passages.id: split_6_test_1101_passage
passages.type: progene_text
passages.text: In situ 31P-NMR on small leaf pieces perfused with well - oxygenated medium showed only 0.036 mg P g-1 DW polyphosphate that was , however , greatly increased upon treatment with 50 mM ammonium sulfate at pH 7.3 .