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Articles by N. Kojima
Total Records ( 2 ) for N. Kojima
  Y. Fujii , S.M.A. Kawsar , R. Matsumoto , H. Yasumitsu , N. Kojima and Y. Ozeki
  To find novel carbohydrate-binding proteins (lectins) from marine invertebrates to understand the binding mechanism of the protein and to apply it for glycan-dependent diagnostics and/or glycoconjugates capture technology. A D-galactoside-binding lectin was purified from foot of bladder moon shell, Glossaulax didyma by lactosyl-agarose affinity chromatography. The crude supernatant by Tris-buffered saline had strong hemagglutination activity against trypsinized and glutaraldehyde-fixed human erythrocyte. However, the activity was not inhibited by any tested saccharides and chilete reagents. On the other hand, the dialyzed crude supernatant obtained from the precipitates with 100 mM lactose in Tris-buffered saline had also hemagglutination activity inhibited by β-galactoside and D-galactose. The lectin was purified with lactosyl-agarose affinity chromatography. The molecular mass of the lectin was determined to be 60 kDa by SDS-PAGE under reducing and non-reducing conditions and being a 60 kDa polypeptide monomer by gel permeation chromatography. The association-rate constant (kass) and dissociation-rate constant (kdiss) determined for the lectin against asialofetuin was determined as 5.4x104 M-1sec-1 and 7.2x10-3sec-1, respectively. Lectin-conjugated Sepharose gel captured asialofetuin and eluted it by lactose-containing buffer from the gel, indicating that the lectin could catch the asialoglycoprotein. It was concluded that a many amount of a D-galactoside-binding lectin which can catch asialoglycoprotein presents in foot of the bladder moon shell.
Flow modulation effect on N incorporation into GaAs(1-x)Nx films during chemical beam epitaxy growth
  H. Suzuki , K. Nishimura , K. Saito , Y. Ohshita , N. Kojima and M. Yamaguchi

The change in the surface concentration of N ([N]s) on a GaAs surface under N and As source injections is investigated using the N atomic layer doping (N-ALD) technique, and the key factor determining [N]s is discussed. The As and N precursors source gases are trisdimethylaminoarsenic (TDMAAs, [N(CH3)2]3As) and monomethylhydrazine (MMHy, N2H3CH3), respectively. N-ALD layers are prepared by using two gas injection sequences (A: MMHy injection and B: MMHy and TDMAAs injections). [N]s increases with decreasing growth temperature in both sequences. [N]s in sequence A is higher than that of sequence B. In sequence B, Δ[N]st is proportional to exp(–tN), where t and τN are the gas injection time and the residence time of N, respectively. It is observed that the number of vacant sites, [V]s,N, remaining constant during gas injections. In sequence A, Δ[N]st cannot be fitted by a single exponential function, indicating that [V]s,N is not constant. From these results, we suggest that the vacant sites at the surface are created not only by N desorption but also by As desorption. It has been found that As desorption is enhanced by MMHy injection. As desorption reaction has been confirmed by in situ auger electron spectroscopy measurements. These results indicate that [N]s is determined by the competitive absorption between N and As, [V]s,N, and τN.

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