Biomedical subjects
H Hoshikawa
Publications and source records attributed to H Hoshikawa.
Elastic properties of bacterial flagellar filaments. I. Free rotation case.
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[Gaze stabilization during stepping and running].
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Brownian motion of helical flagella.
We develops a theory of the Brownian motion of a rigid helical object such as bacterial flagella. The statistical properties of the random forces acting on the helical object are discussed and the coefficients of the correlations of the random forces are determined. The averages , and are also calculated where z and theta are the position along and angle around the helix axis respectively. Although the theory is limited to short time interval, direct comparison with experiment is possible by using the recently developed cinematography technique.
On the chemical reactions for chemotaxis in bacteria.
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[Prophylactic pacemaker implantation in a case of trifascicular block and His Bundle block: clinical use of His bundle electrogram].
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[Case of hyperostosis generalisata].
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Effect of labyrinthine dysfunction upon head oscillation and gaze during stepping and running.
Head oscillations and eye movements when stepping and running were studied in normal subjects and in patients with labyrinthine dysfunctions. In normal subjects, whereas linear head oscillations in the horizontal plane were very limited during both stepping and running, a marked increase in the vertical linear displacement induced pitching motions of the head during running. Patients with unilateral and bilateral lesions complaining of oscillopsia manifested lateral and diffuse oscillations, respectively, in the horizontal plane during stepping. The ratio of eye amplitude to head amplitude in the vertical plane showed larger values in subjects with labyrinthine lesions than in normals. The present results suggested that oscillopsia during upright locomotion is closely related to linear head oscillations with irregular and high-frequency components, in addition to dysfunction of the vestibulo-ocular reflex.