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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Chemical Society
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Korean Chemical Society
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Volume & Issues
Volume 52, Issue 6 - Dec 2008
Volume 52, Issue 5 - Oct 2008
Volume 52, Issue 4 - Aug 2008
Volume 52, Issue 3 - Jun 2008
Volume 52, Issue 2 - Apr 2008
Volume 52, Issue 1 - Feb 2008
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Kinetics of Catalytic Reactions Occurring in a Small Reaction Volume
Kim, Jung-Han ; Sung, Jae-Young ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 217~222
DOI : 10.5012/jkcs.2008.52.3.217
We investigate the kinetics of diffusion-influenced catalytic reactions occurring in small reaction volume. From a simple exact model study, we find that the reaction rate coefficient decreases with the size of reaction volume. The explicit expression for the average reaction rate constant is presented, which can be regarded as a generalization of well-known Collins-Kimball rate constant into the reactions occurring in a small reaction volume. It turns out that the traditional diffusion influenced reaction dynamics is followed by a single exponential relaxation phase with a rate constant dependent on the reaction volume for the catalytic reactions occurring in small reaction volumes.
A New Pseudoinverse Matrix Method For Balancing Chemical Equations And Their Stability
Risteski, Ice B. ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 223~238
DOI : 10.5012/jkcs.2008.52.3.223
this work is given a new pseudoniverse matrix method for balancing chemical equations. Here offered method is founded on virtue of the solution of a Diophantine matrix equation by using of a Moore-Penrose pseudoinverse matrix. The method has been tested on several typical chemical equations and found to be very successful for the all equations in our extensive balancing research. This method, which works successfully without any limitations, also has the capability to determine the feasibility of a new chemical reaction, and if it is feasible, then it will balance the equation. Chemical equations treated here possess atoms with fractional oxidation numbers. Also, in the present work are introduced necessary and sufficient criteria for stability of chemical equations over stability of their extended matrices.
The Study on the Rapid Screening of Schedule Chemicals in Aqueous Solution Using SPE-ACF
Park, Hoon ; Jung, Chang-Hee ; Lee, Yong-Han ; Hong, Dea-Sik ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 239~248
DOI : 10.5012/jkcs.2008.52.3.239
study of the solid phase extraction (SPE) technique using activated carbon fiber (ACF) as a sorbent was carried out on the schedule chemicals in water. 14 different schedule chemicals, which are the hydrolysis products and simulants of chemical agents such as alkylphosphonate, thiodiglycol etc. were selected for the study. Pyridine was used as a promoter to increase the derivatization efficiency, especially to improve silylation of 3-quinuclidinol. To improve the recovery efficiency of amines in the water solution, 1 mL of 5% Et3N/MeOH was introduced into SPE-ACF before the water sample loading. Throughout this study, the optimum condition was established to detect rapidly above chemicals in water.
Synthesis and Antibacterial Activity of New Tetrazole Derivatives
Mulwad, V.V. ; Pawar, Rupesh B ; Chaskar, Atul C ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 249~256
DOI : 10.5012/jkcs.2008.52.3.249
3-Acetyl/Formyl 4-hydroxy-2H(1)-benzopyran-2-one on treatment with malonitrile and ethyl cyanoacetate yielded 1,1-dicyano-2-[4/-hydroxy-2/H(1)-benzopyran-2/-one-3/-yl] ethene/propene 2a-h and ethyl-2-cyano-3-[4/-hydroxy-2/H (1)-benzopyran-2/-one-3/-yl] propenoate/butenoate 3a-h respectively. The 1,3 dipolar reaction of 2a-h with NaN3 gave the tetrazole derivative 4a-h. 3a-h on cyclization with PPA gave 3-cyano-2H,5H-pyrano [3, 2-c] benzopyran-2,5-diones 5a-h which on 1,3 dipolar reaction with NaN3 to gave 3-(1/H-tetrazol-5/-yl)-2H,5H-pyrano[3, 2-c] benzopyran-2,5-diones 6a-h. The structures of the compounds have been established on the basis of the spectral and analytical data. All the compounds were screened for their antimicrobial activities and have been found to exhibited significant antibacterial activities. Compounds 2h and 4h showed the activity 50g/mL.
Synthesis, Characterization and Bioevaluation of New Tetrahydroquinazolines
Murthy, Y.L.N. ; Acharyulu, P.V.N. ; Dubey, P.K. ; Sundari, T. Tirunala ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 257~265
DOI : 10.5012/jkcs.2008.52.3.257
The synthesis, characterization and bioevaluation of five new tetrahydroquinazolines was reported. Initially cyclohexanones were prepared and they were used as synthons to get the target molecules. These were condensed with substituted benzaldehydes and the resulting chalcones were treated with guanidine hydrochloride . All the molecules were non-toxic to human cells and showed significant antibacterial activity.
Preparation of Anionic Lipid Nanoparticles : Physical Properties and Stability
Lee, Jung-Eun ; Kim, Eun-Hye ; Lim, Deok-Hwi ; Jung, Suk-Hyun ; Jeong, Kyu-Sung ; Shin, Byung-Cheol ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 266~272
DOI : 10.5012/jkcs.2008.52.3.266
Detection of Mycobacterium Tuberculosis by Loop-Mediated Isothermal Amplification Assay
Ahn, Young-Chang ; Nam, Youn-Hyoung ; Park, Su-Min ; Cho, Min-Ho ; Seo, Jae-Won ; Yoon, Il-Kyu ; Park, Yong-Hyun ; Jang, Won-Cheoul ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 273~280
DOI : 10.5012/jkcs.2008.52.3.273
Mycobacterium tuberculosis (MTB) remains a major worldwide public health problem. In recent years, the incidence of MTB has been rising. Rapid and reliable diagnosis of Mycobacterium tuberculosis is essential to initiate correct treatment, avoid severe complications, and prevent transmission. LAMP was used to develop a rapid and sensitive laboratory diagnostic system for the MTB. In this research, the loop-mediated isothermal amplification method (LAMP) that amplifies DNA with high specificity and rapidity at an isothermal condition was evaluated for rapid detection of MTB. Undiluted DNA (2.10 × 106 copy/mL), 10-1, 10-2, 10-3, 10-4, 10-5 and 10-6 (copy/mL) of MTB DNA were amplified by PCR and LAMP to determine the sensitivity of the assay. At results, the LAMP assay reported here has the advantages of rapid amplification, high sensitivity, and high specificity and will be useful for rapid and reliable clinical diagnosis of MTB in hospital clinical laboratory.
Synergistic Effect of Azadirachta Indica Extract and Iodide Ions on the Corrosion Inhibition of Aluminium in Acid Media
Arab, S.T. ; Al-Turkustani, A.M. ; Al-Dhahiri, R.H. ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 281~294
DOI : 10.5012/jkcs.2008.52.3.281
synergistic action caused by iodide ions on the corrosion inhibition of aluminium (Al) in 0.5 M HCl in the presence of Azadirachta Indica (AZI) plant extract has been investigated using potintiodynamic polarization and impedance techniques. It is found that AZI extract inhibits the corrosion of aluminium in 0.5 M HCl. The inhibition efficiency increases with the increase in AZI extract concentration, until 24% v/v of AZI extract, then Inh.% is decreased with father increase in AZI extract concentration. The adsorption of this extract in the studied concentration is found to obey Frewendlish adsorption isotherm. The addition of iodide ions enhances the inhibition efficiency to a considerable extent. The increase in Inh.% values in presence of fixed concentration of iodide ions indicates that AZI extract forms an insoluble complex at lower AZI extract concentrations by undergoing a joint adsorption. But at higher concentrations of AZI extract, competitive adsorption is found between iodide ions and the formed complex leading to less Inh.%.The Inh.% decreased in presence of iodide ions with AZI extract than in presence of AZI extract alone at all studied iodide concentrations. The synergism parameter Sq is defined and calculated from surface coverage values. This parameter in the case of AZI extract is found to be more than unity, indicating that the enhanced inhibition efficiency caused by the addition of iodide ions.
Analysis of Selection Items Test for Selecting Scientifically Gifted Students in Chemistry Class
Choi, Chui-Im ; Jung, Min-Soo ; Hong, Hun-Gi ; Chae, Hee K ; Jeong, Dae-Hong ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 295~302
DOI : 10.5012/jkcs.2008.52.3.295
In this study, the test that were used in entrance examination for chemistry class in a Science-Gifted Education Center for middle school students were analyzed by using criteria for identification and measurement of scientific giftedness and a classical test theory. The result of analysis exhibited that most of problems measured more than two elements of scientific giftedness and required applications of scientific knowledge of middle school level to solve problems. In the analysis of sub-elements of scientific giftedness, originality, fluency in creativity and finding problems/formulating hypothesis, planning inquiry, interpreting data in science process skills were dominant while drawing conclusion and generalization processes were lacking. In correlation analysis between total score and each type of problems, total score was most influenced by the problems measuring science inquiry linked with scientific knowledge. Item difficulty is moderately high and item discrimination is moderate.
Analysis of Precipitate Formation Reaction for Measuring Chemical Reaction Rate and Its Development Appling Small-Scale Chemistry
Park, Kuk-Tae ; Noh, Ji-Hyun ; Kim, Dong-Jin ; Ryu, Ran-Yeong ; Noh, Yun-Mi ; Kim, Myo-Kyung ; Lee, Sang Kwon ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 303~314
DOI : 10.5012/jkcs.2008.52.3.303
The purpose of this study was to understand the experiment for measuring chemical reaction rate by precipitate formation and to develop experiments applying small-scale chemistry. For this study, the experimental method for measuring the effect of concentration and temperature on chemical reaction rates presented in the 10 high school science textbooks were classified by their experimental methods of confirming production. Subsequently, problems observed in carrying out the experiments for measuring chemical reaction rates by precipitate formation frequently presented in the 10 high school science textbooks were analyzed. Experiments applying small-scale chemistry were developed measuring chemical reaction rate by precipitate formation. According to the result of this study, there were some problems in the experimental method of precipitate formation for measuring chemical reaction rates presented in the high school science textbooks. Those problems in the science textbook experiments were insufficient specification of mixing methods of reaction solutions, obscurity of knowing when the character letter X disappeared, time delay in collecting the experimental data, formation of hazardous sulfur dioxide, uneasiness of fixing water bath container, controlling the reaction temperature, and low reproducibility. Those problems were solved by developing experiments applying smallscale chemistry. Presenting the procedure of mixing reaction solutions on the A4 reaction paper sheet made the experimental procedure clearly, using well plates and stem pipette shortened the reaction time and made it possible to continuously collect the experimental data. Furthermore, the quantity of hazardous sulfur dioxide was reduced 1/7 times and the time when the character letter X disappeared could be observed clearly. Since experiments for measuring the effect of concentration and temperature on chemical reaction rates could be performed in 30 minutes, the developing experiments applying SSC would help students understand the scientific concepts on the effect of concentration and temperature on chemical reaction rates with enough time for experimental data analysis and discussion.
Chemical Codes in Chemistry Posters
Han, Jae-Young ; Lee, Gi-Jong ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 315~321
DOI : 10.5012/jkcs.2008.52.3.315
The posters are the tools to communicate authors' idea with others by visual image and a little word. Every discipline has its own sign with specific meaning shared by the members of the discipline. Chemists and students learning chemistry, therefore, will communicate with each other by specific chemical signs (codes). The Korean Chemical Society has held the feast of drawing chemistry posters by students nationwide since 2004. In 2004 and 2005, more than three thousands of posters were submitted, and about one hundred and fifty posters were selected as the prize winners. The award was divided by the grade levels of elementary, middle, and high school. This study explores the codes of chemistry used in students' posters. With the analysis of the visual elements and the verbal elements of posters, 7 chemical codes were found such as the liquid, the experiment apparatus, the graduations, the chemical language, scientists, the earth and environment, and things around us. In addition, the differences were investigated on the grade levels, on awarded or non-awarded poster, and on the years. Educational implications of these findings are discussed.
Ab Initio Study of the Structure and Binding Energy of HOOCl-H
Kim, Young-Mi ; Sung, Eun-Mo ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 322~327
DOI : 10.5012/jkcs.2008.52.3.322
The geometrical structure, binding energy and vibrational frequencies of HOOCl-H2O cluster were investigated with MP2/6-311G(d,p) and MP2/6-311G(2d,2p) methods. The most stable conformer is skew HOOCl-H2O cluster and the binding energy was 46~48kJ/mol. The trans HOOCl-H2O cluster is less stable than skew form, but the binding energy is big enough to stablize the complex. The vibrational frequencies of skew and trans HOOCl-H2O cluster were calculated and compared with the spectrum of HOOCl.
Synthesis and Biological Evaluation of Some New2-propyl- 4(3H)-Quinazolinone Derivatives as Anti-bacteria
Eissa, A.M.F. ; El-metwally, A.M. ; El-hashash, M.A. ; El-gohary, A.M.F. ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 328~337
DOI : 10.5012/jkcs.2008.52.3.328
Diastereoselective Reduction of 1,3-Oxazolidin-2-ones and 1,3-Thiazolidin-2-ones
Sriharsha, Shimoga Nagaraj ; Shashikanth, Sheena ; Prasad, Beleyur Kamalakar Manu ; Murthy, Srinivas ;
Journal of the Korean Chemical Society, volume 52, issue 3, 2008, Pages 338~340
DOI : 10.5012/jkcs.2008.52.3.338