction was found to be first-order with respect to themonomer concentration. The molecular weights of the resulting PVAc increased linearly with increasing VAc conversion.
Self-assembly of a liquid crystal ABA triblock copolymer in a nematic liquid crystal solvent
Islam, Mohammad Tariqul,Kamal, Tahseen,Shin, Taegyu,Seong, Baekseok,Park, Soo-Young Elsevier 2014 Polymer Vol.55 No.16
<P><B>Abstract</B></P> <P>An ABA type triblock copolymer, consisting of liquid crystalline polymer (LCP, poly(4-cyanobiphenyl-4-oxyundecylacrylate)) ‘A’ end blocks and a deuterated polystyrene (dPS) ‘B’ mid block (LCP–dPS–LCP) was successfully synthesized by atom transfer radical polymerization (ATRP). The number average molecular weight (<I>M</I> <SUB>n</SUB>) of LCP–dPS–LCP was LCP (7.1 K)–dPS (19.4 K)–LCP (7.1 K) with a polydispersity index (PDI) of 1.41. LCP–dPS–LCP was self-assembled in a nematic liquid crystal solvent of 4-pentyl-4′-cyanobiphenyl (5CB) into spherical micelles with a LCP corona and a dPS core, in which dPS was folded to produce a V-shape structure. Micellar structures of LCP–dPS–LCP in 5CB were examined by small angle neutron scattering at various block copolymer concentrations and temperatures using a curve fitting method. The critical micelle concentration was 0.25 wt% and the self-assembled micelles dissociated into unimers at 33 °C, which is lower than the nematic to isotropic transition temperature (<I>T</I> <SUB>ni</SUB>) of 5CB (36 °C). The entropic penalty imposed on dPS by the ordered nematic state of the 5CB solvent caused phase separation of the flexible dPS block to form micelles, which vanished above the <I>T</I> <SUB>ni</SUB> of the 5CB solvent. Magnetic field-induced global orientation of 5CB revealed the structure of the dPS core of the micelle to be prolate (an elongated sphere) oriented with its long axis along the direction of the applied magnetic field.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Location Estimation in Distributed Ad-Hoc Wireless Sensor Networks
A.B.M Tariqul Islam,Imrul Hassan,AHM Razibul Islam,Ju Bin Song 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
The growth of wireless networking has generated commercial and research interest in statistical methods to track people and things. Inside stores, hospitals, warehouses and factories where Global Positioning System devices generally do not work. Indoor Positioning Systems aim to provide location estimates for wireless devices such as laptop computers, handheld devices and electronic badges. Therfore, in this paper, location estimation algorithms were suggested to address the global positiong problem in an ad-hoc wireless network and algorithms were compared to offer suitable solutions.