artritis reumatoide

Inflammation of a joint. Caused by abnormal stress on a normal joint, or by normal stress on an abnormal joint. Polyarthritis is immune mediated, and is arthritis in multiple ...

núcleo del átomo

Biologia; Biologia Komórki

An atom's core; contains protons and one or more neutrons (except hydrogen, which has no neutrons).

número atómico

Biologia; Biologia Komórki

The number of protons in the nucleus of an atom.

asma

Biologia; Biologia Komórki

A respiratory disorder caused by allergies that constrict the bronchioles by inducing spasms in the muscles surrounding the lungs, by causing the bronchioles to swell, or by ...

ascomicetos

Biologia; Biologia Komórki

Division of fungi that contains the yeasts and morels; ascomycetes produce an ascus (or sac) in which ascospores are produced.

selección artificial

Biologia; Biologia Komórki

The process in which breeders choose the variants to be used to produce succeeding generations.

reproducción asexual

Biologia; Biologia Komórki

A method of reproduction in which genetically identical offspring are produced from a single parent; occurs by many mechanisms, including fission, budding, and fragmentation.