fixed nitrogen
21Diazotroph — Diazotrophs are bacteria and archaea that fix atmospheric nitrogen gas into a more usable form such as ammonia.[1] A diazotroph is an organism that is able to grow without external sources of fixed nitrogen. Examples of organisms that do this are …
22Soil life — or soil biota is a collective term for all the organisms living within the soil.OverviewIn a balanced soil, plants grow in an active and vibrant environment. The mineral content of the soil and its physical structure are important for their well… …
23Cyanobacteria — Temporal range: 3500–0 Ma Had n Archean …
24Metalloprotein — The structure of hemoglobin. The heme cofactor, containing iron, shown in green. Metalloprotein is a generic term for a protein that contains a metal ion cofactor.[1] Metalloproteins have many different functions in cells …
25Gunnera — Taxobox name = Gunnera image width = 240px image caption = Gunnera tinctoria at the San Francisco Botanical Garden at Strybing Arboretum regnum = Plantae divisio = Magnoliophyta classis = Magnoliopsida ordo = Gunnerales familia = Gunneraceae… …
26Beaver — Taxobox name = Beavers fossil range = Late Miocene – Recent image caption = American Beaver image width = 300px regnum = Animalia phylum = Chordata classis = Mammalia ordo = Rodentia familia = Castoridae genus = Castor genus authority = Linnaeus …
27Marine pollution — While marine pollution can be obvious, as with the marine debris shown above, it is often the pollutants that cannot be seen that cause most harm. Marine pollution occurs when harmful, or potentially harmful effects, can result from the entry… …
28Amino acid synthesis — For the non biological synthesis of amino acids see: Strecker amino acid synthesis Amino acid synthesis is the set of biochemical processes (metabolic pathways) by which the various amino acids are produced from other compounds. The substrates… …
29Wild fisheries — A fishery is an area with an associated fish or aquatic population which is harvested for its commercial value. Fisheries can be marine (saltwater) or freshwater. They can also be wild or farmed. This article is an overview of the habitats… …
30denitrifying bacteria — Soil microorganisms whose action results in the conversion of nitrates in soil to free atmospheric nitrogen, thus exhausting soil fertility and reducing agricultural productivity. Without denitrification, earth s nitrogen supply would eventually… …
