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Katada, Naonobu,Nouno, Kazuma,Lee, Jun Kyu,Shin, Jiho,Hong, Suk Bong,Niwa, Miki American Chemical Society 2011 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.115 No.45
<P>Acidic properties of cage-based, small-pore aluminosilicate zeolites with CHA, AFX, RHO, LEV, ERI, and LTA topologies and their silicoaluminophosphate (SAPO) analogues were measured by means of an ammonia IRMS (infrared/mass spectroscopy)-TPD (temperature-programmed desorption) method. All SAPO molecular sieves studied here showed weaker Brønsted acid strength (11–26 kJ mol<SUP>–1</SUP> lower in the heat of ammonia desorption) than their aluminosilicate counterparts. The density functional theory (DFT) calculations of the ammonia desorption energy were in good agreement with experiments; the difference in the energy of ammonia desorption was less than 10 kJ mol<SUP>–1</SUP>. DFT also showed that the introduction of Al into the SiO<SUB>2</SUB> framework to form aluminosilicate zeolites resulted in large changes to the distance between atoms close to the acid site, while Si substitution into the AlPO<SUB>4</SUB> framework to form SAPO materials predominantly modified the angles between atoms relatively far from the acid site. The introduction of Al into SiO<SUB>2</SUB> frameworks causes higher compression of the Al–OH–Si bridge, inducing strongly acidic behavior, while the more flexible Al–O–P bond relaxed the compression in SAPO frameworks.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2011/jpccck.2011.115.issue-45/jp207894n/production/images/medium/jp-2011-07894n_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp207894n'>ACS Electronic Supporting Info</A></P>
K. Miki,Y. Oshita,D. Katada,K. Nobe,M. Nomura,T. Abe,H. Kasada,K. Ando,M. Adachi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
High sensitivity, stable ultraviolet photodiodes of a ZnSSe PIN junction structure on p+-GaAs substrates were developed by using molecular beam epitaxy (MBE). These short-wavelength photodiodes are fabricated on p-type (100) GaAs by utilizing an optimized \hetero-interface super-lattice (SL) buer" consisting of ZnTe-ZnSe multiple quantum well (MQW), overcoming a large energy barrier (>1 eV) for hole conduction in the GaAs-ZnSe hetero-interface. Another new important improved technique is to form an extremely thin, high-donor doping n+-window layer of 150 Å for incident ultraviolet light, by which we have established a high sensitivity of 0.11 A/W (ηex = 45 %: wavelength = 300 nm) with very low dark leakage currents (sub pA/mm2 at 20 V) at 300 K.
Kumagai, M.,Myung, S.T.,Katada, Y.,Yashiro, H. Pergamon Press 2016 ELECTROCHIMICA ACTA Vol.211 No.-
Type 310S stainless steel bipolar plate is investigated by means of single cell operated at several current densities for 500h. During the cell operations, the voltage decay is drastic at a lower current density (139mV at 0Acm<SUP>-2</SUP>), while the fluctuation is mitigated at a higher current density (21mV at 0.5Acm<SUP>-2</SUP>). The operation results are highly related to the surface conditions of bipolar plates, in particular, the cathode part. At the lower current density, the thickened layer mainly composed of iron oxide layers appears. Meanwhile, the outermost surface is enriched with thin chromium oxide layers when the higher current is applied. It is likely that the thick passive layer on the type 310S stainless steel increases the interfacial contact resistance between the gas diffusion layer and the bipolar plates of the cathode, thereby resulting in progressive voltage decay during the operation. Interestingly, general corrosion is not involved throughout the cell operation, confirming the superiority of type 310S stainless steel under the cell operation environment.
Yo Kubota,Satoshi Tanabe,Mizutomo Azuma,Kazue Horio,Yoshiki Fujiyama,Takafumi Soeno,Yasuaki Furue,Takuya Wada,Akinori Watanabe,Kenji Ishido,Chikatoshi Katada,Keishi Yamashita,Wasaburo Koizumi,Chika Ku 대한위암학회 2021 Journal of gastric cancer Vol.21 No.4
Purpose: Promoter DNA methylation of various genes has been associated with metachronous gastric cancer (MGC). The cancer-specific methylation gene, cysteine dioxygenase type 1 (CDO1), has been implicated in the occurrence of residual gastric cancer. We evaluated whether DNA methylation of CDO1 could be a predictive biomarker of MGC using specimens of MGC developing on scars after endoscopic submucosal dissection (ESD). Materials and Methods: CDO1 methylation values (TaqMeth values) were compared between 33 patients with early gastric cancer (EGC) with no confirmed metachronous lesions at >3 years after ESD (non-MGC: nMGC group) and 11 patients with MGC developing on scars after ESD (MGCSE groups: EGC at the first ESD [MGCSE-1 group], EGC at the second ESD for treating MGC developing on scars after ESD [MGCSE-2 group]). Each EGC specimen was measured at five locations (at tumor [T] and the 4-point tumor-adjacent noncancerous mucosa [TAM]). Results: In the nMGC group, the TaqMeth values for T were significantly higher than that for TAM (P=0.0006). In the MGCSE groups, TAM (MGCSE-1) exhibited significantly higher TaqMeth values than TAM (nMGC) (P<0.0001) and TAM (MGCSE-2) (P=0.0041), suggesting that TAM (MGCSE-1) exhibited CDO1 hypermethylation similar to T (P=0.3638). The area under the curve for discriminating the highest TaqMeth value of TAM (MGCSE-1) from that of TAM (nMGC) was 0.81, and using the cut-off value of 43.4, CDO1 hypermethylation effectively enriched the MGCSE groups (P<0.0001). Conclusions: CDO1 hypermethylation has been implicated in the occurrence of MGC, suggesting its potential as a promising MGC predictor.