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지국섭,김광원 대한치과교정학회 1996 대한치과교정학회지 Vol.26 No.2
이 연구는 악안면 영역의 심미적 개선에 필요한 미소의 형태에 대한 기준을 설정하기 위하여 시행하였다. 성인 정상교합자 62명(남자:30명, 평군연령;22.7세, 여자;32명, 평균연령;21.8세)을 대상으로 안정위시와 미소시의 얼굴 정면 사진을 촬영하였고, 미소시 입술의 형태변화, 그리고 입술과 치아와의 관계를 계측, 분석하였다. 이 연구로부터 얻어진 결과는 다음과 같다. 1. 하순 상연의 만곡과 상악 절단연과의 평행관계인 smile line ratio는 0.09이었고, buccal corridor ratio는 0.63, smile symmetry ratio는 0.96이었다. 2. 미소시 양 구각주 간의 거리는 안정위시 구각부 간 거리의 1.31배였으며, 얼굴 폭의 0.48배였다. 3. 미소시 상순의 수직길이는 안정위시 길이의 0.69배였고, 하순의 수직길이는 안정위시 길이의 0.96배였다. 4. 상악 전치의 노출량은 9.96mm이었고, 상악 전치의 노출은 미소시 상순의 수직길이의 변화율이 었고, 미소시 구각부 길이의 비, buccal corridor ratio등과 관계 깊었다. This study was performed to mark the criteria of the eathetic smile that was necessary to improve the esthetic problem in oral maxillo-facial region. The facial straight photographs of 62 adults(30 males, 32 females : 19-24 years old) in resting position and during smile were taken. The measurements and proportion of lip-teeth relationship during smile were statistically analized with photogrammetry. The following results were obtained: 1. In the evaluation of the change of lips, smile line ratio was 0.93, buccal corridor ratio was 0.63, and smile symmetry ratio was 0.96. 2. The width of mouth during smile was 1.31 times of the width in the resting position and 0.48 times of face width. 3. The upper lip height during smile was 0.69 times of the height in the resting position and the lower lip height during smile was 0.93 times of the height in the resting position. 4. The mean exposed lenght of upper central incisor was 9,.96mm. Maxillary incisor exposure was significantly correlated with the upper lip change ratio, mouth width changer ratio, and buccal corridor ratio.
김경님,지국섭,김중한,이승미,김미애,박형수,임한호,윤영주,김광원,박관수 朝鮮大學校 口腔生物學硏究所 2000 口腔生物學硏究 Vol.24 No.2
Even though congential missing of mandibular incisors is lower incidence than that of maxillary lateral incisors of premolars, it makes orthodontic treatment complicated, and then clinical orthodontists should be familiar with treatment alternatives. The treatment techniques used in resolving that cases depend on a myriad of diagnostic criteria such as dental, skeletal and aesthetic considerations. Be based on this consideration, the orthodontists must decide whether to retain or open space for prosthodontic treatment or to closure space with potential excessive overbite of the anterior teeth or to extract maxillary teeth for tooth material balance. The following case reports document three patients with one or two congenitally missing mandibular teeth who were treated by opportunely selected treatment modality.
다중벽 탄소나노튜브를 함유한 PC/ABS 복합재의 마모 특성 및 다중벽 탄소나노튜브의 유출 평가
이현우(Hyun-Woo Lee),김경식(Kyung-Shik Kim),이재혁(Jae-Hyeok Lee),김효섭(Hyo-Sop Kim),김재호(Jae-Ho Kim),오동훈(Dong-Hoon Oh),류상효(Sang-Hyo Ryu),장영찬(Young-Chan Jang),김재현(Jae-Hyun Kim),이학주(Hak-Joo Lee),김광섭(Kwang-Seop Kim 한국트라이볼로지학회 2014 한국윤활학회지(윤활학회지) Vol.30 No.5
Carbon nanotubes (CNTs) are used in various composite materials to enhance electrical, thermal and mechanical properties of composite materials. In this study, we investigate the wear characteristics of polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends containing multi-walled carbon nanotubes (MWCNTs). PC/ABS blends are commonly used in many industrial applications such as cellular phones and display cases and MWCNTs have been added to the PC/ABS blends to improve their electromagnetic interference shielding (EMS). We performed wear tests on PC/ABS blends containing MWCNTs under reciprocating linear sliding conditions with chrome steel balls as a counterpart material. The normal loads were 10, 30, 50, 70, 100 N, the sliding speed was 10 mm/s, the stroke length was 15 mm, and the tests lasted 900 s. The MWCNTs included in the PC/ABS blends lower the wear volume and friction coefficient of the composites. We analyzed the wear debris collected from the composites during the tests in terms of the MWCNT concentration using inductively coupled plasma optical emission spectroscopy. The results show that the quantity of MWCNTs in the debris is proportional to the concentration of MWCNTs in the composite, indicating that the exposure of the MWCNTs to environments by wear could be increased with their concentration in the composite.
고온성 Bacillus amyloliquefaciens NS 15-4가 생산하는 내열성 Protease의 특성
김형권,김기현,이정기,김영옥,남희섭,오태광 한국산업미생물학회 1995 한국미생물·생명공학회지 Vol.23 No.3
탈지대두박의 분해능이 뛰어난 단백질가수분해 효소를 생산하는 고온성 세균을 토양으로부터 분리하였다. 이 균은 형태적, 생리적 특성으로부터 Bacillus amyloliquefaciens로 동정되었다. 이 균을 탈지대두박이 포함된 배지에 접종하고 50℃에서 진탕배양한 후, 균이 생산한 단백질가수분해효소를 ammonium sulfate 침전, DEAE-, CM-sepharose, phenyl-sepharose column을 통해 분리하였다. SDS-PAGE로부터 이 효소의 분자량이 약 30,000 임이 밝혀졌으며 N 말단의 아미노산 서열이 AQSVPYGISQIKAPA인 것으로 분석되었다 .이 효소의 반응최적온도는 60℃, 반응최적 pH는 11이었고, Ca^(++)에 의해 효소의 열안정성이 증가하였다. 또한 이 효소는 PMSF에 의해서 효소활성이 저해되는 serine protease로 판명되었다. 특히 기존의 다른 단백질가수분해효소와 비교하였을 때 물에 대한 용해도가 낮은 탈지대두박에 대해서 가수분해 역가가 큰 것으로 밝혀졌다. A thermophilic bacteria showing proteolytic activity against defatted soybean was isolated from soil. It was identified as Bacillus amyloliquefaciens based on its morphological and physiological characteristics. The Bacillus amyloliquefaciens NS 15-4 was cultivated at 50℃ by rotary shaking in a medium containing defatted soybean. An extracellular protease from this strain was purified to homogeneity by ammonium sulfate precipitation, ion exchange, and hydrophobic interaction chromatographies. The molecular weight of the enzyme was estimated to be approximately 30,000 by SDS-PAGE and the N-terminal amino acid sequence of the enzyme was turned out to be AQSVPYGISQIKAPA. The optimum temperature and pH for the enzyme reaction were 60℃ and 11, respectively, and its thermostability was increased by the addition of calcium ion. The enzyme was inactivated by phenylmethylsulfonylfluoride, suggesting it be a serine protease. Comparing with other commercial proteases, the enzyme showed relatively high proteolytic activity against defatted soybean, a water-insoluble protein substrate.
Hairy Root Cultures of Taxus cuspidata for Enhanced Production of Paclitaxel
Kim, Jung-A,Baek, Kwang-Hyun,Son, Young-Mi,Son, Sung-Ho,Shin, Heung-Sop The Korean Society for Applied Biological Chemistr 2009 Applied Biological Chemistry (Appl Biol Chem) Vol.52 No.2
Hairy root cultures were established by transforming seedlings of Taxus cuspidata Sieb. Et Zucc (Korean yew) using Agrobacterium rhizogenes. Initially, 107 lines of hairy roots were induced by infection with 3 strains of Agrobacterium (R1000, A4, and 15384), however, only three lines generated from the R1000 strain were stably grown on hormone-free media over 10 months of successive cultures. These lines were designated as RC11104, RC11105 and RC11106. The hairy root line RC 11106 was selected for further experiments for taxol production based on its growth properties. Upon methyl jasmonate treatment, the RC11106 line accumulated 52.5 mg/L of taxol over 2 weeks of incubation at a 20-L culture scale.