Atomic displacements and lattice distortion in the magnetic-field-induced charge ordered state of SmRu4_{4}P12_{12}

Structural properties of SmRu$_4$P$_{12}$ in the anomalous magnetic ordered phase between $T^*\sim 14$ K and $T_{\text{N}}=16.5$ K in magnetic fields has been studied by x-ray diffraction. Atomic displacements of Ru and P, reflecting the field-induced charge order of the $p$ electrons, have been deduced by analyzing the intensities of the forbidden Bragg peaks, assuming a cubic space group $Pm\bar{3}$. Also, by utilizing high-resolution x-ray diffraction experiment, we observed a splitting of fundamental Bragg peaks, clarifying that the unit cell in the magnetic ordered phase is rhombohedral elongated along the $[1\, 1\, 1]$ axis. Responses of the rhombohedral domains to the magnetic field, which reflects the direction of the magnetic moment, is studied in detail.Comment: 11 pages, 11 figures, accepted for publication in PR

Pronounced - Log T Divergence in Specific Heat of Nonmetallic CeOBiS2_2: A Mother Phase of BiS2_2-Based Superconductor

The low-temperature properties of CeOBiS$_2$ single crystals are studied by electrical resistivity, magnetization, and specific heat measurements. Ce 4f -electrons are found to be in a well-localized state split by crystalline-electric-field (CEF) effects. The CEF ground state is a pure $J_z$ = $\pm$ 1/2 doublet, and excited doublets are located far above. At low temperatures in zero field, we observe pronounced $-\log T$ divergence in the specific heat, revealing the presence of quantum critical fluctuations of 4f magnetic moments near a quantum critical point (QCP). Considering that CeOBiS$_2$ is a nonmetal, this phenomenon cannot be attributed to the competition between Kondo and the Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions as in numerous f-electron-based strongly correlated metals, indicating an unconventional mechanism. We suggest that CeOBiS$_2$ is the first material found to be located at a QCP among geometrically frustrated nonmetallic magnets.Comment: 12 pages, 5 figure

Sm金属間化合物における新奇な量子秩序相

首都大学東京, 2016-03-25, 博士（理学）, 甲第566号首都大学東

Structure of 2\u27-Deoxymugineic Acid, A Novel Amino Acid Possessing an Iron-Chelating Activity

A novel amino acid possessing an iron-chelating activity, 2\u27-deoxymugineic acid, has been isolated from root washings of water-cultured wheat (Triticum aestivum L.) under iron deficient media, and shown to have structure (1) by chemical and physicochemical studies

Decolonizing dioarchaeology in Sudan

Bioarchaeology, as a subdiscipline, has begun confronting its colonial origins and discussing how to incorporate stakeholders and ethically move forward. Here, we frame this discussion within the context of Sudan and Ancient Nubia. We argue that first we must acknowledge the sordid history of the discipline and then actively take steps to dismantle continuing systems of racism, sexism, and western-centered biases. We begin by discussing the history of the excavation, analysis, and treatment of human skeletal remains from early excavations through to current projects. We then turn to an examination of how we can further decolonize bioarchaeology in Sudan. This will certainly involve working closely with local communities and the National Corporation for Antiquities and Museums, as well as a reconsideration of decision-making processes. We are working towards a best care practices document, detailing guidelines for the curation and analysis of human skeletal remains.Bioarchaeolog

9a-Hy­droxy-3,8a-dimethyl-5-methyl­ene-4,4a,5,6,9,9a-hexa­hydro­naphtho­[2,3-b]furan-2(8aH)-one

The title compound, C15H18O3, was isolated from Lacta­rius piperatus (Fr.) S. F. Gary collected from the Kunming area in Yunnan province, China. The central cyclo­hexyl ring adopts a chair conformation, while the furan­one ring is close to planar (r.m.s. deviation = 0.0174 Å). The remaining methyl­ene cyclo­hexene ring has a flattened chair conformation. In the crystal, mol­ecules are linked via inter­molecular O—H⋯O and C—H⋯O hydrogen bonds into zigzag chains along the a axis

Oral administration of Ren-shen-yang-rong-tang \u27ninjin\u27yoeito\u27 protects against hematotoxicity and induces immature erythroid progenitor cells in 5-Fluorouracil-induced anemia

金沢大学医薬保健研究域薬学系The purpose of this study was to investigate the efficacy of four different Japanese and Chinese herbal prescriptions, Ren-Shen-Yang-Rong-Tang (Ninjin\u27yoeito, NYT), Chai-Hu-Gui-Zhi-Gan-Jiang-Tang (Saikokeishikankyoto, SKKT), Si-Jun-Zi-Tang (Shikunshito, SKT) and Si-Wu-Tang (Shimotsuto, SMT), which are traditionally used for anemia and fatigue, against hematotoxicity in mice treated with 5-fluorouracil (5-FU). NYT 1100 mg kg-1 day-1 injected orally for 7 consecutive days before and after 5-FU injection significantly suppressed reductions in red blood cell, white blood cell and platelet counts in peripheral blood, and accelerated their recovery. Administration of SKKT also produced a slight but significant improvement in 5-FU-induced erythrocytopenia, whereas SMT and SKT could not prevent anemia. Oral injection of NYT also inhibited 5-FU-induced decreases in peripheral reticulocyte and bone marrow cell counts on day 10, and markedly hastened their recovery on day 20, in a dose-dependent manner. Erythroid progenitor colonies, such as colony forming units-erythroid and burst forming units-erythroid, formed by marrow cells from mice treated with 5-FU were significantly increased by oral administration of NYT. These findings suggest that NYT has the potential to protect against hematotoxicity, and also has hematopoietic activity, through stimulation of immature erythroid progenitor cell differentiation.出版者許諾要件により全文公開は2010年7月より