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  • 1
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    Large entropy change derived from orbitally assisted three-centered two-electron $σ$ bond formation in metallic ${\mathrm{Li}}_{0.33}{\mathrm{VS}}_{2}$ (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-08-08
    Description: Author(s): N. Katayama, S. Tamura, T. Yamaguchi, K. Sugimoto, K. Iida, T. Matsukawa, A. Hoshikawa, T. Ishigaki, S. Kobayashi, Y. Ohta, and H. Sawa We discuss herein the emergence of a large entropy change in metallic Li 0.33 VS 2 derived from orbitally assisted loose σ bond formation. Comprehensive structural studies based on synchrotron x-ray and neutron diffraction analyses clarify the fabrication of ribbon chains at 375 K, consisting of multip... [Phys. Rev. B 98, 081104(R)] Published Tue Aug 07, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 2
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    Orthorhombic distortion and orbital order in the vanadium spinel FeV_{2} O_{4} (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-01-14
    Description: Author(s): S. Kawaguchi, H. Ishibashi, S. Nishihara, S. Mori, J. Campo, F. Porcher, O. Fabelo, K. Sugimoto, J. Kim, K. Kato, M. Takata, H. Nakao, and Y. Kubota Using synchrotron and neutron diffraction measurements, we find a low-temperature orthorhombic phase in vanadium spinel FeV 2 O 4 . The orbital order of V 3 + ions with tetragonal normal modes occurs at 68 K, and this leads to an appearance of the pseudotetragonal phase at a noncollinear ferrimagnetic tra… [Phys. Rev. B 93, 024108] Published Wed Jan 13, 2016
    Keywords: Structure, structural phase transitions, mechanical properties, defects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 3
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    Electronic phase transition in hollandite titanates Ba_{x} Ti_{8} O_{16+δ} (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-12-17
    Description: Author(s): R. Murata, T. Sato, T. Okuda, Y. Horibe, H. Tsukasaki, S. Mori, N. Yamaguchi, K. Sugimoto, S. Kawaguchi, M. Takata, and T. Katsufuji We studied the physical properties of hollandite titanates, Ba x Ti 8 O 16 + δ , which have double chains of edge-sharing TiO 6 octahedra with d electrons in the t 2 g states. We found that there is an electronic phase transition at ∼ 220 K, at which various properties exhibit anomalies. This phase transition i… [Phys. Rev. B 92, 220408(R)] Published Mon Dec 14, 2015
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 4
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    Magnetically driven ferroelectric atomic displacements in orthorhombic YMnO_{3} (2011)
    American Physical Society (APS)
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    Publication Date: 2011-08-12
    Description: Author(s): D. Okuyama, S. Ishiwata, Y. Takahashi, K. Yamauchi, S. Picozzi, K. Sugimoto, H. Sakai, M. Takata, R. Shimano, Y. Taguchi, T. Arima, and Y. Tokura Magnetically driven ferroelectric atomic displacements of the order of 10 −3 Å have been observed in orthorhombic (perovskite like) YMnO 3 by a single-crystal synchrotron x-ray diffraction. The refined polar structure shows the characteristic bond alternation driven by the exchange striction in stagge... [Phys. Rev. B 84, 054440] Published Thu Aug 11, 2011
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 5
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    Orbital structures in spinel vanadates AV_{2}O_{4} (A = Fe, Mn) (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-09-29
    Description: Author(s): Y. Nii, H. Sagayama, T. Arima, S. Aoyagi, R. Sakai, S. Maki, E. Nishibori, H. Sawa, K. Sugimoto, H. Ohsumi, and M. Takata Spinel FeV 2 O 4 exhibits successive structural phase transitions, reflecting the interplay between the Fe 2+ (3 d 6 ) and V 3+ (3 d 2 ) ions, both of which have orbital and spin degrees of freedom. The temperature-dependent orbital shapes of Fe 2+ and V 3+ were investigated by means of single-crystal structure ... [Phys. Rev. B 86, 125142] Published Fri Sep 28, 2012
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 6
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    Tetrahedral Magnetic Order and the Metal-Insulator Transition in the Pyrochlore Lattice of Cd_{2}Os_{2}O_{7} (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-06-14
    Description: Author(s): J. Yamaura, K. Ohgushi, H. Ohsumi, T. Hasegawa, I. Yamauchi, K. Sugimoto, S. Takeshita, A. Tokuda, M. Takata, M. Udagawa, M. Takigawa, H. Harima, T. Arima, and Z. Hiroi Cd 2 Os 2 O 7 shows a peculiar metal-insulator transition at 227 K with magnetic ordering in a frustrated pyrochlore lattice, but its magnetic structure in the ordered state and the transition origin are yet uncovered. We observed a commensurate magnetic peak by resonant x-ray scattering in a high-qualit... [Phys. Rev. Lett. 108, 247205] Published Wed Jun 13, 2012
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 7
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    Recruitment of Mec1 and Ddc1 checkpoint proteins to double-strand breaks through distinct mechanisms (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-10-27
    Description: In response to DNA damage, eukaryotic cells activate checkpoint pathways that arrest cell cycle progression and induce the expression of genes required for DNA repair. In budding yeast, the homothallic switching (HO) endonuclease creates a site-specific double-strand break at the mating type (MAT) locus. Continuous HO expression results in the phosphorylation of Rad53, which is dependent on products of the ataxia telangiectasia mutated-related MEC1 gene and other checkpoint genes, including DDC1, RAD9, and RAD24. Chromatin immunoprecipitation experiments revealed that the Ddc1 protein associates with a region near the MAT locus after HO expression. Ddc1 association required Rad24 but not Mec1 or Rad9. Mec1 also associated with a region near the cleavage site after HO expression, but this association is independent of Ddc1, Rad9, and Rad24. Thus, Mec1 and Ddc1 are recruited independently to sites of DNA damage, suggesting the existence of two separate mechanisms involved in recognition of DNA damage.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kondo, T -- Wakayama, T -- Naiki, T -- Matsumoto, K -- Sugimoto, K -- New York, N.Y. -- Science. 2001 Oct 26;294(5543):867-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biological Science, Graduate School of Science, Nagoya University, CREST, Japan Science and Technology Corporation, Chikusa-ku, Nagoya 464-0814, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11679674" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Cycle ; Cell Cycle Proteins/metabolism ; Cell Nucleus/metabolism ; Checkpoint Kinase 2 ; Cytoplasm/metabolism ; *DNA Damage ; DNA Repair ; DNA, Fungal/genetics/*metabolism ; DNA-Binding Proteins ; Deoxyribonucleases, Type II Site-Specific/metabolism ; Fungal Proteins/*metabolism ; Genes, Fungal ; Genes, Mating Type, Fungal ; Genes, cdc ; Intracellular Signaling Peptides and Proteins ; Mutation ; Nuclear Proteins ; Peptides/genetics ; Phosphorylation ; Protein-Serine-Threonine Kinases/metabolism ; Recombinant Fusion Proteins/metabolism ; Recombination, Genetic ; *Saccharomyces cerevisiae Proteins ; Saccharomycetales/cytology/genetics/*metabolism ; Transformation, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Modulation of microRNA processing by p53 (2009)
    Nature Publishing Group (NPG)
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    Publication Date: 2009-07-25
    Description: MicroRNAs (miRNAs) have emerged as key post-transcriptional regulators of gene expression, involved in diverse physiological and pathological processes. Although miRNAs can function as both tumour suppressors and oncogenes in tumour development, a widespread downregulation of miRNAs is commonly observed in human cancers and promotes cellular transformation and tumorigenesis. This indicates an inherent significance of small RNAs in tumour suppression. However, the connection between tumour suppressor networks and miRNA biogenesis machineries has not been investigated in depth. Here we show that a central tumour suppressor, p53, enhances the post-transcriptional maturation of several miRNAs with growth-suppressive function, including miR-16-1, miR-143 and miR-145, in response to DNA damage. In HCT116 cells and human diploid fibroblasts, p53 interacts with the Drosha processing complex through the association with DEAD-box RNA helicase p68 (also known as DDX5) and facilitates the processing of primary miRNAs to precursor miRNAs. We also found that transcriptionally inactive p53 mutants interfere with a functional assembly between Drosha complex and p68, leading to attenuation of miRNA processing activity. These findings suggest that transcription-independent modulation of miRNA biogenesis is intrinsically embedded in a tumour suppressive program governed by p53. Our study reveals a previously unrecognized function of p53 in miRNA processing, which may underlie key aspects of cancer biology.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Suzuki, Hiroshi I -- Yamagata, Kaoru -- Sugimoto, Koichi -- Iwamoto, Takashi -- Kato, Shigeaki -- Miyazono, Kohei -- England -- Nature. 2009 Jul 23;460(7254):529-33. doi: 10.1038/nature08199.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19626115" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line ; DNA Damage/physiology ; Gene Expression Regulation ; HCT116 Cells ; Humans ; MicroRNAs/*metabolism ; Mutation ; *RNA Processing, Post-Transcriptional ; Ribonuclease III/metabolism ; Tumor Suppressor Protein p53/genetics/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 9
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    Initiation by yeast RNA polymerase II at the adenoviral major late promoter in vitro (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-11-03
    Description: Transcription of the yeast CYC1 promoter fused to a sequence lacking guanosine residues provided a rapid, sensitive assay of initiation by RNA polymerase II in yeast extracts. Initiation was enhanced by yeast and mammalian activator proteins. The adenoviral major late promoter fused to the G-minus sequence was transcribed in yeast extracts with an efficiency comparable to that observed in HeLa extracts, showing that promoters as well as transcription factors are functionally interchangeable across species. Initiation occurred at different sites, approximately 30 and 63 to 69 base pairs downstream of the TATA element of the adenoviral promoter in HeLa and yeast extracts, respectively, distances characteristic of initiation in the two systems in vivo. A component of the transcription system and not the promoter sequence determines the distance to the initiation site.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lue, N F -- Flanagan, P M -- Sugimoto, K -- Kornberg, R D -- GM36659/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1989 Nov 3;246(4930):661-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Beckman Laboratories, Fairchild Center, Stanford School of Medicine, CA 94305.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2510298" target="_blank"〉PubMed〈/a〉
    Keywords: Adenoviruses, Human/*genetics ; Base Sequence ; GTP-Binding Proteins/genetics ; *Genes, Fungal ; HeLa Cells/metabolism ; Humans ; Molecular Sequence Data ; Oligonucleotide Probes ; *Promoter Regions, Genetic ; RNA Polymerase II/*metabolism ; Saccharomyces cerevisiae/enzymology/*genetics ; Templates, Genetic ; *Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Electronic nematicity above the structural and superconducting transition in BaFe2(As(1-x)P(x))2 (2012)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2012-06-23
    Description: Electronic nematicity, a unidirectional self-organized state that breaks the rotational symmetry of the underlying lattice, has been observed in the iron pnictide and copper oxide high-temperature superconductors. Whether nematicity plays an equally important role in these two systems is highly controversial. In iron pnictides, the nematicity has usually been associated with the tetragonal-to-orthorhombic structural transition at temperature T(s). Although recent experiments have provided hints of nematicity, they were performed either in the low-temperature orthorhombic phase or in the tetragonal phase under uniaxial strain, both of which break the 90 degrees rotational C(4) symmetry. Therefore, the question remains open whether the nematicity can exist above T(s) without an external driving force. Here we report magnetic torque measurements of the isovalent-doping system BaFe(2)(As(1-x)P(x))(2), showing that the nematicity develops well above T(s) and, moreover, persists to the non-magnetic superconducting regime, resulting in a phase diagram similar to the pseudogap phase diagram of the copper oxides. By combining these results with synchrotron X-ray measurements, we identify two distinct temperatures-one at T*, signifying a true nematic transition, and the other at T(s) (〈T*), which we show not to be a true phase transition, but rather what we refer to as a 'meta-nematic transition', in analogy to the well-known meta-magnetic transition in the theory of magnetism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kasahara, S -- Shi, H J -- Hashimoto, K -- Tonegawa, S -- Mizukami, Y -- Shibauchi, T -- Sugimoto, K -- Fukuda, T -- Terashima, T -- Nevidomskyy, Andriy H -- Matsuda, Y -- England -- Nature. 2012 Jun 20;486(7403):382-5. doi: 10.1038/nature11178.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Kyoto University, Kyoto 606-8502, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22722198" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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