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키토산의 색소 Toluidine Blue O 에 대한 흡착 특성
박노동(Ro Dong Park),조유영(Yoo Young Cho),김광윤(Kwang Yoon Kim),범희승(Hee Seung Bom),오창석(Chang Seok Oh),이현철(Hyun Chul Lee) 한국응용생명화학회 1995 Applied Biological Chemistry (Appl Biol Chem) Vol.38 No.5
Chitosan, a deacetylated polymer of chitin, was applied and characterized as an adsorbent for a dye Toluidine Blue O. The adsorption of Toluidine Blue O by chitosan was affected by the particle size and mass of chitosan, initial dye concentration, reaction time, and solution pH. More dye was adsorbed the smaller the chitosan particles. When initial ratio of dye to chitosan was over 1 : 500, the adsorption of dye was rapidly declined. Adsorption rate of dye to chitosan showed 2 phases, rapidly occurred one at the beginning within 3 min and thereafter very slowly occurred one. The amount of dye adsorbed was increased with increase in pH.
박노동(Ro Dong Park),이종욱(Chong Ouk rhee),이현철(Hyun Chul Lee),조종수(Chong Su Cho),조도현(Do Hyun Jo) 한국키틴키토산학회 1999 한국키틴키토산학회지 Vol.4 No.2
N/A The purpose of this study was to develop the high functional water vapor permeable/waterproof coated nylon fabric by using soluble chitosan powder in polyurethane coating solution(WSP fabric). Water entry pressure, water vapor transmission, moisture regain, static change, tearing strength, peeling strength, sewability of fabric, and reduction ratio of WSP fabric were measured for the study. The results of this study were as follows :1) The physical properties of WSP fabric treated by the use of a wet coating method were not changed very much. However, the water entry pressure decreased slightly with increasing concentration of soluble chitosan, while water vapor transmission increased slightly. In addition, tearing strength remained constant.2) Moisture regain of WSP fabric increased with the concentration of soluble chitosan . However, that of WSP fabric remained constant at above 1% concentration of soluble chitosan. Static change and peeling strength decreased with increasing the concentration of soluble chitosan. Sewability was improved with increasing concentration of soluble chitosan due to the reduction of friction on surface of WSP fabric.3) Over 90% reduction ratio of WSP fabric treated by the use of both dry and wet coating method was maintained with only 1% of chitosan even after 10 cycles of dry cleaning. Reduction ratio of WSP fabric treated by the use of a wet coating method was not changed, but reduction ratio of the sample treated by the use of a dry coating method decreased to 60% after 10 cycles of laundering.
식물계에서 N-Acetylhexosaminidase 의 탐색
박노동(Ro Dong Park),조규종(Kyu Jong Jo),김옥란(Yu Lan Jin) 한국키틴키토산학회 2001 한국키틴키토산학회지 Vol.6 No.1
N/A To screen the presence and distribution of N-acety1-β-D-hexosaminidase (HexNAc`ase, EC 3.2.1.52) in plant kingdom, leaves of 24 plant species were collected, and the enzyme activities were measured in the crude extracts. Among them, the crude enzyme preparations from corn, soybean, pepper, sweet potato, button ball, shrub althea, and jujuba showed high activity of HexNAc`ase, but no activities were detected from those from maidenhair tree, paeony, persimmon and japanese wisteria. These plants which showed high activity may be of value as an enzyme source of HexNAc`ase to study the mode of reaction and the physiological roles in plants and to develop the structural formulae of reaction-based HexNAc`ase inhibitors.
강낭콩과 대두 잎에서 세포간액 키틴분해효소의 분포와 유도
박노동(Ro Dong Park),조유영(Yu Young Cho),전덕영(Deok Young Jhon) 한국응용생명화학회 1994 Applied Biological Chemistry (Appl Biol Chem) Vol.37 No.4
Using the enzyme activity staining, we studied the induction and distribution of chitinase isozymes, pathogenesis-related proteins, in intercellular fluids of bean and soybean leaves under stress conditions. The chitinase in intercellular fluids was barely detected in healthy plant leaves. By treatment of ethylene, pathogen (Fusarium oxysporum), or wounding, only 34 kD intercellular endochitinase was induced in bean leaves, while 30 kD and 36 kD intercellular endochitinases were induced in soybean leaves.
강낭콩 잎에서 스트레스에 따른 키틴분해효소의 특이적 유도
박노동,이춘명,전덕영 ( Ro Dong Park,Choon Myong Lee,Deok Young Jhon ) 생화학분자생물학회 1992 BMB Reports Vol.25 No.2
We studied the induction of chitinase (EC 3.2.1.14), a pathogenesis-related protein, in bean plants under stress conditons. The chitinase was barely detected in healthy plant leaves but was significantly induced by ethylene, pathogen Fusarium oxysporum, or wounding, which was tested by enzyme activity assay, western blotting, and activity staining. Six isozymes of bean chitinase were separated in 12.5% SDS-PAGE. They were differentially induced when bean plants were treated with ethylene, F. oxysporum, or wounding.
에틸렌이 유도한 강낭콩 잎 키틴분해효소의 정제 및 특성
박노동,이춘명,박남용 ( Ro Dong Park,Choon Myong Lee,Nam Yong Park ) 생화학분자생물학회 1991 BMB Reports Vol.24 No.2
Chitinase (EC 3.2.1.14), a potential pathogensis-related protein, was induced in leaves of 30-day-old bean (Phaseolus vulgaris) plants with treatment of 10 nl/ml ethylene for 30 hr. The enzyme was extracted in sodium citrate buffer (pH 5.0), and then purified by heat treatment, (NH₄)₂SO₄ precipitation, chitin-affinity and Sephadex G-75 chromatographies. Chitinase was enriched 22.5-fold with a yield of 29%. Its apparent molecular weight was estimated on SDS-PAGE to be 30 kD. Chitinase showed optimum pH 5.0 and broad pH stability, and showed thermal stability below 50℃. K_m and V_(max) values of the purified chitinase were 0.36 ㎎/㎖ and 0.7 nmole G1cNAc/min, respectively, for swollen chitin as a substrate. Chitinase was significantly inhibited by 10 mM Cu^(++), Hg^(++), S₂O₃^(--), S₂O₄^(--) or SO₃^(--) in reaction mixtures. Antibody was raised in rabbits against the chitinase and used for specific immunodetection of the enzyme.
수분장애(水分障碍) 및 염장애(鹽障碍)하에서 수도체(水稻體)중 효소수준(酵素水準) 및 유기대사산물(有機代謝産物)과 무기(無機)이온 함량의 변화
박노동,Park, Ro-Dong 한국응용생명화학회 1982 Applied Biological Chemistry (Appl Biol Chem) Vol.25 No.3
Pot에 재배(栽培)한 수도(水稻) 진주벼와 이리 348호(號)에 수분 결핍과 염장애를 유도한 다음 몇가지 유기대사산물(有機代謝産物)과 무기(無機)이온의 함량(含量)을 측정(測定)하고 관계되는 몇가지 효소활성(酵素活性)을 측정(測定)하여 비교검토(比較檢討)하였다. 비내염성(非耐鹽性)으로 알려진 이리 348호(號)가 부적환경조건(不適環境條件)에서 수분손실(水分損失)이 심하고 proline의 함량(含量)도 많았다. 2품종(品種) 모두 부적환경조건(不適環境條件)에서 조단백질, 총유리아미노산, proline, polypheonol화합물(化合物)이 증가(增加)됐으나 환원량(環元糧)은 수분장애구(水分障碍區)에서만 축적(蓄積)되었다. 조단백질에 대한 유기용질(有機溶質)의 비(比)는 진주벼의 부적환경구(不適環境區)에서만 증가한 반면 이리 348호(號)에서는 변화가 없었다. 부적환경구(不適環境區)에서 황성(活性)이 증가(增加)한 효소(酵素)로는 protease, ${\alpha}-amylase$, phosphorylase가 있으며, 특히 조단백질에 대한 총유리아미노산의 비(比)의 증가(增加)는 protease에 의한 단백질의 가수분해(加水分解)에 기인했다. $Na^+$과 $Cl^-$의 함량은 이리 348호(號)에서 진주벼에서 보다 높았다. $Na^+/Ca^{2+}$과 양이온의 일가(一價)/이가(二價)의 값들은 진주벼에서 항상 낮았고, $K^+/Na^+$은 진주벼에서 높았다. 그러므로 이러한 값이 염해(鹽害)와 한발(旱魃)에 대한 저항성과 어떠한 상관(相關)이 있는지 더욱 연구(硏究)할 필요가 있다고 본다. Two rice cultivars, Jinju and Iri 348, were used to compare the changes in the contents of some organic metabolites and ions and in some enzyme levels under water-and salt-stressed conditions. The water loss and proline accumulation under water and salt stresses were accelerated more in the salt-sensitive cultivar Iri 348 than in the salt-tolerant Jinju. The contents of crude protein, total free amino acids, proline and polyphenols increased under water-or salt-stressed rice, but that of reducing sugar increased under water stress only. The water-and salt-stresses induced the high ratio of low molecular organic solutes to crude protein in Jinju but not in Iri 348. The ratio of total free amino acids to crude protein increased under the stressed conditions was likely due to high protease activity. The contents of $Na^+$ and $Cl^-$ were higher in Iri 348 than in Jinju. Iri 348 had higher values of $Na^+/Ca^{2+}$ and monovalent/divalent of cations, but lower of $K^+/Na^+$ than Jinju Rice. The further studies should emphasize to set the correlations between these ratios and tolerance to water and salt stresses among rice cultivars.