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Relation between interdiffusion and polarity for MBE growth of GaN epilayers on ZnO substrates
Takuma Suzuki,Chihiro Harada,Hiroki Goto,Tsutomu Minegishi,Agus Setiawan,고항주,Meoung-Whan Cho,T.Yao 한국물리학회 2004 Current Applied Physics Vol.4 No.6
We report on GaN growth on Zn-polar ZnO substrates using plasma-assisted molecular-beam epitaxy (P-MBE). Before GaNgrowth, ZnO substrate annealing conditions were optimized. Reection high-energy electron diraction (RHEED) patterns afterlow-temperature GaN buer layer annealing changed from streaky to spotty, suggesting that zinc and oxygen atoms interdiusefrom the ZnO substrate into the GaN epilayer. This interdiusion results in a mix-polar GaN epilayer.
CO-CULTURE OF BOVINE EMBRYOS WITH CUMULUS CELLS
Goto, K.,Koba, M.,Takuma, Y.,Nakanishi, Y.,Ogawa, K. Asian Australasian Association of Animal Productio 1989 Animal Bioscience Vol.2 No.4
Bovine embryos/ova obtained from in-vitro fertilization were either co-cultured on a monolayer of bovine cumulus cells or cultured in medium alone. Embryos/ova co-cultured with cumulus cells developed to 8-cell (30.9%), morula (29.8%) and blastocyst stages (26.6%) after 3-4, 5-6, and 7-8 days of culture, respectively, while embryos/ova cultured in medium alone failed to develop beyond 8-cell (0-13.3%), morula (0-1.5%) and blastocyst stages (0%). The results of this study demonstrated the beneficial effect of cumulus cells on the development of bovine embryos.
Hiroki Goto,Hisao Makino,Agus Setiawan,Takuma Suzuki,Chihiro Harada,Tsutomu Minegishi,Meoung-Whan Cho,Takafumi Yao 한국물리학회 2004 Current Applied Physics Vol.4 No.6
Optical properties of ZnO thin lms with/without MgO-buer annealing were investigated by low and room temperature photoluminescence measurements. The ZnO lms were grown onc-sapphire substrates by plasma-assisted molecular-beam epitaxy employing a thin MgO-buer layer. Dislocation density of ZnO layer was reduced from 5.3· 109 to 1.9· 109 cm. 2 by annealingMgO-buer prior to the growth of ZnO. The intensity of free exciton emission from the sample with MgO-buer annealing wasalmost twice of that from the sample without annealing, while the deep level emission from the sample with MgO-buer annealingwas about 1/3 of that without annealing. The MgO-buer annealing improves optical quality of overgrown ZnO lms.
Stress dependence on N/Ga ratio in GaN epitaxial films grownon ZnO substrates
Tsutomu Minegishi,Takuma Suzuki,Chihiro Harada,Hiroki Goto,Meoung-Whan Cho,Takafumi Yao 한국물리학회 2004 Current Applied Physics Vol.4 No.6
GaN films were grown on ZnO substrate under various beam equivalent pressure ratios by plasma-assisted molecular beamepitaxy (P-MBE). We theoretically calculated the thermal stress caused by the dierence of thermal expansion coecients betweenGaN and ZnO. The changes of stress and critical thickness were evaluated by measurement of XRD for HT GaN and LT GaNbuer grown under Ga-rich and N-rich conditions. From this study, we observed that GaN grown under Ga-rich condition causesGaN lm to under compressive-stress, while GaN grown under N-rich condition was tensile-stressed. Consequently, interdiusionhas no eect on the variation of the critical thickness.
Effectiveness of en-masse retraction using midpalatal miniscrews and a modified transpalatal arch
Jungkil Lee,Ken Miyazawa,Masako Tabuchi,Takuma Sato,Misuzu Kawaguchi,Shigemi Goto 대한치과교정학회 2014 대한치과교정학회지 Vol.44 No.2
Objective: The purpose of this study was to compare the treatment duration and dentoskeletal changes between two different anchorage systems used to treat maxillary dentoalveolar protrusion and to examine the effectiveness of en-masse retraction using two miniscrews placed in the midpalatal suture. Methods: Fifty-seven patients (9 men, 48 women), who had undergone level anchorage system treatment at Aichi-Gakuin University Dental Hospital (Nagoya, Japan) were divided into two groups according to the method of maxillary posterior anchorage reinforcement: midpalatal miniscrews (25 patients, mean age 22 years) and conventional anchorage (32 patients, mean age 19 years). The en-masse retraction period, overall treatment duration, pre-treatment effective ANB angle, and change in the effective ANB angle were compared with an independent-samples t -test. Results: Compared to the headgear group, the duration of en-masse retraction was longer by approximately 4 months in the miniscrew group (p < 0.001). However, we found no significant difference in the total treatment duration between the groups. Moreover, a greater change in the effective ANB angle was observed in patients treated with miniscrews than in those treated with the conventional method (p < 0.05). Conclusions: The level anchorage system treatment using miniscrews placed in the midpalatal area will allow orthodontists more time to control the anterior teeth during enmasse retraction, without increasing the total treatment duration. Furthermore, it achieves better dentoskeletal control than does the conventional anchorage method, thereby improving the quality of the treatment results.
( Masaki Kuwatani ),( Toru Nakamura ),( Tsuyoshi Hayashi ),( Yasutoshi Kimura ),( Michihiro Ono ),( Masayo Motoya ),( Koji Imai ),( Keisuke Yamakita ),( Takuma Goto ),( Kuniyuki Takahashi ),( Hiroyuki 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2020 Gut and Liver Vol.14 No.2
Neoadjuvant chemotherapy/neoadjuvant chemoradiotherapy (NAC/NACRT) can be performed in patients with pancreatic cancer to improve survival. We aimed to clarify the clinical outcomes of biliary drainage with a metal stent (MS) or a plastic stent (PS) during NAC/NACRT. Between October 2013 and April 2016, 96 patients with pancreatic cancer were registered for NAC/NACRT. Of these, 29 patients who underwent biliary drainage with MS or PS before NAC/NACRT and a subsequent pancreatoduodenectomy were retrospectively analyzed with regard to patient characteristics, preoperative recurrent biliary obstruction rate, NAC/NACRT delay or discontinuation rate, and operative characteristics. The median age of the patients was 67 years. NAC and NACRT were performed in 14 and 15 patients, respectively, and MS and PS were used in 17 and 12 patients, respectively. Recurrent biliary obstruction occurred in 6% and 83% of the patients in the MS and PS groups, respectively (p<0.001). NAC/NACRT delay was observed in 35% and 50% of the patients in the MS and PS groups, respectively (p=0.680). NAC/NACRT discontinuation was observed in 12% and 17% of the patients in the MS and PS groups, respectively (p=1.000). The operative time in the MS group tended to be longer than that in the PS group (625 minutes vs 497 minutes, p=0.051), and the operative blood loss volumes and postoperative adverse event rates were not different between the two groups. MS was better than PS from the viewpoint of preventing recurrent biliary obstruction, although MS was similar to PS with regards to perioperative outcomes. (Gut Liver 2020;14:269-273)