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單位生殖에 의한 감자 半數體植物 誘起 Ⅲ. 色素遺傳子 發現樣相에 따른 半數體植物 選拔
Hyun Mook Cho(趙賢默),Hei Young Kim Lee(金惠英),Il Gin Mok(睦一振) 한국육종학회 1993 한국육종학회지 Vol.25 No.1
Interspecific and Interploidal crosses were made between tetraploids and diploids to induce potato haploids. Tetraploids female parents were grouped into three different types according to the pigments on the stem. Pigments on seeds, seedlings and mature plants were used as phenotyphic markers to select haploids. Haploids were derived only from non-embryo spot seeds from all of the three types of the female parents. The positive selection for non-pigmented plants at seed and seedling stage was highly accurate to select haploid in the progenies of the female parents with green stem (group G), except the cv. Russet Burbank. Most of seedlings with white hypocotyl in the progenies of female parents with basal purple(group BP) or whole purple stem(group P), were haploids. However, 45.5% and 69.5% of the seedlings with white-purple hypocotyl derived from these groups were haploids, respectively. Because of the matroclinous effect of their female parents on plant pigmentation, the negative selection for purple pigmented plants at seed, seedling, growth and subsequently, harvest stage, was effective. As a consequence, a two step selection method was applicable for group BP and P ; select the seedlings with only white hypocotyl at seedling stage as haploids, and discard all the plants with purple pigments on the hypocotyl, stem and tuber skin according to gradual plant growth. Up to now, from 1,253 of non-embryo spot seeds, 199 haploid plants were confirmed by the phenotypic markers and subsequently root-tip chromosome counting. The efficiency of haploid induction through interspecific and interploidal crosses was affected by different tetraploids female parents.
조현일 ( Hyun Il Cho ),조성윤 ( Song Yun Cho ),김영미 ( Young Mi Kim ),전동주 ( Dong Ju Jeon ),김은경 ( Eun Kyoung Kim ) 한국화상학회 2002 한국화상학회지 Vol.8 No.1
광변색 디아릴에텐 유도체의 형광특성에 관해서 조사하였다. 디아릴에텐 유도체는 1,2-비스(2-메틸벤조[b]티오펜-3-일)헥사플루오르시클로펜텐 (BTF6)을 출발 물질로 하여 6,6’의 위치에 극성 작용기를 도입함으로서 합성하였다. 이러한 유도체의 색은 자외선 단파장(325nm)을 조사하면 붉은색으로 변화되고 다시 가시광선을 조사함으로서 무색으로 소색되었다. 광변색성의 고리화 반응과 디아릴에텐 유도체의 형광특성은 방향족고리에 치환된 치환체에 의해서 영향을 받았다. 형광수율은 광변색 효율이 낮은 디아릴에텐 유도체에서 높게 나타났다. 이는 디아릴에텐의 형광은 여기된 parallel 이성체로부터 기인한다는 것을 의미한다. Fluorescence property of photochromic diarylethene derivatives was investigated. The diarylethene derivatives were synthesized by attaching polar groups to 6, 6`-positirn of 1,2-bis(2-methylberuo[b]thiophene-3-yl )hehexafluorocyclopentene(BTF6). The color of the diarylethene derivatives was changed to red upon excitation with a ultraviolet light(325 nm) and disappeared by irradiation with a visible(λ>500nm) light. Photochromic cyclization reactions and fluorscence properties of the diarylethene derivatives were influenced by the substituent in the aryl group. High fluorescene quantum yield was observed in the diarylethene derivative having low photochromic quantum yield, indicating that fluorescence originates from the exited state of a parallel isomer.
조현길(Hyun-Kil Cho),이은웅(Eung-Woong Lee),김준호(Jun-Ho Kim),정종호(Jong-Ho Jeong),김일중(Il-Jung Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
To investigate a arc behavior when the flux density linking arc current is different, two kinds of models having the different flux density with each other are proposed. Calculations of the flux density and the electromagnetic force acting on arc column using finite element method is described in this paper. And, arc behavior photographs by the high speed camera are illustrated at breaking DC 100V, 100A on the resistance load. So, the arc driving forces are compared with according to the arc types.
감자의 4x×2x 종간교잡 후대 식물체의 배수성 차이에 따른 氣孔細胞의 量的形質 變化와 반수체식물 선발효과
Hyun Mook Cho(趙賢默),Hei Young Kim-Lee(金惠英),Il Gin Mok(睦一振) 한국육종학회 1994 한국육종학회지 Vol.26 No.1
To select haploids from the progeny plants obtained by interploidal and interspecific crosses of potatoes, stomatal cell characters were examined at three different growth stages as a potential indicator of ploidy level. The mean stomatal cell densities were 66.9, 45.0 and 38.5 per unit area(34 ㎛²) in haploid, triploid and tetraploid plants, respectively. The length and width of stomata were 27.5 : 18.8㎛, 34.3 : 21.0㎛ and 36.5 : 22.0㎛ in haploid, triploid and tetraploid plants, respectively. These characters had significant differences between ploidy levels with in the progeny plants but had relatively large quantitative variation within ploidy levels. On the other hand, the number of chloroplasts in a pair of guard cells, having the mean of 12.2, 18.4 and 20.2 in haploid, triploid and tetraploid plants, respectively, had large differences between ploidy levels with narrow variation within a ploidy level. These results indicated that counting chroloplasts in the guard cells among stomatal cell characters could be adopted as a rapid and accurate method for identifying haploids from large number of progeny plants of interploidal and interspecific crosses.
Chloroquine 내성 유입 말라리아 14 예에 대한 Halofantrine 의 치료효과
조현장(Hyun Jang Cho),노성민(Sung Min Noh),이상도(Sang Do Lee),부철수(Cheol Su Poo),김성일(Sung Il Kim),김두형(Du Hyeong Kim),김승영(Seung Young Kim),박병엽(Byeung Yeub Park) 대한내과학회 1997 대한내과학회지 Vol.53 No.4
N/A Objectives: The prevalence of malaria is increasing in recent years and also multidrug resistant malaria is increasing around the world and there is an increasing concern about imported malaria in nonendemic areas. Now many drugs are tried to find out effect on multidrug resistant malaria. We performed this study to investigate the thrapeutic effect of halofantrine in the treatment of chloroquine resistant imported malaria. Methods: From Feb. 1992 to May 1995, we experienced 35 patients infected with malaria and treated 14 patients among 35 patients with halofantrine. Results: 1) All 14 patients were sailor with a mean age of 39.4 years and infected with malaria. 2) The majority of patients were infected with malaria at Africa. 3) 10 patients were infected with Plasmodium falciparum and the remainder were undetermined. 4) In the 11 cases of chloroquine resistant malaria treated with quinine plus tetracycline combination therapy or Fansidar, 4 cases could not be tolerable due to side effects and resistance to the therapy, we substituted halofantrine for above regimens. 5) In the 10 cases, treated after May 1994, halofantrine was the first choice of treatment because they were the cases of malaria infected in the mid-Africa where the prevalence of chloroquine resistant malaria is high. 6) With halofantrine, all 14 cases were treated with minimal side effects suc4 as nausea, vomiting, anorexia, abdominal pain and fatigue. Conclusion: We think halofantrine is a simple and effective regimen against chloroquine resistant malaria and consider this agent as an alternative therapeutic regimen on chloroquine resistant malaria.
임신 초기 3차원 초음파로 양막대를 확인한 뇌없음증이 동반된 양막대 증후군 증례
조현진 ( Hyun Jin Cho ),김연미 ( Yeon Mee Kim ),전균호 ( Gyun Ho Jeon ),전성욱 ( Sung Wook Chun ),정철회 ( Chul Hoi Jeong ),지용일 ( Yong Il Ji ) 대한산부인과학회 2011 Obstetrics & Gynecology Science Vol.54 No.3
Amniotic band syndrome (ABS) is entrapment of fetal parts by disrupted amnion and formation of fibrous amniotic band. As results, it causes a variety of fetal malformation involving the limbs, the craniofacial region and trunk. A visualization of free floating amniotic band is appropriate diagnostic method for ABS. Three dimensional (3D) and four dimensional (4D) ultrasounds are useful to diagnosis ABS. However prenatal diagnosis is difficult especially when they do not circulate a limb or cause single abnormality. In the cases of anencephaly, a differentiation between ABS and primary neural tube defect is important because the recurrence rate is significantly different. We reported a case that a fetal anencephaly with hydrops was diagnosed using prenatal 3D and 4D ultrasound then confirmed as amniotic band syndrome by autopsy at 12 weeks of gestation. After autopsy, we demonstrated amniotic band through 3D ultrasound review.