발포폴리스티렌비드를 사용한 경량콘크리트의 역학적 특성에 관한 실험적 연구

주재금,이종찬,오세출,유택동,정광량,서치호 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

The purpose of this study is to obtain basic data on the properties of the lightweight concrete within expanded polystyrene beads for various applications in the field. Inquiring into the change of the properties as altering cement matrix mixture and the capacity mixture ratio of expanded polystyrene beads, the mixture plane of this study is set up as W/C is fixed 50%, expanded polystyrene beads is increased 10% from 0% to 80% per 1m³ and the ratio of cement:sand in the cement matrix is 1:0, 1:0.5, 1:1. The results of this study are as follow. The slump as changing the mixture ratio of expanded polystyrene beads decrease smoothly until mixture ratio 50% but decrease rapidly being in excess of 50%. The density decrease regularly as the mixture ratio of expanded polystyrene beads increase but the ratio of strength decrease. The difference of cement matrix. The strength of cement matrix having more sand mixture ratio relatively decrease rapidly as increasing the mixture ratio of expanded polystyrene beads. It is judged decreased strength phenomenon as the quantity of coherent material created in the mixture decrease rapidly.

흰민들레 (Taraxacum coreanum) 추출물이 급성 수은 중독된 생쥐의 간에 미치는 효과

정민주,윤중식,허진,노영복,최영복,김종세,이현화 韓國電子顯微鏡學會 2008 Applied microscopy Vol.38 No.1

본 연구는 급성 수은 독성에 대한 민들레의 효과를 알아보기 위하여 시도되었다. 30 g 내외의 생쥐를 대상으로 대조군, 수은(5mg/kg) 투여군, 수은 투여 후 민들레(3 g/kg)를 구강투여 한 후 다시 24, 48, 72, 96시간, 1주일군으로 세분하여 간장 손상 억제 효과를 알아보기 위하여 생화학적 및 조직학적 실험을 실시하였다. 혈액중 aspartate amiotransferase (AST)와 alanine aminotransferase (ALT)의 수치는 민들레 투여군이 수은 투여군보다 감소되었다. 또한 간조직의 SOD와 catalase 활성도 역시 민들레 투여군이 수은 투여군에 비하여 감소하였으나 통계학적 유의성은 없었다. 간 조직의 광학현미경적 관찰에서 심한 조직괴사가 관찰되지만 민들레 투여군에서는 문맥주위의 약간의 괴사와 심한 호중구 침윤현상이 관찰되었다. 전자현미경적 관찰 결과, 간장에서 수은 투여군은 간세포의 핵이 함입되어 불규칙했으며 미토콘드리아와 조면소포체의 수조가 팽대되고, 리보솜의 탈락이 관찰되었다. 민들레 투여군은 핵이 정상적인 상태로 관찰되었고, 전자밀도가 높은 미토콘드리아가 분포되어 있었으며, 리보솜이 부착된 상태로 층판구조를 형성하는 조면소포체가 관찰되었다. 이상의 연구 결과로 보아 민들레가 수은으로 유발된 간손상을 보호하는 효과가 있는 것으로 사료되며 민들레에 대한 다양한 연구가 필요할 것으로 사료된다. Dandelion has been frequently used as a remedy for women’s disease, inflammatory diseases and disorders of the liver and gallbladder. Dandelion extracts water extract, an herbal medication, may have an effect on the activity of hepatic antioxidant enzymes in diabetic rat. This study aims demonstrate the effect of dandelion extracts, one of the natural chelator, on the biochemical and enzyme activity changes in the mouse liver caused by HgCl₂. Mice approximately 30 gm in weight were grouped into the control, mercury chloride-treated, and the dandelion extractstreated after mercury chloride groups. HgCl₂ (5 mg/kg) and dandelion extracts (3 g/kg) were delivered orally. Serum AST and ALT were measured, enzyme activity of liver were examined by spectrophotometer and ultrastructural alteration of liver were examined by light and electron microscopy. Dandelion extracts were decreased the increase of serum AST and ALT level induced by mercury. The catalase activity was decreased in the dandelion extracts group. The activity of SOD was dereased, but did not show significant differences. Mercury chloride-treated hepatic cell were irregular nucleus, enlarged and reduced number of mitochodria, enlarged rough endoplasmic reticulum, loss of ribosomes. Cells treated with dandelion extracts were similar to those of the control group. In conclusion, dandelion extracts may protect the mercury-induced toxicity on Liver.

β-naphthol 유도체 합성 및 항종양활성 검토

이주영,류수진,박예진,황순호,이마세,김인종,김동현,김신규 慶熙大學校 1996 論文集 Vol.25 No.-

Sythesis of β-naphthol derivatives and their anti-tumor activity were investigated. Binaphthol 1 obtained from β-naphthol by oxidative C-C bond formation(phenoloxydation) was converted into its derivatives. Treatment of 1 with POCl_3 followed by aziridine introduction gave phosphoryl aziridine 3. Also, diaziridine 5 was obtained from 1 by chlorination and successive aziridine introdution. Typical chemical transformation of 1 to obtain ester-type afforded compound 7 and 8. Compound 5 was the most effective derivative of the tested compounds on their anti-tumor activity.

맥주맥 F_1세대의 조합능력 검정

정원복,오주성,황필성,김수동,서세정,현종내,김대호 東亞大學校 2002 東亞論叢 Vol.39 No.-

맥주맥의 이면교잡에 의한 F_1세대에 대한 조합능력을 검정한 결과를 요약하면 다음과 같다. 8개 형질에 대한 GCA, SCA, RCA효과를 검정한 바 조합능력은 전 형질에서 GCA, SCA, RCA가 모두 유의하였는데 간장, 수장, 망장, 간직경, 곡핍폭, 1수립수 1000립중은 GCA가 SCA보다 크고, 품종간 GCA효과는 진양보리가 간장에서 부(-)이고, 삼도보리가 수장·망장·간직경·1000립중에서, 사천6호가 망장과 간직경에서, 진광보리가 곡립장에서, 두산29호가 곡립폭·1수립수·1000립중에서 각각 정(+)으로 높았다. SCA효과에서 수장은 두산29호×두산8호 조합이, 망장은 진양보리×두산29호 조합이, 간직경은 사천6호×진광보리 조합이, 곡립장은 진양보리×두산8호 조합이, 곡립폭은 진광보리×두산8호 조합이, 1수립수는 진양보리×삼도보리 조합이, 1000립중은 사천6호×두산8호 조합 및 두산29호×두산8호 조합이 각각 정으로 높았고, 간장은 삼도보리×진광보리 조합이 부로서 높았다. RCA효과에서 수장은 두산8호×남향보리 조합이, 망장은 진양보리×삼도보리 조합이, 간직겨은 사천6호×진양보리 조합이, 곡립장은 사천6호×진광보리 조합이, 곡립폭은 진양보리×삼도보리 조합이, 1수립수는 사천6호×두산29호 조합이, 1000립중은 진양보리×두산29호 조합이 각각 정으로 높았고, 간장은 사천6호×두산29호 조합이 부로서 높았다. Seven barley varieties in F_1 generation of the possible crosses among them were used to estimate the combining ability for eight characters, i.e., culm length, spike length, awn length, culm diameter, grain length, grain width, number of grains per spike and 1000 grains weight. Data for F_1 hybrid and parents were subjected to the analysis method proposed by Griffing. The results obtained were summarized as follows. mean squares of general combining ability(GCA), specific combining ability(SCA) and reciprocal combining ability(RCA) were significant for all characters observed. Mean squares of GCA were higher than those of SCA and RCA in culm length, spike length, awn length, culm diameter, grain width, number of grains per spike and 1000 grains weight. Variety Dusan#29 showed the highest GCA effect for number of grains per spike and positively high effects of GCA were observed from variety Samdo bori in spike length, awn length, culm diameter, 1000 grains weight, and from variety Jinkwang bori I grain length, from Dusan#29 in grain width, umber of grains per spike, 1000 grains weight. Also Jinyang bori showed negatively high GCA effect in culm length. In SCA effects, hybrids in Jinyang bori × Samdo bori were exhibited positively high for number of grains per spike and high SCA effects for 1000 grins weight were found positively in Sacheun#6×Dusan#8 and Dusan#29×Dusan#. In RCA effects, hybrids in Sacheun#6×Dusan#29 were exhibited positively high for number of grains per spike and high RCA effects for 1000 grains weight were found positively in Jinyang bori×Dusan#29.

규산질 비료의 참외 흰가루병 발생 억제 효과

류나현,최미영,류연주,조현종,이용세,이영득,정종배 한국환경농학회 2003 한국환경농학회지 Vol.22 No.4

토양에 시용한 규산의 참외 흰가루병에 대한 직접적인 억제 효과와 살균제의 방제 효과를 증진시킬 수 있는 보조효과를 조사하였다. 규산질 비료의 처리는 철가루병 균에 의해 감염된 참외 잎에서 균사의 생장과 분생포자의 형성을 억제함으로써 흰가루병 발생을 일부 억제할 수 있는 것으로 조사되었다. 물론 규산질 비료 자체만의 흰가루병 발생 억제 효과는 매우 미약한 수준이었으나 살균제의 흰가루병 방제 효과를 크게 증진시켜줄 수 있는 것으로 나타났다. 따라서 현재 농가 현장에서 밝혀지고 있는 규산질 비료의 참외 병해 발생 억제 효과는 주로 이러한 살균제의 효과를 증진시킬 수 있는 규산의 보조적인 작용에 기인하는 것으로 판단된다. 따라서 토양에 대한 적절한 수준의 규산질 비료의 시용은 살균제의 방제 효과 증진을 통하여 과다한 약제의 사용과 그에 따른 부작용을 경감시킬 수 있을 것으로 보인다. 규산질 비료의 흰가루병 발생 억제 효과를 증진시키기 위해서는 앞으로 병의 발생을 최대로 억제할 수 있는 참외 잎 중의 적정 규소 함량에 대한 검토 등의 추가적인 연구가 필요할 것이다. Silicon is known to accumulate in plants and results in greater resistance to diseases and insect pests. In this study, we investigated the effect of silicate fertUizer applied in soil on the development of powdery mildew of oriental melon Oriental melon seedlings of four-leaf stage were transplanted and grown in a plastic film house. silicate fertilizer was applied to maintain soil available SiO₂ level of 200 ㎎/㎏ one week before transplanting. Fungicide trinumizol was sprayed three times; one, two, and three weeks after transplanting. Sphaerotheca fuliginea was inoculated 2 weeks after transplanting. The number of infected leaf and the number of fungal colony in leaves were measured one, two, and three weeks after the inoculation. Three weeks after the fungal inoculation, in the treatment of fungicide triflwnhl, infected leaf numbem and number of colony per leaf were reduced by 10 and 58% respectively. In the silicate fertilizer treatment, infected leaf numbers and numbers of colony per infected leaf were suppressed only by 6 and 16%, respectively, and the efficacy was lower than that of the fungicide triflumizol. The combined treatment of silicate fertilizer and the fungicide suppressed powdery mildew more effectively, and infected leaf numbem and numbem of colony per leaf were reduced by 31 and 80%, respectively. These results indicate that although silicate fertilizer itself is not much effective in the suppression of powdery mildew, it can significantly enhance the efficacy of the fungicide.

고혈압백서 대동맥에서 Ca에 의한 수축에 미치는 Na/Ca교환기전의 영향

전병화,김국성,박경숙,김주석,김세훈,장석종 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1

We investigated the contraction by sodium-calcium(Na-Ca) exchanges in the aortic strips of spontaneously hypertensive rats(SHR) and Wistar-Kyoto (WKY) rats. Resting tension of aortic strips in SHR was decreased by the removal of extracellular Ca and those were recovered by the addition of Ca. However, resting tone of aortic strips in WKY was not changed by Ca removal or Ca addition. Ca-induced contraction after exposure to Ca-free solution was suppressed by verapamil 10^-6M to 90% or more. In the presence of verapamil 10^-5M, phentolamine 10^-6M, caffeine 5mM and atropine 10^-6M, the reduction of extracellular sodium concentration([Na]o) from normal(158 mM) to 0 mM(replaced by choline chloride) caused the contraction(Ca entry by Na-Ca exchange). The amplitude of contraction was more greater in SHR than in WKY rats. In the presence of verapamil 10^-5M, phentolamine 10^-6M, caffeine 5mM and atropine 10^-6M, aortic strips were not contracted by Naand Ca-free solution, but was contracted by the addition of Ca. In the presence of verapamil 10^-5M and phentolamine 10^-6M and ouabain 10^-5M, Ca did not induce contraction after exposure to Ca-free Tyrode ' s solution, but in the presence of verapamil 10^-5M and phentolamine 10^-6M and monensin 10^-5M a sodium ionophore, Ca induced a little contraction in the aortic strips of SHR. These observations suggest that Na-Ca exchange does not contribute the development of Ca-induced contraction after exposure to Ca-free Tyrode ' s Solution in the presence of normal extracellular Na concentration. However, Na/Ca exchange in vascular smooth muscle is increased in SHR and may be involved in the mechanism for hypertension in SHR.

Effect of Bamboo Biochar on Mitigation of Greenhouse Gases in Lettuce Cultivation

Se Won Kang,Dong Cheol Seo,Ju Wang Park,Ju Dong Yang,Young Jin Seo,Sang Guy Lee,Jong Soo Heo,Ju Sik Cho 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Adsorption capacities of nitrogen and phosphorus by biochars from water plants

Jong Hak Han(한종학),Dong-Cheol Seo(서동철),Se-Won Kang(강세원),Ik-Won Choi(최익원),Byung-Jin Lim(임병진),Jong-Hwan Park(박종환),Kap-Soon Kim(김갑순),Jun-Bae Lee(이준배),Jong-Soo Heo(허종수),Ju-Sik Cho(조주식) 한국토양비료학회 2011 한국토양비료학회 학술발표회 초록집 Vol.2011 No.10

The Silver Cycle and Fluxes in the Ocean

Ju, Se-Jong The Korean Society of Oceanography 1997 Journal of the Korean Society of Oceanography Vol.32 No.3

The biogeochemical cycle of silver has rarely been reviewed, even though the silver ion (Ag$^{\times}$) is extremly toxic to some organisms. Its concentration is still rising sharply because of increased anthropogenic activity, specifically the discharge from the film industry (mainly, silver thiosulfate: Ag (S$_2$O$_3$)${^3-}_2$). Recently, a number of researchers have quantified the major fluxes and reservoirs of silver in the open ocean, bays, and estuaries. A review of the available information for Ag cycling in the open ocean shows that the riverine input (from human activity and weathering processes: 7${\times}$10$^6$ kg/yr and 5${\times}$10$^6$ kg/yr, respectively) is the dominant source of Ag to estuarine and coastal regions. Most of the silver (90% of riverine input silver) is removed in coastal sediments by the physical-chemical character of silver due to its high partitioning with particulate matter. On the other hand, in the open ocean the atmospheric input (wet and dry deposition: 1.48${\times}$10$^6$ kg/yr and 1.94${\times}$ 10$^5$ kg/yr, respectively) becomes more important as a source of silver than riverine input. The residence time of silver calculated from available data is 1250 yrs in the deep ocean below 500 m, but only 3 yrs in the surface ocean.

Effect of Sesame Stalk Biochar on Growth and Nutrient Contributions of Green Manure Crops of Gramineae and Leguminous Species in Rice-Green Manure Crop Rotation

Ju Dong Yang,Dong Cheol Seo,Se Won Kang,Ju Wang Park,Young Jin Seo,Sang Gyu Lee,Jong Soo Heo,Ju Sik Cho 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6