2631337 ENDB EPIC Nutrient Database 4 2631341 ENDB edge-notched disc bending samples 1 2631338 ENDB electroactive nitrifying/denitrifying bacteria 1 2631342 ENDB EPIC nutrient database project 1 2631339 ENDB estimated using a standardized nutrient database 1 2631340 ENDB European Nutrient Composition Database 1