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  • 1995-1999  (2)
  • 1997  (2)
  • Key words Gene transfer  (1)
  • PACS: 78.70.Bj; 61.80.-x  (1)
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  • 1995-1999  (2)
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  • 1997  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Damage depth-profiling of Au+ and O+-irradiated amorphous PEEK by monoenergetic positron beams (1997)
    Springer
    Applied physics 64 (1997), S. 491-495 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 78.70.Bj; 61.80.-x
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: + and O+ ions was exposed to positron beams to measure the positron annihilation Doppler broadening as a function of the positron energy. As in the previous case of O+-irradiated semicrystalline PEEK, the annihilation lines recorded at relatively low positron energies became broader with increasing irradiation dose. The thickness of the damaged layer estimated from the positron data was compared with the mean depth of the implanted ions calculated by the TRIM code. For the Au+-irradiated samples, some discrepancy was observed between the two quantities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050507
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Interorganellar gene transfer in bryophytes: the functional nad7 gene is nuclear encoded in Marchantia polymorpha (1997)
    Springer
    Molecular genetics and genomics 256 (1997), S. 589-592 
    Details
    ISSN: 1617-4623
    Keywords: Key words Gene transfer ; NADH: ubiquinone oxidoreductase ; Liverwort ; Signal peptide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The nad7 gene, encoding subunit 7 of NADH dehydrogenase, is mitochondrially encoded in seed plants. In the liverwort, Marchantia polymorpha, only a pseudogene is located in the mitochondrial genome. We have now identified the functional nad7 gene copy in the nuclear genome of Marchantia, coding for a polypeptide of 468 amino acids. The nuclear-encoded nad7 has lost the two group II introns present in the mitochondrial pseudogene copy. Instead, a typical nuclear intron is found to split an exon encoding the presumptive mitochondrial targeting signal peptide and the mature subunit 7 of NADH dehydrogenase. These results suggest that RNA-mediated gene transfer from the mitochondrial into the nuclear genome occurs not only in seed plants but also in bryophytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00008616
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    Paper (German National Licenses)
    Fulltext
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