• Journal of Life Science
• /
• v.26 no.5
• /
• pp.519-530
• /
• 2016

Vegetative plants in Yakutia are naturally frozen when they are covered with snow in the fall, and they function as green cryo-fodder that is a source of biologically active substances and nutrients for herbivorous animals. We observed a considerable increase in the total fatty acid content in the leaves of Avena sativa, Elytrigia rеpens, Equisetum variegatum and Equisetum scirpoides during the fall period. However, the degree of unsaturation of fatty acids was not higher in the frozen plants covered with snow than in the summer plants, with the exception of E. scirpoides, a dwarf horsetail found in the Pole of Cold in the northern hemisphere. In the internal adipose tissue of the Yakut horse (young horse meat), 18 fatty acids were found, including 10 saturated ones. Monounsaturated oleic С18:1 (n-9) acid and polyunsaturated α-linolenic С18:3 (n-3) acid were equally prevalent among the unsaturated fatty acids, accounting for 70% of the total unsaturated fatty acids. This composition of polyenoic fatty acids in the internal adipose tissue indicates that the Yakut horse actively feeds on the fall vegetation and the wintergreen sedge-grass. We believe that the high plant-specific free fatty acid content in the tissue of Yakut horses may play an important role in the regulation of their resistance to long-term low-temperature stress.

• Microbiology and Biotechnology Letters
• /
• v.30 no.3
• /
• pp.216-222
• /
• 2002

To Produce the modified Cheongiu that has high ethanol content, an ethanol-tolerant strain Saccharo-myces cerevislae SE2l1 was screened from Saccharomyces cerevisiae Kyokai No. 10 strain. The isolate showed faster growth than in the medium containing 10% ethanol compared with original strain. The isolate produced a higher concentration of ethanol and showed higher resistance to ethanol, high osmolarity and heat than the original strain. The analyses of yeast membrane components indicated that there were no significant changes in composition of sterols and phospholipids between the isolated and the original strain. However, during the fermentation, the iso-lated strain could change the fatty acid composition in the membrane more rapidly in the direction of decreasing membrane unsaturation and accumulate more trehalose in the cell than the original strain. These data suggest that the ability to change its membrane fatty acid composition and to accumulate trehalose may make the isolated strain easily adapt to changes in external condition.

• Korean Journal of Microbiology
• /
• v.50 no.3
• /
• pp.233-238
• /
• 2014

For the collection of starters suitable for the brewing of traditional liquor, an alcohol-resistant strain of lactic acid bacteria with low level of acid production was isolated from traditional fermented soybean lumps. The strain named as JBE 30 was identified as Lactobacillus brevis by 16S rRNA sequence analysis and additional biochemical tests. The strain could grow well at a MRS medium containing 8% (v/v) ethanol for 96 h of cultivation at $30^{\circ}C$. The final pH after cultivation was 4.5. It also inhibited the growth of food spoilage and pathogenic bacteria including Escherichia coli, Bacillus cereus, Listeria monocytogenes, Staphylococcus aureus, Micrococcus luteus, and Pseudomonas aeruginosa. These results showed that Lactobacillus brevis JBE 30 could be used as a promising starter in brewing process of traditional liquor.

• Journal of Oral Medicine and Pain
• /
• v.31 no.1
• /
• pp.17-25
• /
• 2006

The present study was undertaken to determine the possible cellular mechanism of action of angiopoietin-2 in bone metabolism. The effects on the osteoblasts were determined by measuring 1) cell viability, 2) alkaline phosphatase (ALP) activity, 3) gelatinase activity, and 4) nitric oxide production. The effects on the osteoclasts were investigated by measuring 1) tartrate-resistant acid phosphatase (TRAP)(+) multinucleated cells (MNCs) formation, and 2) resorption areas after culturing osteoclast precursors. Angiopoietin-2 treatment showed a significant increase in both the viability and ALP activity of osteoblasts. Angiopoietin-2 increased the activity of gelatinase and nitric oxide production. In addition, angiopoietin-2 decreased the osteoclast generation induced by macrophage-colony stimulating factor (M-CSF) and receptor activator of NF-kB ligand (RANKL), and inhibited osteoclastic activity in (M-CSF)-dependent bone marrow macrophage (MDBM) cell cultures. Taken these results, angiopoietin-2 may be a regulatory protein within the bone marrow microenvironment.

• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.34 no.2
• /
• pp.55-60
• /
• 2024

Two-dimensional (2D) RuO₂ nanosheets with nanometer thickness were synthesized using a chemical exfoliation method. The synthesized 2D-RuO₂ was hybridized with Ag-nanowire (NW), which is attracting attention as a next-generation transparent electrode material. After coating Ag-NW on the substrate, 2D-RuO₂ was subsequently coated on the Ag-NW. Although there was a decrease in optical transmittance, the hybridization of 2D-RuO₂ confirmed the effect of reducing sheet resistance. Furthermore, the flexibility of the fabricated transparent electrodes was also studied. It was confirmed by the change in sheet resistance after bending. The additional coating of 2D-RuO₂ improved the flexibility of the transparent electrodes.

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.5 no.2
• /
• pp.137-143
• /
• 2017

There has been a number of research on concrete durability. specially, as a research on chemical ingression, the research on the degradation against acid, alkali, and sulfate has been conducted. On the other hand, for the research on oils, especially, the influence of various oils on cement mortar with Supplementary Cementitious Materials(SCMs) is not sufficiently studied. hence, in this research, the degradation of cement mortar incorporated fly ash and blast furnace slag is researched when the cement mortar is submerged in various oils. For the result of experiment, as the content of fatty acid in the oils, the degradation of cement mortar with SCMs was occurred more, and the cement mortar with SCMs suffered more degradation than the ordinary portland cement regarding the oil submerging.

• Computational Structural Engineering
• /
• v.11 no.1
• /
• pp.27-37
• /
• 1998

본 고에서는 지진해석과 관련하여 가장 중요한 원칙과 해석법에 대한 개략을 제시하여 철근콘크리트 구조물의 지진해석과 관련된 용어 및 특수과제를 언급하고자 한다. 이 해석의 위력이나 매력적인 점에도 불구하고 지진응답에 대한 해석은 항상 많은 불확실성에 부닥칠 수 있다는 것을 강조하고자 한다. 해석은 설계과정의 한 단계에 불과하여 수많은 컴퓨터 출력 페이지가 빈틈없는(sound) 기술적 판단을 대신하여서는 안된다. 구조물에 있어서의 지진력은 외부에서 가해진 하중으로부터 발생하는 것이 아니다. 구조물에 압력 및 흡입력으로 작용하는 풍하중과는 달리, 구조물의 기저(base)에서의 주기적 운동에 의한 응답으로서 상부구조물은 가속도를 받게 되고 따라서 관성력으로서 지진력이 얻어지게 된다. 지진응답은 기본적으로 동적인 성질을 가지며 고유주기와 감쇠와 같은 동적 특성은 이 응답을 결정하는데 결정적인 역할을 한다. 만약 지진해석이 실제적인 것이 되자면, 단순화된 방식으로라도 이러한 동적 특성을 고려할 수 있는 것이어야 한다. 이러한 동적 성질이 복잡성의 한 요인이며, 다른 요인으로서 해석적 장애가 존재한다. 대부분의 구조물은 최대지진에 대하여 상당한 항복현상을 나타냄으로써 저항하도록 설계하고 있다. 따라서 설계자는 최대지진에 대한 구조물의 비선형 동적 거동에 대하여 어느 정도 이해를 하고 있어야 한다. 원칙적으로 이것은 매우 복잡하고 어려운 해석적 문제를 제기하게 된다. 실제로는 매우 단순화된 해석법, 적절한 설계 및 상세의 조합만으로도 만족스러운 거동을 얻는 것에 부족함이 없다. 어쨌든 이러한 해석기법의 바탕과 한계를 이해하는 것은 필수적이다.tidyl ethanolamine$(20.9{\sim}29.7%)$, phosphatidyl inositol$(18.4{\sim}26.1%)$ 순으로 많았다. 각 구성지질의 지방산조성은 4종의 버섯 공히 linoleic acid와 palmitic acid가 주요 지방산이었으나 싸리버섯은 중성지질에서 oleic acid의 함량이 높았다.n the part of special landscape management area, it is necessary to introduce landscape impact assessment system to more effective landscape management.ch served as supporting organizations. The control of the construction and management of the royal garden and landscape was held by decision makers, executors of works and management. 2) The general process of the construction and management of the royal garden and landscape included Sangji and Kyuho다 as the first step; In case of buildings and facilities, according to former examples and drawings, the most of the planning and design was already fixed.

• The Journal of the Korea Contents Association
• /
• v.19 no.2
• /
• pp.66-78
• /
• 2019

This study aimed to investigate the effects of scaffolding on creativity in Wiki-based collaborative learning. Wiki-based collaborative learning was implemented over three sessions among 67 sixth graders in an elementary school, and subjects were divided into three groups: Group 1 had a teachers' scaffolding and self-questioning script; Group 2 had a teachers' scaffolding; and Group 3, the control group, had no scaffolding. Results showed a significant difference in creativity among the groups with different types of scaffolding(Wilks' Lambda=.238, F=8.678, p < .001). Group 1, had significantly higher performance compared to the Group in creativity. However, when self-questoning script and a teachers' scaffolding were offered, self-scaffolding was not found to have a significant effect on learners' Originality of creativity. Group 2 showed higher performance in Originality of creativity when only a teachers' scaffolding was offered in the collaborative learning. The results of this study suggest that teachers' scaffolding and self-scaffolding have positive effects on creativity, but the need for a differentiated self-scaffolding strategy to identify the factors that influence creativity in wiki-based collaborative learning.

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.4 no.3
• /
• pp.307-315
• /
• 2016

The aim of this research is analyzing the fundamental properties and autogenous shrinkage reducing performance of 70 and 100MPa grade high performance concrete including emusified refined cooking oil(ERCO) under the mock-up conditions. As a results of experiment, the mixture contained 0.5% of ERCO showed slightly decreased slump flow while the slump was increased and segregation resistance performance was improved as 2.5 of EIS. For air content, all mixtures satisfied target air content with increased unit weight and delayed setting time with ERCO addition. In the case of compressive strength, when ERCO was added 0.5%, the result of approximately 5 to 10% of increased compressive strength was observed. For the autogenous shrinkage, ERCO contributed on 20-30% of shrinkage reducing performance comparing to Plain mixture without ERCO. It is considered that capillary pore filling action of soap particles occurred by the reaction of ERCO in cement paste between fatty aicd and calcium hydroxide contributed the shrinkage reducing performance. Based on these mock-up test results, application of the high performance concrete mixture with ERCO on CFT actual structure was decided.

• Journal of fish pathology
• /
• v.6 no.1
• /
• pp.1-10
• /
• 1993

Two vibrio sp. strains were isolated from disease catfish(silurus asotus). The present isolates were identified as Vibrio ordalii based on their biological and biochemical characteristics ; they were positive for acid production from glucose, Iactose, maltose, sucrose and salicine, while negative for arabinose, galactose, inocitol and xylose. They are named KL-1 and KL-2, KL-1 and KL-2 strains were similar to physiological characteristics ; growth was observed at pH 5 to 10 and in 0% to 6.0% NaCl. Two strains did not growth at a concentration above 7.0% NaCl and pH10. This bacterium was infected into health catfish hypodermically. Such injection was found to induce haemorrhagic ulcers very similar to those observed in naturally infected fish. At 24h post-infection, the red spot developed around the injection site and grew bigger to from a red sport area. At 120h post-infection, the muscle ncerosis was extended near the ventral fin. The seventy percent lethal dosage was appeared to water temperature at $25^{\circ}C$. Two strains were tested for drug senistiveity by plate method. KL-1 and KL-2 strains were sensitive to GM. K, N, S and SxT, but resistant to CF, L and VA.