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Articles by K. Takayanagi
Total Records ( 3 ) for K. Takayanagi
  H Sawada , Y Tanishiro , N Ohashi , T Tomita , F Hosokawa , T Kaneyama , Y Kondo and K. Takayanagi

A spherical aberration-corrected electron microscope has been developed recently, which is equipped with a 300-kV cold field emission gun and an objective lens of a small chromatic aberration coefficient. A dumbbell image of 47 pm spacing, corresponding to a pair of atomic columns of germanium aligned along the [114] direction, is resolved in high-angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) with a 0.4-eV energy spread of the electron beam. The observed image was compared with a simulated image obtained by dynamical calculation.

  Y Oshima , H Sawada , F Hosokawa , E Okunishi , T Kaneyama , Y Kondo , S Niitaka , H Takagi , Y Tanishiro and K. Takayanagi

We visualized lithium atom columns in LiV2O4 crystals by combining scanning transmission electron microscopy with annular bright field (ABF) imaging using a spherical aberration-corrected electron microscope (R005) viewed from the [110] direction. The incident electron beam was coherent with a convergent angle of 30 mrad (semi-angle), and the detector collected scattered electrons over 20–30 mrad (semi-angle). The ABF image showed dark dots corresponding to lithium, vanadium and oxygen columns.

  Rabbani M.A. , A. Iwabuchi , Y. Murakami , T. Suzuki and K. Takayanagi
  In order to assess the potential of oilseed mustard in the breeding programs, 52 accessions were grown in the field and characterized for different morphological characteristics. The germplasm was collected from Punjab and N. W. F. Province of Pakistan in 1994 and evaluated for morpho-physiological traits under field conditions at Tsukuba. Japan during 1995 and 1996. Thirty-five phenotypic traits were recorded for all accessions from seedling emergence till crop harvest. A considerable level of genetic variation was observed among all tested accessions for various traits. However, most of the germplasm collections from Pakistan shared similar morphology with one another when compared with the leafy vegetable cultivars from Japan. Seedling characteristics showed less variation, while the largest variation was found for flowering and maturity stage characters. Generally, low correlation was observed among different traits, however, some of the related characters were significantly correlated with each other. The results indicated that oilseed mustard in Pakistan has narrow genetic base and experiencing high level of genetic erosion perhaps due to selection for similar traits, replacement by new uniform varieties and socio-economic changes in agriculture. Therefore, future germplasm collections should be focused to the unexplored, unique peripheral and more isolated areas of the country. Introduction of germplasm from abroad and hybridization in the available material will also be helpful to broaden the gene-pool of oilseed mustard in Pakistan.
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