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Sökning: WFRF:(Ruck A) > Kungliga Tekniska Högskolan

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1.
  • Granville, S, et al. (författare)
  • Optical conductivity and x-ray absorption and emission study of the band structure of MnN films
  • 2005
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 72:20, s. 205127-
  • Tidskriftsartikel (refereegranskat)abstract
    • The band structure of MnN films prepared by ion assisted deposition has been investigated by optical conductivity and x-ray absorption and emission spectroscopies. X-ray diffraction and extended x-ray absorption fine structure show the films to be nanocrystalline but phase pure and exhibiting the known antiferromagnetic distorted rocksalt phase. X-ray emission spectroscopy of the N K-edge and x-ray absorption near edge spectroscopy of both the N K- and Mn L-edges are used to probe the occupied and empty densities of states, which compare well with the N(2p) and Mn(3d) partial densities of states calculated using the linearized muffin-tin orbital band structure method. A similar comparison is made between the measured optical conductivity and the calculated contribution from interband transitions. It is possible to associate the main features in the measured spectrum with corresponding ones in the calculated optical function. The major differences between calculated and measured spectra can be understood on the basis of a limited electron mean-free-path in these nanocrystalline films, which broadens the features in the joint density of states and relaxes the momentum conservation requirement. The calculated optical functions are analyzed in detail in terms of their dominant band-to-band contributions and in addition the polarization dependence is predicted. Temperature dependent conductivity measurements are also reported and show a clear metallic behavior and a weak Kondo-like low temperature anomaly.
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2.
  • Isaeva, Anna A., et al. (författare)
  • New metal-rich mixed chalcogenides with intergrowth structures : Ni8.21Ge2S2 and Ni8.45Ge2Se2
  • 2009
  • Ingår i: Solid State Sciences. - : Elsevier BV. - 1293-2558 .- 1873-3085. ; 11:6, s. 1071-1076
  • Tidskriftsartikel (refereegranskat)abstract
    • New metal-rich mixed nickel germanium chalcogenides, Ni8.21(1)Ge2S2 and Ni8.45(1)Ge2Se2, were synthesized by a high-temperature ceramic technique. Ni8.21Ge2S2 decomposes incongruently at 798(5) degrees C, while Ni8.45Ge2Se2 is stable only between approximately 600(5) degrees C and 813(5) degrees C. Single crystals were grown from a molten flux and by a recrystallization of presynthesized charge. The X-ray diffraction study revealed that Ni8.21Ge2S2 and Ni8.45Ge2S2 are isostructural and crystallize in the tetragonal system (space group 14/mmm, Z = 2) with a = 3.578(1) angstrom, c = 24.687(5) angstrom, and a = 3.601 (1) angstrom, c = 25.427(6) angstrom, respectively. Their crystal structures comprise heterometallic (2)(infinity) [Ni6Ge2] slabs and are closely related to the Ni8.54Ga2Se2 and Ni8.93Sn2S2 structure types. The geometrical changes of structural units upon p-element substitution in all known Ni(10-delta)E(2)Q(2) (E = element of group 13 or 14; Q = chalcogen) compounds are discussed. The relation to the intergrowth structure of Ni5.46GeSe2 is analyzed.
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3.
  • Sarkar, N., et al. (författare)
  • Effects of intramyocardial injection of phVEGF-A(165) as sole therapy in patients with refractory coronary artery disease - 12-month follow-up : Angiogenic gene therapy
  • 2001
  • Ingår i: Journal of Internal Medicine. - : Wiley. - 0954-6820 .- 1365-2796. ; 250:5, s. 373-381
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective. To test the safety and bioactivity of phVEGF-A(165) after intramyocardial injection during 12-month follow-up. Design. Open-labelled study. Subjects. Inclusion criteria were angina pectoris, Canadian Cardiovascular Society (CCS) class III-IV, unamenable to further revascularization, ejection fraction (EF) >30%, perfusion defects extending over >10% of the anterolateral left ventricle wall detectable with adenosine single photon emission computerized tomography (SPECT) and at least one patent vessel visible by coronary angiography. Seven of 39 patients referred for gene therapy were included. Intervention. Via a mini-thoracotomy under general anaesthesia, phVEGF-A(165) was injected directly into the myocardium at four sites in the anterolateral region of the left ventricle. Results. Operative procedures were uneventful. Perioperative release of myocardial markers and electrocardiogram (ECG) changes were detected in two patients. There were no perioperative deaths but one patient died 7 months postoperatively because of myocardial infarction. Plasma vascular endothelial growth factor (VEGF)-A levels increased two to threefold peaking 6 days postoperatively (P<0.004) and returning to baseline by day 30. A significant reduction in angina pectoris was reported. The CCS class improved from 3.30.2 to 1.9 +/-0.3 (P<0.01) and nitroglycerine intake decreased from 3915 to 12 +/-5 tablets week(-1) (P<0.001) 2 months after gene transfer. Improvements remained after 12 months when nitroglycerine consumption approached zero. Improved myocardial function in the phVEGF-A(165) injection region was documented in all patients (P<0.016) by tissue velocity imaging (TVI). Reduced reversible ischaemia was detected by adenosine SPECT in four patients. Improved collateralization was detected in four patients with coronary angiography. Conclusion. Intramyocardial injection of phVEGF-A(165) is safe and may lead to improved myocardial perfusion and function with longstanding symptomatic relief in end-stage angina pectoris. Based on these results this therapeutic potential is being tested in a double-blind placebo controlled multicentre trial, EUROINJECT ONE.
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4.
  • Sylven, C., et al. (författare)
  • Myocardial Doppler tissue velocity improves following myocardial gene therapy with VEGF-A(165) plasmid in patients with inoperable angina pectoris
  • 2001
  • Ingår i: Coronary Artery Disease. - : Ovid Technologies (Wolters Kluwer Health). - 0954-6928 .- 1473-5830. ; 12:3, s. 239-243
  • Tidskriftsartikel (refereegranskat)abstract
    • Background Myocardial tissue velocity and perfusion were studied in patients with severe angina pectoris following gene therapy by intramyocardial injection of phVEGF-A(165) via thoracotomy. Plasma concentrations of VEGF-A increased postoperatively. Two months after treatment anginal status and myocardial tissue velocity improved and perfusion showed a tendency to improve. Tissue velocity imaging appears to be a sensitive, objective method for detecting changes in myocardial function following gene therapy. Objective To study effects on myocardial tissue velocity and perfusion in patients with angina pectoris following intramyocardial injection of phVEGF-A(165) via thoracotomy. Design Open label, phase I/II. Methods Six patients with Canadian Cardiovascular Society (CCS) angina pectoris functional Glass III - IV and with major defects at adenosine stress single-photon emission computerized tomography (SPECT) were studied. In addition to SPECT, coronary angiography and dobutamine stress echocardiography with tissue Doppler velocity imaging were performed before and two months after gene transfer. Results Plasma concentrations of VEGF-A increased 2 to 3 times (P < 0.04) over baseline from 2 to 14 days after injection with normalization after 4 weeks. The CCS class improved about 40%, from 3.3 +/- 0.2 to 2.0 +/- 0.3 (P < 0.02) and nitroglycerine consumption decreased 30 - 40%, from 44 +/- 17 to 15 +/- 5 tablets per week (P < 0.05). The maximal systolic myocardial tissue velocity increased in all patients about 25% (P < 0.02) but did not reach the reference range. Myocardial perfusion at SPECT improved in four of the six patients. Conclusions Anginal status, myocardial tissue velocity and perfusion can be improved by phVEGF-A(165) intramyocardial injection. Tissue velocity imaging appears to be a sensitive, objective method for detecting changes in myocardial function following gene therapy. Coron Artery Dis 12:239-243
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5.
  • Wahl, Bernhard, et al. (författare)
  • A One-Dimensional Metal Embedded in Salt Matrices : Synthesis, Modulated Crystal Structures, Electrical Conductivity, and Chemical Bonding of (1)(infinity) PdBi6 (Bi,Sn)(1-delta)Br5-delta
  • 2009
  • Ingår i: Zeitschrift für Anorganische und Allgemeines Chemie. - : Wiley. - 0044-2313 .- 1521-3749. ; 635:12, s. 1979-1985
  • Tidskriftsartikel (refereegranskat)abstract
    • The metal-rich compounds (1)(infinity)[PdBi6][(Bi,Sn)(1-delta)Br5-delta,] with delta(1) = 2/13, delta(1)' = 5/26, or delta(2) = delta(2)' = 2/12 were synthesized from Bi2Pd, BiBr3, and Sn at 300 degrees C. The crystal structures contain intermetallic rods (1)(infinity)[Pd@Bi2/1Bi8/2](2.5+) embedded in salt-like matrices, which consist of groups of bromido-bismuthate(III)-stannate(II) octahedra [(Bi,Sn)(n)Br4n+2](m-) (n = 2, 3) and isolated Br- ions. Metrical incompatibilities of the two subsystems in the crystalline metal-salt hybrid result in non-stoichiometry of the salt pan associated with complex superstructures. The average structure is described in the orthorhombic space group Pmmm with a approximate to 408 pm, b approximate to 2263 pm, c approximate to 849 pm. It feigns statistical distribution of vacancies and orientational disorder of the concatenated octahedra. By choosing the modulation vectors q(i) = 2/ta* + 1/2b* + 1/2c* with t(1) = 13 or t(2) = 12, the additional weak reflections of the diffraction patterns are indexed. Ordered structure models are achieved in the [3+1]-dimensional superspace group Pmmm(alpha 1/21/2)000. Metallic conductivity along [100], i.e. the direction of the (1)(infinity)[Pd@Bi2/1Bi8/2](2.5+) rods, was determined for a single-crystal. One-dimensional band structure calculations reveal Bi p-bands crossing the Fermi level for formula charges higher than 2+. The electron localization indicator (ELI) indicates two-center Bi-Bi bonds as well as multi-center bonds inside the metallic part, whereas the bismuth l one-pairs point towards the non-conducting part of the structure.
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6.
  • Wahl, Bernhard, et al. (författare)
  • Nobel-Metal Centered Polycations Au@Bi-10 (5+) or Pd@Bi-10 (4+) Embedded in Halogenido-Bismuthate(III)-Stannate(II) Frameworks
  • 2009
  • Ingår i: Zeitschrift für Anorganische und Allgemeines Chemie. - : Wiley. - 0044-2313 .- 1521-3749. ; 635:4-5, s. 743-752
  • Tidskriftsartikel (refereegranskat)abstract
    • The metal-rich halogenides AuBi14 delta Sn2+delta X21-delta (delta approximate to 0.4) and PdBi15 delta Sn2+delta X21-delta (delta approximate to 0.6) with X = Cl. Br were crystallized from melts of the metals and BiX3. In the rhombohedral structures (space group R (3) over bar: a approximate to 1050 pm: alpha approximate to 94 degrees), noble-metal centered pentagonal antiprisms [Au@Bi-19](5+) resp. [Pd@Bi-19](4+) are embedded in halogenidometallate frameworks (3)(x)[Bi-4 delta Sn2+delta X21-delta](5) resp. (3)[Bi-4 delta Sn2+delta X21-delta](4). Mixed Bi-III/Sn-II site occupation allows the framework to adopt different charges. Further exchange of (BiX3)-X-III against (SnX2)-X-II results in vacancies (delta) on the position of an isolated halide ion. In quantum chemical calculations the naked metal-clusters are found to be stable in D-5d symmetry with interatomic distances close to the observed ones. The significance of interactions between the Wade-type host cluster Bi-10(4+) and the closed-subshell guest atoms Au+ or Pd-0 is reflected in the molecular orbital diagram, the population analyses and the ELI-D.
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7.
  • Wahl, Bernhard, et al. (författare)
  • The molecular cluster Bi10Au2 (SbBi3Br9)(2)
  • 2008
  • Ingår i: Angewandte Chemie International Edition. - : Wiley. - 1433-7851 .- 1521-3773. ; 47:21, s. 3932-3935
  • Tidskriftsartikel (refereegranskat)
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