Hiroshima University

About: Hiroshima University is a education organization based out in Hiroshima, Japan. It is known for research contribution in the topics: Population & Cancer. The organization has 33602 authors who have published 69290 publications receiving 1495648 citations. The organization is also known as: Hiroshima Daigaku.

A novel biomimetic zinc(ii)-fluorophore, dansylamidoethyl-pendant macrocyclic tetraamine 1,4,7,10-tetraazacyclododecane (cyclen)

Abstract: On the basis of the chemical principle of carbonic anhydrase (CA)−aromatic sulfonamide inhibitor interaction, a dansylamidoethyl−pendant cyclen (1-(2-(5-(dimethylamino)-1-naphthalenesulfonamido)ethyl)-1,4,7,10-tetraazacyclododecane, HL) has been synthesized as a novel type of zinc(II)−fluorophore. The new ligand HL forms very stable complexes (ML) with zinc(II), cadmium(II), and copper(II) at physiological pH. The potentiometric and spectrophotometric pH-titration study disclosed the 1:1 metal(II) complexes stability constants log K(ML) (= log([ML]/[M][L])) to be 20.8 ± 0.1 for ZnL, 19.1 ± 0.1 for CdL, and >30 for CuL. The crystalline zinc(II) complex ZnL was isolated from aqueous solution at pH 7. The X-ray crystal study of ZnL disclosed a five-coordinate, distorted square-pyramidal structure with the deprotonated dansylamide N- coordinating at the apical site. Crystals of the monoperchlorate salt of ZnL (C22H35N6O6SClZn) are orthorhombic, space group Pna21 (no. 33) with a = 23.777(3) A, b = 12.744(5) A,...

Hexagonally deformed Fermi surface of the 3D topological insulator Bi2Se3.

Abstract: A hexagonal deformation of the Fermi surface of ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ has been for the first time observed by angle-resolved photoemission spectroscopy. This is in contrast to the general belief that ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ possesses an ideal Dirac cone. The hexagonal shape is found to disappear near the Dirac node, which would protect the surface state electrons from backscattering. It is also demonstrated that the Fermi energy of naturally electron-doped ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ can be tuned by 1% Mg doping in order to realize the quantum topological transport.

J/psi Suppression at Forward Rapidity in Pb-Pb Collisions at root s(NN)=2.76 TeV

Abstract: The ALICE experiment has measured the inclusive J/psi production in Pb-Pb collisions at root s(NN) = 2.76 TeV down to zero transverse momentum in the rapidity range 2.5 < y < 4. A suppression of the inclusive J/psi yield in Pb-Pb is observed with respect to the one measured in pp collisions scaled by the number of binary nucleon-nucleon collisions. The nuclear modification factor, integrated over the 0%-80% most central collisions, is 0.545 +/- 0.032(stat) +/- 0.083dsyst_ and does not exhibit a significant dependence on the collision centrality. These features appear significantly different from measurements at lower collision energies. Models including J/psi production from charm quarks in a deconfined partonic phase can describe our data.