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  • 1
    ISSN: 0044-2313
    Keywords: Lithium ; Rare Earth Halides ; Crystal Structures ; Ionic Motion ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ternary Halides of the A3MX6 Type. VI. Ternary Chlorides of the Rare-Earth Elements with Lithium, Li3MCl6 (M = Tb—Lu, Y, Sc): Synthesis, Crystal Structures, and Ionic MotionSingle crystal X-ray studies on the ternary chlorides Li3ErCl6, Li3YbCl6 and Li3ScCl6 show that they crystallize in three different structure types. Li3ErCl6 (trigonal, P3ml, Z = 3, a = 1117.7(2); c = 603.6(2) pm; the chlorides with M = Tb—Tm, Y are isotypic) and Li3YbCl6 (orthorhombic, Pnma, Z = 4, a = 1286.6(1); b = 1113.2(1); c = 602.95(8) pm; Li3LuCl6 is isotypic) have very similar structures that may be derived from hexagonal closest packings of chloride ions with the cations occupying octahedral holes in part statistically. Li3ScCl6 (monoclinic, C2/m, Z = 2, a = 639.8(1); b = 1104.0(2); c = 639,1(1) pm; β = 109.89(1)°) crystallizes isotypic with Na3GdI6 and Li3ErBr6, structures that may be derived from a cubic closes packings of anions. The ionic movement in Li3YCl6 and Li3YbCl6 has been investigated by impedance and 7Li-NMR spectroscopy.
    Notes: Die ternären Chloride Li3ErCl6, Li3YbCl6 und Li3ScCl6 kristallisieren nach röntgenographischen Untersuchungen an Einkristallen in drei verschiedenen Strukturtypen. Li3ErCl6 (trigonal, P3ml, Z = 3, a = 1117,7(2); c = 603,6(2) pm; isotyp mit M = Tb—Tm, Y) und Li3YbCl6 (orthorhombisch, Pnma, Z = 4, a = 1286,6(1); b = 1113,2(1); c = 602,95(8) pm; Li3LuCl6 ist isotyp) haben sehr ähnliche Strukturen, die sich als hexagonal-dichteste Kugelpackungen von Chlorid-Ionen mit zum Teil statistischer Auffüllung der Oktaederlücken mit Kationen beschreiben lassen. Li3ScCl6 (monoklin, C2/m, Z = 2, a = 639,8(1); b = 1104,0(2); c = 639,1(1) pm; β = 109,89(1)°) kristallisiert isotyp mit Na3GdI6 und Li3ErBr6; die Anionen bilden hier eine kubisch-dichteste Kugelpackung. Die Ionenbewegung in Li3YCl6 und Li3YbCl6 wurde mittels Impedanzspektroskopie und 7Li-NMR-Spektroskopie untersucht.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2004-01-24
    Description: Unlike major histocompatibility proteins, which bind peptides, CD1 proteins display lipid antigens to T cells. Here, we report that CD1a presents a family of previously unknown lipopeptides from Mycobacterium tuberculosis, named didehydroxymycobactins because of their structural relation to mycobactin siderophores. T cell activation was mediated by the alphabeta T cell receptors and was specific for structure of the acyl and peptidic components of these antigens. These studies identify a means of intracellular pathogen detection and identify lipopeptides as a biochemical class of antigens for T cells, which, like conventional peptides, have a potential for marked structural diversity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Moody, D Branch -- Young, David C -- Cheng, Tan-Yun -- Rosat, Jean-Pierre -- Roura-Mir, Carme -- O'Connor, Peter B -- Zajonc, Dirk M -- Walz, Andrew -- Miller, Marvin J -- Levery, Steven B -- Wilson, Ian A -- Costello, Catherine E -- Brenner, Michael B -- AI30988/AI/NIAID NIH HHS/ -- AI50216/AI/NIAID NIH HHS/ -- AR48632/AR/NIAMS NIH HHS/ -- CA58896/CA/NCI NIH HHS/ -- GM25845/GM/NIGMS NIH HHS/ -- GM62116/GM/NIGMS NIH HHS/ -- P20 RR16459/RR/NCRR NIH HHS/ -- P41-RR10888/RR/NCRR NIH HHS/ -- S10-RR10493/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2004 Jan 23;303(5657):527-31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital and Harvard Medical School, Smith Building Room 514, 1 Jimmy Fund Way, Boston, MA 02115, USA. bmoody@rics.bwh.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14739458" target="_blank"〉PubMed〈/a〉
    Keywords: *Antigen Presentation ; Antigens, Bacterial/chemistry/*immunology/metabolism ; Antigens, CD1/chemistry/immunology/metabolism ; Cell Line ; Chromatography, High Pressure Liquid ; Humans ; Hydrogen Bonding ; Hydrophobic and Hydrophilic Interactions ; Hydroxylation ; Lipoproteins/chemistry/*immunology/metabolism ; *Lymphocyte Activation ; Models, Molecular ; Mycobacterium tuberculosis/growth & development/*immunology ; Oxazoles/chemistry/*immunology/metabolism ; Protein Conformation ; Receptors, Antigen, T-Cell, alpha-beta/immunology ; T-Lymphocytes/*immunology ; Transfection
    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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