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수용성 미셀용액에 가용화된 Acetanilide, p-diacetylbenzene 및 tetrabromo-p-quinone의 미세환경의 성질
高正秀,金信局,朴哲浩 木浦大學校 基礎科學硏究所 1994 基礎科學硏究誌 Vol.12 No.-
Solubilization of some carbonyl compounds such as acetanilide, p-diacetylbenzene and tetrabromo-p-quinone was investigated in a variety of aqueous micellar solutions by UV spectrophotometric method. The good linear relationship was obsorved between υ(n→π*)of these carbonyl compounds and solvent polarity parameter, ??, of some pure solvents. Themicroenvironmental polarity of these carbonyl compounds depended on the ionic properties of the surfactants, and decreased as cationic > anionic > nonionic.
고정훈,조동우,윤원수,김주한 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
In most of the existing mechanistic models, the cutting process simulation is often restricted to a single path machining operation under a fixed cutting condition. Complex cutting processes such as die or mold manufacturing, however, are performed under two- or three-dimensional multiple tool paths. Since the tool paths in CNC machining are composed of line and arc segments, transient cuts are frequently occured due to the multiple paths. Even in steady cuts, the width of cut is varied with each segment. In this regard, this paper deals with the development of process simulation system for transient cuts, where continuously changing cutting configuration is computed, and then the cutting forces are predicted.
역상 미셀계에 가용화된 Mesityl Oxide, N-Nitrosodime-thylamine 및 Isonicotinic Acid의 미세환경에 관한 연구
고정수 木浦大學校基礎科學硏究所 1986 基礎科學硏究誌 Vol.4 No.-
From the n→π* absorption maxima of mesityI oxide and N-nitrosodimethylamine, the polarities in the cavities of dodecylammonium propionate (DAP) and dodecylamonium butyrate (DAB), both aggregated in cyclohexane containg different amounts of water, were determined. The Dimroth polarity parameter, E?(30), was found to be increased linearly as the amounts of water increased. From the ¹H NMR measurements, water, mesityl oxide, N-nitrosodimethylamine and isonicotinic acid were found to be localized in the polar cavities of DAP and DAB when aggregated in carbon tetrachloride.
Sodium Dodecyl Sulfate의 표면장력에 미치는 Dodecanol의 영향
고정수,오세웅 목포대학교 기초과학연구소 2000 基礎科學硏究誌 Vol.18 No.-
The minima were found in the surface tension curve of commercial sodium dodecyl sulfates against its concentration. It couldn't be found minimum in the concentration - surface tension curve for the SDS, with its purity of more than 99%, produced by Fluka Chemical Co. Its CMC, surface excess, and surface tension above CMC were 7.86×10-2 M, 3.3×10-6 mol/m2, and 40.6 mN/m, respectively. These were in agreement with the previous results. Surface tension curves were shown for a series of SDS solutions containing dodecanol(DD) in the range of 0.1∼5.9%(W/W). As the amount of DD increased, the surface tensiion of SDS reduced and the concentration at the minimum of surface tension curve decreased. It might be reasonable that the CMC for the SDS solutioin containing DD is taken as the concentration at the minimum of surface tension curve.
폐결핵 환자 혈청에서 수용성 Interleukin 2 수용체 및 Adenosine Deaminase 활성도에 관한 연구
고정희,박성규,백상현,박찬권,박병수,안진영,최우석,박정규 충남대학교 의과대학 지역사회의학연구소 1993 충남의대잡지 Vol.20 No.1
Interleukin-2 (IL-2) induces T cell proliferation in an autocrine manner and provides a means by which antigen triggered T cells can be clonally expanded in vitro. During the following activation, the activity of IL-2 is mediated by specific high affinity IL-2 binding membrane receptors which are expressed shortly after activation. In this process, a 42 KD-fragment (soluble IL-2R) is continuously cleaved off and circulates as a soluble marker of T lymphocyte activation. Elevated level of soluble IL-2R has been identified in the serum of patients with malignant autoimmune and allergic disorders, systemic parasitic infection, undergoing graft versus host disease, acute or chronic lymphocytic leukemia and HIV-infection. ADA (adenosine deaminase) completes the process of differentiation of T cell and is essential for progression of T cell maturation. Therefore level of ADA is to correlated with magnitude of T cell immune response. The fact that expression of sIL-2R and ADA activity increases in peripheral blood T-lymphocytes of patients with active pulmonary tuberculosis suggests that T cell activation might have a major role in the pathogenesis of pulmonary tuberculosis. In order to evaluate the T cell immune response in pulmonary tuberculosis, we measured the serum concentration of sIL-2R and ADA activity in 17 patients with current pulmonary tuberculosis, 10 chronic inactive pulmonary tuberculosis, 10 as normal controls. (1) Current pulmonary tuberculosis had significantly higher levels of sIL-2R (237.24±95.47)when compared with those of inactive tuberculosis (78.6±11.06). and the control (68.17±15.4) group. (2) ADA activity in current pulmonary tuberculosis was significantly increased (34.41±20.63) when compared with those of inactive tuberculosis (24.7±14.36) and control (17.65± 5.94) group. (3) There was good correlation between sIL-2R concentration and ADA activity in serum in current pulmonary tuberculosis group. (4) sIL-2R concentration and ADA activity was decreased significantly 6 months after anti-tuberculosis drug medication. In conclusion, sIL-2R concentration and ADA activity in serum in current pulmonary tuberculosis group was increased when compared with those of inactive pulmonary tuberculosis and the control group. By the way, T cell mediated immune response was enhanced in current pulmonary tuberculosis, but in inactive chronic pulmonary tuberculosis who had treated by antituberculosis drug medication, the concentration of sIL-2R and ADA activity was nearly normal.
교흔으로 인해 발생한 Eikenella corrodens 간농양 1예
고근준,이은재,최형섭,김상수,최정은,임환섭,김준명,이꽃실 대한감염학회 2004 감염과 화학요법 Vol.36 No.2
E. corrodens는 면역저하 환자에서 주로 문제를 일으키며, 감염시 두경부, 폐, 복부 등에 위험을 초래할 수 있어 치료의 적절성에 대한 중요성이 부각되고 있다. Eikenella corrodens는 균 동정을 위해 CO₂의 공급을 필요로 하며 서서히 자라는 특성상 까다로운 배양조건을 필요로 하는 균주이다. 혐기성 균주이지만 metronidazole이나 clindamycin과 같은 항균제에는 반응을 안하는 특이한 항생제 감수성에 의해 보편적인 구강내 상재균에 대한 경험적 치료에 실패할 수 있다. 치료에 있어 잘못된 초기 항생제 선택이나 외과적 시술이 적절히 시행되지 않은 경우에 치료실패의 요인이 될 수 있으므로 적절한 항생제 사용과 함께 외과적 처치가 동반되어야 한다. 저자들은 정상 면역력을 가진 성인에서 사람에게 물리고 난 후 발생한 E. corrodens에 의한 간농양의 적절한 치료의 결과를 문헌고찰과 함께 보고하는 바이다. Eikenella corrodens is a slow growing, facultatively anaerobic gram-negative rod that is part of the normal flora of the oral cavity and upper respiratory tracts. In most patients with E. corrodens infections, host defenses are compromised due to surgery, or chronic debilitating illness such as malignancies, or immunosuppressive therapy. This organism causes abscesses and infections that are at times fatal. We experienced a case of E. corrodens isolated from liver abscess in an immunocompetent patient. A 50-year-old man who is a dentist, was hospitalized because of fever and myalgia of 10 days' duration. Abdominal ultrasonography showed non-septated, 3.8×4.6 ㎝ sized abscess in the segment 6/7 of the liver. E. corrodens was isolated from aspiration of liver abscess. This organism was presumably acquired from his patient's oral cavity during dental procedure. We hope that increased awareness to E. corrodens will raise the index of suspicion, and contribute to optimal management of these infections, minimizing the significant morbidity associated with this organism.
고영환,강경수,김재하,고정삼 濟州大學校 工科大學 産業技術硏究所 1991 産業技術硏究報告 Vol.2 No.-
Activated sludge process which has been widely applied t o the treatment of waste-water was slightly modified to remove hydrocarbons from wastewater. The process of wastewater treatment consisted of two consecutive reactors. Cells of Acinetobacter calcoaceticus were first cultivated in synthetic wastewater containing 3% (W/V) of hydrocarbons. The resulting culture was then exposed to acclimatized active sludge. Hydrocarbon concentrations of the effluent from the process were 0.19-0.21% (W/V). The contents of suspended solid were reduced to 17-53 ㎎/l. The data imply that A. calcoaceticus can be used for the treatment of wastewater containing hydrocarbons.
수용성 미셀용액에서 bromophenol blue와 methyl red 지시약의 pKa´값 결정
高正秀,吳世雄,李善華 木浦大學校 基礎科學硏究所 1994 基礎科學硏究誌 Vol.12 No.-
Solubilization of some acid-base indicators such as bromophenol blue and methyl red were investigated in aqueous micellar solutions by visible spectrophotometric method. The intrinsic dissociation constants on bulk solution, pKa' of some acid-base indicators were influenced by surfactant and related with charge characters of acid-base indicators and surfactants.