núcleos

Núcleos is the plural of núcleo in Spanish and Portuguese. In scientific usage, the term denotes the central or essential part of a system or object.

In biology, the cell nucleus is a membrane-bound organelle that houses DNA. It controls gene expression and DNA replication. The nuclear envelope regulates traffic with the cytoplasm through nuclear pores, and the nucleolus synthesizes ribosomal RNA.

In physics, the atomic nucleus is the dense center of an atom, composed of protons and neutrons. Protons determine the element; neutrons affect mass and stability. Nuclei undergo binding, decay, fusion, or fission, producing isotopes.

In astronomy, the galactic nucleus is the central region of a galaxy, often containing a supermassive black hole. It can emit across the spectrum, and active nuclei drive strong radiation and jets.

In linguistics, the nucleus of a syllable is its most sonorous element, usually a vowel. Some languages allow syllabic consonants as nuclei, but vowels are the common case.

In neuroanatomy, nuclei are discrete groups of neuron cell bodies within the brain and brainstem. They form functional units, such as the basal ganglia nuclei, which participate in motor control and other processes.