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  • 81.60  (1)
  • L. diplococca  (1)
  • 1985-1989  (2)
  • 1965-1969
  • 1925-1929
  • 1987  (2)
Collection
Keywords
Publisher
Years
  • 1985-1989  (2)
  • 1965-1969
  • 1925-1929
Year
  • 1987  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Surface chemistry of Zn3P3 single crystals studied by XPS (1987)
    Springer
    Applied physics 43 (1987), S. 197-201 
    Details
    ISSN: 1432-0649
    Keywords: 81.60 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract X-ray photoemission spectroscopy (XPS) has been used to study the surface reaction of Zn3P2 single crystals. The spectra of crystals exposed to H2, O2, CO2, O2+H2O or CO2+H2O during a four week period were compared to the spectra of as-grown or in UHV scraped samples. For samples contaminated with the wet gases O2+H2O and CO2+H2O additional phosphorus core levels together with a shift of the zinc core levels were observed. For crystals exposed to atmosphere during several months no phosphorus could be detected on the gasgrown surface, whereas the stochiometry of Zn3P2 was maintained within the bulk. Crystals with scraped surfaces showed no moisture sensitivity. No surface contamination was also detected for Zn3P2 crystals deposited with up to 1000 L H2O or exposed to atmosphere during 30 min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695623
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  • 2
    Electronic Resource
    Electronic Resource
    Drei parasitische Flechten aufCaloplaca polycarpoides (1987)
    Springer
    Plant systematics and evolution 155 (1987), S. 133-141 
    Details
    ISSN: 1615-6110
    Keywords: Lichens ; Caloplaca polycarpoides ; Lecania triseptata ; L. diplococca ; Rinodina afghanica ; New taxa of parasitical lichens ; morphology ; Flora of Afghanistan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract No less than 3 different parasitical lichens were found on the corticolous lichenCaloplaca polycarpoides in Afghanistan. Partly, they also grow on closely allied species of the sect.Xanthoriella. Lecania triseptata begins and ends as a typical parasite, and does not form a thallus outside of its host.L. diplococca andRinodina afghanica, both described as new species, have a similar appearance; they are parasitic in the beginning, but form their own thalli outside the host later on. The 3 species are members of the small group of parasitical lichens growing on corticolous hosts. Possibly, the slow degeneration of cortices under the arid climatical conditions, has allowed the evolution of parasitic lichens of this rare type in Central Asia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936295
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