Tomoo Nagahama

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Japanese species, Aplysia kurodai, feeds well on Ulva but rejects Gelidium (Geli.) or Pachydictyon (Pach.) with different rhythmic patterned movements of the jaws and radula. During ingestion the jaws open at the radula-protraction phase and remain half open at the initial phase of the radula-retraction, whereas during rejection the jaws open similarly but(More)
1. We previously found that identified neuron C-PR may mediate the appetitive feeding posture of Aplysia by actions on appropriate motor neurons and perhaps on modulatory neurons innervating the foot and neck. In the present experiments, we attempted to further investigate this hypothesis by characterizing the modulatory neurons that are excited by CP-R. 2.(More)
1. Firing of cerebral neuron, C-PR, produced complex bilateral movements of various regions of the body of the marine mollusc Aplysia californica. The movements were similar to those seen when the animal assumes the head-up feeding posture during food-induced arousal. Muscles of the neck largely contracted in transverse and longitudinal directions, and(More)
Insertion of a thin nonmagnetic copper Cu(001) layer between the tunnel barrier and the ferromagnetic electrode of a magnetic tunnel junction is shown to result in the oscillation of the tunnel magnetoresistance as a function of the Cu layer thickness. The effect is interpreted in terms of the formation of spin-polarized resonant tunneling. The amplitude of(More)
and Ken'ichi Tatematsu for their useful discussions, comments, and advice. I also thank anonymous referee of the Astrophysical Journal for the recommendation on discussion on the eects of extinction. Also I thank all my friends and parents for helping and encouraging me in various aspects throughout this work. ABSTRACT Stars have been studied for a long(More)
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