In the crystal structure of the polyiodide complex (p-nitrophenyl-alpha-maltohexaose(2)) . Ba(I(3))(2) . 22H(2)O, the maltohexaose units form an antiparallel, left-handed double helix with O-2 ... O-3 and O-6 ... O-6 hydrogen bonding and a central cavity that encloses two triiodide units. This structure contrasts with the parallel, left-handed double helix with no central cavity proposed for the A-and B-starch helix and the left-handed single helix in V-amylose and may be relevant for the stabilization of glycogen Structure.
Im Gleichstromlichtbogen bei oxydierender Atmosphäre hergestelltes Eisenoxidaerosol stellt entgegen der Literatur ein Phasengemisch dar, aus dem eine neue Phase ϵ‐Fe2O3 isoliert werden konnte. ϵ‐Fe2O3 ist dunkelbraun und ferrimagnetisch mit einer Magnetanomalie bei 225°C.
Bei einer Temperatur ab 500°C geht es in α‐Fe2O3 über. Elementarzelle: Monoklin; a0 = 12,97 Å; b0 = 10,21 Å; c = 8,44 Å; β = 95° 20′ Z = 20; ϱ RÖ = 4,78 g/cm3.
γ‐Fe2O3‐Präparate der verschiedensten Herstellungsverfahren ergeben stets identische Zählrohrdiagramme. Sämtliche auftretenden Interferenzen, einschließlich der sehr schwachen, stehen im Einklang mit der tetragonalen Elementarzelle a0 = 8,33 Å, c/a = 3. „Reines γ‐Fe2O3”︁ bildet eine einheitliche definierte Phase und bedarf keiner Fremdionen zur Stabilisierung.
Parisi s replica-symmetry-breaking scheme is applied to the quantum Sherrington-Kirkpatrick Ising spin glass in a transverse magnetic field. The order-parameter function q(x) is calculated near Tg, while for all temperatures the first stage of replica-symmetry breaking is calculated. Internal energy, entropy, and magnetic susceptibility are calculated in order to investigate the quality of both the replica-symmetric and the replica-symmetry-broken theories.
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