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Search Results: 1 - 10 of 829636 matches for " Ana M. G. A.;Magalh?es "
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New spectral data of some flavonoids from Deguelia hatschbachii A.M.G. Azevedo
Magalhes, Aderbal F.;Tozzi, Ana M. G. A.;Magalhes, Eva G.;Moraes, Valéria R. de S.;
Journal of the Brazilian Chemical Society , 2003, DOI: 10.1590/S0103-50532003000100022
Abstract: from the roots of deguelia hatschbachii, the known flavonoids scandenin (1), methyl robustate (2) and 4',5- dihydroxy-6-(3,3-dimethylalyll)-7-methoxy flavanone (3) were isolated and characterized by comparison of their spectroscopic data with those found in the literature. now the inclusion of 1d- and 2d-nmr and ms/ms data has allowed the complete assignment of all hydrogen and carbon chemical shifts in their nmr spectra, as well as the elucidation of the fragmentation pathways of 1-3 in the mass spectrometer.
Flavonoids from Lonchocarpus muehlbergianus
Magalhes Aderbal F.,Tozzi Ana M.G.A.,Magalhes Eva G.,Blanco Ivani S.
Anais da Academia Brasileira de Ciências , 2004,
Abstract: The light petroleum extract from the roots of Lonchocarpus muehlbergianus Hassl contained nine flavonoids, including six new ones. These are 2,4-cis-2,4,5,8-tetramethoxy-(2,3:6,7)-furanoflavan; 2,4-cis-4-hydroxy-2,5,8-trimethoxy-(2,3:6,7)-furanoflavan; 2,4-cis-2-prenyloxy-4,5,8-trimethoxy-(2,3:6,7)-fu-ranoflavan; 2,4-cis-2-prenyloxy-4-hydroxy-5,8-dimethoxy-(2,3:6,7)-furanoflavan; 2',5',6'-trimethoxy-9-(1,1-dimethylallyoxy)-[2,3:3,4]-furanochalcone; 5,6-dimethoxy-(2,3:7,8)-furanoflavone, identi-fied by analysis of their spectral data (UV, IR, 1H and 13C NMR, 2D-NMR, NOE and MS). The natural occurrence of 2,4-dioxygenated flavan derivatives is being reported for the first time. Quantitative analysis of the petrol extract, by using reversed-phase HPLC, showed that the most abundant flavonoid in the extract is 2,4-cis-2,4,5,8- tetramethoxy-(2,3:6,7)-furanoflavan.
New spectral data of some flavonoids from Deguelia hatschbachii A.M.G. Azevedo
Magalhes Aderbal F.,Tozzi Ana M. G. A.,Magalhes Eva G.,Moraes Valéria R. de S.
Journal of the Brazilian Chemical Society , 2003,
Abstract: From the roots of Deguelia hatschbachii, the known flavonoids scandenin (1), methyl robustate (2) and 4',5- dihydroxy-6-(3,3-dimethylalyll)-7-methoxy flavanone (3) were isolated and characterized by comparison of their spectroscopic data with those found in the literature. Now the inclusion of 1D- and 2D-NMR and MS/MS data has allowed the complete assignment of all hydrogen and carbon chemical shifts in their NMR spectra, as well as the elucidation of the fragmentation pathways of 1-3 in the mass spectrometer.
Flavonoids from Lonchocarpus muehlbergianus
Magalhes, Aderbal F.;Tozzi, Ana M.G.A.;Magalhes, Eva G.;Blanco, Ivani S.;Soriano, Maria-Del-Pilar C.;
Anais da Academia Brasileira de Ciências , 2004, DOI: 10.1590/S0001-37652004000400004
Abstract: the light petroleum extract from the roots of lonchocarpus muehlbergianus hassl contained nine flavonoids, including six new ones. these are 2,4-cis-2,4,5,8-tetramethoxy-(2′′,3′′:6,7)-furanoflavan; 2,4-cis-4-hydroxy-2,5,8-trimethoxy-(2′′,3′′:6,7)-furanoflavan; 2,4-cis-2-prenyloxy-4,5,8-trimethoxy-(2′′,3′′:6,7)-fu-ranoflavan; 2,4-cis-2-prenyloxy-4-hydroxy-5,8-dimethoxy-(2′′,3′′:6,7)-furanoflavan; 2',5',6'-trimethoxy-9-(1,1-dimethylallyoxy)-[2′′,3′′:3′,4′]-furanochalcone; 5,6-dimethoxy-(2′′,3′′:7,8)-furanoflavone, identi-fied by analysis of their spectral data (uv, ir, 1h and 13c nmr, 2d-nmr, noe and ms). the natural occurrence of 2,4-dioxygenated flavan derivatives is being reported for the first time. quantitative analysis of the petrol extract, by using reversed-phase hplc, showed that the most abundant flavonoid in the extract is 2,4-cis-2,4,5,8- tetramethoxy-(2′′,3′′:6,7)-furanoflavan.
Influência do auxílio mecanico na colheita de tomates
Sanchez, Augusto C.;Ferreira, Marcos D.;Magalhes, Ana M. de;Braunbeck, Oscar A.;Cortez, Luis A. B.;Magalhes, Paulo S. G.;
Engenharia Agrícola , 2006, DOI: 10.1590/S0100-69162006000300011
Abstract: fresh tomato harvest is traditionally made without harvesting aids. the main goal of this research was to evaluate performance parameters of fresh tomato harvesting aid equipment and compare it to traditional harvest, in the state of s?o paulo. therefore, an equipment was developed and the harvest process was evaluated in four different ways: traditional system (harvest system used in santa luzia farm, brotas, sp, brazil), picker walking with a harvesting aid equipment, picker seated in a harvesting aid equipment and a composition of both systems: two pickers seated and one picker walking in two different velocities ranges. the different systems using harvesting aid showed an average yield by picker more efficient than reference. harvest system using three pickers showed an increase of 290% on yield average by picker, on the range of 0.5-1.0 fruit per plant, followed by the systems with a walking picker, that increased productivity in 41%, and picker seated harvester, that showed an increase of 35%. these results demonstrate the importance of using a harvesting aid equipment.
Esquistossomose mans?nica em camundongos experimentalmente subnutridos
Magalhes,Luiz Augusto; Guaraldo,Ana Maria A.; Zanotti-Magalhes,Eliana M.; Carvalho,José F. de; Sgarbieri,Valdomiro C.; Alcantara,Francisco G. de;
Revista de Saúde Pública , 1986, DOI: 10.1590/S0034-89101986000500005
Abstract: mansoni schistosomiasis was studied in mice fed on a low protein diet. four groups of the swiss breed mus musculus were used in an experiment with two factors, each with two levels: 1-non-infected, normal diet; 2 - infected, normal diet ; 3 - non-infected, low protein diet; 4 - infected, low protein diet. the mice were killed for observation at age 90 days, after 60 days of infection, for those infected. it was found that the worms suffered the effects of malnutrition, mainly males, whose population count was cut by half, in addition to poor individual growth. the hepatic granuloma count was found to be smaller in the undernourished group; while the corresponding lesions were also generally smaller. there was a marked leukopenia in the malnourished mice, even more so in the infected mice. the severe lymphopenia and eosinopenia observed suggest that the immunologic system of the host was affected by malnutrition. mortality rates were far larger in the infected, low protein diet group. one may then surmise that the malnourished mice offered lower resistance to the infection, their lower number of granuloma notwithstanding.
Bleaching Gels Containing Calcium and Fluoride: Effect on Enamel Erosion Susceptibility
Alessandra B. Borges,Carlos R. G. Torres,Paulo A. B. de Souza,Taciana M. F. Caneppele,Luciana F. T. F. Santos,Ana Carolina Magalhes
International Journal of Dentistry , 2012, DOI: 10.1155/2012/347848
Abstract: This in vitro study evaluated the effect of 35% hydrogen peroxide (HP) bleaching gel modified or not by the addition of calcium and fluoride on enamel susceptibility to erosion. Bovine enamel samples (3?mm in diameter) were divided into four groups ( ) according to the bleaching agent: control—without bleaching (C); 35% hydrogen peroxide (HP); 35% HP with the addition of 2% calcium gluconate (HP + Ca); 35% HP with the addition of 0.6% sodium fluoride (HP + F). The bleaching gels were applied on the enamel surface for 40?min, and the specimens were subjected to erosive challenge with Sprite Zero and remineralization with artificial saliva for 5 days. Enamel wear was assessed using profilometry. The data were analyzed by ANOVA/ Tukey’s test ( ). There were significant differences among the groups ( ). The most enamel wear was seen for C ( ?μm), followed by HP ( ?μm) and HP + F ( ?μm). HP + Ca ( ?μm) was the only group able to significantly reduce enamel erosion compared to C. The application of HP bleaching agent did not increase the enamel susceptibility to erosion. However, the addition of calcium gluconate to the HP gel resulted in reduced susceptibility of the enamel to erosion. 1. Introduction Tooth whitening is a highly desirable esthetic treatment, as the tooth color is one of the most important factors related to the patients’ satisfaction with their appearance [1]. Dental bleaching treatments are mainly based on the action of hydrogen peroxide, which is able to penetrate the tooth structure and release free radicals, oxidizing the chromophore molecules. Such molecules are mainly organic, although inorganic molecules can also be affected by these reactions [2]. Nevertheless, the free radical reaction is not specific and it may also alter the organic component of enamel [3]. Since the organic content contributes to the integrity of enamel, different adverse effects on both mineral and organic parts of bleached enamel have been observed [3]. Alterations in enamel surface morphology [3–6], chemical composition [7–10], and microhardness values [3, 11, 12] after bleaching were previously reported. Furthermore, some changes in bleached enamel were also described as slight erosive effects promoted by the bleaching agent [6, 13]. Nevertheless, some authors claim that the erosive pattern on the surface of bleached enamel only occurs when bleaching gels with low pH are used [14, 15]. Attempts to minimize the adverse effects of bleaching treatments by increasing enamel remineralization have been conducted, however, the results are contradictory. De Oliveira
Tratamento do transtorno dismórfico corporal com venlafaxina: relato de caso
Amancio, Edson José;Magalhes, Catulo César P;Santos, Ant?nio Carlos G;Peluso, Cássio M;Pires, Mara Fernanda C;Pe?a-Dias, Ana Paula;
Revista Brasileira de Psiquiatria , 2002, DOI: 10.1590/S1516-44462002000300008
Abstract: a body dysmorphic disorder (bdd) patient who responded preferentially to venlafaxine is described. a literature review was carried out, and the paper also discusses the similarities and differences between bdd and obsessive-compulsive disorder.
Gene Expression Profiling during Early Acute Febrile Stage of Dengue Infection Can Predict the Disease Outcome
Eduardo J. M. Nascimento,Ulisses Braga-Neto,Carlos E. Calzavara-Silva,Ana L. V. Gomes,Frederico G. C. Abath,Carlos A. A. Brito,Marli T. Cordeiro,Ana M. Silva,Cecilia Magalhes,Raoni Andrade,Laura H. V. G. Gil,Ernesto T. A. Marques Jr
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0007892
Abstract: We report the detailed development of biomarkers to predict the clinical outcome under dengue infection. Transcriptional signatures from purified peripheral blood mononuclear cells were derived from whole-genome gene-expression microarray data, validated by quantitative PCR and tested in independent samples.
Chemical indexes calculated for 8,11,13-trien-abietane diterpenoids isolated from Swartzia species
Magalhes, A. F;Tozzi, A. M. G. A;Santos, C. C;Magalhes, E. G;
Eclética Química , 2010, DOI: 10.1590/S0100-46702010000300017
Abstract: the disparity found in the molecular structures of compounds isolated from nine plants of the swartzia genus indicates that the swartzia species that furnished cassane diterpenoids and triterpenoidal saponins are more recent, since these metabolites have adopted the mevalonic acid route of formation, abandoning the shikimic acid/acetate route that produces the isoflavonoids found in the remaining species. chemical indexes calculated from the molecular structure diversities of sixteen 8,11,13-trien-abietane diterpenoids isolated from swartzia langsdorffii and s. arborescens indicate that s. arborescens is more recent than s. langsdorffii. the results suggest a more evolved position in swartzia species of the section possira.
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