• Bulletin of the Korean Chemical Society
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• 제21권10호
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• pp.1044-1046
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• 2000

Catalytic copolymerization of diethyl dipropargylmalonate (DEDPM) and phenylacetylene (PA) by Mo(CO)6 and (toluene) Mo(CO)3/chloranil has resulted in the expected copolymer consiting of a polyene backbone with five-and/or six-membered rings and th e PPA structure. Both complexes exhibited not only varying degree of catalytic activity depending upon the relative mole ratio of two monomers but also characterize the types of coploymers. The former yields the polyene backbone containing only five-membered rings as well as PA while the latter produces the polymers consisting of both five-and six-membered ring structure. Comparative studies show that Mo(CO)6 exhibits reactivity toward DEDPM alone, thus catalyzing initially metathesis cyclopoly-merization of DEDPM followed by copolymerization with PA while the (toluene)Mo(CO)3/chloranil system shows affinity for both PA and DEDPM.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.392.2-392.2
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• 2016

본 연구에서는 인버티드 유기 태양전지에 적용하기 위한 버퍼 하이브리드 투명 캐소드를 RF/DC magnetron 스퍼터를 이용하여 제작하고 그에 대한 특성평가와 적용 가능성에 대해 연구하였다. 버퍼-캐소드 하이브리드 투명 전극은 ZnO, Ag, ITO를 이용하였고, Ag와 ITO의 두께는 고정한 상태에서 버퍼 역할을 하는 ZnO의 두께를 변수(25 nm ~ 45 nm)로 하여 ZnO두께에 따른 광학적, 전기적, 구조적, 표면 특성을 분석하였다. ZnO/Ag/ITO 하이브리드 투명전극의 최적의 조건에서 92%의 높은 투과도와 7.6 Ohm/square의 낮은 면저항을 갖는 버퍼-캐소드 하이브리드 투명전극을 구현하였다. 제작한 ZnO/Ag/ITO 버퍼 하이브리드 투명전극을 인버티드 유기 태양전지에 적용한 결과 버퍼 ZnO층을 스핀 코팅으로 제작한 인버티트 유기 태양전지에 비해 현저하게 낮은 효율을 나타내는 것을 확인 하였다. 이러한 이유를 규명하기 위해 스핀 코팅한 ZnO박막과 스퍼터 한 ZnO박막의 구조적, 표면적 특성을 비교 분석 하였고, UPS 분석 결과 스핀 코팅한 ZnO 박막의 일함수(3.3 eV)에 비해 스퍼터 한 ZnO박막의 일함수(4.4 eV)가 더 큰 것을 확인 할 수 있었다. 이를 통해 인버티드 유기 태양전지 소자의 효율을 높이기 위해서는 광학적 전기적 특성뿐 아니라 적절한 일함수와 공정방법의 중요성을 확인 하였다.

• International Journal of Industrial Entomology and Biomaterials
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• 제7권1호
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• pp.21-27
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• 2003

Manifestation of heterotic genetic interaction was studied in different hybrids made between multivoltine recurrent backcross (RBL)/congenic lines (Con. L) during unfavourable season when temperature and relative humidity are > $30^{\circ}C$ and 86%, respectively. A few number of silkworm race or strain or breed like Nistari (N ＋ p or Np) can sustain the temperature above 3$0^{\circ}C$ and RH above 86%. The present heterosis study screened a hybrid i.e., CB$_{5}$Lm5RBL1M$_{6}$DPC-LmE$^1$RBL and its reciprocal provided heterobeltiotic effect on survival by number and pupation rate at a magnitude of 20% (p < 0.01) and yield by weight of 10% (p < 0.01). Beside all the hybrids expressed heterosis over check - Nistari (N ＋ p) with better quality silk. Therefore, aforesaid hybrid may be useful for utilization at commercial level during adverse seasons of West Bengal.gal.

• 한국동물학회지
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• 제38권2호
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• pp.196-203
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• 1995

The c-myc proto-oncogene, one of the immediately earlY genes, is expressed in various mammalian cell types and heavily involved in the regulation of cell proliferation and differentiation. To determine endogeneous expression pattern of c-myc gene in preimpBantation mouse embwos, we employed a reverse transcription coupled to polvrnerase chain reaction (RT-PCR). Transcript of c-myc was detected at fertilized embryos as a maternal transcript. At the early two-cell stave, transcript of c-myc gene was hardly detected, bu, appeared at late two-cell embryos as a zygotic transcript. The level of c-myc expresion was increased at later stases and peaked at blastocvst stage. To examine the functional role of promoter region for c-myc gene transcription, we fused the 5'upstream region (1.8 kb) including econ 1 of c-myc genomic DNA with E. coli lacE gene fnamed as pcMYC-laczl. pcMYC-lacZ was microiniected into the pronscleus of mouse one-cell embryovs, and p·salactosidase activity was determined tv histochemical staining with X-gal at different stases. f-galactosidase activity was detected only at blastocyst, but not at the earlier stage embryos. This result indicates that c-myc gene is transcriptionallv active during mouse preimplantation development.

• Reproductive and Developmental Biology
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• 제34권1호
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• pp.33-40
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• 2010

Equine chorionic gonadotropin (eCG) is a heavily glycosylated glycoprotein composed of non-covalently linked $\alpha$- and $\beta$-subunits. To study the function and signal transduction of tethered recombinant-eCG (rec-eCG), a single chain eCG molecule was constructed, and the rec-eCG protein was prepared. In this study, we constructed 5 mutants (${\Delta}1$, ${\Delta}2$, ${\Delta}3$, ${\Delta}4$, and ${\Delta}5$) of rec-eCG using data about known glycoprotein hormones to analyze the role of specific follicle stimulating homone (FSH)-like activity. Three amino acids of certain specific sites were replaced with alanine. The expression vectors were transfected into CHO cells and subjected to G418 selection for 2~3 weeks. The media were collected and the quantity of secreted tethered rec-eCGs was quantified by ELISA. The LH- and FSH-like activities were assayed in terms of cAMP production by rat LH/CG and rat FSH receptors. Then, the metabolic clearance rate analyzed by the injection of rec-eCG (5 IU) into the tail vein was analyzed. The mutant eCGs (${\Delta}l$, ${\Delta}4$, and ${\Delta}5$) were transcripted, but not translated into proteins. Rec-eCG A2 was secreted in much lower amounts than the wild type. Only the rec-eCG ${\Delta}3$ ($\beta$-subunit: $Gln^{94}-Ile^{95}-Lys^{96}{\rightarrow}Ala^{94}-Ala^{95}-Ala^{96}$) was efficiently secreted. Although activity is low, its LH-like activity was similar to that of tethered $eCG{\beta\alpha}$. However, the FSH-like activity of rec-$eCG{\beta\alpha\Delta}3$ was completely flat. The result of the analysis of the metabolic clearance rate shoed the persistence of the mutant in the blood until 4 hours after the injection. After then, it almost disappeared at 8 hours. Taken together, these data suggest that 94~96 amino acid sequences in eCG $\beta$-subunit appear to be of utmost importance for signal transduction of the FSH receptor.

• 자원환경지질
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• 제54권1호
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• pp.91-103
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• 2021

경상북도 포항시 냉수리 지역에 위치하는 양산단층의 수평 및 수직적 규모를 파악하기 위해서 단층을 동-서로 가로지르는 측선을 따라 중력장을 측정하였다. 그 결과, 단층 경계부에서 1.5 mGal의 뚜렷한 중력의 변화를 확인하였다. 이는 양산단층 서쪽과 동쪽의 지각 밀도가 서로 다르다는 것을 나타내며, 기존의 지질 및 지구물리 조사 결과와 비교해 보았을 때, 냉수리를 통과하는 양산단층은 서쪽의 불국사 화강암층과 동쪽의 경상계 퇴적암이 혼합된 파쇄대라는 것을 의미한다. 오일러 디콘볼루션(Euler deconvolution) 및 곡률 분석(Curvature analysis) 방식을 이용하여 파쇄대의 3차원적 규모를 확인한 결과, 깊이는 약 2,000 m이며, 남남서-북북동 방향으로 최소 약 3,000 m 정도 이어지는 것으로 파악되었다. IGMAS+ 소프트웨어를 이용한 지각구조 모델링 결과는 파쇄대 서쪽과 동쪽 지각의 밀도 차이가 약 0.1 g/㎤이라는 것을 보여주었다. 이상의 연구 결과는 중력장 데이터의 해석과 모델링이 지표면에 나타난 활성단층의 규모를 심부까지 파악 할 수 있는 매우 효과적인 방법이라는 것을 보여준다. 또한 지금까지 지표면을 중심으로 2차원적으로 수행했던 활성단층 지도 제작 사업의 영역을 3차원으로 확대할 수 있는 이상적인 수단이 된다.

• 미생물학회지
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• 제42권4호
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• pp.252-256
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• 2006

본 연구에서는 지역사회 일반인에게 분리된 대장균과 종합병원을 내원한 설사환자에서 분리한 대장균에 대하여 항생제 내성현황을 모니터링 하였다. 2006년 2월$\sim$7월까지 인천의 지역사회 일반인 692명의 대변으로부터 순수하게 분리된 대장균 491 균주에 대해 항생제 내성균을 조사한 결과, tetracycline 내성이 46.6%, ampicillin 내성이 41.1% ticarcillin 내성이 37.9%였다. 또한 3차 의료기관의 설사환자에서 분리된 대장균 120 균주에 대하여 ampicillin 내성이 66.9%, ticareillin 내성이 63.8%, tetracycline 내성이 47.2%였다. $\beta$-lactam 분해효소(extended spectrum $\beta$-lactamase)를 생성하는 대장균은 지역사회 일반인의 경우 0.6%, 설사질환자의 경우4..1%로 각각 분리되었다.

• Bulletin of the Korean Chemical Society
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• 제30권10호
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• pp.2329-2337
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• 2009

Three heteroleptic ruthenium sensitizers, Ru(L)($L^1)(NCS)_2$ [L = 4,4'-dicarboxylic acid-2,2'-bipyridine, Ru-T1: $L^1$ = (E)-2-(4'-methyl-2,2'-bipyridin-4-yl)-3-(thiophen-2-yl)acrylonitrile, Ru-T2: $L^2$ = (E)-3-(5'-hexyl-2,2'-bithiophen-5- yl)-2-(4'-methyl-2,2'-bipyridin-4-yl)acrylonitrile, and Ru-T3: $L^3$ = (E)-3-(5"-hexyl-2,2':5',2"-terthiophen-5-yl)-2- (4'-methyl-2,2'-bipyridin-4-yl)acrylonitrile)], were synthesized and used as photosensitizers in nanocrystalline dyesensitized solar cells (DSSCs). The introduction of the 3-(5-hexyloligothiophen-5-yl)acrylonitrile group increased the conjugation length of the bipyridine donor ligand and thus improved their molar absorption coefficient and light harvesting efficiency. DSSCs with the configuration of Sn$O_2$: F/Ti$O_2$/ruthenium dye/liquid electrolyte/Pt devices were fabricated using these Ru-$T1{\sim}T3$ as a photosensitizers. Among the devices, the DSSCs composed of Ru-T2 exhibited highest power conversion efficiency (PCE) of 2.84% under AM 1.5 G illumination (100 mW/$cm^2$).

• 천문학회보
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• 제42권2호
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• pp.86.2-86.2
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• 2017

Blue stragglers (BSs) are the objects that are brighter and bluer than the stars at main-sequence turn-off point. In this study, we present the Ca-by and VI photometry for Galactic dwarf spheroidal galaxies using Subaru/Suprime-Cam and investigate the spatial distribution characteristics of BS stars using the hk index as a photometric metallicity indicator. We compare the cumulative radial distribution of the BS stars with those of two groups of red-giant-branch (RGB) stars divided by the hk-index strength, and find that the spatial distribution of all BS stars is closer to that of hk-weak (i.e. metal-poor) RGB stars. We also find that the hk-strong BS stars are more centrally concentrated than the hk-weak ones. We will discuss the use of hk-index as a metallicity indicator for the hot BS stars and suggest possible explanations for the results in terms of the origin of BS stars in the dwarf gal.

• Journal of Microbiology and Biotechnology
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• 제2권3호
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• pp.209-214
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• 1992

Serratia marcescens co-cultured with various phytopathogenic fungi, including Rhizopus stolonifer, Helminthosporium allii, Pyricularia oryzae, Fusarium oxysporium and Collectothricom cassiicola, in an LB- agar medium containing 1.5% swollen chitin, significantly inhibitied fungal growth. Fungal hyphae grew rapidly outward from the culture dish center, but the hyphal extensions of the pathogenic fungi were significantly inhibited in a perimetric contact area with S. marcescens. This was especially evident in pathogenic fungi which have a high chitin content in their cell walls. The extracellular chitinase activities of S. marcescens were increased seven fold by the addition of 1.5% swollen chitin to the LB-broth, compared to chitinase activities in a culture medium without chitin. The type of induction was dependent on the various forms of chitin used. When the culture supernatant of S. marcescens or the chitinases of Streptomyces griceus purchased from Sigma Chemical Co., were incubated with the mycelium of F. oxysporium, the mycelium gradually burst as cultivation time progressed and completely lysed after incubation for 2 days. On the other hand, E. coli extract did not hydrolyze the F. oxysporium mycelium at all. These data showed that the chitinolytic activities of S. marcescens play important roles in the biochemical control of phytopathogenic fungi.