المؤلفون: Iwasaka, M.¹ iwasaka@faculty.chiba-u.jp, Ueno, S.²

المصدر: Journal of Applied Physics. 5/15/2005, Vol. 97 Issue 10, p10Q907-1-10Q907-3. 3p. 5 Diagrams.

مستخلص: We discovered that the motion of adherent cells was influenced by strong static magnetic fields and was parallel to the magnetic fields. A real-time observation of living cells in the presence of magnetic fields inside the bore of a superconducting magnet was performed by using a charge-coupled device camera with a monozoom lens. Fibroblastlike cells (MC3T3-E1) were cultured and observed by a video microscope system during magnetic-field exposures at 8 T. During the exposure, most cells showed a back-and-forth motion along the direction of the magnetic field. Specifically, the direction of cell extension immediately after cell division was parallel to the magnetic field. Cytoskeletons inside the cells were oriented in parallel with the magnetic fields, and introduced a cell motion parallel with the magnetic field. Our experiments showed that living cells consisting of diamagnetic materials had their motion restricted by the direction of the applied magnetic field. [ABSTRACT FROM AUTHOR]

المؤلفون: Iwasaka, M., Ueno, S.

المصدر: Journal of Applied Physics. 5/15/2003, Vol. 93 Issue 10, p6701. 3p. 1 Black and White Photograph, 1 Diagram, 3 Graphs.

مصطلحات موضوعية: *MAGNETIC fields, *OPTICAL polarization, *SMOOTH muscle, *MUSCLE cells

مستخلص: Strong static magnetic fields in the Tesla range have a diamagnetic force on cell components. Within an exposure period of 3 d, such magnetic fields generate a clear alignment of the smooth muscle cell assembly, which is parallel to the direction of the fields. In the present study, behavioral changes in intracellular components were suggested by changes in optical transmission under the influence of magnetic fields of 8 T. The magnetically oriented cells were exposed both in parallel and perpendicularly to the 8 T magnetic fields, and the time course of the polarized light transmission at 500 nm was measured in real time. The perpendicularly exposed cells had a presteady state, which was slow to increase. However, the total change in the intensity of the polarized light was larger than that of the cells exposed in parallel. We observed that no distinct changes in cell morphology including cell membrane components occurred during the 3 h of exposure to the magnetic fields. Based on the results, we concluded that intracellular component motion had a major influence on polarized light transmission under 8 T magnetic fields. We speculated that unconstrained intracellular macromolecules, such as actin fibers and microtubules, rotated due to diamagnetic torque forces during the 3 h of exposure to 8 T magnetic fields. [ABSTRACT FROM AUTHOR]

المؤلفون: Suda, T., Ueno, S.

المصدر: Journal of Applied Physics. 4/15/1999 Part 2B of 2, Vol. 85 Issue 8, p5711. 3p. 3 Diagrams, 1 Graph.

مصطلحات موضوعية: *PHYSIOLOGICAL effects of magnetic fields, *ERYTHROCYTES, *BLOOD flow

مستخلص: Presents information on a study which examined the effects of magnetic and electric orientations of human erythrocyte on blood flow. Methodology used; Results and discussion; Conclusions.

المؤلفون: Ueno, S., Iwaki, S., Tazume, K., Ara, K.

المصدر: Journal of Applied Physics. 4/15/1991, Vol. 69 Issue 8, p4925. 3p. 2 Diagrams, 2 Graphs.

مصطلحات موضوعية: *GAS flow, *MAGNETIC fields, *HEAT pipes

مستخلص: Presents a study which applied the phenomenon of gas flow blocked by magnetic fields to the control of heat transport in oxygen-packed heat pipes. Experimental method used; Description of the time course of temperature at seven points inside and outside of the heat pipe without magnetic field exposures; Overview of the blocking of heat transport by magnetic fields.

المؤلفون: Ueno, S., Hiwaki, O.

المصدر: Journal of Applied Physics. 4/15/1991, Vol. 69 Issue 8, p6019. 3p. 4 Diagrams, 2 Graphs.

مصطلحات موضوعية: *MAGNETIZATION, *SPINE

مستخلص: Presents a study that designed a noninvasive method of magnetic stimulation of the spinal roots. Idea behind the method; Magnetic stimulation of the spinal roots of a human and a rabbit; Selective stimulation of the spine level.

المؤلفون: Ueno, S., Matsuda, T., Hiwaki, O.

المصدر: Journal of Applied Physics. 5/1/1990, Vol. 67 Issue 9, p5838. 3p. 3 Diagrams, 1 Graph.

مصطلحات موضوعية: *NEURAL stimulation, *BRAIN, *SPINAL cord

مستخلص: Presents a study which proposed a method of localized stimulation of the human brain and spinal cord. Functional mapping of the human motor cortex related to the hand, arm and foot areas; Existence of an optimum direction of stimulating currents for neural excitation in each functional area of the cortex; Amplitude of the electromyographic signals.

المؤلفون: Ueno, S., Shiokawa, K., Iwamoto, M.

المصدر: Journal of Applied Physics. 5/1/1990, Vol. 67 Issue 9, p5841. 3p. 1 Black and White Photograph, 2 Diagrams.

مصطلحات موضوعية: *MAGNETIC fields, *BEHAVIORAL embryology, *MAGNETIC resonance

مستخلص: Studies the influence of intense magnetic fields on the embryonic development of frogs in reference to a potential hazardous problem in magnetic resonance imaging technology. Developmental processes of embryos during and after magnetic field exposures; Discussion on whether there is a difference in the cleavage pattern between the control and those exposed to magnetic field; Experimental setup to observe the embryonic development of frog embryos in a superconducting magnet.

المؤلفون: Iramina, K., Ueno, S.

المصدر: Journal of Applied Physics. 5/1/1990, Vol. 67 Issue 9, p5835. 3p. 6 Diagrams, 1 Graph.

مصطلحات موضوعية: *BRAIN magnetic fields measurement, *MAGNETOENCEPHALOGRAPHY, *ELECTROENCEPHALOGRAPHY

مستخلص: Focuses on the influence of inhomogeneities in the head upon surface magnetic fields. Effects of combinations of dipoles and an inhomogeneous region on spatial distributions of magnetoencephalograms (MEG); Magnetic field components perpendicular to the surface of the sphere; Spatial distributions of MEG and electroencephalograms.

المؤلفون: Ueno, S., Shimohata, K., Yamada, T., Iwamoto, M.

المصدر: Journal of Applied Physics. 5/1/1990, Vol. 67 Issue 9, p5904. 3p. 1 Diagram, 3 Graphs.

مصطلحات موضوعية: *GAS flow, *MAGNETIC fields, *PARTICLES

مستخلص: Provides information on a study which examined the phenomenon regarding the influence of a magnetic field on flow patterns of gases. Experimental procedure; Discussion of the magnetic curtain model to explain the phenomenon; Application of the phenomenon to magnetic separation of fine particle dust in air.

المؤلفون: Ueno, S., Iwasaka, M.

المصدر: Journal of Applied Physics. 5/1/1990, Vol. 67 Issue 9, p5901. 3p. 3 Diagrams, 6 Graphs.

مصطلحات موضوعية: *MAGNETIC fields, *GAS flow

مستخلص: Provides information on a study concerning the mechanism of magnetic curtain produced by magnetic fields. Observation on the flow of gas in oxygen and nitrogen atmosphere; Effect of magnetic curtains on gas flow; Observation on the components of magnetic curtains.