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PERIOD VARIATIONS OF SUPERHUMPS IN SU UMA STARS
IMADA, AKIRA,KATO, TAICHI The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We review recent results on superhump period variations in SU UMa-type dwarf novae. Our statistical studies have revealed that the evolution of the superhump period is basically composed of three stages: stage-A, during which the superhump period is long and constant, stage-B, during which the superhump period increases as the superoutburst proceeds, and stage-C, during which the superhump period is short and constant. We also introduce a new method of estimating a mass ratio using the stage-A superhump period. This method can extend to, for example, low mass X-ray binaries or AM CVn stars if the stage-A superhump period is well determined.
Chemical Approach for the Synthesis of Homogeneous Large Glycoproteins
Shohei Imada,Ryo Okamoto,Masayuki Izumi,Yasuhiro Kajihara 한국당과학회 2012 한국당과학회 학술대회 Vol.2012 No.1
Glycoprotiens are responsible in many biological events. However oligosaccharides covalently attached to these proteins always exhibit heterogeneity. This has been a hindrance to investigate what oligosaccharide structure is essential for the individual biological event. Therefore we have examined the chemical synthesis of several glycoproteins such as cytokines consist of 70 to 166 amino acid residues. [1-3] However, glycoproteins used in the cell-cell communication or immune response exhibit larger molecular weight comparing with those of cytokines we have synthesized. Unfortunately, the synthesis of such large and homogeneous glycoproteins is still far from our current achievements, because we have not established an efficient method for the synthesis of large glycoproteins yet. Native chemical ligation[4] is a powerful method to couple two polypeptide chains through a native amide bond. This ligation takes place between peptide-C-terminal thioester and cysteine at the N-terminal of another peptide. Using this ligation between glycopeptide-thioester synthesized by chemical method and long peptide prepared from E. coli expression, we have examined the synthesis of large glycoprotein. In this presentation, we would discuss the first synthesis of large and homogeneous glycosylpolypeptide chain (25 kDa) consists of over 200 amino acid residues.
Breed Discrimination Using DNA Markers Derived from AFLP in Japanese Beef Cattle
Sasazaki, S.,Imada, T.,Mutoh, H.,Yoshizawa, K.,Mannen, H. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.8
In the meat industry, correct breed information in food labeling is required to assure meat quality. Genetic markers provide corroborating evidence to identify breed. This paper describes the development of DNA markers to discriminate between Japanese Black and F1 (Japanese Black${\times}$Holstein) breeds. The amplified fragment length polymorphism method was employed to detect candidate markers absent in Japanese Black but present in Holstein. The 1,754 primer combinations yielded eleven markers that were converted into single nucleotide polymorphism markers for high-throughput genotyping. The allele frequencies in both breeds were investigated for discrimination ability using PCR-RFLP. The probability of identifying F1 was 0.9168 and probability of misjudgment was 0.0066 using four selected markers. The markers could be useful for discriminating between Japanese Black and F1 and would contribute to the prevention of falsified breed labeling of meat.