• Journal of Plant Biology
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• 제39권3호
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• pp.203-207
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• 1996

On the basis of karyotypic analysis performed by conventional staining and Giemas C-banding technique, cytological relationship was inferred for 21 lines of Paeonia lactiflora Pal. cultivated in Korea. It was very difficult to infer their organized karyotypic classification system using the composition of somatic chromosomes involving sat-chromosomes, relative length of chromosomes, arm ratio and karyotypic formulae by conventional staining. From the distribution and number of Giemsa C-bands on the chromosomes b and c, 21 lines can be subclassified into 5 groups. It seems that the karyotypic polymorphism is observed in 21 lines of cultivated P. lactiflora because peony mainly propagates by outbreeding.

• 분석과학
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• 제8권4호
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• pp.477-480
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• 1995

Isotopic-spectral method [I] was applicated for determination of carbon in silicate materials (pure silica, guartz glasses, geological probs etc.). Isotopic heterogeneous balancing of carbon in gaseous phase and solid samples was carried out at the temperature of $1500-1900^{\circ}K$. Spectroscopic measuring of isotope concentration in a balanced gas was made using the electron-vibrational band heads of CO molecules excited in HF discharge. Limits of detection of carbon concentrations appear to be $n^*10^{-6}$.

• Journal of electromagnetic engineering and science
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• 제7권2호
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• pp.53-58
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• 2007

A general method to formulate the tissue-equivalent liquids for SAR measurement is proposed to make sucrose-free brain tissue applicable at 835 MHz as an example We suggest the tissue composition can be determined by measuring the dielectric constants and conductivities with the DI water and salt addition variation to the pre-manufactured auxiliary liquid of DGBE and TritonX-100 The manufactured liquid satisfies the specified electrical parameters of international standard at 835 MHz.

• 생명과학회지
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• 제8권3호
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• pp.318-325
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• 1998

To investigate changes in protein and total lipid contents, seed storage protein pattern, and fatty acid composition of germination perilla(Perilla frutescens) seeds. Also, the corresponding value components in cotyledons, hypocotyles and roots were measured according to germination stage. The results were summarized as follows ; During germination, pertein and total lipid contents of Yepsilldalggae and Kwangyang cultivar were decreased continuously. In particular, protein contents rapidly decreased to the 3 days after germination(DAG), and then total lipid contents rapidly decreased between 3 DAG and 10 DAG. In changes of protein and total lipid contents of cotyledons, protein contents of Yeupsildalggae was increased during the germination, but Kwangyang cultivar was decreased during the same periods. The total lipids contents of Yeupsildalggae and Kwangyang cultivar were decreased during the germination. According to SDS-PAGE analysis, there was no detectible polypeptide bands on the gel before seed germination suggesting that this may be due to the rapid degradation of the storage proteins in the mature seed by hydrolyttic enzymes during the stage. During germinatation , the polypeptide band with 27$\sim$28KD of Yeupsildalggae and Kwangyang cultivar were accumulated gradually. In changes of fatty acid composition of total lipid of Yeupsildalggae and Kwangyang cultivar , saturated fatty acids such as palmitic acid and stearic acid increased during the germination. On the other hand, unsaturated fatty acid such as linoleic acid and linolenic acid decreased during the same periods. However, oleic acid increased to the 5 DAG, and then was repidly decreased.

• Journal of Microbiology and Biotechnology
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• 제10권2호
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• pp.143-146
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• 2000

This study was conducted to compare the cellular fatty acid composition and genotypic analysis of Bifidobacterium longum MK-G7 originated from Koreans with other commercial type strains of bifidobacteria. The cellular fatty acid of Bif. longum MK-G7 was shown to be composed of $C_{160FAME},C_{181\;c18DMA},C_{18.1\;CIS9\; FAME},C_{14.0FAME},C_{19\;0cye9,10 DMA},Feature7(C_{17.2 FAME), and Feature 10(C_{181\; Cll/t9/t6 FAME}$. Bif. longum MK-G7 showed 99.9% homology and the highest relatedness with Bif. longum ATCC 15707 type strain. Both Bif. longum MK-G7 and Bif. longum ATCC 15707 showed 153 bp products on RAPD (randomly amplified polymorphic DNA) analysis, however, they showed quite different band patterns on PFGE (pulsed-field gel electrophoresis) analysis. Consequently, our present study showed that Bif. longum MK-G7 was different from any commercial type strains of Bif. longum tested.

• 한국결정성장학회지
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• 제11권3호
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• pp.96-101
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• 2001

본 연구에서는 열벽 적층 성장법으로 GaAs(100) 기판 위에 $Zn_{1-x}Mn_{x}Te$ 에피층을 성장하여 그 특성을 조사하였다. $Zn_{1-x}Mn_{x}Te$ 에피층의 Mn 조성비는 x = 0.97까지 얻을 수 있었으며 성장된 시료의 결정구조는 징크브랜드이었다. 성장된 면은 GaAs (100) 기판과 동일한 방향으로 성장되었다. 성장시 기판 온도가 $350^{\circ}C$에서 $400^{\circ}C$로 증가함에 따라 Mn 조성비 x는 0.02에서 0.23으로 증가하였다. $Zn_{1-x}Mn_{x}Te$ 에피층의 격자상수는 Mn 조성비 x가 증가할수록 선형으로 증가하였고 띠 간격 에너지는 x에 대하여 비선형으로 증가하였다.

• 한국표면공학회지
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• 제44권5호
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• pp.185-189
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• 2011

$Cu_2ZnSnSe_4$ thin films for solar absorber application were prepared by pulsed laser deposition of a synthesized $Cu_2ZnSnSe_4$ compound target. The film's composition revealed that the deposited films possess an identical composition with the target material. Further film compositional control toward a stoichiometric composition was performed by optimizing substrate temperature, deposition time and target rotational speed. At the optimum condition, X-ray diffraction patterns of films showed that the films demonstrated polycrystalline stannite single phase with a high degree of (112) preferred orientation. The absorption coefficient of $Cu_2ZnSnSe_4$ thin films were above 104 cm.1 with a band gap of 1.45 eV. At an optimum condition, films were identified as a p type semiconductor characteristic with a resistivity as low as $10^{-1}{\Omega}cm$ and a carrier concentration in the order of $10^{17}cm^{-3}$.

• 대한화학회지
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• 제21권3호
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• pp.210-214
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• 1977

한국산 밀 품종들 중에서 장광의 것을 선정하여 단백질을 추출한 다음 이 단백질의 아미노산 조성과 gliadin 단백질의 정제로 주 gliadin 단백질을 분리하여 본 결과 1. Gliadin과 glutenin 단백질은 다같이 disc 전기이동상에 5개의 band를 나타내었다. 2. Gliadin과 glutenin 단백질은 다같이 glutamic acid의 함량이 가장 많았다. 3. Gliadin과 glutenin 단백질간에 아미노산 조성의 차이는 gliadin이 glutenin보다 alanine의 함량은 적었으나 proline의 함량은 많았다. 4. 주 gliadin 단백질은 gliadin 단백질을 Sephadex G-150과 A-25 coumn으로 정제하여 얻었다.

• 한국세라믹학회지
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• 제50권4호
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• pp.288-293
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• 2013

Zn-In-Sn-O films were prepared at room temperature by combinatorial RF-magnetron co-sputtering system. The cationic contents of the films were varied using a compositionally combinatorial technique. The effects of the oxygen partial pressure and film compositionon the structural and electrical properties were investigated. The Zn-In-Sn-O films deposited at Ar gas atmosphere showed an amorphous phaseirrespective of the film composition. However, the amorphous Zn-In-Sn-O films with a Zn content below 30.0 at% were converted into a bixbyite type-ITO polycrystalline phase with an increase in the oxygen partial pressure. The resistivity, carrier concentration, and Hall mobility were strongly affected by the oxygen partial pressure and chemical composition of the film. At sufficiently high carrier densities above $5{\times}10^{18}cm^{-3}$, the conduction behavior of amorphous Zn-In-Sn-O film changes from thermally activated to degenerate band conduction accompanied with high mobility.

• 한국정보통신학회논문지
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• 제5권5호
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• pp.994-1000
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• 2001

정보통신기술의 발달과 전자기기의 사용량 증가에 따른 전자파장애의 발생이 점차 사회 문제화되면서 그 대책이 요구됨에 따라 전자파 흡수체에 대한 관심도 증가되고 있는데 본 연구에서는 전자파 흡수체로 알려진 NiCuZn 페라이트의 조성비 및 소결온도 변화에 따른 복소유전율과 복소투자율의 주파수 의존 특성을 알아보고 전자파 흡수성능에 대한 영향을 조사하였다. NiCuZn 페라이트의 조성 중 $Fe_2O_3$및 ZnO를 각각 49.0, 34.0mol%로 고정하고 NiO 및 CuO의 구성비를 변화시켜 측정한 결과 NiO의 구성비가 8.5~9.5 mol%의 범위에서, 소결온도는 $1080^{\circ}C$에서 초투자율 및 유전율이 크고 $loss tangent(=\mur"/\mur')$가 약 2 MHz~9.5 GHz 주파수 대역에서 1 이상을 보이며 전파흡수 성능이 가장 우수하게 나타났다.나타났다.