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  • 1995-1999  (54)
  • 1990-1994  (83)
  • 1985-1989  (51)
  • 1925-1929  (3)
  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 101 (1994), S. 0 
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Objectives In a cohort of term infants with cerebral depression at delivery, to investigate the association of perinatal signs of birth asphyxia, particularly abnormal fetal heart rate patterns in labour, acidaemia, and serious neonatal encephalopathy, with neurodevelopmental outcome at age five years.Design Five year follow up study of a birth cohort.Setting Regional maternity hospital.Subjects One hundred and eighty-four singleton infants with a 1 min Apgar score ≤ 3, born at term between January 1984 and September 1985.Main outcome measures Neonatal death, cerebral palsy, and scores on a battery of neurodevelopmental tests at age five.Results Seven infants had a cluster of perinatal signs suggestive of birth asphyxia; all included serious neonatal encephalopathy. Three of these infants died neonatally, three had spastic quadriparesis with profound developmental delay, and one was unimpaired at the age of five. Among the remaining infants, no association was found between severely abnormal fetal heart rate patterns in labour and scores on neurodevelopmental tests, or between acid–base status at delivery and test scores.Conclusions Birth asphyxia, identified by a cluster of abnormal perinatal signs, including serious neonatal encephalopathy, has a poor prognosis. If serious encephalopathy is not present, cerebral depression at birth preceded by abnormal fetal heart rate patterns in labour, or with acid–base derangement, is not predictive of later impairment.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 101 (1994), S. 0 
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Objective To examine the potential value of maternal serum levels of pregnancy-associated plasma protein A (PAPP-A) and pregnancy-specific βl-glycoprotein (SP1) in the detection of fetal trisomy.Design Cross-sectional study.Setting The Harris Birthright Research Centre For Fetal Medicine, King's College Hospital Medical School, London, UK and Division of Maternal-Fetal Medicine, Jefferson Medical College, Philadelphia, USA. Subjects and methods Maternal serum PAPP-A and SP1 concentrations were measured at 10 to 13 weeks gestation in samples from 42 pregnancies with fetal trisomy (trisomy 21, n= 29; trisomy 18, n= 9; trisomy 13, n= 4) and in samples from 210 matched controls.Results In controls, both maternal serum PAPP-A and SP1 increased significantly with gestation and in trisomic fetuses levels of both hormones were reduced. However, discriminant analysis demonstrated that SP1 did not contribute significantly in the distinction between trisomic and control pregnancies. Although levels of PAPP-A were reduced throughout the gestational range examined (10 to 13 weeks), especially in cases with fetal trisomy 21, the deviation was more pronounced at 10 to 11 weeks than at 12 to 13 weeks gestation. In 45% of pregnancies with fetal trisomy 21 and 70% of pregnancies with trisomies 18 or 13 maternal serum PAPP-A levels at 10 to 11 weeks gestation were below the 5th centile of the normal range.Conclusion Maternal serum PAPP-A concentration in the first trimester of pregnancy may prove to be useful in the prediction of risk for fetal trisomies.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 95 (1988), S. 0 
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Langmuir 4 (1988), S. 277-282 
    ISSN: 1520-5827
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 1191-1195 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: ZnTe films have been grown with Zn:Te flux ratios ranging from 1 to 3.2. The highest quality films have been grown with flux ratios between 2 and 3, substrate temperatures between 300 and 325 °C, and a surface reconstruction that is a combination of c(2×2) and (2×1). Films grown under these conditions have x-ray rocking curve half-widths between 125 and 225 arcsec. Photoluminescence spectra show that the relative intensity of emission related to Zn vacancies decreases with increasing Zn:Te ratio. Picosecond photoconductivity measurements show an initial decay rate for photoexcited carriers that correlates well with other material parameters. After several hundred picoseconds, the decay rates for different samples show exponential behavior with a lifetime of approximately 675 ps.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6722-6724 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We explore the inhomogeneous and homogeneous contributions to the exciton linewidth that have allowed the recent observation of room temperature excitonic absorption in II–VI semiconductor quantum wells. Our measurements of the absorption spectrum in a range of CdxZn1−xTe/ZnTe quantum well heterostructures indicate that temperature-dependent contributions to the exciton linewidth are influenced by alloy composition.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 75-77 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have studied CdZnTe/ZnTe multiple quantum wells which have alloy wells and strained layers. Low-temperature Raman spectra reveal a strain-induced shift of the longitudinal optic phonon energy consistent with a strain coherently shared between well and barrier layers. In resonant Raman profiles, we observe strong incoming and outgoing resonances at the n=1 heavy hole exciton transition that are well correlated with features in the photoluminescence and excitation spectra. Scattering by the CdTe-like phonon indicates an energy range for exciton localization by alloy fluctuations. The behavior of the ZnTe-like phonon near resonance is interpreted with exciton-polariton relaxation.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 6224-6228 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The objective of this research is to establish a shape-memory effect in sputter-deposited films of nickel titanium. The alloy, generically called nitinol, was prepared from sputtering targets in two different compositions. Films were deposited up to 10 μm in thickness on glass substrates using a dc magnetron sputtering source. The as-deposited films were amorphous in structure and did not exhibit a shape memory. The amorphous films were crystallized with a suitable annealing process, and the transformation properties were measured using differential scanning calorimetry. The crystallized films showed transition temperatures that were much lower than those of the parent material. X-ray diffraction patterns indicated that the films were not a single phase but showed evidence of a second phase. However, the annealed films demonstrated a strong shape-memory effect. Stress/strain measurements and physical manipulation were used to evaluate the shape recovery. These tests demonstrated sustained tensile stresses of up to 480 MPa in the high-temperature phase, and a characteristic plastic deformation in the low-temperature phase.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5397-5399 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We present the results of an investigation of epitaxial Ag/bcc Fe/Ag(001) and Ag/fcc Co/Ag(001) sandwich structures in which we use polarized neutron reflection (PNR) as a direct probe of the absolute value of the magnetic moment per atom in order to test recent theoretical calculations for these systems. An 8-ML bcc 57Fe and a 2-ML fcc Co film were found to display planar anisotropy at 300 K from surface magneto-optic Kerr effect measurements, and were selected for PNR measurements in the temperature range 4–300 K with the films magnetically saturated in-plane. The flipping ratio observed for the 8-ML 57Fe film is consistent with a ferromagnetic moment in the range 0.9–1.1 Bohr magnetons, which is significantly reduced from the bulk value, in contrast with recent theoretical predictions of a strongly enhanced ferromagnetic moment for this epitaxial system. No temperature dependence of the magnetization is detected, confirming the anticipated bulklike behavior. For the 2-ML fcc Co film, the observed flipping ratio is consistent with a ferromagnetic moment in the range 1.8–2.2 Bohr magnetons, which is significantly enhanced from the bulk hcp value, in agreement with recent theoretical calculations. No temperature dependence of the Co magnetization was detected.
    Materialart: Digitale Medien
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