Bibliothek

feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • 2000-2004  (2)
  • 1970-1974  (1)
  • 1905-1909  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Archives of orthopaedic and trauma surgery 120 (2000), S. 160-165 
    ISSN: 1434-3916
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Incomplete bone contact with threaded acetabular components is usually attributable to the tapered thread design and sclerotic bone, and might be the reason for early loosening. The self-tapping flat threads of the Hofer-Imhof cup allow accurate insertion without incarceration, even in sclerotic bone. To demonstrate the effectiveness of this threaded cup design based on digitized measurements of bone contact area, six Hofer-Imhof cups were implanted into three human cadavers. The bone contact area at the threads was digitally analyzed on cadaver-explanted cups cut into horizontal and coronal sections. In cups fixed with ideal form fit, bone contact was 31.6% (range 8–55%) at the threads and 28.5% (range 0–49%) between the threads on average. In cups with incomplete bone contact secondary to insufficient reaming, the bone contact area averaged 27.4% (range 10–44%) at the threads. In sclerotic bone, the highest bone contact at the threads was 69%. The threads were the first part of the cup to achieve primary bone contact. Factors contributing to poor contact were incomplete reaming, sections which passed through the incisura of the acetabulum, and incomplete contact with the medial aspect of the acetabulum. The aim was to achieve complete bone contact. Because of the higher contact areas observed in sclerotic bone, some sclerotic bone should remain after reaming.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 153 (1974), S. 435-448 
    ISSN: 1432-0878
    Schlagwort(e): Brain vessels ; Perivascular space ; Connective tissue ; Blood-brain-barrier ; Lepidosteus (Ganoidei) ; Teleosts
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Blood vessels surrounded by unusually wide perivascular spaces rich in connective tissue were observed in the brain of Lepidosteus (Ganoidei). Connective-tissue sheaths measuring up to 13 μm in width enclose arterioles and venules (40–70 μm in diameter), and even capillaries may be encompassed by a cuff formed by collagen fibers. Blood vessels with wide perivascular spaces are mainly located in the subependymal layer of the lateral ventricles, near the mesencephalic aqueduct and in the folded basal lining of the fourth ventricle. At the light-microscopic level these vessels do not show any distinct contact with nervous elements (axons). Some other brain regions of Lepidosteus, e.g. mesencephalic tectum, are supplied by a conventional type of capillaries, free of connective-tissue linings. For comparative reasons, brains of several selachian and teleostean species were examined with comparable histological methods. Distinct perivascular spaces were found in the pike, in the trout and in the eel. They are considerably richer in connective tissue than the occasionally observed narrow perivascular spaces in the shark. The significance of the abundant perivascular connective tissue in the brain of Lepidosteus is open to discussion; structural and functional problems of the brain-blood-barrier have been reviewed in this context. The brain of Lepidosteus appears to be a very suitable model for studies of blood supply, vascular ultrastructure and blood-brain-barrier functions.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    ISSN: 1435-9456
    Schlagwort(e): Key words Communication ; Individual signature ; Recognition ; Social behaviour ; Bats
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The remarkable cognitive abilities of bats indicate that they may recognise particular conspecifics. Because of their highly developed auditory system, it is obvious that vocalisations of bats may give information about the individual emitting them. In a field study of the social behaviour in the Indian false vampire bat (Megaderma lyra), two different types of vocalisation were recorded and analysed. The bats emitted these vocalisations only while aggregating with conspecifics inside the day roost. The “landing strophe” consisted of a number of brief multiharmonic downward frequency-modulated (FMdown) sounds which levelled off as a constant frequency (CF), and the “clatter strophe” was composed of a number of multiharmonic FMdown sounds which became shallow at the end as a short CF. The sounds of the landing strophe and the ¶clatter strophe differed in repetition rate, duration, harmonic components and frequency. Time pattern and peak frequency of the two sound types differed highly significantly between single, unidentified bats. The sounds were inter-individually distinct when the three parameters were combined as an acoustical space. Therefore, these vocalisations might be used for individual recognition in adult bats.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 41 (1908), S. 3187-3199 
    ISSN: 0365-9496
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...