PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 19053540-4 2008 In particular, the quantum yield (phi) of nitrite formation was measured and found to significantly decrease at high concentrations of nitrate for Ca(NO(3))(2). Nitrites 42-49 glucose-6-phosphate isomerase Homo sapiens 34-37