Subject permeation profiles

Smith et al. (1989, 1991) exposed Lemna minor to 5lCr(VI) in the form of chromate and demonstrated that extracts showed Cr associated with complexes of about 2000 D and > 100000 D. Aqueous extracts were subjected to gel permeation chromatography (Sephadex G50) and both 51Cr and protein activity were followed. Although the Cr fractions corresponded to protein fractions, the authors were unable to demonstrate that these were Cr-induced proteins, since the protein profiles for Cr-treated and untreated plants were the same. Clearly more work is required on the chemical identification of metal complexes in such extracts. 

Temperature profiles along the different sections of the MREF, at various radial positions, (a) Along the total length of the reactor for reforming section and hot gas section at different radial positions and (b) detailed analysis of the profiles in the reformer inlet region, where the feed inlet is subjected to a steep temperature drop (HG, hot gas Ref, reformer Perm, permeate). 

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