Nitrogen fixing nodules on a clover root
Numéro d’image : 13471186
| Scanning electron micrograph of nitrogen-fixing nodules on a root of clover, Trifolium repens. The picture shows two nodules arising from the (horizontal, brown) root; one, to left, small, not fully developed, and an active nodule, 2.5mm high (centre, pink). They are the plant's reaction to infection by the soil bacterium Rhizobium leguminosarum. Inside an active nodule, the bacterium is able to fix"" atmospheric nitrogen, producing ammonium salts. This is an example of symbiosis (mutualism); the bacterium benefits from plant carbohydrates made by photosynthesis; the plant benefits from the fixed nitrogen. Artificial fertilisers contain nitrogen as ammonium or nitrates. Leguminous crops require less use of chemical fertilisers. Bacteria - mainly Rhizobium spp - fix 150-200 million tonnes/yr of nitrogen; approximately three times the output of the global chemical fertiliser industry" | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 3468 px × 5212 px |
| Model Release : | Non requis |
| Restrictions : | - |
Prix pour cette image À partir de 45 €
Produit vendu
(Calendrier, Carte postale, Carte de vœux, Impression sur textile, Packaging etc)
À partir de 45 €
Usage commercial
(Affichage, Annonce presse, Annonce TV, Carte, Digital - hors rés. sociaux, Digital - rés. sociaux etc)
À partir de 45 €
Éditorial
(Digital, Journal, Livre, Livre pratique, Magazine, Télévision etc)
À partir de 60 €
Usage non-commercial
(Digital - hors rés. sociaux, Digital - rés. sociaux etc)
À partir de 120 €