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Search Results: 1 - 10 of 5510 matches for " Yamamoto Satoshi "
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Enhanced Photo-Induced Property of LPCVD-TiO2 Layer on PCVD-TiOx Initial Layer  [PDF]
Satoshi Yamauchi, Keisuke Yamamoto, Sakura Hatakeyama
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.37004
Abstract: Plasma-assisted chemical vapor deposition (PCVD) was applied for amorphous TiOx deposition on Pyrex-glass substrate at low temperature below 90°C to control orientation of anatase-TiO2 layer by low pressure chemical vapor deposition (LPCVD) using TTIP-single precursor. Preferentially <112>-oriented anatase-TiO2 layer was successfully deposited with the orientation ratio as high as 68% on the initial layer of the thickness around 70 nm. Contact angle water was quickly decreased by UV-irradiation on the highly <112>-oriented TiO2 layer comparing with the layer directly deposited on glass, whereas surface roughness on the former was significantly reduced in comparison to that on the latter. Methyleneblue (MB) aqueous solution with the concentration of 2 mmol/L was used to evaluate photocatalytic property on the layer. Rate constant of MB-decomposition via first order kinetics increased with the orientation ratio above 60% was resulted in 2.3 × 10-1?min-1 for the layer with <112>-orientation ratio of 68%, whereas the constant was 2.8 × 10-3 min-1 for the layer directly deposited on glass.
Infected Iliac Artery Aneurysm Concomitant with Liver Abscess Caused by Fusobacterium nucleatum  [PDF]
Satoshi Yamamoto, Takafumi Akai, Takehiro Chiyoda, Hiroshi Goto, Yukiyoshi Masaki
Case Reports in Clinical Medicine (CRCM) , 2016, DOI: 10.4236/crcm.2016.57043
Abstract: We report a case of infected iliac artery aneurysm concomitant with liver abscesses caused by Fusobacterium nucleatum. A 58-year-old man developed an aneurysm of the right common iliac artery and liver abscesses. The aneurysm was resected and a femoro-femoral crossover bypass with a knitted Dacron graft was performed for impending rupture. Anaerobic cultures obtained from blood and intramural thrombus were positive for Fusobacterium nucleatum. With antibiotics, the liver abscesses disappeared without drainage. Iliopsoas abscesses developed after surgery, but it was controlled with antibiotics. The patient was free of infection 1 year after the surgery. The causative bacterium was suspected to originate in the oral cavity, because the patient had a notable history of poor chronic periodontal conditions. Clinically, infected aortoiliac aneurysm complicated by Fusobacterium is extremely rare relative to the prevalence of the pathogenic bacterium. However, it is noteworthy that Fusobacterium can cause this condition.
Millimeter-Wave Absorption Properties of Thin Wave Absorber in Free Space with New Porous Carbon Material  [PDF]
Toshihisa Kamei, Hiromi Shima, Takashi Yamamoto, Satoshi Ogino, Seishiro Ishii
Wireless Engineering and Technology (WET) , 2017, DOI: 10.4236/wet.2017.83004
Abstract: In this paper, we focus on PHYTOPOROUS, a porous carbon material made entirely from plant-based ingredients, as a new broadband-wave absorber material that acts in the millimeter wave band. We created prototypes of thin rubber-sheet wave absorbers that contain porous carbon (PHYTOPOROUS) made from rice chaff and soybean hulls, which are both agricultural residue products that are generated in large quantities. We investigated the permittivity and reflectance characteristics of this material using the free-space time-domain method. The thin rubber-sheet wave absorber that contained PHYTOPOROUS made from soybean hulls exhibited a frequency band that was approximately 18 GHz wide and centered at 90 GHz. The return loss for this material was greater than 20 dB. This demonstrates that the material provides nearly constant reflection absorption over a wide frequency band.
Nonvolatile Static Random Access Memory (NV-SRAM) Using Magnetic Tunnel Junctions with Current-Induced Magnetization Switching Architecture
Shuu'ichirou Yamamoto,Satoshi Sugahara
Physics , 2008, DOI: 10.1143/JJAP.48.043001
Abstract: We propose and computationally analyze a nonvolatile static random access memory (NV-SRAM) cell using magnetic tunnel junctions (MTJs) with magnetic-field-free current-induced magnetization switching (CIMS) architecture. A pair of MTJs connected to the storage nodes of a standard SRAM cell with CIMS architecture enables fully electrical store and restore operations for nonvolatile logic information. The proposed NV-SRAM is expected to be a key component of next-generation power-gating logic systems with extremely low static-power dissipation.
Effects of cola intake on fertility: a review  [PDF]
Atsushi Imai, Satoshi Ichigo, Hiroshi Takagi, Kazutoshi Matsunami, Noriko Suzuki, Akio Yamamoto
Health (Health) , 2010, DOI: 10.4236/health.2010.29147
Abstract: The consumption of soft drinks has increased considerably during the last decades. Among them, the cola-based preparations are possibly the refreshments with the largest sales worldwide. During the previous years, important concerns have been raised about the effects of colas on human health. In this review, we introduce the cola effects on reproduction including pregnancy miscarriages, ovulatory and menstrual disorders, and reduced semen quality. Although caffeine intoxication may be thought to play the most important role, a component of cola other than caffeine, or in combination with caffeine, may be associated with increased risk of reproductive hazards in heavy cola (> 1 L per day)-consumers. Cola discontinuation usually leads to an uneventful recovery in the most cases suggesting justification of limitations in the maximum recommended daily dose of these soft drinks. Cola is not an essential beverage, and abstaining from drinking more than 1 L per day is a minor intrusion in one’s personal life. Despite these uncertainties, this growing know- ledge may alarm the fertility risk of chronic cola intake in peoples of childbearing age.
Photo-Induced Reduction Reaction of Methylene Blue in an Ionic Liquid  [PDF]
Jun-ichi Kadokawa, Hironori Izawa, Tomoya Ohta, Satoshi Wakizono, Kazuya Yamamoto
International Journal of Organic Chemistry (IJOC) , 2011, DOI: 10.4236/ijoc.2011.14023
Abstract: Reduction of methylene blue (MB) occurred by photo irradiation at 280 - 370 nm wavelengths to a solution of MB in an ionic liquid, 1-butyl-3-methylimidazolium chloride (BMIMCl), which was confirmed by color change and UV-Vis measurement of the solution. Furthermore, the reduced MB was oxidized again by standing the solution under the conditions of light shielding at 50?C. The fluorescence spectra of the solution excited at 350 nm suggested that the photo-induced reduction probably took place via electron-transfer from BMIMCl to MB.
Results of aortic valve replacement for aortic stenosis in patients aged 80 years and older  [PDF]
Kenji Kuwaki, Atsushi Amano, Hirotaka Inaba, Taira Yamamoto, Shizuyuki Dohi, Takeshi Matsumura, Satoshi Matsushita
World Journal of Cardiovascular Diseases (WJCD) , 2012, DOI: 10.4236/wjcd.2012.23037
Abstract: Purpose: The aim of this study was to investigate our clinical experience in a contemporary series of aortic valve replacement (AVR) for aortic stenosis (AS) with or without coronary artery bypass grafting (CABG), and compare the early and mid-term results between patients aged more than 80 years and those aged less than 80 years. Methods: A retrospective review was performed of 258 consecutive patients with aortic stenosis (AS) who underwent AVR between August 2002 and December 2010 at Juntendo University Hospital. Results: Operative mortality was 7.3% in patients aged 80 years and older, compared with 3.6% in younger patients. Thus, operative mortality was higher in the older patients compared with the younger patients, but was not statistically significant between the two groups. Age more than 80 years was not a predictor of operative mortality. Advanced NYHA class (p = 0.03; odds ratio [OR], 9.5) was found to be a multivariate independent predictor of operative mortality. Patients aged 80 years and older were significantly more likely to suffer from respiratory failure after surgery than younger patients, but there were no significant differences in any other complications between the two age groups. Non-home discharge rate was significantly higher in the patients aged 80 years and older (21.9%) than in the younger patients (5.5%). Three-year survival was 84% in patients aged more than 80 years, and 83% of these elderly patients were living at home at the last follow-up. Conclusions: Patients aged 80 years and older have acceptable results of AVR with slightly increased risk of early mortality and morbidity compared with younger patients.
Advanced Spaceborne Thermal Emission and Reflection Radometer (ASTER) Enhanced Vegetation Index (EVI) Products from Global Earth Observation (GEO) Grid: An Assessment Using Moderate Resolution Imaging Spectroradiometer (MODIS) for Synergistic Applications
Hirokazu Yamamoto,Tomoaki Miura,Satoshi Tsuchida
Remote Sensing , 2012, DOI: 10.3390/rs4082277
Abstract: We assessed the compatibility of three Advanced Spaceborne Thermal Emission and Reflection Radometer (ASTER) based Enhanced Vegetation Index (EVI) products generated in the GEO Grid system to Moderate Resolution Imaging Spectroradiometer (MODIS) EVI. The three products were two forms of the two-band EVI with ASTER red and NIR bands but without a blue band and the original, three-band EVI computed with ASTER red and NIR, and MODIS blue reflectances. Our assessment results showed good compatibilities of all the three ASTER EVI products with MODIS EVI, suggesting potential for synergistic applications of multi-resolution EVI.
Use of an Ophthalmic Viscosurgical Device for Experimental Retinal Detachment in Rabbit Eyes
Akira Hirata,Soichiro Yamamoto,Satoshi Okinami
Journal of Functional Biomaterials , 2013, DOI: 10.3390/jfb4010006
Abstract: To investigate the temporary tamponade effects of an ophthalmic viscosurgical device (OVD) for experimental retinal tears, we performed vitrectomy in four rabbit eyes and created a posterior vitreous detachment and artificial retinal tear to produce retinal detachment. The retina was flattened with liquid perfluorocarbon (PFC), the area peripheral to the tear was photocoagulated, an OVD was applied to the retinal tear surface below the PFC and the PFC was removed by aspiration. In the control group, PFC was removed without application of OVD. At one, three and seven days postoperatively, funduscopy and optical coherence tomography (OCT) were performed to examine the sealing process of the retinal tear. In OVD-treated eyes, the OVD remained on the retinal surface, and the retinal tear was patched for ≥ 3 days postoperatively. By seven days postoperatively, the OVD on the retinal surface had disappeared, and the retina was reattached. In control eyes, the edge of the retinal tear was rolled, and retinal detachment persisted. In OVD-treated eyes, the border of the retinal tear was indistinct, and the defect area was significantly decreased. These results show that application of an OVD effectively seals retinal tears and eliminates retinal detachments.
In Vivo RNAi-Based Screens: Studies in Model Organisms
Miki Yamamoto-Hino,Satoshi Goto
Genes , 2013, DOI: 10.3390/genes4040646
Abstract: RNA interference (RNAi) is a technique widely used for gene silencing in organisms and cultured cells, and depends on sequence homology between double-stranded RNA (dsRNA) and target mRNA molecules. Numerous cell-based genome-wide screens have successfully identified novel genes involved in various biological processes, including signal transduction, cell viability/death, and cell morphology. However, cell-based screens cannot address cellular processes such as development, behavior, and immunity. Drosophila and Caenorhabditis elegans are two model organisms whose whole bodies and individual body parts have been subjected to RNAi-based genome-wide screening. Moreover, Drosophila RNAi allows the manipulation of gene function in a spatiotemporal manner when it is implemented using the Gal4/UAS system. Using this inducible RNAi technique, various large-scale screens have been performed in Drosophila, demonstrating that the method is straightforward and valuable. However, accumulated results reveal that the results of RNAi-based screens have relatively high levels of error, such as false positives and negatives. Here, we review in vivo RNAi screens in Drosophila and the methods that could be used to remove ambiguity from screening results.
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