"Dicotyledon vascular bundle, SEM" - HD 映像素材

"Animated scanning electron micrograph (SEM) of a section through a vascular bundle from a dicotyledonous plant. A vascular bundle is a part of the transport system in vascular plants. The transport itself happens in vascular tissue, which exists in two forms: xylem (containing tracheids, larger vessels) and phloem (containing sieve tubes, smaller vessels)."