The neutron capture spectrum for the light nuclide was very useful to study the nuclear structure. In the present study, the capture gamma-ray from the 27-keV resonance of 19F(n,g)20F reaction were measured with an anti-Compton NaI(Tl) spectrometer and the 3-MV Pelletron accelerator of the Research Laboratory for Nuclear Reactors at the Tokyo institute of technology. A neutron Time-of-Flight method was adopted with a 1.5 ns pulsed neutron source by the 7Li(p,n)7Be reaction. In the present experiment, a Teflon((CF2)n) sample was used The sample was disk with a diameter of 90mm. The thickness of sample was determined so that reasonable counting rates could be obtained and the correction was not so large for the self-shielding and multiple scattering of neutrons in the sample, and was 5mm. The primary gamma-ray transitions were compared with previous measurement of Kenny.

The objectives of this study were to examine the genetic variation of 20-year-old tree height and to estimate heritabilities and genetic gains of Korean white pine. Analysis of variance showed that families and family x block interaction had the significant (p=0.01) effects on tree height. However, family variation appears to be much greater than the variation due to family x block interaction. Individual tree heritability was higher (hI2=0.73) than family heritability, (hF2=0.83) therefore, combined selection showed the largest genetic gain (17.76%) in a given equal intensity of selection.

스테로이드 합성효소 중 는 progesterone을 을 거쳐 androstenedione으로 변환을 담당하는 효소이다. 양서류 난소에서 스테로이드 합성의 분자적 조절과정의 연구에 사용할 목적으로 북방산 개구리(Rana dybowskii) 난소에서 cDNA를 클로닝 하였다. 북방산 개구리 난포세포의 cDNA library 검색을 통해 분리된 약 2.5kb의 cDNA는 529개의 아미노산을 가진 단일 번역틀을 가지고 있었다. 개구리 의 아미노산 서열은 Xe

본 연구에서는 경안천 유역을 대상으로 과거의 경년 항공사진과 지형도를 이용하여 하천형태의 변화를 분석하고, 하천주위의 토지이용변화를 비교해 보고자 하였다. 이를 위해 경안천 유역의 지방 1, 2급 하천에 해당하는 1966년, 1981년, 2000년 항공사진에 내, 외부표정을 실시하여 정사영상을 생성하였으며 또한 1914 - 1915년 지형도를 이용하여 1966년, 1981년, 2000년의 하천과 비교하였다. 이 영상을 이용하여 경년 하천형태와 하천부지의

수자원분야에서 관측최대강수량은 주로 지점최대 강수량에 의해 평가되어 왔으나, 엄밀한 의미에서 강수량이라 함은 면적평균강수량으로 고려되어야 한다. 면적평균강수량은 관측호우의 DAD(rainfall Depth-Area-Duration) 분석을 통하여 계산된 추정치이고, 이로부터 대상면적-지속기간별 면적평균강수량 또는 최대관측강수량을 산정할 수 있다. 본 연구에서는 우리나라 전역을 수문학적으로 동질하다고 가정하여 호우중심의 DAD 분석을 수행하였으며, 이로부

A total of 20 soybean recommended varieties which were developed until late 1980's in Korea was evaluated at Suwon. Comprehensive evaluation and correlation analysis were conducted on the agronomic characters. Great variations were found in these genotypes for branch number, pod number, and grain yield per plant. The variation in number of pods/plant ranged from 53 to 164, and in grain yield from 25.9 to 68.8 g. The coefficient of variation for most of the characters had a wide range. In correlation coefficient, grain yield per plant showed a positive phenotypic association with weight of pods, pod number of branches, and weight of stem. Multiple regression analysis was done to formulate selection criteria. It indicated that stout and medium-stature genotypes with more branches, resulting in varieties with more pods per plant but with medium-size seeds are available to obtain high-yielding varieties.