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Csögör, Zsuzsa; Kiessling, Barbara; Perner, Iris; Fleck, Pascale; Posten, Clemens

doi:10.1023/a:1017945513485

Cited by 19 publications

(2 citation statements)

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“…The overall chlorophyll fluorescence per biomass prior to radiation was 17 times lower for P. purpurea. In agreement, a chlorophyll content of 10 mg/gbiomass was determined before for P. purpurea during continuous cultivation [79], while a chlorophyll a and b content of 24.1 mg/gbiomass was described for C. fusca [80]. Additionally, the peak at 725 nm corresponding to photosystem I was not significantly diminished in P. purpurea during the blue light irradiation.…”

Section: Fluorescence Spectra Of High-power Blue Light Laser Irradiat...supporting

confidence: 72%

Antibiotic Effect of High-Power Blue Laser Radiation

Hintmann,

Zimbelmann,

Emde

et al. 2024

Photonics

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The development of sustainable alternatives to chemical and mechanical biofilm removal for submerged technical devices used in freshwater and marine environments represents a major technical challenge. In this context, the antibiotic impact of blue light with its low absorption underwater provides a potentially useful alternative. However, former technical limitations led to hours of treatment. Here, we applied high-power blue laser irradiation (1500 W) with a wavelength of 448 nm to demonstrate its strong antibiotic and algicidal effect on different bacteria and algae in seconds. High-power blue light treatment (139 W/cm2) for only 8.9 s led to the efficient deactivation of all tested organisms. Analyses of the underlying biological mechanisms revealed the absorption of the blue light by endogenous chromophores (flavins, tetrapyrroles) with the generation of reactive oxygen species (ROS). In agreement, Escherichia coli transcriptome analyses demonstrated a stress response at the level of DNA damage repair, respiration, and protein biosynthesis. Spectroscopic measurements of the irradiated algae indicated the irreversible damage of chlorophyll by photooxidation with the formation of singlet oxygen. In conclusion, high-power blue laser radiation provides a strong sustainable tool for the removal of biofouling in a very short time for applications in aquatic systems.

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Section: Fluorescence Spectra Of High-power Blue Light Laser Irradiat...supporting

confidence: 72%

Antibiotic Effect of High-Power Blue Laser Radiation

Hintmann,

Zimbelmann,

Emde

et al. 2024

Photonics

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“…Die Mikroalgen produzieren Polysaccharide in dem Maû, dass sich eine konstante Konzentration einstellt [7]. Dieses Verhalten lässt sich mit Hilfe eines P-Reglers beschreiben.…”

Section: ) Eine Zusammenstellung Der Formelzeichenunclassified

Mathematische Modellierung der einzelligen Mikroalge Porphyridium purpureum

Fleck

Posten

2003

Chemie Ingenieur Technik

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Model-supported optimization of phototrophic growth in a stirred-tank photobioreactor

Franco‐Lara

Havel

Peterat

et al. 2006

Biotechnol. Bioeng.

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A fuzzy-logic light attenuation model was developed and validated for a stirred-tank photobioreactor. Based on this model, local light intensities were used to calculate local specific growth rates of the cyanobacteria Synechococcus PCC 7942. The light regime for maximization of biomass space-time yield in a batch process was estimated using a genetic algorithm taking into account the integral average of the individual growth rates.

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Untitled

Cited by 19 publications

References 20 publications

Antibiotic Effect of High-Power Blue Laser Radiation

Antibiotic Effect of High-Power Blue Laser Radiation

Mathematische Modellierung der einzelligen Mikroalge Porphyridium purpureum

Model-supported optimization of phototrophic growth in a stirred-tank photobioreactor

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