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  • 1
    Electronic Resource
    Electronic Resource
    Development and characterisation of an XeCl excimer laser-generated soft-X-ray plasma source and its applications (1996)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 1241-1255 
    Details
    ISSN: 0392-6737
    Keywords: thermodynamics of plasmas ; Ionizing radiations (ultraviolet, X-rays, γ-rays, ions, electrons, positrons, neutrons, and mesons, etc) ; Biophysical instrumentation and techniques ; X-ray spectra ; PACS 42.55Gp ; Excimer lasers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A large-aperture, long-pulse XeCl excimer laser has been used to generate a soft-X-ray plasma source. Several laser optical configurations have been employed to optimise X-ray emission, including positive-branch unstable resonators and injection by seeding the gain region of the laser with a small commercial excimer laser, resulting in power densities in the range 1012–1014 W cm−2. The characteristics of the plasma source for each different laser configuration and for different target materials are investigated. The most suitable source conditions (spectral energy distribution, time duration, etc.) for specific applications are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453259
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structural Interactions among Epilithic Cyanobacteria and Heterotrophic Microorganisms in Roman Hypogea (1999)
    Springer
    Microbial ecology 38 (1999), S. 244-252 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phototrophic microbial communities present in the Roman Catacombs were characterized and different species of terrestrial epilithic cyanobacteria were found to occur as dominant organisms. Eucapsis, Leptolyngbya, Scytonema, and Fischerella were the most frequently encountered cyanobacterial taxa, while a few species of green algae and the diatom Diadesmis gallica occurred in minor amounts. Streptomyces strains, a few genera of eubacteria, and to a lesser extent fungi were always present in the same microhabitats and contributed to the deterioration of stone surfaces. The combined use of light and electron microscopy evidenced the structural relationships among rod-shaped or filamentous bacteria and cyanobacterial cells, as well as the presence of polysaccharide capsules and sheaths, and of mineral precipitates on S. julianum filaments. The significance of the intimate association among the microorganisms was discussed in relation to the damage caused by the growth of biological patinas on stone surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002489900174
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of photosynthesis on pH variation in cyanobacterial biofilms from Roman catacombs (2000)
    Springer
    Journal of applied phycology 12 (2000), S. 379-384 
    Details
    ISSN: 1573-5176
    Keywords: cyanobacterial biofilms ; Scytonema ; mineral biodeterioration ; pH microelectrodes ; damage diagnosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cyanobacterial biofilms present on stone surfaces inRoman hypogea were studied with the aim of assessingtheir deteriogenic activity on the colonisedsubstrata. In order to achieve this, non-destructivemethods were developed and applied to measure pHvariation induced via photosynthesis and respirationin representative cyanobacteria from Roman catacombs.Amperometric and potentiometric microsensors were alsoused on Scytonema biofilms in culture in orderto measure photosynthesis and assess pH decreases andincreases during dark–light periods. Measurementsof pH showed that, starting with values slightly belowneutral, the pH in Scytonema biofilms increasedby 0.24–0.77 units in the transition from dark to1000 μmol photon m-2 s-1 irradiance.Comparison of photosynthesis and pH curves recordedsimultaneously on the same artificial biofilm showeda maximum increase in pH value at irradiances higherthan those saturating photosynthesis. Alkalinisationof the substrate during illumination occurred to asufficient extent to induce precipitation of mineralcompounds, especially on calcareous substrates such asthose present in Roman hypogea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008149529914
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The taxonomic position of Cyanidium, Cyanidioschyzon and Galdieria: an update (2000)
    Springer
    Hydrobiologia 433 (2000), S. 137-143 
    Details
    ISSN: 1573-5117
    Keywords: Cyanidium caldarium ; Cyanidioschyzon merolae ; Galdieria sulphuraria ; taxonomy ; acidophily
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ecophysiological, cytomorphological, biochemical and molecular data presently available for the acidophilic red algal species Cyanidium caldarium, Cyanidioschyzon merolae and Galdieria sulphuraria are summarised. The taxonomic position of the three genera is discussed and emendements to the generic diagnosis are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004031123806
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    Paper (German National Licenses)
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  • 5
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    Maximum rates of N2 fixation and primary production are out of phase in a developing cyanobacterial bloom in the Baltic Sea (2002)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 47 . pp. 1514-1521.
    Details
    Publication Date: 2018-06-25
    Description: Although N2-fixing cyanobacteria contribute significantly to oceanic sequestration of atmospheric CO2, little is known about how N2 fixation and carbon fixation (primary production) interact in natural populations of marine cyanobacteria. In a developing cyanobacterial bloom in the Baltic Sea, rates of N2 fixation (acetylene reduction) showed both diurnal and longer-term fluctuations. The latter reflected fluctuations in the nitrogen status of the cyanobacterial population and could be correlated with variations in the ratio of acetylene reduced to 15N2 assimilated. The value of this ratio may provide useful information about the release of newly fixed nitrogen by a cyanobacterial population. However, although the diurnal fluctuations in N2 fixation broadly paralleled diurnal fluctuations in carbon fixation, the longer-term fluctuations in these two processes were out of phase.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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