Polyamine
Mostrando 13-24 de 423 artigos, teses e dissertações.
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13. Influência do etileno e de poliaminas sobre a morfogênese in vitro do maracujá (Passiflora sp.) / Morphogenesis in vitro of passion fruit (Passiflora sp.) as affected by ethylene and polyamines
The present study was conducted to evaluate possible interactions between ethylene and polyamines levels upon in vitro morphogenesis of two passion fruit species (Passiflora cincinnata Masters and P. edulis Sims f. flavicarpa Degener, population FB-100). Hypocotyl-derived segments (average 10 mm length) were cultivated in MS-based medium, with B5 vitamin com
Publicado em: 2006
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14. SYSTEMIC ADMINISTRATION OF SPERMIDINE AND ARCAINE ALTERS MEMORY OF THE INIBITORY AVOIDANCE TASK IN RATS: STATE DEPENDENCE INVOLVIMENT. / ADMINISTRAÇÃO SISTÊMICA DE ESPERMIDINA E ARCAÍNA ALTERA A MEMÓRIA DA TAREFA DE ESQUIVA INIBITÓRIA EM RATOS: ENVOLVIMENTO DA DEPENDÊNCIA DE ESTADO
The polyamines, putrescine, spermidine and spermine, are present in high concentrations in the central nervous system and, because of their policationic nature, they can interact with diverse cellular anionic targets (nucleic acids and proteins) and modulate the learning and memory by interacting with the polyamine binding site at N-methyl-D-aspartate recept
Publicado em: 2006
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15. Metabolism of nitrogen compounds and carbohydrates, and modification of cell wall of citrus infected by Xylella fastidiosa / Metabolismo de compostos nitrogenados e carboidratos, e alterações nas paredes celulares de plantas de citros infectadas por Xylella fastidiosa
Xylellafastidiosa (Xj) is a fastidious bacterium which grows exclusively in the xylem of several plants. In citrus the disease caused by Xf is known as "clorose variegada do citros" (CVC), being responsible for marked loss of productivity since the 80s. Although a meaningful number of reports have been published in the literature about Xf, little is know abo
Publicado em: 2006
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16. Intracellular polyamine pools, oligopeptide-binding protein A expression, and resistance to aminoglycosides in Escherichia coli
The role of intracellular free polyamine (putrescine and spermidine) pools in multiple resistance to aminoglycoside antibiotics was investigated among in vitro selected kanamycin-resistant Escherichia coli J53 mutants expressing diminished oligopeptide-binding protein (OppA) levels and/or defective ornithine decarboxylase (ODC) activity. The results suggest
Memórias do Instituto Oswaldo Cruz. Publicado em: 2005-11
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17. POLIAMINAS MODULAM A MEMÓRIA NAS TAREFAS DE MEDO CONDICIONADO E ESQUIVA INIBITÓRIA EM RATOS / POLYAMINES MODULATE MEMORY IN FEAR-CONDIDIONING AND INHIBITORY AVOIDANCE TASKS IN RATS.
The polyamines, spermine, spermidine and putrescine, are a group of aliphatic amines that interact with diverse cellular targets such as nucleic acids and proteins. The polyamines may act as physiological modulators of N-methyl-D-aspartate (NMDA) receptors. The processes mediated by NMDA receptor include synaptic plasticity and formation of neural circuitry.
Publicado em: 2004
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18. Transport and morphology of water based and solvent borne epoxy polyamine coating schemes. / Transporte e morfologia de esquemas de tintas epóxi poliamina equivalentes à base de solvente e água.
In the present work, anticorrosive properties of solvent borne and water based epoxy polyamine coatings were studied comparatively. First these studies were performed for the individual layers of these coatings, i.e., primer, under coating and topcoat, and, finally, for the set of the layers, which was named complete scheme (for both kinds of epoxy polyamine
Publicado em: 2003
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19. Níveis de Putrescina, Poliaminas e Nutrientes Minerais Relacionados a Diferentes Concentrações de Potássio em Bananeira (Musa sp., AAA e AAB) cvs. Nanica e Prata Anã in Vitro / Levels of putrescine, polyamines and mineral nutrients in relation to different potassium concentrations in banana plant (Musa sp., AAA and AAB) cvs. Nanica and Prata anã in vitro condition
Nas abordagens biotecnológicas de propagação de plantas, os meios de cultura devem ter uma composição química adequada à essa finalidade permitindo a otimização da produção. Como a bananeira (Musa sp.) é exigente em potássio, a busca do nível adequado desse macronutriente envolve não somente o comprometimento com o nível dos outros nutrientes
Publicado em: 1998
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20. Determinação das poliaminas da clara do ovo e sua participação na reação de Maillard
A rápida diminuição do valor nutritivo da ovalbumina, durante o armazenamento com a glicose, aparentemente, não pode ser explicado pela simples perda de lisina ou pelas perdas da solubilidade e digestibilidade da proteína através da reação de Maillard.Se além dos grupos α e ε: amino dos aminoácidos da proteína., estivessem presentes na c
Publicado em: 1979
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21. Control of Filament Formation in Candida albicans by Polyamine Levels
Candida albicans, the most common fungal pathogen, regulates its cellular morphology in response to environmental conditions. The ODC gene, which encodes ornithine decarboxylase, a key enzyme in polyamine biosynthesis, was isolated and disrupted. Homozygous null Candida mutants behaved as polyamine auxotrophs and grew exclusively in the yeast form at low pol
American Society for Microbiology.
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22. Polyamine biosynthesis impacts cellular folate requirements necessary to maintain S-adenosylmethionine and nucleotide pools
Folate (vitamin B9) is utilized for synthesis of both S-adenosylmethionine (AdoMet) and deoxythymidine monophosphate (dTMP), which are required for methylation reactions and DNA synthesis, respectively. Folate depletion leads to an imbalance in both AdoMet and nucleotide pools, causing epigenetic and genetic damage capable of initiating tumorigenesis. Polyam
The Federation of American Societies for Experimental Biology.
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23. Effect of a Bis-Benzyl Polyamine Analogue on Pneumocystis carinii
Pneumocystis carinii is the causative agent of P. carinii pneumonia (PCP), an opportunistic infection associated with AIDS and other immunosuppressed conditions. Although polyamine metabolism of this fungus has been shown to be a chemotherapeutic target, this metabolism has not been thoroughly investigated. Reported here is the effect of one polyamine analog
American Society for Microbiology.
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24. Polyamine Regulation of Ornithine Decarboxylase Synthesis in Neurospora crassa
Ornithine decarboxylase (ODC) of the fungus Neurospora crassa, encoded by the spe-1 gene, catalyzes an initial and rate-limiting step in polyamine biosynthesis and is highly regulated by polyamines. In N. crassa, polyamines repress the synthesis and increase the degradation of ODC protein. Changes in the rate of ODC synthesis correlate with similar changes i
American Society for Microbiology.