• Title/Summary/Keyword: Molecular Characteristics

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Taxonomic Position and Affinities of Isopyrum mandshuricum within Korean Isopyroideae (Ranunculaceae) Based on Molecular Data

  • Lee, Nam-Sook;Yeau, Sung-Hee;Kim, Ji-Hyun;Kim, Min-Ju
    • Animal cells and systems
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    • v.3 no.2
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    • pp.133-141
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    • 1999
  • To examine the taxonomic position and affinities of Isopyrum mandshuricum (Ranunculaceae) and related taxa, genetic analysis were carried out on the basis of isozyme patterns and ITS sequences. Molecular data, both isozyme patterns and ITS sequences suggest that I. mandshuricum is closely related to Enemion raddeanum than to Semiaquilegia adoxoides. The estimation of genetic identities by isozyme analysis reveals that I. manshuricum is genetically distant from E. raddeanum. The phylogenetic tree based on molecular data is rather congruent with the phenogram based on quantitative morphological characteristics, but not consistent with one based on qualitative morphological characteristics. Incongruencies between molecular and qualitative morphological data provide clues to re-evaluate several morphological features.

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Quality Characteristics of Ginseng Powder using Molecular Press Dehydration Method (분자 압축 탈수방법을 이용한 인삼분말의 품질특성)

  • Lee, H.S.;Kwon, K.H.;Jeong, J.W.
    • Journal of Biosystems Engineering
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    • v.34 no.3
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    • pp.155-160
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    • 2009
  • This study was attempted to quality characteristics of ginseng powder using molecular press dehydration(MD) method. Ginseng powder was dried using maltodextrin as dehydrating agents, and the quality of the ginseng powder was compared with that of freeze-drying and hot air-drying samples in terms of colors, moisture contents and grain size. The colors of ginseng powder using MD-drying and freeze-drying was better than hot air-dried ginseng powder. The moisture contents of ginseng powder using MD-drying was 9.49%, while freeze-drying was 4.14% and hot air-drying 11.71% after 72ball mill times. The grain size of ginseng powder using MD-drying and freeze-drying was better than hot air-drying ginseng powder. These results suggest that drying of ginseng powder using molecular press dehydration method is very efficient, because minimal cell destruction may be achieved.

Fabrication and Characteristics of LB Ultra-thin Film Capacitor (I) (LB 초박막 커패시터의 제작 및 특성 (I))

  • 최용성;신훈규;권영수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1995.11a
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    • pp.277-280
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    • 1995
  • We had experiment using LB method that can fabricate molecular order ultra-thin film below 100${\AA}$. LB mettled has known as main technology of information society in 21C, because it is nut only free oriention and alignment of molecular but also ability of thickness control as molecular order. In this paper, the fabricated condition and physical properities of functional ultra-thin film of molecular order was investigated and highly efficient ultra-thin film capacitor was fabricated by using ultra-thin LB film for application as electronic device. Possibility of ultra-thin film capacitor was researched by analizing rind measuring electrical properties. Polyimide ultra-thin LB film capacitor was fabricated, ensured theoretically rind experimentally its possibility in range of 10Hz∼ 1MHz through its frequency characteristics.

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Fabrication and Characteristics of LB Ultra-thin Film Capacitor (II) (LB 초박막 커패시터의 제작 및 특성 (II))

  • 유승엽;박재철;권영수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1996.05a
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    • pp.244-247
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    • 1996
  • We had experiment using LB method that can fabricate molecular order ultra-thin film below 100${\AA}$. LB method has known as main technology of information society in 21C, because it is not only free orientation and alignment of molecular but also ability of thickness control as molecular order. In this paper, the fabricated condition and physical properties of functional ultra-thin film of molecular order was investigated and highly efficient ultra-thin film capacitor was fabricated by using ultra-thin LB film for application as electronic device. Possibility of ultra-thin film capacitor was researched by analyzing and measuring electrical properties. Polyimide ultra-thin LB film capacitor was fabricated, ensured theoretically and experimentally its possibility in range of 10Hz∼lMHz through its frequency characteristics.

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The Rheological Properties of Printing Ink according to the Molecular Weight of Rosin Modified Phenol Resin (로진 변성 페놀 수지의 분자량 변화에 따른 인쇄 잉크의 유변학적 특성에 관한 연구)

  • Lee, Kyu-Il;Kim, Sung-Bin;Kim, Tae-Hwan
    • Journal of the Korean Graphic Arts Communication Society
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    • v.24 no.1
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    • pp.1-12
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    • 2006
  • The rheological characteristics of an ink relate to its performance on the press and to the printing quality such as ink stability, transfer characteristics, mottle, squash, misting, dot gain, and so on. For lithographic print, the emulsification of ink is an important factor to determine the product. And also the rheological characteristics of the emulsified ink should be investigated. Thus, in this study, the effects of the changing molecular weight of rosin modified phenolic resin on the water-pickup ratio of neat inks were studied. And then rheological properties of neat inks and emulsified inks with changing molecular weight of rosin modified phenolic resin were analyzed by using rotational rheometer.

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Molecular orientation and electrical properties of TCNQ ultrathin organic films (TCNQ 유기초박막의 분자 배향 및 전기적 특성)

  • 이용수;신동명;김태완;강도열
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1997.11a
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    • pp.5-8
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    • 1997
  • A study on the electrical conduction characteristics of the ultrathin organic films is one of the important factors for the development of molecular electronic devices. The Langmuir- Blodgett(LB) technique has recently been attracted interest as a method of the deposition ultrathin films. We hate fabricated N-docosyl N\`-methyl viologen-diTCNQ(DMVT) anion radical LB film and investigated the molecular orientation and electrical conduction characteristics. We have measured infrared transmission-reflection spectra. The alkyl chain is found to he well-ordered with the tilt angle of 13$^{\circ}$ with respect to the substrate surface normal and the TCNQ plane is tilted at 76$^{\circ}$ the surface normal. In ESR spectrum, we confirmed that a half-amplitude linewidth is clearly dependent on the incident angle, which indicates conducting species change. The in-plane conductivity of 31 lagers is approximately 1.33$\times$10$^{-6}$ S/cm. The ohmic behaviour was observed below 0.6 V, when current-voltage(I-V) characteristics was measured verically.

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Liquid Adsorption Characteristics on Surface-treated Natural Zeolite (표면처리된 천연 제올라이트의 액체흡착 특성)

  • 이재영;이홍기;이주성;심미자;김상욱
    • Journal of Surface Science and Engineering
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    • v.26 no.6
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    • pp.285-290
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    • 1993
  • A series of samples were prepared by treating natural zeolite from Kampo area with HCl and NaOH. And, the adsorption characteristics of some liquid samples were investigated by the Diamond-Kinter method. The adsorption amount of all liquid investigated was more effective in acid treatment than in alkali treatment. In the case of n-, iso-C3H7OH, thed adsorption amount of n-form which has smaller molecular size was larger. Similar tenedncy was observed in n-, iso-C4H9OH, but the amount was lower than n-, iso-C3H7OH. In CHCl3 and CCl4, that of CHCl, which is smaller molecular size and has polarity, was far lager. From the view of the molecular size, adsorption amount of C6H5CH3 and p-C6H4(CH3)2 showed the characteristics of surface activity rather than chemical treatment.

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Influences of Aldehyde Type and p-Substituent Type on Structural Characteristics of p-Alkylphenol Aldehyde Resins Using a Molecular Simulation

  • 최성신
    • Bulletin of the Korean Chemical Society
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    • v.20 no.2
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    • pp.203-210
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    • 1999
  • Structural characteristics of isotactic p-alkylphenol acetaldehyde novolak resins with methyl, t-butyl, and t-octyl as the p-substituent and p-t-butylphenol aldehyde novolak resins with methylene, ethylidene, and propylidene as the linkage were calculated using molecular mechanics and molecular dynamics. The five p-alkylphenol aldehyde resins were found to have common structural characteristics that hydroxyl groups of the p-alkylphenols cluster in the center of the molecule by intramolecular hydrogen bonds of hydroxyl groups of the adjacent p-alkylphenols and the alkyl groups are extended out. Distances between oxygen atoms and between p-carbon atoms of the adjacent p-alkylphenols become longer as the size of the p-substituent increases from methyl to toctyl. Bond angles of the linkage built between the adjacent p-alkylphenols become wider by increasing the p-substituent size and by decreasing the linkage size.

Application of Molecular Descriptor for Prediction and Analysis of the Affinity between Alkyl Substituted Super Hydrophobic Dyes and Polypropylene Fibers (폴리프로필렌 섬유용 알킬치환 초소수성 염료의 친화력 분석과 예측을 위한 Molecular Descriptor의 활용)

  • Jang, Gyeong-Jin;Jeong, Jong-Seok;Kim, Tae-Gyeong
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2008.10a
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    • pp.77-78
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    • 2008
  • Affinity between alkyl substituted super hydrophobic dyes and polypropylene fiber has been analyzed by using the molecular descriptor as a method to predict chemical and physical characteristics of compounds. Hydrophobicity of synthesized dyes calculated by LogP which is one of molecular descriptors was increased continuously as the length of alkyl substituents increased.

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