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Search Results: 1 - 10 of 151607 matches for " Adolfo H.;Guilhon "
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Isolation, X-ray crystal structure and theoretical calculations of the new compound 8-Eepicordatin and identification of others terpenes and steroids from the bark and leaves of Croton palanostigma Klotzsch
Brasil, Davi S. B.;Müller, Adolfo H.;Guilhon, Gisele M. S. P.;Alves, Cláudio N.;Peris, Gabriel;Llusar, Rosa;Moliner, Vicent;
Journal of the Brazilian Chemical Society , 2010, DOI: 10.1590/S0103-50532010000400021
Abstract: phytochemical studies of the bark and leaves of croton palanostigma klotzsch (euphorbiaceae) led to the isolation of a new clerodane diterpene, 8-epicordatin (2), in addition to 12-oxohardwickiic acid methyl ester (3), aparisthman, cordatin (1), ent-trachyloban-18-oic acid, ent-13-epimanoyl oxide, ent-3-oxo-13-epimanoyl oxide, ent-3β-hydroxy-13-epimanoyl oxide, sitosterol, stigmasterol, stigmastan-3-one, 6β-hydroxystigmast-4-en-3-one, 6β-hydroxystigmasta-4,22-dien-3-one, stigmast-4-en-3-one, stigmasta-4,22-dien-3-one, 3-o-acetylaleuritolic acid, 11α-hydroxyurs-12-en-3-one, α-amyrenone, 24-methylenecycloartenone and lupenone. these compounds were isolated using typical phytochemical procedures and the structures were deduced from spectroscopic studies, including 2d nmr experiments. in addition, the crystalline structure of 8-epicordatin (2) was determined by x-ray diffraction. nmr theoretical calculations at the b3pw91/dgdzvp level were used to confirm the assignment of the chemical shifts of the h-7α and h-7β hydrogens of 8-epicordatin.
Evaluation of antinociceptive and antiinflammatory effects of Croton pullei var. glabrior Lanj. (Euphorbiaceae)
Rocha, Fábio F.;Neves, Evandro M. N.;Costa, Elson A.;Matos, Lécia G.;Müller, Adolfo H.;Guilhon, Giselle M. S. P.;Cortes, Wellington S.;Vanderlinde, Frederico A.;
Revista Brasileira de Farmacognosia , 2008, DOI: 10.1590/S0102-695X2008000300006
Abstract: croton pullei var. glabrior lanj. (euphorbiaceae) is a liana, vastly distributed in the amazonian forest. in the folk medicine, several plants of the croton genus have been used with therapeutic purposes in pathologies that involve painful and inflammatory diseases which justify this work. the aim of this study was to investigate the antinociceptive and antiinflammatory activities of the c. pullei leaves methanol extract (mecp). mecp reduced in a dose-dependent manner the number of acetic acid-induced abdominal writhing (1.2%) in mice, suggesting an antinociceptive activity of the plant. on the other hand, mecp did not significantly modify the reactivity to the thermal stimulation in the hot-plate test and the reactivity to the chemical stimulation in the formalin test first phase, indicating a non-opioid mechanism. mecp reduced the formalin-induced nociception in the second phase, inhibited the croton oil-induced ear edema and reduced the leukocytes migration in the test of the carrageenan-induced peritonitis, indicating an antiinflammatory activity. although the mechanisms that underlie these plant effects are not completely elucidated, these results appear to support the potential medicinal use of croton pullei var. glabrior lanj. against painful and inflammatory diseases.
Antraquinonas e naftoquinonas do caule de um espécime de reflorestamento de Tectona grandi (Verbenaceae)
Moreira, Rafael Y.O.;Arruda, Mara S.P.;Arruda, Alberto C.;Santos, Lourivaldo S.;Müller, Adolfo H.;Guilhon, Giselle M.S.P.;Santos, Alberdan S.;Terezo, Evaristo;
Revista Brasileira de Farmacognosia , 2006, DOI: 10.1590/S0102-695X2006000300017
Abstract: the hexane extract of the bark of tectona grandis (verbenaceae) afforded two anthraquinones and two naphtoquinones. their caracterizations were obtained through nmr spectroscopic techniques. this is the first phytochemical study of the bark of tectona grandis reforestation specimen in brazil. the main interest in this work is proving the presence of tectoquinone in reforestation specimen.
Biflavones and triterpenoids isolated from Ouratea castaneifolia (DC.) Engl., Ochnaceae
Nascimento, Luís Adriano S. do;Guilhon, Giselle M. S. P.;Arruda, Mara S. P.;Santos, Lourivaldo S.;Arruda, Alberto C.;Müller, Adolfo H.;Silva, Milton N. da;Rodrigues, Silvane T.;Carvalho, Mário G. de;
Revista Brasileira de Farmacognosia , 2009, DOI: 10.1590/S0102-695X2009000600004
Abstract: this paper presents the chemical investigation of the leaves and stems of ouratea castaneifolia (dc.) engl.. there are no chemical or pharmacological studies with this species. classic phytochemical investigation of the organic extracts together with high pressure liquid chromatography (hplc) procedures lead to the identification of seventeen metabolites: seven triterpenes (friedelin, 3β-friedelinol, α-amyrin, β-amyrin, lupeol, germanicol and taraxerol), four steroids (sitosterol, stigmasterol and the glycosides sitosteryl 3-o-β-d-glucopyranoside and stigmasteryl 3-o-β-d-glucopyranoside), one isoflavone (5,7,4'-trimethoxyisoflavone), one flavone (5,4'-dihydroxy-7,3',5'-trimethoxyflavone) and four biflavones (amenthoflavone, 7,7"-o-dimethylamenthoflavone, heveaflavone and tetramethylamenthoflavone). the structures of the compounds were established by the analysis of 1h, 13c nmr spectra including bidimensional techniques. the classes of the identified metabolites are in agreement with previous studies of the ouratea genus.
Propuesta Metodológica Geohistórica para su aplicación en Geografía Política.
DUPUY, Héctor Adolfo
Técnica Administrativa , 2005,
Abstract: El estudio de la Geografía política tuvo su origen en la cuna misma de la Geografía moderna. Surgida a partir de los trabajos de Ratzel, a fines del siglo pasado, se ha vinculado en esta centuria a las escuelas anglosajona y alemana, siendo concebida como el estudio de un mundo dividido en Estados o, mejor aún, como el estudio del Estado mismo. Los estudios actuales se encaminan a analizarla en un contexto socioeconómico, vinculada a un sistema al cual podemos denominar "economía – mundo capitalista". Estos presupuestos teóricos nos permiten abordar la problemática político espacial a partir de la identificación de las bases culturales imperantes en el territorio en estudio, de las fuerzas económicas y sociales actuantes y de su representación concreta a través de las relaciones de poder entre las instituciones sociales. Además, los fenómenos político-geográficos surgen como una resultante de procesos seguidos a lo largo de una historia concreta del espacio en estudio. Esta metodología se enriquece con la utilización de cortes históricos de estudio espacial. Para comprenderla mejor se ha recurrido a su aplicación a un caso particular, el estudio espacio-temporal europeo y se ejemplifica a partir de uno de los cortes históricos, el correspondiente a la Revolución urbana y comercial en Europa (1453-1498).
O Brasil e os chamados blocos regionais
S?o Paulo em Perspectiva , 2002, DOI: 10.1590/S0102-88392002000100004
Abstract: contrary to expectations, the formation of competing trade blocks has not become a reality. today, brazil has the opportunity to play a larger role in two regional associations ? the ftaa and mercosul ? as well as in the inter-regional arrangement between mercosul and the european union. ftaa membership is the most important of the three, providing as it would a point of reference from which brazil can define its role in the world.
Da crian a ao menor
José Augusto Guilhon Albuquerque
Psicologia: Ciência e Profiss?o , 1986, DOI: 10.1590/s1414-98931986000200012
Essential oil composition of Croton palanostigma Klotzsch from north Brazil
Brasil, Davi do Socorro B.;Muller, Adolfo Henrique;Guilhon, Giselle Maria S. P.;Alves, Cláudio Nahum;Andrade, Eloísa Helena A.;Silva, Joyce Kelly R. da;Maia, José G. S.;
Journal of the Brazilian Chemical Society , 2009, DOI: 10.1590/S0103-50532009000600026
Abstract: the essential oils of leaves, twigs, branches, trunk bark and fruits of croton palanostigma were analyzed by gc and gc-ms. the main compounds found in the oil of the leaves were linalool (25.4%), (e)-caryophyllene (21.0%), methyleugenol (17.2%) and β-elemene (6.0%); in the oil of the twigs were α-pinene (41.4%), limonene (29.0%), sabinene (11.5%) and β-pinene (5.7%); in the oil of the branches were methyleugenol (24.1%), (e)-methylisoeugenol (15.3%), α-pinene (11.2%) and (e)-caryophyllene (8.5%); in the oil of the trunk bark were a-pinene (31.6%), methyleugenol (25.6%) and (e)-methylisoeugenol (23.7%); and in the oil of the fruits were linalool (42.7%), methyleugenol (16.3%) and β-elemene (6.4%). statistical analysis showed that the leaves and fruit, and the branches and trunk bark, have significant similarities between them. in addition, the trunk bark oil has high brine shrimp larvicidal activity (lc50, 3.71 ± 0.01 mg ml-1).
Synthesis of 2’-Modified Nucleotides
Mariana Gallo,Héctor Torres,Adolfo Iribarren
Molecules , 2000, DOI: 10.3390/50500727
Abstract: We show in this work the development of modified building blocks for the synthesis of nuclease resistant hammerhead ribozymes. These modified monomers retain the 2’-OH which is essential for the activity of these molecules. Our final goal is to generate a catalytic antisense approach with potential application in gene therapy.
Universality of Phase Transition Dynamics: Topological Defects from Symmetry Breaking
Adolfo del Campo,Wojciech H. Zurek
Physics , 2013, DOI: 10.1142/S0217751X1430018X
Abstract: In the course of a non-equilibrium continuous phase transition, the dynamics ceases to be adiabatic in the vicinity of the critical point as a result of the critical slowing down (the divergence of the relaxation time in the neighborhood of the critical point). This enforces a local choice of the broken symmetry and can lead to the formation of topological defects. The Kibble-Zurek mechanism (KZM) was developed to describe the associated nonequilibrium dynamics and to estimate the density of defects as a function of the quench rate through the transition. During recent years, several new experiments investigating formation of defects in phase transitions induced by a quench both in classical and quantum mechanical systems were carried out. At the same time, some established results were called into question. We review and analyze the Kibble-Zurek mechanism focusing in particular on this surge of activity, and suggest possible directions for further progress.
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