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SDS-PAGE를 이용한 Prevotella intermedia와 P. nigrescens의 감별에 관한 연구
배광식 大韓齒科保存學會 1997 Restorative Dentistry & Endodontics Vol.22 No.2
In 1992, Prevotella intermedia was shown to be comprised of another spoecies now known as Prevotella nigrescens. Strain ATCC 33563 is now designated the type strain of P. nigrescens while strain ATCC 25611 is remains the type strain of P. intermedia. The purpose of this study was to find the differences in protein profiles of P. intermedia and P. nigrescens, using sodium dodecy1 sulfate polyacrylamide gel electrophoresis, which can be used for differentiation of those two species. A partial amino acid sequence of the 18.6 kDa protein band, which was specific in P. nigrescens, was also determined. The cellular proteins were extracted from tbe cell pellets of pure cultures of P. interedia. and P. nigrescens by either sonication of being shaken continuously for 20 min at 21℃ with 1% SDS or being boiled for 3 min with 1% SDS. SDS-PAGE was performed according to the method of laemmli^15) using either 12% (w/v) gels or 18% (w/v) gels. Results were as follows ; 1. The similar electrophoretic protein profiles were shown by 3 cellular protein extraction methods for each strain.(Fig. 1 and 2) 2. The 18.6kDa band which was specific only in P. nigrescens could be used for the differentiation of P. intermedia. and P. nigrescens. (Fig. 1 and 2 Table 1) 3. A total of 4 different tryptic fraginents from the 18.6 kDa protein were sequenced. the resulting amino acidsequences were fragment 1.GNPVNIGGEW, 2.FNVVR, 3.NYLTVAPY, and 4.GGDNVTTYQVLPEIGYN. By comparison to the sequences of known proteins in the Swiss-Prot database and PIR database. 90% matching between fragment 1 and serine hydroxymethyl transferase(P24060) in the Swiss-Prot, and 90% matching between fragment 1 and glycine hydroxymethyl transferase(S15203) in the PIR were shown, but the identity and function of the 18.6 kDa protein remains unknown.
전자근관장측정기 Root ZX의 정확도에 관한 실험적 연구
강대훈,정관희,윤수한,배광식 大韓齒科保存學會 1998 Restorative Dentistry & Endodontics Vol.23 No.1
The purpose of this study was to evaluate the in vitro accuracy of Root ZX(Torita Co., Japan) which is the ratio type electronic apex locator. The 86 extracted human palatal roots of maxillary molar with fully formed apices were used. File lengths with the file tip just visible at the foramen were compared to those measured with Root ZX. For length measuring with Root ZX, saline test model with which the apical 1/3 of each root was submerged into normal saline were designed. The root canal lengths were determined with Root ZX and the radiographs were taken with a file in the canal. The distances from file tips of Root ZX lengths to apecies in radiographs also were measured with Profile projector PJ311(Mitutoyo Co., Japan). The results were as follows : 1. The root canal length determined with electronic apex locator was 0.78±0.53 mm shorter than the length with visual measurement. 2. The file tip of Root ZX lengths was located at 0.85±0.49 mm away from the apex in radiograph. 3. The accuracy of the Root ZX was 79.1% within 0.5mm of visual working length and 96.5% within 1.0mm.
한용식,김명배,오광철,유상필 한국화재소방학회 2001 한국화재소방학회논문지 Vol.15 No.1
수평 평판과 충돌하는 제트에 의해 생성되는 연기유동을 관찰하기 위해 질소가스에 kerosene연기입자를 뛰워 유동장을 가시화하였다. 광원으로는 아르곤-이온 레이져 평면광이 사용되었다. Kerosene smoke의 산란 광에 의한 수직평면 상(image)과 수평평면 상을 고속 CCD 카메라와 비디오 카메라로 녹화하였으며, 얻어진 영상으로부터 연기 선단의 순간속도 및 평균속도를 측정하였다. The flow induced by a vertically impinging circular jet under a horizontal plate is investigated by visualization technique, using kerosene smoke in nitrogen gas to visualize the vortex flow and impinging flow. The light source was the sheet beam of Ar-Ion laser. The vertical and horizontal images scattering of kerosene smoke were recorded by the high speed CCD camera and the video camera. The instantaneous velocity of the smoke front were measured from the acquisited images.