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Author: Lars Hällbom
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Author: Lars Hällbom
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Book Description
Author: Lars Hällbom
Publisher:
ISBN: 9789155412852
Category : Kväveassimilation: växtfysiologi
Languages : en
Pages : 17
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Author: Krithika Kumar
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Many multicellular cyanobacteria produce specialized nitrogenfixing heterocysts. During diazotrophic growth of Anabaena (Nostoc) sp. strain PCC 7120, a regulated developmental pattern of single heterocysts separated by about 10 to 20 photosynthetic vegetative cells is maintained along filaments. Heterocyst structure and metabolic activity function together to accommodate oxygensensitive nitrogen fixation, catalyzed by nitrogenase. In this work, we show that the promoter of the nifHDK genes that encode nitrogenase, lies upstream from the intergenic region between nifH and nifU. Excision of the fdxN element is required for transcription of the nifHDK genes. Fluorescence microscopy of reporter strain PnifHD-gfp, in the chromosomal nif locus indicated that expression of nifHDK is blocked in mutants that are unable to excise the fdxN element after nitrogen deprivation. We proposed that a promoter upstream of the element, likely PnifB, is required for transcription of the nifHDK genes. Indeed, the PnifHD-gfp reporter at an ectopic site did not show GFP fluorescence. A PnifB-gfp reporter was expressed specifically in heterocysts indicating that a promoter for the nifB gene lies in the intergenic region upstream of nifB. A stem loop structure located in the intergenic region between nifH and nifU may act as a processing site for production of nifHDK transcripts. We also provide evidence that DevH, a transcriptional regulator, is involved in regulating the nifBfdxNnifSUHDK genes. DevH is a protein belonging to the cAMP receptor protein (CRP) family of proteins that are widespread in bacteria and regulate genes in response to a gamut of physiological conditions. We show that DevH binds specifically to the nifB upstream region but not to the immediate upstream region of nifH. We predict that DevH binds to an NtcAlike binding site upstream of nifB and functions as an activator of the nifB-fdxN-nifSUHDK genes. Finally, we show that sigE, which is expressed at 16 hours after nitrogen deprivation, is required for normal expression of some heterocyst specific genes, including nifHDK. A sigE mutant shows delayed and reduced expression of nifHDK and some middle and late genes. We hypothesize that DevH in concert with SigE upregulates the expression of nifHDK in heterocysts after nitrogen deprivation.
Author: Lars Hällbom
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
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Author: Hajime Wada
Publisher: Springer Science & Business Media
ISBN: 9048128633
Category : Science
Languages : en
Pages : 506
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Book Description
Lipids in Photosynthesis: Essential and Regulatory Functions, provides an essential summary of an exciting decade of research on relationships between lipids and photosynthesis. The book brings together extensively cross-referenced and peer-reviewed chapters by prominent researchers. The topics covered include the structure, molecular organization and biosynthesis of fatty acids, glycerolipids and nonglycerolipids in plants, algae, lichens, mosses, and cyanobacteria, as well as in chloroplasts and mitochondria. Several chapters deal with the manipulation of the extent of unsaturation of fatty acids and the effects of such manipulation on photosynthesis and responses to various forms of stress. The final chapters focus on lipid trafficking, signaling and advanced analytical techniques. Ten years ago, Siegenthaler and Murata edited "Lipids in Photosynthesis: Structure, Function and Genetics," which became a classic in the field. "Lipids in Photosynthesis: Essential and Regulatory Functions," belongs, with its predecessor, in every plant and microbiological researcher's bookcase.
Author: B.A. Whitton
Publisher: Springer Science & Business Media
ISBN: 9780792347552
Category : Science
Languages : en
Pages : 740
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Book Description
... Begins with an overview of ... blue-green algae ... then looks at their diversity in the geological record and ... their ecology in present environments
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 1246
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Author: Loïc Charpy
Publisher: Musee Oceanographique
ISBN:
Category : Science
Languages : en
Pages : 644
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Author: Jonathan P. Zehr
Publisher: Springer Nature
ISBN: 303067746X
Category : Science
Languages : en
Pages : 191
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Book Description
This book aims to serve as a centralized reference document for students and researchers interested in aspects of marine nitrogen fixation. Although nitrogen is a critical element in both terrestrial and aquatic productivity, and nitrogen fixation is a key process that balances losses due to denitrification in both environments, most resources on the subject focuses on the biochemistry and microbiology of such processes and the organisms involved in the terrestrial environment on symbiosis in terrestrial systems, or on largely ecological aspects in the marine environment. This book is intended to provide an overview of N2 fixation research for marine researchers, while providing a reference on marine research for researchers in other fields, including terrestrial N2 fixation. This book bridges this knowledge gap for both specialists and non-experts, and provides an in-depth overview of the important aspects of nitrogen fixation as it relates to the marine environment. This resource will be useful for researchers in the specialized field, but also useful for scientists in other disciplines who are interested in the topic. It would provide a possible text for upper division classes or graduate seminars.
Author:
Publisher:
ISBN:
Category : Algology
Languages : en
Pages : 888
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Book Description
