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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 2039-2041 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The development of a versatile tool to quantify magnetic anisotropies in continuous and patterned magnetic thin films is reported. The technique involves measuring the magnetooptic response to a rotating magnetic field. Similarly to mechanical torque techniques, a single measurement obtains both the anisotropy constants and their symmetry axes distribution. The technique has been applied to analyze arrays of submicrometer stripe-shaped Fe (001) elements with different interelement separations (s). For s larger than 1 μm, the anisotropy associated with the stripes is independent on separation, with a value of the effective uniaxial anisotropy constant very consistent with theoretical estimations for these systems. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3091-3093 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of 200 Å epitaxial Fe (001)/MgO (001) tiling are studied as a function of tile size and separation. For edge sizes above ∼3 μm, the individual tiles maintain the single domain behavior while below ∼3 μm the tiles break into domains due to demagnetizing effects. In addition, below an inter tile separation threshold of about 0.9 μm, a single tile magnetization switch provokes a reversal cascade in all the tiles; while, above this threshold, the individual tile's magnetization switches independently. In this last case, we have experimental access to the distribution of nucleation sites. Thus, we have found a clear signature of the magnetic interaction between patterned epitaxial micro tiles with in-plane magnetization. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für Kardiologie 89 (2000), S. 747-753 
    ISSN: 1435-1285
    Keywords: Key words Renal artery disease – coronary artery disease –¶renal artery stenting –¶arteriosclerosis ; Schlüsselwörter¶Renovaskuläre Erkrankung –¶Ischämische Nephropathie –¶Koronare Herzerkrankung –¶Renale Stentimplantation –¶Arteriosklerose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An 609 Patienten mit Verdacht auf koronare Herzerkrankung (KHK) wurden die Verteilung und der Schweregrad einer begleitenden renovaskulären Erkrankung (RE) untersucht. 152 dieser Patienten (25%) waren von einer RE betroffen. Unter den 399 Patienten mit signifikanten Koronarstenosen (〉50%) fanden sich 143 mit renovaskulärer Beteiligung (35,8%). Geringgradige Veränderungen (20–40% Stenose) stellten sich hierbei in 12,5%, mittelgradige (40–60% Stenose) in 10,5% und höhergradige (〉60% Stenose) in 12,8% der Patienten dar. In allen drei Gruppen zeigte sich signifikant häufiger eine 3-Gefäßerkrankung (GE) als eine 1- oder 2-GE (p〈0,01). Der Effekt einer perkutanen Revaskularisation auf Blutdruck und exkretorischen Nierenfunktion wird für höhergradige Stenosen in der Literatur uneinheitlich bewertet. Bei den 51 Patienten mit Stenose 〉60% führte eine Stentimplantation zu einer signifikanten Reduktion der Blutdruckwerte von 163±30 auf 145±17 mmHg systolisch und von 93±18 auf 83±10 mmHg diastolisch (p=0,008), sowie zur Abnahme der antihypertensiven Medikation (3,2±0,9 auf 2,8±1,0; p=0,005). Die Serumkreatininkonzentration verringerte sich nicht signifikant von 1,46±0,70 auf 1,39±0,58 mg/dl. Die Verteilung der Schweregrade einer RE in einem großen kardiologischen Patientengut liegt jeweils bei ca. 1/3 für gering-, mittel- und höhergradige Nierenarterienstenosen und geht in jeder dieser Gruppen mit einer progredienten KHK einher. Dabei können höhergradige Nierenarterienstenosen durch eine elektive Stentimplantation sicher und blutdruckeffektiv revaskularisiert werden.
    Notes: Summary To explore the relationship between coronary artery disease and renal vascular disease, we performed renal arterial angiography in 609 patients undergoing coronary angiography for suspected coronary artery disease. We defined renal artery stenosis as nonsignificant (〈40%), borderline (40–60%) and significant (〉60%). One-hundred fifty-two patients had renal artery stenosis, while 457 did not. Two-hundred and ten patients had no coronary disease; of these, only 9 had renal artery stenosis. On the other hand, the 143 patients with renal artery stenosis, when subdivided, had similar degrees of coronary disease; three vessel disease was significantly more common than one or two vessel disease in all groups. Renal artery stenosis of all severity degrees was associated with common atherosclerotic risk factors. However, hypertension was not a clue to the presence of renal artery stenosis. To evaluate the effect of percutaneous revascularization on hypertension and renal function all 51 patients with significant renal artery stenosis were treated by primary stent implantation and were follwed up for 6 months. Stent implantation showed a marked decrease in systolic and diastolic blood pressure (163±30 to 145±17 and 93±18 to 83±10 mmHg; p=0.008) with a decrease in the amount of antihypertensive medication but without beneficial effect on serum creatinine during follow-up (1.46±0.70 mg/dl to 1.39±0.58 mg/dl, p=ns). We conclude that renal artery stenosis of any severity is strongly suggestive of three vessel coronary artery disease. The fact that renal stenting lowers blood pressure decreases antihypertensive drugs and increases medication flexibility in patients with coronary artery disease would support the notion of revascularization in patients with significant stenoses.
    Type of Medium: Electronic Resource
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