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  • 1
    Electronic Resource
    Electronic Resource
    The solar-wind driven magnetosphere–ionosphere as a complex dynamical system (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 4178-4184 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The solar-wind driven magnetosphere–ionosphere system is a classic example of a complex dynamical system (CDS). The defining properties of a CDS are (1) sensitivity to initial conditions; (2) multiple space-time scales; (3) bifurcation sequences with hysteresis in transitions between attractors; and (4) noncompositionality. Noncompositionality means that the behavior of the system as a whole is different from the dynamics of its subcomponents taken with passive or no couplings. In particular the dynamics of the geomagnetic tail plasma depends on its coupling to the dissipative ionospheric plasma and on the nature of the solar-wind driving electric field over a suitably long (many hours) previous time interval. These complex dynamical system features are shown here in detail using the known WINDMI model for the solar-wind driven magnetosphere–ionosphere (MI) system. Numerous features in the bifurcation sequence are identified with known substorm and storm characteristics. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873683
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  • 2
    Electronic Resource
    Electronic Resource
    Chaos and the limits of predictability for the solar-wind-driven magnetosphere–ionosphere system (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 2946-2952 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The solar-wind-driven magnetosphere–ionosphere exhibits a variety of dynamical states including low-level steady plasma convection, episodic releases of geotail stored plasma energy into the ionospheric known broadly as substorms, and states of continuous strong unloading. The WINDMI model [J. P. Smith et al., J. Geophys. Res. 105, 12 983 (2000)] is a six-dimensional substorm model that uses a set of ordinary differential equations to describe the energy flow through the solar wind–magnetosphere–ionosphere system. This model has six major energy components, with conservation of energy and charge described by the coupling coefficients. The six-dimensional model is investigated by introducing reductions to derive a new minimal three-dimensional model for deterministic chaos. The reduced model is of the class of chaotic equations studied earlier [J. C. Sprott, Am. J. Phys. 68, 758 (2000)]. The bifurcation diagram remains similar, and the limited prediction time, which is in the range of three to five hours, occurs in the chaotic regime for both models. Determining all three Lyapunov exponents for the three-dimensional model allows one to determine the dimension of the chaotic attractor for the system. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1371522
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  • 3
    Electronic Resource
    Electronic Resource
    Epidemiology of Toxoplasma gondii in Farm Ecosystems (1996)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 43 (1996), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1996.tb05040.x
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  • 4
    Electronic Resource
    Electronic Resource
    Laser pointing stabilization and control in the submicroradian regime with neural networks (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 1339-1342 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The possibility of controling the pointing stability of a slowly pulsed Ti:Sapphire laser system by lowpass filters and artificial neural networks (NN) is investigated by performing time series analysis and computer simulations on experimentally measured datasets. The simulations show that at pulse repetition rates of 20 Hz it is possible to use a feedforward algorithm to reduce the angular standard deviation from 0.7 to 0.3 μrad. The properties and advantages of NN methods such as automatic adaptation characteristics of a time series are discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1334624
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  • 5
    Electronic Resource
    Electronic Resource
    Specific Localization of the Gap Junctional Protein Connexin 32 in Equine Gastric Mucosa (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Anatomia, histologia, embryologia 34 (2005), S. 0 
    Details
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Gap junctional inter-cellular communication (GJIC) is known to be important in the maintenance of tissue homeostasis. Evidence is accumulating that GJIC plays an important role in the gastric mucosal defence system and that the loss of GJIC is associated with gastric ulcer formation. The prevalence of gastric ulceration in foals and horses is high. However, there are no studies about the presence of gap junctions in gastric mucosa of horses. The purpose of this study was to investigate the distribution pattern of the gap junction protein 32 in normal gastric mucosa of horses. Immunocytochemical observations were made with light microscopy on cryosections of fresh frozen gastric mucosa from the fundic region, pyloric region, margo plicatus and pars nonglandularis. Immunohistochemical staining was performed by standard immunoperoxidase techniques using an anti-connexin 32 polyclonal antibody. In Situ Hybridization, Western Blot Analysis and RT-PCR were performed to confirm the presence of connexin 32. In normal horse gastric mucosa, connexin 32 was abundant in the surface epithelium and in a decreasing staining gradient extending down to the neck of the glands. Gastric surface mucous cells are formed in the neck of the glands and migrate along the foveola toward the mucosal surface. So, immature forms of surface mucous cells are found in the generative zone and in the deep part of the foveola, whereas well-matured ones cover the upper part of the foveola and the luminal surface of the mucosa. Therefore, these findings are in line with other studies, which described larger and more numerous gap junctions in mature surface mucous cells than in immature cells. These results show that gap junctions develop during the maturation of surface mucous cells and suggest that GJIC between gastric surface mucous cells plays an important role in the regulation of cell differentiation and in tissue homeostasis. Further studies are required to investigate the distribution pattern of connexin 32 in the gastric mucosa of horses with gastric ulcer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0264.2005.00669_33.x
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  • 6
    Electronic Resource
    Electronic Resource
    Angular distributions of neutron polarization from the ^1^4C(p, n)^1^4N and ^1^1B(α, n)^1^4N reactions and R-matrix analysis oF ^1^5N in the excitation-energy range between 11.5 and 12.5 MeV
    Amsterdam : Elsevier
    Nuclear Physics, Section A 289 (1977), S. 408-424 
    Details
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(77)90043-4
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  • 7
    Electronic Resource
    Electronic Resource
    The CAMINO Intracranial Pressure Device in Clinical Practice: Reliability, Handling Characteristics and Complications (1998)
    Springer
    Acta neurochirurgica 140 (1998), S. 1113-1120 
    Details
    ISSN: 0942-0940
    Keywords: Keywords: Fiberoptic device; intracranial pressure; complications; reliability.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary  Intracranial pressure monitoring has a key role in the management of patients developing increased intracranial pressure (ICP). We adopted the Camino fiberoptic system for intracranial pressure measurement in 1993 in our neurosurgical department. The aim of this study was to investigate reliability, handling characteristics and complication rate of the Camino intracranial pressure device.  In an eighteen month period, we prospectively investigated 118 patients with intracranial pathology undergoing Camino fiberoptic intraparenchymal or intraventricular ICP monitoring. The assessment of reliability of ICP monitoring according to patients clinical condition, to cranial computed tomography (CCT) findings and ICP waveform was carried out. Position of the probe and intracranial bleeding complications related to probe insertion were confirmed by CCT. Technical complications, as well as infections due to the device, were documented. In vivo recalibration was performed in 22 patients. At the end of the measuring period the drift of the probe was evaluated and the accuracy of the fiberoptic device was measured by performing a two point calibration.  Recordings of intracranial pressure were carried out with 136 Camino devices (104 parenchymal, 32 ventricular) in 118 patients with an average measuring time of 94.1±79.1 hrs. One hundred and fifteen Camino intracranial pressure devices (85.2%) demonstrated reliability according to the predetermined clinical parameters. The actual mean drift after removal of the devices was 3.4 mmHg±3.2 with an actual daily drift of 3.2±17.2 mmHg. Recorded complications included infection (0.7%), intraparenchymal haematoma (5.1%), and a high complication rate (23.5%) with regard to technical aspects. The Camino intracranial pressure system offers reliable ICP measurements in an acceptable percentage of devices, and the advantage of in vivo recalibration. The high incidence of technical complications identifies a need for improvement in the fiberoptic cable and the fixation system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007010050224
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of negatively charged aerosol on blood and cerebrospinal fluid parameters in rats (1983)
    Springer
    International journal of biometeorology 27 (1983), S. 259-269 
    Details
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract Adult male rats were exposed for 90 to 140 minutes to negatively charged tapwater aerosol. Blood and cerebrospinal fluid samples were collected to determine effects of the exposure on selected hematologic and serum chemistry parameters, and ionized calcium and pH in cerebrospinal fluid. Of the 27 variables assayed, 24 yielded sufficient data for statistical analysis. Two parameters, serum alkaline phosphatase and mean corpuscular hemoglobin concentration, were significantly different (p〈0.05) from control values, probably representing chance occurrences. It appears that whatever biological effects may be exerted by electro-aerosols, they are not mediated by the parameters investigated in this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02184241
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  • 9
    Electronic Resource
    Electronic Resource
    Mitochondrial DMA variation in plants regenerated from embryogenic callus cultures of CMS triticale (1995)
    Springer
    Theoretical and applied genetics 91 (1995), S. 1237-1241 
    Details
    ISSN: 1432-2242
    Keywords: Mitochondrial DNA ; Somaclonal variation ; Cytoplasmic male sterility ; Triticum timopheevi cytoplasm ; Triticale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The mitochondrial DNA (mtDNA) organization of primary hexaploid cytoplasmic male-sterile (CMS) triticale regenerants containing Triticum timopheevi cytoplasm was analysed by hybridization experiments and compared with the mitochondrial genome organization of the corresponding regenerants with maintainer cytoplasm. Callus cultures had been derived from immature embryos, and 623 triticale plants were regenerated via somatic embryogenesis after three to four subcultures. The chondriome of 159 regenerants was investigated with regard to somaclonal variation. Six different mitochondrial gene probes and four different restriction enzymes were used for Southern blot analyses by the non-radioactive digoxigenin labeling technique. Alloplasmic regenerants showed a gain or loss of hybridization signals up to a high percentage, while euplasmic ones revealed only minor variability with respect to band stoichiometries. In 24 cases rearrangements in the mtDNA were proved. We suppose that recombination processes and selective amplification events are responsible for these findings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220934
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  • 10
    Electronic Resource
    Electronic Resource
    Stimulation of cutaneous mechanoreceptors by 60-Hz electric fields (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 8 (1987), S. 337-350 
    Details
    ISSN: 0197-8462
    Keywords: hair vibration ; extremely low frequencies ; chronic stimulation ; exposure system ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Chronic exposure of animals to 60-Hz electric fields is known to affect the nervous system in a variety of subtle ways. The mechanism whereby these effects are produced remains unknown. One hypothesis is that the effects are a result of direct interaction between neuronal membranes and induced currents. Alternatively, the effects could be produced indirectly, as a result of sensory stimulation and the resulting low-level stress. To test these hypotheses, a system was developed to expose the surface of an anesthetized cat's paw to surface electric fields up to 600 kV/m while simultaneously measuring, in dorsal root fibers, afferent nerve impulses originating from various receptor types in the exposed paw. Of the 245 receptor units tested, comprising ten cutaneous receptor types, ten responded to the electric field with an increase in firing rate. The most sensitive receptor type was the rapidly adapting field receptor (RAF); eight of 20 (40%) were sensitive to the electric field, with thresholds as low as 160 kV/m. One of 35 rapidly adapting high-frequency receptors and one of 22 type T hair-follicle receptors were also sensitive to the electric field. Follow-up tests on the RAF receptors showed that hair removal reduced but did not eliminate the electric field sensitivity, suggesting that at least one other mechanism was involved in addition to stimulation via hair movement. The most likely mechanism is field-induced vibrations of the skin, since a further reduction in firing rate occurred following application of mineral oil to the depilated paw. Direct interaction with neuronal membranes is not supported by our evidence.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bem.2250080403
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