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Nodule
A nodule is a lump or swelling. A nodule can be benign or ...
Noise
Noise is a random phenomenon. There are two particularly ...
Noise pollution
When noise pollution caused by human activities ...
Noma
Noma is a form of gangrene, that is tissue necrosis which ...
Non repudiation
Non repudiation prevents the denial of old actions or messages.
Non-essential amino acids
The non-essential amino acids are amino acids which can be ...
Non-opiate analgesic
Non-morphine (or non-opiate) analgesics are the first step ...
Non-selective, monoamine oxidase inhibitor.
The non-selective monoamine oxidase inhibitors (MAOI) were ...
Non-spectral colour
A non-spectral colour is a colour that is not in the ...
Non-woven
Non-woven wallpaper, or Décofibre, is created from fibre, as ...
Nonlinear crystal
A nonlinear crystal is one which has a nonlinear ...
Nordmann fir
The Nordmann fir is a conifer that can reach heights of 40 ...
Norite
Norite is basic grained igneous rock, a variety of gabbro ...
Norway maple
The Norway maple is especially known for its spectacular ...
Nosocomial
An infection or a disease is described as nosocomial if it ...
Notonecta
Notonecta is an aquatic bug that breathes at the water’s surface.
Nova
A nova is an exploding star; its brightness increases ...
Nozzle
A nozzle is a pipe or tube of varying cross-sectional area ...
NRO
The (National Reconnaissance Office) is an organisation ...
NTSC
NTSC: National Television System Committee. NTSC is the ...
Nuclear fission
Nuclear fission is the splitting of an unstable nucleus into ...
Nuclear fusion
In nuclear fusion, two or more light atomic nuclei come ...
Nuclear moderator
In a nuclear reactor, the moderator slows down the neutrons ...
Nuclear power plant
A nuclear power plant produces electricity using the nuclear ...
Nuclear reaction
A nuclear reaction is a phenomenon in which atomic nuclei ...
Nuclease
A nuclease is an enzyme which can cleave nucleic acids at ...
Nucleation
Nucleation is the appearance of the first crystal seeds or ...
Nucleic acid
The term nucleic acid refers to a substance formed from a ...
Nucleic acids
DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).
Nucleolinus
The nucleolinus is a eukaryotic cell structure which is ...
Nucleolus
The nucleolus is a eukaryotic cellular organelle located in ...
Nucleon
A nucleon is a baryon. Nucleons are one of the constituents ...
Nucleophile
A nucleophile is a substance with an excess negative charge ...
Nucleoside
A nucleoside is the constituent part of nucleic acids (DNA ...
Nucleoside diphosphate
A nucleoside diphosphate is a molecule formed by a purine or ...
Nucleoside monophosphate
A nucleoside monophosphate is a molecule formed by a purine ...
Nucleoside triphosphate
A nucleoside triphosphate is a molecule formed by a purine ...
Nucleosome
The nucleosome is a group of histone proteins around which a ...
Nucleosynthesis
Nucleosynthesis is the creation of new elements by nuclear ...
Nucleotide
A nucleotide is the building block for nucleic ...
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