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  • 1
    Keywords: Botanical chemistry. ; Plant Biochemistry.
    Description / Table of Contents: Part 1. Introductory Chapters -- Chapter 1. Recent Advances in the Photosynthesis of Cyanobacteria and Eukaryotic -- Chapter 2. The Algal Tree of Life from a Genomics Perspective -- Part 2. Molecular Genetics Of Algae -- Chapter 3. Chlorophyll-Xanthophyll Antenna Complexes: in between Light Harvesting and Energy Dissipation -- Chapter 4. The Dynamics of the Photosynthetic Apparatus in Algae -- Chapter 5. Biosynthesis of Chlorophyll and Bilins and Assembly of the Photosynthetic Apparatus -- Part 3. Biochemistry and Physiology of Algae -- Chapter 6. Chloroplast Ion and Metabolite Transport in Algae -- Chapter 7. Structural and Biochemical Features of Carbon Acquisition in Algae -- Chapter 8. Light-Driven Oxygen Consumption in the Water-Water Cycles and Photorespiration, and Light Stimulated Mitochondrial Respiration -- Chapter 9. The Algal Pyrenoid -- Part 4. Light-Harvesting Systems in Algae -- Chapter 10. Light-Harvesting in Cyanobacteria and Eukaryotic Algae; An Overview -- Chapter 11. Light Harvesting by Long-Wavelegth Chlorophyll Forms (Red Forms) in Algae: Focus on their Presence, Distribution and Formation -- Chapter 12. Diversity in Photoprotection and Energy Balancing in Terrestrial and Aquatic Phototrophs -- Chapter 13. Photoinhibition in Algae -- Chapter 14. Modulating Energy Transfer from Phycobilisomes to Photosystems: State transitions and OCP-related Non-Photochemical Quenching -- Chapter 15. Coherent Processes in Photosynthetic Energy Transport and Transduction -- Chapter 16. Light Harvesting Complexes of Diatoms – Fucoxanthin Chlorophyll. Proteins -- Chapter 17. Symbiodinium, Corals and Coral Bleaching. .
    Abstract: Algae, including cyanobacteria, are in the spotlight today for a number of reasons; firstly it has become abundantly clear over recent years that algae have been neglected in terms of basic research and that knowledge gap is being rapidly closed with the establishment of some surprising discoveries, such as the presence of Near-Infra-Red-Absorbing cyanobacteria and a wealth of natural products; secondly molecular approaches have provided a wealth of approaches to genetically modify algae and produce value-added products; thirdly it has become clear just how important, marine phytoplankton is to global carbon capture and the production of food globally; and fourthly, it has also become clear that algae present unparalleled opportunities to generate biofuels in a sustainable and non-polluting way. This volume presents 15 chapters by world experts on their subjects, ranging from reviews of algal diversity and genetics to in-depth reviews of special algal groups such as diatoms (which account for over 30% of marine carbon capture). Other chapters chart the ways in which this carbon capture occurs or how there are a multiplicity of ways in which algae intercept sun light and deploy this energy for carbon capture. A fascinating aspect here is the way in which sun light is harvested. A special chapter is devoted to the very recent and exciting possibility that algae use coherent light energy transformation to enhance the efficiency of light capture, an aspect of quantum physics that has implications for future developments at several levels and a variety of industries. Just how and why algae use Chlorophyll a as the major light capture pigment is discussed in several chapters. However, attention is also given to those cyanobacteria, which have been found to use the special Near-Infra Red absorbing chlorophylls mentioned above. And attention is also given to those algae that employ phycobiliproteins to fill in the “green window”, i.e., the spectral region from 400 – 650 nm, which is not efficiently covered by chlorophyll and carotenoid pigments. Photoinhibition and photoprotection is the subject area of several chapters and one which it is essential to understand a we work towards greater efficiency of algal photosynthesis. A final chapter is devoted to understanding the molecular basis for coral bleaching, a much-neglected area that is essential in trying to come up with solutions to this very worrying phenomenon, caused by global warming and ocean acidification. This is a book for research scientists, environmentalists, planners in a range of areas including those of marine resources, nutrient control and pollution of water bodies and that growing body of concerned citizens interested in controlling carbon emissions and global warming. Special attention has been given to generating a set of articles that will be read by university students, informed laymen and all those whose wish to understand the rapid changes that have come about in our knowledge of algae over the past decade.
    Type of Medium: Online Resource
    Pages: XXXVI, 514 p. 110 illus., 87 illus. in color. , online resource.
    Edition: 1st ed. 2020.
    ISBN: 9783030333973
    Series Statement: Advances in Photosynthesis and Respiration, Including Bioenergy and Related Processes, 45
    DDC: 572.2
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Genetics 38 (2004), S. 119-173 
    ISSN: 0066-4197
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: This review focuses on the biosynthesis of pigments in the unicellular alga Chlamydomonas reinhardtii and their physiological and regulatory functions in the context of information gathered from studies of other photosynthetic organisms. C. reinhardtii is serving as an important model organism for studies of photosynthesis and the pigments associated with the photosynthetic apparatus. Despite extensive information pertaining to the biosynthetic pathways critical for making chlorophylls and carotenoids, we are just beginning to understand the control of these pathways, the coordination between pigment and apoprotein synthesis, and the interactions between the activities of these pathways and those for other important cellular metabolites branching from these pathways. Other exciting areas relating to pigment function are also emerging: the role of intermediates of pigment biosynthesis as messengers that coordinate metabolism in the chloroplast with nuclear gene activity, and the identification of photoreceptors and their participation in critical cellular processes including phototaxis, gametogenesis, and the biogenesis of the photosynthetic machinery. These areas of research have become especially attractive for intensive development with the application of potent molecular and genomic tools currently being applied to studies of C. reinhardtii.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford BSL : Blackwell Science Ltd
    Molecular microbiology 30 (1998), S. 0 
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Light-harvesting in cyanobacteria and red algae is a function of the biliproteins, which have covalently bound bilin chromophores. The biliproteins are assembled with linker proteins into the phycobilisome, a large complex that resides on the surface of the photosynthetic membranes. Early steps in the phycobilisome assembly pathway include the folding of biliprotein α- and β-subunits, covalent modification of subunits by bilin attachment and formation of the primary assembly unit, the αβ heterodimer. The potential role of bilins in subunit structure and assembly is examined in this study by site mutagenesis of biliprotein genes. Phycocyanin subunits from Synechocystis sp. 6701 that were unable to bind chromophores at specific sites were generated by changing the codons for bilin-binding cysteines to alanine residues. The altered genes were then expressed in a phycocyanin-minus mutant of the transformable Synechocystis sp. strain 6803. Single and multiple chromophore deletions cause specific and reproducible variations in phycobilisome-associated phycocyanin that do not correlate with transcript levels. Sedimentation equilibrium studies with purified proteins showed that bilin absence reduces the strength of αβ interaction in the heterodimer. These results suggest that phycocyanin instability in bilin-deletion mutants is a consequence of diversion of unassembled α- and β-subunits to a degradation pathway. Attachment of the central bilin, which is common to all biliprotein subunits, may facilitate αβ interaction by completing the final stage of subunit folding and stabilizing the contact domains of binding partners in the heterodimer.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The recent discovery of large numbers of phytochrome photoreceptor genes in both photosynthetic and non-photosynthetic prokaryotes has led to efforts to understand their physiological roles in environmental acclimation. One receptor in this class, RcaE, is involved in controlling complementary chromatic adaptation, a process that regulates the transcription of operons encoding light-harvesting proteins in cyanobacteria. Although all previously identified phytochrome responses are maximally sensitive to red and far red light, complementary chromatic adaptation is unique in that it is responsive to green and red light. Here, we present biochemical and genetic evidence demonstrating that RcaE is a photoreceptor and that it requires the cysteine at position 198 to ligate an open chain tetrapyrrole covalently in a manner analogous to chromophore attachment in plant phytochromes. Furthermore, although the wild-type rcaE gene can rescue red and green light photoresponses of an rcaE null mutant, a gene in which the codon for cysteine 198 is converted to an alanine codon rescues the red light but not the green light response. Thus, RcaE is a photoreceptor that is required for both green and red light responsiveness during complementary chromatic adaptation and is the first identified phytochrome class sensor that is involved in sensing and responding to green and red light rather than red and far red light.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 343 (1980), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1572-9818
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Photosynthetic light harvesting in plants is regulated in response to changes in incident light intensity. Absorption of light that exceeds a plant's capacity for fixation of CO2 results in thermal dissipation of excitation energy in the pigment antenna of photosystem II by a poorly ...
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-5028
    Keywords: allophycocyanin ; phycobilisome ; phycocyanin ; phycoerythrin ; plastid ; red algae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The genes encoding the α and β subunits of allophycocyanin, phycocyanin and phycoerythrin from the red alga Aglaothamnion neglectum were isolated and characterized. While the operons containing the different phycobiliprotein genes are dispersed on the plastid genome, the genes encoding the α and β subunits for each phycobiliprotein are contiguous. The β subunit gene is 5′ for both the phycocyanin and phycoerythrin operons, while the α subunit gene is 5′ for the allophycocyanin operon. The amino acid sequences of A. neglectum phycobiliproteins, as deduced from the nucleotide sequences of the genes, are 65–85% identical to analogous proteins from other red algae and cyanobacteria. The conserved nature of the plastid-encoded red algal and cyanobacterial phycobiliprotein genes supports the proposed origin of red algal plastids from cyanobacterial endosymbionts. Many environmental factors effect phycobilisome biosynthesis. The effect of both nutrient availability and light quantity on the level of A. neglectum phycobiliprotein subunits and the mRNA species encoding those subunits is described.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 252 (1996), S. 572-579 
    ISSN: 1617-4623
    Keywords: Key words Bacillariophyta ; Biolistic transformation ; Phleomycin ; Reporter gene ; Selectable marker
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A nuclear transformation system has been developed for the diatom Phaeodactylum tricornutum using microparticle bombardment to introduce the sh ble gene from Streptoalloteichus hindustanus into cells. The sh ble gene encodes a protein that confers resistance to the antibiotics Zeocin and phleomycin. Chimeric genes containing promoter and terminator sequences from the P. tricornutum fcp genes were used to drive expression of sh ble. Between 10–100 transformants were recovered/108 cells. Transformants were able to grow on at least 500 μg/ml of Zeocin, which is 10 times the amount necessary to kill wild-type cells. Based on Southern hybridizations the sh ble gene was present in 1–3 copies/transformant. Relative levels of correctly processed transcripts were correlated with the abundance of the Sh ble protein (present at 0.1–2.0 μg/mg total protein). The cat reporter gene fused to a fcp promoter could also be introduced by microparticle bombardment and was found to be highly expressed (average of 7.1 U/mg total protein). This work demonstrates that heterologous genes can be readily expressed in P. tricornutum. The development of selectable marker and reporter gene constructs provides the tools necessary for dissecting gene structure and regulation, and introducing novel functions into diatoms.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 218 (1989), S. 229-239 
    ISSN: 1617-4623
    Keywords: Clamydomonas ; Arylsulfatase ; λ gt11 ; Codon usage ; Sulfate regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Chlamydomonas reinhardtii produces a periplasmic arylsulfatase in response to sulfur deprivation. We have isolated and sequenced arylsulfatase cDNAs from a λ gt11 expression library. The amino acid sequence of the protein, as deduced from the nucleotide sequence, has features characteristic of secreted proteins, including a signal sequence and putative glycosylation sites. The gene has a broad codon usage with seven codons, all having A residues in the third position, not previously observed in C. reinhardtii genes. Arylsulfatase transcription is tightly regulated by sulfur availability. The ∼2.7 kb arylsulfatase transcript is very susceptible to degradation, disappearing in less than an hour after sulfur starved cells are administered either sulfate or α-amanitin. The accumulation of the arylsulfatase transcript is also suppressed by the addition of cycloheximide. Transcription initiation from the arylsulfatase gene occurs ∼ 100 bp upstream of the initiation codon, in a region that is 5′ to a 43 bp imperfect inverted repeat. Preceding the transcription start site are sequences similar to those present in promoter regions of other genes from C. reinhardtii.
    Type of Medium: Electronic Resource
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