Synechococcus Sp
Mostrando 13-24 de 228 artigos, teses e dissertações.
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13. Efeito das cianobactérias Synechococcus leopoliensis e nostoc sp. sobre Colletotrichum sublineolum e na interação do patógeno com plantas de sorgo
Entre os patógenos que provocam perdas na cultura de sorgo (Sorghum bicolor), Colletotrichum sublineolum, agente causal da antracnose, é tido como um dos principais problemas. Com o objetivo de buscar medidas alternativas para o controle da doença, testou-se o efeito de duas cianobactérias, Synechococcus leopoliensis e Nostoc sp., sobre o fitopatógeno e
Fitopatologia Brasileira. Publicado em: 2002-04
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14. Uptake of 2-Oxoglutarate in Synechococcus Strains Transformed with the Escherichia coli kgtP Gene
A number of cyanobacteria from different taxonomic groups exhibited very low levels of uptake of 2-[U-14C]oxoglutarate. Synechococcus sp. strain PCC 7942 was transformed with DNA constructs carrying the Escherichia coli kgtP gene encoding a 2-oxoglutarate permease and a kanamycin resistance gene cassette. The Synechococcus sp. strains bearing the kgtP gene i
American Society for Microbiology.
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15. Monomeric NarB Is a Dual-Affinity Nitrate Reductase, and Its Activity Is Regulated Differently from That of Nitrate Uptake in the Unicellular Diazotrophic Cyanobacterium Synechococcus sp. Strain RF-1
Synechococcus sp. strain RF-1 is a unicellular freshwater cyanobacterium that fixes N2 aerobically and exhibits a circadian rhythm for nitrogenase activity under a light-dark regimen. Synechococcus sp. strain RF-1 also utilizes nitrate, nitrite, or ammonium for growth. Under the diazotrophic growth, the nitrate uptake in Synechococcus sp. strain RF-1 was ind
American Society for Microbiology.
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16. Expression of glnA in the cyanobacterium Synechococcus sp. strain PCC 7942 is initiated from a single nif-like promoter under various nitrogen conditions.
The glnA mRNA, encoding glutamine synthetase, is differentially accumulated in the cyanobacterium Synechococcus sp. strain PCC 7942 in media containing different nitrogen sources. With the different nitrogen compounds, transcription of glnA initiated at a single site located -146 nucleotides upstream of the translation start site of the gene. A similarity of
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17. The pacL gene of Synechococcus sp. strain PCC 7942 encodes a Ca(2+)-transporting ATPase.
An ATP-dependent Ca2+ uptake activity was identified in plasma membrane vesicles prepared from Synechococcus sp. strain PCC 7942. This activity was insensitive to agents which collapse pH gradients and membrane potentials but sensitive to vanadate, indicating that the activity is catalyzed by a P-type Ca(2+)-ATPase. A gene was cloned from Synechococcus sp. s
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18. Insertional inactivation of genes to isolate mutants of Synechococcus sp. strain PCC 7942: isolation of filamentous strains.
We have developed a simple procedure for generating mutants of the cyanobacterium Synechococcus sp. strain PCC 7942 in which the site of the lesion can be readily identified. This procedure involves transforming Synechococcus sp. strain PCC 7942 with a library of its own DNA that was fully digested with Sau3A and ligated into the plasmid vector pUC8. The hom
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19. Cyanophycin Production in a Phycoerythrin-Containing Marine Synechococcus Strain of Unusual Phylogenetic Affinity†
Thirty-two strains of phycoerythrin-containing marine picocyanobacteria were screened for the capacity to produce cyanophycin, a nitrogen storage compound synthesized by some, but not all, cyanobacteria. We found that one of these strains, Synechococcus sp. strain G2.1 from the Arabian Sea, was able to synthesize cyanophycin. The cyanophycin extracted from t
American Society for Microbiology.
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20. Clade-Specific 16S Ribosomal DNA Oligonucleotides Reveal the Predominance of a Single Marine Synechococcus Clade throughout a Stratified Water Column in the Red Sea
Phylogenetic relationships among members of the marine Synechococcus genus were determined following sequencing of the 16S ribosomal DNA (rDNA) from 31 novel cultured isolates from the Red Sea and several other oceanic environments. This revealed a large genetic diversity within the marine Synechococcus cluster consistent with earlier work but also identifie
American Society for Microbiology.
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21. General distribution of the nitrogen control gene ntcA in cyanobacteria.
The ntcA gene from Synechococcus sp. strain PCC 7942 encodes a regulatory protein which is required for the expression of all of the genes known to be subject to repression by ammonium in that cyanobacterium. Homologs to ntcA have now been cloned by hybridization from the cyanobacteria Synechocystis sp. strain PCC 6803 and Anabaena sp. strain PCC 7120. Seque
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22. Identification and cloning of a regulatory gene for nitrogen assimilation in the cyanobacterium Synechococcus sp. strain PCC 7942.
Twenty-seven mutants that were unable to assimilate nitrate were isolated from Synechococcus sp. strain PCC 7942. In addition to mutants that lacked nitrate reductase or nitrite reductase, seven pleiotropic mutants impaired in both reductases, glutamine synthetase, and methylammonium transport were also isolated. One of the pleiotropic mutants was complement
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23. Characterization of a zwf mutant of Synechococcus sp. strain PCC 7942.
A mutant of the cyanobacterium Synechococcus sp. strain PCC 7942 carrying a disrupted gene encoding glucose-6-phosphate dehydrogenase (zwf) produced no detectable glucose-6-phosphate dehydrogenase as assessed by enzyme assay and Western blot (immunoblot) analysis. This mutant exhibited significantly impaired dark viability.
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24. An abundant cell-surface polypeptide is required for swimming by the nonflagellated marine cyanobacterium Synechococcus.
Certain marine unicellular cyanobacteria of the genus Synechococcus exhibit a unique and mysterious form of motility characterized by the ability to swim in liquid in the absence of flagella. An abundant cell-surface-associated polypeptide that is required for swimming motility by Synechococcus sp. strain WH8102 has been identified, and the gene encoding it,