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Takanori Yamada,박규진,Junichi Node,Kakeru Ozaki,Manami Hiraiwa,Yuka Kitaguchi,Katsuyuki Kaneda,Shigeru Hiramoto,Eiichi Hinoi 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.4
An imbalance in the sophisticated regulationbetween bone-resorbing osteoclasts and bone-formingosteoblasts leads to the pathogenesis and etiology of certainmetabolic bone diseases including osteoporosis. Certainpolyamines are related to the pathophysiology of some disorders,including Alzheimer’s disease, infectious disease,cancer, and aging. Recently, we demonstrated that oralintake of polyamines (spermidine and spermine) preventedbone loss through preferential disturbance of osteoclasticactivation in ovariectomy-induced mouse model of postmenopausalosteoporosis. Here, we showed that daily oralsupplementation of a diet containing polyamine-rich Saccharomycescerevisiae S631 significantly inhibited osteoclasticactivation as well as reduction of bone volume in thecancellous bone without affecting uterine weight inovariectomized mice. Our findings recommend that dailyoral supplementation with polyamine-rich yeast diet wouldbe beneficial for prophylaxis of metabolic bone diseasesassociated with abnormal osteoclast activation.
Takegami Norihiko,Akeda Koji,Yamada Junichi,Imanishi Takao,Fujiwara Tatsuhiko,Kondo Tetsushi,Takegami Kenji,Sudo Akihiro 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.1
Study Design: Retrospective study.Purpose: This study aimed to evaluate the incidence, characteristics, and risk factors for clinical L5–S1 adjacent segment degeneration (ASD) after L5 floating lumbar fusion.Overview of Literature: ASD is known to occur after lumbar spine fusion at a certain frequency. Several studies on radiological L5– S1 ASD have been reported. However, there are only a few studies on L5–S1 ASD with clinical symptoms, including back pain and/or radiculopathy.Methods: In total, 306 patients who received L5 floating lumbar fusion were included in this study. Clinical L5–S1 ASD was defined as newly developed radiculopathy in relation to the L5–S1 segment. Patients’ medical records and imaging data were retrospectively analyzed. The risk factors for clinical ASD were assessed by an inverse probability of treatment weighting-adjusted logistic regression analysis.Results: Clinical L5–S1 ASD occurred in 17 patients (5.6%). The mean onset time of L5–S1 ASD was 12.9±7.5 months after the primary surgery. Among these patients, 10 (58.8%) presented with clinical L5–S1 ASD within 12 months. Reoperation was performed in three patients (1.0%). The severity of L5–S1 disk degeneration did not affect the occurrence of L5–S1 ASD. Logistic regression analysis showed that the number of fusion levels was a significant risk factor for clinical L5–S1 ASD.Conclusions: The incidence and characteristics of clinical L5–S1 ASD after L5 floating lumbar fusion were retrospectively investigated. This study established that the number of fusion levels was a significant candidate factor for clinical L5–S1 ASD. Careful clinical follow-up is deemed necessary after L5 floating lumbar fusion surgery, especially for patients who received multiple-level fusions.
STUDY ON X-RAYS AND NEUTRONS LEAKED FROM A 45 MeV ELECTRON LINAC FACILITY
Sawamura, Sadashi,Kitaichi, Masatoshi,Nojiri, Ichiro,Yamada, Takuma,Kaneko, Junichi,Sawamura, Teruko Korean Association for Radiation Protection 2001 방사선방어학회지 Vol.26 No.3
Spatial and time distributions of x-rays and neutrons from Hokkaido University 45 MeV electron linac facility were measured and compared with the calculation. In the calculation, x-rays in a Pb-target were evaluated using the EGS-code. The x-rays and the neutrons from the target to the facility building boundary and skyshine process outside the facility building were simulated with the EGS and the MCNP respectively.
STUDY ON X-RAYS AND NEUTRONS LEAKED FROM A 45 MeV ELECTRON LINAC FACILITY
Sadashi, Sawamura,Masatoshi, Kitaichi,Ichiro, Nojiri,Takuma Yamada,Junichi, Kaneko,Teruko, Sawamura 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.3
Spatial and time distributions of x-rays and neutrons from Hokkaido University 45 MeV electron linac facility were measured and compared with the calculation. In the calculation, x-rays in a Pb-target were evaluated using the EGS-code. The x-rays and the neutrons from the target to the facility building boundary and skyshine processs outside the facility building were simulated with the EGS and the MCNP respectively.
Koji Akeda,Kohshi Ohishi,Koichi Masuda,Won C. Bae,Norihiko Takegami,Junichi Yamada,Tomoki Nakamura,Toshihiko Sakakibara,Yuichi Kasai,Akihiro Sudo 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.3
Study Design: Preliminary clinical trial. Purpose: To determine the safety and initial efficacy of intradiscal injection of autologous platelet-rich plasma (PRP) releasate in patients with discogenic low back pain. Overview of Literature: PRP, which is comprised of autologous growth factors and cytokines, has been widely used in the clinical setting for tissue regeneration and repair. PRP has been shown in vitro and in vivo to potentially stimulate intervertebral disc matrix metabolism. Methods: Inclusion criteria for this study included chronic low back pain without leg pain for more than 3 months; one or more lumbar discs (L3/L4 to L5/S1) with evidence of degeneration, as indicated via magnetic resonance imaging (MRI); and at least one symptomatic disc, confirmed using standardized provocative discography. PRP releasate, isolated from clotted PRP, was injected into the center of the nucleus pulposus. Outcome measures included the use of a visual analog scale (VAS) and the Roland-Morris Disability Questionnaire (RDQ), as well as X-ray and MRI (T2-quantification). Results: Data were analyzed from 14 patients (8 men and 6 women; mean age, 33.8 years). The average follow-up period was 10 months. Following treatment, no patient experienced adverse events or significant narrowing of disc height. The mean pain scores before treatment (VAS, 7.5±1.3; RDQ, 12.6±4.1) were significantly decreased at one month, and this was generally sustained throughout the observation period (6 months after treatment: VAS, 3.2±2.4, RDQ; 3.6±4.5 and 12 months: VAS, 2.9±2.8; RDQ, 2.8±3.9; p <0.01, respectively). The mean T2 values did not significantly change after treatment. Conclusions: We demonstrated that intradiscal injection of autologous PRP releasate in patients with low back pain was safe, with no adverse events observed during follow-up. Future randomized controlled clinical studies should be performed to systematically evaluate the effects of this therapy.
( Shunsuke Gotoh ),( Tatsuya Kuboyama ),( Yasuo Moriyoshi ),( Koichi Hatamura ),( Junichi Takanashi ),( Toshio Yamada ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
The objective of this research is to extend the HCCI operational range by using direct fuel injection system and also our original blowdown supercharge (BDSC) system. The effect of in-cylinder fuel distribution on HCCI operational range was numerically and experimentally investigated. Firstly, a numerical simulation using a multi zone reaction model was carried out. The results showed that a uniform fuel distribution decreases the pressure rise rate (dP/dθ) with the thermal distribution generated by the BDSC system. Next, experiments were carried out using a gasoline engine equipped with the direct fuel injection and BDSC systems. The fuel injection timing, the fuel mass ratio between the direct injection and the port injection was varied as an experimental parameter to investigate the effect of the fuel distribution on the high load HCCI operational limits. The experimental results showed that the HCCI operational robustness at the high load operation was successfully improved by using the direct fuel injection. However, high load HCCI operational limit was hardly extended. Next, by using the endothermic effect of fuel, enhancement of thermal stratification was tested. However, the relationship between CA50 and dP/dθmax was not improved.