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  • Autoradiography  (9)
  • Springer  (9)
  • National Academy of Sciences
  • 2020-2024
  • 1990-1994
  • 1970-1974  (9)
  • 1970  (9)
Collection
Publisher
  • Springer  (9)
  • National Academy of Sciences
Years
  • 2020-2024
  • 1990-1994
  • 1970-1974  (9)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 111 (1970), S. 75-89 
    ISSN: 1432-0878
    Keywords: Lymphocytes ; Replacement rate ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Bei jugendlichen erwachsenen, weiblichen Ratten wurden der Markierungsindex und die Markierungsintensität kleiner Lymphozyten und größerer lymphoider Zellen im zirkulierenden Blut und in Lymphknoten während und nach langzeitig wiederholten Injektionen von Thymidin-3H verfolgt. Die radioaktive Vorläufersubstanz wurde in 8stündigen Intervallen über eine Zeitdauer von 30 Tagen intramuskulär verabreicht. Unter der Annahme, daß es bei diesem Verfahren zu keinen nennenswerten radiogenen, pharmakologischen oder hormonalen Störungen kam, erscheinen die nachstehenden Schluß folgerungen gerechtfertigt: 1. Während des ersten Tages der Injektionsperiode wurden im Mittel 18% (Maximum: 29%) unmarkierte kleine Lymphozyten durch markierte ersetzt. Die Markierungsindices dieser Zellart im Blut, als Funktion der Zeit nach Beginn der wiederholten Injektionen von Thymidin-3H, ergaben eine Kurve, die um den 8. Tag herum 50% und nach 30 Tagen 79% (Maximum: 85%) erreicht. 2. Die Resultate lassen sich am ehesten mit der Annahme in Einklang bringen, daß die Häufigkeitsverteilung der verschiedenen Werte für die G 0-Zeit (Erklärung im Text), bzw. Verweiloder Rezirkulationsdauer, der kleinen Lymphozyten im peripheren Blut eine kontinuierliche ist und einen Gipfel bei einem bis mehreren Tagen aufweist. 3. Die größeren lymphoiden Zellen im peripheren Blut wurden in ihrer überwiegenden Mehrzahl wesentlich rascher umgesetzt als die kleinen Lymphozyten. 4. Der Markierungsindex der kleinen Lymphozyten in Lymphknotenausstrichen entsprach am Ende der Injektionsperiode demjenigen im peripheren Blut. Am Ende der Injektionsperiode fanden sich in den äußeren Rindenschichten der Lymphknoten, wo der schwer mobilisierbare Pool von Lymphozyten liegt, mindestens ebenso viele unmarkierte kleine Lymphozyten wie im zirkulierenden Blut. 5. Die Blutmonozyten waren 4 Tage nach Beginn der wiederholten Injektionen von Thymidin-3H zu 100% markiert und behielten diesen Markierungsindex während der restlichen Injektionsperiode bei. Die Befunde werden im Zusammenhang mit Fragen des Proliferationsmodus und der Wanderungsmöglichkeiten der Lymphozyten sowie ungenügender autoradiographischer Wirksamkeit besprochen und mit den von anderen Autoren mitgeteilten Resultaten nach kontinuierlicher intravenöser Infusion von Thymidin-3H verglichen.
    Notes: Summary Young adult female Sprague-Dawley rats were given intramuscular injections of thymidine-3H at 8-hour intervals for a period of 30 days in order to follow the labeling indices and labeling intensities of small lymphocytes and of large lymphoid cells in the circulating blood and lymph nodes. Assuming that radiotoxic, pharmacological and/or hormonal effects were negligible, the following conclusions seem to be justified: 1. During the first day of the injection period the labeling index of small lymphocytes in the peripheral blood rose from zero to an average of 18% (maximum: 29%). Labeling indices of this cell type in the circulating blood, as a function of time after onset of the labeling procedure, followed a curve which reached 50% around day 8 and 79% at the 30 day terminal interval. 2. Results can best be explained by the hypothesis that the frequency distribution of the values for G 0 time or residence (recirculation) time of small lymphocytes in the circulating blood is a continuous one and shows a marked peak from one to a few days. 3. Large lymphoid cells in the peripheral blood were replaced much more rapidly than small lymphocytes. 4. The labeling index of small lymphocytes in lymph node smears at the end of the injection period corresponded to that of small blood lymphocytes. Autoradiographs of histological sections revealed that the outer zones of the lymph node cortex which contains preferentially the more sessile pool of lymphocytes, contained as high a percentage of unlabeled small lymphocytes as did the circulating blood. 5. Blood monocytes were labeled to 100% 4 days after beginning repeated injections of thymidine-3H and maintained this labeling index throughout the labeling period. These results are discussed in respect to the proliferative pattern and migrational behavior of lymphocytes and to the problem of autoradiographic inefficiency. Data are compared to those obtained with continuous intravenous infusion of thymidine-3H.
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  • 2
    ISSN: 1432-0878
    Keywords: RNA synthesis ; Spinal ganglia cell cultures ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Dissociated cells from 9, 12 and 15 day-old chick embryo spinal ganglia were cultivated in presence of total embryo-extract, brain embryo extract, or total embryo extract supplemented with purified nerve growth factor (NGF). The cells were maintained during 4 days in Maximow assembly and during 1 month in Rose chamber. Neurons showed growth of nerve fibres. The non-neural cells evolved to spindle cells, Schwann cells, or fibroblasts. Ribonucleic acid (RNA) synthesis was followed with tritiated uridine by autoradiography. Some nerve cells showed tritiated uridine incorporation. The highest incorporations for short-term cultures were at 15 hours in presence of NGF, at 48 hours in presence of total or brain extract, and for long-term cultures at 8 days. These periods corresponded to the highest growing activity of the nerve fibres. After 4 days all the non-neural cells incorporated tritiated uridine. The tritiated uridine was first incorporated into the RNA of the nucleus and, afterwards was found also in the cytoplasm. The presence of brain extract or of NGF stimulates the incorporation of labelled uridine into RNA. No labelling was found in the nerve fibres, even after 4 hours incubation.
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  • 3
    ISSN: 1432-0878
    Keywords: Basement membrane ; Glucose-H3 ; Teleost ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Autoradiography has been employed to investigate the site of origin of the adepithelial basement membrane, or basal lamina, of the skin of Fundulus heteroclitus. Both tritiated glucose and proline were used as radioactive precursors in organ culture. Glucose was progressively segregated and concentrated in two areas of the epithelium: (1) in the superficial layer of cells near the external surface, and (2) in the cortex of the basal layer near the basement membrane. After 12 hours the basement membrane was also labeled, and after 24 hours the epithelium, basement membrane (basal lamina), and basement lamella were all labeled. We have concluded that the label over the superficial layer of epithelium near the external surface of the fish represents glucose incorporation into mucous secretion products; and that label over the basal cell layer, basement membrane, and basement lamella represents synthesis by the epithelium of glucose-rich components, perhaps mucoproteins, of the basement membrane and of the ground substance of the basement lamella. Not all areas of the epithelium and underlying connective tissue incorporated glucose at the same time, and only after 24 hours were unlabeled areas of the skin eliminated. Proline incorporation was much less specific than that of glucose. Although the epidermis and dermis were heavily labeled, proline was incorporated in almost every tissue of the fish. The value of proline as a specific label for collagen is questioned.
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  • 4
    ISSN: 1432-0878
    Keywords: Adrenal cortex ; Corticosterone ; Autoradiography ; Morphometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effects of corticosterone on adrenocortical cells of intact and hypophysectomized ACTH-treated rats were investigated by morphometric and autoradiographic methods. The data obtained in these experiments allow us to make the following conclusions: 1 The most important morphological parameter for assessing the activity of a steroid-secreting cell is the quantity of smooth endoplasmic reticulum. 2 The decrement in the smooth reticulum in adrenocortical cells of rats treated with corticosterone is due to an inhibition of the protein synthesis by the hormones themselves. 3 There is in vivo a direct negative feed-back control mechanism at the adrenal level, mediated by an inhibition of the RNA synthesis by the corticosteroid-hormones. 4 The trophism of the mitochondrial fraction of adrenocortical cells is controlled by ACTH. It is possible to hypothesize that ACTH intervenes in the regulation of the mitochondrial RNA and DNA synthesis.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 106 (1970), S. 189-199 
    ISSN: 1432-0878
    Keywords: Thyroid hormones ; Tissue culture ; Neurons ; Autoradiography ; Differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Cultures of embryonic mouse and rat spinal cord-dorsal root ganglion combinations, and of newborn hamster and rat cerebellum were treated with 5×10-6M I-125 thyroxine and I-125 triiodothyronine. Autoradiographic studies on glutaraldehyde-osmium tetroxide fixed tissue indicated that these hormones were located predominantly in neurons, but could be found in glia cells as well. This pattern was observed in cultures treated for 2 hours to 4 days. Some of the effects of thyroid hormones on the developing nervous system were therefore linked to a direct action of these hormones on nerve cells. Furthermore, the label was seen not only over the cytoplasm, as might be expected from past biochemical studies, but was also present over the nucleus, particularly the nucleolus. This suggested a possible role for these hormones in the process of translation.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 104 (1970), S. 572-581 
    ISSN: 1432-0878
    Keywords: Hypothalamus ; Rat ; Cellular Localization of 3H-Oestradiol ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The hypothalamus of male and female rats, given 0.3 μg/100 g body weight of 6.7-3H-oestradiol-17β and killed 1 hour after the injection, was examined by autoradiography in order to 1) localize the areas and the cells involved in the uptake of the hormone, and 2) study the intracellular localization of the labelled material. Only nerve cells contained radioactive material while glial and ependymal cells were not significantly labelled. In the anterior hypothalamus, labelled nerve cells were concentrated in areas corresponding to nucleus preopticus medialis and nucleus preopticus, pars suprachiasmatica. The nucleus supraopticus was unlabelled. In the medial basal hypothalamus, neurons corresponding to the nucleus arcuatus and the lateral part of the nucleus ventromedialis showed marked labelling. No significant labelling was observed in the nucleus paraventricularis, pars magnocellularis. Although the individual nerve cells varied in their extent of labelling, the major proportion of the silver grains were consistently concentrated over the nuclei. Castration was not found to influence the results. The findings were essentially the same in male and female rats and appear to suggest that oestradiol exerts a direct effect on nerve cells in certain hypothalamic areas.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 104 (1970), S. 597-614 
    ISSN: 1432-0878
    Keywords: Hypophysis ; Rat ; Localization of 3H-Oestradiol ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pituitaries of male and female rats given 0.3 μg of 6.7-3H-oestradiol-17β per 100 g body weight were examined by autoradiography in order to 1) identify the cells responsible for the uptake of the hormone, 2) determine the intracellular distribution of the hormone and quantify the proportions localized within the cytoplasm and nucleus by silver grain counting, and 3) see if sex differences existed in the cellular and intracellular distribution of the hormone. The animals were killed at intervals varying from 1 minute to 8 hours following intravenous or intramuscular injection. A large proportion of pituitary cells having the morphologic characteristics of acidophils, basophils and chromophobes contained radioactive material. Castration cells and acidophils of gonadectomized and lactating rats showed marked labelling. In male and female rats killed 10 minutes after intravenous injection, 84.4 and 83.6 per cent of the cells were labelled. One hour after intramuscular injection, 86.6 and 76.1 per cent of the cells were labelled in males and females, respectively. Thus, a small proportion of the cells remained unlabelled. Labelled cells showed silver grains both in the cytoplasm and over the cell nuclei, but the major proportion of the radioactive material was invariably associated with the cell nuclei in all cell types and at all time intervals. About 65 per cent of the radioactive material was associated with the cell nuclei in animals killed five minutes or one hour after intravenous or intramuscular injection of the hormone. The silver grains appeared to be randomly distributed in both the cytoplasm and over the cell nuclei. In the intermediate lobe and the neurohypophysis, only sparse labelling with random distribution was observed. At the border between the intermediate lobe and the neurohypophysis, labelling of single cells or clusters of cells similar to those in the adenohypophysis was found. The results, which were essentially the same in male and female rats, appear to indicate a direct effect of oestradiol at the pituitary level.
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  • 8
    ISSN: 1432-0878
    Keywords: Duodenum and colon ; Epithelium ; Proliferative cells ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The duodenal and colonic epithelia in mice were observed with electron microscopic autoradiography 2, 5 and 24 hours after a single injection of 3H-thymidine. After 2 hours, in the duodenum, silver grains are found in many undifferentiated cells, in a few young goblet cells, in some crystal-containing cells, and in some lymphocytes. In the colon after 2 hours silver grains are seen in some undifferentiated cells, and in many young goblet cells. Undifferentiated cells are characterized by a few short microvilli, poorly developed rough-surfaced endoplasmic reticulum, abundant free ribosomes, and a few apical moderately dense granules. In normal animals, absorptive cells seem to arise from undifferentiated cells, and goblet cells — from younger goblet cells. Undifferentiated cells could also become young goblet cells. Crystal-containing cells, which may not be of epithelial origin, proliferate in the epithelium in the adult animal.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 104 (1970), S. 358-374 
    ISSN: 1432-0878
    Keywords: Collagen ; Secretion ; Byssus ; Mytilus edulis ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé L'autoradiographie révèle, au niveau du pied, une incorporation massive et sélective de la 3H-Proline dans la ≪glande blanche≫ de Mytilus edulis. Cette étude a permis de suivre le processus qui mène de la synthèse de la sécrétion dans la partie basale des cellules jusqu'a son émission dans le sillon pédieux où elle participe à la formation du filament. La collagénase détruit la presque totalité du marquage, attestant ainsi la nature collagénique du produit sécrété. Les autres glandes pédieuses ainsi que la glande du byssus proprement dite, située à la base du pied, montrent une incorporation très faible, sans commune mesure avec celle de la ≪glande blanche≫. Ceci démontre de façon définitive que le collagène présent dans le filament prend naissance dans cette glande et justifie la dénomination de ≪glande du collagène≫. Des contrôles réalisés dans différentes régions (bords du manteau, manteau, branchies) montrent que l'injection du précurseur dans le bord palléal constitue une méthode satisfaisante pour marquer de façon relativement rapide et différentielle le collagène de la glande.
    Notes: Summary Autoradiographic studies reveal a strong specific incorporation of 3H-Proline in the “white gland” in the foot of Mytilus edulis. The author could trace the radioactive secretory product from its synthesis in the basal part of the cells down to its outflow into the pedial groove where it takes part in the formation of the filament. Purified collagenase takes out radioactivity from the sections. This observation confirms the collagenous nature of the secretion. The other foot-glands as well as the main “byssus gland” located at the base of the foot show but a very weak labelling not comparable with that of the “white gland”. This clearly evidences that the collagen occuring in the filament originates from the latter. The “white gland” may be properly called: “collagen gland”. Control sections through different parts of the body (mantle-edge, mantle, gills) confirm that our injection technique of the precursor into the palleal margin is a suitable method for a rather quick and specific labelling of the glandular collagen.
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