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
Filter
  • Autoradiography  (3)
  • Liver  (2)
  • Ultrastructure  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 392 (1981), S. 159-170 
    ISSN: 1432-2307
    Keywords: Gastric ulcer ; Repair ; Autoradiography ; Cryosurgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary By a cryosurgical method a mucosal defect was produced in the body of the rat stomach, and repair of the gastric ulcer was studied with 3H-thymidine autoradiography. From 18 to 24 hours after cryoinjury, cell proliferation in the fundic mucosa was much increased, as indicated by an increase in the labeling index of the cells in the proliferating cell zone of the mucosa, or by reactive incorporation of 3H-thymidine into the mucous neck, chief and parietal cells. Spatially, the increased cell proliferation was found in a region of the mucosa more than 600 μrn distant from the injury, and lasted for more than 14 days. The mucous neck and chief cells around the ulcer which had incorporated 3H-thymidine seemed to transform into flat cells after mitotic division and then continued to divide. After 3–5 days, so called regenerating epithelium or covering epithelium appeared around the ulcer. The upper part of this regenerating epithelium consists of tall columnar cells, the lower part is composed of cystic glandular structures, in which many 3H-thymidine incorporating cells were seen. The formation of new glands in the mucosal defect appeared to take place by budding from these cystic glandular structures with subsequent differentiation of surface epithelial cells. After 3 weeks the mucosal defect was covered by mucinous glandular structures similar to the proper pyloric mucosa. The proliferating cells were confined to the middle level in the regenerated mucosa.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 171 (1977), S. 1-12 
    ISSN: 1433-8580
    Keywords: Thermonecrosis ; Liver ; Wound healing ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Histological and autoradiographical studies were performed on the liver of rats after local thermonecrosis. The results were compared with those after local cryonecrosis. After thermocoagulation (740°C/4 sec) each animal received an i.p. injection of3H-TdR (2.5 µC/1 g body weight). The survival times ranged from 12 hours to 30 days. In the HE stained histological slides the morphological changes and the percentages of the cells in the granulation tissue and in the stripping film autoradiograms the percentages of radio-actively labeled fibroblasts and hepatocytes were determined. After 12–24 hours the thermonecrosis is complete with leucocytic demarcations. Five days later widespread granulation tissue develops in the marginal zone of the necrosis. 20 to 30 days after thermocoagulation small necrotic parts are still seen in the center surrounded by a fibrous scar. Autoradiographically the highest percentages of labeled epithelial and mesenchymal cells are observed between the second and the third postoperative day. Four weeks after thermonecrosis there are still increased cellular proliferative activities. Therefore, it can be stated that the inflammatory resorptive woundhealing processes following thermonecrosis in the liver are maintained much longer than after other physical injuries especially after cryonecrosis.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 176 (1979), S. 143-156 
    ISSN: 1433-8580
    Keywords: Liver ; Ductus choledochus ligation ; Woundhealing ; Cryonecrosis ; Leber ; Ductus-choledochus-Unterbindung ; Wundheilung ; Wundheilung ; Kryonekrose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Wundheilung fokaler Kryonekrosen an der biliärobstruktiv geschädigten Leber nach Ductus-choledochus-Unterbindung wurde zellanalytisch und zellkinetisch untersucht und mit den Resultaten an der nicht vorgeschädigten Leber verglichen. Die umschriebene Kryonekrose wurde durch eine Kyrosonde bei −196°C über 30 s an der Leber gesetzt. Bei der Zellanalyse des Granulationsgewebes wurden die Prozentsätze von Leukozyten, Monozyten, Makrophagen, Lymphozyten, Fibroblasten und Fibrozyten untersucht. Ferner wurden zellkinetisch die Prozentsätze3H-Thymidin-markierter Wundfibroblasten im Granulationsgewebe sowie in Randzonen an der Nekrose die Markierungsindices der Hepatozyten, Sternzellen und Gallengangsepithelien bestimmt. Die postoperativen Versuchszeiten betrugen 12 h bis 4 Wochen. Die morphologischen Stadien der Entwicklung einer Kryonekrose und ihrer Abheilung in der ungeschädigten und der durch Ductus-choledochus-Unterbindung geschädigten Leber zeigen übereinstimmend, daß nach 3–4 Wochen das kryonekrotische Gewebe weitgehend resorbiert ist und durch ein Narbengewebe ersetzt wird. In der cholostatisch vorgeschädigten Leber entwickeln sich eine stärkere Makrophagenaktivität und eine ausgeprägte Gallengangsproliferation. Für alle untersuchten epithelialen und mesenchymalen Zellen finden sich zellkinetisch die Proliferationsmaxima im Bereich der Kryonekrose zwischen dem 2. und 3. Versuchstag. Die reparative Regeneration nach in situ-Gefrierung der durch Ductus-choledochus-Unterbindung geschädigten Leber ist ebenso wie in der ungeschädigten Leber auf eine sehr schmale Parenchymzone in der unmittelbaren Nachbarschaft der Kryonekrose begrenzt. Das entfernt von der Kryonekrose liegende Lebergewebe zeigt keine wesentlichen Reaktionen auf den Kryodefekt. Der zellkinetische und zellanalytische Vergleich hat ergeben, daß ein einmaliger kryochirurgischer Eingriff nicht zu einer nennenswerten Verzögerung oder Beeinträchtigung der Wundheilung in der biliär-obstruktiv geschädigten gegenüber der nicht vorgeschädigten Leber führt.
    Notes: Summary Histological and autoradiographic studies were performed to investigate and to compare the woundhealing of focal cryonecroses in the normal liver and the liver after ligation of the ductus choledochus. Four weeks after ligation of the ductus choledochus a small area of the liver tissue was frozen for 30 s at a temperature of − 196°C utilising a cryoprobe. The animals were sacrified of various intervals lasting from 12h to 4 weeks. In the developing granulation tissue a cell analysis was done and the percentages of leucocytes, monocytes, macrophages, lymphocytes, fibroblasts and fibrocytes were determined. In the autoradiograms the percentages of radioactively labeled fibroblasts, Kupffer cells, hepatocytes and bile duct cells were computed. There are no significant differences in the morphologic picture of the cryonecrosis in the liver with and without biliary obstruction. 3–4 weeks after in situ freezing the cryonecrotic tissue has been resorbed and only a small connective tissue scar is now visible. However, in the granulation tissue of the liver with biliary obstruction stronger macrophage activities and bile duct proliferations develop. Cellkinetically the different kinds of epithelial and mesenchymal cells show maximal values of DNA synthesis after in situ freezing between the 2nd and 3rd postoperative days. The increased reparative regeneration, however, is located only in the small tissue area in the vicinity of the cryonecrosis. These cellanalytical and cellkinetic investigations have shown that a single cryosurgical lesion in the liver which is comparable to a diagnostic wedge excision during cholecystectomy induces no noteworthy changes in the dynamics of the woundhealing of the liver with and without biliary obstruction.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 87 (1976), S. 311-320 
    ISSN: 1432-1335
    Keywords: Autoradiography ; Prostatic cancer ; Labeling and Mitotic Index ; Hormonal Therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 387 Prostatacarcinome wurden histologisch und z.T. auch autoradiographisch untersucht. 45,7% der Carcinome zeigten einen uniformen glandulären, cribriformen oder solide anaplastischen Aufbau. 54,3% waren pluriform aufgebaut. Hoch- und wenig differenzierte Adenocarcinome machten mit 44,0% den Hauptanteil aus. Sehr oft fanden sich cribriforme Carcinomanteile neben anderen Strukturen. Der Mitoseindex der Adenocarcinome reichte bis zu 0,02%, der der cribriformen und solide anaplastischen Carcinome bis zu 0,6%. Auch die Markierungsindices der Adenocarcinome waren außerordentlich niedrig (0,69% bzw. 0,83%). Cribriforme und solide anaplastische Carcinome hatten höhere Werte bis zu 7,0%. Hyperplastische Drüsenschläuche in Nachbarschaft von Carcinomen zeigten doppelt so hohe Markierungsindices wie die Epithelien bei nodulärer Hyperplasie ohne Carcinom. Unter Oestrogentherapie fanden sich in Kontrollbiopsien von Adenocarcinomen deutliche Tumorregressionen und erniedrigte Markierungsindices im Vergleich zu den Werten von Therapiebeginn. Keine Änderungen der Markierungsindices wurden in einem Fall von Adenocarcinom und zwei weiteren Fällen von cribriformen und solide anaplastischen Carcinomen beobachtet. Diese Befunde stimmen gut mit Angaben aus der Literatur überein, in denen betont wird, daß glanduläre Carcinome offenbar besser auf eine Hormontherapie ansprechen als solide anaplastische und cribriforme Carcinome der Prostata.
    Notes: Summary 387 carcinomas of the prostate gland were examined histologically and partly by autoradiography. 45.7% of the carcinomas were uniformly structured whereas 54.3% showed a pluriform pattern. Highly and poorly differentiated adenocarcinomas predominated. Very often cribriform structures were found besides other carcinomatous parts. Autoradiographically the labeling indices of adenocarcinomas were extremely low (0.69% and 0.83% respectively). Higher values could be observed in cribriform and solid anaplastic carcinomas with labeling indices up to 7.0%. The mitotic indices of adenocarcinomas and anaplastic carcinomas ranged between 0.01–0.6%. In the hyperplastic glandular epithelia in the vicinity of carcinomas a labeling index was found which was twice as high as in nodular hyperplasia without carcinoma. Adenocarcinomas treated with estrogens showed decreased labeling indices. Changes in the labeling indices were not observed in one case of a adenocarcinoma and in two cases of cribriform and solid anaplastic carcinomas. These results are in good agreement with those described in the literature, in which it is pointed out, that glandular carcinomas have a better sensibility to hormonal therapy than solid anaplastic or cribriform carcinomas of the prostate.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 101 (1981), S. 219-226 
    ISSN: 1432-1335
    Keywords: Giant-cell reaction ; Small tubular bone ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Light- and electron-microscopic investigations were performed in a case of cystic soap-bubble-like expansion of the shaft region of the second metatarsal bone. Morphologically, strongly cellular tissue with a closely packed net of osteoid trabeculae containing osteoblasts and a whorl-shaped spindle cell stroma with fibroblasts, fibrocytes, and irregularly scattered multinucleated giant cells of the osteoclast type were observed. After clinical and morphological exclusion of osteosarcoma, enchondroma, non-ossifying fibroma, osteoblastoma, osteoclastoma, and bone cysts the final diagnosis was giant-cell reaction of small tubular bone with unusual marked osteoid formation. As recurrences are possible, block resection appears more appropriate than curettage.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1432-0878
    Keywords: Spleen (rat) ; Ultrastructure ; Periarteriolar lymphatic sheath ; Interdigitating cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary To obtain more information concerning the origin of interdigitating cells, the postnatal development and morphology of the periarteriolar lymphatic sheath in splenic white pulp of rats was investigated by light- and electron-microscopy. Special attention was paid to the ontogeny of interdigitating cells. The spleens of the animals were studied in the age range from 1 h to 28 days after birth. The splenic white pulp of neonatal rats consists only of a few reticuloblasts, which are concentrically arranged around central arterioles. After 21 h an increase in promonocytes and monocytes was noted. Between the fifth and seventh postnatal day monocytogenic cells with a light and almost translucent cytoplasm appear, which display long cytoplasmic projections between the adjacent cells. Neighbouring lymphocytes often insert finger-like processes into the invaginated cellular membrane of these transitional forms. This intimate cellular contact is supported by zonulae occludentes. These cells represent transitional forms between monocytes and interdigitating cells. From seven days of age onwards typical interdigitating cells were present as in adult animals. After the differentiation into an inner and outer periarteriolar lymphatic sheath, the T-cell-dependent area of splenic white pulp has attained its adult appearance and further changes are not to be expected. On the basis of these findings, it is highly probable that interdigitating cells develop via transformation of monocytes.
    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...