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Takayama, Yuichi,Kaneoka, Yuji,Maeda, Atsuyuki,Fukami, Yasuyuki,Takahashi, Takamasa,Uji, Masahito The Korean Gastric Cancer Association 2019 Journal of gastric cancer Vol.19 No.3
Purpose: The optimal method for intracorporeal esophagojejunostomy remains unclear because a purse-string suture for fixing the anvil into the esophagus is difficult to perform with a laparoscopic approach. Therefore, this study aimed to evaluate our novel technique to fix the anvil into the esophagus. Materials and Methods: This retrospective study included 202 patients who were treated at our institution with an intracorporeal circular esophagojejunostomy in a laparoscopy-assisted total gastrectomy with a Roux-en-Y reconstruction (166 cases) or a laparoscopy-assisted proximal gastrectomy with jejunal interposition (36 cases). After incising 3/4 of the esophageal wall, a hand-sewn purse-string suture was placed on the esophagus. Next, the anvil head of a circular stapler was introduced into the esophagus. Finally, the circular esophagojejunostomy was performed laparoscopically. The clinical characteristics and surgical outcomes were evaluated and compared with those of other methods. Results: The average operation time was 200.3 minutes. The average hand-sewn purse-string suturing time was 6.4 minutes. The overall incidence of postoperative complications (Clavien-Dindo classification grade ${\geq}II$) was 26%. The number of patients with an anastomotic leakage and stenosis at the esophagojejunostomy site were 4 (2.0%) and 12 (6.0%), respectively. All patients with stenosis were successfully treated by endoscopic balloon dilatation. There was no mortality. Regarding the materials and devices for anvil fixation, only 1 absorbable thread was needed. Conclusions: Our procedure for hand-sewn purse-string suturing with the double ligation method is simple and safe.
Takayama, Yuki,Taketa-Sato, Midori,Komori, Hirofumi,Morita, Kumiko,Kang, Su-Jin,Higuchi, Yoshiki,Akutsu, Hideo The Chemical Society of Japan 2011 Bulletin of the Chemical Society of Japan Vol.84 No.10
<P>Cytochrome <I>c</I><SUB>3</SUB> possesses four hemes in a compact configuration and exhibits extremely low reduction potentials. Besides the well-characterized factors contributing to the reduction potentials, the aromatic rings have been suggested to be involved. To elucidate its mechanism, the effect of mutations at conserved and noncoordinated aromatic residues on the reduction/oxidation properties of heme irons was investigated on the basis of crystal structures, NMR spectra of coordinated His, and reduction potentials. Phe20 parallel to heme 1 is the most conserved residue. On its mutation, the change in each coordination structure was subtle in the crystal structures despite of significant changes in the NMR spectra and reduction potentials. Significant increases in the reduction potentials of heme 1 led to the conclusion that the aromatic ring of Phe20 stabilizes the polarization of the π-electron density induced by the oxidized iron in the same heme. Furthermore, the reduction potential of heme 2 was also affected by the mutation at Phe20, revealing that the electrostatic interaction between the π-electron system of the porphyrin and a distant iron contributes to the iron reduction potential. This kind of interaction provides new insight into the role of the heme architecture in regulation of the reduction potentials.</P>
Takayama, Takuya,Shin, Sohyun,Kang, SoYoung,Kim, Suk Jin,Kim, Won Seog,Ko, Young Hyeh Elsevier 2018 Human pathology Vol.73 No.-
<P>The cellular lineage of extranodal NK/T-cell lymphoma, nasal-type (ENKTL), is determined by expression of T-cell receptor (TR) or TR gene rearrangement. In ENKTL, from TR immunohistochemistry, it may often be difficult to decide whether TR-positive cells are tumor cells or not, especially when TR is expressed in a subset of tumor cells. To analyze TR expression pattern and TR rearrangement in T lineage ENKTL, we performed double immunofluorescence staining for Epstein-Barr virus encoded small RNAs (EBER)/T-cell receptor (TCR) beta F1 and CD56/TCR beta F1 in 12 cases of ENKTL that showed TCR beta F1 expression in immunohistochemistry. TR gene rearrangement was analyzed using a commercial BIOMED-2 multiplex polymerase chain reaction system. Immunohistochemistry showed that all 12 cases expressed TCR beta F1 in a wide range of infiltrating cells from 100% to <1%. Two of them expressed both TCR beta F1 and TCR c gamma M1. EBER/TCR-beta F1 positivity was confirmed in 10 cases by double staining. One case failed to show EBER/TCR-beta F1 positive cells but showed a CD56/TCR beta F1 positive result. Among 12 cases, 5 had poor-quality DNA, 3 of them showed no polymerase chain reaction product, and 2 cases showed nonspecific peak of low height. Five of 7 cases with good DNA quality demonstrated monoclonal TR gene rearrangement. Based on TR expression and TR gene rearrangement, 10 of 12 cases of ENKTL were decided as a T-lineage tumor. In conclusion, because of common TR silence and poor DNA quality, consideration of both immunohistochemistry and TR gene rearrangement is necessary to determine the lineage of ENKTL. (C) 2017 Elsevier Inc. All rights reserved.</P>
Mechanical properties of bio-absorbable PLA/PGA fiber-reinforced composites
Tetsuo Takayama,Youhei Daigaku,Hiroshi Ito,Hideki Takamori 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
This study investigated important mechanical properties, the flexural strength and flexural modulus, of polyglycolic acid (PGA) fiberreinforcedpolylactic acid (PLA) composites fabricated by melt-mixing. The flexural strength and flexural modulus were estimated usingthree-point bending tests conducted at 37°C. Both the flexural strength and flexural modulus were increased by PGA fiber reinforcement. Viscoelastic properties were also investigated using dynamic mechanical analysis (DMA) under tensile loading. Results show that PGAfiber, which acts as the nucleate agent of PLA, restrains the molecular chains of PLA. That restraint reduces deformation at the samestress condition, thereby improving the PLA flexural properties.
Yoshiko Takayama,Takashi Tanaka,Koko Oikawa,Naoki Fukano,Mieko Goto,Takashi Takahashi 대한진단검사의학회 2018 Annals of Laboratory Medicine Vol.38 No.2
Guidelines recommend that clinical laboratories perform phenotypic tests (nitrocefin-based test and penicillin 10-U [P10] or 1-U [P1] zone edge tests) to detect penicillinase in Staphylococcus aureus isolates. This study aimed to assess the prevalence of blaZ encoding penicillinase and perform various phenotypic tests in S. aureus isolates from Japan. We prospectively collected 200 methicillin-susceptible S. aureus isolates from June 2015 to January 2016 and performed six phenotypic tests (nitrocefin-based test, P10 zone edge test/P10 diffusion test, penicillin 2-U [P2] zone edge test/P2 diffusion test, and cloverleaf test) on each sample.
Yuichi Takayama,Yuji Kaneoka,Atsuyuki Maeda,Yasuyuki Fukami,Takamasa Takahashi,Masahito Uji 대한위암학회 2019 Journal of gastric cancer Vol.19 No.3
Purpose: The optimal method for intracorporeal esophagojejunostomy remains unclearbecause a purse-string suture for fixing the anvil into the esophagus is difficult to performwith a laparoscopic approach. Therefore, this study aimed to evaluate our novel technique tofix the anvil into the esophagus. Materials and Methods: This retrospective study included 202 patients who were treatedat our institution with an intracorporeal circular esophagojejunostomy in a laparoscopyassistedtotal gastrectomy with a Roux-en-Y reconstruction (166 cases) or a laparoscopyassistedproximal gastrectomy with jejunal interposition (36 cases). After incising 3/4 ofthe esophageal wall, a hand-sewn purse-string suture was placed on the esophagus. Next,the anvil head of a circular stapler was introduced into the esophagus. Finally, the circularesophagojejunostomy was performed laparoscopically. The clinical characteristics andsurgical outcomes were evaluated and compared with those of other methods. Results: The average operation time was 200.3 minutes. The average hand-sewn pursestringsuturing time was 6.4 minutes. The overall incidence of postoperative complications(Clavien–Dindo classification grade ≥II) was 26%. The number of patients with ananastomotic leakage and stenosis at the esophagojejunostomy site were 4 (2.0%) and 12(6.0%), respectively. All patients with stenosis were successfully treated by endoscopicballoon dilatation. There was no mortality. Regarding the materials and devices for anvilfixation, only 1 absorbable thread was needed. Conclusions: Our procedure for hand-sewn purse-string suturing with the double ligationmethod is simple and safe.