Data Views Exclude Ubiquitous Chemicals Activities: 756 Chemicals w/Activities: 161 CSV Excel PDF All Chemicals: 238 Previous123456789 Show all rows. Paginate rows. Click on column headings to sort table by that column # Activity Chemical Part All Essential Oil Inflorescence Leaf Plant Seed Shoot Low PPM High PPM StdDev *Reference 77 77 ZINC Leaf 0.3 1.5 -0.52 * *Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.