NIH MeSH · D000042Phenomena and Processes

Absorption

Definition

The physical or physiological processes by which substances, tissue, cells, etc. take up or take in other substances or energy.

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Absorption, Physicochemical

The physical process of passing into, or being taken up or taken in by a substance.

Adsorption

The adhesion of gases, liquids, or dissolved solids onto a surface. It includes adsorptive phenomena of bacteria and viruses onto surfaces a…

Alpha Particles

Positively charged particles composed of two protons and two NEUTRONS, i.e. equivalent to HELIUM nuclei, which are emitted during disintegra…

Anisotropy

A physical property showing different values in relation to the direction in or along which the measurement is made. The physical property m…

Astronomical Objects

Aggregates of matter in outer space.

Astronomical Phenomena

Aggregates of matter in outer space, such as stars, planets, and comets; their properties; and the processes they undergo.

Avalanches

Mass of snow and/or ice falling down a mountain or incline.

Background Radiation

Radiation from sources other than the source of interest. It is due to cosmic rays and natural radioactivity in the environment.

Source: NIH MeSH 2026 (D000042) — National Library of Medicine, public domain. View official MeSH record ↗