The Regulation Of Nitrogen Fixation Over Diel Cycles By The Cyanobacterium Nostoc Muscorum In Mill Creek California PDF Download
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Author | : Rhea Lorraine Williamson |
Publisher | : |
Total Pages | : 404 |
Release | : 1987 |
Genre | : |
ISBN | : |
Download The Regulation of Nitrogen Fixation Over Diel Cycles by the Cyanobacterium Nostoc Muscorum in Mill Creek, California Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 640 |
Release | : 1988 |
Genre | : Dissertations, Academic |
ISBN | : |
Download Dissertation Abstracts International Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 948 |
Release | : 1964 |
Genre | : Limnology |
ISBN | : |
Download Advances in Limnology Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 1252 |
Release | : 1989 |
Genre | : Dissertations, Academic |
ISBN | : |
Download Index to American Doctoral Dissertations Book in PDF, ePub and Kindle
Author | : Shani Kleinhaus |
Publisher | : |
Total Pages | : 280 |
Release | : 1994 |
Genre | : |
ISBN | : |
Download Ecophysiology of Mutualism in a Unique Stream Symbiosis Between a Polymorphic Cyanobacterium, Nostoc Parmelioides, and the Larvae of the Midge Cricotopus Nostocicola Book in PDF, ePub and Kindle
Author | : Te-Jin Chow |
Publisher | : |
Total Pages | : 238 |
Release | : 1996 |
Genre | : |
ISBN | : |
Download Studies on the Regulation of Nitrogen Fixation in Cyanobacteria, with Specal Reference to the Effects of Oxygen Book in PDF, ePub and Kindle
Author | : Danielle Alyce Griffith |
Publisher | : |
Total Pages | : 176 |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Nitrogen Fixation by the Cyanobacterium Nostoc Punctiforme in Response to Variation in Nitrogen Availability, Temperature and Atmospheric CO2 Concentrations Book in PDF, ePub and Kindle
The predominant input of available nitrogen (N) in boreal forest ecosystems originates from moss-associated cyanobacteria, which fix unavailable atmospheric N2, contribute to the soil N pool, and thereby support forest productivity. Although increases in N availability, temperature, and atmospheric CO2 concentrations are expected in Canada's boreal region over the next century, little is known about the combined effects of these factors on N2 fixation by axenic cyanobacteria or the associated mechanisms. I assessed changes in N2 fixation by Nostoc punctiforme under different global environmental change scenarios and examined correlations between the response and changes in growth, heterocyst percentage, and heterocyst activity. With available N present, N. punctiforme did not perform N2 fixation or form heterocysts. Elevated CO2 stimulated growth and N2 fixation, but this result was influenced by a temperature-mediated growth cycle. Overall, my findings suggest a decrease in boreal N2 fixation rates in response to global environmental change.
Author | : Michael Lloyd Summers |
Publisher | : |
Total Pages | : 314 |
Release | : 1995 |
Genre | : |
ISBN | : |
Download The Role and Regulation of Glucose-6-phosphate Dehydrogenase in Diazotrophic and Dark Heterotrophic Growth of the Cyanobacterium Nostoc Sp. Strain ATCC 29133 Book in PDF, ePub and Kindle
Author | : Krithika Kumar |
Publisher | : |
Total Pages | : |
Release | : 2012 |
Genre | : |
ISBN | : |
Download Regulation of the Nitrogen Fixation Genes in the Heterocystous Cyanobacterium Anabaena Sp. Strain PCC 7120 Book in PDF, ePub and Kindle
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 | : Loïc Charpy |
Publisher | : Musee Oceanographique |
Total Pages | : 644 |
Release | : 1999 |
Genre | : Science |
ISBN | : |
Download Marine Cyanobacteria Book in PDF, ePub and Kindle