• E2M - 전기 전자와 첨단 소재
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• 제1권2호
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• pp.149-151
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• 1988

전도성 유기물질은 저차원성에 유래한 전자적 거동, 전도기구 및 공학적 응용의 관점으로부터 흥미를 갖게 되어 이 분야의 연구가 현저하게 발전하고 있다. 따라서 본 연구에서는 Langmuir-Blodgett법을 위한 전도성 유기물질 합성의 일환으로 성막물질 합성의 중간체로 이용되는 LiTCNQ를 diethyl succinate를 출발물질로 사용하여 합성한 결과 총수율이 47.5%였다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2000년도 봄 한국섬유공학회 학술발표회 논문집(Proceedings of the Korean Textile Conference)
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• pp.261-264
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• 2000

• 수산해양기술연구
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• 제48권1호
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• pp.20-28
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• 2012

The monofilament with 0.304mm of diameter was produced using a polybutylene succinate (PBS) resin, and a gill net was made by it. We investigated the impact of heat setting temperature on the mechanical properties, knot state and height of gill net. Heat treatment was carried out using the high pressure steam machine for 20 minutes at temperature of $55^{\circ}C$, $60^{\circ}C$, $70^{\circ}C$ and $75^{\circ}C$. Before heat treatment, the strength and elongation of PBS monofilament were estimated to be $48.1kg/mm^2$, 23.8% at unknot, $37.6kg/mm^2$, 18.8% at single knot, $26.6kg/mm^2$, 22.9% at double knot in dry condition, respectively. The strength and elongation of PBS monofilament with double knot were decreased as heat setting temperature increased, and the decreasing rate of strength was showed to be higher than that of elongation. It was not found any differences in strength and elongation of PBS monofilament yarn with double knot at the $65^{\circ}C$ and $70^{\circ}C$ of heat setting temperature by 5% significance of T-test, but there was a significant difference at the $70^{\circ}C$ and $75^{\circ}C$ of heat setting temperature. The net's height and length from leg to leg appeared no differences at the $70^{\circ}C$ and $75^{\circ}C$ of heat setting temperature. In results, it was investigated that the PBS monofilament gill net with the maximized physical properties could be manufactured at $70^{\circ}C$ of heat setting temperature using a high pressure steam machine for 20 minutes.

• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 2003년도 정기총회 및 추계학술발표회
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• pp.100.1-100
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• 2003

A dctA gene encoding a protein with identity to a C4-dicarboxylate/H+ was cloned from a beneficial biocontrol bacterium, P. chororaphis O6. Expression of the dctA was induced in minimal medium by several organic acids and was repressed by glucose. Highest expression was observed in early-log cells grown on fumarate and succinate with decline as cells approached late-log phase. The dctA transcript accumulated weakly when cells were grown on malate but strong expression was observed with benzoate. Expression of the dctA transcript was repressed in early-log cells upon addition of glucose to fumarate, but was detected as the cell culture aged. A dctA-deficient mutant of O6, constructed by marker exchange mutagenesis, did not grow on minimal medium containing succinate, benzoate, or fumarate, and growth on malate was delayed. The dctA mutant and wild type grew equally on glucose. The dctA mutant on cucumber roots in sterilized potting soil was colonized at levels comparable to those of the wild type, but induction level of disease resistance by the mutant against target leaf spot disease was decreased. These results may indicate that the dctA is essential for utilization of certain organic acids and its expression is controlled by the availability of sugars. In addition, the dctA is not essenitial for cucumber root colonization, but important for induction of disease resistance.

• Applied Biological Chemistry
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• 제32권4호
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• pp.435-440
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• 1989

Alkaline protease를 생산하는 Bacillus subtilis를 $100{\mu}g/ml$ NTG 처리하여 $Arg^-,\;Try^-,\;His^-\;Ade^-$ 영양요구성주를 분리하였다. 원형질체 형성은 대수증식기의 균체를 lysozyme $200{\mu}g/ml$로 $42^{\circ}C$에서 $10{\sim}30$분간 처리하였을 때 약 99%였다. 재생배지에 0.3M sodium succinate, polyvinylpyrrolidone 2.0%, casamino acid 0.5%, $10mM\;MgCl_2$ 및 $20mM\;CaCl_2$를 첨가했을 때 재생율은 25.2% 였다. 원형질체 융합은 40%(w/v)의 PEG 6,000 용액을 상온에서 $1{\sim}5$분간 처리시 약 $2{\sim}8{\times}10^{-5}$의 융합빈도를 얻을 수 있었다.

• 한국동물학회지
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• 제28권4호
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• pp.257-278
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• 1985

Phenyalanine, tryptophan, tyrosine 과 같은 방향족 아미노산을 계배 초기에 투여하였을 때 somite 형성에 미치는 영향을 광학 및 전자현미경을 사용하여 형태적으로 추구한 결과 아미노산을 투여한 계배에서는 불완전한 체절 분절 현상이 일어나고 신경계에도 감쇠 영향을 미치며 somite의 발생이 불완전하고 그 크기도 다양하였다. 또한 체절 세포는 chromatin이 응축되고 미토콘드리아의 일부는 파괴되었고 핵이 변형된 경우도 있었다. 부란 24시간 후 아미노산을 투여하고 15일간 부란한 계배의 경우 단백질이나 핵산은 대조군에 비해 크게 저하되지는 않았으나 lactate dehydrogenase, succinate dehydrogenase, malate dehydrogenase 및 glucose 6-phosphate dehydrogenase와 같은 기초대사에 중요한 구실을 하는 효소활성은 크게 저하되었다. 이와 같은 실험결과로부터 초기계배에 아미노산을 투여하면 아마도 yolk granule의 분해가 지연되며 결과적으로 세포내의 아미노산 균형이 파괴되어 정상 대사가 이루어지지 못하여 비정상적인 체절형성의 현상이 나타나게 되는 것으로 생각된다.

• Journal of Microbiology and Biotechnology
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• 제18권6호
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• pp.1136-1140
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• 2008

The Rhodopseudomonas palustris KUGB306 hemA gene codes for 5-aminolevulinic acid (ALA) synthase. This enzyme catalyzes the condensation of glycine and succinyl-CoA to yield ALA in the presence of the cofactor pyridoxal 5'-phosphate. The R. palustris KUGB306 hemA gene in the pGEX-KG vector system was transformed into Escherichia coli BL21. The effects of physiological factors on the extracellular production of ALA by the recombinant E. coli were studied. Terrific Broth (TB) medium resulted in significantly higher cell growth and ALA production than did Luria-Bertani (LB) medium. ALA production was significantly enhanced by the addition of succinate together with glycine in the medium. Maximal ALA production (2.5 g/l) was observed upon the addition of D-glucose as an ALA dehydratase inhibitor in the late-log culture phase. Based on the results obtained from the shake-flask cultures, fermentation was carried out using the recombinant E. coli in TB medium, with the initial addition of 90 mM glycine and 120 mM succinate, and the addition of 45 mM D-glucose in the late-log phase. The extracellular production of ALA was also influenced by the pH of the culture broth. We maintained a pH of 6.5 in the fermenter throughout the culture process, achieving the maximal levels of extracellular ALA production (5.15 g/l, 39.3 mM).

• Journal of Yeungnam Medical Science
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• 제5권2호
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• pp.111-119
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• 1988

효소와 기계적인 힘을 이용하여 얻어진 심장세포를 심근세포와 내피세포를 분리하여 48시간 배양한 후 양군으로 나눠서 관찰하였다. 실험군은 배양중에 10% DMSO에 1시간 처리하였고 DMSO를 처리하지 않고 계속 배양한 것을 대조군으로 하였다. DMSO효과를 관찰하기 위하여 도립현미경하에서 세포의 형태, 수축능력, 증식 능력등을 관찰하였고, 심근세포에서는 succinate dehydrogenase 반응으로 사립체의 증감을 대조군과 비교하였고, 심장내과세포에서는 thiamine pyrophosphatase의 반응으로 Golgi의 양을 대조군으로 비교하였다. 실험 결과를 요약하연 다음과 같다. 1. DMSO에 의하여 심근세포는 분화된 형태로 모양이 길어졌고 사립체의 증가에 의해 succinate dehydrogenase의 반응이 대조군보마 강하게 나타났다. 2. DMSO에 의해 심근세포는 근세섬유의 파괴와 혼란이 초래되었고 이로 인하여 수축능력이 감소되었다. 3. 심장내과 세포는 DMSO에 의해 세포증식이 감소되고 고유기능이 강조되어 Golgi의 표지효소안 thiamine pyrophosphatase의 반응이 대조군보다 강하였다. 4. 심장내과세포는 DMSO의 세포접착력 소실과 운동성 소실작용에 의해 배양중 많은 세포의 손실이 초래되었다.

• Journal of Yeungnam Medical Science
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• 제6권2호
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• pp.133-140
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• 1989

초기배양과정에서 일어나는 간세포의 회복, 성장, 활동상황등을 추적하기 위하여 세포의 생존과 기능에 꼭 필요하고 서로 깊은 연관관계를 가진 골지체, 사립체, 생체막의 표지효소를 일령별로 추적 하였다. 골지체의 표지효소인 thiamine pyrophosphatase는 배양 4일경부터 장기 배양시의 강도에 접근하였으며 사립체의 표지효소인 succinate dehydrogenase는 시일이 지나며 강도가 감소하여 4일부터는 일정한 강도를 유지하였다. 형질막의 표지효소인 alkaline phosphatase은 2일째부터 반응강도가 강해져 5일째 이후로는 아주 강한반응을 보였다. 이같은 결과를 종합해볼때 1차 배양에 있어 간세포는 세포 분리후 4일경이 지나면서 안정상태에 접어들고 제 기능을 수행하나 배양 상태에서는 분비세포로서의 고유기능은 감소되는 것으로 사료된다.

• The Korean Journal of Physiology and Pharmacology
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• 제18권6호
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• pp.469-474
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• 2014

DWP208 is a sodium succinate form of ZYM-201 which is a triterpenoid glycoside isolated from Sanguisorba officinalis, a medicinal plant prescribed for various diseases, such as duodenal ulcers and bleeding in East Asian counties. We demonstrated that this compound is able to normalize the altered lipid metabolism induced by hyperglycemia and a high fat diet. In this study, we determined whether hyperlipidemic conditions induced with chronically treated alcohol can also be restored by DWP208. Similar to our previous results, orally administered DWP208 (1 to 10 mg/kg) also ameliorated the hyperlipidemia that was induced by alcohol. This compound reversed the alcohol-induced hyperlipidemia including (i) up-regulated hyperlipidemic parameters such as low-density lipoprotein (LDL), very low-density lipoprotein (VLDL), atherosclerotic index (AI), triglyceride, and total cholesterol, and (ii) down-regulated hyperlipidemic parameters such as absolute body weight, superoxide dismutase (SOD) activity, and high-density lipoprotein (HDL) in serum and liver. According to our data, the ameliorative activity of DWP208 is due to its indirect anti-oxidative activity as a result of which lipid peroxide and hydroxyl radical levels were reduced and the activity of SOD was enhanced. Therefore, our data strongly suggest that DWP208 can be used as a remedy against alcohol-induced hyperlipidemia.