Bacteriorhodopsin-based multi-level optical security features

Hampp, Norbert; Neebe, Martin

doi:10.1117/12.642627

Cited by 3 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…BR is the only known nonchlorophyll structure that allows photosynthesis [1] . It is currently being developed for applications in optical security [2] , optical data storage [3] , and holography [4] . Accordingly, H. salinarum 's photosynthetic capabilities are its most well-studied aspects.…”

Section: Introductionmentioning

confidence: 99%

Systems Analysis of Bioenergetics and Growth of the Extreme Halophile Halobacterium salinarum

et al. 2009

View full text Add to dashboard Cite

Halobacterium salinarum is a bioenergetically flexible, halophilic microorganism that can generate energy by respiration, photosynthesis, and the fermentation of arginine. In a previous study, using a genome-scale metabolic model, we have shown that the archaeon unexpectedly degrades essential amino acids under aerobic conditions, a behavior that can lead to the termination of growth earlier than necessary. Here, we further integratively investigate energy generation, nutrient utilization, and biomass production using an extended methodology that accounts for dynamically changing transport patterns, including those that arise from interactions among the supplied metabolites. Moreover, we widen the scope of our analysis to include phototrophic conditions to explore the interplay between different bioenergetic modes. Surprisingly, we found that cells also degrade essential amino acids even during phototropy, when energy should already be abundant. We also found that under both conditions considerable amounts of nutrients that were taken up were neither incorporated into the biomass nor used as respiratory substrates, implying the considerable production and accumulation of several metabolites in the medium. Some of these are likely the products of forms of overflow metabolism. In addition, our results also show that arginine fermentation, contrary to what is typically assumed, occurs simultaneously with respiration and photosynthesis and can contribute energy in levels that are comparable to the primary bioenergetic modes, if not more. These findings portray a picture that the organism takes an approach toward growth that favors the here and now, even at the cost of longer-term concerns. We believe that the seemingly “greedy” behavior exhibited actually consists of adaptations by the organism to its natural environments, where nutrients are not only irregularly available but may altogether be absent for extended periods that may span several years. Such a setting probably predisposed the cells to grow as much as possible when the conditions become favorable.

show abstract

Section: Introductionmentioning

confidence: 99%

Systems Analysis of Bioenergetics and Growth of the Extreme Halophile Halobacterium salinarum

et al. 2009

View full text Add to dashboard Cite

show abstract

“…In addition to uncommon pathways, H. salinarum also received much interest as it is the key organism for producing bacteriorhodopsin, which is currently the only known structure that allows non-chlorophyll based photosynthesis. Bacteriorhodopsin is currently being developed for applications in optical security, 7 optical data storage, 8 and the creation of holograms. 9 H. salinarum is also one of the few reported organisms which can use large potassium gradients in a battery like manner to serve as long term energy storage.…”

Section: Introductionmentioning

confidence: 99%