Publications by authors named "P Waldeck"

Article Synopsis
  • The study investigates how different nitrate levels affect the growth and nutritional composition of the microalgae Arthrospira platensis (Spirulina).
  • It finds that higher nitrogen levels result in significantly greater concentrations of phycocyanin, a valuable pigment, and affects the cytotoxicity of the algae's extracts on various mammalian cell lines.
  • The results indicate that Spirulina extracts are more toxic to tumor cells compared to non-tumor cells and highlight the importance of nutrient management in Spirulina cultivation.
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The growth of cyanobacteria can vary considerably depending on the ambient temperature. Since the optimal growth temperature for Arthrospira platensis (strain SAG21.99) is not yet known, this was investigated in the present study.

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The cyanobacterium () is a natural source of considerable amounts of ingredients that are relevant for nutra- and pharmaceutical uses. Different hydrophilic and hydrophobic substances can be obtained by extraction from the biomass. The respective extraction techniques determine the composition of substances in the extract and thus its biological activity.

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Light-emitting diodes (LED) can be utilized as tailorable artificial light sources for the cultivation of cyanobacteria such as Arthrospira platensis (AP). To study the influence of different LED light colors on phototrophic growth and biomass composition, AP was cultured in closed bioreactors and exposed to red, green, blue, or white LED lights. The illumination with red LED light resulted in the highest cell growth and highest cell densities compared to all other light sources (order of cell densities: red > white > green > blue LED light).

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(AP) is a cyanobacterium with a high economic value and is nowadays one of the most important industrially cultivated microalgae. Knowledge of its growth is essential for the understanding of its physiology and yield. The growth of AP biomass occurs through two mechanisms: (1) propagation by fragmentation of trichomes, and (2) the trichomes are extended by binary fission until they reach their mature status.

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