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Boletus rubinellus 에서 감수분열 (減數分裂) 및 감수분열후 유사분열 (有絲分裂)
윤권상,David J . McLaughlin (Kwon S . Yoon) 한국식물학회 1987 Journal of Plant Biology Vol.30 No.4
Meiosis and postmeiotic mitosis in Boletus rubinellus were examined ultrastructurally. Meiosis occurred at the apex of the basidium. A sausage-shaped spindle pole body(SPB) was observed along with the presence of synaptonemal complexes during pachytene and a diglobular SPB was present on late pachytene or diplotene nuclei. During metaphase Ⅰ, the monoglobular SPB at the spindle pole was surrounded by a membrane and the nuclear envelope was discontinuous. At anaphase Ⅰ, the chromosomes became better defined and formed a central spindle. The nucleolus was extruded from the nucleus. During anaphase Ⅰ, the SPB was excluded from the chromosomal region by a membrane and both poles were fully separated to opposite sides of the basidial wall. In meiosis Ⅱ, the two nuclei divided synchronously and the spindles were parallel. The spindles were smaller than in meiosis Ⅰ, while the SPB was approximately the same size as that of the similar stage in meiosis Ⅰ. During anaphasetelophase Ⅱ, the SPB was surrounded by a cap of endoplasmic reticulum(ER) that delimited it from the spindle. The postmeiotic interphase nuclei migrated to the mid-region of the basidium before migration to the spores. The SPB at this stage was diglobular. A postmeiotic mitosis occurred within the basidiospore, and the plane of the spindle was oblique to the long axis of the spore. The spindle and SPB were smaller than at meiosis Ⅰ and there were fewer nonchromosomal microtubules. At anaphase, the nucleolus was present inside the nuclear envelope but lateral to the spindle.
도마도 암종내 Agrobacterium tumefaciens의 동태에 대하여
윤권상,이민재,하영칠 한국미생물학회 1972 미생물학회지 Vol.10 No.1
The tomato plant, Lycopersicon esculentum Mill, was inoculated with tumor inducing strain, $A_6K_1$, of Agrobacterium tumefaciens and its produced tumors were examined with the electron microscope. A number of bacteria are usually detected in the intercellular region of the host plant, and it is observed that the host cytoplasm is readily destroyed in the region where the bacterial invasion occurred. Some of the bacteria in the host tissues are enclosed with the single unit membranes, in other locations lots of bacteroids were examined and the bacterial lysis is generally observed in those bacteroids. The bacterial movement in the tumor tissue and some peculiar relationships between the pathogens and the host plant are discussed.
Trimorphomyces papilionaceous 에서 laccase 의 catabolite repression 에 의한 조절
정해숙,최형태,윤권상 한국미생물학회 1992 미생물학회지 Vol.30 No.2
The dikaryon of Trimorphonzycc,.~ papilioncicc.ous, one of basidiornycetous yeast needed thiamine as a growth factor and required relatively simple nutrient components. This organism grem best at 25$^{\circ}$C. anci showed broad pH range (pH 4.0-7.0). It was groM,n in liquid minimal media with various carbon sources and they could be classilied into 3 groups as follows. Glucose. fructose. mannose, sucrose and xylose (A gi.oup) supportecl good growth (>OD 0.8), and showed poor laccase activity (less than 1.5 u'mg protein). Galactose and gluconate (B group) showed moderate growth (01) 0.3-0.6). and hail moderatc crlzyrne activity (4-6u). Arabinosc. lactose. maltose ant1 pyruvate (C 5roup) showed poor growth (OD 0.1-0.2). and showed high enzyme activity (higher than 8 u). Kibosc, acetate. citrate. lactate and oxaloacetate showed no growth. When the yeast was grown in a medium which had two carbon sources (glucose and arabinose). laccase was regul;~tecl by the cutahoiitc repression. 담자성 효모인 Trimorphomyces papilionaceous 는 생장에 thiamine 을 요구하는 최적배양온도는 25.deg.C 이며 넓은 범위의 pH (4.0-7.0) 에서 잘 자랐고 최소배지네 여러가지 탄소원을 가하고 (1%) 배양하여 균의 생장과 laccase 의 역가를 조사하였다. Glucose, frutose, mannose, sucrose 와 xylose 배지에서 OD 0.8 이상으로 자랐고 (A group), galactose 와 gluconate 의 경우 OD 0.3-0.6 (B group), 그리고 arbinose, lactose 와 pyruvate 배지에서 CD0.1-0.2 를 보였다. (C-group), Ribose, acetate, citrate, lactate 와 oxaloctate 는 이용하지 못하였다. Laccase 는 C group 배지에서 가장 높은 역가를 보였고 (8 u 이상), B group 배지에서 4-6 unit, A group 배지의 경우 가장 낮은 1.5 unit 이하를 보였다. 이균을 glucose 와 arabinose 가 혼합된 배지에 배양할 경우 laccase 는 catabolite repression 에 의하여 조절되었다.