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  • 1970-1974  (7)
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Year
  • 1
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    Unknown
    Sieve-plate pores in tobacco and bean (1970)
    Springer
    Details
    Publication Date: 1970-01-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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    PAPER CURRENT
  • 2
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    Unknown
    Adenosine triphosphatase in the phloem of Cucurbita (1973)
    Springer
    Details
    Publication Date: 1973-01-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    Adenosine triphosphatase in the phloem of Cucurbita (1973)
    Springer
    Planta 110 (1973), S. 189-204 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The distribution of adenosine triphosphatase (ATPase) activity in the phloem of petioles and minor veins of Cucurbita maxima has been studied using a lead phosphate precipitation procedure. ATPase activity was localized in sieve elements, companion cells and parenchyma cells. Activity was found at the cell surfaces, associated with the dispersed P-protein of mature sieve elements, in mitochondria, sieve-element reticulum, and at specific regions of the cell walls. It is suggested that the ATPase at the phloem cell surfaces may function in intercellular transport of assimilates or ions, and that the ATPase activity associated with the P-protein may function in the translocation process or in callose deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387632
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Sieve-plate pores in tobacco and bean (1970)
    Springer
    Planta 91 (1970), S. 173-180 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Tobacco and bean plants were wilted and then fixed as whole plants with formaldehyde-glutaraldehyde for electron microscopy. In some tobacco plants the sieve-plate pores were large, with little callose. Light slime plugs were present, but there was no compaction of P-protein in the pores. Some pores in wilted bean plants were also unplugged. In other plants of both tobacco and bean the sieve-plate pores were plugged. The pores in unwilted control plants of both tobacco and bean were invariably plugged. Tobacco plants were also cut into thin slices and then immediately fixed. In specimens prepared in this way there was little callose in the pores, and many of the pores were not plugged with P-protein. These observations provide additional evidence that sieve-plate pores may be unplugged in vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385475
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Surface of the cuticle on the aesthetascs ofCancer (1970)
    Springer
    Protoplasma 69 (1970), S. 145-150 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276656
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Development of the capillitium inPerichaena vermicularis A plasmodial slime mold (1974)
    Springer
    Protoplasma 80 (1974), S. 207-221 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Development of the capillitium ofPerichaena vermicularis has been examined using light and electron microscopy. Two mechanisms are involved in the production of the thread-like structures. Initiation of capillitial development begins with the formation of long rows of vacuoles throughout the previous undifferentiated protoplasm of young plasmodiocarp. A homogeneous layer of amorphous material referred to as the cortical layer surrounds the vacuoles. Arrays of microtubules are present directly outside the cortical layer and apparently serve as a framework for the formation of the vacuolar system in which capillitial walls develop. Simultaneously, invaginations of the plasma membrane result in development of additional tubes in which capillitial threads are secreted.E. coli are embedded in the layer of slime which covers the invagination and once again a cortical layer is present directly beneath the invagination of the plasma membrane. After the tubular vacuolar system is formed, walls are secreted inside the tubes; vesicles are apparently involved in wall formation. Some of the mature capillitial threads are filled withE. coli. The results suggest the hollow capillitial tubes containing slime and other debris are an excellent environment for the growth and multiplication ofE. coli in cultures of Myxomycetes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01666360
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  • 7
    Electronic Resource
    Electronic Resource
    Ultrastructure of the plasmodial slime moldPerichaena vermicularis (1973)
    Springer
    Protoplasma 78 (1973), S. 1-19 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The development of the peridium ofPerichaena vermicularis has been examined using light and electron microscopy and acid phosphatase localization. A newly formed fruiting body consists of undifferentiated protoplasm which is enveloped by a slime coat. Almost immediately after formation of the plasmodiocarp, the protoplasm differentiates into autolytic and fruiting regions. The autolytic region is located at irregular intervals between the slime coat and the fruiting region and separated from both of them by membranes. Soon after the autolytic region has formed, additional signs of degeneration appear in the autolytic region including unusual appearance of nuclei, increase in autophagic vacuoles, and the presence of clear areas in the ground substance. The plasma membrane, which once completely separated the slime coat from the autolytic region, is no longer continuous. Electron micrographs of the autolytic region from later developmental stages show formation of extensive channels which contain protoplasm in various stages of degradation. Acid phosphatase is present in the channels of the autolytic region. The morphological evidence and the presence of hydrolytic enzyme suggest the region is being digested and re-adsorbed. After the autolytic region has been digested, an even layer of peridial wall material is laid down, and at regular intervals additional wall material is produced. The additional wall material forms the reticulation on the inside of the peridial wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281519
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    Paper (German National Licenses)
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