Lignin is a poorly characterized polymer and its exact properties vary depending on both the species of the plant and its location within the plant.Three classes of lignins taken from alfalfa stem were examined.The investigation Program Sticker was concentrated on the determination of chemical changes in the lignins during growth and development by
This is an action research advanced in a sixth grade, with the aim of improving project based learning.Results are analyzed using five categories: estrategies of students researchers, group work, resources, teacher preparation, and evaluation.Conclusions indicate that the design for change developed allowed students the enactment, with more or less
The relationship between muscle strength and oestrogen is ambiguous and is still largely unresolved.The evidence for and against an effect of oestradiol on determinants of muscle function is equivocal and often contradictory.The bulk of the research in this area was performed during the eighties and nineties, using models of reproductive functionin