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  • 1
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The results presented in this paper show that collagen fibers can be clearly distinguished from reticular fibers using the picrosirius-polarization method. A morphologic and morphometric study of these two types of fibers with electron microscopy shows that reticular fibers are characterized by the smaller diameter of their fibrillar components and the higher content of interfibrillar material, resulting in a loose arrangement of the fibrils. The evidences presented suggest that the amorphous matrix in which fibrils are embedded is responsible for the silver impregnation of reticular fibers. Our results show that the matrix of reticular fibers is characteristically rich in heparitin sulfate, and that the glycosaminoglycans present show a high interaction with the fibrillar component of these fibers.
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  • 2
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultrastructural and histochemical studies performed on the skeletal elements of the tail fins of six representative species of teleosts enabled the following observations to be made. The electron microscopic pattern of amorphous substance deposition, and the diameter of the collagen fibrils, in lepidotrichia closely resemble those which are typical of cartilage. In addition, lepidotrichia contain chondroitin sulfate AC as the only sulfated glycosaminoglycan, and this glycosaminoglycan shows high levels of interaction with collagen, both features being characteristic of cartilage. Furthermore, the histochemical data presented in this paper suggest that not all of the glycosaminoglycans present in lepidotrichia are bound to protein cores to form proteoglycans. Each actinotrichium consists of a single ultrastructural entity of remarkable width and, thus, is not composed of a bundle of discretely separated collagen fibrils but rather of hyperpolymerized collagen molecules. This aspect differs from the arrangement pattern of all the other interstitial collagens, suggesting that actinotrichia may contain a new type of collagen.
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  • 3
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The present findings show that both elastic system fibers and collagen markedly resisted change in tissues more than 2000 years old. The distribution of elastic fibers and elastic-related fibers (namely, oxytalan and elaunin fibers) in mummified tissues coincided with the observations made on the modern human tissues used as controls. The collagenous structures present in tissue sections obtained from the Egyptian mummy studied took on a deeply red colour when stained in the Picrosirius solution indicating that, as well as in the fresh controls, the basic groups in the collagen molecules were available for reacting with the strongly acidic dye Sirius Red. When viewed with polarized light, the collagen in the same tissue sections displayed an increased birefringence, which shows that the collagen molecules in mummified tissues maintain the oriented disposition which is typical of the modern human tissues used as controls. The methods employed have proved to be useful for the delineation of the elastic system fibers and of the collagenous scaffolding, which may be used as valuable landmarks in the study of the histoarchitecture of organs that have undergone considerable distortion.
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  • 4
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Using only one histologic preparation and under the light microscope, the simple Picrosirius-polarization method permitted the histochemical characterization of the collagenous nature of amianthoid fibers infile cases of salivary gland tumors. In this regard the foregoing results agree with the electron microscopic and X-ray diffraction observations recorded in the literature. Not only did the Picrosirius-polarization method permit the precise characterization of the collagenous nature of asbestoid change but it was also useful for studying the degree of collagen polymerization in the lesion. Collagen molecules in the amianthoid fibers showed hyperpolymerization whereas the molecules in the compact areas were disoriented. Since the foregoing results demonstrate that the Picrosirius-polarization method is a simple and sensitive procedure for detecting asbestoid change in cartilage sections obtained from paraffin-embedded tissues, the usefulness of this technique for studying file cases is evident.
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  • 5
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Normal skin biopsy specimens obtained from 5 representative species of mammals, including man, were studied by the silver impregnation technique for reticulin fibers, by the histochemical Picrosirius-polarization method which is specific for collagen, and by transmission electron microscopy. The finely woven meshwork of argyrophilic reticulin fibers present in the adventitial dermis showed characteristics which are typical of collagen type III, when studied by aid of the Picrosirius-polarization method and by electron microscopy. On the other hand, the coarse collagen fibers of the deeper layers displayed ultrastructural and histochemical aspects which are characteristic of collagen type I. The foregoing observations support previous biochemical and immunohistologic findings, strongly suggesting that collagen type III is found mainly in the upper dermis while collagen type I predominates in the deeper layers.
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  • 6
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fact that collagen from both normal nerve endoneurium and Schwann cell tumours present characteristics of collagen type III, suggests that Schwann cells produce this type of collagen.
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  • 7
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Es wurde der zeitliche Verlauf des Einbaus radioaktiver Aminosäuren (Phenylalanin-3-C14, Alanin-1-C14, Histidin-2-C14 und Methionin-S35) in die Proteine des Pankreassaftes der Ratte untersucht. Ein Maximum des Einbaus kommt zwischen der zweiten und vierten Stunde nach Injektion der Aminosäuren vor, während in der ersten Stunde praktisch keine radioaktiven Proteine nachgewiesen werden konnten. Die Ergebnisse werden verglichen mit denen früher beschriebener Versuche mit Glyzin-C14.
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 174 (1954), S. 698-698 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] However, dog liver is exceptionally rich in mast cells3, and the contamination of the mitochondrial fraction with mast cell granules during the differential centrifugation must be considered in the interpretation of these papers. We report here experiments performed in order to observe the ...
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 178 (1956), S. 258-259 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As part of a general study of the synthesis of proteins of rat pancreas, pancreatic juice was analysed by means of paper electrophoresis. It was collected for three hours after a secretin-carbamoylcholine stimulus, as described by Junqueira, Hirsch and Rothschild5, at 0 C. The electrophoresis of ...
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 547-548 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Riley and West8 and Riley4 observed a striking correlation between mast cells content of a tissue and its concentration of histamine. In addition, Riley5 and we6 verified disruption of mast cells in conditions in which histamine liberation occurs. These papers suggest that mast cells might be a ...
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