Définition et Signification de "nucleus"

Nucleus

NOM

noyau

(biology) the part of a cell that contains most of the genetic information

Example

The nucleus of a cell contains genetic material in the form of DNA, which regulates cellular activities.

The nucleus is surrounded by a double membrane called the nuclear envelope, which controls the passage of materials into and out of the nucleus.

Within the nucleus, there is a dense region called the nucleolus, where ribosomal RNA ( rRNA ) is synthesized and assembled into ribosomes.

noyau, groupe essentiel

a small group of indispensable persons or things

noyau, noyau atomique

the positively charged dense center of an atom

noyau, nucleus

any histologically identifiable mass of neural cell bodies in the brain or spinal cord

noyau, noyau central

the central structure of the lens that is surrounded by the cortex

noyau

the central core of a comet, which is composed of ice, dust, and rocky materials

Example

The nucleus of Comet Hale-Bopp is believed to be several kilometers in diameter.

The nucleus of a comet contains volatile substances that vaporize when the comet approaches the Sun, creating its characteristic tail.

The nucleus of Comet Halley is thought to be a mixture of water ice, carbon dioxide ice, and various organic compounds.

noyau, nucleus

the central and typically sonorous part of a syllable, usually occupied by a vowel or a vowel-like sound

What is a "nucleus"?

A nucleus is the central part of a syllable, usually consisting of a vowel sound. It serves as the core around which the rest of the syllable is built, and it is essential for the syllable's structure. For example, in the word "cat," the nucleus is the "a" sound, while in "beat," the nucleus is the "ea" sound. The nucleus is important in phonetics because it contributes to the overall sound and rhythm of speech, playing a key role in how syllables are formed and how words are pronounced in various languages.