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Effect of Salinity on Lignin and Hydroxycinnamic Acid Contents in Rice
위승곤,이명철,정병엽,김재성,김진홍,백명화,양대화 한국작물학회 2004 Korean journal of crop science Vol.49 No.6
The lignin contents between IR-29 and Pokkali were not significantly different in the absence of NaCl, but they were slightly increased at 40 mM NaCl. Although lignin contents were not relatively significantly different between salt treated and control plants, the total yields of alkaline nitrobenzene oxidation ranged from 17.4 - 20.0 mg/g of cell wall residue at 40 mM NaCl were significantly different compared with control plants (11.8 - 12.2 mg/g). The total amounts of ester-linked hydroxycinnamic acids in IR-29 were decreased from 14.5 to 9.9 mg/g, while Pokkali is almost same levels (14.9 - 15.0 mg/g) under treated and control with 40 mM NaCl. In contrast, the total amounts of ether-linked hydroxycinnamic acids were increased from 9.4 to 13.9 mg/g together with an opposite trend in Pokkali as a decrease 10.9 to 8.8 mg/g under treated and control with 40 mM NaCl. These results revealed that IR-29 is more sensitive in response to 40 mM NaCl in terms of hydroxycinnamic acids than Pokkali.
볏짚 섬유소의 반추미생물 Ruminococcus albus F-40 에 의한 분해양태에 관한 연구
김윤수,위승곤,최봉환,명규호 한국축산학회 1997 한국축산학회지 Vol.39 No.5
Chemical and ultrastructural characteristics of rice straw degradation by ruminal cellulolytic bacterium, Ruminococcus albus F-40, were investigated. The degadation of rice straw and the adhesion rate of bacteria to the substrates increased with the decrease of cellulose crystallinity, suggesting the preferential degradation of amorphorous cellulose by R. albus. Polarized light microscopy and X-ray diffraction analyses, however, showed that crystalline cellulose in rice straw was also degraded by R. albus FT-IR spectra indicated that hemicellulose was also degraded by this bacterium. Electron microscopic(EM) investigations showed the protuberant structures on the surface of R. albus. Glycocalyx extended from the bacterial surface adhered tightly to the cellulosic substrates and vesicles occurred to the surface of cellulose substrates under the degradation. Cellulosome-like structures occurred on the surface of bacterial cells and on the cellulose microfibrils as well. EM examinations revealed that the degradation of cellulose by R. albus was proceeded as 1) adhesion of bacterium on the substrates 2) hemicellulose degradation 3) cut-off of axial fiber cellulose and 4) defibrillation of cellulose microfibril. Immuno-EM studies using the polyclonal antibodies of endocellulase from bacterial cell surface showed the intense gold labelling on the cellulose of rice straw at the beginning stage of degradation. Positive gold labelling in vesicles and glycocalyx indicated that these surface structures were involved in the degradation of cellulose. Catalytic domain of endocellulase was localized externally along the axis of cellulose microfibrils, indicating the direct involvement of this enzyme fraction in the degradation of cellulose.
폐수처리 슬럿지와 퇴비 및 목탄의 화학적 특성과 구조에 관한 연구
임기표,위승곤 한국펄프종이공학회 2003 펄프.종이技術 Vol.35 No.1
To understand the chemical structure of sewer sludge in comparison with commercial compost and charcoal used as a soil improver, it was carried out to analyse their ash contents and metal ions, and to elucidate the chemical structure of their residuals after a sequential treatment of alcohol-benzene(1:2) extraction in Soxhlet, 3% HCl reflux and 79% H₂SO₄ hydrolysis, using CHNS analyzer and solid C-13 NMR spectrometer. The results obtained were as follows: 1. Ash content of sludge was about 46% that is higher than those of compost (17%) and charcoal (4%). 2. The residual of sludge after a sequential treatment of HCl and H₂SO₄ hydrolyses had high ash content about 23%, too. 3. The sludge seems to be suitable to the soil improver because the content of heavy metal ions in sludge was near the compost and below the organic fertilizer standard. 4. Elemental composition of sludge residual after HCl-H₂SO₄ hydrolyes was C/sub 56/H/sub 91/O/sub 12/N₂S = (C/sub 6/H/sub 10/O/sub 5/)/sub 7/(C/sub 6/H₄)/sub 7/C₂H/sub 43/O₂N₂S, similar to C/sub 103/H/sub 122/O/sub 33/N/sub 6/S = (C/sub 6/H/sub 10/O/sub 5/)/sub 6/(C/sub 6/H₄)/sub 10/C/sub 7/H/sub 22/O₃N/sub 6/S of compost. 5. The sludge residual had proved to have both considerable aliphatic and aromatic groups, but the compost residual to have mainly aliphatic groups and the charcoal to have mainly aromatic groups, through the peak analysis of solid C-13 NMR charts. 6. So, the sewer sludge is proved to have a considerable amount of aromaticity like in woody biomass containing lignin.