• 한국식품영양학회지
• /
• 제7권4호
• /
• pp.332-337
• /
• 1994

The antioxidant activity of solvent extracts isolated from barley leaves was investigated by measuring peroxide value. The fractions of methanol extract obtained from preparative TLC was also studies, with UV-Visible spectrum, total phenol contents and hydrogen donating ability(HDA) The antioxidant activity of various solvent extracts was, in decreasing order, methanol> ethyl ether> methylene chloride $\geq$ ethyl acetate $\geq$acetone> hexane. The antioxidant activity of the fractions of methanol extract was, in decreasing order, fraction 2> fraction 3> fraction 1 and their activity was all superior to that of tocopherol at 500 ppm level. All fraction(1, 2 and 3) exhibited a strong UV absorption at 280 m which would be specifically produced by phenolic compound. UV absorption at 280 m of fraction 2 was greater than those of fraction 1 and 3. In the visible spectrum of these fractions, the maximum .absorption wavelengths of fraction 1, 2 and 3 were 660, 460 and 460 m, respectively. Antioxidant activity of barley leaves seemed to be due to the flavonoids containing phenolic group by UV spectrum and total phenol content.

• Macromolecular Research
• /
• 제17권11호
• /
• pp.919-925
• /
• 2009

The enzymatic polymerization of 12-hydroxystearic acid (12-HSA) was carried out with Lipase $CA^{(R)}$ in benzene to produce poly(12-hydroxystearate) (PHS) with a low molecular weight. When this polymerization was continued for a long reaction time, the PHS once formed was depolymerized into a cyclic diester, 13,16-dihexyl-1,14-dioxacyclohexacosane-2,15-dione (12-HSAD). Similar polymerization and depolymerization were observed when 12-hydroxyoleic acid (12-HOA) was treated with Lipase $CA^{(R)}$, whereas only polymerization occurred when 12-hydroxydodecanoic acid (12-HDA) was treated in a similar manner. The preferential formation of cyclic diesters for 12-HSA was attributed to the structural requirements due to the bulky n-hexyl side groups stemming from the ring systems.

• 대한전자공학회논문지SD
• /
• 제42권6호
• /
• pp.9-16
• /
• 2005

터보부호는 반복복호가 진행됨에 따라서 AWGN 채널 환경에서 BER 성능이 향상된다는 것은 잘 알려진 사실이다. 그러나 다양한 채널 환경하에서 반복복호 횟수가 증가하면 무의미한 반복이 이루어져서 복호하는데 필요한 복호 지연시간과 계산량이 증가하게 되는 단점을 가진다. 따라서 본 논문에서는 터보부호의 계산량과 평균 반복복호 횟수를 크게 감소시킬 수 있는 효율적인 반복중단 알고리즘을 제안한다. 제안된 반복중단 알고리즘은 고정된 반복 횟수 이전에 반복복호를 효율적으로 중단시킬 수 있는 기법으로써 터보복호기의 최종 출력값인 LLR의 분산값을 중단조건으로 이용하여 BER 성능의 손실없이 계산량과 평균 반복복호 횟수를 크게 감소시킬 수 있음을 확인하였다. 모의실험 결과, 제안된 알고리즘의 계산량은 SCR 알고리즘과는 비슷하였으나 CE 알고리즘과 비교하여 약 $40\%$ 정도 줄일 수 있었다. 또한, 제안된 알고리즘의 평균 반복복호 횟수는 HDA 알고리즘이나 SCR 알고리즘과 비교하여 높은 SNR에서 각각 최대 $9.94\%$와 $8.32\%$ 정도의 감소효과를 나타냈으며 CE 알고리즘과 비교하여 약 $2.16\%{\~}7.84\%$ 정도의 감소효과를 나타내었다.

• 한국식품과학회지
• /
• 제28권6호
• /
• pp.1157-1163
• /
• 1996

방아의 ether추출물을 중성, 페놀성, 산성 및 염기성 획분으로 분획한 다음 그들의 항산화 활성을 수소 공여능, 과산화물가, TBA가 및 흰쥐 간 microsome을 이용한 비효소적 지질 과산화 억제 활성 등으로 측정하고, 항산화 활성이 비교적 높게 나타나는 페놀성 획분과 중성 획분을 다시 소획분으로 분획한 다음 그중에서 항산화 활성이 강한 소획분성분을 GC/MS 및 NMR로 분석, 동정하였다. 페놀성 획분은 DPPH에 의한 수소 공여능, POV, TBA가 및 흰쥐 간 microsome의 지질 과산화 억제 활성 등 모두에서 높게 나타났으며, 중성 획분은 흰쥐 간 microsome의 지질 과산화 억제 활성에서 높게 나타났다. 페놀성 획분을 소획분으로 분획하였을 때 소획분 P-1, P-2 및 P-3에서 항산화 활성이 강하였으며, 특히 P-2는 합성 항산화제인 BHT나 천연 항산화물질로 알려져 있는 caffeic acid보다도 강하였다. 소획분 P-2를 TMS 유도체로 만들어 GC로 분석하였을 때 major peak 성분인 Peak I, II, III 및 IV 모두 TMS m/z 73를 base peak로 가지고 있어 4개의 peak 모두 -OH, -COOH기를 가지고 있는 것으로 확인할 수 있었다. 중성 획분의 소획분 중에는 N-2에서 강한 활성을 나타내었고 소획분 N-2의 주성분을GC/MS 및 NMR로 분석 한 결과 estragole로 확인되었다. Estragole의 흰쥐 간 microsome의 지질 과산화 50% 억제 농도는 $20{\sim}50\;{\mu}g/ml$로서 BHT보다는 약하였으니 caffeic acid, gallic acid와는 비슷한 수준의 항산화 활성을 나타내었다.

• Journal of Plant Biotechnology
• /
• 제1권2호
• /
• pp.109-115
• /
• 1999

A linkage map of Capsicum annuum L. was constructed by random amplified polymorphic DNA (RAPD) markers followed in a backcross population of an intraspecific cross between cultivars HDA210 and Yatsufusa. A total of 420 random primers were tested and 311 polymorphic bands were generated by 158 random primers. Among them, 86 Yatsufusa specific bands generated by 52 primers were examined for mapping. Most bands except three segregated in Mendelian fashion fitting the expected 1:1 ratio. The total length of the map was 533 cM distributed in 15 linkage groups. The map distance between adjacent markers ranged 0 to 32.8 cM, with an average distance of 9.1 cM (63 markers). Some markers were clustered and this may be due to the amplification of a repetitive sequence by the RAPDs. Primer pairs for a sequence characterized amplified region (SCAR) were developed and the segregation scores by the SCAR primers were in accordance with the RAPD data. Two QTL markers for number of axillary shoots and for early flowering were developed. One QTL for early flowering located in the linkage group 3 and explained 61 "io of the phenotypic variation. The other QTL for the number of axillary shoots located in the linkage group 4 explained 55 % of the phenotypic variation.tion.

• 청정기술
• /
• 제12권2호
• /
• pp.95-100
• /
• 2006

엑서지 개념을 이용하여 BTX 공정의 일부인 분별증류 및 수소첨가알킬제거 공정에 대한 열역학적 해석을 실시하였다. 공정에 화학반응이 관계되는 까닭에 엑서지 값은 물리적 엑서지와 화학적 엑서지의 합으로서 구했으며 모든 계산은 공정의 조업자료를 바탕으로 한 전산 모사의 결과를 기반으로 하였다. 엑서지 손실을 구동 엑서지와 물질 엑서지 손실로 구분하여 정의하고 각각의 값을 구하였으며 그 결과를 바탕으로 공정의 에너지 이용 개선방안을 제시하였다. 엑서지 해석을 통해 공정의 내부에서 손실되는 엑서지 정확한 양과 그 위치를 파악할 수 있었으며 엑서지 해석이 산업생태학 개념의 이용과 손실방지책 연구를 위한 기초가 될 수 있음을 확인할 수 있었다.

• 대한한의학회지
• /
• 제26권4호
• /
• pp.98-107
• /
• 2005

Objectives: Acupuncture treatment has been clinically used for functional recovery in Parkinson's disease. In the present study, we investigated the effect of acupuncture at Zusanli (ST36) on nigrostriatal dopaminergic neuronal cell death in rats. Methods: A Parkinson's disease model was induced by the unilateral injection of 6-hydroxydopamine (6-OHDA) into the striatum. Acupuncture treatment was performed at Zusanli (ST36) and at the hip, as a non-acupoint, once a day for 14 days. Two weeks after 6-0HDA injection, an apomorphine-induced rotational behavior test showed significant rotational asymmetry in rats with Parkinson's disease. Immunostaining for tyrosine hydroxylase demonstrated a dopaminergic neuronal loss in the substantia nigra and dopaminergic fiber loss in the striatum. Results: Acupuncture at the ST36 acupoint significantly inhibited rotational asymmetry in rats with Parkinson's disease, and also protected against 6-OHDA-induced nigrostriatal dopaminergic neuronal loss. These effects of acupuncture were not observed for non-acupoint acupuncture. Conclusions: The present study shows that acupuncture treatment, especially at the ST36 acupoint, can be used as a useful strategy for the treatment of Parkinson's disease.

• Bulletin of the Korean Chemical Society
• /
• 제29권10호
• /
• pp.1960-1964
• /
• 2008

The roles of coordinating ligands (TOPO, OA, HDA, and TDPA) for the synthesis of ZnO nanoparticles are investigated. Various shapes (hexagonal cone, hexagonal plate, and rod) and sizes (5-100 nm) of ZnO nanoparticles are prepared in relation to the coordinating ligands. The hexagonal shapes ($\leq$ 100 nm) are synthesized with TOPO and OA, while smaller size nanorods (5 ${\times}$ 30 nm) are with TOPO and TDPA. The relative intensities of two distinctive emission bands centered at 385 and 500 nm, which are related to the exciton and defect states, respectively, depend on the crystal qualities of ZnO nanoparticles affected by the coordinating ligands. The intense UV emissions with the reduced visible emissions are found in the monodisperse nanoparticles such as hexagonal cones and nanorods, suggesting that the monodispersity as well as the crystallinity is closely related to the coordinating ligands. The blue-shift of photoluminescence and absorption edge is observed in the nanorods, because the sizes of the nanorods are in the quantum confinement regime.

• Corrosion Science and Technology
• /
• 제15권6호
• /
• pp.314-319
• /
• 2016

Reduced activation ferritic-martensitic steels (RAFM) are envisaged in future fusion technology as structural material which will be in direct contact with a flowing liquid lead-lithium melt, serving as breeder material. Aluminium-based coatings had proven their ability to protect the structural material from corrosion attack in flowing Pb-15.7Li and to reduce tritium permeation into the coolant, significantly. Coming from scales produced by hot dipping aluminization (HDA), the development of electrochemical-based processes to produce well-defined aluminium-based coatings on RAFM steels gained increased attention in research during the last years. Two different electrochemical processes are described in this paper: The first one, referred to as ECA, is based on the electrodeposition of aluminium from volatile, metal-organic electrolytes. The other process called ECX is based on ionic liquids. All three processes exhibit specific characteristics, for example in the field of processability, control of coating thicknesses (low activation criteria) and heat treatment behavior. The aim of this article is to compare these different coating processes critically, whereby the focus is on the comparison of ECA and ECX processes. New results for ECX will be presented and occurring development needs for the future will be discussed.

• Journal of Ginseng Research
• /
• 제19권3호
• /
• pp.197-201
• /
• 1995

The present study was undertaken to elucidate the behavioral characteristics of nootropic candidates, entrophenoxine, N-methyl-D-glucamine, piracetam and red ginseng saponin components on stereotyped sniffing behavior induced by apomorphine in rats. Apomorphine, a direct dopaminergic receptor agonist, induced stereotyped behaviors including sniffing licking growing and biting in a dosedependent manner, and that behaviors were completely inhibited when measured at 1 week after 6-ydroxydopamine(6-HDA) treatment. Centrophenoxine, N-methyl-D-glucamine, red ginseng total saponin(TS), panaxatriol (PT), and Rg1 enhanced but panaxadiol (PD) inhibited, whereas piracetam and Rb1 were not effective of the sterotyped sniffing behavior induced by apomorphine(1mg/kg). The enhanced stereotyped behavior by centrophenoxine, N-methyl-D-glucamine, red ginseng total saponin, panaxatriol(PT), and Rg1 seems to have a similarity to entrophenoxine, N-methyl-D-glucamate in modulating of dopaminergic neuroal activity and also my be useful for the nootropic candidates.