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ICP(Inductively Coupled Plasma) 처리에 따른 n-type SiGe/Metal contact의 SBH(Schottky Barrier Height) 연구
김이곤,장호원,전창민,송영주,강진영,심규환,제정호,이종람 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.2
The effect of surface treatment of n-type SiGe using the inductively coupled plasma (ICP) was studied by current-voltage and x-ray photoemission spectroscopy measurements. The ICP treatment produced surface oxides and point defects at the surface of SiGe. The x-ray photoemission spectroscopy measurements showed that atomic ratio of Ge/Si was increased after the etching treatment. These results provide the evidence that Si vacancies were produced at the etched surface. Si vacancies acting as donor for electrons resulted in shift of Fermi level to near the conduction band. As a result, Fermi level could be pinned at such Si vacancies, leading to the remarkable reduction of Schottky barrier height and the reduced dependence of Schottky barrier height on metal work function. (Received September 7, 2004)
한국산 야생등줄쥐 (Apodemus Agrarius coreae)의 대뇌피질과 줄무늬체에서 Neuropeptide Y 면역반응신경세포의 분포
이경열(Kyoung-Youl Lee),박일권(Il-Kwon Park),송치원(Chi-Won Song),권효정(Hyo-Jung Kwon),박미선(Mi-Sun Park),김무강, 정영길(Young-Gil Jung),이강이(Kang-Iee Lee),이철호(Chun-Ho Lee),현병화(Byung-Hwa Hyun),최농훈(Nong-Hun Choe) 대한해부학회 2001 Anatomy & Cell Biology Vol.34 No.2
Neuropeptide Y (NPY)는 돼지의 뇌에서 처음 분리 추출된 이후 여러학자들에 의해 여러동물의 뇌에 존재함이 밝혀졌으 며 이런 NPY는 신경조절물질 또는 신경활성물질에 관여하는 것으로 있려져 있다. 본 연구에서는 한국산 야생등줄쥐 (apodemus agrarius cereae)의 대뇌피질과 줄무늬체에서의 NPY면역반응신경세포체의 분포를 관찰하고자 면역조직화학염 색을 실시하여 관찰하였던 바 다음과 같은 결론을 얻었다. 1. 야생등줄쥐의 대뇌피질에서 NPY면역반응신경세포체가 모든 층에서 출현하였으며 특히 V층과 VI층에 주로 분포하 였고 I층과 VI층에서는 드물게 나타났다. 2. 대뇌피질에서 NPY면역반응신경세포체의 모양은 타원형, 난원형, 뭇각형 등 다양하게 존재하였고 I층과 II층에서는 원 형과 타원형이 많았으며 V층과 VI층에서는 뭇각형이 많았다. 세포돌기는 두극형 또는 뭇극형으로 존재하였는데 그 세포돌기의 주행방향이 I층과 II층에서는 연질막 (pia mater)과 평행으로 III층에서 두극형의 세포는 수직방향으로 그 돌기가 뻗어 있었으며 VI층에서는 뇌량과 평행하게 주행하고 있었다. 세포체의 크기는 중간크기 (10~20 μm)의 세포가 대부분이고 20 μm 이상인 세포는 드물게 관찰되었다. 3. 대뇌피질의 부위별 분포는 후각뇌주위피질에서 그 수가 가장 많이 나타났고 두정피질에서 그 다음으로 많이 나타났 으며 팽대뒤피질에서는 가장 적은 것으로 나타났다. 그러나 섬피질에서는 갯수는 적으나 그 밀집도가 높았다. 두정피 질부위에서는 대개 III-VI층에 주로 분포하였고 전두피질에서는 다른 부위보다 II층에 많은 세포체가 존재하였다. 4. 줄무늬체에서의 NPY면역반응신경세포체는 꼬리-조가비핵에서만 관찰되었으며 뒷쪽으로 갈수록 그 수가 줄어들었고 중간부위에서는 NPY면역반응신경세포체가 배쪽내측부분에 많이 분포되어 있는 것을 볼 수 있었다. 5. 줄무늬체에서의 NPY면역반응신경세포체의 모양은 타원형, 난원형, 뭇각형 등 다양하였으나 주로 뭇각형이 많았으며 그 세포돌기도 사방으로 뻗어있었고 그 크기는 15~20 μm로 중간세포가 대부분이었다. Neuropeptide Y (NPY) was first isolated from porcine brain. This discovery has led some workers to study the distribution of this peptide in the central nervous system of various mammals. In this study examined the distribution pattern of NPY-immunoreactive (NPY-IR) neurons in the Striped Field Mouse (Apodemus agrarius coreae) cerebral cortex and striatum, using immunohistochemical method. The results obtained in this study were summarized as followings. 1. NPY-IR neurons distributed in all layer of cerebral cortex. The number of neurons were higher in layer V and VI than in layer I and IV. 2. The shape of neurons was predominantly round or oval in layer I and II, and triangular in layer V and VI. And the processes were parallel to pia mater in layer I and II and were vertical in layer III. 3. The highest number of NPY-IR neurons were found in the perirhinal cortex but a few distinct population were found in the retrosplenial cortex. 4. In stiatum NPY-IR neurons were observed only in caudate-putamen nucleus. 5. The Immunoreactive neurons in caudate-putamen varied in their shape, but most of them were triangular or multiform neurons had omnidirectional processes.
발생중인 병아리의 사이뇌에서 NPY 양성반응세포의 분포
이미영,박일권,이경열,권효정,송치원,박미선,이강이,하권수,김원식,김무강,Lee, Mee-Young,Park, Il-Kwon,Lee, Kyoung-Youl,Kwon, Hyo-Jung,Song, Chi-Won,Park, Mee-Sun,Lee, Kang-Iee,Ha, Kwon-Soo,Kim, Won-Sik,Kim, Moo-Kang 대한수의학회 2002 大韓獸醫學會誌 Vol.42 No.1
This study deals with the distribution and morphological study of the neurons with the neuropeptide Y (NPY) in developing chick brain. The developing brains of Korean native chicks at embryonic days 8 (E8), E10, E12, E14, E16, E18, and E20 were used. The chicks were perfused with 4% paraformaldehyde through the left ventricle and aorta. The brains were removed and transferred into 30% sucrose, and then cut in a cryostat into $60{\mu}m$ in thickness. The sections were immunostained with free-floating and avidin-biotin complex (ABC) methods. The numerous neurons with NPY were first observed in nucleus rotundus of diencephalon at E8. In particular, neurons in nucleus rotundus had the well-developed processes. At E12, the neurons with NPY were distributed widely in diencephalon; nucleus septalis lateralis, medialis, nucleus magnocelluaris preopticus dorsalis, medialis, ventralis, nucleus preopticus medialis, nucleus dorsolateralis anterior thalami pars magnocellularis, and nucleus paraventricularis magnocellularis (paraventricular nucleus) except nucleus rotundus. From E12 to E20, positive neurons were oval-shaped, changed gradually into the spherical- and multipolar-shaped. The shapes of processes were also omnidirectional and the number of those were less than in telencephalon. As the chicks developed, the morphology of neurons with NPY showed the tendency to increase in their sizes and numbers.
한국재래산양 태아 및 신생아 척수에서 GFAP 면역반응세포에 관한 형태학적 연구
송치원,정수연,이근좌,이강이,이경열,박일권,박미선,정승혁,조규완,김무강,Song, Chi-Won,Chung, Soo-Youn,Lee, Keun-Jwa,Lee, Kang-Iee,Lee, Kyoung-Youl,Park, Il-Kwon,Park, Mi-Sun,Chung, Seung-Hyuk,Cho, Gyu-Woan,Kim, Moo-Kang 대한수의학회 2001 大韓獸醫學會誌 Vol.41 No.4
Glial fibrillary acidic protein(GFAP) is one of the intermediate filaments, and used as an astrocyte detection marker. GFAP distribution has been studied on the fetal, neonatal and aged brains. In this study, the GFAP immunoreactive cell localization and distribution in the fetal (30, 45, 60, 90, 105 and 120 days of gestation) and neonate spinal cords of Korean native goat were investigated by immunohistochemistry. Nonpolar radial glial cells initiated to appear at 45 days of gestation. GFAP-immunoreactive processes were extended from central canal to pia matter. Bipolar immumoreactive cells were transformed to monopolar and multipolar immunoreactive cells at 45 days of gestation. Multipolar astrocytes of 60 days of gestation were found within white and gray matters of spinal cord. The number of GFAP-immunoreactive cells were gradually decreased from 90 days of gestation until newborn neonate. The intensity of GFAP immunoreactivity was gradually decreased from 95 days of gestation until newborn neonate. These results suggest that the radial glial cells within the gray and white matters of spinal cord are very fast developed.
박일권,송치원,이경열,권효정,김무강,이강이,정영길,이남섭,하권수,Park, Il-kwon,Song, Chi-won,Lee, Kyung-youl,Kwon, Hyo-jung,Kim, Moo-kang,Lee, Kang-iee,Jeong, Young-gil,Lee, Nam-seob,Ha, Kwon-soo 대한수의학회 2000 大韓獸醫學會誌 Vol.40 No.3
The locus coeruleus(LG) is known to be observed a sexual dimorphism in rat CNS. LC is the largest collections of norepinephrine(NE)-containing neurons in the mammalian brain. Especially in rat, all LC neurons contained NE unlike other mammalians, so that specific reactions were found in the tyrosine-hydroxylase(TH) immunoreactive neurons. Sexual dimorphism of rat LC has affected by genes before sex hormone appeared, thereafter affected by sex hormones. In these day, many scientists founded morphological differences between male and female LC morphology, but differences of entire structure was not founded. Thus we investigated sex differences of the LC neuron's morphology in rat by three-dimensional(3-D) reconstruction using Confocal laser scanning microscopy(CLSM). We reported that neuron's shape was relatively-large multipolar neurons and neuron's processes in dorsal LC proceeded to ventral direction in the male and female rat. Male had a longer anterior-posterior length than female had in dorsal LC. In addition to middle-LC, male rat's LC had a more thicker posterior region but had not viewed in a previous study. In reverse, female rat's LC had a thicker anterior region like a previous study. This results using 3-D reconstruction by CLSM showed that the male's LC was more wide-ranging than female's relatively.