Masayuki Ikeda

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Intracellular free Ca(2+) regulates diverse cellular processes, including membrane potential, neurotransmitter release, and gene expression. To examine the cellular mechanisms underlying the generation of circadian rhythms, nucleus-targeted and untargeted cDNAs encoding a Ca(2+)-sensitive fluorescent protein (cameleon) were transfected into organotypic(More)
Perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) have recently received attention due to their widespread contamination in the environment, as well as in wildlife and humans. We measured the PFOS and PFOA concentrations in historically recorded human serum samples at an age range between 20 and 59 years collected in Kyoto, 20 persons per each(More)
The VPP500 vector parallel processor is a highly parallel, distributed memory supercomputer that has a performance range of 6.4 to 355 gigaFLOPS and a main memory capacity from 1 to 222 gigabytes. The system scalably supports between 4 and 222 processors interconnected by a high-bandwidth crossbar network.Three key aspects of the VPP500, which are in sharp(More)
OBJECTIVES The present study was initiated to examine the dietary intake, blood level and urinary concentration of lead (Pb) and cadmium (Cd) among children in Korea, in comparison with the findings in their mothers. METHODS Peripheral blood, spot urine and 24-h food duplicate samples were collected in Busan, Korea, from 38 pairs of children (4-10 years(More)
The objective of the present study is to examine whether rice is still a leading source of cadmium (Cd) burden among general populations in Japan. For this purpose, 10 prefectures were selected from all over Japan (including the northern- and southern-most Hokkaido and Okinawa prefecture, respectively). Cadmium levels in urine of never-smoking women(More)
Polybrominated diphenyl ethers (PBDEs) were measured in 2004 in 105 breast milk samples collected from 13 regions of Japan (Hokkaido, Akita, Miyagi, Tokyo, Gifu, Fukui, Kyoto, Hyogo, Wakayama, Shimane, Yamaguchi, Kochi and Okinawa). Six congeners (BDE-28, BDE-47, BDE-99, BDE-100, BDE-153 and BDE-154) were determined by gas chromatography /mass spectrometry(More)
Ohtsuji, H., and Ikeda, M. (1972). Brit. J. industr. Med., 29, 70-73. Quantitative relationship between atmospheric phenol vapour and phenol in the urine of workers in Bakelite factories. A survey in Bakelite factories revealed that the urinary level of total phenol, free plus conjugated, increased in proportion to the phenol concentration to which the(More)
CNS activity is generally coupled to the vigilance state, being primarily active during wakefulness and primarily inactive during deep sleep. During periods of high neuronal activity, a significant volume of oxygen is used to maintain neuronal membrane potentials, which subsequently produces cytotoxic reactive oxygen species (ROS). Glutathione, a major(More)
OBJECTIVE The purpose of this data compilation is to overview past and current dietary exposure (primarily via rice) of general populations to cadmium (Cd) in environmentally polluted and non-polluted areas in Japan, and to compare the levels with counterpart levels in other areas in Asia. METHODS A literature survey was conducted for publications on this(More)
This study was initiated to examine if the life away from home and participation in sport activities affect nutritional health among girl university students. For this purpose, anthropometric data, peripheral blood and spot urine samples, 24-hour food duplicate samples, and answers to questionnaires were collected from 71 girl students at 19 to 23 years of(More)