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  • 1
    Electronic Resource
    Electronic Resource
    Effect of turbulence and inorganic carbon supply on growth ofDunaliella viridis Teodoresco (1995)
    Springer
    International journal of salt lake research 4 (1995), S. 223-232 
    Details
    ISSN: 1573-8590
    Keywords: Dunaliella viridis ; subsidiary energy ; turbulence ; carbon supply ; photosynthetic efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract Turbulence is known to enhance growth in microalgae. We studied the possible effects of the extra inorganic carbon supplied to the cultures when air bubbling is the source of turbulence. A set of experiments was carried out to separate the effects of the subsidiary action of agitation on growth from those due to possible carbon enrichment from air CO2 when air bubbling was the source of mixing. It was found that air bubbling does not induce an increase of the concentration of inorganic carbon in HCO 3 − -enriched growth media, and that no differences appear between air-bubbled and CO2-free air-bubbled cultures. On the other hand, photosynthetic O2 was accumulated in the medium in non-mixed cultures, which showed higher respiration and lower photosynthetic rates, probably due to photoinhibition induced by oversaturation of O2. Growth rate, maximal cell density and photosynthetic efficiency were higher in aerated cultures than in non-aerated ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02001492
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of different levels of CO2 on photosynthesis and cell components of the red alga Porphyra leucosticta (1999)
    Springer
    Journal of applied phycology 11 (1999), S. 455-461 
    Details
    ISSN: 1573-5176
    Keywords: CO2 ; inorganic carbon ; macroalgae ; photosynthesis ; PAM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthesis and cell composition of Porphyraleucosticta discs grown at low (〈 0.0001% in air), current (control) and high (1% CO2 in air)inorganic carbon (Ci) concentrations were analyzed. Carbohydrate content in discs grown at high Ci increased (15.1 mg g-1 FW) with respect to the control (6.4 mg g FW-1), whereas soluble protein content decreased to one-third (5.6 to2.1 mg g-1 FW). Carbohydrate content was unaffected and soluble protein slightly increased in discs grown at low Ci. As a consequence of these changes, a lower C/N molar ratio (8.6) was found in the discs grown at low compared to high Ci(12.4). Nitrate reductase activity increased at high Ci from 0.3 ± 0.2 to 1.7 ± 0.4 μmolNO2 - g-1 FW h-1indicating that reduction and assimilation of nitrate were uncoupled. The response of photosynthesis to increasing irradiance, estimated from O2evolution vs. irradiance curves, was affected by the treatments. Maximum quantum yield (Φ O2°) and effective quantum yield (Φ O2) at 150 μmol photon m-2s-1 decreased by 20% and 50%, respectively, at low Ci. These differences could be due to changes in photosynthetic electron flow between PSII and PSI. Treatments also produced changes in maximal (Fv/Fm) and effective (ΔF/Fm′)quantum yield for photosystem II charge separation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008194223558
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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