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Magnetic properties of nanostructured wires deposited on the side edge of patterned thin film (2000)

Matsuyama, K. ; Komatsu, S. ; Nozaki, Y.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 87 (2000), S. 4724-4726

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: In the present study, magnetic nanowires with various cross-sectional dimensions have been fabricated by evaporating a magnetic material on the side edges of the patterned nonmagnetic thin film. The method allows the lengths of the two short axes to be defined precisely by controlling the thickness of the oxide (Wx) and magnetic material (Wy). The MFM images of the produced Co wires (2 μm length) with dimensions of Wx=Wy=200 nm and Wx=Wy=50 nm present the single domain configuration. The MFM and magnetoresistance (MR) measurement demonstrate that the longitudinal magnetization switching field increases with the decrease of Wx and Wy, which becomes 1.3 kOe for wires with Wx=Wy=50 nm. The profile of the MR hysteresis suggests that considerable coherent rotation takes place before the irreversible longitudinal switching. Transverse saturation fields larger than 6 kOe were measured in the orthogonal two short axis directions, which confirms the successful fabrication of three-dimensional wires with comparable cross-sectional dimensions. © 2000 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.373139

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Cold stress-induced calcium-dependent protein kinase(s) in rice (Oryza sativa L.) seedling stem tissues (2000)

Li, W. G. ; Komatsu, S.

Springer

Theoretical and applied genetics 101 (2000), S. 355-363

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ISSN: 1432-2242

Keywords: Key words Cold stress ; Ca2+-dependent protein kinase ; In-gel phosphorylation assay ; Rice

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Ca2+-dependent protein kinases (CDPKs) play an important role in plant signal transduction. Protein kinase(s) activities induced by 5°C cold stress in rice (Oryza sativa L.) seedlings were investigated in both leaf and stem tissues in an early (up to 45 min) and late (up to 12 h) response study. The leaf had 37-, 47- and 55-kDa protein kinase activities, and the stem had 37-, 47- and 55-kDa protein kinase activities. A 16-kDa protein showed constitutive kinase activity in the rice seedling leaf and stem. It was further identified that the 47-kDa protein kinase activity induced by cold in both the cytosolic and membrane fractions of the stem was strictly Ca2+-dependent. This CDPK activitiy increased in the presence of the Ca2+ ionophore A23187 in stem segments, whereas it was decreased by the Ca2+ channel blocker, LaCl3, and the Ca2+ chelator, EGTA. The general protein kinase inhibitor, staurosporine, completely inhibited this CDPK activity in vitro, and both W7, a calmodulin antagonist, and H7, a protein kinase C inhibitor, could only partially decrease this activity. The protein phosphatase inhibitor, okadaic acid, increased CDPK activity. This CDPK activity was also induced by salt, drought stress and the phytohormone abscicic acid. Among the 18 rice varieties tested, this cold-induced 47-kDa CDPK activity was stronger in the cold-tolerant varieties than in the sensitive ones.