Al-sensitive (als) mutants of Arabidopsis were isolated and characterized with the aim of defining mechanisms of Al toxicity and resistance. Most als mutants selected on the basis of root growth sensitivity to Al were recessive, and together the mutants constituted eight complementation groups. Also, in most als mutants, Al sensitivity appeared to be specific for Al relative to La (another triv...

In this work, the relationship between the molecular structure of three flavonoids (kaempferol, quercetin and morin), their relative location in microheterogeneous media (liposomes and erythrocyte membranes) and their reactivity against singlet oxygen was studied. The changes observed in membrane fluidity induced by the presence of these flavonoids and the influence of their lipophilicity/hydro...

Devido à atividade farmacológica dos flavonóides, na presente investigação, foi desenvolvido um método eficiente e econômico para a determinação de traços dos mesmos. Neste contexto, o comportamento interfacial de três flavonóides, 3-hidroxiflavona (3HF), morin e hesperidina (Hesp) foi estudado em eletrodo de gota pendente de mercúrio (HMDE) por voltametria ac (fase sensível) e voltametria cícl...

The effects of several naturally occurring and synthetic flavonoids on the metabolism of benzo(a)pyrene and aflatoxin B1 were evaluated. Addition of apigenin, chrysin, fisetin, flavonone, galangin, hesperitin, kaempferol, morin, myricetin, haringenin, or quercetin to human liver microsomes inhibited the hydroxylation of benzo(a)pyrene. In contrast to these results, the addition of flavone, nobi...

Combining the “method of restriction equations” of Rimányi et al. with the techniques of symmetric functions, we establish the Schur function expansions of the Thom polynomials for the Morin singularities A3 : (C •, 0) → (C, 0) for any nonnegative integer k.

Combining the “method of restriction equations” of Rimányi et al. with the techniques of symmetric functions, we establish the Schur function expansions of the Thom polynomials for the Morin singularities A3 : (C •, 0) → (C, 0) for any nonnegative integer k.

O paradigma emergente ou da complexidade depara-se, no contexto pandêmico, com novos desafios. Edgar Morin, em Os sete saberes necessários para a educação do futuro elenca proposições elementares lidar os problemas que afetam sistemas educacionais desde o advento pensamento newtoniano-cartesiano. Nesse sentido, objetivo presente artigo foi identificar aspectos obra nos quais é possível vislumbr...