Search results for: Takashi Otani

Items from 1 to 20 out of 42 results

article

Synthesis and Chiroptical Properties of Quinoxaline‐Fused Polyaza[5]–[7]helicenes with Orange‐Color CPL Emissions

Takashi Otani, Takuma Sasayama, Masashi Horiuchi, Shunnosuke Okauchi, more

Helvetica Chimica Acta > 104 > 4 > n/a - n/a

We achieved a two‐type synthesis of quinoxaline‐fused polyaza[5]‐ and [7]helicenes through consecutive N−H/C−H coupling with a hypervalent iodine reagent as a key reaction. By fusing electron‐deficient quinoxaline, these polyazahelicenes constitute an efficient donor‐acceptor type of molecule with absorption edges that reach up to approximately 650 nm. Evaluating the chiroptical properties reveals...

article

Listen to the outpatient: qualitative explanatory study on medical students’ recognition of outpatients’ narratives in combined ambulatory clerkship and peer role-play

Noriyuki Takahashi, Muneyoshi Aomatsu, Takuya Saiki, Takashi Otani, more

BMC Medical Education > 2018 > 18 > 1 > 1-14

Background Understanding patients’ narratives has been associated with methods of improving care that go beyond what may be regarded as a “narrow” view of scientific medicine. Medical interview training in which medical students develop understanding of the importance of patients’ narratives is receiving increased attention. However, students generally receive education on patients’ narratives that...

article

Facile Two‐Step Synthesis of 1,10‐Phenanthroline‐Derived Polyaza[7]helicenes with High Fluorescence and CPL Efficiency

Takashi Otani, Ami Tsuyuki, Taiki Iwachi, Satoshi Someya, more

Angewandte Chemie International Edition > 56 > 14 > 3906 - 3910

A facile two‐step synthesis of aza[7]helicenes possessing a 6‐5‐6‐6‐6‐5‐6 skeleton from commercially available 2,9‐dichloro‐1,10‐phenanthroline via double amination with aniline derivatives followed by hypervalent iodine reagent‐mediated intramolecular double‐NH/CH couplings was developed. Single‐crystal X‐ray analyses of the helicenes revealed unique structures, including both a significantly twisted...

article

Facile Two‐Step Synthesis of 1,10‐Phenanthroline‐Derived Polyaza[7]helicenes with High Fluorescence and CPL Efficiency

Takashi Otani, Ami Tsuyuki, Taiki Iwachi, Satoshi Someya, more

Angewandte Chemie > 129 > 14 > 3964 - 3968

article

Left ventricular noncompaction mimicking hypertrophic obstructive cardiomyopathy

Mareomi Hamada, Yoshimi Takamura, Takashi Otani, Kiyotaka Ohshima, more

International Journal of Cardiology > 2016 > 220 > C > 825-827

article

Potential application of immunoassays for simple, rapid and quantitative detections of phytoavailable neonicotinoid insecticides in cropland soils

Eiki Watanabe, Nobuyasu Seike, Yutaka Motoki, Keiya Inao, more

Ecotoxicology and Environmental Safety > 2016 > 132 > C > 288-294

This study evaluated the applicability of commercially available kit-based enzyme-linked immunosorbent assay (ELISA) to simple, quick, and quantitative detection for three water-extractable (phytoavailable) neonicotinoid insecticides: dinotefuran, clothianidin, and imidacloprid in soils. ELISA showed excellent analytical sensitivity for determination, but with cross-reaction to structurally related...

article

Morphological characterization of coronary arteries in immunoglobulin G4-related disease estimated by using computed tomography and magnetic resonance imaging

Takashi Otani, Yuji Matsumoto, Katsuji Inoue, Hiroaki Tanaka, more

International Journal of Cardiology > 2016 > 215 > C > 111-113

article

Biodegradation of γ-hexachlorocyclohexane by transgenic hairy root cultures of Cucurbita moschata that accumulate recombinant bacterial LinA

Yoshihiko Nanasato, Sayuri Namiki, Masao Oshima, Ryota Moriuchi, more

Plant Cell Reports > 2016 > 35 > 9 > 1963-1974

Key message γ-HCH was successfully degraded using LinA-expressed transgenic hairy root cultures of Cucurbita moschata . Fusing an endoplasmic reticulum-targeting signal peptide to LinA was essential for stable accumulation in the hairy roots. Abstract The pesticide γ-hexachlorocyclohexane (γ-HCH) is a persistent...

chapter

Gaze Estimation Using Human Joint Rotation Angel

Takashi Otani, Hironari Matsuda, Hideaki Touyama, Takayuki Nakata

2015 International Conference on Cyberworlds (CW) > 351 - 354

2015 International Conference on Cyberworlds (CW)

Currently, eye trackers can estimate with high precision using eye images. This method requires high-quality eye images, and thus cannot estimate using low-quality eye images, which have low resolution, illumination changes, and occlusions. Other methods use pose information, including head direction, body direction, and head motion. This method obtains pose information using the Eigenspace method,...

article

An inverse electron-demand diene-transmissive hetero-Diels–Alder reaction of N-sulfonyl-[3]-1-azadendralenes for stereocontrolled synthesis of polyhydroquinolines

Kan Kanai, Satoru Kobayashi, Kenji Kudo, Takuya Honjo, more

Tetrahedron Letters > 2015 > 56 > 36 > 5090-5093

Cross-conjugated 1-azatrienes ([3]-1-azadendralenes) bearing a sulfonyl group on the nitrogen atom were converted to various polyhydroquinolines with multiple stereocentres via a diene-transmissive hetero-Diels–Alder (DA) reaction consisting of an inverse electron-demand aza-DA reaction with electron-rich dienophiles followed by a stereoselective DA reaction with electron-deficient dienophiles.

article

[3]‐1‐Azadendralenes as Versatile Building Blocks for the Stereoselective Synthesis of Polysubstituted Hexahydroquinazolin‐2‐ones and Hexahydrobenzothiazine‐2‐imines

Satoru Kobayashi, Kenji Kudo, Ai Ito, Takuya Honjo, more

European Journal of Organic Chemistry > 2015 > 20 > 4367 - 4373

A diene‐transmissive hetero‐Diels–Alder reaction of cross‐conjugated 1‐azatrienes (3‐1‐azadendralenes) is described for the synthesis of hexahydroquinazolin‐2‐ones and hexahydrobenzothiazine‐2‐imines derivatives. [4+2] Cycloaddition reactions with tosyl isocyanate or aryl isothiocyanates gave mono‐cycloadducts with high chemo‐ and regioselectivities. The second Diels–Alder reaction with representative...

article

Differential uptake and translocation of β‐HCH and dieldrin by several plant species from hydroponic medium

Sayuri Namiki, Takashi Otani, Nobuyasu Seike, Shinobu Satoh

Environmental Toxicology and Chemistry > 34 > 3 > 536 - 544

To compare the uptake and translocation of hydrophobic organic chemicals by plant species, the authors performed uptake experiments with β‐1,2,3,4,5,6‐hexachlorocyclohexane (β‐HCH) and 1,2,3,4,10,10‐Hexachloro‐6,7‐epoxy‐1,4,4a,5,6,7,8,8a‐octahydro‐endo‐1,4‐exo‐5,8‐dimethanonaphthalene (dieldrin) using 5 species: Hordeum vulgare, Glycine max, Solanum lycopersicum, Brassica oleracea, and Cucurbita pepo...

article

Synthesis of macrocyclic heteroarylenes by consecutive inter- and intramolecular cycloadditions of thiophenylene-tethered triynes

Takanori Shibata, Masako Fujimoto, Takashi Otani

Tetrahedron > 2014 > 70 > 45 > 8453-8461

Consecutive inter- and intramolecular [2+2+2] cycloadditions of various thiophenylene-tethered triynes were comprehensively studied by using chiral Rh catalysts. When we started from 2,3- and 3,4-thiophenylene-tethered substrates, dimerization proceeded and chiral tetraheteroarylenes were obtained. In contrast, reactions of 2,5-thiophenylene-tethered substrates gave hexaheteroarylenes as trimers....

article

Identification and inheritance of a winter squash cultivar (Cucurbita maxima) with low heptachlor epoxide uptake ability

Keita Sugiyama, Daisuke Kami, Takato Muro, Tohru Ueno, more

Scientia Horticulturae > 2013 > 161 > Complete > 35-42

We aimed to find a cultivar with low Heptachlor exo-epoxide (HEPX) uptake ability among popular winter squash (Cucurbita maxima) cultivars and to reveal the heredity of cultivars with low HEPX uptake ability. The cultivar with low HEPX uptake ability ‘Hokkai 1’ was a pure-line, and the inheritance of low HEPX uptake ability could be investigated using this cultivar. Furthermore, we examined the suitability...

article

Palladium-Catalyzed Highly Regio- and Stereoselective Synthesis of 4-Alkylidene-4 H -3,1-benzoxazines from N -Acyl- o -alkynylanilines

Takao Saito, Shohei Ogawa, Naoya Takei, Noriki Kutsumura, more

Organic Letters > 2011 > 13 > 5 > 1098 - 1101

article

Dieldrin‐dissolving abilities of the xylem saps of several plant families, particularly Cucurbita pepo L.

Hirotatsu Murano, Takashi Otani, Nobuyasu Seike

Environmental Toxicology and Chemistry > 29 > 10 > 2269 - 2277

The uptake ability of hydrophobic organic chemicals by plants and the nature of xylem sap of the plants were studied. The plants were grown in soil contaminated with dieldrin. High amounts of dieldrin were detected in the shoots of Cucurbita pepo and Cucumis sativus, but little was seen in the shoots of Brassica oleracea var. italica, Solanum lycopersicum, Glycine max, Zea mays, and Helianthus annuus...

article

Synthesis of nitrogen heterocycle-fused 1,2,4-benzothiadiazine-1,1-dioxide, quinazolinone, and pyrrolidinone derivatives with a guanidine joint via sequential aza-Wittig reaction/intramolecular NH-addition cyclization/nucleophilic substitution ring closure methodology, using functionalyzed carbodiimides as key intermediates

Shinsuke Hirota, Terumi Sakai, Nobuhide Kitamura, Keisuke Kubokawa, more

Tetrahedron > 2010 > 66 > 3 > 653-662

We achieved efficient synthesis of imidazo- and pyrimido[1,2-b]benzo-1,2,4-thiadiazine-1,1-dioxides by the tandem aza-Wittig reaction/intramolecular NH-nucleophilic addition/NH-nucleophilic substitution cyclization methodology, involving sulfonamide ester-containing carbodiimides as the key intermediates. Similarly, imidazo[2,1-b]quinazolinones, imidazo[1,2-a]pyrimidinediones, and imidazo[1,2-a]imidazolidinediones...

article

Dieldrin uptake and translocation in plants growing in hydroponic medium

Hirotatsu Murano, Takashi Otani, Nobuyasu Seike, Mizuki Sakai

Environmental Toxicology and Chemistry > 29 > 1 > 142 - 148

It has been known that the Cucurbitaceae family takes up a large amount of persistent organic pollutants from soils and that the translocation of those compounds in cucurbits is higher than those in non‐cucurbits. To understand the persistent organic pollutant uptake mechanisms of plant species, we compared the dieldrin absorption and transportation potentials of several plants in hydroponic medium...

article

Relationship between Dieldrin Uptake in Cucumber and Solvent-Extractable Residue in Soil

Mizuki Sakai, Nobuyasu Seike, Hirotatsu Murano, Takashi Otani

Journal of Agricultural and Food Chemistry > 2009 > 57 > 23 > 11261 - 11266

article

Unexpectedly large aortoesophageal fistula inconsistent with CT imaging due to the thrombus working as the tamponade

Naoto Fukunaga, Takashi Matsueda, Masahiro Osumi, Atsushi Kurushima, more

Journal of Cardiology > 2009 > 54 > 3 > 466-469

A 69-year-old woman with a history of graft replacement of descending aortic aneurysm was referred to our hospital due to massive hematemesis with shock status. Additionally, the deterioration of respiratory status made us start the management under mechanical ventilation. The emergent gastrointestinal endoscopy by a general practitioner showed ulcer-like lesion of the upper esophagus and arterial...

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INFONA - science communication portal

Search results for: Takashi Otani

Synthesis and Chiroptical Properties of Quinoxaline‐Fused Polyaza[5]–[7]helicenes with Orange‐Color CPL Emissions

Listen to the outpatient: qualitative explanatory study on medical students’ recognition of outpatients’ narratives in combined ambulatory clerkship and peer role-play

Facile Two‐Step Synthesis of 1,10‐Phenanthroline‐Derived Polyaza[7]helicenes with High Fluorescence and CPL Efficiency

Facile Two‐Step Synthesis of 1,10‐Phenanthroline‐Derived Polyaza[7]helicenes with High Fluorescence and CPL Efficiency

Left ventricular noncompaction mimicking hypertrophic obstructive cardiomyopathy

Potential application of immunoassays for simple, rapid and quantitative detections of phytoavailable neonicotinoid insecticides in cropland soils

Morphological characterization of coronary arteries in immunoglobulin G4-related disease estimated by using computed tomography and magnetic resonance imaging

Biodegradation of γ-hexachlorocyclohexane by transgenic hairy root cultures of Cucurbita moschata that accumulate recombinant bacterial LinA

Gaze Estimation Using Human Joint Rotation Angel

An inverse electron-demand diene-transmissive hetero-Diels–Alder reaction of N-sulfonyl-[3]-1-azadendralenes for stereocontrolled synthesis of polyhydroquinolines

[3]‐1‐Azadendralenes as Versatile Building Blocks for the Stereoselective Synthesis of Polysubstituted Hexahydroquinazolin‐2‐ones and Hexahydrobenzothiazine‐2‐imines

Differential uptake and translocation of β‐HCH and dieldrin by several plant species from hydroponic medium

Synthesis of macrocyclic heteroarylenes by consecutive inter- and intramolecular cycloadditions of thiophenylene-tethered triynes

Identification and inheritance of a winter squash cultivar (Cucurbita maxima) with low heptachlor epoxide uptake ability

Palladium-Catalyzed Highly Regio- and Stereoselective Synthesis of 4-Alkylidene-4 H -3,1-benzoxazines from N -Acyl- o -alkynylanilines

Dieldrin‐dissolving abilities of the xylem saps of several plant families, particularly Cucurbita pepo L.

Dieldrin uptake and translocation in plants growing in hydroponic medium

Relationship between Dieldrin Uptake in Cucumber and Solvent-Extractable Residue in Soil

Unexpectedly large aortoesophageal fistula inconsistent with CT imaging due to the thrombus working as the tamponade

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