15 Result(s)
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Article
15N photo-CIDNP MAS NMR on both photosystems and magnetic field-dependent 13C photo-CIDNP MAS NMR in photosystem II of the diatom Phaeodactylum tricornutum
Diatoms contribute about 20–25% to the global marine productivity and are successful autotrophic players in all aquatic ecosystems, which raises the question whether this performance is caused by differences i...
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Article
Unusual features of the high light acclimation of Chromera velia
In the present study, the high light (HL) acclimation of Chromera velia (Chromerida) was studied. HL-grown cells exhibited an increased cell volume and dry weight compared to cells grown at medium light (ML). The...
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Article
Influence of pH, Mg2+, and lipid composition on the aggregation state of the diatom FCP in comparison to the LHCII of vascular plants
In the present study, the influence of Mg2+ ions and low pH values on the aggregation state of the diatom FCP and the LHCII of vascular plants was studied. In addition, the concentration of thylakoid membrane lip...
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Chapter and Conference Paper
Effect of Lipids on Violaxanthin and Diadinoxanthin De-Epoxidation
Violaxanthin (Vx) and diadinoxanthin (Ddx) de-epoxidation are light dependent steps in one of the most important photoprotecting processes called respectively violaxanthin and diadinoxanthin cycle. Violaxanthi...
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Article
Molecular dynamics of the diatom thylakoid membrane under different light conditions
During the last years significant progress was achieved in unraveling molecular characteristics of the thylakoid membrane of different diatoms. With the present review it is intended to summarize the current k...
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Article
Regulation and function of xanthophyll cycle-dependent photoprotection in algae
The xanthophyll cycle represents one of the important photoprotection mechanisms in plant cells. In the present review, we summarize current knowledge about the violaxanthin cycle of vascular plants, green and...
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Article
Structurally flexible macro-organization of the pigment–protein complexes of the diatom Phaeodactylum tricornutum
By means of circular dichroism (CD) spectroscopy, we have characterized the organization of the photosynthetic complexes of the diatom Phaeodactylum tricornutum at different levels of structural complexity: in in...
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Chapter and Conference Paper
The Oligomeric Antenna of the Diatom P. tricornutum — Localisation of Diadinoxanthin Cycle Pigments
In the present work a thorough examination of the oligomeric antenna of P. tricornutum was performed. Solubilisation of thylakoids with n-dodecyl β-d-maltoside in combination with gelfiltration and sucrose densit...
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Chapter and Conference Paper
Evidence for a Fast, Xanthophyll Cycle Independent NPQ Mechanism in the Diatom C. meneghiniana
for the diatom Phaeodactylum tricornutum it was reported that non-photochemical quenching (NPQ) strictly depends on the de-epoxidation state of the xanthophyll cycle (XC) pigment pool. In our present study we sho...
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Article
Light regulation of carotenoid biosynthesis in the prasinophycean alga Mantoniella squamata
We have studied carotenoid biosynthesis in the prasinophycean alga Mantoniella squamata, which contains a great variety of carotenoids belonging to both the a- and the ß-carotene (Car) biosyntheses pathways. This...
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Article
Non-photochemical chlorophyll fluorescence quenching and structural rearrangements induced by low pH in intact cells of Chlorella fusca (Chlorophyceae) and Mantoniella squamata (Prasinophyceae)
We have used circular dichroism (CD) spectroscopy and chlorophyll fluorescence induction measurements in order to examine low-pH-induced changes in the chiral macro-organization of the chromophores and in the ...
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Article
Stimulation of the diadinoxanthin cycle by UV-B radiation in the diatom Phaeodactylum tricornutum
In this study we show that the diadinoxanthin cycle in the diatom Phaeodactylum tricornutum is stimulated by mild UV-B radiation. High steady state concentrations of diatoxanthin established during a period of...
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Chapter
In Mantoniella Squamata Deepoxidized Xanthophyll Cycle Pigments Show a Tighter Pigment Protein Coupling than the Respective Epoxidized Forms
The prasinophycean alga Mantoniella squamata uses in vivo an incomplete violaxanthin cycle with antheraxanthin accumulating during periods of strong illumination (1). Antheraxanthin enhances thermal dissipation o...
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Chapter
Multiple Short Term Effects of UV-B Radiation on the Diatom Phaeodactylum Tricornutum
Increases in UV-B irradiance lead to many specific damaging effects upon the plants including damage of the thylakoid membrane, partial inhibition of PS II, decrease of chloroplast ATPase activity, loss of enz...
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Chapter
Picosecond Time Resolved Analysis of the Fast and Slow Reversible Non-Photochemical Chlorophyll Fluorescence Quenching
Photosystem II, which is a potential target of adverse effects of supersaturating light, is strongly dependent on a mechanism, which allows to switch over between efficient photochemical energy conversion at l...
