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  • 1995-1999  (4)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5711-5713 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The orientation of human red blood cells (RBCs) was controlled by the application of magnetic and electric fields. Because of their anisotropic diamagnetism, RBCs orient parallel to strong magnetic fields. The electric orientation of erythrocytes is also caused by electric dipoles induced by an electric field. The RBCs orientation is parallel to both the electric and magnetic fields. A 4–5 kV/m alternating current (ac) electric field (10–200 kHz, sine wave) was applied to RBCs suspended in a phosphate buffer solution using a pair of platinum black electrodes spaced 200–250 μm apart. An 8 T magnetic field was applied to the RBCs perpendicular to the direction of the electric field. It was observed that all RBCs were oriented in the same direction and parallel to the electric and magnetic fields. By the application of a horizontal 8 T magnetic field and a 4 kV/m ac electric field positioned perpendicular to one another, the RBCs oriented horizontally and their sedimentation rate was decreased by 18%. The flowing rate of the 10% RBCs suspension was decreased by 7.6% with the application of an 8 T magnetic field and a 4 kV/m ac electric field perpendicular to the direction of the suspension flow. It was observed that flowing RBCs were oriented perpendicular to the direction of the flow by the application of the fields, when the velocity of the suspension of RBCs was less than 300 μm/s. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4318-4320 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To clarify the effects of strong magnetic fields on biological membranes, changes in the capacitance of a black membrane, which is an artificially formed lipid bilayer membrane, were observed under strong magnetic fields up to 8 T. The effects of dc electric fields on a black membrane were also investigated. The membrane was suspended across a 0.8 mm diam hole in a teflon vessel immersed in a phosphate buffer solution. The capacitance of the membranes was increased through the application of magnetic fields perpendicular to the membranes. When a 4 T magnetic field was applied to the membrane, the capacitance change reached 96%. The capacitance of the membranes varied according to the size of the outer vessel in which the teflon vessel was placed. It is thought that the changes in the capacitance of the membrane were caused by the difference between the hydrostatic pressure on the outer and the inner sides of the teflon vessel. This difference in hydrostatic pressure was due to changes in the surface of the solution caused by the effect of a magnetic-field gradient on the solution. No effects except those due to mechanical deformation due to changes in hydrostatic pressure were observed on the lipid bilayer membrane from static magnetic fields up to 8 T. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1437-7772
    Keywords: Key words p53 ; Lymph node metastasis ; Colorectal cancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background. Lymph node metastasis has been recognized as the most reliable prognostic factor for colorectal cancer. Of late, the clinical significance of p53 as a prognostic factor has been reported. The purpose of the current study was to elucidate the significance of these two factors in combination as a prognostic indicator for colorectal cancer. Methods. One hundred forty-four patients with colorectal cancer were examined. The expression of p53 was determined by immunohistochemical staining. Patient data, lymph node metastasis, p53 expression, recurrence rate, 5-year survival, and disease-free survival were studied. Results. The recurrence rate for patients with p53− and n1 in combination was 21%, and that for patients with p53+ and n1 in combination was 63%, a significant difference. The 5-year survival rate for patients with p53− and n1 in combination was not significantly different from that for patients with p53+ and n1 in combination (78.7% vs. 57.5%); however, the 5-year disease-free survival rate for patients with p53− and n1 in combination was significantly better than that for patients with p53+ and n1 in combination (78.6% vs. 38.2%). Conclusion. The combination criterion of lymph node metastasis and p53 expression should be a useful prognosticator for colorectal cancer.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 171-174 (Oct. 1999), p. 709-716 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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