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Title: Visible-Light-Induced Aminochlorination of AlkenesAuthors: Mejri, Emna; Higashida, Kosuke; Kondo, Yuta; Nawachi, Anna; Morimoto, Hiroyuki; Ohshima, Takashi; Sawamura, Masaya; Shimizu, YoheiAbstract: Photoinduced N-internal vicinal aminochlorinationof styrene-type terminal alkenes was developed. The reaction proceededwithout any catalyst, and the use of N-chloro(fluorenoneimine) as both a photoactivatable aminating agent and a chlorinatingagent was essential. The imine moiety, introduced at the internalposition of the alkenes, could be hydrolyzed under mild conditionsto provide versatile beta-chlorinated primary amines, the syntheticutility of which was demonstrated by several transformations.

Title: Hydrogen Production from Hydrophobic Ruthenium Dye-Sensitized TiO2 Photocatalyst Assisted by Vesicle FormationAuthors: Higashida, Yusuke; Takizawa, Shin-ya; Yoshida, Masaki; Kato, Masako; Kobayashi, AtsushiAbstract: Dye-sensitizedH(2) evolution photocatalysts have attractedconsiderable attention as promising systems for the photochemicalgeneration of H-2 from water. In this study, to mimic thereaction field of natural photosynthesis artificially, we synthesizeda hydrophobic Ru-(II) dye-sensitized Pt-TiO2 nanoparticlephotocatalyst, RuC ( 9 )@Pt-TiO2 (RuC ( 9 ) = [Ru-(dC(9)bpy)(2)(H(4)dmpbpy)](2+); dC(9)bpy = 4,4 '-dinonyl-2,2 '-bipyridine, H(4)dmpbpy= 4,4 '-dimethyl phosphonic acid-2,2 '-bipyridine), andintegrated it into 1,2-dipalmitoyl-sn-glycero-3-phosphocholine(DPPC) lipid bilayer vesicle membranes. The photocatalytic H-2 production activity in 0.5 M l-ascorbic acid aqueous solutionenhanced by more than three times in the presence of DPPC vesicles(apparent quantum yield = 2.1 ...

Title: Changes in Litter Decomposition Across Succession in a Post-mined Peatland, Northern JapanAuthors: Takeuchi, Fumiko; Otaki, Michiru; Tsuyuzaki, ShiroAbstract: Litter decomposition along successional sere after peat mining was monitored for 3 years on post-mined peatland in Sarobetsu Mire, northern Japan. The litter of two dominant species (Rhynchospora alba and Moliniopsis japonica) was examined in 3 different successional habitats. We used the litterbag method to measure litter decomposition. We also measured changes in litter decomposition properties (carbon, nitrogen, and phospholipid fatty acids) with the environments (solar radiation and peat moisture). Bareground without litter showed the highest fluctuation of solar radiation and temperature, but the litter decomposition was slowest. Therefore, photodegradation and physical abrasion had affected weakly on litter decomposition. The concentrations of carbon, nitrogen, and phosphorus were not different between the two litter ...

Title: Synthesis of 2,3-Disubstituted Indoles by Nickel(0)-Catalyzed Migratory Cycloisomerization of o-AlkynylanilidesAuthors: Koshiba, Mikiko; Furuki, Yuto; Morisaki, Kazuhiro; Doi, Ryohei; Sato, YoshihiroAbstract: We herein report a nickel-catalyzed migratory cycloisomerization of o-alkynylanilides, giving 2,3-disubstituted indoles in good yields. The cyclization proceeded via acyl transfer on the nitrogen atom of the substrate to C3-position in the product, and an N-heterocyclic carbene (NHC) ligand such as ICy or SICy was found to be suitable in this reaction. It was thought that the reaction proceeds via an aza-nickelcyclepentene intermediate formed from alkyne and the C=O bond of the amide moiety in o-alkynylanilides.

Title: Dexamethasone dose-dependently prevents taxane-associated acute pain syndrome in breast cancer treatmentAuthors: Saito, Yoshitaka; Takekuma, Yoh; Takeshita, Takashi; Oshino, Tomohiro; Sugawara, MitsuruAbstract: PurposeTaxane-associated acute pain syndrome (T-APS) is one of the most bothersome adverse effects caused by taxanes. We have previously reported the attenuating effect of dexamethasone (DEX) on T-APS and its risk factors under DEX prophylaxis. However, the appropriate DEX dosage administration remains unclear. Therefore, this study aimed to investigate whether DEX dose-dependently prevents T-APS in breast cancer patients.MethodsWe retrospectively evaluated patients with breast cancer who received docetaxel (75 mg/m(2))-containing chemotherapy without pegfilgrastim and regular non-steroidal anti-inflammatory drugs. The patients were divided into 4 mg/day and 8 mg/day DEX groups, with each DEX dosage on days 2-4 (n = 68 for each group). Primary endpoint was the comparison ...

タイトル: Impact of the extremely warm Gulf Stream on heavy precipitation induced by Hurricane Sandy (2012) during its extratropical transition著者: Fujiwara, Keita; Kawamura, Ryuichi抄録: This study investigated the role of the extremely warm sea surface temperature (EWSST) over the Gulf Stream (GS) in heavy precipitation induced by Hurricane Sandy in October 2012 during its extratropical transition (ET). A control (CTL) run with observed SST and a climate (CLM) run with climatological SST over the GS were performed using a high-resolution regional atmospheric model. Sandy-induced precipitation over the Mid-Atlantic coastal region was larger by approximately 40% in the CTL run than in the CLM run during its ET phase. The western sector of Sandy in the CTL run exhibited the westward-tilting lower-to-middle tropospheric front and the pronounced convectively unstable layer created by large surface fluxes of sensible and latent heat from the EWSST region. The intensified convectiv ...

タイトル: Machine learning to predict major bleeding during anticoagulation for venous thromboembolism: possibilities and limitations著者: Mora, Damián; Mateo, Jorge; Nieto, José A.; Bikdeli, Behnood; Yamashita, Yugo; Barco, Stefano; Jimenez, David; Demelo-Rodriguez, Pablo; Rosa, Vladimir; Yoo, Hugo Hyung Bok; Sadeghipour, Parham; Monreal, Manuel抄録: Predictive tools for major bleeding (MB) using machine learning (ML) might be advantageous over traditional methods. We used data from the Registro Informatizado de Enfermedad TromboEmbólica (RIETE) to develop ML algorithms to identify patients with venous thromboembolism (VTE) at increased risk of MB during the first 3 months of anticoagulation. A total of 55 baseline variables were used as predictors. New data prospectively collected from the RIETE were used for further validation. The RIETE and VTE-BLEED scores were used for comparisons. External validation was performed with the COMMAND-VTE database. Learning was carried ...

タイトル: K-hive上のA型結晶構造に関するアルゴリズムとその実装著者: 成澤, 翔大; 白柳, 潔抄録: K-hives are combinatorial objects, which realize the crystal basis of an irreducible highest weight module over a quantized enveloping algebra of type A. In this paper, we provide a set of algorithms to compute the crystal structure on a set of K-hives. We also implemented these algorithms and created a Python package called khive-crystal. Then we give some examples of performing this package.

タイトル: 芸術と光技術の融合による感性ライティング著者: 桑田, 宗晴; 岡垣, 覚; 土佐, 尚子; 中津, 良平; 楠見, 孝抄録: We have developed a new type of lighting called “Kansei Lighting” that is distinct from existing lightingequipment by fusing art and optical technology. The combination of lighting system that produces parallel light and glass art objects made with a unique manufacturing method mimics nature and reproduces natural caustics. We also built a prototype and conducted a large-scale evaluation of the effects of this lighting on humans. This paper describes the concept, features, and psychological evaluation results of “Kansei Lighting”.記述: 「芸術分野に応用される光技術」特集号; Special Issue on Optical Technologies Applied in the Field of Art

2023年6月の特集「市制施行130周年」を掲載しました。