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  • 1
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7−δ ; pulsed laser deposition ; LaAlO3 ; microwave surface resistance ; thin film microstructure ; TEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Oriented YBa2Cu3O7−δ/LaAlO3/YBa2Cu3O7−δ trilayers were deposited by pulsed laser deposition (PLD) onto 〈100〉 MgO and LaAlO3. Film thicknesses varied from 2000–5000 Å/ layer. A comparision of structure and transport data for the bottom and top superconducting layers indicated a slight decrease in film quality for the top superconducting layer. The critical temperature was lower for the top superconducting layer (90.5 vs. ∼90 K) and the microwave surface resistance was higher (increasing from ∼2 to 18 mω at 36 GHz, 20 K). The resistivity of the dielectric was estimated to be 106 ω cm, and the loss tangent of the dielectric film at microwave frequencies had an upper limit of 0.01. Cross-sectional TEM analysis of the trilayer structure showed a high density of threading dislocations in the dielectric layer that appeared to nucleate at steps in the underlying superconducting layer. The threading dislocations may serve as conduction paths in the LaAlO3 layer.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-7373
    Keywords: glioma ; RMP-7 ; carboplatin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The selective bradykinin analogue, RMP-7, transiently increases the permeability of the blood brain barrier and the delivery of hydrophilic agents into brain tumours. In 87 recurrent glioma patients (WHO Grade III/IV, median age 46, Karnofsky 70%) clinical and Magnetic Resonance Imaging (MRI) responses to i.v. cycles (q 28 days) of RMP-7 (300 ng/kg given as a 10 min infusion) and carboplatin (AUC 4-9) were assessed. 45 of these patients were chemotherapy naive (CN-RMP) and 42 had received one prior course of chemotherapy (CP-RMP). Neurological impairment, performance status and steroid use were measured prior to dosing at each cycle and tumour volume by 3-D MRI at the end of cycles 2, 4, 6, 9 and 12. Clinical evaluation of response demonstrated that 61% of CN-RMP patients were either stable or improved whilst this was 39% for CP-RMP patients, of which 37% and 8% improved respectively. Radiological evaluation showed 79% of CN-RMP patients were either stable, partial or complete responses and 24% for CP-RMP patients, of which 32% and 5% were CR or PR respectively. The median duration of response was 30.3 weeks in CN-RMP patients and 19.6 weeks in the CP-RMP group. Lack of response was associated with substantial baseline tumour volume. Drug toxicity was as previously reported for carboplatin. 11 patients had treatment-associated transient focal seizures. These results indicate that RMP-7 and carboplatin have significant activity in recurrent malignant glioma following radiotherapy.
    Type of Medium: Electronic Resource
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