• 아시안잔디학회지
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• 제9권4호
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• pp.331-342
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• 1995

An investigation was performed to reveal the removal rates of organic constituents of the litters in a Phragmithea longivalvis grassland in a Delta of the Nakdong River, The removal rates of the inorganic and organic materials are determined by the mathematical models. The removal rates and time required to decay up to a percentage of each organic constituent were calculated using these new models. The removal rates of cold water soluble fractions, other carbohydrates, hot water soluble fractions, cellulose, crude fat, lignin and crude protein were 2.67, 1.39, 1.25, 1.02, 0.92, 0.49 and 0.47, respectively, The periods required to reach half time to the steady state of the removal and accumulation for cold water soluble fractions, other carbohydrates, hot water soluble fractions, cellulose, crude fat, lignin and crude protein of the litter were 0.26, 0.50, 0.55, 0.68, 0.75, 1.41 and 1.48 years, respectively.

• 한국전기전자재료학회논문지
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• 제24권3호
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• pp.245-249
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• 2011

Carbon nanotubes (CNTs) have been significantly used for the field emitters for display applications. However, the lifetime of CNT emitters which are formed by screen printing technique is not guaranteed yet, because the constituents in CNT paste affect the lifetime of CNTs. The CNT pastes for screen printing are normally composed of organic vehicles (nitro cellulose, ethyl cellulose, etc) and additives (glass frits, indium tin oxide (ITO), etc) with CNTs. In this study, the effects of constituents in CNT pastes on the lifetime and emission characteristics of CNTs were investigated by thermal and electrical analysis. Use of glass frits worsened the lifetime and electron emission of CNTs. However, an addition of ITO to CNT paste rather improved the lifetime of CNTs. Degradation of CNTs was small when nitro cellulose was used in CNT paste as an organic vehicle.

• Natural Product Sciences
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• 제16권1호
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• pp.32-38
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• 2010

From the polar fractions of a 70% EtOH extract of the flower buds of Lonicera japonica (Caprifoliaceae), ten constituents were isolated and identified as iridoid glycosides 7-dehydrologanin (7-ketologanin, 2), secologanin dimethyl acetal (3), (E)-aldosecologanin (centauroside, 5), dimethyl secologanoside (6), secoxyloganin (7) and epivogeloside (8). Other identified constituents were 1-O-$\beta$-D-glucopyranosyl-(2S,3S,4R,8E/Z)-2-[(2R)-2-hydroxy(docosanoyl, tricosanoyl, tetracosanoyl, pentacosanoyl)amino]-8-octadecene-1,3,4-triol (1), uracil (4), D-mannitol (9), and sucrose (10). Among them, 1, 2, 4, and 10 were isolated for the first time from this plant.

• Biomolecules & Therapeutics
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• 제25권2호
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• pp.91-104
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• 2017

Acute bronchitis and chronic obstructive pulmonary diseases (COPD) are essentially lung inflammatory disorders. Various plant extracts and their constituents showed therapeutic effects on several animal models of lung inflammation. These include coumarins, flavonoids, phenolics, iridoids, monoterpenes, diterpenes and triterpenoids. Some of them exerted inhibitory action mainly by inhibiting the mitogen-activated protein kinase pathway and nuclear transcription $factor-{\kappa}B$ activation. Especially, many flavonoid derivatives distinctly showed effectiveness on lung inflammation. In this review, the experimental data for plant extracts and their constituents showing therapeutic effectiveness on animal models of lung inflammation are summarized.

• Archives of Pharmacal Research
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• 제18권2호
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• pp.133-135
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• 1995

Previously, we reported that the n-butanol fraction of Lonicera japonica showed anti-flammatory activity in mice and rats. Several constituents such a loniceroside A and B, flavonoids and iridoids were isolated from this fraction. In this investigation, the anti-inflammatory activity of the major constituents of L. japonica was studied. Loniceroside A, lonicerin and loganin showed anti-inflammatory activity comparable to aspirin.

• 생약학회지
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• 제52권3호
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• pp.157-162
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• 2021

The heat-mediated reflux apparatus extraction of Paeonia lactiflora Pall. has been widely used as a traditional extraction method. In this paper, the microwave apparatus extraction method of Paeonia Radix was performed and the active ingredients and functional constituents were compared with the reference extraction method. The most effective extraction condition of albiflorin using the microwave was 120℃ in 50% methanol, and paeoniflorin was maximally extracted at 60℃. The reduced level of paeoniflorin molecule at high-pressure and high-temperature extraction condition was caused by the molecular instability. Additionally, the microwave extraction of 50% methanol extracts at 150℃ showed the highest functional constituents determined by in vitro DPPH radical scavenging activity, polyphenol concentration, and tyrosinase inhibition assay. The microwave apparatus was adapted as a rapid, low-cost, and environmentally friendly method to extract active ingredients and the practical extraction conditions of Paeonia Radix can be used in industrial applications.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.375.1-375.1
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• 2002

As part of a research program on the bioactive terpene constituents of Korean compositae plants. we have investigated Cacalia koraiensis (compositae). collected from Gangwon Province on August 2001. On reviewing the literatures of this species. triterpenes and pyrrolizidine alkaloids were isolated and some pharmacological activities were investigated. This species have been used for tinea and spasmolysis However. chemical constituents of this plant have not been reported. (omitted)

• 한국초지조사료학회지
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• 제5권2호
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• pp.127-135
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• 1985

옥수수 및 sorghum 식물(植物)에 있어서 생육시기(生育時期)와 환경온도(環境溫度)가 cell-wall constituents의 합성(合成) 및 축적형태(蓄積形態)에 미치는 영향(影響)을 구명(究明)하기 위하여 옥수수의 Blizzard와 sorghum의 Sioux 및 Pioneer 931 품종(品種)을 공시재료(供試材料)로 하여 포장(圃場) 및 Phytotron 시험(試驗)을 실시(實施)하였다. Phytotron의 주(晝)/야간(夜間) 실내온도(室內溫度)는 30/25, 25/20, 28/18 및 $18/8^{\circ}C$로 하였으며 일조(日照)는 30,000-35,000Lux로 13시간(時間) 조사(照謝)하였다. 1979-81년간(年間) 얻어진 결과(結果)를 요약(要約)하면 다음과 같다. 1. 옥수수 및 sorghum의 cell wall constituents는 유수형성기(幼穗形成期)에서 지엽(止葉)이 출현(出現)되는 시기(時期)에 최대(最大)의 합성능력(合成能力)을 갖는다. Neutral Detergence Fiber 및 Acid Detergence Fiber 농도(濃度)는 동화엽면적(同化葉面積)이 최대(最大)인 출수기전후(出穗期前后)에 각각(各各) NDF 52-55% (옥수수) 및 64-68%(Sorghum)와 ADF 30%(옥수수) 및 45% (Sorghum)로 가장 높은 수준(水準)을 나타낸다. 2 Cellulose 및 Hemicellulose는 세포구조막(細胞救造膜)을 형성(形成)하고 있는 structural carbohydrates로 Cellulose가 주(主)로 경조직(莖組織)의 cell wall을 구성(構成)하고 있는데 비해 Hemicellulose는 엽(葉)과 곡실부위(穀實部位)의 세포막구성물질(細胞膜構成物質)로서 중요(重要)한 역할(役割)을 한다. 3. Cell wall constituents의 합성(合成)은 환경온도(環境溫度)가 상승(上昇)됨에 따라 비례적(比例的)으로 증가(增加)한다. 그러나 fructosan, mono- 및 disaccharose 등 non-structural carbohydrates축적(蓄積)은 $30/25^{\circ}C$이상(以上)의 고온(高溫)에서 감소(減少)된다. 고온(高溫)에서의 세포구조막물질(細胞構造膜物質) 증가(增加)는 cell wall을 구성(構成)하고 있는 물질중(物質中) 特(特)히 Cellulose가 급증(急增)된데 기인(其因)된 것으로 온도상승(溫度上昇)에 따른 Cellulose의 합성능력(合成能力)은 Hemicellulose 및 Lignin에 비해 현저(顯著)한 증가(增加)를 보인다. 4 세포구조막물질(細胞構造膜物質)의 증가(增加)는 소화율(消化率) 및 net energy 축적(蓄積)을 크게 저해(沮害)한다. cell wall constituents 중(中) phenol 성분(成分)의 Lignin과 in vitro 소화율간(消化率間)에는 높은 부(負)의 상관(相關)이 있다($P{\leqq}0.1%$). Cellulose 및 Hemicellulose는 sorghum식물(植物)의 경우 소화율(消化率)과 NEL 축적(蓄積)을 크게 악화(惡化)시키나($P{\leqq}0.1%$) 옥수수에 있어서는 이같은 부(負)의 상관관계(相關關係)가 sorghum에서와 같이 크게 나타나지 않는다.

• Applied Biological Chemistry
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• 제51권3호
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• pp.233-237
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• 2008

우리나라의 자생식물인 털진달래(Rhododendon mucronulatum Turcz. var. ciliatum Nakai)지상부위로부터 정유를 얻고, 휘발성분을 headspace(HS)와 solid-phase microextraction(SPME)법으로 흡착시킨 다음 GC-MS로 분석하였다. 털진달래 정유에는 탄화수소 15종, 알코올 3종, 아세테이트 1종 등 총 19종의 화학성분이 함유되어 있었으며, 다함량 성분은 2-${\beta}$-pinene(16.1%), camphene(11.9%), ${\delta}$-3-carene(11.4%), d,l-limonene(9.5%), and ${\gamma}$-terpinene(9.5%)이었다. SPME법으로 흡착된 시료에는 탄화수소 13종, 알코올 1종, 질소화합물 1종 등 총 17종의 휘발성 화학물질이 함유되어 있었고, 이들 중 다함량 성분은 camphene(19.6%), 2-${\beta}$-pinene(18.0%), ${\delta}$-3-carene(17.4%), timethyl hydrazine(9.7%), ${\gamma}$-terpinene(8.5%), and d,l-limonene(5.5%)이었다. 그리고 HS법으로 흡착된 시료에는 탄화수소 11종, 알코올 1종, 질소화합물 1종 등 총 13종의 휘발성 화학물질이 함유되어 있었으며, 이들 중 다함량 성분은 camphene(25.8%), ${\delta}$-3-carene(24.8%), 2-${\beta}$-pinene(20.2%), d,l-limonene(5.4%), tricyclene(5.1%), trimethyl hydrazine(4.6%)이었다. 털진달래 정유의 향취는 coniferous, balsamic, woody하였으며, HaCaT 각질형성세포에 대한 $IC_{50}$ 값은 0.030 ${\mu}g/mg$이었다.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2000년도 춘계학술발표대회
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• pp.579-582
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• 2000

Enantiomerically pure hydroxycarboxylic acids have great potential as chiral building blocks in fine chemicals due to their easily modificable two functional groups. Microbial polyhydroxyalkanoates (PHAs) can have more than one hundred of hydroxycarboxylic acids as monomeric constituents by growing cells under various conditions. All of the monomeric constituents are enantiomerically pure in (R)-conformation if there is a chiral center. Therefore, efficient production of enantiomerically pure hydroxycarboxylic acids by degrading PHAs is possible. In this presentation, we report on the development of a novel method for the preparation of (R)-hydroxybutyric acid by in vivo depolymerization of Polyhydroxybutyrae.