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  • 74.60.Ge  (2)
  • Electron microscopic immunocytochemistry  (2)
  • Springer  (4)
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  • Springer  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Extension of the 3D-scaling rule for resistivity as a function of magnetic field and its orientation for anisotropic high-temperature superconductors (1994)
    Springer
    Applied physics 59 (1994), S. 583-587 
    Details
    ISSN: 1432-0630
    Keywords: 74.60.Ge ; 74.25.Fy ; 74.20.De
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The measurement of the c-axis resistivity of single crystalline La1.86Sr0.14CuO4 is performed at different constant temperatures as a function of magnetic field H and angle θ between H and the ab-plane. It is shown that the 2D- or 3D-scaling rule proposed for high-T c superconductors does not work well for the present system. Taking into account unusual vortex dynamics in the high-T c systems, an extension is made to the 3D-scaling rule developed on the basis of the effective-mass model. Based on this extended rule, it is shown that at each given temperature the observed resistivity as a function of H and θ could be consistently scaled onto the corresponding Lorentz-force-free magnetoresistivity curves directly measured in H‖I‖c.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331916
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  • 2
    Electronic Resource
    Electronic Resource
    A scaling for thec-axis resistivity of La1.86Sr0.14CuO4 as a function of temperature, field and field orientation (1996)
    Springer
    Applied physics 62 (1996), S. 73-76 
    Details
    ISSN: 1432-0630
    Keywords: 74.60.Ge ; 74.25.Fy ; 74.20.De
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The c-axis resistivity,ϱ c (T, H, θ), of La1.86Sr0.14CuO4 is experimentally studied as a function of temperatureT, magnetic fieldH and angleθ betweenH andab-plane. It is argued that the experimental findings cannot be accounted for by previously considered mechanisms. By contrast; they can be explained by a phenomenological model, which is developed by replacingH in the dissipation model forH‖I‖c with the reduced fieldh = H (sin2 θ + cos2θ/γ2 1/2, where γ is the anisotropic parameter in magnetic fields. Based on this phenomenological model, it is shown that all the measuredϱ c (T, H, θ) curves could consistently map onto a single curve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01568090
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructural localization of immunoreactive corticotropin, β-lipotropin, α- and β-endorphin in Cells of the human fetal anterior pituitary (1979)
    Springer
    Cell & tissue research 204 (1979), S. 37-51 
    Details
    ISSN: 1432-0878
    Keywords: Corticotropin ; Opioid peptides ; Anterior pituitary ; Human fetus ; Electron microscopic immunocytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Cells immunoreactive with anti-α-(17–39) ACTH, β-(1–24) corticotropin, β-LPH, α- and β-EP were identified in the human fetal anterior pituitary at the ultrastructural level using the peroxidase-antiperoxidase complex method on ultrathin sections. Only one definite cell type was revealed by all these antisera. All granules of each individual immunostained cell reacted regardless of the antiserum used. The immunostained cells occurred in groups and were sometimes located in the wall of the follicle-like structures commonly observed in the fetal anterior pituitary. The cells revealed two main aspects: 1) The largest elements were rich in organelles, and their numerous secretory granules showed significant variations in size (250–500 nm in diameter), electron density of their content and stain-deposit intensity. The ergastoplasm, consisting of irregular tubules, was poorly developed. In the vicinity of the conspicuous Golgi apparatus, organelles related to the GERL complex were commonly observed. Multivesicular bodies were frequent. Some of these cells showed bundles of microfilaments (60 nm in thickness). 2) The smaller cells had an electron-lucent hyaloplasm with sparse organelles; they contained fewer granules and never showed microfilaments. The immunocytological results are consistent with the synthesis of a molecule similar to pro-opiocortin by this type of endocrine cell in human fetuses. Morphological evidence for the maturation process of this precursor and for the secretory activity of these cells and its possible regulation is presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235163
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  • 4
    Electronic Resource
    Electronic Resource
    Somatotrophs in the human fetal anterior pituitary (1977)
    Springer
    Cell & tissue research 181 (1977), S. 545-552 
    Details
    ISSN: 1432-0878
    Keywords: Somatotrophs ; Anterior pituitary ; Human fetus ; Electron microscopic immunocytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An immunocytochemical staining of ultrathin sections using the peroxidase-antiperoxidase complex was employed to localize the somatotrophs in the anterior pituitary of the human fetus. This technique allowed a specific identification of the somatotrophs and a detailed description of their ultrastructure which was well preserved by the fixation employed. They appeared as cells with a dense cytoplasmic matrix, lamellar rough endoplasmic reticulum, and prominent Golgi apparatus. Their secretory granules had a mean diameter of 300 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221775
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