RESUMO
The role of fluoride ions on the corrosion behavior of some commercial dental amalgam in artificial saliva solution at pH level 7.1 was studied by using impedance and potentiodynamic polarization techniques. It was found that, the presence of F- ions in an artificial saliva solution at pH 7.1 increases the corrodability of different types of dental amalgam. Sever pitting corrosion occurred at level of 100 mM F- ions. The formulation of amalgam alloys greatly affect the resistance to pitting corrosion; the resistance of the amalgam to pitting follows the order: Dispersalloy >> Phasealloy > Oralloy > Tytin > Valiant-pH.D. It is recommended to avoid oral treatment involving high F- ions concentration in the presence of amalgam restorations.
Assuntos
Amálgama Dentário/química , Fluoreto de Sódio/farmacologia , Corrosão , Ligas Dentárias/química , Condutividade Elétrica , Concentração de Íons de Hidrogênio , Oxirredução , Potenciometria , Saliva ArtificialRESUMO
Two new pyrrole alkaloids, solsodomine A and B, were isolated from the fresh berries of Solanum sodomaeum L., collected from the Libyan desert. The structures of these compounds were established by 2D-NMR, including 15N NMR spectroscopy and chemical degradation. Solsodomine A (1) shows activity against Mycobacterium intracellulare. This is the first report of pyrrole alkaloids from the genus Solanum.
Assuntos
Antibacterianos/química , Plantas Medicinais/química , Alcaloides de Solanáceas/química , Antibacterianos/isolamento & purificação , Antibacterianos/farmacologia , Sequência de Carboidratos , Líbia , Espectroscopia de Ressonância Magnética , Espectrometria de Massas , Testes de Sensibilidade Microbiana , Dados de Sequência Molecular , Mycobacterium/efeitos dos fármacos , Alcaloides de Solanáceas/isolamento & purificação , Alcaloides de Solanáceas/farmacologia , Espectrofotometria Infravermelho , Espectrofotometria UltravioletaRESUMO
An aqueous extract of Cynomorium coccineum was administered by stomach tube to ten mature male Wistar rats, at a dose of 47 mg/100 kg body weight/day for 14 consecutive days. Ten rats were kept as controls and received normal saline by oral route at the same dosing interval. Sperm was collected from the epididymes after decapitation. The results revealed that the water extract of the Cynomorium coccineum induced significant increase in the sperm count, improved the percentage of live sperm and their motility and decreased the number of abnormal sperm. Testicular histology showed increased spermatogenesis and seminiferous tubules full of sperm in the treated group compared with the controls.