Search results
Results from the WOW.Com Content Network
Some nitrogen-fixing bacteria have symbiotic relationships with plants, especially legumes, mosses and aquatic ferns such as Azolla. [4] Looser non-symbiotic relationships between diazotrophs and plants are often referred to as associative, as seen in nitrogen fixation on rice roots. Nitrogen fixation occurs between some termites and fungi. [5]
The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmospheric, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation ...
Nitrogenase. Nitrogenases are enzymes (EC 1.18.6.1 EC 1.19.6.1) that are produced by certain bacteria, such as cyanobacteria (blue-green bacteria) and rhizobacteria. These enzymes are responsible for the reduction of nitrogen (N 2) to ammonia (NH 3). Nitrogenases are the only family of enzymes known to catalyze this reaction, which is a step in ...
An important role in maturation of Mo-Fe nitrogenase plays the so-called P-cluster. [48] Synthesis of nitrogenase is controlled by the nif genes. [49] Nitrogen fixation is regulated by the enhancer protein NifA and the "sensor" flavoprotein NifL which modulates the activation of gene transcription of nitrogen fixation by redox-dependent ...
Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. [1] Under nitrogen -limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia. [2] This process has evolved multiple times within the legumes, as well as in ...
Heterocysts abandon oxygen-producing photosynthesis in order to fix nitrogen with the oxygen-sensitive enzyme nitrogenase. Vegetative and heterocyst cells divide labor by exchanging sugars and nitrogen. The bacteria may also enter a symbiotic relationship with certain plants. In such a relationship, the bacteria do not respond to the ...
Nitroplast. A nitroplast is an organelle found in certain species of algae, particularly in the marine algae Braarudosphaera bigelowii. [1] It plays a crucial role in nitrogen fixation, a process previously thought to be exclusive to bacteria and archaea. [1][2] The discovery of nitroplasts has significant implications for both cellular biology ...
Nitrobacter play an important role in the nitrogen cycle by oxidizing nitrite into nitrate in soil and marine systems. [2] Unlike plants, where electron transfer in photosynthesis provides the energy for carbon fixation, Nitrobacter uses energy from the oxidation of nitrite ions, NO 2 −, into nitrate ions, NO 3 −, to fulfill their energy needs.