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  • Electronic Resource  (11)
  • 1985-1989  (6)
  • 1970-1974  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Cardiac arrhythmias modelled by Cai-inactivated Ca2+ channels (1989)
    Springer
    Biological cybernetics 61 (1989), S. 21-28 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract A model of cardiac cells incorporating the membrane potential and the intracellular calcium concentration as the two dynamical variables is developed. This model is applied to simple systems of cells to investigate its behavior as a function of the model parameters. Rational entrainment is observed in systems of two coupled pacemaker cells. The propagation of the membrane potential and intracellular calcium concentration through a sheet is simulated. Behavior suggestive of circus movement tachycardias is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204756
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Une transition métal–isolant dans V0,90Nb0,10O2 due à un appariement local des atomes de vanadium (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 55-60 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: X-ray diffuse scattering from V0.90Nb0.10O2 shows that the metal-to-insulator phase transition which occurs around - 25°C without an overall structural change can be explained by local pairing of the vanadium atoms. This local order, which recalls the low-temperature insulating structure of pure VO2, is two dimensional and occurs in the (110) planes of the average rutile structure with little correlation between successive parallel (110) atomic planes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947400009X
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Etude des phases haute température de NaNb3 et des correlations qui les caracterisent (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 423-430 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: From the study of X-ray diffuse scattering diagrams, it has been shown that the diffuse scattering located along three equivalent reciprocal rods (100) in the cubic phase disappears successively at 641, 575 and 520°C. The interpretation is given in terms of planar local order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739474000921
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Désordre linéaire dans les cristaux (cas du silicium, du quartz, et des pérovskites ferroélectriques) (1970)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 26 (1970), S. 244-254 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Many crystals produce a diffuse scattering of X-rays which is localized in a series of relplanes. It is shown that the corresponding linear disorder in the crystal may have various origins. In silicon, the scattering is due to thermal vibrations and is well explained by the elastic properties of the crystal. In neutron irradiated quartz the radiation damage is responsible for the major part of the scattering. The case of BaTiO3 and KNbO3 is discussed in detail. A linear disorder is proposed which accounts better for the different distributions of the scattering in the 4 allotropic phases than the alternative explanation of the soft mode. In spite of some neutron inelastic scattering results it is not yet possible to distinguish between static and dynamic disorder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947000061X
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  • 5
    Electronic Resource
    Electronic Resource
    X-ray diffuse scattering from NaNbO3 as a function of temperature (1971)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 27 (1971), S. 414-420 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A qualitative description of the X-ray diffuse scattering from NaNbO3 single crystals as a function of temperature up to 800°C is given. Two types of distinct diffuse scattering where observed in {100} reciprocal planes and on (100) reciprocal axes. While the diffuse scattering in reciprocal planes shows no critical behaviour at the different phase transitions and can be attributed to a `linear disorder' similar to that suggested earlier for KNbO3, the diffuse scattering on reciprocal axes is critical in the vicinity of the 641°C phase transition. The atomic displacements involved with the linear disorder that persists up to 800°C are attributed to the niobium atoms; the critical planar disorder in the cubic phase is attributed to rotations of oxygen octahedra similar to those suggested for SrTiO3 and KMnF3. Both types of disorder exist in the cubic paraelectric phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739471000950
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  • 6
    Electronic Resource
    Electronic Resource
    Nutrition and Nutritional Relationships of Pinus Radiata (1986)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 17 (1986), S. 325-350 
    Details
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.es.17.110186.001545
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Hemidiaphragmatic paralysis, an unusual presentation of Parsonage-Turner syndrome (1988)
    Springer
    Clinical rheumatology 7 (1988), S. 402-405 
    Details
    ISSN: 1434-9949
    Keywords: Parsonage-Turner Syndrome ; Hemidiaphragmatic Paralysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A previously healthy 38-year-old man presented a typical Parsonage-Turner syndrome (PTS) three weeks after a cold and unusual muscular exercise. In addition to the motor and sensory defects of the upper limbs, a right hemidiaphragmatic paralysis occurred, which proved to be reversible after several months. A brief review of the hemidiaphragmatic injury in PTS is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02239201
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  • 8
    Electronic Resource
    Electronic Resource
    Phosphatidylcholine synthesis in isolated type II pneumocytes from ozone-exposed rats (1988)
    Springer
    Archives of toxicology 61 (1988), S. 224-228 
    Details
    ISSN: 1432-0738
    Keywords: Ozone ; Phosphatidylcholine synthesis ; Alveolar type II cells ; Pulmonary surfactant ; Rat lung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Phosphatidylcholine (PC) synthesis by alveolar type II cells, as an indicator for the production of pulmonary surfactant, was studied after a 4-h exposure of rats to 4 mg ozone/m3 (2 ppm). Lung ravage fluid analysis after exposure revealed significant increases in proteins, which is indicative for pulmonary injury. When type II cells were isolated immediately and thereafter cultured for 20 h, the rate of PC synthesis in cells derived from ozone-exposed rats was not significantly different from that in cells from unexposed controls. Yet, a decreased rate of PC synthesis was observed when these cells were subsequently exposed to ozone in vitro. The activity of the enzyme glycerolphosphate acyltransferase (GPAT) was slightly enhanced in cultured type II cells isolated from ozone-exposed rats, while the lysophosphatidylcholine acyltransferase (LPCAT) activity was unchanged. However, ozone exposure of rats did result in a significant decrease of PC synthesis when measured in freshly prepared type II cell suspensions, although both GPAT and LPCAT activities were not affected. It is concluded that a decrease in pulmonary surfactant related PC synthesis after ozone exposure of rats can be demonstrated in freshly isolated type II pneumocytes. Cultured type II cells from exposed rats lack this effect and are therefore less useful to study changes in phospholipid biosynthesis after in vivo ozone exposure. The data on in vitro ozone exposure of cultured type II cells, however, support the view that ozone may impair pulmonary surfactant production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00316638
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  • 9
    Electronic Resource
    Electronic Resource
    De novo DNA microdeletion in a girl with Turner syndrome and Duchenne muscular dystrophy (1986)
    Springer
    Human genetics 〈Berlin〉 74 (1986), S. 193-196 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The single X chromosome of a girl with Turner syndrome 45,X and typical Duchenne muscular dystrophy was investigated at the chromosomal and DNA levels. No visible abnormality of the residual X chromosome was found upon high-resolution R-banding. The DNA was analysed by Southern blotting and hybridization with seven cloned probes mapping in the Xp21 region where the Duchenne locus is thought to be located. A molecular deletion was detected with probes pERT 87.1, pERT 87.8, and pERT 87.15. The other probes (754, C7, 99.6, and RC8) gave a normal signal. The DNA alleles seen in the two parents indicated that the deletion found in the propositus had occurred de novo on a maternal X chromosome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282093
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  • 10
    Electronic Resource
    Electronic Resource
    Deletion proximal to DXS68 locus (L1 probe site) in a boy with Duchenne muscular dystrophy, glycerol kinase deficiency, and adrenal hypoplasia (1988)
    Springer
    Human genetics 〈Berlin〉 78 (1988), S. 222-227 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary We report a case of a boy with Duchenne muscular dystrophy (DMD) associated with GK deficiency (GK), congenital adrenal hypoplasia (AHC), and mental retardation. Cytogenetic analysis of prometaphasic chromosomes revealed an interstitial chromosome deletion at Xp21.2 possibly extending to Xp21.1 or Xp21.3. His phenotypically normal mother was heterozygous for this deletion. DNA probe analysis on Southern blots showed that the deletion affected the following probe sites: 754, pERT 84, 21A, XJ2.3, pERT 87, JBir, and J66-H1, whereas L1, C7, and CX5.4 probes gave a normal signal. Pulse field gel electrophoresis after SfiI digestion did not show abnormal fragments with L1. These data are consistent with a deletion of about 4 megabases and indicate that the GK and AHC loci are proximal to L1 and distal to J66-H1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00291665
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