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  • 1995-1999
  • 1990-1994  (3)
  • 1992  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Colloid cysts of the third ventricle: an immunohistochemical study (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 21 (1992), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Eleven colloid cysts of the third ventricle were investigated by immunohistochemistry using 16 mono- and polyclonal antibodies. Colloid cyst epithelium, choroid plexus epithelium and ependyma showed different immunohistochemical profiles. In particular, antibodies to different cytokeratins and to transthyretin revealed considerable and constant differences of immunoreactivity. Therefore, common derivation of the three tissues seems unlikely. Our findings are interpreted in favour of the non-neuroepithelial origin of third ventricular colloid cysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2559.1992.tb00340.x
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  • 2
    Electronic Resource
    Electronic Resource
    Sulfhydryl oxidase immunoreactivity in seminiferous tubules of infertile men (1992)
    Springer
    Cell & tissue research 267 (1992), S. 209-214 
    Details
    ISSN: 1432-0878
    Keywords: Testis ; Sulfhydryl oxidase ; Hypospermatogenesis ; Sertoli cell integrity ; Immunocytochemistry ; Man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Sulfhydryl oxidase (SOx) immunoreactivity was investigated in the seminiferous epithelium of human biopsy material from the testes of 33 adult men with disturbed fertility. SOx immunoreactivity was expressed in normal seminiferous epithelium in type-A spermatogonia (27±4% of all spermatogonia) (n=4), in spermatocytes and round spermatids. Mature spermatozoa as well as Sertoli cells were unlabelled. within the interstitium, Leydig cells were immunopositive. In biopsies of oligozoospermic men showing hypospermatogenesis (n=24), an increase in labelled spermatogonia up to more than 90% was observed in biopsies, where seminiferous epithelia revealed only spermatogonia and Sertoli cells. Within the group of oligozoospermic patients there was a significant increase of labelled spermatogonia from 43±13% (〉20 mill/ejaculate) (n=7) to 55±16% ( 20 and 〉20 mill/ejaculate) (n=6) to 68±8% (〈5 mill/ejaculate) (n=11) and a significant (P=0.01) decrease of score count from 7.0±2.7 to 2.0±1.8. In this group the increase of labelled spermatogonia was correlated with sperm concentrations in the ajaculate (correlation coefficient: r=-0.6). In biopsies of azoospermic patients showing maturation arrest at the level of spermatocytes or spermatids (n=5) the percentage of labelled spermatogonia was within the range of 24% to 59%. Immunoreactivity in Sertoli cells was only found in single degenerating cells and in tubules showing Sertoli Cell Only Syndrome (SCO) without lumen formation. Sertoli cells within immature seminiferous cords were immunonegative, indicating that Sertoli cell SOx immunoreactivity is rather a sign of physiological alterations in degenerating cells than dependent on the stage of differentiation. Leydig cells did not show changes of immunoreactivity in any biopsy. It is concluded that SOx expression in spermatogonia may serve as a marker for spermatogenic efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302957
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Polyesters with 1.4:3.6-dianhydrosorbitol as polymeric plasticizers for PVCDedicated to Professor Dr. W. Heitz on the accasion of his 60th birthday (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 199 (1992), S. 191-205 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Gesättigte aliphatische Polyester mit dem aus Stärke erhältlichen 1.4:3.6-Dianhydrosorbit wurden mit PVC gemischt. Die mechanischen Eigenschaften dieser Mischungen wurden mittels Differentialkalorimetrie, Spannungs-Dehnungs-Experimenten und Torsionspendelmessungen untersucht. Polyester mit mehr als vier Methylengruppen in der Säurekomponente sind mit PVC mischbar. Mischungen aus PVC und Poly(1.4:3.6-dianhydrosorbitadipat) sind dagegen unverträglich; sie zeigen für jedes Mischungsverhältnis zwei Glastemperaturen, die bei denen der Reinkomponenten liegen.
    Notes: Saturated aliphatic polyesters with 1.4:3.6-dianhydrosorbitol units were mixed with poly(vinylchloride) (PVC). The mechanical properties of these mixtures were examined by differential scanning calorimetry, stress-strain experiments, and torsion pendulum measurements. Polyesters containing more than four methylene groups in the acid component are compatible with PVC. These polyesters can serve as plasticizers for PVC. On the contrary, mixtures of PVC with poly(1.4:3.6-dianhydrosorbitol adipate) are incompatible; in this case, at any blend composition, the two glass transition temperatures of the pure components are observed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051990115
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