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Amide I IR probing of core and shell hydrogen-bond structures in reverse micelles
Lee, Jooyong,Jeon, Jonggu,Kim, Min-Seok,Lee, Hochan,Cho, Minhaeng International Union of Pure and Applied Chemistry 2014 Pure and Applied Chemistry Vol. No.
<P><B>Abstract</B></P><P>The properties of<I>N</I>-methylacetamide (NMA) molecules encapsulated in the reverse micelles (RMs) formed by anionic surfactant aerosol OT (AOT), are studied with vibrational spectroscopy and computation. Vibrational spectra of the amide I′ mode of the fully deuterated NMA-<I>d</I><SUB>7</SUB>show gradual increase of peak frequencies and line broadening as the size of RMs decreases. Analyses of the spectral features reveal the presence of three states of NMA-<I>d</I><SUB>7</SUB>that correspond to NMA located in the core of water phase (absorption frequency of 1606 cm<SUP>-1</SUP>) and two types of interfacial NMA near the surfactant layer (1620 and 1644 cm<SUP>-1</SUP>). In larger RMs with water content<I>w</I><SUB>0</SUB>= [D<SUB>2</SUB>O]/[AOT] ≥ 10, only the first two states are observed, whereas in smaller RMs, the population of the third state grows up to 25 % at<I>w</I><SUB>0</SUB>= 2. These results indicate the general validity of the two-state core/shell model for the confined aqueous solution of NMA, with small modifications due to the system-dependent solute-interface interaction. However, simulations of small RM systems with<I>w</I><SUB>0</SUB>≤ 15 show continuous variations of the population, frequency shifts, and the solute-solvent interaction strengths at solute-interface distance less than 4 Å. Thus, the distinction of solute core/shell states tends to be blurred in small RMs but is still effective in interpreting the average spectroscopic observables.</P>
Therapeutic Agents against Bacteria Causing Porcine Pneumonia
LEE, JOOYONG,LYOO, YOUNGSOO,PARK, DONGKI,JUNG, JHYLUN,LEE, CHUL-HOON,KIM, MINKYUN,LIM, YOONGHO 한국미생물 · 생명공학회 2001 Journal of microbiology and biotechnology Vol.11 No.6
In order to find therapeutic agents for porcine pneumonia, we screened for antibacterial activities of methanol extracts of 81 higher plants against four pathogenic microorganisms of Heamophilus parasuis, Pasteurella multocida, Actinobacillus pleuropneumonia, and Bordetella bronchiseptica, and found the bark of Cinnamomi cortex showed potent activities. Since this was inexpensive, we purified active compounds from it. The structures of the final active fractions were obtained through an activity-guided fractionation and their antibacterial activities are reported here.