Recalcitranium
Recalcitrant (biological persistence ) is the structural chemical stability of organic compounds. Compounds with a high recalcitrant content are difficult to break down simply because of their molecular structure. Usually these are extremely complex macromolecules , such as lignins or tannins .
One differentiates:
- Primary recalcitrance : Primary recalcitrance is present when it is a question of compounds that come directly from structural cells of plants. Examples are lignins, tannins, waxes .
- Secondary recalcitrance : Secondary recalcitrance is present when the compounds are formed from organic material. The skill
- intracellular microbial products such as chitin or melanins ,
- extracellular neoplasms, such as humic substances , or
- "Black carbon" compounds ( pyrogenic carbon ) such as charcoal or soot particles.
Individual evidence
- ↑ Entry on persistence. In: Römpp Online . Georg Thieme Verlag, accessed on August 23, 2018.
- ↑ Bernd Marschner, Sonja Brodowski u. a .: How relevant is recalcitrance for the stabilization of organic matter in soils ?. In: Journal of Plant Nutrition and Soil Science. 171, 2008, p. 91, doi : 10.1002 / jpln.200700049 .
- ↑ Markus Kleber: What is recalcitrant soil organic matter ?. In: Environmental Chemistry. 7, 2010, p. 320, doi : 10.1071 / EN10006 .