Tinted SEM of Quercus robur
Numéro d’image : 11536425
| False-colour scanning electron micrograph of oak heartwood,the wood (secondary xylem) of Quercus robur,showing both vertical (bottom) & horizontal (top) cut surfaces. The large,vertical tube-like structures are tracheary vessels which have become blocked by bladder-like ingrowths known as tyloses. 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. The large vessels occur in early (spring) wood; the small,dark circles at top are the cut ends of the smaller late-wood vessels. A broad ray,split due to drying,is seen at top. Oak is graded as a hardwood. Mag: x8 at 35mm size | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 5043 px × 3535 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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