The Test. Tests for Epstein-Barr virus (EBV) antibodies are used to help diagnose infectious mononucleosis (mono) if a person is symptomatic but has a negative mono test.he Test. Tests for Epstein-Barr virus (EBV) antibodies are used to help diagnose infectious mononucleosis (mono) if a person is symptomatic but has a negative mono test.
leaf scar. (botany). A mark on a stem, formed by secretion of suberin and a gumlike substance, showing where a leaf has abscised. 1  Facebook. 2  Twitter.
Leaf Scorch. In the case of leaves turning brown, curling up, and falling off, leaf scorch may be the likely culprit. The obvious signs of leaf scorch are yellow and brown-like color changes on the tips and ends of tree leaves. These leaves will eventually curl up, wilt, and drop off. This disorder is also referred to as Leaf Wilt and Leaf Burn.