Acide humen: Ni uruvange rwa kama rutandukanye-rufite imbaraga za molecular rwakozwe na pelecposition no guhindura ibisigazwa by'inyamaswa n'ibimera binyuze muri mikorobe n'ibice birebire bya geologyasil n'imiti. Birakungahaye mumihanda itandukanye ikora nka Carboxyl, Hydroxyl, uburyo, karubone, na quinone.

Acino aside nizina rusange ryishuri ryibice kama zirimo amatsinda ya amino na carboxyyl. Nibintu byibanze byubaka bya poroteyili yimiterere ya poroteyine nibintu byibanze bigize poroteyine zisabwa ku nyamaswa no gutera imirire.

Inyandiko zo gukura gukura zisanzwe zirimo uburinganire bwimbuto, gushinga imizi, bimera, amababi, indabyo nibindi byiciro. Impinduka muri buri cyiciro zirashobora kwandikwa muburyo burambuye binyuze mubyifuzo bikomeza. ‌

Ifumbire mvaruganda ingana n'amazi akungahaye muri azote, fosifate, possasiyumu n'ibindi bintu bisabwa mu iterambere ry'ibihingwa kandi birashobora guteza imbere gukura no guteza imbere indwara.