This investigation was undertaken to seek quantitative information concerning the relative activity of certain enzymes in hepatic cells in various parts of the lobule. The enzymes selected for study are chiefly those with important nwtabohc roles.

In the analysis of plant samples containing a small quantity (5 to 200 micrograms) of nitrogen, it was essential to have an accurate method reproducible from day to day. The colorimetric nesslerization method developed makes possible reproducible results by the careful control of variables. The most

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