Tatsuya Kamimura

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The purpose of this study was to investigate the effectiveness of 4-methylthiobenzoic acid (MTBA) as a protection agent against cisplatin (CDDP)-induced changes in organ of Corti surface structure, compared to electrophysiological changes. Electrophysiological change was assessed using auditory brainstem response (ABR) and morphological changes were(More)
BACKGROUND Transposition of the great arteries is one of the most commonly diagnosed conotruncal heart defects at birth, but its etiology is largely unknown. The anterior heart field (AHF) that resides in the anterior pharyngeal arches contributes to conotruncal development, during which heart progenitors that originated from the left and right AHF migrate(More)
This paper proposes an ultra-low-power 5.5-GHz PLL which employs a divide-by-4 injection-locked frequency divider (ILFD), which is calibrated by digital circuits, and linearity-compensated varactors for low supply-voltage operation. The proposed PLL was fabricated in 65nm CMOS. It shows a 1-MHz-offset phase noise of -106 dBc/Hz and the total power(More)
This paper proposes an ultra-low-power 5.5GHz PLL which employs a divide-by-4 injection-locked frequency divider (ILFD) and linearity-compensated varactor for low supply voltage operation. The digital calibration circuit is introduced to control the ILFD frequency automatically. The proposed varactor, which applies a forward-body-bias (FBB) technique, is(More)
This paper proposes a low-power and low phase-noise current-reuse quadrature VCO using a combination of capacitor coupling and transformer feedback technique. Compared with conventional active coupled QVCO, the proposed QVCO can achieve a low phase noise characteristics with low power consumption. The proposed QVCO was fabricated in 180 nm CMOS process(More)
After introducing potassium ion through the round window into the perilymphatic space of 40 guinea pigs by means of iontophoresis, physiological and histochemical investigations were performed to determine the role of the high perilymphatic potassium concentration in the vertiginous attack of Ménière's disease. About 15 min after the iontophoretic(More)
Sixty-five guinea pigs were used to investigate the influence of rotatostimulations on the lateral crista ampullaris. After repeated turning stimulations with the cupulometric mode (the terminal turning velocity: 180 degrees/sec) for 24-72 hours, the morphological changes in the crista ampullaris on the ampullopetal flow side were compared with those on the(More)