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One excuse for not making use of the visual sources is the difficulty in interpreting them. Before the historian can even try to make valid use of an image, he has to know what he is looking for, when and for what purpose it was made, in what circumstances, current visual conventions, technical and other constraints.1 Thus, extracting information from visual sources and combining it with literary
The biogeochemical cycling of silicon (Si) along the land-to-ocean continuum is studied by a variety of research fields and for a variety of scientific reasons. However, there is an increasing need to refine the methodology and the underlying assumptions used to determine biogenic silica (BSi) concentrations. Recent evidence suggests that contributions of nonbiogenic sources of Si dissolving durin
Channels were activated, in ripped-off patches from rat-cultured hippocampal neurons, by propofol alone, propofol plus 0.5 muM GABA (gamma-aminobutyric acid) or GABA alone. The propofol-activated currents were chloride-selective, showed outward-rectification and were enhanced by 1 muM diazepam. The maximum propofol-activated channel conductance increased with propofol concentration from less than
