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Study on Biocompatibility and Mineralization Potential of Capseal
배광식,장석우,김기연,이우철 대한치의학회 2014 Journal of korean dental science Vol.7 No.1
Purpose: Capseal I and Capseal II are calcium silicate and calcium phosphate based experimental root canal sealers. This study sought to evaluate the biocompatibility and mineralization potential of Capseal I and Capseal II. Materials and Methods: The biocompatibility and mineralization related gene expression (alkaline phosphatase[ALP], bone sialoprotein [BSP], and osteocalcin) of Capseal I and Capseal II were compared using methylthiazoltetrazolium assay and reverse transcription-polymerization chain reaction analysis, respectively. The results wereanalyzed by Kruskal-Wallis test. A P-value of <0.05 was considered signifi cant. Result: Both Capseal I and Capseal II were favorable in terms of biocompatibility, infl uencing the messenger RNAexpression of ALP and BSP. Conclusion: Within the limitation of this study, Capseal is biocompatible, with mineralization promoting potential;thus, it could be a promising root canal sealer.
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.