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  • 1
    Electronic Resource
    Electronic Resource
    Concentration of placental protein 19 in body fluid and placental tissues (1990)
    Springer
    Archives of gynecology and obstetrics 247 (1990), S. 83-93 
    Details
    ISSN: 1432-0711
    Keywords: PP19 ; Concentration ; Body fluids ; Placental tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Placental protein 19 (PP19) is one of the new placental tissue proteins identified in extracts from human term placenta by Bohn and Winkler [1]. We measured the PP19 concentration in body fluids and placental tissue by radioimmunoassay; the minimum detectable dose of standard was 1.5 ng/ml. Although ethylene diamine tetraacetic acid (EDTA-2K) inhibited the immunoreaction between PP19 (225/242) and anti-PP19 antibody (632 ZA), the PP19 concentration did not differ between serum and heparin and sodium citrate plasmas. The serum PP19 concentration was increased by hemolysis. In blood cell fractions separated by the Ficoll-Paque/Macrodex method, polymorphonuclear leukocyte fraction contained the highest PP19 concentration. The circulating serum PP19 concentration was 4.5±1.1 ng/ml (mean ± standard deviation) in the proliferative phase (n=8) and 5.1±1.6 ng/ml in the secretory phase (n=7) for nonpregnant women, and 4.6±2.2 ng/ml from men (n=12). Seminal plasma (n=8) contained 212.2±99.7 ng/ml. The maternal serum PP19 concentration in 291 normal pregnancies increased from 6.2 ng/ml (median) at 6–7 weeks of gestation to 34.1 ng/ml at 38–39 weeks. The mean PP19 concentration was higher in amniotic fluid and retroplacental blood, but lower in umbilical cord blood than that in circulating maternal serum. In hydatidiform mole, vesicular fluid contained high PP19 concentration (1154.6±659.5 ng/ml), although these maternal serum concentration was not statistically higher than normal range. The chorionic villous trophoblast contained more PP19 than decidua, chorion, and amnion. These results suggest that PP19 has an extraplacental source, even though the chorionic villous trophoblast may be the main source throughout pregnancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02390665
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  • 2
    Electronic Resource
    Electronic Resource
    Perpendicular magnetic anisotropy in Pt/Fe multilayers : 35th annual conference on magentism and magnetic materials San Diego, California (USA) 29 Oct − 1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5658-5660 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Perpendicular magnetic anisotropy (K⊥) and related magnetic properties in Pt/Fe multilayers [compositionally modulated multilayer films (CMFs)] are investigated. It is found that Pt/Fe CMFs with about an 18-A(ring) Pt layer and Fe layer below 5 A(ring) become perpendicularly magnetized films. Surface magnetic anisotropy (Ks) and volume anisotropy (Kv) are 0.46 erg/cm2 and about − 2 × 107 erg/cm3 at room temperature, respectively. The Ks is almost equivalent to that of Pt/Co CMFs and increases with decreasing temperature. The absolute value of Kv, however, is much larger than that of the Pt/Co system. The effective magnetic anisotropy (K⊥ eff) of [Fe(4.7 A(ring))/Pt(18.5 A(ring))]80 CMF changes from positive to negative at T(approximately-equal-to)200 K with decreasing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347927
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  • 3
    Electronic Resource
    Electronic Resource
    Simultaneous observation of the smoke signals during the growth of bcc Fe on the Ag(100) surface (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5394-5396 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Simultaneous observation of the surface magneto-optic Kerr effect (SMOKE) and reflection high-energy electron diffraction (RHEED) intensity oscillation was done during the epitaxial growth of bcc Fe on fcc Ag(100) surface. The SMOKE system using the high-frequency (100 kHz) ac method has a high sensitivity (10−4 deg) and is able to obtain an absolute value of the Kerr rotation angle (φK ). φK of Fe/Ag(100) was measured at room temperature under magnetic fields of 0 and 100 Oe. When film thickness (d) is thicker than five monatomic layers (ML's), φK of the longitudinal Kerr effect at 100 Oe increases with increasing d. No longitudinal SMOKE signal, however, was observed below 5 ML, while a polar Kerr signal was observed only in the range of 4 ML〈d〈5 ML. This suggests that the magnetic easy axis changes from perpendicular to in-plane at 5 ML, and below 4 ML the film is hardly magnetized by 100 Oe because of its high coercivity. These properties are discussed in relation to the crystal growth mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344564
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  • 4
    Electronic Resource
    Electronic Resource
    In situ observation of the strain of Co and Ni deposited on Pd (111) by reflection high energy electron diffraction (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 3180-3183 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co/Pd(111) and Ni/Pd(111) bilayer films were grown epitaxially on single crystal MgO (111) substrates by ultrahigh vacuum deposition. In situ observation of the strain of Co and Ni deposited on Pd (111) plane was performed by reflection high energy electron diffraction (RHEED) during fabrication. From RHEED patterns it was confirmed that the lattice constant of a Co film of 2 A(ring) in thickness deposited on Pd was about 3.7 A(ring), which was different from that of Pd (3.89 A(ring)). The strain (εCo) of the Co layer was rapidly released during further Co deposition. The strain εCo of the third Co monatomic layer on Pd is nearly equal to zero. The large strain of the Co layer is localized at about one or two monatomic layers of the interface between Co and Pd. On the other hand, a Ni film deposited on Pd was not strained from the beginning of the deposition. The relationship between the perpendicular magnetic anisotropy of Co/Pd and Ni/Pd compositionally modulated multilayer films and the strain of Co and Ni is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349300
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  • 5
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of single-crystal Fe/Au(100) superlattices synthesized using RHEED oscillation (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5403-5405 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-crystal bcc-Fe/fcc-Au(100) artificial superlattices have been synthesized by the molecular-beam epitaxy (MBE) method using reflection high-energy electron diffraction (RHEED) intensity oscillation. Magnetic properties of the superlattices consisting of the alternations of about 3.6 ML of Fe and Au layers have been studied. The extrapolated magnetic moment per Fe atom at 0 K is estimated as 2.18±0.10 μB. An enhancement of the Fe moment predicted theoretically has not been observed. The linear temperature dependence of magnetization is observed below 200 K in the Fe/Au superlattices. It turns out that the magnetocrystalline anisotropy (Ku) which points to film normal as an easy axis appears after subtracting the shape anisotropy energy. The magnitude of the Ku corresponds with the value theoretically predicted. Annealing experiments have been also done.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344567
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  • 6
    Electronic Resource
    Electronic Resource
    In situ measurement of stress in Co/Cu, Co/Pd, and Co/Au compositionally modulated multilayer films (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 4569-4572 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Temporal changes of sign and magnitude of the intrinsic stress during ultra-high vacuum deposition of Co/Cu, Co/Pd, and Co/Au compositionally modulated multilayer films (CMF's) were investigated by means of a cantilever technique. The intrinsic stress corresponding to monatomic layers could be detected during deposition. The intrinsic stress in Co layers deposited on Cu, Pd, and Au layers is tensile and the stress of Cu, Pd, and Au layers on Co is compressive. The intrinsic stress of a Co layer on Cu in Co/Cu CMF approaches near to the ideal critical shear stress of the perfect crystal, 1×1011 dyn/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346163
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  • 7
    Electronic Resource
    Electronic Resource
    Thickness dependent binary behavior of elongated single-domain cobalt nanostructures (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 404-409 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the switching behavior of single-domain cobalt nanostructures using a combination of magnetometry and magnetic force microscopy. The elongated nanostructures are 80×140 nm wide, and range in thickness from 14 to 30 nm. Structures thinner than 20 nm form a single-domain binary system featuring two preferred orientations of the magnetization. An additional double-domain configuration becomes increasingly favorable as the thickness approaches 30 nm. The onset of this double-domain state agrees with previously reported numerical calculations. We also present a quantitative study of interparticle coupling in tightly packed arrays. The local dipolar field increases the squareness of the hysteresis loop as the interparticle separation decreases below 400 nm. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371875
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  • 8
    Electronic Resource
    Electronic Resource
    Anisotropy of magnetoresistance in (110)La0.7Sr0.3MnO3 thin films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4797-4799 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed magnetization and magnetoresistance measurements on (110)La0.7Sr0.3MnO3 thin films in order to understand the role of in-plane uniaxial magnetic anisotropy in the magnetoresistance. Transport measurements with current flowing along the magnetically easy [001] and magnetically hard [11¯0] directions exhibit a linear dependence of magnetoresistance on field at high fields due to bulk colossal magnetoresistance. The low field behavior depends not only on the angle of the magnetization with the current but also the direction of the current in the crystal. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370485
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  • 9
    Electronic Resource
    Electronic Resource
    Negative ion production in a large semicylindrical ion source : Proceeding of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2699-2701 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A large semicylindrical negative ion source, whose dimensions are 34 cm in diameter and 104 cm in length, has been developed. By optimizing a chamber depth and a filter strength, a H− current of 650 mA (7.7 mA/cm2) was obtained at an arc condition of 1.3 Pa, 70 V, and 1200 A. In order to increase the H− current and to reduce an operating pressure, a small amount of Cs was injected. As a result, the H− current was increased from 550 mA (6.5 mA/cm2) to 850 mA (10 mA/cm2) under an arc power of 70 V×800 A. The most significant feature of the cesium effect was the reduction of the operating pressure. With maintaining the sufficient current of 670 mA (8 mA/cm2), the operating pressure could be lowered to 0.03 Pa. At this pressure, the highest gas efficiency of 20% was achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142827
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  • 10
    Electronic Resource
    Electronic Resource
    Long pulse operation of a cesium-seeded multicusp H− ion source : Proceeding of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2708-2710 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: It is demonstrated that a cesium-seeded volume H− ion source can be operated very stably for long pulse durations of up to 24 h. The source consists of a 20 cm cylindrical multicusp plasma generator and a 9 cm × 10 cm multiaperture extractor. By seeding a small amount of cesium, the source has produced 50 keV, 0.5 A, 1000 s H− ion beams with a current density of 14 mA/cm2. The cesium effect lasted for more than 24 h once 100 mg cesium was seeded before operation. Power flow measurement revealed that the heat loading of the ion source was low enough to operate the source in the dc mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142830
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