• Title/Summary/Keyword: P-I Characteristics

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Characteristics of Light Harvesting Chlorophyll-Protein Complex and Singlet Oxygen ($^1O_2$) Quenching in Leaf-burning Disease from Panax ginseng C. A. Meyer (인삼 Light Harvesting Chlorophyll Protein의 특성 및 엽소병에서 Singlet Oxygen($^1O_2$) Quenching)

  • 양덕조;이성택
    • Journal of Ginseng Research
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    • v.13 no.2
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    • pp.158-164
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    • 1989
  • In order to determine the relationships between the lea(-burning disease and the light harvesting chlorophyll-protein (LHCP) complex in Panax ginseng C. A. Meyer, we investigated the chlorophyll-protein (CP) complex of the thylakoid membrane and its characteristics. In P. ginseng four Cp-complex bands determined by non-denaturing SDS-PAGE were identified CP I'(containing reaction center of photosystem I and LHCP I antennae), CP I (reaction center of photosystem I) LHCP II** (oligoform of LHCP II), and LHCP II (photosystem II antennae, CP 26 and CP 29) by Bassis and Dunahay's procedures. Under our experimental condition, the CP I band was only observed in P. ginseng and the band intensity of LHCP II** in P ginseng was higher than in spinach and soybean. There were differences in the absorption and fluorescence spectra and chlorophyll a/b ratio of the CP-complex bands between P. ginseng and other Plants. The Polypeptidr content of P. ginseng thylakoid was lower than in spinach and soybean thylakoid, and the Polypeptide profiles of P. ginseng was low band intensity, especially about 29-35 kD, 55 kD, and 60 kD, compared to spinach and soybean. The inhibitory effects of 2,5-dimethylfuran, specific singlet oxygen ($^1O_2$) quencher, showed that singlet oxygen destroyed 60% of chl.a, 90% of chl.b and 70% of carotenoid in bleaching P. ginseng with leaf-burning disease.

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Reassessment of the Taxonomic Status of Four Pagurus Species (Crustacea: Decapoda: Paguridae) in Korea Using DNA Barcoding

  • Jung, Jibom;Kim, Won
    • Animal Systematics, Evolution and Diversity
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    • v.36 no.1
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    • pp.10-14
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    • 2020
  • Pagurus is the most diverse hermit crab genus in Korea. In this study, the cytochrome c oxidase subunit I (COI) and 16S rRNA of 24 individuals from four Korean Pagurus species (i.e., 7 Pagurus brachiomastus, 8 P. proximus, 8 P. simulans, and 1 P. rectidactylus) were sequenced and analyzed. No genetic difference was found between the COI and 16S rRNA sequences of P. brachiomastus and P. simulans, and the COI sequences of P. rectidactylus and P. quinquelineatus (comparative species from NCBI). Considering the morphological and ecological characteristics together, we assume that P. simulans and P. rectidactylus are subspecies of P. brachiomastus and P. quinquelineatus, respectively. This study should facilitate further research on the taxonomic status of these species.

Anti-Corrosion Characteristics of WC-based Alloy Coatings Fabricated by HVOF Process - Polarization Characteristics in Acid Solution - (HVOF 용사법에 의해 제조된 WC계 합금 코팅층의 방식특성(I) - 산성용액에서의 분극특성 -)

  • Kim, Tae-Yong;Kim, Yeong-Sik
    • Journal of Power System Engineering
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    • v.18 no.4
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    • pp.72-77
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    • 2014
  • The aim of this study to investigate polarization characteristics of WC-based alloy coatings fabricated by high velocity oxygen fuel(HVOF) process. The coatings were fabricated by HVOF process with WC-CrC-Ni, WC-Co-Cr, WC-Co composite powders. Corrosion tests were carried out using potentiostat/galvanostat at solution with pH 2 and pH 6. Corrosion potential(Ecorr) and corrosion current density(Icorr) could be analyzed from polarization curve. WC-Co-Cr coating showed more incorrodible characteristics than other coatings at solution pH 2. WC-CrC-Ni coating was more favorable anti-corrosion characteristics than other coatings at solution with pH 6.

Improved Breakdown Voltage Characteristics of $In_{0.5}Ga_{0.5}P/In_{0.22}Ga_{0.78}As/GaAs$ p-HEMT with an Oxidized GaAs Gate

  • I-H. Kang;Lee, J-W.;S-J. Kang;S-J. Jo;S-K. In;H-J. Song;Kim, J-H.;J-I. Song
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.3 no.2
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    • pp.63-68
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    • 2003
  • The DC and RF characteristics of $In_{0.5}Ga_{0.5}P/In_{0.22}Ga_{0.78}As/GaAs$ p-HEMTs with a gate oxide layer of various thicknesses ($50{\;}{\AA},{\;}300{\;}{\AA}$) were investigated and compared with those of a Schottky-gate p-HEMT without the gate oxide layer. A prominent improvement in the breakdown voltage characteristics were observed for a p-HEMT having a gate oxide layer, which was implemented by using a liquid phase oxidation technique. The on-state breakdown voltage of the p-HEMT having the oxide layer of $50{\;}{\AA}$was ~2.3 times greater than that of a Schottky-gate p-HEMT. However, the p-HEMT having the gate oxide layer of $300{\;}{\AA}$ suffered from a poor gate-control capability due to the drain induced barrier lowering (DIBL) resulting from the thick gate oxide inspite of the lower gate leakage current and the higher on-state breakdown voltage. The results for a primitive p-HEMT having the gate oxide layer without any optimization of the structure and the process indicate the potential of p-HEMT having the gate oxide layer for high-power applications.

Aerodynamic Characteristics of Korean Bilabial Stop Consonant in Vowel Environment (모음환경에 따른 한국어 양순 파열음의 공기역학적인 특징)

  • Park Sang Hee;Lee Ok Bun;Jeong Ok-ran;Seok Dong Il
    • Proceedings of the KSPS conference
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    • 2002.11a
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    • pp.129-132
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    • 2002
  • Aerodynamic analysis study was performed on 14 normal subjects(2 male, 12 female) by nonsense syllables composed of Korean bilabial stop(/p, p', $p^{h}$) and their preceding and/or following vowel /i, a, u/. That is [pi, p'i, phi, pa, p'a, pha, pu, p'u, $p^{h}u$]. All measures were analysed using Aerophone II voice function analyzer and included peak air pressure, mean air pressure, maximum flow rate, volume, mean SPL. As results, first, MSPL and MAP of /p, p', $p^{h}$/ themselves were significantly different. In addition, different vowel enviroment also produced significantliy different aerodynamic chracteristics those consonants.

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A Study on the Habitat Environment Survey and Conservation of Rhododendron micranthum in National Baekdudaegan Arboretum (국립백두대간수목원 꼬리진달래 자생지 환경특성 및 보전방안)

  • Chung, Bo-Kwang;Gang, Sin-Gu;Bae, Jun-Gyu;Kim, Jae-Hyeon;Lee, Juyoung;Chang, Jeong-Won;Lee, Sang-Hyun;Lee, Yeong-Su;An, Min-Woo;Kim, Gi-Song
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.19 no.6
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    • pp.87-100
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    • 2016
  • This research was performed for the purpose of providing useful and base data and preservation strategy of growth characteristics of Rhododendron micranthum. From the result of research, wild growth area of Rhododendron micranthum was discovered near steep forest road on 695~901m in altitude above sea level of Baekdu-daegan National Arboretum. Vegetation colony structure of Site I was resulted in Pinus densiflora(tree stratum M.I.P.=45.3%) is dominants, Betula schmidtii(arborescent M.I.P.=9.8%) is second dominant, and Site III resulted in Pinus densiflora(tree stratum M.I.P.=30.5%) is dominants, Betula schmidtii(arborescent M.I.P.=10.3%) is second dominant. Site II resulted in Betula schmidtii(arborescent M.I.P.=30.4%) is dominants and Pinus densiflora tree(tree stratum M.I.P.=8.3%) is second dominants. For herbs, it was researched that the rate of one year herb of chrysanthemum family(10), rice family(3), sedge(2) was higher than near forest area. Among Species diversity index, that of Shannon was in range of 0.7348~1.1090. After comparing this with similar area, this value was relatively low. Dominance analysis result was analyzed that various groups are evenly distributed. Monthly highest average temperature is $23.9^{\circ}$ in Site A and Site B, and monthly lowest average temperature is $-4.5^{\circ}C$ in Site I and $-4.7^{\circ}C$ in Site II. Monthly maximum average humidity is 85.6% in Site I and 83.2% in Site II. Monthly minimum average humidity is 60.9% in Site I and 60.8% in Site II and it showed that these 2 area are located far away but have similar temperature and humidity characteristic and climate environment is similar. It was analyzed that humidity is high with the result of annual average humidity is over 60%. In growth characteristic, it showed that doubt damage of Stephanitis pyrioides, exposure of roots, peeled bark was discovered and supplement on this is urgent.

A Study on the Relationship between Image of Physiotherapist and Self-Esteem of Physiotherapy Students (물리치료(학)과 학생들이 지각한 물리치료사의 이미지와 자아존중감과의 관련성 분석)

  • Kim, Eun-Ae;Lee, Geon-Cheol;Bae, Won-Sik;Kim, Chi-Hyok
    • Journal of the Korean Society of Physical Medicine
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    • v.8 no.1
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    • pp.19-27
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    • 2013
  • PURPOSE: The purpose of this study is to look into relationship between image of physiotherapist and self-esteem of physiotherapy students and desirable image of physiotherapists offer to establish basic materials. METHODS: The subjects of this study are consist of 603 students of department of Physical therapy university and college in Busan and Kim-hae. Data are collected from June 9 to July 9 in 2011 by structured questionnaires. RESULTS: The result are as follows. 1. at the physiotherapist image score, the highest score question is "Physiotherapist is specialist"(3.45) and the lowest score question is "Physiotherapist is treated samely with doctor"(2.15). 2. at the self-esteem score, the highest score question is "I think that I am at least as valuable as others"(3.37) and the lowest score question is "I can be poorly sometimes"(2.81). 3. at the static results of physiotherapist image score gap by general characteristics, there are significantly different in gender(t=2.27, p=.02), similar profession distinction(t=4.30, p=.00), major satisfaction(t=5.74, p=.00), school system (t=-2.54, p=.01). 4. at the static results of self-esteem score gap by general characteristics, there are significantly different in years (f=5.14, p=.00), gender(t=4.09, p=.00), religion(f=2.87, p=.04), similar profession distinction(t=3.97, p=.00), major satisfaction(t=4.26, p=.00). 5. at the static results of good reputation of physiotherapists increase self-esteem of physiotherapy students score question are significantly different(r=0.53, p=.00). CONCLUSION: Accordingly, these results of this study that there is a very correlation between image of physiotherapist and self-esteem of physiotherapy students. Therefore, good reputation of physiotherapists increase self-esteem of physiotherapy students.

Emulsifying Properties of Bovine Lactoferrin in Food Emulsion System (식품 유화액 시스템에서 락토페린의 유화 특성)

  • Bae, Jae-Seok;Kim, Jeong-Won;Jeong, Yong-Seon;Lee, Eui-Seok;Hong, Soon-Taek
    • Journal of the Korean Applied Science and Technology
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    • v.30 no.4
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    • pp.779-789
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    • 2013
  • This study aimed to investigate the emulsifying properties of bovine lactoferrin in food emulsion system. First, lactoferrin solution was prepared to study its surface activities, such as surface adsorption characteristics and ${\zeta}$-potential. Second, some physicochemical properties of lactoferrin emulsion which resulted from variations of environmental conditions (i.e., pH or NaCl addition) were determined. As for surface adsorption characteristics evaluated by surface tension, it was decreased with increasing lactoferrin concentration in solution ($1{\times}10^{-5}{\rightarrow}0.2wt%$) and showed a plateau (${\fallingdotseq}44$mN/m) above 0.01 wt%. It was also changed with pH and the minimum value of 53.8 mM/m was observed at pI of lactoferrin. This was related to changes in ${\zeta}$-potential of the lactoferrin solution with respect to pH. Fat globule size of lactoferrin emulsion was decreased with increasing lactoferrin concentration and a stable emulsion was formed above 0.5 wt% lactoferrin in emulsion with fat globule size $d_{32}$ of ca. 0.33 ${\mu}m$ as confirmed by creaming stability experiment (i.e., Turbiscan). As with surface tension, fat globule size of lactoferrin emulsion also changed with pH and showed a maximum value at pI. As evaluated by Turbiscan, in the presence of NaCl, the lactoferrin emulsion showed instability in particular above 10 mM.

Photosynthetic Characteristics and Cell Quota of Nitrogen and Phosphorus in Scenedesmus quadricauda under P Limitation (인제한에 따른 Scenedesmus quadricauda의 광합성 특성 및 질소, 이 함량 변화)

  • Ahn, Chi-Yong;Kim, Hee-Sik;Yoon, Byung-Dae;Oh, Hee-Mock
    • ALGAE
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    • v.17 no.2
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    • pp.83-87
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    • 2002
  • Photosynthetic parameters of Scendesmus quadricauda, such as the maximum photosynthetic rate ($P_{max}$), photosynthetic efficiency (α) and the initial saturation intensity of irradiance for photosynthesis ($I_K$) were obtained using photosynthesis-irradiance (P-I) curve in a phosphorus-limited chemostat. S. quadricauda exhibitied no photoinhibition until at 200 μmol·$m^{-2}$ . $P_{max}$ (r=0.963, P=0.002) and $I_K$(r=0.904, P=0.013) showed linear relationships with growth rate. Chlorophyll-α concentration and cell dry weight decreased at higher growth rates, ut chlorophyll-α content per cell dry weight increased. The increase in photosynthetic rates at higher growth rates was due to the increase of $P_{max}$ and $I_K$ which was caused mainly by the increase in the absolute amount of chlorophyll-α rather than the increased photosynthetic efficiency of individual chlorphyll-α. The α did not show a significant relationship with growth rate (r=0.714, P=0.111). The cell quota of carbon (r=0.554, P=0.254) was not correlated with growth rate, but cell quota of nitrogen (r=0.818, P=0.047) and phosphorus (r=0.855, P=0.030) exhibited linear correlations with growth rate.

Advanced C.I.P Method to Use the Steel-Casing with Inner Joint (조인트 부착 강관 케이싱을 이용한 개량형 C.I.P 공법)

  • Jang, Seoyong;Choi, Jaesoon;Song, Byungwoong;Choi, Yoonyoung;Yoon, Joongsan
    • Journal of the Korean GEO-environmental Society
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    • v.13 no.2
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    • pp.95-102
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    • 2012
  • In this study, practical verifications for an advanced C.I.P(Cast in Place Pile) construction method were carried out. The structural characteristics of the method is to attach an angular joint in the steel-casing. This joint plays an important role in boring vertically, connected pile to pile, and protects the permeation of the ground water. For verifications, experimental research and numerical analysis were performed. In the experimental research, two model-tests were set up with the real scale steel-casing. One is to examine the leakage in the joint of piles and the other is to compare earth pressures in the front and the joint, respectively. In addition, 3 point bending test and compressive loading test were carried out and numerical analysis was performed to simulate the loading test. As a result of model-tests, the leakage in the pile joints was not shown up to 300 KPa of water pressure and stress concentration in the joint is out of the question. From the results of bending and compressive test, it was found that the new advanced C.I.P method is more convenient and superior than the conventional method.