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.
Ash fruits (left: white ash, right: green ash) Click on an image for further information about it. Leaves Ash leaves are pinnately compound. That means that the leaflets are arranged in rows on opposite sides of the central stem (rachis) of the leaf. White and green ash leaves typically have 5 to 9 leaflets, while blue ash typically has 7 to 11 leaflets. There are a number of common tree species that have leaves like this. However, most of them have leaves that are arranged alternately on the twig, whereas ash tree leaves are arranged oppositely on the twig.