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Yagi Kiyoshi,Suzuki Nobuyuki,Mizutani Jun,Kato Kenji,Kondo Akira,Waseda Yuya,Goto Yuta,Murakami Hideki 대한척추외과학회 2022 Asian Spine Journal Vol.16 No.1
Study Design: A cadaveric study.Purpose: To investigate the anatomical features of segmental arteries and veins in the anterior part of the spinal column to prevent segmental vessel injury.Overview of Literature: The lateral transpsoas approach to the lumbar intervertebral discs (IVD) is associated with the risk of segmental vessel injury. Previous studies have described the vascular anatomy on the lateral part of the vertebral body. However, there are no studies that describe the segmental vessels on its anterior aspect. Here, we report the important anatomical features of the segmental arteries and veins that can intersect the anterior part of the IVD. These vessels are considered at risk of vascular injury when placing the anterior retractors during lateral lumbar interbody fusion or cutting the anterior longitudinal ligament during anterior column realignment.Methods: Five formalin-embalmed human cadavers were used. We assessed the proportion of segmental arteries and veins that intersected the IVD in the L2–L5 range and their course on the anterior part of the spinal column.Results: The segmental arteries and veins commonly intersect the anterior part of the IVD (artery, 28.1%; vein, 42.1%). Seven of 10 (70%) segmental arteries at L2 intersected the IVD, but only one artery intersected the IVD at L3 and L4. The proportions of segmental veins that intersected the IVD were 60%, 50%, and 16.7% at L2, L3, and L4, respectively.Conclusions: The segmental arteries and veins frequently intersect the IVD in the anterior part of the spinal column. Therefore, it is necessary to consider these individual anatomical features to prevent vascular damage during lateral lumbar interbody fusion surgery.
Practice of Design Curriculum Aimed for High Attainment Level of Creativity and Perfection
Yagi, Hidetsugu,Arimitsu, Yutaka Korean Society for Engineering Education 2010 공학교육연구 Vol.13 No.2
The practice named "Creative Design and Production" has been given to train the students'ability to find and solve problems. Students are expected to design and fabricate creative artifacts in the practice. The practices focusing on perfection and creativity of the products have been executed for the past few years. We have reviewed the relationships between these abilities and the qualities of products of the students in the practices. It seems that the products lacks of originality and creativity when focused on the perfection. And on the contrary, the perfection of the products is low when focused on the creativity. We have employed the new three trials in order to solve these problems in the practice. Among trials, the cooperation with veterans has been the most useful for students through "Creative Design and Production".
Improving Flow Distribution in a Suction Channel for a Highly Efficient Centrifugal Compressor
Yagi, Manabu,Shibata, Takanori,Kobayashi, Hiromi,Tanaka, Masanori,Nishida, Hideo Korean Society for Fluid machinery 2012 International journal of fluid machinery and syste Vol.5 No.3
Design parameters for suction channels of process centrifugal compressors were investigated, and an optimization method to enhance stage efficiency by using the new design parameters was proposed. From results of computational fluid dynamics, the passage sectional area ratios $A_c/A_e$, $A_e/A_s$ and $A_c/A_s$ were found to be the dominant parameters for the pressure loss and circumferential flow distortion, where $A_c$, $A_e$ and $A_s$ are passage sectional areas for the casing upstream side, casing entrance and impeller eye, respectively. The Base suction channel was optimized using the new design parameters, and the Base and Optimized types were tested. Test results showed that the Optimized suction channel achieved 3.8% higher stage efficiency than the Base suction channel while maintaining the same operating range.
Yagi Kiyoshi,Goto Yuta,Kato Kenji,Suzuki Nobuyuki,Kondo Akira,Waseda Yuya,Mizutani Jun,Kawaguchi Yohei,Joyo Yuji,Waguri-Nagaya Yuko,Murakami Hideki 대한척추외과학회 2021 Asian Spine Journal Vol.15 No.6
Study Design Human ligamentum flavum–derived cells (HFCs) were obtained from surgical samples for a basic experimental study. Purpose We sought to evaluate the inflammatory response of human ligamentum flavum cells to investigate hypertrophic changes occurring in the ligamentum flavum. Overview of Literature Lumbar spinal stenosis (LSS) is a disease commonly observed in the elderly. The number of patients with LSS has increased over time, yet the pathomechanisms of LSS still have not been fully elucidated. One of the clinical features of LSS is hypertrophy of the ligamentum flavum, which results in narrowing of the lumbar spinal canal. Some reports have suggested that ligamentum flavum hypertrophy is associated with inflammation and fibrosis; meanwhile, the p38 mitogen-activated protein (MAP) kinase is involved in the hypertrophy of human ligamentum flavum cells. Methods HFCs were obtained from patients with LSS who underwent surgery. HFCs were stimulated by tumor necrosis factor-α (TNF-α) and a p38 MAP kinase inhibitor, SB203580. Phosphorylation of the p38 MAP kinase was analyzed by western blotting. The concentration of interleukin-6 (IL-6) in the conditioned medium was measured by enzyme-linked immunoassay and IL-6 messenger RNA expression levels were determined by real-time polymerase chain reaction. Results TNF-α induced the phosphorylation of p38 MAP kinase in a time-dependent manner, which was suppressed by the p38 MAP kinase inhibitor, SB203580. TNF-α also stimulated IL-6 release in both a time- and dose-dependent manner. On its own, SB203580 did not stimulate IL-6 secretion from HFCs; however, it dramatically suppressed the degree of IL-6 release stimulated by TNF-α from HFCs. Conclusions This is the first report suggesting that TNF-α stimulates the gene expression and protein secretion of IL-6 via p38 MAP kinase in HFCs. A noted association between tissue hypertrophy and inflammation suggests that the p38 MAP kinase inflammatory pathway may be a therapeutic molecular target for LSS.
Molecular catalysts for water oxidation toward artificial photosynthesis
Yagi, Masayuki,Syouji, Akinori,Yamada, Satoshi,Komi, Manabu,Yamazaki, Hirosato,Tajima, Syouhei Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.2
Artificial photosynthesis is anticipated as one of the promising clean energy-providing systems for the future. The development of an efficient catalyst for water oxidation to evolve $O_2$ is a key task to yield a breakthrough for construction of artificial photosynthetic devices. Recently, significant progress has been reported in the development of the molecular catalysts for water oxidation based on manganese, ruthenium and iridium. The molecular aspects of the catalysts reported in the last decade were reviewed to provide hints to design an efficient catalyst, as well as to gain clues to reveal the mechanism of $O_2$ evolution at photosynthetic oxygen evolving complex in nature.
Yagi Sen,Furukawa Shinya,Shiraishi Kana,Miyake Teruki,Tange Kazuhiro,Hashimoto Yu,Kitahata Shogo,Kawamura Tomoe,Ninomiya Tomoyuki,Mori Kenichirou,Suzuki Seiyuu,Shibata Naozumi,Murakami Hidehiro,Ohashi 대한대장항문학회 2023 Annals of Coloproctolgy Vol.39 No.2
Purpose: The albumin-to-globulin ratio (AGR) is a recognized chronic inflammation marker. No evidence regarding the relationship between AGR level and ulcerative colitis (UC) exists. The aim of this study was to evaluate the association between AGR and clinical outcomes among Japanese subjects with UC. Methods: The study subjects consisted of 273 Japanese individuals with UC. AGR was divided into 4 categories (low, moderate, high, and very high). The definition of complete mucosal healing (MH) was based on the Mayo endoscopic subscore of 0. Clinical remission (CR) was defined as no rectal bleeding and no abnormally high stool frequency (<3 times per day). Results: The percentage of MH was 26.4%. High AGR and very high AGR were significantly positively correlated with CR (adjusted odds ratio [OR], 5.85; 95% confidence interval [CI], 2.52–14.18 and adjusted OR, 4.97; 95% CI, 2.14–12.04) and complete MH (adjusted OR, 4.03; 95% CI, 1.56–11.51 and adjusted OR, 5.22; 95% CI, 1.97–14.89), respectively after adjustment for confounding factors (P for trend=0.001). Only in the low C-reactive protein (CRP) group (≤0.1 mg/dL), very high AGR was significantly positively correlated with complete MH but not CR (adjusted OR, 4.38; 95% CI, 1.06–21.77; P for trend=0.017). In the high CRP group, no correlation between AGR and complete MH was found. Conclusion: Among Japanese patients with UC, AGR may be independently positively correlated with complete MH. In particular, among UC patients with low CRP, AGR might be a useful complementary marker for complete MH.