Is nitrite a good electron donor?

This is the first known microbial mechanism for the stoichiometric oxidation of nitrite to nitrate in the absence of oxygen and the only known photosynthetic oxidation in the nitrogen cycle. This work demonstrates nitrite as the highest-potential electron donor for anoxygenic photosynthesis known so far.

Does denitrifying bacteria need light?

Denitrifying bacteria use all three energy sources available to bacteria including organic carbon compounds (organotrophs), inorganic compounds (lithotrophs), and light (phototrophs).

Does light affect nitrite levels?

Light is an additional environmental factor shown to affect nitrite accumulation in nitrifying consortia (1, 2, 13, 21, 24).

Is ammonia an electron acceptor or donor?

Ammonia is generally thought to be an electron donor.

What can Organotrophs use as an electron source?

In the present day biosphere, the most common electron donors are organic molecules. Organisms that use organic molecules as an energy source are called organotrophs. Organotrophs (animals, fungi, protists) and phototrophs (plants and algae) constitute the vast majority of all familiar life forms.

Is nitrite an electron acceptor?

Here via DNA-stable isotope probing, we report that nitrate and nitrite provided as electron acceptors in different concentrations and ratios not only modulated the microbial communities responsible for toluene degradation but also influenced how nitrate reduction proceeded.

What is nitrite respiration?

Abstract. Nitrite is widely used by bacteria as an electron acceptor under anaerobic conditions. In respiratory nitrite ammonification an electrochemical proton potential across the membrane is generated by electron transport from a non-fermentable substrate like formate or H2 to nitrite.

What is the role of lightning in the nitrogen cycle?

As lightning blasts through the atmosphere, it breaks apart nitrogen molecules. This allows them to combine with oxygen in the air to form nitrogen oxides. The rain dissolves these into nitrates, then carries them to Earth and into the soil.

What is nitrifying and denitrifying bacteria?

Nitrifying bacteria are bacterial species which are capable of oxidizing ammonium in the soil to nitrates, which could be utilized by plants. Denitrifying bacteria are bacterial species which are capable of reducing nitrates or nitrites to gaseous forms such as nitrous oxide or diatomic nitrogen.

Does beneficial bacteria need light?

Beneficial bacteria grow fast in the dark, which is why turning off the lights. However, it is not the best idea to keep the lights off all the time since light makes it easier to see what is going on inside your aquarium as you pass by, but make sure they are off during the cycle.

Does the reduction of nitrate to ammonium depend on light?

Another reason light regulates nitrate metabolism is that the expression of NR is controlled by light. NR is the most important and most limiting step in nitrogen metabolism [27].