Usnic Acid
Mostrando 13-20 de 20 artigos, teses e dissertações.
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13. Atividade antimicobacteriana, citotoxicidade e interaÃÃo com macrÃfagos J774 de lipossomas contendo Ãcido Ãsnico
Secondary lichen metabolite usnic acid (UA) [2,6-diacetyl-7,9-dihydroxy-8,9b-dimethyl-1,3(2H,9bH)-dibenzofurano] is known by its antimicrobial activity against gram-positive bacteria and mycobacteria. Pulmonary tuberculosis is characterized by involvement of macrophages containing inside a large number of Mycobacterium tuberculosis. Liposomes have long been
Publicado em: 2006
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14. Radiossensibilidade gama de Cladonia substellata Vainio (lÃquen) e o conseqÃente efeito sobre rochas calcÃrias / Gamma radiosensibility of Cladonia substellata vainio (lichen) and the consequent chelating effect on calcareous rocks
Soil is an unconsolidated surface that recovers the rocks and maintains animal and plant life on Earth. It is formed from climatic and biotic relationship, modified by topography that acts on original material, over a long period of time. Concerning biotic activities, one may emphasize that performed by lichens, which allow the succession of rocky substratum
Publicado em: 2006
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15. Lipossomas convencionais e sÃtioespecÃficos (lectina-conjugada) contendo antineoplÃsicos
Lipossomas sÃo vesÃculas aquosas formadas por bicamadas de fosfolipÃdios e constituem excelentesformas farmacÃuticas de liberaÃÃo controlada de fÃrmacos devido à sua flexibilidade estrutural em termos de tamanho, composiÃÃo, fluidez da bicamada lipÃdica e capacidade para incorporar tanto compostos hidrofÃlicos quanto lipofÃlicos. As lectinas, pr
Publicado em: 2005
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16. FÃsico-quÃmica interfacial de filmes mistos de fosfolipÃdeos e Ãcido Ãsnico
The usnic acid it comes as a yellow pigment, of strong character hidrophobic, being insoluble in water and glicerol, partially soluble in etanol and easily soluble in ether, acetone, benzene and chloroform. Produced by liquens seeking your defense, the acid Ãsnico is in the shaft liquÃnico, where your concentration seems to be related with the integral amo
Publicado em: 2004
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17. ProduÃÃo do Ãcido Ãsnico de Cladonia substellata vainio (lÃquen) por imobilizaÃÃo celular, utilizando diferentes mÃtodos
Este estudo teve como objetivo produzir os metabÃlitos de Cladonia substellata Vainio. atravÃs do uso de biorreatores com sistema em repouso (tradicional), com movimento e sob fluxo contÃnuo (inÃditas). Os biorreatores foram montados utilizando caulinita como matriz de enclausuramento e acetato de sÃdio a 0,1; 1,0 e 10mM. No sistema em repouso observou-
Publicado em: 2004
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18. Usnic Acid, a Natural Antimicrobial Agent Able To Inhibit Bacterial Biofilm Formation on Polymer Surfaces
In modern medicine, artificial devices are used for repair or replacement of damaged parts of the body, delivery of drugs, and monitoring the status of critically ill patients. However, artificial surfaces are often susceptible to colonization by bacteria and fungi. Once microorganisms have adhered to the surface, they can form biofilms, resulting in highly
American Society for Microbiology.
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19. In vitro activities of the lichen secondary metabolites vulpinic acid, (+)-usnic acid, and (-)-usnic acid against aerobic and anaerobic microorganisms.
Secondary metabolites of different species of lichen were tested for their activities against a variety of microbial species. While gram-negative rods and fungi were not inhibited by these compounds, Staphylococcus aureus, Enterococcus faecalis, Enterococcus faecium, and some anaerobic species (Bacteroides and Clostridium species) were susceptible at the con
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20. Equivalence between Pfr and Cyclic AMP in the Induction of d-Usnic Acid Dehydrogenase in the Lichen Evernia prunastri1
d-Usnic acid dehydrogenase is induced in Evernia prunastri thalli by a supply of exogenous d-usnic acid in light. This effect is enhanced by red light pulses through a two step way: a very rapid increase of activity after the first 10 minutes of red light, which is not reversed by far-red light, and a slow enhancement following successive red light pulses at