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  • 1
    Electronic Resource
    Electronic Resource
    Nuclear elimination from the normoblast of fetal guinea pig liver as studied with electron microscopy and serial sectioning techniquesThis investigation was supported by U. S. Public Health Service grant FR 5353-05. (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 160 (1968), S. 539-553 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The process of denucleation in normoblasts of fetal guinea pig liver was studied with electron microscopy employing serial sections. In the late normoblast the nucleus becomes eccentrically located in the cytoplasm. Continued maturation results in a nucleus which is protruding from the normoblast. Still later the nucleus separates from the remainder of the cell and is phagocytized by a reticular cell. Nuclei which have been extruded are surrounded by a narrow border of cytoplasm and possess a nuclear envelope, nuclear pores, and internal nuclear structure similar to that of normoblasts. The cytoplasmic border and nuclear structure are observed for some time after ingestion by reticular cells. Dissolution of nuclei inside the phagocytes is characterized by disappearance of the cytoplasmic border and nuclear envelope, loss of density of the chromatin, and appearance of dense particles in the interchromatin. It was concluded that under normal conditions, the sole mechanism of denucleation in definitive erythroblasts is extrusion. Mitochondria are partially degraded inside the late erythroblasts, forming a membranous residue which is later extruuded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1091600304
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  • 2
    Electronic Resource
    Electronic Resource
    Immunochemical localization of extracellular materials in bone marrow of rats (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 231 (1991), S. 218-224 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The distribution of type I collagen, fibronectin, laminin, and heparan sulfate was studied in marrow of rats by indirect immunofluorescence. Most of the type I collagen of marrow is associated with large blood vessels and connective tissue trabeculae, but type I collagen was also localized in a delicate meshwork throughout the marrow and in the basement membrane of the sinusoidal endothelium. Fibronectin is partially co-distributed with type I collagen, but is much more widely distributed. Sheets or septa of fibronectin-rich material divide the marrow into small compartments that contain and appear to separate clusters of developing blood cells. These septa may serve as a substrate for anchorage and migration of blood cells. Labeling of laminin was observed in the basement membranes of blood vessels, of fat cells, and of the sinusoidal wall, but only scattered labeling was seen in other extracellular materials. Heparan sulfate proteoglycan was poorly labeled in the extracellular matrix of marrow.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092310210
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  • 3
    Electronic Resource
    Electronic Resource
    Gap junctions between cells of bone marrow: An ultrastructural study using tannic acid (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 196 (1980), S. 101-111 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: In bone marrow of the mouse perfused with fixative containing tannic acid and glutaraldehyde, gap junctions were observed between certain cell types. Gap junctions were seen between adjacent reticular cells, between adjacent macrophages, and between macrophages and reticular cells. Macrophages formed gap junctions with immature neutrophils, eosinophils, monocytes, and erythroblasts. Often a single macrophage had gap junctions with neutrophilic, eosinophilic, and monocytic cells; these blood cells varied from immature to nearly mature forms. In contrast, the macrophages associated with erythroblasts had gap junctions only with erythroblasts and all the erythroblasts were in the same developmental stage. The possible role of the gap junctions in differentiation and mobilization of marrow cells is discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1091960110
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  • 4
    Electronic Resource
    Electronic Resource
    Electron microscopic studies on granulocytopoiesis in the slender salamanderThis investigation was supported by U. S. Public Health Service grant 1 RO1 AM11784-01 through the National Institute of Arthritis and Metabolic Diseases. (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 163 (1969), S. 427-441 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The morphology of differentiating heterophils and eosinophils of the slender salamander, Batrachoseps attenuatus, was studied with electron microscopy. Enzymes of the granules of both cell types appear to arise from the Golgi cisternae. An agranular stem cell was not observed and the least differentiated cell type encountered was an “early” promyelocyte having small granules which are morphologically distinct from mature granules of either the heterophil or eosinophil series. Heterophil myelocytes and later stages contain only one population of granule which is fibrous in content. Eosinophils likewise possess but one type of granule; the granules are larger than those of heterophils, have a homogeneous content, and lack the crystallin core so characteristic of mammalian eosinophils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1091630306
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  • 5
    Electronic Resource
    Electronic Resource
    Intercellular contacts of lymphocytes during migration across high-endothelial venules of lymph nodes. An electron microscopic study (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 207 (1983), S. 643-652 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The migration of lymphocytes across the wall of high-endothelial venules was studied by electron microscopic examination of murine lymph nodes fixed with glutaraldehyde and tannic acid. Regions of close membrane apposition, referred to in the present study as “intercellular contacts,” were observed between migrating lymphocytes and endothelial cells of the vessel wall. At high magnification the intercellular contacts resolve into pentalaminar structures resembling gap junctions. However, the location of these contacts suggests that they are regions of membrane adherence utilized for locomotion of the lymphocytes across the endothelium. At present, it is unclear whether these intercellular contacts are communicating junctions or sites of membrane adherence.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092070413
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  • 6
    Electronic Resource
    Electronic Resource
    Ulrastructure of cytoskeletal element of endothelial and stromal cells of rat marrow (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 227 (1990), S. 152-158 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: This study reports the distribution of microfilaments, microtubules, and intermediate filaments in endothelial cells, reticular cells, and macrophages of bone marrow of rats following fixation with glutaraldehyde, tannic acid, and saponin. In endothelial cells bundles of microfilaments are seen along the basal surface, where these cells adhere to underlying extracellular materials. The reticular cells, especially those that are closely associated with the endothelium of sinusoids, contain many intermediate filaments and microtubules as well as microfilaments. The reticular cell processes that partially cover the endothelium and extend among the blood cells have numerous microtubules and intermediate filaments arranged longitudinally within them; these cytoskeletal elements appear to provide mechanical support for the processes. Macrophages also have many microtubules and intermediate filaments but these organelles do not extend into the thin processes of these cells as is the case with reticular cells. Bundles of microfilaments are observed in the cytoplasm of adventitial and endothelial cells at sites where migrating blood cells are attached to these cells producing local regions of stress.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092270203
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  • 7
    Electronic Resource
    Electronic Resource
    Electron microscopic studies on fate of erythroblast ribosomesThis investigation was supported by U. S. Public Health Service grant 5 R01 AM 11784-05 through the National Institute of Arthritis and Metabolic Diseases. (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 174 (1972), S. 513-519 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Electron microscopic observations are reported which demonstrate that ribosomes are extruded during the final stages of maturation in erythroid cells of rats and guinea pigs. Concentration of ribosomes in the cytoplasm, formation of a membrane bounded vesicle containing these ribosomes and extrusion of the vesicle are described and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1091740410
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  • 8
    Electronic Resource
    Electronic Resource
    Intercellular contacts between migrating blood cells and cells of the sinusoidal wall of bone marrow. An ultrastructural study using tannic acid (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 203 (1982), S. 365-374 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The migration of blood cells across the sinusoidal wall of murine bone marrow was studied following fixation with tannic acid-glutaraldehyde. Electron microscopic examination showed regions of close membrane apposition (referred to in this study as “intercellular contacts”) between migrating blood cells and cells of the sinusoidal wall (adventitial and endothelial cells). Ultrastructurally the intercellular contacts are pentalaminar structures resembling gap junctions of other organs after tannic-acid fixation. The possibility that these contacts are regions of intercellular communication and/or sites of membrane attachment utilized for locomotion of the migrating blood cells is discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092030307
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  • 9
    Electronic Resource
    Electronic Resource
    Ultrastructure of the bone marrow of the frogThis investigation was supported by U. S. Public Health Service grant 1 RO1 AM 11784-02 through the National Institute of Arthritis and Metabolic Diseases. (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 129 (1970), S. 329-355 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The structure of hematopoietic marrow of the frog, Rana pipiens, was studied by electron microscopy. Lining cells of the sinus wall lack a basal lamina and are not phagocytic. Phagocytic cells of the marrow are found free in the lumina of sinuses and in the extravascular tissue. Heterophil leucocytes, during their differentiation, possess a single population of granules; mature granules are elongate bodies having a crystalline content. Eosinophil leucocytes also have a single population of granules; the granules are round and have a homogeneous content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001290306
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  • 10
    Electronic Resource
    Electronic Resource
    Ultrastructural studies of transmural migration of blood cells in the bone marrow of rats, mice and guinea pigsThis investigation was supported by U. S. Public Health Service grant 5 R01 AM 11784-05 through the National Institute of Arthritis and Metabolic Diseases. (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 135 (1972), S. 521-535 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The ultrastructure of bone marrow of rats, mice and guinea pigs was studied after fixation by vascular perfusion. Serial sections were examined to determine the structure and site of pores in lining cells. It was concluded that pores are transient structures occurring only in conjunction with migrating blood cells. These pores occur within lining cells and most frequently near junctions of contiguous lining cells. Microfilaments in lining and adventitial cells are described and their possible roles discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001350406
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