• Title/Summary/Keyword: 내염성

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Study of Application of Salt Resistance Concrete Beam Reinforced with Glass Fiber Reinforced Polymer-Ribbed Bar as a Member of Marine Structure (GFRP 보강 내염성 콘크리트 보의 해양구조부재로서의 적용성 검토)

  • Kim, Chung-Ho;Hwang, Yun-Hee
    • Journal of Ocean Engineering and Technology
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    • v.22 no.5
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    • pp.94-99
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    • 2008
  • Three types of salt resistant concrete beams reinforced with glass fiber reinforced polymer-ribbed bars (GFRP-ribbed bars) were selected, and their applicable properties were investigated with the goal of improving the problem of capacity deterioration in marine structures due to sea water corrosion. In this study, the structural behaviors were similar to RC beams in relation to the development of the strength and stiffness up to the generation of the initial crack. After the growth of this initial crack, the structural properties decreased owing to a sudden loss of bond strength. Also these beams showed the trends of brittle failure. As a result, it was confirmed that a GFS beam replaced with Fly Ash (20%) and Silica Fume (5%) has the best application as a marine structural element.

Studies on the Osmophilic Red Color Yeast (1) Isolation and Identification of Sporobolomyces sp. (내염성 적색효모에 관한 연구 (제 1 보) Sporobolomyces 속의 분리 및 동정)

  • Lee, Taik-Soo;Yu, Ju-Hyun;Chu, Yong-Ha;O, Mahn-Jin
    • Korean Journal of Food Science and Technology
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    • v.2 no.2
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    • pp.26-29
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    • 1970
  • Four strains of Sporobolomyces genera were isolated from soy sauce mashes at the fermentating and aging periods and identified. Their salt-resistance and color formation were examined in order to improve the color density and nutrition of red pepper paste preparations. The results obtained were as follows; a) The strain L1, L2, L3 and L4 isolated were identified as Sporobolomyces gracilis, Sporobolomyces roseus, Sporobolomyes gracilis and Sporobolomyces roseus respectively. b) The yeasts isolated were grown on the media containing $0{\sim}10$ percent of sodium chloride but their growth were almost restrained on the media containing $15{\sim}18$ per cent of sodium chloride. And the strain L2 and L3 were more salt-resistant as compared with L1 and L4. c) The strain L3 were the best among the 4 strains of yeasts comparison with their salt-resistance, color and flavour formation.

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Physiological Changes of Saccharomyces cerevisiae by High Voltage Pulsed Electric Field Treatments (고전압 펄스 전기장 처리에 의한 Saccharomyces cerevisiae의 생리적 변화)

  • Park, Hee Ran;Yoon, So Jung;Park, Han-Sul;Shin, Jung-Kue
    • Korean Journal of Food Science and Technology
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    • v.45 no.5
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    • pp.590-597
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    • 2013
  • High voltage pulsed electric fields (PEF) treatment is a promising non-thermal processing technology that can replace or partially substitute for thermal processes. The aim of this research was to investigate the microbial inactivation mechanisms by PEF treatment in terms of physiological changes to Saccharomyces cerevisiae. PEF was applied at the electric field strength of 50 kV/cm, treatment time of 56 ${\mu}s$ and temperature of $40^{\circ}C$. The microbial cells treated with PEF showed loss of salt tolerance on the cell membrane and collapse of the relative pH gradient on in-out of cells. Cell death or injury resulted from the breakdown of homeostasis, decreased $H^+$-ATPase activity, and loss of glycolysis activity.

Evaluation of Salt-Tolerance Plant for Improving Saline Soil of Reclaimed Land (간척지 토양개량을 위한 내염성 식물의 활용성 평가)

  • Lee, Kyeong-Bo;Kang, Jong-Gook;Li, Jumei;Lee, Deog-Bae;Park, Chan-Won;Kim, Jae-Duk
    • Korean Journal of Soil Science and Fertilizer
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    • v.40 no.3
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    • pp.173-180
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    • 2007
  • Reclaimed tidal area is a great agricultural resource in the world. Improvement and utilization of reclaimed soil is an important measure for expanding land resource. This study was conducted to evaluate relative salt-tolerance of plants and its effect for improving saline soil. Eighteen tolerance plants were selected from China, Pakistan and Korea the climate of which is different. The emergence of different varieties in reclaimed soil was in order as FL478>Barnyard grass>Pokkali>Atriplex>Sesbania>Rumex>Alfalfa>Tall Fescue>Ryegrass>Sudan grass. Four varieties, Barnyard grass, Sesbania, Atriplex and Limonium were selected for soil improvement in reclaimed land. Cultivation of Sesbania, Barnyard grass and Atriplex were good to soil physico-chemical quality. Also these plants increased soil organic matter contents and reduced soil salt concentration. Organic matter contents of cultivated soils of Sesbania, Barnyard grass and Atriplex were $4.10g\;kg^{-1}$, $4.60g\;kg^{-1}$ and $2.81g\;kg^{-1}$ respectively. On the other hand organic matter content of uncultivated soils was $2.65g\;kg^{-1}$. As Sesbania and Barnyard grass were applied to cultivated soil like green manure, bulk density improved from $1.42Mg\;m^{-3}$ to $1.39Mg\;m^{-3}$.

Study on the Salt Tolerance of Rice and Other Crops in Reclaimed 2. On the Salt Tolerance of Chinese Cabbage and Cabbage in Various Salty Conditions (간척지에서 수도 및 기타작물의 내염성에 관한 연구 2. 여러 가지 염분조건에서 배추와 양배추의 내염성에 관하여)

  • 임형빈
    • Journal of Plant Biology
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    • v.12 no.3
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    • pp.8-14
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    • 1969
  • Salt tolerances of Chinese cabbage and cabbage were observed by means of the sand culture and field experiment. The point of 50% yield reduction of Chinese Cabbage was 1% of salt concentration in sand culture. The Na absorption in the salty upland conditions was increased but the absorption of Ca, Mg were interrupted as the salt concentration was raised and there were no differences in the absorption of N and P. The Si absorption was increased at low salty conditions, but the salt concentration was raised, the absorption was interrupted drastically. The cabbage was more stronger salt tolerance than Chinese cabbage, and it was possible to prevent the salt damage significantly by planting on sloping beds instead of planting on the double-row beds in field condition.

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Surface Modification of Reverse Osmosis Membrane with Diphenylamine for Improved Chlorine and Fouling Resistance (Diphenylamine에 의해 표면개질된 역삼투막의 내염소성 및 내오염성 향상)

  • Kwon, Sei;Jee, Ki Yong;Lee, Yong Taek
    • Membrane Journal
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    • v.23 no.6
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    • pp.439-449
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    • 2013
  • This study investigated the aromatic polyamide reverse osmosis membrane was modified with diphenylamine (DPA) for enhanced chlorine and fouling resistance and how to optimize. DPA has high reactivity and thermo chemical stability. The performance of a modified membranes was investigated and its surface analyzed using atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and contact angle measurement. The experiment was conducted while changing the conditions of temperature and DPA solution concentration.

Low temperature and Salt Tolerances of Native Zoysiagrass (Zoysia spp.) Collected in South Korea (국내 자생 한국잔디류의 내한성 및 내염성 조사)

  • Choi, Joon-Soo;Yang, Geun-Mo
    • Asian Journal of Turfgrass Science
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    • v.25 no.2
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    • pp.138-146
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    • 2011
  • This study was carried out to select salt tolerant zoysiagrass breeding lines. Eighty two native zoysiagrasses collected from S. Korea were used in this study. Saline water were prepared by mixing sea water and tap water. ECw levels of saline water treated ranged from 2 to $3dS{\cdot}m^{-1}$. Zoysiagrass planted in pot by sprigging were soaked into the plastic box containing saline water. Winter injury was investigated under the pot condition. Most of Z. japonica types did not show winter injury. But Z. tenuifolia type, Z. matrella type, and Z. sinica type showed winter injury under the pot condition at Cheonan area. NaCl level in soil was increased from 0% to 0.51% by treatment of saline water. Soil ECe measurement showed upto $170dS{\cdot}m^{-1}$. Z. tenuifolia type (Z5034), Z. matrella type ('Konhee', Z4109, 'Semill'), Z. japonica type (Z1055, Z1040, Z1008, 'Zenith', 'Millock') and medium leaf type zoysiagrass (Z6096, Z6118, Z6021, Z6074) resulted in below 30% leaf firing under the saline condition. This approach might be useful for selecting salt tolerant breeding lines.

Optimal Conditions for the Production of Salt-tolerant Protease from Aspergillus sp. 101 and Its Characteristics (Aspergillus sp. 101로부터 내염성 단백분해효소 생산을 위한 최적 조건 및 특성)

  • Hwang, Joo-Yeon;Choi, Seung-Hwa;Lee, Si-Kyung;Kim, Sang-Moo
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.38 no.11
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    • pp.1612-1617
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    • 2009
  • Aspergillus sp. 101 was isolated from the Korean traditional soybean paste for the production of a salt-tolerant protease. The optimal condition for the production of a salt-tolerant protease was determined with various energy sources such as carbon, nitrogen, and protein, and at different culture conditions such as temperature, pH, incubation time and NaCl concentration. The most favorable organic nitrogen sources were 2% defatted soybean flour (DSF) and soy protein isolate (SPI). Optimal pH and temperature were pH 6.0 and $25{\sim}27^{\circ}C$, respectively. Therefore, Aspergillus sp. 101 protease was a mild acid (or neutral) protease. Protease production was the highest at 0.1% concentration of $CaCO_3,\;K_2HPO_4$ and Arabicgum. Aspergillus sp. 101 could grow in culture medium at 15% NaCl concentration and produce a salt-tolerant protease even at 7% NaCl. The cell mass and protease activity of Aspergillus sp. 101 cultured in a modified medium was comparatively higher in Czapek dox and protease producing media. Hence, Aspergillus sp. 101 protease can be utilized in soy or fish sauce industry as a salt-tolerant protease starter.