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  • 1
    Electronic Resource
    Electronic Resource
    Effects of streptomycin on plastids in dividing Euglena (1970)
    Springer
    Planta 91 (1970), S. 195-203 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The plastids of dividing Euglena cells growing in the light in the presence of streptomycin decreased in length after a lag period of seven generations. The typical structure of the chloroplast was lost after a similar lag period. This loss of structure did not follow a regular pattern. After 11 generations the plastids resembled normal proplastids of dark-grown cells. Initial chlorophyll loss of treated cells was slow, but after 3 generations the rate of loss was about 0.5/generation, indicating a cessation of synthesis and a dilution among the progeny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385478
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Aspects of structure and photosynthetic competence ofEuglena plastids under conditions of greening and degreening (1975)
    Springer
    Protoplasma 84 (1975), S. 283-295 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Dark-grownEuglena cells were exposed to light at both their late stationary phase of growth (“old cells”), and at their late exponential phase (“young cells”). Chlorophyll accumulation was faster and photosynthetic oxygen evolution was detected earlier in the “young” cells. Photosystem I activity was measured at early stages of greening in both “young” and “old” cells. Rate of activity on a chlorophyll basis at these early stages was 6–7 times higher than the constant levels of the late stages. Photosystem II activity developed with illumination and showed a long lag period in “old” cells. In cells returned from light to dark, after seven generations in the dark, photosystem I was seven times more active on a chlorophyll basis than in light-grown cells. Photosystem II activity inceased up to four generations in the dark and decreased thereafter. Chlorophyll was diluted among progeny, whereas oxygen evolution did not show a similar dilution pattern in the dark. Chloroplasts lost their typical structure and were transformed into proplastids. Prolamellar bodies within the transformed plastids were observed after 2–4 generations in the dark. Non-dividing cells, in contrast to the dividing ones, kept their chlorophyll, their ability to evolve oxygen, and their plastidial structure over long periods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279358
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructural investigation on the alga-fungus relation in pyrenocarpous lichen species (1973)
    Springer
    Protoplasma 78 (1973), S. 187-193 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The fungus-alga relation of pyrenocarpous lichen species has been examined by electron microscopy and compared with the relation in discocarpous species. It was found that the fungus of pyrenocarpous species approaches the alga in a different way than the fungus of the discocarpous species. This difference is independent of the group to which the alga belongs. It is suggested that the mode of contact of the symbionts is determined by the fungal partner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281531
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  • 4
    Electronic Resource
    Electronic Resource
    The development and ultrastructure of lycopene bodies in chromoplasts ofLycopersicum esculentum (1969)
    Springer
    Protoplasma 67 (1969), S. 333-344 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Lycopene bodies are developed in tomato chromoplasts at temperatures permitting synthesis of lycopene. Their appearance seems to be in correlation with the formation of special rigid membranes. These membranes were not observed in chromoplasts of tomatoes ripened at 32
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01254899
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  • 5
    Electronic Resource
    Electronic Resource
    Structural organization of developing chloroplasts inEuglena (1974)
    Springer
    Protoplasma 80 (1974), S. 109-127 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Dark-grownEuglena cells were exposed to light for 0, 6, 12, 24 and 48 hours. At each of these periods samples were taken for chlorophyll determination, measurements of O2 evolution and thin sectioning. For freeze-etching studies, plastids at the various developmental stages were separated on Urografin gradients. The prolamellar body (PLB) in proplastids of dark-grown cells appeared to be composed of membrane sheets having protrusions and depressions. It is suggested that the membranes bounding the loculi of the thylakoids observed in the proplastids are in continuation with the PLB membranes and that the protrusions on the membranes of one side of the loculi are situated against the depressions on the other side. However, the membranes of neighbouring thylakoids are randomly situated and, therefore, the PLB is seen as an unorganized body in thin sections. Particle size distributions were measured on freeze-cleaved thylakoids of plastids at the different stages of development in the light. A shift in particle size was observed from an average diameter of 8 nm in dark-grown cells to 12 nm in cells illuminated for 24 and 48 hours. A probable relation between the occurrence of the larger particles and photosynthetic competence is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01666354
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Visualization of the F9 antigen on sperm from normal and T/t-complex mutants by immunoscanning electron microscopy (1981)
    Chichester [u.a.] : Wiley-Blackwell
    Developmental Genetics 2 (1981), S. 171-183 
    Details
    ISSN: 0192-253X
    Keywords: sperm ; F9 antigen ; T/t-complex ; immunolabeling ; scanning electron microscopy ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The antigens defined by conventional syngeneic antiserum against F9 embryonal carcinoma cells were localized on mature sperm using immunolabeling and scanning electron microscopy. Labeling patterns were compared for normal (+ / +) mice and mice bearing recessive t-haplotypes. The results showed that antigens detected by intact anti-F9 antiserum are expressed similarly in all genotypes, except for sperm from mice bearing the t12-haplotype where the frequency of labeled cells was reduced. Labeling with the IgM fraction of anti-F9 antiserum was lower on sperm from all t-genotypes examined, with sperm from + /t12 males showing the most marked reduction. In all cases, the labeling patterns were similar, and included a labeling of the whole sperm head with complete anti-F9 antiserum and a restriction of the label to the postacrosomal region when the IgM fraction was used.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/dvg.1020020204
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    Paper (German National Licenses)
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