Polyamine
Mostrando 1-12 de 423 artigos, teses e dissertações.
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1. Changes in the proteomic and polyamine profile induced by seed aging of Cariniana legalis (Martius) O. Kuntze
Resumo Estudos sobre processos metabólicos e germinabilidade de sementes de espécies nativas ameaçadas de extinção são essenciais para sua conservação. O objetivo deste trabalho foi avaliar o efeito do envelhecimento acelerado na germinação e no perfil proteômico e de poliamina (PAs) em sementes de Cariniana legalis. As sementes foram envelhecidas
Ciência Florestal. Publicado em: 2022
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2. Revestimentos de alta camada obtidos com a modificação de resinas epóxi novolaca pela reação com organo-siloxano e catálise ácida
Epoxy resins are an important class of thermostable polymers, widely used in structural applications or as adhesives. However, the low fracture resistance is their main weakness in many applications. Due to this fact, this study aims to modify a polymer matrix based on a novolac epoxy resin with an organo siloxane (AMS). The final properties of cured epoxys
Quím. Nova. Publicado em: 2017-02
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3. Ozonated water and chlorine effects on the antioxidant properties of organic and conventional broccoli during postharvest
There is growing interest in studies on sanitizers other than chlorine that can maintain the quality of organic products without affecting their phytochemical content. The effects of using chlorinated and ozonized water treatments, as sanitizing procedures, on the post-harvest quality of organic and conventional broccoli (Brassica oleracea L.) cv. Italica wa
Sci. agric. (Piracicaba, Braz.). Publicado em: 2014-04
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4. Interaction of polyamine on oxidative stress induced by exogenously applied hydrogen peroxide in Salvinia natans Linn
A hydroponics experiment was carried out to study the role of hydrogen peroxide (H2O2) through changes of oxidative stress and antioxidation activity in Salvinia natans Linn. H2O2 is an active oxygen species, widely generated in many biological systems, and mediates various physiological and biochemical processes in plants. In this study, we demonstrated tha
Theor. Exp. Plant Physiol.. Publicado em: 08/11/2013
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5. Mecanismos moleculares da ação tóxica pró-oxidante de 1,4-diamino-2-butanona, um análogo de putrescina, sobre células de mamíferos e Trypanosoma cruzi / The Molecular mechanisms of pro-oxidant activity of 1,4-diamino-2-butanone, a putrescine analogue, to mammalian cells and Trypanosoma cruzi
α-Aminocarbonyl componds such as 5-aminolevunilic acid (ALA) and aminoacetone (AA) have been shown to exhibit pro-oxidant properties. These compounds undergo phosphate-catalyzed enolization in physiological pH and subsequent aerobic oxidation, yielding reactive oxygen species, NH4+ ions and an α-oxoaldehyde highly cytotoxic. The α-aminoketone 1
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/06/2012
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6. Retinal protective effects of topically administered agmatine on ischemic ocular injury caused by transient occlusion of the ophthalmic artery
Agmatine, an endogenous polyamine and putative neuromodulator, is known to have neuroprotective effects on various neurons in the central nervous system. We determined whether or not topically administered agmatine could reduce ischemic retinal injury. Transient ocular ischemia was achieved by intraluminal occlusion of the middle cerebral artery of ddY mice
Brazilian Journal of Medical and Biological Research. Publicado em: 2012-03
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7. Arcaine-induced state-dependent memory involves opioid mechanisms in rats / ENVOLVIMENTO DO SISTEMA OPIÓIDE NA DEPENDÊNCIA DE ESTADO INDUZIDA PELA ARCAÍNA EM RATOS
Arcaine is a competitive antagonist of the polyamine binding site at the NMDA receptor which induces state-dependent recall. However, no study has addressed the involvement of other neurotransmitter/neuromodulators in arcaine-induced state dependency. The current study investigates whether the opioid system is involved in arcaine-induced state-dependent memo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2011
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8. Polyamine patterns in haploid and diploid tobacco tissues and in vitro cultures
O objetivo deste trabalho foi determinar os níveis de PAs em tecidos de medula e cultura de calos de plantas haplóides e diplóides de tabaco, obtidas da região apical e basal do caule. Estes explantes foram cultivados em meio RM-64 suplementado com AIA e cinetina, na luz e no escuro, durante vários subcultivos. Nos tecidos medulares, os níveis de PAs a
Brazilian Archives of Biology and Technology. Publicado em: 2010-04
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9. Atividade anti-trichomonas vaginalis de alcaloides de amaryllidaceae e análogos de poliaminas : análise química, semi-síntese e investigação do mecanismo de ação
A família Amaryllidaceae é reconhecida como fonte de compostos bioativos, sendo o isolamento e elucidação estrutural de seus alcaloides, aliado às avaliações farmacológicas, um tema importante. Estudos mostram que o mecanismo de ação da citotoxicidade desses alcaloides é seletivo e depende da linhagem celular. Trichomonas vaginalis é um protozoá
Publicado em: 2010
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10. Fish oil ingestion reduces the number of aberrant crypt foci and adenoma in 1,2-dimethylhydrazine-induced colon cancer in rats
We determined the effect of fish oil (FO) ingestion on colonic carcinogenesis in rats. Male Wistar rats received 4 subcutaneous injections (40 mg/kg body weight each) of 1,2-dimethylhydrazine (DMH) at 3-day intervals and were fed a diet containing 18% by weight FO (N = 10) or soybean oil (SO, N = 10) for 36 weeks. At sacrifice, the colon was removed, aberran
Brazilian Journal of Medical and Biological Research. Publicado em: 2009-12
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11. POLIAMINERGIC AGENTS MODULATE CONTEXTUAL FEAR EXTINCTION IN RATS / AGENTES POLIAMINÉRGICOS MODULAM A EXTINÇÃO DO MEDO CONDICIONADO CONTEXTUAL EM RATOS
Polyamines, such as spermidine and spermine, have been reported to improve memory retention through the activation of N-methyl-D-aspartate receptors (NMDAr). However whether polyamine agonists and antagonists alter extinction remains unclear. In the current study, we investigated whether spermidine and polyamine antagonists that selectively block the NR2B su
Publicado em: 2009
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12. SYSTEMIC ADMINISTRATION OF POLYAMINERGIC AGENTS MODULATE FEAR CONDITIONING IN RATS. / ADMINISTRAÇÃO SISTÊMICA DE AGENTES POLIAMINÉRGICOS MODULA A MEMÓRIA NA TAREFA DE MEDO CONDICIONADO EM RATOS
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: 2006