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      • Fluoxetine이 Schedule-Induced Polydipsia가 유발된 백서 뇌에서 Tyrosine Hydroxylase 발현에 미치는 영향

        이기철,이정호,최영민,정주호,정홍경,이용민,김도형,이대환 大韓神經精神醫學會 2001 신경정신의학 Vol.40 No.2

        연구목적: Fluoxetine은 serotonin을 매개하여 간접적으로 dopamine 신경전달기능을 억제한다고 추정되고 있다. 또한 운동장애에서 운동기능의 악화를 유발한다고 알려져 있다. 그러나 신경세포체에서 fluoxetine이 dopamine에 어떠한 영향을 주는지는 아직까지 확실치 않다. 저자들은 schedule-induced polydipsia를 유발시킨 백서 뇌의 흑질, 복부피개영역, 미상핵에서 tyrosine hydroxylase(TH) 발현이 저하됨을 발견하였다. 이를 통해서 fluoxetine이 백서 뇌의 dopamine 기능에 긍정적인지 혹은 부정적인지를 규명하고자 하였다. 방법: 4주간의 schedule-induced polydipsia 과정을 거친 백서에서 면역죄치화학적인 방법으로 흑질, 복부피개영역, 미상핵의 tyrosine hydroxylase 발현이 저하됨을 확인한 후, 실험동물들에게 fluoxetine 10mg/kg를 3주간 복강내 주사하였다. 실험백서들을 희생시켜 뇌 조직을 적출하여, TH 면역조직화학 염색법을 이용하여 흑질, 복부피개영역, 그리고 미상핵의 TH 면역반응세포를 관찰하고 이를 정상백서와 비교하였다. 결과: 1) 다갈증이 유발된 백서의 흑질, 복부피개영역, 미상핵에서 tyrosine hydroxylase 발현이 정상백서 보다 저하됨을 관찰하였다. 2) 3주간에 걸친 fluoxetine 투여후 흑질, 복부피개영역, 미상핵의 tyrosin hydroxylase 발현이 다시 증가하는 소견을 보였다. 결론: Fluoxetine 만성투여가 흑질, 복부피개영역 그리고 미상핵의 tyrosin hydroxylase를 증가시키는 소견을 얻었다. 이러한 결과는 임상에서 dopamine 결핍과 연관된 질환들에서 fluoxetine을 만성투여하면 운동기능을 포함한 증상들의 개선을 가져올 수도 있다고 추정된다. Objective: It has been suggested that fluoxetine inhibits the dopaminergic neurotransmission by serotonergic mediation. And also, it has been shown to inhibit synthesis of DOPA in dopamine-rich areas of the rat forebrain. These dopamine-antagonistic capacity of fluoxetine is only supported by anecdotal report that the increased amount of motor disability in patients with idiopathic Parkinson's disease after exposure to fluoxetine. However, there is still no evidence of the direct effect of fluoxetine on dopaminergic neuronal cell body in the substantia nigra, VTA, caudate & putamen. This study was designed to evaluate the effects of fluoxetine in rat brain which showed decreased numbers of dopaminergic neuronal cell body induced by schedule-induced polydipsia(SIP). Method: We incidentally found that 4 weeks of schedule-induced polydipsic rats revealed the suppression of tyrosine hydroxylase expression in the substantia nigra, VTA, caudate & putamen with the immunohistochemistric measures. After 3 weeks of intraperitoneal injection of 10mg/kg of fluoxetine to the schedule induced polydipsic rats, the tyrosine hydroxylase expression was also measured with immunohistochemistry. We compared the tyrosine hydroxylase expression among the normal control, the polydipsic rats, and the rats with fluoxetine treatment. Results: 1) By contrast with the control, the polydipsic rats revealed the evidence of decreased tyrosine hydroxylase expression in the substantia nigra, VTA, caudate & putamen. 2)After daily injection of fluoxetine for 3 weeks, the polydipsic rats showed increment of tyrosine hydroxyase expression in those areas. Conclusions: In previous studies, a great deal of results suggest that fluoxetine negatively influence the dopaminergic systems indirectly via serotonergic activation such as inhibition of dopamine synthesis or transport system. Although our results are obtained from rodents, we suggest that fluoxetine directly and positively enhance the dopamine system in the substantia nigra, VTA, caudate & putamen. The chronic adminstration of fluoxetine may be helpful to dopamine-depleted condition in clinical situations. We anticipate the replication studies of our findings and well-controlled clinical trial.

      • KCI등재
      • KCI등재후보

        Discordance in Spirometric Interpretations Based on Korean and Non-Korean Reference Equations

        Nami Kim,Mi-Hee Park,Se-yeong Kim,Chunhui Suh,Sangyoon Lee,Kun-Hyung Kim,Chae-Kwan Lee,Dae-Hwan Kim,Jong-Tae Lee 대한직업환경의학회 2013 대한직업환경의학회지 Vol.25 No.-

        Objectives: Korean regression models for spirometric reference values are different from those of other ethnic groups. The purpose of this study was to evaluate discordance in spirometric interpretations based on using Korean reference equations versus non-Korean reference equations. Methods: Spirometry was performed on 825 Korean male workers from April 2009 to November 2011. The spirometric patterns and disease severity were evaluated using two Korean equations (Choi’s and Lee’s) and three equations for Caucasians (NHANES III, Morris’s, and Knudson’s), and the results of Choi’s equation were compared with the non-Korean equations. The spirometric patterns were defined as normal, restrictive, and mild and moderate obstructive. Results: The mean differences in the FEV1% and FVC% between the two Korean equations were 2.0 ± 1.3% and 3.5 ± 2.2%, respectively. Morris’s equation had the greatest difference in the FEV1% from Choi’s equation: 32.9 ± 8.5%. Knudson’s equation had the greatest difference in the FVC% from Choi’s equation: 10.5 ± 6.5%. Conclusions: The two Korean equations shared similar characteristics of spirometric interpretation. The spirometric interpretations of Choi’s equation were significantly different from those of Morris’s equation and Knudson’s equation.

      • 알루미늄 연속주조 용탕의 탈 가스 일체화 장치 개발

        이용중,김태원,김기대,류재엽,이형우 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

        It is necessary for managing a perfect process for degasing aluminum molten metal according to the increase of a grade of aluminum and its alloy products. There are some methods that have been used to manage a degasing process in recent years, such as an injection method that uses aluminum molten metal powder and chemicals supplier and input method that supplies argon and nitrogen, or chlorine gas by using a gas blow-tube. However, these methods show some problems, and it shows that it is a difficult process to handle, pollution due to the producing a lot of toxic gases like chlorine and fluoride gas, irregular effects, and lowering work efficiency due to the excessive processing time. The problems that are the most fatal are the producing a lot of sludge due to the reaction of aluminum molten metal with chemicals, loss of metals, and decreasing the life of refractory materials. In order to solve these problems, this paper develops a technology that is related to aluminum continuous casting molten metal and monolithic degasing apparatus. A degasing apparatus developed in this study improved the existing methods and prevented environmental pollution with smokeless, odorless, and harmlessness by using a new method that applies argon and nitrogen gas in which the methods used in the West and Japan are eliminated. The developed method can significantly reduce product faults that are caused by the production of gas and oxidation because it uses a preprocessed molten metal with chemicals. In addition, the amount of the produced sludge can also be reduced by 60~80% maximum compared with the existing methods. Then, it makes it possible to minimize the loss of metals. Moreover, the molten metal processing and settling time is also shortened by comparing it with the existing methods that are applied by using chemicals. In addition, it does much to improve the workers' health, safety and environment because there is no pollution. The improvement of productivity and prevention effects of disaster from the results of the development can be summarized as follows. It will contribute to the process rationalization because it does not have any unnecessary processes that the molten metal will be moved to an agitator by using a ladle and returned to process for degasing like the existing process due to the monolithic configuration. There are no floating impurities due to the oxidation caused by the contact with the air as same as the existing process. In addition, it can protect the blending of precipitation impurities. Because it has a monolithic configuration, it can avoid the use of additional energy to compensate the temperature decreasing about 60? that is caused by the moving of molten metal. It is not necessary to invest an extra facilities in order to discharge the gas generated from a degasing process by using an agitator. The working environment can be improved by the hospitable air in the factory because the molten metal is almost not exposed in the interior of the area.

      • 단일항 여기 산소에 의한 광용혈에 미치는 D-mannitol, ascorbic acid, aspirin 및 sodium azide의 영향

        이대형 春川敎育大學 1991 論文集 Vol.31 No.-

        The effects of the D-mannitol, ascorbic acid, aspirin and sodium azide against the singlet oxygen induced photohemolysis were investigated. D-Mannitol and ascorbic acid were particulary effective in blocking the photohemolysis, when they were added to the RBC solution before and after irradiation. And sodium azide was effective only when it was added before irradiation. These results indicated that RBC was damaged mainly by singlet oxygen during irradiation, but other active oxygen species such as hydroxy radicals were found out to participate in lysis during post-incubation period. And the aspirin, which was known as inhibitor of cyclooxygenase, was also showed the protective effect only when it was added with relatively high concentration. Accordingly, it seems that the prostaglandin pathway is related with the singlet oxygen induced photohemolysis.

      • PLZT 세라믹을 이용한 SAW Filter의 특성

        이수대,이찬구,안형주,문준규 경남대학교 신소재연구소 2003 신소재연구 Vol.15 No.2

        현재 사용되고 있는 SAW 필터 기관물질 중 세라믹 기관은 다공정과 생산에 따른 물성의 재현성 부족을 제외한다면 단결정 기관에 비해 생산단가의 저렴화, 생산공정의 단순화 및 대량생산의 측면에서는 훨씬 경쟁력이 있다. 따라서 본 연구에서는 고온 압축성형법에 의해 1235℃의 온도와 200㎏/㎠의 압력에서 30시간동안의 제조조건에서 조성비 x/65/35(x=5-8)인 PLZT 세라믹 기관들을 제조하여 SAW필터로써의 응용가능성을 살펴보았다. 각 조성별 유전을, SAW 전파 속도, 기계결합계수 등을 측정 비교한 결과 SAW 필터 기관물질로 가장 적합한 조성비는 7/65/35였다. 이 조성비로 제작한 SAW 필터에서 상대적으로 양호한 출력 특성을 얻었고 단결정 기관으로 제작한 SAW 필터에 버금가는 특성을 확인할 수 있었다. The single crystal substrate has been the industrial standard for the design of SAW filters for a long time. However, the ceramics substrate had more simple fabricated process than the crystal. In this study, it was attempted that single crystal was substituted for PLZT(La/Zr/Ti = x/65/35, x=5∼8 at. %) ceramics. The ceramics substrate was prepared by hot-pressed method at temperature 1235C, 200㎏/㎠, 30hrs. The real permittivity, SAW velocity and mechanical coupling factor of PLZT ceramics were measured for a different La mol% content. In the results, we could observed that 7/65/35 composition SAW filter had a good characteristics of frequency response.

      • 계몽가사와 성적 욕망의 시적 인식 : 그 부정적 성 모타르의 역사적 의미

        이형대 고려대학교 민족문화연구원 한국문학연구소 2001 한국문학연구 Vol.- No.2

        The study is for explaining the matters of sexual desire in Gasa verses printed in newspapers in the period of enlightenment in the connection with female discussion at that time. Sexual restriction was expressly shown in the works of which the poetic objects are female. Enlighteners who regarded the sexual desire except for reproduction as a taboo, seemed to realize a control mechanism by identifying the immoral sexual desire with savagery. Especially the poetic expression of sex formed by severally satirizing Japanese disgusting sexual desire and Japan-friendly persons immoral sexual desire, displayed resistance against the crooked civilization and the promotion of national consciousness. This shows that the sexual discussion was placed between the establishment of national subjectivity to protect national rights and the strategy of national salvation to overcome the Japanese imperialism. In this viewpoint, the control of sexual desire related to sanitation has the same background. Along with this, it cannot be overlooked that the enlighteners were sick of women who started to leave their family which is a closing space and their desire before the new value of sex was established in the unstable age caused by the emancipation of social position and enlightenment. This fact can be found in the poetic expressions of horrible punishment on women who expressed their sexual desire. Womens sex could not escape from the boundary of family and monogamy. Social spaces allowed to women who were born again as the members of people, were just schools and labor markets where they could work for national salvation, education and the promotion of industry.

      • 跳馬 Handspring 動作의 力學的 分析

        李大珩,李勇仁,崔大雨 忠南大學校體育科學硏究所 1987 體育科學硏究誌 Vol.5 No.1

        Mechanical analysis of the handspring motion at the long horse vault has been made as follows: 1. On setting the hands on the long horse vault, the heights of the subject body from the ground were 102cm (Subject A)and 132cm (Subject B), respectively. Subject A maintained the center of the body 30cm lower than Subject B. 2. Subject A took 0.06 seconds less than Subject B as for the time required from the feet leaving the mat to setting the hands on the long horse. 3. On taking the hands off the long horse, the power consumed was 26.88HP (Subject A)and 2.08 HP (Subject B), respectively. 4. At phase 1, the mean of HO and He was 134.76cm (Subject A), and 162.08cm and 94.96cm(Subject B), respectively. 5. The landing preparation when the neck joint is flexed was 9˚ in the frame 23(Subject A)and 176˚in the frame 31(Subject B), respectively. That means that Subject A made an earlier landing preparation than Subject B. 6. In phase 2, the mean of force was 7869.71 Newton (Subject A)and 3672.79 Newton(p<0.01)(Subject B), respecrively. That shows that Subject A consumed more force than subject B. 7. Subject A set the hands on the long horse earlier than Subject B. Subject A had the better position, when taking the hands off the horse than Subject B. On setting the hands on the horse, Subject B failed in the right landing, because the knee joint was much overflexed.

      • 신경외과 중환자실에서 치료받은 환자들의 합병증 및 사망율에 대한 임상적 분석 : A Prospective Study of 200 Consecutive Patients

        이성운,박상근,김태홍,권점대,신형식,김상진 인제대학교 1997 仁濟醫學 Vol.18 No.2

        저자들은 본원 신경외과 중환자 관리의 개선을 위하여 1993년 2월부터 12월까지 중환자실에 입원하여 치료받은 환자 200명을 대상으로 합병증 및 사망율을 일정한 분석양식에 의하여 후향성 연구를 시행하였다. 전체 합병증 발생률은 16.5% 였으며, 환자의 의식 상태가 나쁘고 재원 기간이 길수록 빈도가 증가하였다. 합병증중에서 감염이 66.8%로 합병증 중 가장 많은 빈도를 보였으며, 감염 부위별로는 요도 감염(18.8%), 상처 감염(18.8%) 그리고 폐렴(16.9%) 순으로 많았다. 그외 합병증은 욕창(9.4%), 위장관 질환(7.5%), 피부 질환(7.5%) 순이었다. 사망자는 18명으로 전체 환자의 9%를 차지하였으며 그중 외상 환자가 11명(61%)으로 가장 많았다. 사망 원인은 패혈성 쇼크로 사망한 1명을 제외하고 나머지 모두는 두개강 내압 항진으로 중환자실에서 치료상 합병증에 의하여 사망한 것은 아니었다. 따라서 본 연구 결과 적합한 약물 요법, 적절한 인원 배치, 시설의 개선 및 종사자들에 대한 적극적인 교육 등을 통하여 중환자실에서의 환자 관리를 개선함으로써 합병증 및 사망율을 감소시킬 수 있을 것으로 사료된다. In order to improve the management outcome of patients in neurosurgical intensive care unit(NICU), the authors analyzed complications and mortality of 200 consecutive patients between February and December 1993. Complications were occurred in 33 patients (16.5%) among 200 patients who had been treated at NICU. Infection(66.8%) was the most common complication in our complication series and their detailed sites were urinary tract infection(18.8%), wound infection (18.8%) and pneumonia (16.9%). The motality rate was 9%. Increased intracranial pressure was the most common cause of death. Based on this study, the authors conclude that appropriate medical treatment, proper management and education for personnel and excellent equipments were key to prevention of complication and mortality.

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