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  • 1
    Digitale Medien
    Digitale Medien
    Non-essential Role of the Adrenal Medulla in the Hibernation of the 13-Lined Ground Squirrel (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 656-657 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The work recorded here was initiated to obtain more information on the influence of the adrenal medullary hormones in hibernation and arousal during an entire hibernating season. Six male 13-lined ground squirrels (C. tridecemlineatus) were bilaterally adrenalectomized in July, but a remnant of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/207656a0
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  • 2
    Digitale Medien
    Digitale Medien
    Coupling of Ni and NiFe films through an intervening nonmagnetic film (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4451-4453 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The magnetic coupling of 20-nm-thick Ni and Ni78Fe22 films through intervening Ag film has been investigated by ferromagnetic resonance (FMR) at 33 GHz. Films were deposited by e-beam evaporation on glass in the order glass/Ag/Ni/Ag/NiFe/Ag. The Ag over- and underlays were 20 nm thick; the central Ag-film thickness was varied between 0 and 20 nm. The coupling of the two ferromagnetic films, A and B, through the interface is modeled by adding −KMA⋅MB to the free energy per unit area. The FMR-mode positions are found from the solutions of a quadratic in K. Subsequently, FMR-mode intensities and linewidths are computed. Input data for these calculations were obtained from observations made on uncoupled Ni and NiFe films. From in-plane dc-field date a variation of K was deduced with a coupling film thickness t of the form exp(−t/τ) with τ equal to 2.68 nm. Limited FMR data taken with the dc field normal to the specimen are consistent with a weak coupling, K∼t−0.83. Little coupling was found in a glass/SiO2/Ni/SiO2/NiFe/SiO2 sequence with the SiO2 films spanning the same thickness range as the Ag in the first sequence. It is believed that the coupling in Ni/Ag/NiFe is dominated by conduction-electron-spin polarization. Some of the coupling may be magnetostatic in origin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.344901
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  • 3
    Digitale Medien
    Digitale Medien
    Wide range magnetic electron spectrograph (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1233-1238 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: An electron spectrograph is described that covers electron energies from 400 eV to 200 keV with an energy resolution of 10%. This overlaps the range of electrostatic deflection devices at low energy and solid state detectors at high energy. The spectrograph uses magnetic deflection of the electrons to achieve energy separation and images the full range of energies on a single plane. The magnetic circuit uses the fringing field of two axially located magnets to attain the large energy range. Six separate electron beams can be dispersed in the field, each entering the circuit from a different angle. This is a particular advantage when measuring plasma electron three-dimensional velocity distributions. The angular response of the instrument is particularly favorable and the stray magnetic field is sufficiently low to meet spacecraft requirements. Compared with electrostatic deflection devices, the spectrograph is particularly advantageous for measuring high energy electron plasma velocity distribution functions with fast time resolution at modest energy resolution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1140296
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  • 4
    Digitale Medien
    Digitale Medien
    FMR in evaporated single and multilayer thin Fe films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5760-5762 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have used ferromagnetic resonance (FMR) at 33 GHz to study the properties of a number of evaporated thin Fe film systems. Values for effective anisotropy field HKeff , g value, and exchange constant A were derived. For Fe on glass, ||HKeff || was found to increase with increasing thickness. These changes were attributed to stress which decreased with film thickness. The presence of a Cu or a Ti underlayer did not seem to affect HKeff for films grown at room temperature. However, Fe/Ti/glass films made at higher substrate temperatures, Ts, did show an increase in ||HKeff ||. The appearance of a spin-wave mode in the Fe films enables us to compute the exchange constant A for Fe, A=(2.12±0.14)×10−6 ergs cm−1. The coupling between two thin Fe films through an intervening Cu layer was investigated. A model predicting the number and position of the peaks in the spectrum as a function of coupling is presented. From experiment it was observed that the coupling remains almost constant through the 50–5-nm Cu thickness range but rises sharply at 2-nm Cu thickness.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.342250
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  • 5
    Digitale Medien
    Digitale Medien
    Epitaxial growth of LaF3 on GaAs(111) (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 273-275 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report the first epitaxial growth of lanthanum trifluoride on the (111) surface of gallium arsenide. Smooth, crack-free, and high-crystalline quality films of thickness up to 200 nm were grown at 500 °C on a GaAs(111) surface that was cleaned by ion heat treatment and post-anneal. The film surfaces were examined in situ by low-energy electron diffraction (LEED) and ex situ by reflection high-energy electron diffraction (RHEED) and Nomarski optical microscopy. Capacitance-voltage (C-V) and current-voltage (I-V) measurements showed a breakdown strength of 2×106 V/cm and no significant flat-band shift due to insulator charges.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.336825
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  • 6
    Digitale Medien
    Digitale Medien
    A surgical operating apparatus for fish and its use in the pinealectomy of salmonids (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 10 (1977), S. 0 
    Details
    ISSN: 1095-8649
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: A surgical operating apparatus for fish that is effective for cranial surgery is described. The fishes are secured with clamp-arms which extend against the pectoral and pelvic girdles. The head is held by a plexiglass mouthpiece, designed specifically for the fish species under investigation. The mouthpiece is also responsible for gill irrigation. The use of the apparatus for the surgical pinealectomy of salmonids is described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1095-8649.1977.tb05133.x
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  • 7
    Digitale Medien
    Digitale Medien
    Hypoxic inactivation of cold-induced brown fat thermogenesis (1972)
    Springer
    Cellular and molecular life sciences 28 (1972), S. 1172-1173 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Résumé Chez des rats adaptés au froid, non anesthésiés, placés brièvement dans une atmosphère de 12% d'oxygène, on observer un arrêt immédiat de la thermogénèse de la graisse brune. Cet effet semble s'expliquer par l'absence d'activation par le système sympathique. L'absence d'une réaction de thermogénèse en réponse à une injection de noradrénaline chez des rats soumins au froid et dans des conditions hypoxiques plaide en faveur de cette explication.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01946150
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  • 8
    Digitale Medien
    Digitale Medien
    Observations of inverted-V electron precipitation (1982)
    Springer
    Space science reviews 33 (1982), S. 415-457 
    Details
    ISSN: 1572-9672
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The characteristics of inverted-V electron precipitation fluxes deduced predominantly from observations by the Atmosphere Explorer satellites are reviewed. The energy and pitch angle distributions are presented and shown to be generally in agreement with acceleration by a parallel electrostatic potential. Characteristics of secondary electrons are examined, and effects of beam plasma instabilities on these electrons are discussed. The properties of the monoenergetic component are compared with theoretical models of creating parallel DC electric fields, and found to favor the anomalous resistivity model. The article also discusses relations of inverted-V events with other auroral phenomena including auroras, electrostatic shocks, convective electric field reversals, field-aligned currents and wave emissions. The principal conclusions are: (1) plasma sheet electrons are continuously accelerated to form inverted-V structures in the pre-midnight hemisphere independent of substorm phase, (2) the acceleration processes are probably related to large scale electrostatic wave turbulence observed at altitudes of a few thousand kilometers, (3) narrow bursts of intense electron precipitation fluxes are found to be imbedded within some inverted-V's. It is argued that the narrow bursts of intense electron precipitation have the proper characteristics to cause discrete auroral arcs in the atmosphere. We suggest that these narrow bursts are accelerated by an electrostatic shock at higher altitude and capable of producing discrete auroral arcs below the observing satellite.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00212420
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  • 9
    Digitale Medien
    Digitale Medien
    Possible particle measurements in the high-latitude magnetosphere (1967)
    Springer
    Space science reviews 7 (1967), S. 302-313 
    Details
    ISSN: 1572-9672
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00215605
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  • 10
    Digitale Medien
    Digitale Medien
    Interaction of harderian glands, illumination, and temperature on thyroid hormones in golden hamsters (1989)
    Springer
    Journal of comparative physiology 158 (1989), S. 697-702 
    Details
    ISSN: 1432-136X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary In this study, Harderianectomy (Hdx) has been shown to differentially modify circulating levels of the thyroid hormones, T4 and T3, in male and female golden hamsters exposed to low photic intensities or to moderately low temperatures. Specifically, low photic intensities depress circulating levels of T4 in both control and Harderianectomized (Hdx) male and female hamsters. In addition, T3 is decreased in both control and Hdx males but not in females, as a consequence of reduced levels of illumination. Moderately low temperatures (10°C) depress T4 in both control and Hdx males but not in females, while T3 is increased in both control male and female hamsters, and in Hdx males, but not Hdx females. The data suggest that the Harderian gland of males enhances the sensitivity of the TSH-thyroid axis to photic intensity and to lower temperatures, and further, that there is a considerable sexual difference in the role the Harderian glands may play in response to these two environmental factors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00693007
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