Tokyo University of Science

About: Tokyo University of Science is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Catalysis & Thin film. The organization has 15800 authors who have published 24147 publications receiving 438081 citations. The organization is also known as: Tōkyō Rika Daigaku & Science University of Tokyo.

Cosmic-ray electron-positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope

Abstract: We present a measurement of the cosmic-ray electron+positron spectrum between 7 GeV and 2 TeV performed with almost seven years of data collected with the Fermi Large Area Telescope. We find that the spectrum is well fit by a broken power law with a break energy at about 50 GeV. Above 50 GeV, the spectrum is well described by a single power law with a spectral index of 3.07 ± 0.02 (stat+syst) ± 0.04 (energy measurement). An exponential cutoff lower than 1.8 TeV is excluded at 95% CL. PACS numbers: 98.70.Sa, 96.50.sb, 95.85.Ry, 95.55.Vj

InBr3-promoted divergent approach to polysubstituted indoles and quinolines from 2-ethynylanilines: switch from an intramolecular cyclization to an intermolecular dimerization by a type of terminal substituent group.

Abstract: Use of a 2-ethynylaniline having an alkyl or aryl group on the terminal alkyne selectively produced a variety of polyfunctionalized indole derivatives in moderate to excellent yields via indium-catalyzed intramolecular cyclization of the corresponding alkynylaniline. In contrast, employment of a substrate with a trimethylsilyl group or with no substituent group on the terminal triple bond, exclusively afforded polysubstituted quinoline derivatives in good yields via indium-promoted intermolecular dimerization of the ethynylaniline. This indium catalytic system successfully accommodated the intramolecular cyclization of other arylalkyne skeletons involving a carboxylic acid and an amide group.

Highly efficient and stable red phosphorescent organic light-emitting diodes using platinum complexes.

Abstract: There have been many reports on phosphorescent organic light-emitting diodes (PHOLEDs) because of their relatively high emission effi ciencies compared with those of conventional fl uorescent OLEDs. [ 1–3 ] In addition to their effi ciency, the driving voltage and operational stability are important factors in the application of PHOLEDs to displays and lighting. PHOLEDs often have a charge-trapping problem at the sites of dopant molecules owing to the large band gap ( E g ) difference between the host and dopant molecules. [ 4 , 5 ] An increase in the driving voltage caused by doping a phosphorescent dye is often observed, particularly in red PHOLEDs using a conventional carbazole-based host material such as 4,4 ′ -bis(9-carbazolyl)2,2 ′ -biphenyl (CBP). When a dopant with a narrow E g is doped into a host with a wide E g , the difference in the highest occupied molecular orbital (HOMO) levels and/or lowest unoccupied molecular orbital (LUMO) levels between the dopant and the host signifi cantly increases. Subsequently, the dopant becomes a deep trap for hole and/or electron transport in the emitting layer. The maximum reported power effi ciency (PE) of red PHOLEDs was about 10 lm W − 1 in the early phase of their development, where the host/dopant combination was CBP/ Ir(piq) 3 (tris[1-phenylisoquinolinato-C2,N]iridium(III)). [ 6 ]

Classification and expression analysis of Arabidopsis F-box-containing protein genes.

Abstract: ;F-box proteins regulate diverse cellular processes, including cell cycle transition, transcriptional regulation and signal transduction, by playing roles in Skp1p-cullin-Fbox protein (SCF) complexes or non-SCF complexes. F-box proteins are encoded by a large gene family. Our database search revealed that at least 568 F-box protein genes are present in the Arabidopsis thaliana (Arabidopsis) genome. Domain search analysis using SMART and Pfam-A databases revealed that 67 of the F-box proteins contained Kelch repeats and 29 contained leucine-rich repeats (LRRs). Interestingly only two F-box proteins contained WD40 repeats that are found in many F-box proteins of other organisms. Kelch repeats, LRRs and WD40 repeats are implicated in protein–protein interactions. This analysis also resulted in the finding of several unique functional domains; however, 448 of the F-box proteins did not contain any known domains. Therefore, these proteins were used to search the Pfam-B database to find novel domains, and three putative ones were found. These domain search analyses led us to classify the Arabidopsis F-box proteins into at least 19 groups based on their domain structures. Macro array analysis showed that several F-box protein genes are expressed in a tissue-specific manner.