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  • 1
    ISSN: 1432-1440
    Keywords: Fetal globulins ; Gastric cancer ; Gastric ulcer ; Immunohistochemistry ; Tumor associated antigens (TAA) ; Fetale Antigene ; Immunhistochemie ; Magengeschwür ; Magencarcinom ; Tumorantigene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Untersucht wurde das Vorkommen von Alpha1-Fetoprotein in der pathologisch veränderten Magenschleimhaut. Der Nachweis wurde immunhistochemich, an Schnittpräparaten und Zellausstrichen und radioimmunologisch an Homogenaten, Serum und Magensaft geführt. Im Ulcusrand bzw. im Anastomosenbereich eines B II-Magenstumpfes war der immunfluorescenzmikroskopische Nachweis in 90% positiv, radioimmunologische Untersuchungen erbrachten 75 bzw. 80% positive Ergebnisse. Im Magensaft der Patienten mit Ulcus ventriculi gelang der radioimmunologische Nachweis von Alpha1-Fetoprotein in 40% der Fälle, bei Patienten mit B II-Resektion in 39%, während beim Carcinom in drei von fünf untersuchten Fällen Alpha1-Fetoprotein nachweisbar war. Im Serum der Ulcus- bzw. B II-Patienten verlief die radioimmunologische Untersuchung in sämtlichen Fällen negativ, zwei der fünf Serumproben von Patienten mit Magencarcinom erweisen sich als Fetoprotein-positiv. Alpha1-Fetoprotein kommt somit in kleinen Konzentrationen in pathologisch veränderter Magenschleimhaut vor, wobei die höchste Konzentration in Regionen erhöhter Epithelproliferation, welche zytophotometrisch und autoradiographisch ermittelt wurde, zu beobachten ist. Die Alpha1-Fetoprotein-Neosynthese ist somit nicht auf embryonales und fetales Gewebe beschränkt; sie kann auch von Zellen einer regenerierenden bzw. pathologisch veränderten Schleimhaut übernommen werden. Es scheint sich dabei um eine unspezifische Antwort auf wachstumsstimulierende Reize zu handeln.
    Notes: Summary The occurrence of a1 fetoprotein in nonmalignant changes of the gastric mucosa was investigated by means of immunohistochemistry and radioimmunoassay. The investigations were performed in tissue sections, cytological imprint preparations as well as in homogenized tissue samples (obtained by gastroscopy). a1 fetoprotein could be demonstrated by immunohistochemistry in about 90% of the samples originating from the surroundings of gastric ulcer and the region of gastrojejunostomy after B II-resection. The RIA was positive in about 75% of the tissue samples, whereas from gastric juice only 40% of positive results could be obtained. No a1 fetoprotein-activity could be demonstrated in serum samples. These investigations indicate that a1 fetoprotein is not exclusively synthesized by embryonic or neoplastic tissues and also can be synthesized also by regenerating cell-systems. It may be supposed that this synthesis represents an unspecific answer to growth-stimulation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 24 (1977), S. 73-79 
    ISSN: 1432-0827
    Keywords: Bone cells ; Cyclic GMP ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Guanosine 3′,5′-monophosphate (cyclic GMP, cGMP) was localized in bone cells by the use of an immunoglobulin-enzyme bridge method. We observed that in cat alveolar bone most osteoblasts did not stain for cGMP, while adjacent periodontal cells displayed cytoplasmic as well as nuclear staining. Numerous osteocytes contained diffuse reaction products over most or all of the cellular area. The method used in this study may be helpful in identifying specific hard tissue cell types whose function(s) involve cGMP.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0878
    Keywords: Hypothalamo-neurohypophysial system ; Birds ; Vasotocin neurons ; Mesotocin neurons ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The results of an immunohistochemical investigation of the hypothalamo-neurohypophysial system in several species of birds have shown that: (1) mesotocin and vasotocin are synthesized in separate neurons; (2) in all species investigated the distribution of mesotocinergic and vasotocinergic perikarya follows a common pattern; (3) the external zone of the avian anterior median eminence contains exclusively vasotocinergic nerve fibers, originating in supraoptic and ventral paraventricular regions; (4) the distribution of immunoreactive elements in the neural lobe shows a definite species-dependent pattern.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0878
    Keywords: GEP-system ; Small intestine ; Human embryo ; Neurotensin ; Development ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The endocrine gastro-entero-pancreatic (GEP) system of 10 human embryos was studied with special reference to neurotensin-immunoreactive cells. These cells are first present in the ileal and jejunal mucosa of 12 to 13 week old embryos. Thereafter the neurotensin-immunoreactive cells are found regularly in these segments of the gut with an increasing number towards the terminal ileum. At about the twentieth week of gestation, the neurotensin cells are detected also in the lower duodenum, i.e. the distribution pattern is more extensive in this age than in younger embryos or in adults.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 176 (1977), S. 529-551 
    ISSN: 1432-0878
    Keywords: Pancreatic islets ; Correlative light and electron microscopy ; Immunohistochemistry ; Insulin ; Glucagon ; Xiphophorus helleri
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Cinq catégories cellulaires sont décrites dans l'îlot endocrine du poisson téléostéen Xiphophorus helleri. Chacune est définie par un ensemble de caractères histochimiques et ultrastructuraux, ce qui peut être fait avec certitude grâce à l'étude comparée de coupes ultra-fines et sémi-fines successives. Les techniques d'immunofluorescence ont été appliquées à du matériel préparé pour la microscopie électronique, à l'aide de sérums anti-glucagon et anti-insuline de porc. Un des résultats les plus intéressants est la démonstration de l'existence de 2 catégories de cellules A2: les cellules Adams positives, qui ont des grains de sécrétion amorphes et de section circulaire (≪ cellules à grains ronds ≫) et les cellules Adams négatives, dont de nombreux grains sont des cristaux (≪cellules à grains cristallins≫). Les cellules B et les cellules A1 constituent deux autres types cellulaires. Les ≪cellules claires≫, qui ne réagissent à aucune des techniques employées, représentent un type cellulaire distinct des précédents. L'influence de la fixation se révèle très importante, aussi bien sur les affinités tinctoriales des cellules que sur leurs caractères ultrastructuraux. The authors are grateful to Mrs. L.G. Heding, Novo Industri A/S, Bagsvaerd, for antiporcine insulin and glucagon sera, to Dr. S. Syed Ali, Elektronenmikroskopie, Zentrum für Anatomie und Cytobiologie, Universität Giessen, for preparing FITC-labeled γ-globulin, and to Mr. D. Streicher, Laboratoire de Zoologie et Embryologie expérimentale, Université Louis Pasteur, Strasbourg, for technical assistance
    Notes: Summary By means of correlative light and electron microscopy, five pancreatic islet cell categories are described in the teleost fish, Xiphophorus helleri, each of which has specific light microscopic appearance and fine structure. Different histochemical techniques have been used, including immunofluorescence with antiporcine insulin and glucagon sera. In addition to B- and A1-cells, two categories of A2-cells have been observed, both reacting with antiporcine glucagon serum: A2-cells with round granules gave a positive reaction for tryptophan; A2-cells with crystalline granules gave a negative reaction with the same staining technique on the same section. The “clear cells”, the last category, were not specifically stained by any of the staining methods carried out in this investigation. The influence of fixation on staining affinities and on ultrastructure was shown to be considerable.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 178 (1977), S. 111-127 
    ISSN: 1432-0878
    Keywords: Rat magnocellular neurosecretion ; Neurophysin ; Vasopressin ; Choroid plexus ; Cerebrospinal fluid ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Neurosecretory pathways were examined in normal male rats by the use of the immunoperoxidase technique for the localization of neurophysin in Bouin-fixed, deparaffinized sections. Using this technique two projections of extrahypothalamic neurosecretory fibers can be traced to the sites of origin of the choroid plexuses of both horns of the lateral ventricles. Neurophysin-containing axons originating primarily from the paraventricular field course dorsolaterad to enter the choroid fissure of the dorsal horn. A caudally directed group of fibers course ventrolaterad to enter the ventral horn choroid fissures. The supraoptic nuclear field is the primary contributor to the latter group. Scattered neurosecretory neurons are found in association with both pathways, usually in contact with blood vessels supplying the choroid plexuses, or in the telencephalic subependymal stroma. Neurosecretory fibers and terminals occur within the choroid fissures and juxtaventricular neuropil. The neurosecretory terminals in the choroid fissures appear as Herring-body type neurohemal organs; in the neuropil they appear as punctate peri-neuronal densities suggestive of synaptic contacts. These morphologic findings are discussed in relation to reports indicating the presence of antidiuretic, vasopressin-like activity in cerebrospinal fluid and choroid plexus extracts together with ultrastructural evidence supportive of vasopressin-mediated transchoroidal cerebrospinal fluid absorption. These results and those of others indicate the possible involvement of the neurosecretory system in the regulation of brain interstitial-ventricular cerebrospinal fluid dynamics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 181 (1977), S. 239-244 
    ISSN: 1432-0878
    Keywords: Melatonin ; Immunohistochemistry ; Pineal gland ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the present study an attempt was made to demonstrate melatonin in the rat pineal gland by means of immunohistochemistry. The anti-body used was raised against 5-methoxy-N-acetyltryptophan which is chemically similar to melatonin. Specific fluorescence was demonstrable only in pineals from rats killed during the night, when melatonin formation is high. It was restricted to parenchymal cells lying in a marginal zone of the organ. These results are discussed in relation to a subdivision of the pineal parenchyma into cortical and medullary areas.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0878
    Keywords: Pancreatic polypeptide ; Endocrine human pancreas ; Histochemistry ; Immunohistochemistry ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The consecutive semithin — thin section method was employed to identify pancreatic-polypeptide-containing cells in the human pancreas. The immunocytochemical staining of semithin sections with the peroxidase-antiperoxidase complex allowed a precise ultrastructural description of the immunoreactive cells on the adjacent thin section. Two populations of small granulated cells could be distinguished with this technique: one group is formed by cells whose secretory granules with a mean diameter of 141 nm show specific immunoperoxidase staining with anti-PP serum, while the other group consists of cells whose secretory granules measuring 118 nm in diameter show no immunoreactivity to anti-PP serum. The former cells which will be designated as PP-cells, are not identical with the D1-cells of the revised Wiesbaden classification of endocrine cells.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0878
    Keywords: Tupaia belangeri (Primate) ; Small intestine ; Neurotensin ; Immunohistochemistry ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The neurotensin-cell is identified immunohistochemically and ultrastructurally by differential counting of endocrine cells in the gut of a primate (Tupaia belangen). Utilizing light microscopy, the EC-cells are identified by the Masson-Fontana silver stain; with the same method the neurotensin cells are not stained. The other endocrine cells have been quantified in the small intestine using the peroxidase-antiperoxidase stain with antisera against glucagon, somatostatin, cholecystokinin, gastrin, secretin, pancreatic polypeptide, gastric inhibitory peptide and neurotensin. In the ileal mucosa of Tupaia, the most frequent endocrine cell is the EC-cell followed by the glucagonoid cell, (L-cell). The immunoreactive neurotensin cell represents the third most frequent endocrine cell in this region. On the ultrastructural level, this third most frequent endocrine cell is a heretofore undescribed cell, the N-cell, containing electron dense secretory granules measuring 335±87 nm in diameter.
    Type of Medium: Electronic Resource
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