de-nitrification

(noun)

A microbially facilitated process of nitrate reduction that may ultimately produce molecular nitrogen (N2) through a series of intermediate gaseous nitrogen oxide products.

Related Terms

Examples of de-nitrification in the following topics:

  • The Nitrogen Cycle

    • Nitrificaton: Nitrification is the conversion of ammonia (NH3) to nitrate (NO3-).
    • Nitrification is performed mainly by the genus of bacteria, Nitrobacter.
    • Nitrification can also work on ammonium.
    • It can either be cycled back into a plant usable form through nitrification or returned to the atmosphere through de-nitrification.
    • De-Nitrification: Nitrogen in its nitrate form (NO3-) is converted back into atmospheric nitrogen gas (N2) by bacterial species such as Pseudomonas and Clostridium, usually in anaerobic conditions.

  • Nitrification

    • Nitrification is an important step in the nitrogen cycle in soil.
    • Nitrification is an aerobic process performed by small groups of autotrophic bacteria and archaea.
    • The transformation of ammonia to nitrite is usually the rate limiting step of nitrification.
    • Nitrification also plays an important role in the removal of nitrogen from municipal wastewater.
    • The conventional removal is nitrification, followed by denitrification.

  • Psychrophilic Crenarchaeota

    • Nitrification , as stated above, is formally a two-step process; in the first step ammonia is oxidized to nitrite, and in the second step nitrite is oxidized to nitrate.
    • Crenarchaeote are abundant in the ocean and some species have a 200 times greater affinity for ammonia than AOB, leading researchers to challenge the previous belief that AOB are primarily responsible for nitrification in the ocean.
    • Nitrification is the biological oxidation of ammonia with oxygen into nitrite followed by the oxidation of these nitrites into nitrates.
    • Degradation of ammonia to nitrite is usually the rate limiting step of nitrification.
    • Nitrification is an important step in the nitrogen cycle in soil.

  • The Nitrogen Cycle

    • This process occurs in three steps in terrestrial systems: ammonification, nitrification, and denitrification.
    • Second, the ammonium is converted to nitrites (NO2−) by nitrifying bacteria, such as Nitrosomonas, through nitrification.
    • A similar process occurs in the marine nitrogen cycle, where the ammonification, nitrification, and denitrification processes are performed by marine bacteria.

  • Trigonometry and Complex Numbers: De Moivre's Theorem

  • Christine de Pizan

  • José de San Martín

  • Inverse Compton Power - Single Scattering

    • Let $v dE$ be the density of photons having energy in the range $dE$.
    • $\displaystyle \frac{v dE}{E} = \frac{v' dE'}{E'} = \text{ Lorentz Invariant} $
    • $\displaystyle \frac{d E_f}{d t} = c \sigma_T \int E'^2 \frac{v' dE'}{E'} = c \sigma_T \int E'^2 \frac{v dE}{E}$
    • $\displaystyle \frac{d E_f}{d t} = c \sigma_T \gamma^2 \int \left ( 1 - \beta \cos\theta \right )^2 E v dE = c \sigma_T \gamma^2 \left ( 1 + \frac{1}{3} \beta^2 \right ) U_\text{ph}$
    • $\displaystyle \frac{d E}{d t} = -c\sigma_T \int E v dE = -\sigma_T c U_\text{ph}$

  • Nitrospirae and Deferribacter

    • By a process known as nitrification, bacteria convert these waste products to less toxic forms.

  • The Role of Prokaryotes in Ecosystems

    • Nitrification is the conversion of ammonium to nitrite and nitrate.
    • Nitrification in soils is carried out by bacteria belonging to the genera Nitrosomas, Nitrobacter, and Nitrospira.