False-colour SEM of oak heartwood
Numéro d’image : 11536432
| False-colour scanning electron micrograph of a horizontal section through oak heartwood,the wood (secondary xylem) of the tree Quercus robur. The image shows the cut end of a tracheary vessel which has become blocked by papery bladder-like ingrowths known as tyloses (yellow). In young sapwood the vessels carry water & nutrients from the roots to the leaves,but after a few years they become blocked & no longer carry sap. Large vessels like this occur in early (spring) wood; late-wood vessels are much smaller. The tissue surrounding the vessel is wood parenchyma,an unspecialised matrix tissue. Oak is classified as a hardwood. Magnification: x100 at 6x4.5cm size | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 3927 px × 4961 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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