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  • Articles  (37)
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  • 1
    facet.materialart.
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  15. Deutscher Kongress für Versorgungsforschung; 20161005-20161007; Berlin; DOCP130 /20160928/
    Publication Date: 2016-09-28
    Keywords: ddc: 610
    Language: English
    Type: conferenceObject
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  • 2
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  17. Deutscher Kongress für Versorgungsforschung (DKVF); 20181010-20181012; Berlin; DOC18dkvf205 /20181012/
    Publication Date: 2018-10-13
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 3
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  17. Deutscher Kongress für Versorgungsforschung (DKVF); 20181010-20181012; Berlin; DOC18dkvf150 /20181012/
    Publication Date: 2018-10-13
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Aquatic ecology 10 (1976), S. 37-39 
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 97 (1978), S. 275-290 
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The meiospore ofPhysoderma maydis (Phycomycetes, Chytridiales, Physodermataceae) has a nuclear cap enclosing the cellular ribosomes within a double membrane, and double membranes traversing the nuclear cap. Aggregates of ribosomes not incorporated into the nuclear cap are also enclosed by double membranes. A vesicular network is observed in the anterior portion of the spore in direct connection with the nuclear cap membrane and with a stacked parallel array of membranes, which itself is connected with the nuclear cap membrane. The meiospore ofP. maydis contains a side body complex of the type observed in spores of theBlastocladiales. Vesicles enclose the side body complex and these vesicles are connected to the nuclear cap membrane and the nuclear envelope, and form a network which partially encloses the kinetosomal apparatus. The nuclear cap membrane, stacked array of membranes, and the vesicles which surround the side body complex and the kinetosomal apparatus contain an electron-dense amorphous material. On the basis of their ultrastructural appearance, these membranes are interpreted as part of a highly divided microbody. The ultrastructural organization of the meiospore ofP. maydis is compared to the structural organization observed in spores of theChytridiales, Blastocladiales, Monoblepharidales, andHarpochytriales. It is concluded that the structural organization of the meiospores ofP. maydis is the same as observed for members of theBlastocladiales, and it is suggested that thePhysodermataceae should be transferred from theChytridiales to theBlastocladiales.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 106 (1981), S. 69-82 
    ISSN: 1615-6102
    Keywords: Fungus ; Parasite ; Potato wart disease ; Resting sporangia ; Synchytrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The cytoplasmic organization of the long-lived, thick walled resting stage of the sporangium ofSynchytrium endobioticum (Schilb.) Perc. is described. The cytoplasm of the resting sporangium contains a large number of closely packed lipid bodies and irregular electron dense bodies, which are interspaced with fine channels of cytoplasm. These ultrastructural observations are discussed in relation to the hypothesis ofBally (1912) andCurtis (1921) that zoospore primordia are already present during the resting stage. It is shown that the “zoospore primordium” is actually a lipid body and an osmiophilic body and the strands postulated to connect the individual “zoospore primordia” are actually the fine channels of cytoplasm. A new inner wall layer is laid down prior to the start of the germination. It is this wall layer which will protrude to form the vesicle in which sporogenesis takes place. The germination process observed, protrusion of a vesicle through a crack in the sporangial wall, the migration of the sporangial content into the vesicle, and the formation of a single, membrane-bound sporangium within this vesicle, is in full agreement with the recent light microscopic studies ofSharma andCammack (1976). These observations support the transfer ofS. endobioticum from the subgenusMesochytrium to the subgenusMicrosynchytrium (bothsensu Karling 1964). A major objective of the study, to obtain ultrastructural evidence for the location of the meiotic divisions in the life cycle, was not fulfilled. Three different fungi were observed to parasitize the resting sporangium ofS. endobioticum. These infections are discussed in relation to other mycoparasites of plant pathogenic fungi. The possibility of using a mycoparasite for the biological control of potato wart disease is considered to be without practical relevance.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1615-6102
    Keywords: Fungus ; Parasite ; Potato ; Potato wart disease ; Resting sporangium ; Synchytrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An ultrastructural study of the development of the resting sporangium ofSynchytrium endobioticum (Schilb.) Perc. infecting potato cells is presented. The resting sporangium is found to have a single large, centrally placed nucleus with a prominent nucleolus through its entirein situ development. The cytoplasmic organization of the resting sporangium is further characterized by numerous membrane-bound lipid bodies and osmiophilic bodies. The latter have a characteristic sieve-like appearance, probably because certain storage components have been extracted during preparation for electron microscopy. Because of the similar location and appearance of these osmiophilic bodies it is suggested that they are identical to what has earlier (based on light microscopy) been described as chromatin granules; and the ultrastructural studies presented here show that “nucleolar discharge” which was described from light microscopic observations as leading to chromatin granules in the cytoplasm, and finally forming the nuclei of the zoospores (bally 1912,curtis 1921,percival 1910) simply does not occur. The appearance of dense fibrillar-like structures on the sporangial surface at an early stage of resting sporangium development ultrastructurally distinguishes the resting sporangium from the zoosporangium. The development of the layered portion of the thick sporangial wall is shown to be due to the fusion of vacuoles containing pre-made wall fibrils with the cell membrane. It is suggested that the inner compact wall layer which is essentially substructureless is formed by the membrane itself. The characteristic “wings” of the matureS. endobioticum resting sporangium originate from the potato host cell wall. Remnants of host cell organelles in the outermost layer of the resting sporangium wall show that degradation of the host cell cytoplasm contributes to wall formation of the parasite.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1615-6102
    Keywords: Fungus ; Parasite ; Potato ; Potato wart disease ; Synchytrium ; Zoosporangium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An ultrastructural study of zoosporangium development ofSynchytrium, endobioticum (Schilb.) Perc. is presented. Emphasis is placed on the location of the parasitic fungal thallus in the potato host cell, on the specific location of organelles in relation to the developing zoosporangial wall, and on the host cell reaction to the fungal infection. The cytoplasmic organization of the individual sporangia after division of the zoosporangium into a sorus of sporangia is characterized by numerous similarly sized nuclei, well developed dictyosomes, and the presence of many lipid bodies of variable size. Cytoplasmic microtubules are observed to flare out from the functional kinetosome both before and after zoospore cleavage. The ultrastructural details of zoosporangium development are used to revaluate the life cycle ofS. endobioticum as described from light microscopic observations made early in the century (Curtis 1921;Köhler 1923, 1932;Percival 1910).
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1437-1596
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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