Kazuaki Masuda

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The external muscle layer of the mammalian esophagus consists of striated muscles. We investigated the contractile properties of esophageal striated muscle by comparison with those of skeletal and cardiac muscles. Electrical field stimulation with single pulses evoked twitch-like contractile responses in esophageal muscle, similar to those in skeletal(More)
Marine yeasts were collected from coastal and deep sea areas in the Pacific Ocean and the Sea of Japan around central and northern Japan to prepare a novel type of natural seasoning. It was found that one of the marine yeasts collected from the Pacific Ocean off Hachinohe showed a high concentration of gamma-aminobutyric acid (GABA) in its extract, about(More)
Four marine yeasts isolated from the Pacific Ocean off Japan (Siki No. 4, Siki No. 15, Hach No. 6, and Inub No. 11), which showed high gamma-aminobutyric acid (GABA) producing abilities, were identified and classified by physiological and biochemical characteristics and gene sequence analyses. Analysis of biochemical data suggested that while Siki No. 15(More)
STUDY DESIGN This study focused on the effects that abdominal belts have on the sagittal section of the abdominal and pelvic cavity during contraction of the trunk muscles. Fast magnetic resonance imaging was used during the Valsalva maneuver by 11 healthy men. OBJECTIVE To evaluate the effect of an abdominal belt on the geometric changes in the sagittal(More)
INTRODUCTION Factors influencing clinical outcomes of osteosynthesis for elderly patients with Garden stage I and II femoral neck fractures are not well understood. MATERIALS AND METHODS To determine the factors influencing the clinical outcomes of in situ osteosynthesis in non-displaced femoral neck fractures in the elderly, radiographs and clinical data(More)
In near future, autonomous robots will be used in factories and offices. Since there are many stationary/moving obstacles in these environments, autonomous robots are require to make the path plans that can avoid moving objects such as people and robots. In this paper, we propose the path planning method to avoid the collisions with these obstacles. The(More)
The discretized maps of gradient models with Euler's method generate chaos, which can be used for global optimization by applying the chaotic annealing. In this paper, we apply this approach to solve the traveling salesman problem. We formulate it as continuous optimization problems with particular constraints, and newly derive gradient projection dynamics(More)
We report a displaced femoral shaft fracture that occurred with no sign of contact-induced, stress, fatigue, or previous abnormal bone pathology in a 19-y-old man who kicked the ground instead of the ball when playing soccer. After examination to rule out abnormal bone pathology, intramedullary nailing was performed. Bone union was achieved and he could(More)