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Though much factual material is presented , I believe the series is stronger in its ability to force our consideration of the roles of reproductive technology than in providing us with easily assimilated information . Elucidation of the roles of ethanol and ethanol metabolites , coincident with other factors such as stress , infectious agents , nutritional supplements , iron , fat , antioxidant depletion , and regulatory peptides , inflammation , immune responses on the cell surface and molecular signaling cascades that lead to tissue injury . Advances have been rapid in clinical , nutritional , and biochemical understanding of the role of trace elements in human metabolism . Online learning may at first develop within specific , local areas ; with some rethinking of the roles of " teacher " and " learner " , the kind of distanceless proximity that characterizes online learning will perhaps lead to a renaming of the whole field , and " collaborative learning " will be generated . Whilst there is still , hopefully , time to effect things , I would argue for a radical redefinition of the role of libraries . Understanding of the role of these allergens in chronic rhinitis , asthma and atopic dermatitis requires accurate measurement of IgE antibodies and indoor exposure . There was also substantial discussion of the role of the IAB - - to what extent should it make decisions and to what extent should it provide technical guidance ? The three functionally unrelated characteristics were found to be correlated in the green algae and this pattern laid the foundation for an extraordinary contribution to our understanding of the role of the green algae among plants . In particular , there remains a view in some sectors that one of the roles of surveillance is to detect people with HIV infection for the purpose of subjecting them to direct intervention of some kind , sometimes even involving law enforcement activities .