Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 381 (1979), S. 269-281 
    ISSN: 1432-2307
    Keywords: Testis ; Testicular biopsies ; Arteriolar hyalinosis ; Morphology ; Frequency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das häufige Vorkommen arteriolärer Hyalinosen in Hoden verstorbener Patienten ist bekannt. Gleiche Gefäßveränderungen können auch in Hodenbiopsien und operativ entfernten Hoden gefunden werden. Um uns ein Bild über die Häufigkeit machen zu können, untersuchten wir eine Serie von 2400 Hodenbiopsien und einzelnen operativ entfernten Hoden systematisch lichtmikroskopisch, teils auch histochemisch und elektronenoptisch im Hinblick auf arterioläre Hyalinosen. Dabei konnten in 3,75% der Patienten typische Herde nachgewiesen werden (Durchschnittsalter 34 Jahre). An Hodengrundkrankheiten findet man vor allem tubuläre Atrophien (58%) oder Kryptorchismus (22% der Fälle mit Gefäß Veränderungen). Die histochemischen Reaktionen lassen vermuten, daß der Hauptteil der eingelagerten Substanz aus Lipoiden, besonders Lecithinen besteht. Daneben sind auch Mukopolysaccharide abgelagert. Elektronenoptisch handelt es sich vorwiegend um fein granuläre Depots mit Vakuolen und seltenen Myelinfiguren. In späteren Stadien ist subendothelial ferner elastinartiges Material zu sehen, an der Peripherie der Herde sind Kollagenfasern nachweisbar. Die pathogenetische Bedeutung dieser arteriolären Hyalinoseherde und ihre Ursache sind unklar.
    Notes: Summary Arteriolar hyalinosis is a common post mortem finding in the testes of even young men. Identical arteriolar hyalinoses can be demonstrated in testicular biopsies of patients with infertility or in patients operated on for cryptorchidism. In a series of such biopsies from 2400 patients, the frequency of arteriolar hyalinosis was examined. In 7 cases with positive findings, histochemical studies were carried out and in an additional 14 biopsies electron microscopy was performed. Arteriolar hyalinosis was found in 3.75% of the 2,400 patients with disturbances of fertility or cryptorchidism. The mean age of these patients was 34 years. In 58% of the cases with arteriolar hyalinosis the basic testicular lesion was tubular atrophy, in 22% cryptorchidism. The arteriolar lesions were due to deposits of lipoids and mucopolysaccharides. Electron microscopy revealed a granular material with vacuoles and rarely myelin bodies below the endothelial layer and between myocytes and fibrocytes of the arteriolar wall. In later stages elastin-like material could be demonstrated in the vicinity of the endothelial cells and collagen fibers at the periphery of these deposits. The etiology of testicular arteriolar hyalinosis and its pathogenetic significance are not yet clear.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-2242
    Keywords: Key words CpDNA polymorphism ; Heteroplasmy ; psbA gene ; Triazine resistance ; Senecio vulgaris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The weed Senecio vulgaris acquired high levels of resistance to triazine herbicides soon after the latter’s introduction. As in most weeds, triazine resistance is conferred by a point mutation in the chloroplast psbA gene that negatively affects the fitness of its carrier. To assess levels of triazine resistance in S. vulgaris field populations, we adopted a PCR-RFLP-based molecular diagnostic test recently developed for the triazine resistance-conferring region of the psbA gene of other weeds, including Brassica napus, Chenopodium spp. and Amaranthus spp., and compared these molecular results to the phenotypic response after triazine application. A highly significant linear correlation was found between phytotoxic symptoms and biomass reduction. Variability in phenotypic response was not only found between populations or inbred lines of S. vulgaris but also within replicates of the same inbred line. No clear relationship, however, was found between the DNA restriction pattern and the phenotypic response to triazine application, thereby throwing doubt on the use of such molecular diagnostic tests to track triazine resistance in S. vulgaris. Our results indicate that the chloroplast genome of S. vulgaris is polymorphic and that the level of polymorphism may be variable within single leaves of individual plants. We discuss the possible genetic basis of this polymorphism and its consequence for the acquisition and inheritance of chloroplast-based traits.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...