Stinging nettle leaf. Coloured scanning electron micrograph (SEM) of a section through a freeze-fractured nettle (Urtica dioica) leaf,showing its cell structure. One pair of guard cells (lower centre) have fractured showing the stoma (pore) in cross section at their centre. Stomata are opened and closed in order to control gas exchange. Magnification x720 when printed 10 centimetres wide | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / PETER BOND, EM CENTRE, UNIVERSITY OF PLYMOUTH |
Taille de l’image : | 4925 px × 3553 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |