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  • 1
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective To define the normal ranges of umbilical cord blood oxygen saturation (SaO2) and acid-base status at birth and to evaluate the effect of gestational age on cord blood values in vigorous newborn infants following spontaneous vaginal birth from a vertex position.Design Prospective study.Setting Department of Obstetrics and Gynaecology, University of Graz, Austria.Sample Cord blood samples from 1281 vigorous newborn infants.Methods Cord blood sampling was performed following on newborn infants following spontaneous vaginal birth in a vertex position. SaO2 was measured directly by a spectrophotometer and pH, base excess, pCO2 and pO2 by a pH/blood-gas analyser. Infants with a 5-minute Apgar score ≥ 7 were considered vigorous. Subgroups were classified according to the gestational age: preterm, term and postterm (〈 37, 37–42 and 〉 42 weeks, respectively).Results The median umbilical artery SaO2 was 24.3% and the 2.5th centile was as low as 2.7%. The median umbilical artery values were pH = 7.25, base excess =−4.3 mmol/L and pO2= 16 mmHg. The 2.5th centiles were 7.08, −11.1 mmol/L and 5 mmHg, respectively. The median umbilical artery pCO2 was 50 mmHg and the 97.5th centile was 75 mmHg. The mean umbilical artery and vein SaO2 values were not significantly influenced by gestational age. The umbilical artery SaO2 and base excess values were strongly skewed. The mean umbilical artery pH values in preterm infants were higher than in other subgroups. The mean umbilical artery and vein base excess values were lower in post-term newborn infants than in other subgroups.Conclusions The physiological range of oxygen saturation in umbilical cord of vigorous newborn infants at birth is wide and skewed. In contrast to pH and base excess, umbilical cord blood oxygen saturation is not influenced significantly by gestational age at birth.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Collective scattering of CO2 laser light on electrons is used to determine the radial scale length of the discharge structures occurring in a closed cycle magnetohydrodynamic generator. Hetero- dyne detection of scattered radiation is used to obtain a spatial resolution in the submillimeter range and to increase the signal to noise ratio. A discharge model is formulated to interpret the measured signals. The scale length of the electron density fluctuations is found to be (2.5±0.5) ×10−4 m.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 3075-3080 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A user-selectable, multimode, beta-ionization cell has been developed for gas chromatographic (GC) detection. The system consists of a modified dc current (nonpulsed) electron capture cell enclosed in a stainless-steel vacuum chamber. A gas mixing manifold connected to the input of the detector enables various reagent gases to be mixed with the GC effluent prior to entering the detector cell. Simply by varying the pressure of the reagent gas inside the detector from atmospheric to as low as 50 mTorr, one of four different modes of operation can be achieved. These include (1) conventional electron capture detection (atmospheric pressure), (2) cross-section ionization electron emission (〈1 Torr), (3) low-pressure argon ionization electron emission (1–10 Torr), and (4) mixed electron capture/electron emission (100–300 Torr). One advantage of this detector is the ability to switch between selective detection (electron capture) and universal detection (argon ionization) by only changing the operating pressure in the cell. Another important feature is that the degree of selectivity is continuously tunable in the mixed electron capture/electron emission mode of operation. This is due to a dramatic pressure dependent competition between argon ionization electron emission and capture of near-thermal electrons by compounds passing through the detector. This selectivity appears to be strongly related to the electron affinity of compounds, with those exhibiting the highest electron affinities capable of capturing electrons at the lowest pressures. This enables classes of compounds, such as polychlorinated biphenyls (PCBs), to be detected in the presence of hydrocarbons. Additionally, compounds such as isomeric polycyclic aromatic hydrocarbons (PAH) can be readily distinguished using this detector.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 71-79 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the magnetized plasma of a hollow cathode arc the longitudinal and rotational drift velocities of ions have been measured, together with the electron and neutral densities and the temperatures of ions, electrons, and neutrals. The radial and longitudinal gradients of these quantities have been established. The ions drift against the electric field towards the anode with velocities between about 500 and 2500 m/s, driven by the plasma pressure gradient which is balanced by viscous deceleration and by friction against the surrounding neutral gas. The classical theory of the momentum balance with a turbulent contribution to the viscosity provides a good description of the longitudinal ion transport and explains direction and magnitude of the occurring drift velocity.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 26 (1987), S. 0 
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The CD4 molecule, which is known to play an important role in the susceptibility of T lymphocytes to infection by the human immunodeficiency virus (HIV), is also expressed in small amounts on the surface of monocytes. Since monocytes can also be infected by the virus, we investigated peripheral blood monocytes of patients with the acquired immunodeficiency syndrome (AIDS). AIDS-related complex (ARC), and HIV seropositive and seronegative haemophiliacs without symptoms for the expression of the CD4 molecule and for other functionally important surface molecules such as CD11 (C3bi receptor), transferrin receptor, Fc receptor, and the three major histocompatibility complex (MHC) class II antigens HLA-DP. HLA-DR, and HLA-DQ. With immunofluorescence staining and flow cytometry no difference was found between patients and controls for the expression of the CD4 molecule and for the other antigens as assessed by the percentage of positive staining and the specific fluorescence intensity in a double marker analysis. The percentage of CD4+ monocytes was found to be 59.2±14.4% for 16 patients with AIDS and 52.9±12.8% for 12 healthy controls. Similar to our results on phenotype, we found no significant difference with respect to the production of tumour necrosis factor (TNF), in that monocytes of AIDS and ARC patients showed an increase in TNF secretion after stimulation with LPS comparable to controls.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1437-3262
    Keywords: Key words Structural units ; Structure evolution ; Periadriatic Lineament ; Pannonian Basin ; Hungary ; Slovenia ; Croatia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Due to the political boundaries between the Central European countries, on one hand, and the thick Tertiary cover in the Pannonian Basin, on the other, the eastward continuation of the Alpine and Dinaridic units has been ambiguous and poorly documented. Based on comparative analyses, the aim of the present paper is to define the pre-Tertiary structural units in the junction area of the Alpine, Dinaridic, and Pannonian regions, in the SW part of the Pannonian Basin, and to draw conclusions on the continuation of the Alpine and Dinaridic units. According to diagnostic characteristics of the Periadriatic Lineament system, the Balaton Lineament system may be considered as its direct eastern continuation. North of the Periadriatic–Balaton Lineament system, the Transdanubian Range Unit, due to its pre-Tertiary paleogeographic setting, shows mainly South Alpine facies relations; however, its present structural position is identical to that of the Upper Austroalpine nappes. Between the Periadriatic–Balaton and Zagreb–Zemplin Lineament systems heterogeneous structural units are juxtaposed, forming the Sava Composite Unit. In the northern part of this composite unit non-metamorphosed nappes occur which can be considered the eastern continuation of the South Alpine units. These nappes are overthrust onto Internal Dinaridic units in the Tertiary. The Zagreb–Zemplin (Mid-Hungarian) Lineament separates the Sava Unit from the Tisza Unit showing close affinity to the Tethyan margin of the Eurasian plate during the early stage of the Alpine evolution.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 234 (1987), S. 55-58 
    ISSN: 1432-1459
    Keywords: Creutzfeld-Jakob disease ; Long duration ; EEG findings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case is reported of histopathologically verified Creutzfeldt-Jakob disease of long duration (more than 3 years) with some clinical peculiarities. The prominent peculiarity was a nearly normal EEG during repeated examinations, even in the terminal stage.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 242 (1987), S. 423-424 
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 245 (1989), S. 503-504 
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 245 (1989), S. 543-544 
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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