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Study on Springback Properties of Different Orthodontic Archwires in Archwire Bending Process
Jiang Jin-gang,Wang Zhao,Zhang Yong-de,Jiang Ji-xiong,Niu Suo-liang,Liu Yi 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12
The archwire bending is one of processes the most frequently used in the orthodontic treatment. Furthermore, the springback of sheet metal, which is defined as elastic recovery of the part during unloading, should be taken into consideration so as to produce formed archwire within acceptable tolerance limits. In this paper, the springback angle of different alloy archwires (including NiTi alloy wire, Beta-Ti alloy wires, Chinese stainless steel wires, and Australian stainless steel wires) were performed by the theoretical calculation based on large deformation theory and the finite element analysis. A series of numerical simulations has been conducted for the bending test, which physically simulates the actual bending of alloy archwire with a robotic apparatus. The finite element analysis of springback is shown to be very consistent with the theoretical calculation results.
Characterization of rDNAs and tandem repeats in the heterochromatin of Brassica rapa.
Lim, Ki-Byung,de Jong, Hans,Yang, Tae-Jin,Park, Jee-Young,Kwon, Soo-Jin,Kim, Jung Sun,Lim, Myung-Ho,Kim, Jin A,Jin, Mina,Jin, Yong-Moon,Kim, Seog Hyung,Lim, Yong Pyo,Bang, Jae-Wook,Kim, Ho-Il,Park, Be Korean Society for Molecular Biology 2005 Molecules and cells Vol.19 No.3
<P>We describe the morphology and molecular organization of heterochromatin domains in the interphase nuclei, and mitotic and meiotic chromosomes, of Brassica rapa, using DAPI staining and fluorescence in situ hybridization (FISH) of rDNA and pericentromere tandem repeats. We have developed a simple method to distinguish the centromeric regions of mitotic metaphase chromosomes by prolonged irradiation with UV light at the DAPI excitation wavelength. Application of this bleached DAPI band (BDB) karyotyping method to the 45S and 5S rDNAs and 176 bp centromere satellite repeats distinguished the 10 B. rapa chromosomes. We further characterized the centromeric repeat sequences in BAC end sequences. These fell into two classes, CentBr1 and CentBr2, occupying the centromeres of eight and two chromosomes, respectively. The centromere satellites encompassed about 30% of the total chromosomes, particularly in the core centromere blocks of all the chromosomes. Interestingly, centromere length was inversely correlated with chromosome length. The morphology and molecular organization of heterochromatin domains in interphase nuclei, and in mitotic and meiotic chromosomes, were further characterized by DAPI staining and FISH of rDNA and CentBr. The DAPI fluorescence of interphase nuclei revealed ten to twenty conspicuous chromocenters, each composed of the heterochromatin of up to four chromosomes and/or nucleolar organizing regions.</P>
Characterization of rDNAs and Tandem Repeats in the Heterochromatin of Brassica rapa
Beom-Seok Park,임기병,Hans de Jong,Tae-Jin Yang,Jee-Young Park,Soo-Jin Kwon,Jung Sun Kim,Myung-Ho Lim,Jin A Kim,Mina Jin,Yong-Moon Jin,Seog Hyung Kim,임용표,방재욱,Ho-Il Kim 한국분자세포생물학회 2005 Molecules and cells Vol.19 No.3
We describe the morphology and molecular organization of heterochromatin domains in the interphase nuclei, and mitotic and eiotic chromosomes, of Brassica rapa, using DAPI staining and fluorescence in situhybridization (FISH) of rDNA and ericentromere tandem repeats. We have developed a simple method to distinguish the centromeric regions of mitotic metaphase chromosomes by prolonged irradiation with UV light at the DAPI excitation wavelength. Application of this bleached DAPI band (BDB) karyotyping method to the 45S and 5S rDNAs and 176 bp centromere satellite repeats distinguished the 10 B. rapa chromosomes. We further characterized the centromeric repeat sequences in BAC end sequences. These fell into two classes, CentBr1 and CentBr2, occupying the centromeres of eight and two chromosomes, respectively. The centromere satellites encompassed about 30% of the total chromosomes, particularly in the core centromere blocks of all the chromosomes. Interestingly, centromere length was inversely correlated with chromosome length. The morphology and molecular organization of heterochromatin domains in interphase nuclei, and in mitotic and meiotic chromosomes, were further characterized by DAPI staining and FISH of rDNA and CentBr. The DAPI fluorescence of interphase nuclei revealed ten to twenty conspicuous chromocenters, each composed of the heterochromatin of up to four chromosomes and/or nucleolar organizing regions.