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한영숙,가와이히로야스 한국조리과학회 1995 한국식품조리과학회지 Vol.11 No.1
The molar ratio of sterol to phospholipid differed from yeast strains, and the ratio was relatively higher in non-freeze-tolerant yeast strain, S. cerevisiae than freeze-tolerant yeast strains, D_(2-4) or CFY. Phospholipid composition of these yeast were also investigated. Phosphatidylcholine content was larger among phospholipids in all yeasts. Higher ratio of PC/PE was found in freeze-tolerant yeast than non-freeze-tolerant yeast. Higher proportion of linolein acid(18 : 2) against total fatty acid attached to phospholipid was observed in D_(2-4) than S. cerevisiae or CFY, and the degree of unsaturation of fatty acid was higher in D_(2-4) and CFY than in S. cerevisiae. These results suggested that the fluidity of yeast cell membrane was different in yeast strains, which might result in the difference in freezeinjury of yeast at low temperatures. 냉동내성빵효모의 냉동내성기구를 규명하기위한 일환으로 세포의 막 유동성에 관계되는 지질분석을 행하였다. 그 결과, 냉동내성효모 D_(2-4)나 CFY보다 비냉동내성 효모 Saccharomyces cerevisiae 2001이 스테롤 : 인지질의 비율이 비교적 높았다. 또 인지질조성이 조사되었는 데, 세효모 모두에 있어 phosphatidylcholine 함량이 가장 높았다. Phosphatidylcholine : Phosphatidylethanolamine의 비율은 냉동내성효모가 비내성효모 보다 높게 나타났다. 인지질에 연결된 지방산 함량을 보면, linoleic acid 함량은 D_(2-4)에서 높게 나타났으며 지방산의 불포화도는 D_(2-4)가 CFY나 S. cerevisiae보다 높았다. 이 결과에서 yeast 세포막의 유동성은 각 효모마다 다르며, 이것들이 저온에서의 효모의 동결장해에 영향을 주는 것으로 생각된다.
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Control of the Ordered-Disordered State of B-site Ions in Ferroelectric Relaxor Superlattices
Hitoshi Tabata,가와이,Yasushi Hotta 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Relaxor type ferroelectrics are treasure boxes both for basic physics and practical applications. Among them, Ba(Zr,Ti)O3 is one of the candidate materials for elucidating the mechanism of relaxor phenomena. It has homo-valent B-site ions of Zr4+ and Ti4+. Therefore, there is no driving force to push the ions into ordered structure. On the other hand, it has a possibility of co-existence of multi phases (so-called pinching eect). In case of the bulk state, we have found that the relaxor behavior is strongly aected by the annealing conditions. To make clear the intrinsic parameter for the relaxor, we have demonstrated the articial control the positioning of the B-site ions by the superlattice technique. The stacking periodicity and the compositional combination of BaTiO3 and BaZrO3 are changed systematically with this method and the sign of the relaxor is detected.
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Young-Geun Park,가와이,이혜연,Hidekazu Tanaka,Hitoshi Tabata 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Switching of ferroelectric P-V hysteresis curve by light irradiation has been achieved in organic photoconductor (PC) copper phthalocyanine (CuPc)/inorganic ferroelectric (FE) BaTiO3 (BTO) heterojunction photomemory. The main mechanisms of this PC/FE photomemory device are the resistance decrease of photoconductor by light irradiation and the increase of ferroelectric remanent polarization by increasing applied bias. We have also investigated the eect of CuPc thickness on the photoinduced change of ferroelectric P-V hysteresis curve, and found that the intrinsic insulating dark resistance of organic photoconductor CuPc lm layer plays an important role for high eciency of PC/FE heterojunction photomemory. Light irradiation could switch the remanent polarization of ferroelectric BTO in this heterojunction up to 3 C/cm2, almost full remanent polarization of BTO single layer ferroelectric, whereas remanent polarization of that without light irradiation was almost zero. The eciency of this heterojunction photomemory reached up to 500 %.
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Electrical Recognition of Label-Free Oligonucleotides upon Streptavidin-Modified Electrode Surfaces
이혜연,Jong Wan Park,Ho Sub Jung,가와이 한국생물공학회 2005 Biotechnology and Bioprocess Engineering Vol.10 No.6
For the purpose of developing a direct label-free electrochemical detection system, we have systematically investigated the electrochemical signatures of each step in the preparation procedure, from a bare gold electrode to the hybridization of label-free complementary DNA, for the streptavidin-modified electrode. For the purpose of this investigation, we obtained the following pertinent data; cyclic voltammogram measurements, electrochemical impedance spectra and square wave voltammogram measurements, in Fe(CN)63-/Fe(CN)64- solution (which was utilized as the electron transfer redox media-tor). The oligonucleotide molecules on the streptavidin-modified electrodes exhibited intrinsic redox ac-tivity in the ferrocyanide-mediated electrochemical measurements. Furthermore, the investigation of elec-trochemical electron transfer, according to the sequence of oligonucleotide molecules, was also under-taken. This work demonstrates that direct label-free oligonucleotide electrical recognition, based on bio-functional streptavidin-modified gold electrodes, could lead to the development of a new biosensor proto-col for the expansion of rapid, cost-effective detection systems.
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