RESUMO
Scanning electron microscope and energy-dispersive X-ray analysis were used to study the tissular distributions of elements Na, Mg, Cl, K, Ca, Mn, and Fe in leaves of cucumber seedlings in the absence or presence of La3+. The results showed that the atomic percentages of Na, Mg, Cl, K, and Ca were basically reduced and those of Mn and Fe were increased in the presence of La3+; in addition, at 0.02 mM La3+, the reduced or increased degrees were higher than those at 2.0 mM La3+. The effects of La3+ on ion absorption were similar to those of Ca2+, suggesting that the rare earth element lanthanum affects the plant physiological mechanism by regulating the Ca2+ level in plant cell.
Assuntos
Cucumis sativus/metabolismo , Lantânio/farmacologia , Oligoelementos/metabolismo , Cucumis sativus/efeitos dos fármacos , Cucumis sativus/crescimento & desenvolvimento , Microscopia Eletrônica de Varredura/métodos , Folhas de Planta/efeitos dos fármacos , Folhas de Planta/metabolismo , Sementes/efeitos dos fármacos , Oligoelementos/análise , Raios XRESUMO
The abscisic acid (ABA) content of the root tips of four crops grown in lanthanide chloride solution and their root lengths had been determined. At lanthanide concentrations of 5 and 10 ppm, these crops all grew well and the ABA decreased. At higher lanthanide concentrations (100-500 ppm), the ABA is increased again. At these concentrations of lanthanum chloride, the photosystems I and II (PSI and PSII) and whole electron chain transport activities were inhibited. PSII was more sensitive than PSI, and it is concluded that La3+ acts on the diphenylcarbazide (DPC) action place of PSII oxidizing site.
Assuntos
Ácido Abscísico/metabolismo , Cucumis sativus/efeitos dos fármacos , Grão Comestível/metabolismo , Glycine max/efeitos dos fármacos , Lantânio/farmacologia , Transporte Biológico/efeitos dos fármacos , Cloroplastos/efeitos dos fármacos , Cloroplastos/metabolismo , Cucumis sativus/crescimento & desenvolvimento , Cucumis sativus/metabolismo , Grão Comestível/efeitos dos fármacos , Elétrons , Oxigênio/metabolismo , Complexo de Proteínas do Centro de Reação Fotossintética/efeitos dos fármacos , Complexo de Proteínas do Centro de Reação Fotossintética/metabolismo , Glycine max/metabolismo , Triticum/efeitos dos fármacos , Triticum/metabolismo , Zea mays/efeitos dos fármacos , Zea mays/metabolismoRESUMO
RE(III) complexes of Naproxen(HNap) have been synthesized and characterized by elemental analyses, conductance measurements, solubilities, thermal analysis, infrared, proton magnetic resonance, and electronic spectral data. The elemental analyses reveal the presence of 1:3 (metal:ligand) stoichiometry and the IR spectra suggest the carboxylate group of HNap functions, as a bridging ligand to coordinate to RE(III) ions. The electronic spectra recorded in solid exhibit only slight shifts in visible regions, on which beta, delta and b1/2 of covalent parameters have been calculated. Formalin-induced rat paw edema and croton oil-induced rat ear edema inflammatory models were chosen to examine the antiinflammatory activity of Nd(III) complex, which ascertained enhanced antiinflammatory activity relative to the ligand.
