• Title/Summary/Keyword: 재조절

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Immature Pollen-Derived Plant Regeneration in Anther Cultures of Ranunculus japonicus Thunb (미나리아재비(Ranuculus japonicus Thunb.)의 약배양에 의한 미숙 화분 유래의 식물체 재분화)

  • 고정애;김영선;김명준;은종선
    • Korean Journal of Plant Tissue Culture
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    • v.21 no.5
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    • pp.293-297
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    • 1994
  • In order to induce immature pollen derived plants, anthers of Ranunculus japonicus Thunb. were cultured on Murashige and Skoog's medium supplemented with various combinations of auxins and cytokinins. The combinations of NAA and BA were more effective than those of 2,4-D and kinetin in the formation of calli and embryos. Up to 5t5% of the anthers cultured on medium containing 0.5 mg/L NAA and 1.0 mg/L BA gave rise to plantlets. The most suitable stage for anther culture in the induction of calli and/or embryos from immature pollens was at the uninucleate and early binucleate stage (3 days before anthesis). Immature pollens developed into embryos by repeated division of the vegetative nucleate after 60days of culture.

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Low frequency sound absorption improvement in refrigerator using multi perforated plate (다공판을 활용한 냉장고 저주파 흡음개선)

  • Ho-Jin, Kwon;Hyoung-Jin, Kim;Kyungjun, Song;Tae-hoon, Kim;Junhyo, Koo
    • The Journal of the Acoustical Society of Korea
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    • v.41 no.6
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    • pp.723-729
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    • 2022
  • In this study, the multi perforated plate is used to reduce the compressor noise in the low frequency band inside the refrigerator machine room. To predict the sound absorption results, the impedance of the sound absorption material is measured. Using the measured impedance results, it is confirmed that the results used for FEM analysis is almost similar to the experimental values. The sound-absorbing structure that can operate in the target frequency band inside the refrigerator machine room is designed by controlling the hole diameter and arrangement in the perforated plate. The effect of reducing noise in the low frequency band is confirmed by applying perforated plate-based sound absorbing structures to the machine room.

The Spring Metazooplankton Dynamics in the River-Reservoir Hybrid System (Nakdong River, Korea): Its Role in Controlling the Phytoplankton Biomass (강-저수지 복합형 시스템내 봄 동물플랑크톤의 역동성 (낙동강, 한국): 식물플랑크톤 생체량 조절자로서의 역할)

  • Chang, Kwang-Hyeon;Jeong, Kwang-Seuk;Joo, Gea-Jae;Kim, Hyun-Woo
    • Korean Journal of Ecology and Environment
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    • v.36 no.4 s.105
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    • pp.420-426
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    • 2003
  • During a three-year study (2000-2002), dramatic changes in the phytoplankton biomass and high transparency were repeatedly observed during mid-spring in the lower part of the Nakdong River. Rotifers (Brachionus, Keratella, Polyarthra) , sharply increased toward the middle and end of spring. As hydrologic retention time increased (to near 20 days) and water temperature increased from 10C to > 20C toward the end of spring, small cladocerans noticeably increased. Once phytoplankton biomass passed their peak stage in the mid-spring, a short period (one or two weeks) of relatively low phytoplankton biomass and high Secchi transparencies occurred. Grazing by the zooplankton was highest in spring, thus, it seems that high grazing activities of zooplankton grazing regulated phytoplankton dynamics in the river. The results indicate that the role of zooplankton grazing in controlling the phytoplankton biomass becomes more important during the spring when river water is relatively stagnant.

An Effect of Work-Family Conflict on Turnover Intention and Organizational Commitment (직장-가정 갈등이 이직의도와 조직몰입에 미치는 영향에 관한 연구)

  • Lee, Byung-Jae;Jeong, Tae-Seok
    • Journal of Digital Convergence
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    • v.11 no.8
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    • pp.75-93
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    • 2013
  • The primary objective of this study is to investigate the factors that influence work-family conflict and to identify the relationships between the factors and organizational commitment and turnover intention. In addition, we investigate the moderating effect of need for achievement, need for power, and perceived organizational support on the relationships. The research results show that work-family conflict has significant and negative effect on organizational commitment. On the other hand, work-family conflict has significant and positive effect on turnover intention. Need for achievement and need for power play a moderating role between work-family conflict and organizational commitment and work-family conflict and turnover intention. The conclusions and implications are discussed.

Effects of Growth Regulators on Callus Induction and Plant Regeneration from Leaf Explants of Sedum sarmentosum (돌나물 엽절편으로부텨 캘러스 형성 및 식물체 분화에 미치는 생장조절물질의 영향)

  • Ahn, Jeong-Ho;Lee, Seung-Yeob
    • Journal of Plant Biotechnology
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    • v.31 no.1
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    • pp.25-29
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    • 2004
  • To establish the system of in uitro plant regeneration, the leaf segments of Sedum sarmentosum were cultured on MS media supplemented with different levels of 2,4-D, NAA and BA. The callus induction and growth showed a good response on MS medium supplemented with 3.0mg/L 2,4-D and 1.0mg/L BA, but a few callus induced on medium containing NAA and BA. In plant regeneration, combination of BA and NAA promoted shoot organogenesis from callus, and the highest frequency was obtained on MS medium supplemented with 0.2mg/L NAA and 3.0mg/L BA. When calli were transferred to the plant regeneration medium containing 0.2mg/L NAA and 3.0mg/L BA, healthy shoots without hyperhydricity were continuously induced (17.2 plantlets per callus) after 50 days of culture. When regenerated plantlets were transferred onto hormone-free MS medium, rooting was easily achieved from all of them.

Hydrophobic and Hydrophilic PDMS Sponges Prepared Through Physicochemical Treatments (물리화학적 처리에 따른 PDMS 특성 조절)

  • Nam, Kyungmok;Park, Sungmin;Kim, Jonghun;Yoon, Sang-Hee
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.40 no.8
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    • pp.737-742
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    • 2016
  • An elastomer (especially PDMS) sponge is considered to be a promising selective absorber in cleaning up oil spills. The performance of a PDMS sponge in capturing and separating oil from (sea) water depends on several parameters such as surface roughness, physicochemical treatments, and hydrostatic stability. Here, we first present a method of fabricating the PDMS sponges having numerous micro-sized pores that act as absorption and storage spaces for the target material, and then we report an experimental effort undertaken to control the surface physicochemistry (i.e., hydrophobicity or hydrophilicity) of the PDMS sponges by adjusting the size of the pores and the concentration of the surfactant (i.e., silwet L-77). From the experimental results, we develop an in-depth understanding of the mechanism for controlling the surface physicochemistry of PDMS using water-soluble micro-sized particles and a surfactant. The surface energy and absorbing behavior of the PDMS sponges are also extensively discussed.

A study on the Influence of Logistic Performance with Factors of Choosing the Third Party Logistics company : Focused on the Using Regulation effect of Logistics Performance (제3자물류기업 선정요인이 물류성과에 미치는 영향에 관한 연구 : 물류환경요인에 의한 조절효과를 중심으로)

  • Choi, Sang-Chon;Chung, Jung-Chae;Yeon, Je-Eun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.3
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    • pp.1506-1514
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    • 2014
  • The study is aiming to shed light on not only the influence of logistics output by choosing the third party logistics as the using of third party logistics has been increasing by the manufacturing firms also look over the effect between the factor of third party logistics' choosing and logistics performance in accordance with the changing of the logistics environment. As a result of the study, both service and fame factor among the third party logistics choosing factors have a significant impact on the logistics performance, furthermore the service factor of the logistics environment has an influence on the logistics performance by customer factor after measuring the control effect, and the fame factor has an influence on the logistics performance by both globaliztion and information system factor.

The Moderating Effect of Economic Support from Children in the Relationship of Total Cost of Living on Depression among the Korean Elderly (노인의 생활비가 우울에 미치는 영향 -비동거 자녀로부터 경제적 지원의 조절효과-)

  • Chang, Cin-Jae
    • Journal of the Korea Convergence Society
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    • v.8 no.4
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    • pp.239-245
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    • 2017
  • The purpose of the study is to examine the effects of economic factors on depression among the Korean Elderly. In detail, this study is convergence study conducted to understand the moderating effect of economic support from children in the relationship of total cost of living and Depression. For this purpose, this study used the 3,392 Korean elderly from 2015 Korean Welfare Panel Data. As a results, total cost of living of the elderly had a significant effect on depression. Also, the relationship between total cost of living and depression among the elderly was buffered by economic support from children. In other words, the higher economic support from children, the less negative effect of total cost of living on depression. Based on the results, this study discussed that economic factors should be considered as a major factor to reduce depression of the elderly.

Analysis of quaternary structure of leucine-responsive regulatory protein (Lrp) by crosslink experiments (교차결합 실험을 통한 루신 대응 조절 단백질의 4차 구조 분석)

  • Lee, Euiho;Pokoo, Robert;Nguyen, Loi Thuan;Lee, Chan Yong
    • Korean Journal of Microbiology
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    • v.53 no.4
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    • pp.297-303
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    • 2017
  • Leucine-responsive regulatory protein (LRP) is a regulatory protein of molecular weight 18.8 kDa and is widely known to regulate many metabolic and functional activities of operons in Escherichia coli. The gene for Lrp from Escherichia coli in pQE system of 6 × His-tagging was expressed and 3H-labeled protein, as well as the wild type Lrp, was purified. The crosslink experiments were performed to analyze the quaternary structure of Lrp at high of 5μM and at low concentrations below 0.3μM with cross linkers, such as glutaraldehyde, 1, 2, 3, 4-diepoxy-butane (DEB), and ethylene glycol bis (succinimidyl succinate) (EGS). In the experiments, we found that the Lrp protein can be formed higher conformation states of tetramer, hexamer, octamer, as well as dimeric state when incubated with the above cross linkers.

Inhibitory Effect of Osteoclastogenesis and Estradiol Activity of Myelophycus simplex Extract (바위수염 추출물의 파골세포 분화 억제 및 에스트라디올 활성 평가)

  • Ha, Hyun Joo;Lim, Hyung Jin;Kim, Min Gyeong;Bak, Seon Gyeong;Rho, Mun-Chual;Cheong, Sun Hee;Lee, Seung-Jae;Lee, Sang-Hoon
    • Journal of Marine Bioscience and Biotechnology
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    • v.12 no.2
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    • pp.75-80
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    • 2020
  • In the present study, the estrogenic activity and anti-osteoclastogenic activity of the Myelophycus simplex extract were evaluated using T47D-Kbluc cells and bone marrow-derived macrophages (BMMs). As a result of the measurement of the estrogenic activity in the T47D-Kbluc cell line, the Myelophycus simplex extract showed increased estrogenic activity in a dose-dependent manner in association with its concentration. To confirm the regulatory effect of the Myelophycus simplex extract on the estrogen-responsive gene, the Myelophycus simplex extract showed a similar tendency to estradiol: the expression of estrogen receptor 1 (ESR1) was significantly decreased while the expression of estrogen receptor 2 (ESR2) was increased. Furthermore, the Myelophycus simplex extract exhibited an inhibitory effect on osteoclast differentiation. In conclusion, these Myelophycus simplex extracts might be regarded as candidates for further studies or the development of functional food products or medicine to prevent or avoid postmenopausal symptoms for women.