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Results of bioassay experiments at three depths in Castle Lake in July 2008 for control (Cntrl), +nitrate (N), +molybdenum (Mo), and +nitrate +molybdenum (N + Mo) treatments: (A) nitrate reductase activity; (B) glutamine synthetase activity; (C) soluble protein content (“0” stands for undetectable activity and “nd” stands for “no data” “GH” stands for γ-glutamyl hydroxamate). After Glass (2011).
