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DEVELOPMENT OF NEW TRIBO-MATERIALS "RB CERAMICS"MADE OF RICE BRAN
Hokkirigawa,Kazuo ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1999 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1999 No.-
In this investigation, the author would like to propose a new use of rice bran as carbonized materials "RB Ceramics". Making process of the RB ceramics is as follows; The defatted rice bran is mixed with phenol resin, formed into shape and dried, then carbonized at 300-1100℃ in nitrogen gas environment. During carbonizing process, rice bran changes to soft amorphous carbon and phenol resin changes to hard glassy carbon. The average Vickers hardness of the RB ceramics carbonized at 700-1100℃is 300-600kgf/mm², which is hardner than steel. RB ceramics contain pores, so their apparent density is very low(1.0-1.3g/cm³). Friction coefficient of RBceramics is low(0.13-0.17) without lubricant, and wear resistance is very high if Hertzian maximum contact pressure is lower than about 150MPa. Therefore, RB ceramics are expected to use as new friction materials, such as bearing, etc.
Nerophysiological Mechanisms of Acupuncture Analgesia
Kazuo Toda 경희대학교 동서의학연구소 1999 INTERNATIONAL SYMPOSIUM ON EAST-WEST MEDICINE Vol.1999 No.1
Kazuo Toda. Department of Physiology, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8549, Japan. Nerophysiological Mechanisms of Acupuncture Analgesia. Proceedings of International Symposium on East-West Medicine, Seoul. 27-35,1999.-Acupuncture stimulation evokes powerful analgesic feeects in various species of animals and in man. It is important to know which peripheral nerves convey the acupuncture information for producing analgesic effects. In addition, as one of the specific action of the acupuncture, it has been reported that maximunm effects are produced some time after the onset of the stimulation and the effects still remains after the cessation of its stimulation. Above-mentioned specific action, which is usually sustained for some minutes or even some days, may not be explained by simple inhibitory neural mechanisms. Therefore, it has been proposed that the acupuncture effects are elicited by the activation of the endogenous oioid system. However, a clear mechanism of analgesic effects induced by acupuncture is still nuknown. The present speech shows the summary of the recent studies about peripheral and central mechanisms of acupuncture-induced antinociceptive effects obtained mainly from rat experimets. The main topics are as follows: 1. Characteristics of meridian points 2. Afferentnerve information evoked by acupuncture stimulation 3. Inhibitory mechanisms in the CNS 4. Endogenous antinocicptive substances concerned with acupuncture analgesia 5. Descending antinociceptive effects
Conclusions and Suggestions on Low-Dose and Low-Dose Rate Radiation Risk Estimation Methodology
Sakai, Kazuo,Yamada, Yutaka,Yoshida, Kazuo,Yoshinaga, Shinji,Sato, Kaoru,Ogata, Hiromitsu,Iwasaki, Toshiyasu,Kudo, Shin'ichi,Asada, Yasuki,Kawaguchi, Isao,Haeno, Hiroshi,Sasaki, Michiya The Korean Association for Radiation Protection 2021 방사선방어학회지 Vol.46 No.1
Background: For radiological protection and control, the International Commission on Radiological Protection (ICRP) provides the nominal risk coefficients related to radiation exposure, which can be extrapolated using the excess relative risk and excess absolute risk obtained from the Life Span Study of atomic bomb survivors in Hiroshima and Nagasaki with the dose and dose-rate effectiveness factor (DDREF). Materials and Methods: Since it is impossible to directly estimate the radiation risk at doses less than approximately 100 mSv only from epidemiological knowledge and data, support from radiation biology is absolutely imperative, and thus, several national and international bodies have advocated the importance of bridging knowledge between biology and epidemiology. Because of the accident at the Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi Nuclear Power Station in 2011, the exposure of the public to radiation has become a major concern and it was considered that the estimation of radiation risk should be more realistic to cope with the prevailing radiation exposure situation. Results and Discussion: To discuss the issues from wide aspects related to radiological protection, and to realize bridging knowledge between biology and epidemiology, we have established a research group to develop low-dose and low-dose-rate radiation risk estimation methodology, with the permission of the Japan Health Physics Society. Conclusion: The aim of the research group was to clarify the current situation and issues related to the risk estimation of low-dose and low-dose-rate radiation exposure from the viewpoints of different research fields, such as epidemiology, biology, modeling, and dosimetry, to identify a future strategy and roadmap to elucidate a more realistic estimation of risk against low-dose and low-dose-rate radiation exposure.
Kazuo Yamazaki,Koh-ichi Takakura 한국응용곤충학회 2011 Journal of Asia-Pacific Entomology Vol.14 No.2
Plants defend themselves using various physical structures, including spines and thorns. However, some herbivorous insects can make use of defensive structures as food sources. A tortricid moth larva in the genus Cydia bores into thorns of the endangered Japanese honey locust Gleditsia japonica. The larva may escape predation by using the thorns as protection. A survey of sharp plant structures was proposed.
Recent Breakthroughs in Postharvest Physiology Research and Cut Flower Handling in Japan
Kazuo Ichimura,Tetsuya Yamada,Hiroko Shimizu-Yumoto 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.6
Senescence of flower petals has been reported to be controlled by genetically programmed cell death (PCD). Based on nuclear morphology and DNA degradation, which are parameters of PCD, we can categorize petal senescence for six plants into three types. In all plants, except for Prunus yedoensis, marked DNA degradation was observed during petal senescence. In morning glory, petunia and Argyranthemum frutescens, nuclear fragmentation occurred during PCD. In contrast, chromatin fragmentation in the nuclei was observed in carnation and snapdragon flowers. However, nuclear or chromatin fragmentation was not observed in P. yedoensis. In carnation flowers, PCD associated with petal senescence was shown to be highly regulated by ethylene. Wet transport is better than dry transport for maintaining the freshness of cut flowers, but the vase life of cut flowers is not markedly longer for wet transport than dry transport. Treatment with sucrose plus antimicrobial compounds before shipping and during wet transport extended vase life of rose flowers. This treatment was shown to be effective in extending vase life in practice for the transport of cut roses from Hokkaido and Chiba Prefecture to markets in Tokyo. Pulse treatment with silver thiosulfate complex (STS), an inhibitor of ethylene action, in combination with sucrose before shipping are followed by treatment with sucrose plus antimicrobial compounds during wet transport, extended the vase life of cut Eustoma, Delphinium and snapdragon flowers. This treatment was also confirmed to be effective in practice.