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Takeshi Sasagawa,Hideki Murakami,Yoshinobu Maruhashi,Takeshi Segawa,Daiki Yamamoto,Shusuke Shimizu,Yasuhiko Morita,Takuya Nakamura 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.5
Vertebral fractures occur with only slight trauma in patients with diffuse idiopathic skeletal hyperostosis (DISH). However, a lumbar vertebra fracture, due to an intraoperative body position has not been previously reported. An 87-year-old woman with kyphosis sustained a left trochanteric fracture of her femur. The patient was placed in a supine position during the operation. Postoperatively, the patient experienced severe right thigh pain. Magnetic resonance imaging revealed an L4 vertebral fracture. Computed tomography revealed ankylosis from the upper thoracic spine to the sacrum. While in a supine position under general anesthesia, the contact of the patient’s lower back with operating table likely created a fulcrum at her lumbosacral spine acting as a long lever arm, bearing the mass of her upper body. We performed L1–S2 posterior stabilization. DISH patients with kyphosis placed in a supine position have an increased risk for lumbar vertebral fracture.
Performance Enhancement of TFI-OFDM with Path Selection based Channel Identification
Takeshi Yoshimura,Chang-Jun Ann,Takeshi Kamio,Hisato Fujisaka,Kazuhisa Haeiwa 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
Recently time-frequency interferometry (TFI)-OFDM has been proposed as a channel identification scheme. TFI-OFDM system can multiplex the same impulse response in twice on the time domain without overlapping to each other. In this case, the required pilot signal is only one. Moreover, by averaging of these impulse responses, the accurated channel impulse responses are obtained. However, if the total channel paths are reduced, the performance might be degraded. This is because the channel identification of TFI-OFDM is operated with averaging the selected spectrum signals from the time windows. For the case with reduced channel paths, the selected time spectrum signals include the noise terms. By applying the FFT operation, these noise terms are spread in the frequency domain. In this case, the channel identification is poorly operated due to the noise. To reduce this problem, in the paper, we propose the channel identification method with path selection for performance enhancement of TFI-OFDM.
Takeshi Kobayashi,Toshiaki Imanishi,Taizo Hanai,Ichiro Aoyagi,Jun Uemura,Katsuhiro Araki,Hiroshi Yoshimoto,Takeshi Harima,Hiroyuki Honda 한국생물공학회 2002 Biotechnology and Bioprocess Engineering Vol.7 No.5
In order to control glucose concentration during fed-batch culture for antibiotic production, we applied so called “software sensor” which estimates unmeasured variable of interest from measured process variables using software. All data for analysis were collected from industrial scale cultures in a pharmaceutical company. First, we constructed an estimation model for glucose feed rate to keep glucose concentration at target value. In actual fed-batch culture, glucose concentration was kept at relatively high and measured once a day, and the glucose feed rate until the next measurement time was determined by an expert worker based on the actual consumption rate. Fuzzy neural network (FNN) was applied to construct the estimation model. From the simulation results using this model, the average error for glucose concentration was 0.88 g/L. The FNN model was also applied for a special culture to keep glucose concentration at low level. Selecting the optimal input variables, it was possible to simulate the culture with a low glucose concentration from the data sets of relatively high glucose concentration. Next, a simulation model to estimate time course of glucose concentration during one day was constructed using the on-line measurable process variables, since glucose concentration was only measured off-line once a day. Here, the recursive fuzzy neural network (RFNN) was applied for the simulation model. As the result of the simulation, average error of RFNN model was 0.91 g/L and this model was found to be useful to supervise the fed-batch culture.
The Effect of L-Ornithine on the Phosphorylation of mTORC1 Downstream Targets in Rat Liver
Takeshi Kokubo,Shyuichi Maeda,Kyoko Tazumi,Hajime Nozawa,Yutaka Miura,Takayoshi Kirisako 한국식품영양과학회 2015 Preventive Nutrition and Food Science Vol.20 No.4
A non-protein amino acid, L-ornithine (Orn), has been shown to stimulate the urea cycle and tissue protein synthesis in the liver. The purpose of the current study was to assess whether Orn affects the mammalian target of rapamycin (mTOR) complex 1 (mTORC1) pathway, which is involved in protein synthesis. Primary cultured cells isolated from Wistar rat liver were incubated in an amino acid-free medium, followed by addition of Orn for 3 h. The cell lysate was subjected to immunoblotting to evaluate the phosphorylation of downstream targets of mTORC1, including p70S6K, S6, and 4EBP1. To assess the involvement of mTORC1 for the effect of Orn, the cells were pretreated with the mTOR inhibitor rapamycin before the addition of Orn and the cell lysate was subjected to immunoblotting. We next examined whether the effects of Orn were exerted in vivo. Orn was orally administered to 18 h food-deprived rats, the blood and the livers were collected at 1 and 3 h after administration for immunoblotting. Orn treatment for primary cultured cells for 3 h enhanced the phosphorylation of p70S6K, S6, and 4EBP1. In addition, rapamycin blocked the effects of Orn completely (p70S6K and S6) or partially (4EBP1). The oral administration of Orn to the rat also augmented the phosphorylation of mTORC1 downstream targets notably in S6 at 1 h. Our findings demonstrate that Orn has the potential to induce the phosphorylation of downstream targets of mTORC1 in the rat liver. This may be mediated by the augmentation of mTORC1 activity.
Growth inhibition and IRT1 induction of Arabidopsis thaliana in response to bismuth
Takeshi Nagata 한국식물학회 2015 Journal of Plant Biology Vol.58 No.5
Bismuth (Bi) is used in cosmetics and in semiconductor. And more, Bismuth is used in water pipes as substitute of lead. However, the Bi concentration in soil has not been investigated and no environmental quality standard is available in Japan. Here we investigated the effect of Bi on growth of Arabidopsis thaliana and identified the responsible genes with microarray analysis. The seeds, which were soaked with various concentrations of Bi including agar medium, were not able to germinate by more than 7 µM Bi. The root elongation and shoot growth were significantly inhibited by more than 2 µM Bi. Then, the mRNA was extracted from 2 µM Bi treated seedlings and the gene expression levels were analyzed by microarray. In response to Bi, 13 metal homeostasis genes were expressed 2-fold higher than that of control. The relative transcription level of AtIRT1, the primary Fe2+ uptake transporter in the root, was about 5-fold higher compared to the control. This data is indicating that Bi induces AtIRT1 expression in roots. Moreover, ferritin protein coding genes were one half lesser than that of the control. Bi exposure increased Fe accumulation in roots. These results suggest that Bi might disturb iron homeostasis in seedlings.