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  • Articles  (46)
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  • Articles  (46)
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  • 1
    Electronic Resource
    Electronic Resource
    Structural and photochemical properties of Rhodopseudomonas palustris subchromatophore particles obtained by treatment with triton X-100 (1968)
    s.l. : American Chemical Society
    Biochemistry 7 (1968), S. 319-325 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00841a040
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  • 2
    Electronic Resource
    Electronic Resource
    Structural and photochemical properties of Rhodopseudomonas species NHTC 133 subchromatophore particles obtained by treatment with Triton X-100 (1968)
    s.l. : American Chemical Society
    Biochemistry 7 (1968), S. 326-332 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00841a041
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  • 3
    Electronic Resource
    Electronic Resource
    Active swelling and acetate uptake in corn mitochondria (1969)
    s.l. : American Chemical Society
    Biochemistry 8 (1969), S. 1203-1213 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00831a055
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  • 4
    Electronic Resource
    Electronic Resource
    Golgi apparatus mediated polysaccharide secretion by outer root cap cells of Zea mays (1967)
    Springer
    Planta 74 (1967), S. 286-301 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In the outer cap cells of roots of Zea mays, secretion is accompanied by hypertrophy of dictyosome cisternae with formation of large secretory vesicles. Vesicle contents are subsequently released from the protoplast by fusion of the vesicle membrane with the plasma membrane. The secreted material, a highly hydrated polysaccharide, was localized intracellularly by the periodic acid-Schiff reaction. Under appropriate conditions, the product moves outward through the cell wall after discharge from the protoplast, and appears as a droplet adhering to the root tip. Under conditions where the secretory product accumulates at the inner wall surfaces, no external droplet is formed. The secretory activity has an active phase that is sensitive to metabolic inhibitors and influenced by temperature (Q10〉2), and a passive phase that is independent of temperature, insensitive to metabolic inhibitors but sensitive to osmotic agents. The active phase is characterized by a temperature-independent periodicity (3 hours). Sucrose supplied to the growth medium increases the amount of polysaccharide secreted. Polysaccharide synthesis, segregation into vesicles, and discharge from the protoplast are assumed to require active metabolism; the step involving extrusion of polysaccharide through the cell wall region appears to be a passive process influenced by the degree of hydration of the polysaccharide and by cell turgor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384849
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  • 5
    Electronic Resource
    Electronic Resource
    Dictyosome-like structures from guinea-pig testes lack galactosyltransferase, a Golgi apparatus marker (1985)
    Springer
    Cell & tissue research 240 (1985), S. 35-40 
    Details
    ISSN: 1432-0878
    Keywords: Dictyosome-like structures ; Galactosyltrans-ferase ; Golgi apparatus ; Testis ; Guinea pig
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary More than twenty different enzyme activities of fractions containing dictyosome-like structures (DLS) as a dominant cell component were monitored. Plasma membrane vesicles were a major contaminant of the DLS fractions, which, presumably as a consequence, were enriched somewhat in plasma membrane markers. The lysosomal enzymes arylsulfatase and latent acid phosphatase were present in the DLS fractions as were the Golgi apparatus activities thiamine pyrophosphatase and nucleoside diphosphatase. The presence of the latter two enzymes in DLS, plus NADH-ferricyanide reductase, has been verified from cytochemistry. On the other hand, the Golgi apparatus marker, galactosyltransferase, was not enriched in DLS fractions and appeared to be absent. This latter finding, verified from cytochemistry with isolated DLS fractions and, in situ, from [3H]galactose incorporation by testis tubules with analysis by autoradiography, provides the first clear biochemical characteristic that serves unequivocally to distinguish DLS from conventional Golgi apparatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217555
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  • 6
    Electronic Resource
    Electronic Resource
    Laminated figures of the intercisternal regions of dictyosome-like structures from guinea-pig spermatocytes fixed with glutaraldehyde-tannic acid (1983)
    Springer
    Cell & tissue research 234 (1983), S. 633-639 
    Details
    ISSN: 1432-0878
    Keywords: Dictyosome-like structures ; Golgi apparatus ; Phosphatidylcholine ; Laminated figures ; Electron microscopy ; Guinea pig
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Dictyosome-like structures (DLS) of guinea pig spermatocytes, when prefixed in mixtures of glutaraldehyde and tannic acid, exhibited laminated figures with a repeating periodicity of about 4.5 nm in the spaces between DLS saccules or in association with the surfaces of the DLS saccules. These laminated figures were similar to those figures derived from saturated lipids in other tissues. Alternatively, spaces between saccules were collapsed leaving only thin, electron-dense material separating adjacent saccules. These changes were not observed when the DLS were prefixed in glutaraldehyde before exposure to tannic acid. The presence of laminated figures following fixation with tannic acid and osmium tetroxide suggests that saturated lipids are present in, or associated with, the intersaccular regions of the DLS. The distribution of laminated figures in other membrane structures was not affected by post fixation with tannic acid nor were laminated figures comparable to those of the DLS observed between cisternae of the Golgi apparatus. These results support previous conclusions that DLS are distinct from Golgi apparatus and are a unique component of the germ cell cytoplasm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218656
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  • 7
    Electronic Resource
    Electronic Resource
    Cytochalasin B, but not colchicine, inhibits migration of secretory vesicles in root tips of maize (1976)
    Springer
    Protoplasma 87 (1976), S. 39-48 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The effects of colchicine and cytochalasin B on the structure of dictyosomes of maize root tips were studied. Colchicine did not significantly affect dictyosome structure or change the distribution of dictyosome-derived secretory vesicles. Cytochalasin B did not significantly change dictyosome structure or intercisternal fibers, but did alter markedly the distribution of the secretory vesicles in both the epidermal and outer cap cells. With cytochalasin B, the vesicles accumulated in a region close to their site of formation and did not migrate to the cell surface. The results show that a cytochalasin B-sensitive subcellular component is involved in the vectorial movement of secretory vesicles from sites of formation at dictyosomes to sites of fusion at the cell surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01623957
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  • 8
    Electronic Resource
    Electronic Resource
    Intercisternal substances of the Golgi apparatus (1973)
    Springer
    Protoplasma 78 (1973), S. 443-459 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In media of high ionic strength, neutral pH, low temperature, and varying ion composition, plant dictyosomes were disassembled into component cisternae. The effective ions included phosphotungstate and several halides. Constituents of the intercisternal or bonding regions were revealed through electron microscope analysis. These included intercisternal elements and electrontransparent plaques of undetermined composition. The intercisternal plaques were confined to the central platelike regions of cisternae and were distinct from the intercisternal fibers. The findings demonstrate that plant dictyosomes can be dissociated into component cisternae. With monovalent halide salts, the unstacking process was sufficiently mild to reveal constituents of the intercisternal region as well as yield intact single cisternae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01275779
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  • 9
    Electronic Resource
    Electronic Resource
    The fine structure of mucilage secreting cells ofHibiscus esculentus pods (1967)
    Springer
    Protoplasma 63 (1967), S. 353-362 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Large secretory cells are found in the pericarp of okra capsules. In early developmental stages these cells are conspicuous because of the great quantity of Golgi apparatus-derived, PAS positive substance stored between the protoplast and the cell wall. It is suggested that these cells may play a major role in the formation of okra mucilage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01252945
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  • 10
    Electronic Resource
    Electronic Resource
    An ultrastructural study of the leukocytes of the channel catfish, Ictalurus punctatus (1980)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 164 (1980), S. 1-23 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Ultrastructural studies on blood leukocytes of the channel catfish, Ictalurus punctatus, show the presence of heterophils (neutrophils), small lymphocytes, monocytes, and thrombocytes. Monocytes cannot always be distinguished from large lymphocytes. Cells resembling macrophages or transitional forms between monocytes and macrophages are occasionally seen. Blood eosinophils and basophils are not found. Thrombocytes and small lymphocytes are the most abundant leukocytes, while monocytes are the least frequently encountered leukocyte. Glycogen, present in all leukocytes, is most abundant in heterophils and least abundant in monocytes. Although monocytes are similar to heterophils in size and shape, a greater amount of rough endoplasmic reticulum, free ribosomes, and fewer granules are observed in monocytes. Heterophils possess oval or elongate granules, which often contain a crystalline or striated structure; small tubules which resemble smooth endoplasmic reticulum, and cristae which traverse the long axes of the mitochondria are frequently seen. Small lymphocytes are characterized by the presence of pseudopodia, many free ribosomes, numerous large mitochondria, dictyosomes (Golgi), and long profiles of rough endoplasmic reticulum. The dictyosomes are often associated with a large zone of exclusion. Bundles of microtubules are observed near the elongated ends of thrombocytes. Deep indentations of the plasmalemma, which give the appearance of vacuoles, are also seen in thrombocytes.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051640102
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